WorldWideScience

Sample records for high-voltage power supplies

  1. High voltage power supply

    Science.gov (United States)

    Ruitberg, A. P.; Young, K. M. (inventors)

    1985-01-01

    A high voltage power supply is formed by three discrete circuits energized by a battery to provide a plurality of concurrent output signals floating at a high output voltage on the order of several tens of kilovolts. In the first two circuits, the regulator stages are pulse width modulated and include adjustable ressistances for varying the duty cycles of pulse trains provided to corresponding oscillator stages while the third regulator stage includes an adjustable resistance for varying the amplitude of a steady signal provided to a third oscillator stage. In the first circuit, the oscillator, formed by a constant current drive network and a tuned resonant network included a step up transformer, is coupled to a second step up transformer which, in turn, supplies an amplified sinusoidal signal to a parallel pair of complementary poled rectifying, voltage multiplier stages to generate the high output voltage.

  2. Improved Programmable High-Voltage Power Supply

    Science.gov (United States)

    Castell, Karen; Rutberg, Arthur

    1994-01-01

    Improved dc-to-dc converter functions as programmable high-voltage power supply with low-power-dissipation voltage regulator on high-voltage side. Design of power supply overcomes deficiencies of older designs. Voltage regulation with low power dissipation provided on high-voltage side.

  3. Spacecraft high-voltage power supply construction

    Science.gov (United States)

    Sutton, J. F.; Stern, J. E.

    1975-01-01

    The design techniques, circuit components, fabrication techniques, and past experience used in successful high-voltage power supplies for spacecraft flight systems are described. A discussion of the basic physics of electrical discharges in gases is included and a design rationale for the prevention of electrical discharges is provided. Also included are typical examples of proven spacecraft high-voltage power supplies with typical specifications for design, fabrication, and testing.

  4. Development of high voltage power supply

    International Nuclear Information System (INIS)

    This paper describes a high voltage power supply developed at the Nuclear Science Centre that is suitable for use in electrostatic quadrupoles, electrostatic steerers, time of flight mass spectrometers etc. The power supply is capable of supplying 4 mA at 4 kV (or 1 mA at 10 kV) with low ripples and high stability. The ability to control the supply remotely makes it specially suitable for accelerator applications. (author)

  5. Development of new high voltage power supplies

    International Nuclear Information System (INIS)

    The author introduces a series of high voltage power supplies of PWM-ZVS half-bridge converter, which is successfully employed in H- ion source and injection system. The structure of function block and module integration has upgraded its technical specifications

  6. SMPS type high voltage regulated D.C. power supply

    International Nuclear Information System (INIS)

    DC regulated power supplies find extensive use in accelerator laboratories. High Voltage DC (HVDC) power supplies are used in inflector, deflector, extractor, etc. for Cyclotrons. besides their use for insulation testing of high voltage cables and other materials. The paper describes the development of a DC regulated switching mode type high voltage power supply. The salient design features are briefly reported. (author)

  7. Pulsed high voltage extraction power supply

    International Nuclear Information System (INIS)

    The basic idea was to obtain a pulsed power supply up to 4 kV designated to extract the microwave from a usual magnetron. The magnetron used is a home appliance device from a microwave oven. The output power generally ranges from 200 to 800 watts, the power rate being controlled by a timer device. Practically the magnetron works at a constant filament voltage and a fixed extraction high voltage the last one being switched on/off on a pre-programmed scheme. The on/off time laps are ranging from tens seconds to few minutes. The magnetron used in our ECR ion source has a different way to furnish a lower microwave energy into the ionization chamber. The microwave energy required for the ECR ion source is much smaller ranging from 20 watts to a maximum of 100 watts. The volume of the chamber is very small and there are not possibilities for exhausting large amounts of heat. For this reason the high voltage is applied by means of a chopping device operating at 50 Hz frequency (the AC frequency). For a very few milliseconds the high voltage is turned on every period of the sinusoidal voltage. In this way the energy injected into the ion chamber is reduced to acceptable values. The only problem that occurs is the fact that this periodicity of microwave generation is found also into the extracted ion beam; the beam is obtained at a 50 Hz frequency in very intense thin pulses with a few milliseconds width. As we discussed in a previous paper we are mainly concerned with the timpaper we are mainly concerned with the time of flight RBS. From this point of view the obtained beam pulses are much to rare and wide. The electronic scheme proposed consists of a resonant circuitry working at 1.5 kHz frequency; a thyristor trigger device the pulses of which are less than 200 nsec wide. Three resonant cells are summed together to obtain 4000 V, enough to extract thin microwave pulses. The driving power supply for the three resonant cells is a DC 200 V. The next step was to inject the pulsed microwaves into the ECR ionization chamber. We have monitored the beam after 500 KV acceleration and detected it by means of a photomultiplier with a plastic detector on the top. The resulted ion beam pulses for protons and helium ions are very satisfactory showing a pulsed beam at 1.5 kHz with narrow particle bunches. The work is now in progress, and the goal is to narrow as much as possible the beam pulses. (authors)

  8. Modular high voltage power supply for chemical analysis

    Science.gov (United States)

    Stamps, James F. (Livermore, CA); Yee, Daniel D. (Dublin, CA)

    2010-05-04

    A high voltage power supply for use in a system such as a microfluidics system, uses a DC-DC converter in parallel with a voltage-controlled resistor. A feedback circuit provides a control signal for the DC-DC converter and voltage-controlled resistor so as to regulate the output voltage of the high voltage power supply, as well as, to sink or source current from the high voltage supply.

  9. Conceptual definition of a high voltage power supply test facility

    Science.gov (United States)

    Biess, John J.; Chu, Teh-Ming; Stevens, N. John

    1989-01-01

    NASA Lewis Research Center is presently developing a 60 GHz traveling wave tube for satellite cross-link communications. The operating voltage for this new tube is - 20 kV. There is concern about the high voltage insulation system and NASA is planning a space station high voltage experiment that will demonstrate both the 60 GHz communications and high voltage electronics technology. The experiment interfaces, requirements, conceptual design, technology issues and safety issues are determined. A block diagram of the high voltage power supply test facility was generated. It includes the high voltage power supply, the 60 GHz traveling wave tube, the communications package, the antenna package, a high voltage diagnostics package and a command and data processor system. The interfaces with the space station and the attached payload accommodations equipment were determined. A brief description of the different subsystems and a discussion of the technology development needs are presented.

  10. High-voltage power supply based on piezoelectric transformer

    OpenAIRE

    Kryvoshei, Dmytro; Paerand, Yuriy

    2012-01-01

    High-voltage power supply based on piezoelectric transformer instead of traditional electromagnetic transformer is offered in the paper. The structure of the power supply is represented. The power supply operation principle is described, the diagrams that illustrate its operation are given.

  11. High current and high voltage power supplies for accelerators

    International Nuclear Information System (INIS)

    High voltage (HV) high current regulated DC power supplies are key components to accelerators using electrostatic or RF acceleration. HVDC power supplies used for biasing high power vacuum tubes in research demands continuous duty operation with good stability. In addition to regulation and ripple specifications these power supplies should have few mS order settling time and few ?S, order turn OFF time. Use of intelligent control methods along with efficient power semiconductors (like, Insulated Gate Bipolar Transistor: IGBT) has enabled development of these power converters. Various topologies of controlled HVDC power supplies are discussed and future prospects are examined here. (author)

  12. Programmable high voltage power supply with regulation confined to the high voltage section

    Science.gov (United States)

    Castell, Karen D. (inventor); Ruitberg, Arthur P. (inventor)

    1994-01-01

    A high voltage power supply in a dc-dc converter configuration includes a pre-regulator which filters and regulates the dc input and drives an oscillator which applies, in turn, a low voltage ac signal to the low side of a step-up high voltage transformer. The high voltage side of the transformer drives a voltage multiplier which provides a stepped up dc voltage to an output filter. The output voltage is sensed by a feedback network which then controls a regulator. Both the input and output of the regulator are on the high voltage side, avoiding isolation problems. The regulator furnishes a portion of the drive to the voltage multiplier, avoiding having a regulator in series with the load with its attendant, relatively high power losses. This power supply is highly regulated, has low power consumption, a low parts count and may be manufactured at low cost. The power supply has a programmability feature that allows for the selection of a large range of output voltages.

  13. E-beam high voltage switching power supply

    Science.gov (United States)

    Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

    1996-01-01

    A high-power power supply produces a controllable, constant high voltage put under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

  14. A New Transformer for High Voltage Charging Power Supply

    Directory of Open Access Journals (Sweden)

    Jianming Liu

    2013-09-01

    Full Text Available In this paper, the authers present a new high-frequency transformer for high-voltage capacitor charging power supply. They also establish a new topology structure and the charging control strategy for the charging power supply. The effects of leakage inductance and distributed capacitance by using the soft switching in the transformer were then analyzed. Finally, the different leakage inductances in the two transformers were tested. The results of the above study provide a theoratical basis for the application of the new high frequency transformer in pulsed power supply.  

  15. High voltage power supplies for INDUS-2 RF system

    International Nuclear Information System (INIS)

    The RF system of Indus-2 employs klystron amplifiers operating at 505.812 MHz. A precession controlled high voltage DC supply of appropriate rating is needed for each klystron amplifier, as its bias supply. Since internal flashover and arcing are common with the operation of these klystrons and stored energies beyond particular limit inside its bias power supply is detrimental to this device, a properly designed crowbar is incorporated between each klystron and its power supply. This crowbar bypass these stored energies and helps protecting klystron under any of these unfavorable conditions. In either case, power supply sees a near short circuit across its load. So, its power circuit is designed to reduce the fault current level and its various components are also designed to withstand these fault currents, as and when it appears. Finally, operation of these high voltage power supplies (HVPS) generates lot of harmonics on the source side, which distort the input waveform substantially and reduces the input power factor also. Source multiplication between two power supplies are planned to improve upon above parameters and suitable detuned line filters are incorporated to keep the input voltage total harmonics distortion (THD) below 5 % and input power factor (IFF) near unity. (author)

  16. Test wire for high voltage power supply crowbar system

    International Nuclear Information System (INIS)

    The klystron microwave amplifier tubes used in the Low Energy Demonstration Accelerator (LEDA) and to be used in the Accelerator Production of Tritium (APT) plant have a strict upper limit on the amount of energy which can be safely dissipated within the klystron's vacuum envelope during a high voltage arc. One way to prevent damage from occurring to the klystron microwave amplifier tube is through the use of a crowbar circuit which diverts the energy stored in the power supply filter capacitors from the tube arc. The crowbar circuit must be extremely reliable. To test the crowbar circuit, a wire that is designed to fuse when it absorbs a predetermined amount of energy is switched between the high voltage output terminals. The energy required to fuse the wire was investigated for a variety of circuits that simulated the power supply circuit. Techniques for calculating wire length and energy are presented along with verifying experimental data

  17. Development of High Voltage Power Supply for a Photomultiplier

    OpenAIRE

    Virta, Vihtori

    2013-01-01

    Abstract The purpose of this thesis was to develop a 4-channel high voltage power supply for powering Hamamatsu SL10 photomultiplier tubes in the iTop detector. The iTop detector is part of the Belle 2 detector and it is made for detecting Kaons and Pions (K/?). The Belle 2 detector is made for detecting charged particle violations in the Super KEKB particle accelerator which is located in Tsukuba, Japan. The Super KEKB particle accelerator research project belongs to the KEK High Energy...

  18. High-Voltage Power Supply System for Laser Isotope Separation

    International Nuclear Information System (INIS)

    This report presents several concepts for Laser High-Voltage Power Supply (HVPS) Systems for a Laser Isotope Separation facility. Selection of equipments and their arrangement into operational systems is based on proven designs and on application concepts now being developed. This report has identified a number of alternative system arrangements and has provided preliminary cost estimates for each. The report includes a recommendation for follow-on studies that will further define the optimum Laser HVPS Systems. Brief descriptions are given of Modulator/Regulator circuit trade-offs, system control interfaces, and their impact on costs

  19. E-beam high voltage switching power supply

    Science.gov (United States)

    Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

    1997-01-01

    A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360.degree./n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load.

  20. E-beam high voltage switching power supply

    International Nuclear Information System (INIS)

    A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360 degree/n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into anred energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load. 7 figs

  1. Solid-state high voltage modulator and its application to rf source high voltage power supplies

    International Nuclear Information System (INIS)

    A solid-state high voltage modulator is described in which series-connected insulated-gate bipolar transistors (IGBTs) are switched at a fixed frequency by a pulse width modulation (PWM) regulator, that adjusts the pulse width to control the voltage out of an inductor-capacitor filter network. General Atomics proposed the HV power supply (HVPS) topology of multiple IGBT modulators connected to a common HVdc source for the large number of 1 MW klystrons in the linear accelerator of the Accelerator Production of Tritium project. The switching of 24 IGBTs to obtain 20 kVdc at 20 A for short pulses was successfully demonstrated. This effort was incorporated into the design of a -70 kV, 80 A, IGBT modulator, and in a short-pulse test 12 IGBTs regulated -5 kV at 50 A under PWM control. These two tests confirm the practicality of solid-state IGBT modulators to regulate high voltage at reasonable currents. Tokamaks such as ITER require large rf heating and current drive systems with multiple rf sources. A HVPS topology is presented that readily adapts to the three rf heating systems on ITER. To take advantage of the known economy of scale for power conversion equipment, a single HVdc source feeds multiple rf sources. The large power conversion equipment, which is located outside, converts the incoming utility line voltage directly to the HVdc needed for the class of rf sources connected to it, to further reduce cost. The HVdc feeds a set of IGBT modulators, one for each rf soset of IGBT modulators, one for each rf source, to independently control the voltage applied to each source, maximizing operational flexibility. Only the modulators are indoors, close to the rf sources, minimizing the use of costly near-tokamak floor space.

  2. High Voltage Power Supply Design Guide for Space

    Science.gov (United States)

    Bever, Renate S.; Ruitberg, Arthur P.; Kellenbenz, Carl W.; Irish, Sandra M.

    2006-01-01

    This book is written for newcomers to the topic of high voltage (HV) in space and is intended to replace an earlier (1970s) out-of-print document. It discusses the designs, problems, and their solutions for HV, mostly direct current, electric power, or bias supplies that are needed for space scientific instruments and devices, including stepping supplies. Output voltages up to 30kV are considered, but only very low output currents, on the order of microamperes. The book gives a brief review of the basic physics of electrical insulation and breakdown problems, especially in gases. It recites details about embedment and coating of the supplies with polymeric resins. Suggestions on HV circuit parts follow. Corona or partial discharge testing on the HV parts and assemblies is discussed both under AC and DC impressed test voltages. Electric field analysis by computer on an HV device is included in considerable detail. Finally, there are many examples given of HV power supplies, complete with some of the circuit diagrams and color photographs of the layouts.

  3. High voltage power supply with modular series resonant inverters

    Science.gov (United States)

    Dreifuerst, Gary R. (Livermore, CA); Merritt, Bernard T. (Livermore, CA)

    1995-01-01

    A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360.degree./n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply. Where it is desired to make electrical isolation breaks, tubes comprised of insulating material such as nylon are used to provide insulation and continue the fluid circuit.

  4. Study of a High Voltage Ion Engine Power Supply

    Science.gov (United States)

    Stuart, Thomas A.; King, Roger J.; Mayer, Eric

    1996-01-01

    A complete laboratory breadboard version of a ion engine power converter was built and tested. This prototype operated on a line voltage of 80-120 Vdc, and provided output ratings of 1100 V at 1.8 kW, and 250 V at 20 mA. The high-voltage (HV) output voltage rating was revised from the original value of 1350 V at the beginning of the project. The LV output was designed to hold up during a 1-A surge current lasting up to 1 second. The prototype power converter included a internal housekeeping power supply which also operated from the line input. The power consumed in housekeeping was included in the overall energy budget presented for the ion engine converter. HV and LV output voltage setpoints were commanded through potentiometers. The HV converter itself reached its highest power efficiency of slightly over 93% at low line and maximum output. This would dip below 90% at high line. The no-load (rated output voltages, zero load current) power consumption of the entire system was less than 13 W. A careful loss breakdown shows that converter losses are predominately Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) conduction losses and HV rectifier snubbing losses, with the rectifier snubbing losses becoming predominant at high line. This suggests that further improvements in power efficiency could best be obtained by either developing a rectifier that was adequately protected against voltage overshoot with less snubbing, or by developing a pre-regulator to reduced the range of line voltage on the converter. The transient testing showed the converter to be fully protected against load faults, including a direct short-circuit from the HV output to the LV output terminals. Two currents sensors were used: one to directly detect any core ratcheting on the output transformer and re-initiate a soft start, and the other to directly detect a load fault and quickly shut down the converter for load protection. The finished converter has been extensively fault tested without failure. The finished converter has been packaged suitable for use as a laboratory prototype for further testing. The finished converter is readily transportable. An article on design issues for high voltage converters for ion engines is included as an attachement.

  5. Unique Power Dense, Configurable, Robust, High-Voltage Power Supplies Project

    National Aeronautics and Space Administration — Princeton Power will develop and deliver three small, lightweight 50 W high-voltage power supplies that have a configurable output voltage range from 500 to 50...

  6. Low power, high voltage power supply with fast rise/fall time

    Science.gov (United States)

    Bearden, Douglas B. (Inventor)

    2007-01-01

    A low power, high voltage power supply system includes a high voltage power supply stage and a preregulator for programming the power supply stage so as to produce an output voltage which is a predetermined fraction of a desired voltage level. The power supply stage includes a high voltage, voltage doubler stage connected to receive the output voltage from the preregulator and for, when activated, providing amplification of the output voltage to the desired voltage level. A first feedback loop is connected between the output of the preregulator and an input of the preregulator while a second feedback loop is connected between the output of the power supply stage and the input of the preregulator.

  7. A high voltage power supply for the AE-C and D low energy electron experiment

    Science.gov (United States)

    Gillis, J. A.

    1974-01-01

    A description is given of the electrical and mechanical design and operation of high voltage power supplies for space flight use. The supply was used to generate the spiraltron high voltage for low energy electron experiment on AE-C and D. Two versions of the supply were designed and built; one design is referred to as the low power version (AE-C) and the other as the high power version (AE-D). Performance is discussed under all operating conditions.

  8. Design of Plasma Generator Driven by High-frequency High-voltage Power Supply

    OpenAIRE

    C. Yong-Nong; K. Chih-Ming

    2013-01-01

    In this research, a high-frequency high-voltage power supply designed for plasma generator is presented. The powersupply mainly consists of a series resonant converter with a high-frequency high-voltage boost transformer. Due to theindispensable high-voltage inheritance in the operation of plasma generator, the analysis of transformer needconsidering not only winding resistance, leakage inductance, magnetizing inductance, and core-loss resistance, butalso parasitic capacitance resulted from t...

  9. The design and development of a high voltage power supply

    Science.gov (United States)

    Ting, R.

    1974-01-01

    A high voltage circuit system was redesigned, breadboarded, and tested to meet revised specification requirements. Circuit component subassemblies are described and include the firing unit, regulator, dc to dc converter, and output and trigger circuits. Design changes, tests, and equipment fabrication are outlined chronologically by month. A list of design specifications is included.

  10. Intermodulation components in the transmitter RF output due to high voltage power supply ripple

    Science.gov (United States)

    Finnegan, E. J.

    1977-01-01

    The economic feasibility of eliminating the 400-Hz motor-generator sets used to provide power to the high-voltage power supplies of the 20-kW transmitters and replace them with a 60-Hz high-voltage power supply was investigated. The efficiency of a power supply that runs from the 60-Hz line directly would pay for itself in about seven years and could be designed so that the transmitter would meet all the incidental phase and amplitude modulation specifications.

  11. Piezoelectric transformer and modular connections for high power and high voltage power supplies

    Science.gov (United States)

    Vazquez Carazo, Alfredo (Inventor)

    2006-01-01

    A modular design for combining piezoelectric transformers is provided for high voltage and high power conversion applications. The input portions of individual piezoelectric transformers are driven for a single power supply. This created the vibration and the conversion of electrical to electrical energy from the input to the output of the transformers. The output portions of the single piezoelectric transformers are combining in series and/or parallel to provide multiple outputs having different rating of voltage and current.

  12. Design of Plasma Generator Driven by High-frequency High-voltage Power Supply

    Scientific Electronic Library Online (English)

    C., Yong-Nong; K., Chih-Ming.

    2013-04-01

    Full Text Available In this research, a high-frequency high-voltage power supply designed for plasma generator is presented. The power supply mainly consists of a series resonant converter with a high-frequency high-voltage boost transformer. Due to the indispensable high-voltage inheritance in the operation of plasma [...] generator, the analysis of transformer need considering not only winding resistance, leakage inductance, magnetizing inductance, and core-loss resistance, but also parasitic capacitance resulted from the insulation wrappings on the high-voltage side. This research exhibits a simple approach to measuring equivalent circuit parameters of the high-frequency, high-voltage transformer with stray capacitance being introduced into the conventional modeling. The proposed modeling scheme provides not only a precise measurement procedure but also effective design information for series-load resonant converter. The plasma discharging plate is designed as part of the electric circuit in the series load-resonant converter and the circuit model of the plasma discharging plate is also conducted as well. Thus, the overall model of the high-voltage plasma generator is built and the designing procedures for appropriate selections of the corresponding resonant-circuit parameters can be established. Finally, a high-voltage plasma generator with 220V, 60Hz, and 1kW input, along with a 22 kHz and over 8kV output, is realized and implemented.

  13. A high voltage DC switching power supply of corona discharge for ozone tube

    International Nuclear Information System (INIS)

    Full text: This paper presents a study of design and construction of a high voltage DC switching power supply for corona generating of ozone gas generating. This supply uses fly back converter at 3 k Vdc 30 khz and controls its operation using PWM techniques. I C TL494 is controlled of the switching. The testing of supply by putting high voltage to ozone gas tube at one-hour, the oxygen quantity 21 % of air, which ozone tube model enables ozone gas generating capacity of 95.2 mgO3/hr

  14. Development of compact high voltage switched mode power supply for microwave plasma sources supply for low pressure plasma

    International Nuclear Information System (INIS)

    Although microwave induced plasmas are well known as high efficiency plasma sources, their uses in laboratories are limited since the microwave power systems are complicated and expensive. The output power of commercially available low-cost microwave ovens is fixed and discontinuous resulting from the high voltage doubler topology of the magnetron tube power supply. In this paper, a high voltage switched mode power supply of forward topology has been developed for continuous microwave power radiation. The forward converter can generate a no-load high voltage output maximum of 7 kV. When driving the magnetron tube, the microwave output power could be varied from 0 to 35 W while the high voltage output level was constantly regulated at -3.4 kV. A microwave induced plasma system was setup to investigate the plasma produced. A low pressure argon plasma was produced with only 2 W over a wide range of pressures.

  15. Design of Plasma Generator Driven by High-frequency High-voltage Power Supply

    Directory of Open Access Journals (Sweden)

    C. Yong-Nong

    2013-03-01

    Full Text Available In this research, a high-frequency high-voltage power supply designed for plasma generator is presented. The powersupply mainly consists of a series resonant converter with a high-frequency high-voltage boost transformer. Due to theindispensable high-voltage inheritance in the operation of plasma generator, the analysis of transformer needconsidering not only winding resistance, leakage inductance, magnetizing inductance, and core-loss resistance, butalso parasitic capacitance resulted from the insulation wrappings on the high-voltage side. This research exhibits asimple approach to measuring equivalent circuit parameters of the high-frequency, high-voltage transformer with straycapacitance being introduced into the conventional modeling. The proposed modeling scheme provides not only aprecise measurement procedure but also effective design information for series-load resonant converter. The plasmadischarging plate is designed as part of the electric circuit in the series load-resonant converter and the circuit modelof the plasma discharging plate is also conducted as well. Thus, the overall model of the high-voltage plasmagenerator is built and the designing procedures for appropriate selections of the corresponding resonant-circuitparameters can be established. Finally, a high-voltage plasma generator with 220V, 60Hz, and 1kW input, along witha 22 kHz and over 8kV output, is realized and implemented.

  16. Power Supply, Energy Storage Line, and Grid Pulsers for High Voltage Gridded Klystrons

    Science.gov (United States)

    Koontz, Roland F.

    2002-08-01

    Designs for high power, gridded klystrons are being considered for driving accelerators. These designs have high voltage DC on the klystron cathodes, with the klystron current being turned on and off with a much lower voltage grid drive pulse. Such a klystron eliminates the need for a high power pulse modulator. The modulator is replaced by a high voltage energy storage line, an RF switching line charging supply, and a small electronics package consisting of a DC grid bias supply, a fast rise and fall time grid pulser, and a klystron cathode heater power supply. This paper outlines some of the design details of such a gridded klystron support system including specifications for the energy storage cable, and the fast grid pulse driver. Such a system can be very compact and reliable with low initial cost, and excellent operating efficiency.

  17. Design of high voltage DC power supply based on LCC resonant converter

    Science.gov (United States)

    Wang, Z. Q.; Liu, Z. G.; Wang, J. J.; Li, G. F.

    2013-03-01

    The aim of this paper is to design a small size, light weight high frequency high voltage (HFHV) power supply. It presents a comprehensive procedure for designing a high output voltage power supply based on series-parallel (LCC) resonant converter, aiming to realize the soft-switching. Through mathematical calculation based on an extensive of the first harmonic analysis, the paper derives the approach of determining the resonant parameters of the LCC converter. Then, a 35 kV power supply featuring a series-parallel resonant converter topology to compensate the distributed parameter is built to verify the correctness of the theory.

  18. Design of high voltage DC power supply based on LCC resonant converter

    International Nuclear Information System (INIS)

    The aim of this paper is to design a small size, light weight high frequency high voltage (HFHV) power supply. It presents a comprehensive procedure for designing a high output voltage power supply based on series-parallel (LCC) resonant converter, aiming to realize the soft-switching. Through mathematical calculation based on an extensive of the first harmonic analysis, the paper derives the approach of determining the resonant parameters of the LCC converter. Then, a 35 kV power supply featuring a series-parallel resonant converter topology to compensate the distributed parameter is built to verify the correctness of the theory.

  19. A new VME-based high voltage power supply for large photomultiplier systems

    International Nuclear Information System (INIS)

    We describe a new high voltage power supply, developed for the leadglass calorimeter of the WA98 experiment at CERN. The high voltage is produced for each of the 10 080 photomultiplier tubes of the detector individually, by the same number of active bases with on-board Greinacher voltage multipliers. The full VME-based HV controller system, which addresses each base via bus cables once per second, is miniaturized and fits into a single VME crate. The main advantages of this approach are the low heat dissipation, the considerably reduced amount of cabling and cost, as well as the high stability and low noise of the system. (orig.)

  20. Design and development of prototype high voltage power supply with PSM technique for RF amplifier

    International Nuclear Information System (INIS)

    The prototype high voltage power supply with Pulse Step Modulation (PSM) technique is designed and developed for RF amplifier. The power supply consists of several switching power modules connected in series through freewheeling diodes. Each power module is phase shifted from others and the total output voltage is obtained by modulating their delay between on time and pulse width resulting in higher ripple frequency at output stage. A floating point Digital Signal Processor (DSP) based controller TMS320F28335 manufactured by Texas Instruments is used for the implementation of digital control algorithm. This paper discusses PSM technology, control algorithm, experimental results and simulation results showing the expected performance of the system. (author)

  1. Design and realization of the control system of the auxiliary heating high-voltage power supply on HL-2A

    International Nuclear Information System (INIS)

    The AC regulated high-voltage power supply and the neutral point control high-voltage power supply are designed for LHCD and ECRH. The high-voltage pulse modulators are used in these power supplies. The wave head compensation, the feed forward control and the feedback control methods are adopted to compensate the dynamic characteristic fault of the power supply and the output voltage instability of the generators. The stability of output voltage is better than 1%. The main circuit and the control system are described. Good controlling properties and reliable protective properties of the control system are proven by the experiment results. (authors)

  2. Optimization of a high voltage power supply for a nitrogen laser

    International Nuclear Information System (INIS)

    In the present paper the optimization of a high voltage switching power supply for a compact TEA nitrogen laser is described. Taking as criterion the recovering of the charging voltage in a 95% of the maximal voltage, the relationships between the recovering rate coefficient, the recovering time and the maximal repetition frequency were obtained. Using an experimental set-up the power supply optimal values of turns in the primary transformer coil Np=35 and excitation pulse frequency fexc=25.5 kHz was determined

  3. High voltage power supply for the inflector of K-500 superconducting cyclotron

    International Nuclear Information System (INIS)

    A spiral inflector, consisting of two electrodes, is used in K-500 superconducting cyclotron at VECC for ion bending from axial to median plane. The front grid electrode allows the beam to enter the electric field and the back electrode bent the ion by applying the required voltage. High voltage inflector power supply system which consists of two power supplies (+10 KV/1mA and -10KV/1mA) has been designed and developed for providing these voltages across electrodes of inflector. This system also contain faraday cup unit for measuring current passing through inflector. (author)

  4. Ultra-long-pulse microwave negative high voltage power supply with fast protection

    International Nuclear Information System (INIS)

    Two 1.4 MW high voltage power supply (HVPS) modules with 3-5 s pulse duration have been developed for LHCD experiment in the HT-7 tokamak. The power source consists of a pulsed generator and the electric circuit. Duration of the ultra-long-pulse is controlled by switching-on dc relay immediately and switching-off ac contactor after a given time, and the fast protection is executed by a crowbar. Due to the soft starting of the power source, the problem of overvoltage induced by dc relay switching-on has been solved. Each power supply module outputs a rated power (-35 kV, 40 A) on the dummy load. With the klystrons connected as the load of the power supply modules, LHCD experiments have been conducted successfully in the HT-7 tokamak

  5. Study on the characters of high voltage charging power supply system for diagnostics neutral beam on HT-7 Tokamak

    International Nuclear Information System (INIS)

    A high voltage power supply system has been developed for the diagnostic neutral beam on the HT-7 experimental Tokamak, and the over-voltage phenomenon of storage capacitor was founded in the experiment. In order to analyse and resolve this problem, the structure and principle of high voltage power supply is described and the primary high voltage charging power supply system is introduced in detail. The phenomenon of over-voltage on the capacitors is also studied with circuit model, and the conclusion is obtained that the leakage inductance is the mA in reason which causes the over-voltage on the capacitors. (authors)

  6. Control system of high voltage power supply of 3 MeV DC accelerator

    International Nuclear Information System (INIS)

    A 3 MeV, 10 mA electron beam dc accelerator is being developed at EBC, Kharghar, Navi Mumbai. The 3 MV high voltage system of the accelerator consists of 10 kV/10 A DC power supply, 50 kW/120 kHz push- pull oscillator, 300 kV tuned air-core step-up transformer, 3 MV/10 mA multiplier column and cooling systems. The high voltage power supply requires a control system for its safe operation under stringent conditions of high electrical surges and electromagnetic interferences. A control system is developed for operation and protection of this high voltage system. Various functional safety and protection features are incorporated in this system. Salient features of this control system are; (i) Independent Alarm and trip setting for each signal as per desired levels, (ii) Analog displays for qualitative and digital display for precise measurements, (iii) Fault display on annunciation panel, (iv) Electrical isolations for each signal from one another and (v) better EMI compatibility. The control system is already commissioned and tested. This paper describes about the design philosophy and salient features of this control system

  7. Measurement system for high voltage pulse power supply on HL-2A

    International Nuclear Information System (INIS)

    A measurement system for the high voltage pulse power supply on HL-2A has been developed. It adopts the voltage divider based on high-frequency inductance-free glaze film resistor along with the fiber isolation technology based on voltage-frequency conversion. Moreover, a DSP chip is used in the fiber transmission, to realize A/D conversion, simplifying the circuit, enhancing the data transmission speed and anti-jamming ability of the system. The system has been applied to long-pulse (5 s) discharge experiments on HL-2A. The experimental results show that, the system realizes the potential isolation for power supply, and the measured voltage waveforms reflect the supply output faithfully, providing real-time voltage data for the feedback and protection system of the supply. (authors)

  8. A high voltage pulse power supply for metal plasma immersion ion implantation and deposition.

    Science.gov (United States)

    Salvadori, M C; Teixeira, F S; Araújo, W W R; Sgubin, L G; Sochugov, N S; Spirin, R E; Brown, I G

    2010-12-01

    We describe the design and implementation of a high voltage pulse power supply (pulser) that supports the operation of a repetitively pulsed filtered vacuum arc plasma deposition facility in plasma immersion ion implantation and deposition (Mepiiid) mode. Negative pulses (micropulses) of up to 20 kV in magnitude and 20 A peak current are provided in gated pulse packets (macropulses) over a broad range of possible pulse width and duty cycle. Application of the system consisting of filtered vacuum arc and high voltage pulser is demonstrated by forming diamond-like carbon (DLC) thin films with and without substrate bias provided by the pulser. Significantly enhanced film?substrate adhesion is observed when the pulser is used to induce interface mixing between the DLC film and the underlying Si substrate. PMID:21198040

  9. A high voltage pulse power supply for metal plasma immersion ion implantation and deposition

    International Nuclear Information System (INIS)

    We describe the design and implementation of a high voltage pulse power supply (pulser) that supports the operation of a repetitively pulsed filtered vacuum arc plasma deposition facility in plasma immersion ion implantation and deposition (Mepiiid) mode. Negative pulses (micropulses) of up to 20 kV in magnitude and 20 A peak current are provided in gated pulse packets (macropulses) over a broad range of possible pulse width and duty cycle. Application of the system consisting of filtered vacuum arc and high voltage pulser is demonstrated by forming diamond-like carbon (DLC) thin films with and without substrate bias provided by the pulser. Significantly enhanced film/substrate adhesion is observed when the pulser is used to induce interface mixing between the DLC film and the underlying Si substrate.

  10. High-Voltage Power Supply With Fast Rise and Fall Times

    Science.gov (United States)

    Bearden, Douglas B.; Acker, Richard M.; Kapuslka, Robert E.

    2007-01-01

    A special-purpose high-voltage power supply can be electronically switched on and off with fast rise and fall times, respectively. The output potential is programmable from 20 to 1,250 V. An output current of 50 A can be sustained at 1,250 V. The power supply was designed specifically for electronically shuttering a microchannel plate in an x-ray detector that must operate with exposure times as short as 1 ms. The basic design of the power supply is also adaptable to other applications in which there are requirements for rapid slewing of high voltages. The power-supply circuitry (see figure) includes a preregulator, which is used to program the output at 1/30 of the desired output potential. After the desired voltage has been set, the outputs of a pulse width modulator (PWM) are enabled and used to amplify the preregulator output potential by 30. The amplification is achieved by use of two voltage doublers with a transformer that has two primary and two secondary windings. A resistor is used to limit the current by controlling the drive voltage of two field-effect transistors (FETs) during turn-on of the PWM. A pulse transformer is used to turn on four FETs to short-circuit four output capacitors when the outputs of the PWM have been disabled. The most notable aspects of the performance of the power supply are a rise time of only 80 s and a fall time of only 60 s at a load current of 50 A or less. Another notable aspect is that the application of a 0-to-5-V square wave to a shutdown pin of the PWM causes the production of a 0-to-1,250-V square wave at the output terminals.

  11. Adaptive control strategy for ECRH negative high-voltage power supply based on CMAC neural network

    International Nuclear Information System (INIS)

    In order to solve the problem that the negative high-voltage power supply in an electron cyclotron resonance heating (ECRH) system can not satisfy the requirements because of the nonlinearity and sensitivity, the direct inverse model control strategy was proposed by using cerebellar model articulation controller(CMAC) for better control, and experiments were carried out to study the system performances with CMAC tracing dynamic signals. The results show that this strategy is strong in self-learning and self-adaptation and easy to be realized. (authors)

  12. Leveraging the LEDA high voltage power supply systems for the LANSCE refurbishment project

    International Nuclear Information System (INIS)

    The LANSCE Refurbishment Project (LANSCE-R) will revitalize the LANSCE accelerator infrastructure. Much of the equipment has been in use for over 39 years and is approaching the end of its design lifetime. As obsolescence issues make like-for-like replacements increasingly more expensive, modern systems with lower costs become a reasonable alternative. As part of the LANSCE-R project, four of the seven HV power supplies for the 805 MHz RF klystrons will be replaced. The present and future requirements for these power supplies influence the selection of replacement options. Details of the HV power supply replacement requirements and the different replacement options will be discussed. One option is to use four 95 kV, 21 A DC power supplies originally installed nearby as part of the Low Energy Demonstration Accelerator (LEDA) project. Significant material and labor cost savings can be achieved by leaving these supplies installed where they are and building a HV transport system to bring high voltage power from the existing LEDA facility to the LANSCE facility. The different replacement options will be compared based on material and labor costs as offset by long-term energy savings.

  13. 100 kV repetition-rate high-voltage pulsed power supply

    International Nuclear Information System (INIS)

    To study the characteristics of gaseous discharge in spark gap, a high-voltage pulsed power supply has been designed, whose output voltage amplitude varies between 30?100 kV and repetition-rate varies from 1 Hz to 5 kHz. Adopting the principle of resonant charging, the power supply transfers energy from the primary source of 10 kV DC to the secondary energy storage capacitor that is charged at least to 18 kV. The hydrogen thyratron conducts under the action of optical trigger signal. Then the current flows through the pulse transformer, and voltage is raises from 18 kV to the peak of 100 kV. The output pulse is a negative voltage one with an pulse width of at least 200 ns. and fall time less than 90 ns. the device can continuously run for no less than 1 min without additional cooling system. (authors)

  14. A regulated high-voltage power supply for ICRH amplifiers in class C operation for ITER

    International Nuclear Information System (INIS)

    The high voltage power supplies for existing ICRH amplifiers are typically thyristor controlled DC-power supplies. For power control, the tube must be operated in class B, leading to a poor efficiency of the system. For existing pulsed systems, the efficiency is not an important aspect, but for a CW-system the power dissipation is an issue for cooling and power cost reasons. For future machines it will also become an important aspect for the break-even point of the machine. In broadcast applications, class C systems are in the meantime used exclusively. The modulation is done by a modulator, for which different systems can be used. Thomcast uses for the modulator their pulse step modulator (PSM) systems which offer many advantages compared to alternative solutions. The paper describes a study for the implementation of a PSM for class C ICRH amplifiers in CW operation. This design is mainly intended for ITER, where for the amplifiers the use of class C operation is planned. The amplifiers are to deliver 2 MW RF-power, which leads to a total power consumption of less than 3 MW including the driver stage. The power is controlled by modulating the final stage anode voltage. The PSM modulator technology must be adopted for the special requirements for these systems. One target in this case was to include the driver stage supply in the PSM. The layout restrictions and safety precautions have to be taken into account as well. (author))

  15. Multiloop Rapid-Rise/Rapid Fall High-Voltage Power Supply

    Science.gov (United States)

    Bearden, Douglas

    2007-01-01

    A proposed multiloop power supply would generate a potential as high as 1.25 kV with rise and fall times power supply would, moreover, be programmable to generate output potentials from 20 to 1,250 V and would be capable of supplying a current of at least 300 A at 1,250 V. This power supply is intended to be a means of electronic shuttering of a microchannel plate that would be used to intensify the output of a charge-coupled-device imager to obtain exposure times as short as 1 ms. The basic design of this power supply could also be adapted to other applications in which high voltages and high slew rates are needed. At the time of reporting the information for this article, there was no commercially available power supply capable of satisfying the stated combination of voltage, rise-time, and fall-time requirements. The power supply would include a preregulator that would be used to program a voltage 1/30 of the desired output voltage. By means of a circuit that would include a pulse-width modulator (PWM), two voltage doublers, and a transformer having two primary and two secondary windings, the preregulator output voltage would be amplified by a factor of 30. A resistor would limit the current by controlling a drive voltage applied to field-effect transistors (FETs) during turn-on of the PWM. Two feedback loops would be used to regulate the high output voltage. A pulse transformer would be used to turn on four FETs to short-circuit output capacitors when the outputs of the PWM were disabled. Application of a 0-to-5-V square to a PWM shut-down pin would cause a 20-to-1,250-V square wave to appear at the output.

  16. Assessment of Electromagnetic Fields around High Voltage Power Supply in Hamadan Hospital Wards

    Directory of Open Access Journals (Sweden)

    Nima Rostampour

    2012-10-01

    Full Text Available Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 Background and Objectives: Biological effects of non-ionizing radiation on the body of living organisms have been studied by researchers in recent years. High Voltage medical equipments are one of the sources generating electromagnetic fields. The electromagnetic field intensity of the medical equipment installed at Hamadan hospitals and the potential hazards were investigated. The main purpose of this study was to determine the intensity of the electromagnetic field around high voltage power supplies in radiology ward of the Hamadan hospitals. Materials and Methods: This was a cross-sectional study and we investigated the electromagnetic fields intensity around high voltage power supplies at Hamadan hospital wards. All measurements were performed using a calibrated Tesla-meter (HI-3603. The measurements were conducted at a range of distances varying from 25 cm to 3 m around the supporting high voltage power supply. Results: We found that the maximum intensity of the magnetic and electric fields at a distance of less than 1 m around the high voltage power supply was 29.625±5.738 mGauss and 25.17±0.92 V/m respectively, which is less than the safe amounts recommended by the ICNIRP for occupational exposure (5000 mG and 10000 V/m and even for public exposure (1000 mG and and 5000 V/m. The minimum intensity of EM fields for a less than 3 m distance was found to be 0.1±0.005 mGauss, which relates to a CT-scanner system installed at Farshchian hospital. Among the whole equipments evaluated in the current survey, the most intense magnetic and electric field was found to be for imaging technician office, which was 3.050±0.004 mGauss and 128.88±0.05 V/m respectively; it is lower than the tolerances recommended by the ICNIRP. Conclusion: According to our results, it seems that the EM field occupational exposure for radiation workers working at Hamadan hospitals does not exceed the tolerances recommended by the ICNIRP. Therefore, we did not find any issue related to the over-irradiation of non-ionizing among the radiologists studied. It is recommended that different brands of generators to be used in order to conduct a detailed and comprehensive study to compare the intensity of the electrical and magnetic fields. st1":*{behavior:url(#ieooui } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;}

  17. High voltage power supplies for ITER RF heating and current drive systems

    International Nuclear Information System (INIS)

    The RF heating and current drive (H and CD) systems to be installed for the ITER fusion machine are the electron cyclotron (EC), ion cyclotron (IC) and, although not in the first phase of the project, lower hybrid (LH). These systems require high voltage, high current power supplies (HVPS) in CW operation. These HVPS should deliver around 50 MW electrical power to each of the RF H and CD systems with stringent requirements in terms of accuracy, voltage ripple, response time, turn off time and fault energy. The PSM (Pulse Step Modulation) technology has demonstrated over the past 20 years its ability to fulfill these requirements in many industrial facilities and other fusion reactors and has therefore been chosen as reference design for the IC and EC HVPS systems. This paper describes the technical specifications, including interfaces, the resulting constraints on the design, the conceptual design proposed for ITER EC and IC HVPS systems and the current status.

  18. A timing detector with pulsed high-voltage power supply for mass measurements at CSRe

    International Nuclear Information System (INIS)

    Accuracy of nuclear mass measurements in storage rings depends critically on the accuracy with which the revolution times of stored ions can be obtained. In such experiments, micro-channel plates (MCP) are used as timing detectors. Due to large phase space of injected secondary beams, a large number of ions cannot be stored in the ring and is lost within the first few revolutions. However, these ions interact with the detector and can saturate the MCP and thus deteriorate its performance. In order to eliminate such effects, a fast, pulsed high-voltage power supply (PHVPS) has been employed which keeps the detector switched-off during the first few revolutions. The new detector setup was taken into operation at the Experimental Cooler-Storage-Ring CSRe in Lanzhou and resulted in a significant improvement of the detector amplitude and efficiency characteristics

  19. A timing detector with pulsed high-voltage power supply for mass measurements at CSRe

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, W. [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Tu, X.L. [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt (Germany); Max Planck Institute for Nuclear Physics, 69117 Heidelberg (Germany); Wang, M., E-mail: wangm@impcas.ac.cn [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Zhang, Y.H. [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Xu, H.S., E-mail: hushan@impcas.ac.cn [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Litvinov, Yu. A. [Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt (Germany); Max Planck Institute for Nuclear Physics, 69117 Heidelberg (Germany); Blaum, K. [Max Planck Institute for Nuclear Physics, 69117 Heidelberg (Germany); and others

    2014-08-01

    Accuracy of nuclear mass measurements in storage rings depends critically on the accuracy with which the revolution times of stored ions can be obtained. In such experiments, micro-channel plates (MCP) are used as timing detectors. Due to large phase space of injected secondary beams, a large number of ions cannot be stored in the ring and is lost within the first few revolutions. However, these ions interact with the detector and can saturate the MCP and thus deteriorate its performance. In order to eliminate such effects, a fast, pulsed high-voltage power supply (PHVPS) has been employed which keeps the detector switched-off during the first few revolutions. The new detector setup was taken into operation at the Experimental Cooler-Storage-Ring CSRe in Lanzhou and resulted in a significant improvement of the detector amplitude and efficiency characteristics.

  20. All solid state high voltage power supply for neutral beam sources

    International Nuclear Information System (INIS)

    The conceptual design of a high frequency solid state, high power, high voltage, power system that reacts fast enough to be compatible with the requirements of a neutral beam source is presented. The system offers the potential of significant advantages over conventional power line frequency systems; such as high reliability, long life, relatively little maintenance requirements, compact size and modular design

  1. The Application of MSVC Reactive Power Compensation Device to the High Voltage Power Supply of Coal Mine

    Directory of Open Access Journals (Sweden)

    Zhenbao Zhu

    2009-02-01

    Full Text Available Through the introduction and technical comparative analysis of the SVC reactive power compensation device of the magnetic controlled reactor (MCR type (it is abbreviated as MSVC, this article measures the working condition of the electrical power distribution system for the Zhaizhen colliery, and confirm the application project of MSVC in the high voltage power supply of Zhaizhen colliery. This device has many obvious advantages such as small output harmonic, low power consumption, maintenance free, simple structure, high reliability, cheap price and small floor area, and it is an ideal dynamic reactive power compensation and voltage regulation device.

  2. Atmospheric pressure plasma jet with high-voltage power supply based on piezoelectric transformer.

    Science.gov (United States)

    Babij, Micha?; Kowalski, Zbigniew W; Nitsch, Karol; Silberring, Jerzy; Gotszalk, Teodor

    2014-05-01

    The dielectric barrier discharge plasma jet, an example of the nonthermal atmospheric pressure plasma jet (APPJ), generates low-temperature plasmas that are suitable for the atomization of volatile species and can also be served as an ionization source for ambient mass and ion mobility spectrometry. A new design of APPJ for mass spectrometry has been built in our group. In these plasma sources magnetic transformers (MTs) and inductors are typically used in power supplies but they present several drawbacks that are even more evident when dealing with high-voltage normally used in APPJs. To overcome these disadvantages, high frequency generators with the absence of MT are proposed in the literature. However, in the case of miniaturized APPJs these conventional power converters, built of ferromagnetic cores and inductors or by means of LC resonant tank circuits, are not so useful as piezoelectric transformer (PT) based power converters due to bulky components and small efficiency. We made and examined a novel atmospheric pressure plasma jet with PT supplier served as ionization source for ambient mass spectrometry, and especially mobile spectrometry where miniaturization, integration of components, and clean plasma are required. The objective of this paper is to describe the concept, design, and implementation of this miniaturized piezoelectric transformer-based atmospheric pressure plasma jet. PMID:24880391

  3. Atmospheric pressure plasma jet with high-voltage power supply based on piezoelectric transformer

    International Nuclear Information System (INIS)

    The dielectric barrier discharge plasma jet, an example of the nonthermal atmospheric pressure plasma jet (APPJ), generates low-temperature plasmas that are suitable for the atomization of volatile species and can also be served as an ionization source for ambient mass and ion mobility spectrometry. A new design of APPJ for mass spectrometry has been built in our group. In these plasma sources magnetic transformers (MTs) and inductors are typically used in power supplies but they present several drawbacks that are even more evident when dealing with high-voltage normally used in APPJs. To overcome these disadvantages, high frequency generators with the absence of MT are proposed in the literature. However, in the case of miniaturized APPJs these conventional power converters, built of ferromagnetic cores and inductors or by means of LC resonant tank circuits, are not so useful as piezoelectric transformer (PT) based power converters due to bulky components and small efficiency. We made and examined a novel atmospheric pressure plasma jet with PT supplier served as ionization source for ambient mass spectrometry, and especially mobile spectrometry where miniaturization, integration of components, and clean plasma are required. The objective of this paper is to describe the concept, design, and implementation of this miniaturized piezoelectric transformer-based atmospheric pressure plasma jet

  4. Atmospheric pressure plasma jet with high-voltage power supply based on piezoelectric transformer

    Science.gov (United States)

    Babij, Micha?; Kowalski, Zbigniew W.; Nitsch, Karol; Silberring, Jerzy; Gotszalk, Teodor

    2014-05-01

    The dielectric barrier discharge plasma jet, an example of the nonthermal atmospheric pressure plasma jet (APPJ), generates low-temperature plasmas that are suitable for the atomization of volatile species and can also be served as an ionization source for ambient mass and ion mobility spectrometry. A new design of APPJ for mass spectrometry has been built in our group. In these plasma sources magnetic transformers (MTs) and inductors are typically used in power supplies but they present several drawbacks that are even more evident when dealing with high-voltage normally used in APPJs. To overcome these disadvantages, high frequency generators with the absence of MT are proposed in the literature. However, in the case of miniaturized APPJs these conventional power converters, built of ferromagnetic cores and inductors or by means of LC resonant tank circuits, are not so useful as piezoelectric transformer (PT) based power converters due to bulky components and small efficiency. We made and examined a novel atmospheric pressure plasma jet with PT supplier served as ionization source for ambient mass spectrometry, and especially mobile spectrometry where miniaturization, integration of components, and clean plasma are required. The objective of this paper is to describe the concept, design, and implementation of this miniaturized piezoelectric transformer-based atmospheric pressure plasma jet.

  5. Atmospheric pressure plasma jet with high-voltage power supply based on piezoelectric transformer

    Energy Technology Data Exchange (ETDEWEB)

    Babij, Micha?; Kowalski, Zbigniew W., E-mail: zbigniew.w.kowalski@pwr.wroc.pl; Nitsch, Karol; Gotszalk, Teodor [Wroc?aw University of Technology, Wybrze?e Wyspia?skiego 27, 50-370 Wroc?aw (Poland); Silberring, Jerzy [AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Kraków (Poland)

    2014-05-15

    The dielectric barrier discharge plasma jet, an example of the nonthermal atmospheric pressure plasma jet (APPJ), generates low-temperature plasmas that are suitable for the atomization of volatile species and can also be served as an ionization source for ambient mass and ion mobility spectrometry. A new design of APPJ for mass spectrometry has been built in our group. In these plasma sources magnetic transformers (MTs) and inductors are typically used in power supplies but they present several drawbacks that are even more evident when dealing with high-voltage normally used in APPJs. To overcome these disadvantages, high frequency generators with the absence of MT are proposed in the literature. However, in the case of miniaturized APPJs these conventional power converters, built of ferromagnetic cores and inductors or by means of LC resonant tank circuits, are not so useful as piezoelectric transformer (PT) based power converters due to bulky components and small efficiency. We made and examined a novel atmospheric pressure plasma jet with PT supplier served as ionization source for ambient mass spectrometry, and especially mobile spectrometry where miniaturization, integration of components, and clean plasma are required. The objective of this paper is to describe the concept, design, and implementation of this miniaturized piezoelectric transformer-based atmospheric pressure plasma jet.

  6. Design of power oscillator for 500 keV/20 mA Cockroft-Walton high voltage supply

    International Nuclear Information System (INIS)

    A design of power oscillator for Cockroft-Walton high voltage supply was carried out. This high voltage supply would be used as the acceleration voltage supply of an electron beam machine designed to have 500 keV/20 mA capacity. The power oscillator design consisted of output specification, circuit diagram, power supply and oscillator main components determinations. The power oscillator output wave power, voltage and frequency designed according to voltage multiplier input requirements. The design results showed that the circuit was class-c tickler oscillator having an output specification of 12.1 kW, 15 kV and 40 kHz sinus wave. The main component was a ITK 15-2 triode tube. (author)

  7. Device for slow switching in and off the high-voltage power supply

    International Nuclear Information System (INIS)

    An electronic circuit is described which permits smoothly step up voltage at the outlet of a high-voltage power source in case it is connected and smoothly step it down in case it is disconnected. Voltage switching period approximates 17 min and occasionally may vary

  8. A high power water cooled resistor for the high voltage power supply in the TRIUMF RF system

    International Nuclear Information System (INIS)

    The TRIUMF RF system high voltage power supply requires 0.5 ohm current limiting resistors to protect amplifier components during transients and crowbar operations. The crowbar typically causes a 16,000 amp transient pulse followed by a 4,000 amp current for 55 ms until the circuit breaker opens. The resulting stresses produced catastrophic failure of the original design within 100 crowbar cycles. A new resistor design has been developed to improve heat transfer characteristics and reduce current densities. Design changes were evaluated during extensive testing of a full scale model. The test results are reported with the resulting design described in detail

  9. Improved Model of New Six-Phase High Voltage Power Supply for Industrial Microwave Generators with A Single Magnetron By Phase

    OpenAIRE

    BOUBKAR BAHANI; N. El Ghazal

    2014-01-01

    This original work treats the feasibility study of new type of high voltage power supply with a character six-phase for a magnetron 800 Watts-2450 MHz per phase for industrial microwave generators. The design of this new power supply uses a new sex identical single-phase high voltage transformer with magnetic leakage flux, coupled in star. Each single phase supply a cells which multiples the voltage, stabilizes the current and supplies in its turn a single magnetron. The ? eq...

  10. Fuzzy Control of High-Voltage Pulse Power Supply for Electron Cyclotron Resonance Heating Based on Integral-Separate Method

    International Nuclear Information System (INIS)

    The negative high-voltage pulse power supply for the electron cyclotron resonance heating (ECRH) is a key support to the cyclotron's functioning and good performance is highly required. The principle of operation was analyzed and the model was given. According to the nonlinear characteristics of tetrode and the supply's control requirements, fuzzy control theory based on integral-separate was adopted, which combined intelligent control with power technology. Simulation results show that this system has good overshot-restrained, self-adaptive and auto-negotiating abilities using this method in comparison with PID method. This is a good new control and will be benefit to digital control intelligently. (authors)

  11. The high voltage power supply for the acceleration grids of the TEXTOR neutral injectors

    International Nuclear Information System (INIS)

    The paper describes the 55 kV, 100 A power supply for feeding the accel grid of the TEXTOR neutral beam injector. It introduces a new solution for such a power supply making use of 68 uncontrolled dc sources (choppers) connected in series. The output voltage of the system is given by the number of choppers which are switched on simultaneously. The first supply unit shall be commissioned in autumn 1985

  12. Electrical Power Supply to Offshore Oil Installations by High Voltage Direct Current Transmission

    OpenAIRE

    Myhre, Jørgen Chr

    2001-01-01

    This study was initiated to investigate if it could be feasible to supply offshore oil installations in the North Sea with electrical power from land. A prestudy of alternative converter topologies indicated that the most promising solution would be to investigate a conventional system with reduced synchronous compensator rating. The study starts with a summary of the state of power supply to offshore installations today, and a short review of classical HVDC transmission. It goes on to analys...

  13. A high voltage power supply for construction, operation and internal modulation of He-Ne gas laseks

    International Nuclear Information System (INIS)

    A high voltage de operated power supply has been designed and developed for portable He-Ne laser radiation sources using locally available electronic components. It is a dc-dc converter with an input power from a 12 volts car battery or a set of Ni-Cd batteries or a suitable rated main's adapter with peak current from 3 to 5 amperes or greater. The maximum do output of this supply could be 1.0kV or more without load. The current consumption is modest at about 1Amp. The output current stabilization of the supply is about 5mA. To keep the laser beam intensity at the maximum level without shortening the life of the laser tube, it may draw currents up to from between 2 to 5mK at a load sink voltage between 1300 to 1500 V. (author)

  14. Analysis of crowbar action of high voltage DC power supply in the LHD ICRF system

    International Nuclear Information System (INIS)

    Ion Cyclotron Range of Frequency (ICRF) heating will be applied to the Large Helical Device (LHD) at the 2nd experimental campaign in 1998. The LHD ICRF system is characterised by its high power (up to 12 MW at final stage) and steady state operation for more than 30 minutes. One of the main R and D items was a high power and steady state transmitter. The RF transmitter system having a wide frequency range from 25 to 95 MHz was designed and fabricated. This report describes the analysis of the DC power supply that contains the crowbar circuit protecting the tetrode from the arcing inside the tube. The DC power supply of the transmitter is fed from the commercial AC electric line which also supply the power to the LHD helical and poloidal coil power supplies. The voltage drop of the commercial line when the ICRF crowbar action happened is the serious problem for all experimental system. This paper analyses the crowbar effect on the commercial line with and without leakage transformer between the step-up transformer of transmitter and the commercial line. (author)

  15. 130 kV 130 A High voltage switching mode power supply for neutral beam plasma heating: design issues

    International Nuclear Information System (INIS)

    The company JEMA has designed and manufactured two High Voltage Switching Mode Power Supplies (HVSMPS), rated at 130 kV dc and 130 A, each of which will feed the accelerator grids of two Positive Ion Neutral Injector (PINI) loads, to be installed at the Joint European Torus (EFDA-JET facility located at Culham, UK). The solution designed by JEMA includes two matching transformers which adapt the 36 kV of the JET AC power distribution network to the required 670 V at the secondary side. Additionally, such transformers provide a 30 deg.phase shift which is required by a 30000 A 12 pulse thyristor rectifier. The obtained and stabilised 650 V feed 120 IGBT invertors, which operate at 2778 Hz with modulated square waveform. Each invertor feeds a High Insulation High Frequency Transformer. The 120 transformers corresponding to one power supply are arranged in three oil filled tanks and provide the main insulation from the low voltage to the high voltage side. The square waveform obtained at the secondary of each transformer is rectified by means of a diode bridge. The connection in series of the 120 diode bridges provides the required 130 kV d.c. at the output. In order to protect the load, a redundant solid state crowbar has been designed. Such short circuiting device is composed of 26 Light Triggered Thyristors (LTTs), connected in series. Electrical simulations have been carried out in order to ensure that the system complies with the requirements of high accuracy and adh the requirements of high accuracy and adequate protection of the load. The critical design of the High Voltage-High Frequency Transformers has also required electrostatic simulations of the electric field distribution

  16. A novel high-frequency multiphase crowbarless high-voltage dc power supply

    International Nuclear Information System (INIS)

    A novel topology based on high frequency switching resonant immittance converters (RICs) is proposed in this paper. The principle of operation, design, simulation and experimental results on a - 20 kV, 1 A dc prototype power supply, that uses a three-phase RIC operating with 120° phase shift involving switching at 25 kHz and a dc-dc step down converter with energy recovery snubber in the front-end, is presented. (author)

  17. Photomultiplier mutichannel high-voltage power supply system with overload protection

    International Nuclear Information System (INIS)

    64 channel power supply system for a photomultiplier equipped with overload protection and remote measurement of output voltage of each channel is described. Output voltage is simultaneously controlled in a group of 16 channels in the range of 1-3 kV. Range of independent control in the group is equal to 700 V at a current of 1.5mA/channel

  18. Multiple high voltage power supply controls solution using compact, distributed Ethernet based PC boards and Linux/Windows based GUIS

    International Nuclear Information System (INIS)

    Compact Ethernet based High voltage PC boards have been developed, tested and produced to use as an integrated HV power supply unit to generate and control voltages varying from 0 to 2000 V dc from any OS independent PC platform. The Neutron gamma array (NAND) project at IUAC will need distributed control of at least 120 such units over a private Local Area Network to bias detectors. These Power supplies are being made as five independent boxes, each box consisting of 24 such HV PC boards and they will be interconnected using network switches. Presently, a compact two layer board with the PICO make DC-DC HV converter mounted on PCB, put together in a group of 24 of them, have been built and fully tested. The advantage of such a system is that, it is easily expandable to a large number of power supplies with low cost, globally accessible, multiple users in a network can set or read any power supply value through an OS independent PC. Control GUI applications are developed using C, IUAC PCLI, Qt C++ etc. and have been successfully tested. (author)

  19. Switching mode high voltage DC regulated power supply for inflector of cyclotron along with on-line beam current measurement

    International Nuclear Information System (INIS)

    For the Inflector of K-130 cyclotron at V.E.C. Centre, Kolkata, a dc regulated power supply (15 kV, 10 ma, 0.1% regulation) with CV/CC mode of operation is designed and fabricated which is running round-the-clock for more then two years. Based on same technique, several other high voltage and high current type of dc regulated Switching- Mode-Power Supplies (SMPS), have been fabricated for VEC Centre and for other institutions also, such as SINP Calcutta, NPL New Delhi etc. This Power Supply uses Pulse-Width-Modulation (Pm) technique in which two similar square-wave pulses but opposite in phase are used for DC-to-Ac converter at very high frequency. By the process of switching, the power dissipation in the regulating elements is minimum which makes it highly efficient. The advantage of operating at higher switching frequency is to reduce the size of transformer and filter capacitors which makes it cheaper

  20. Computer control of the high-voltage power supply for the DIII-D Electron Cyclotron Heating system

    International Nuclear Information System (INIS)

    The D3-D Electron Cyclotron Heating (ECH) high voltage power supply is controlled by a computer. Operational control is input via keyboard and mouse, and computer/power supply interface is accomplished with a Computer Assisted Monitoring and Control (CAMAC) system. User-friendly tools allow the design and layout of simulated control panels on the computer screen. Panel controls and indicators can be changed, added or deleted, and simple editing of user-specific processes can quickly modify control and fault logic. Databases can be defined, and control panel functions are easily referred to various data channels. User-specific processes are written and linked using Fortran, to manage control and data acquisition through CAMAC. The resulting control system has significant advantages over the hardware it emulates: changes in logic, layout, and function are quickly and easily incorporated; data storage, retrieval, and processing are flexible and simply accomplished, physical components subject to wear and degradation are minimized. In addition, the system can be expanded to multiplex control of several power supplied, each with its own database, through a single computer and console. 5 refs., 4 figs., 1 tab

  1. A 2-megawatt load for testing high voltage DC power supplies

    International Nuclear Information System (INIS)

    A high power water-cooled resistive load, capable of dissipating 2 Megawatts at 95 kilovolts is being designed and built. The load utilizes wirewound resistor elements suspended inside insulating tubing contained within a pressure vessel which is supplied a continuous flow of deionized water for coolant. A sub-system of the load is composed of non-inductive resistor elements in an oil tank. Power tests conducted on various resistor types indicate that dissipation levels as high as 22 times the rated dissipation in air can be achieved when the resistors are placed in a turbulent water flow of at least 15 gallons per minute. Using this data, the load was designed using 100 resistor elements in a series arrangement. A single-wall 316 stainless steel pressure vessel with flanged torispherical heads is built to contain the resistor assembly and deionized water. The resistors are suspended within G-11 tubing which span the cylindrical length of the vessel. These tubes are supported by G-10 baffles which also increase convection from the tubes by promoting turbulence within the surrounding water

  2. Integrated high voltage power supply utilizing burst mode control and its performance impact on dielectric electro active polymer actuators

    DEFF Research Database (Denmark)

    Andersen, Thomas; RØdgaard, Martin SchØler

    Through resent years new high performing Dielectric Electro Active Polymers (DEAP) have emerged. To fully utilize the potential of DEAPs a driver with high voltage output is needed. In this paper a piezoelectric transformer based power supply for driving DEAP actuators is developed, utilizing a burst mode control technique. Controlling and driving a DEAP actuator between 250V to 2.5kV is demonstrated, where discrete like voltage change and voltage ripple is observed, which is introduced by the burst mode control. Measurements of the actuator strain-force reveal that the voltage ripples translates to small strain-force ripples. Nevertheless the driver demonstrates good capabilities of following an input reference signal, as well as having the size to fit inside a 110 mm x 32 mm cylindrical InLastor Push actuator, forming a “low voltage” DEAP actuator.

  3. Fault protection system in a 'regulated high voltage power supply (80 KV, 130A)' for neutral beam injector

    International Nuclear Information System (INIS)

    Regulated High Voltage Power Supply (RHVPS) system has been developed at Institute for Plasma Research (IPR) for use with the Neutral Beam and RF applications. The highest ratings manufactured so far is 80 kV, 130 A. The system is developed in house and also being delivered at different research institutes for various applications. Since it is a multi megawatt output power system, and the loads have very low fault energy tolerant, fault protection system is mandatory. Protections are mandatory at each stage of conversion. Output fault protection is done in a variety of ways. Fast turn off at output is achieved and test results are discussed. Multi secondary transformers (5.6 MVA rating, with 40 outputs) are used in realising the power supply. These special transformers need protection even for over current at one secondary when the output fault current is not reflected to primaries to break the main circuit breaker. It becomes difficult to bifurcate fault in such situations. Special technique is applied to sense it. Electronic means are used for fast detection and tripping the system. This paper describes the basic RHVPS topology and test results along with presentation on the input and output fault protection systems. (author)

  4. Fast switching, modular high-voltage DC/AC-power supplies for RF-Amplifiers and other applications

    International Nuclear Information System (INIS)

    A new kind of high voltage high-power Pulse-Step Modulator (PSM) for broadcast transmitters, accelerator sources, for NBI (Neutral Beam Injection for Plasma Heating), gyrotrons and klystrons has been developed. Since its first introduction in 1984 for broadcast transmitters, more than 100 high-power sound broadcast transmitters had been equipped with the first generation of the PSM modulators, using Gate Turn-Off Thyristors (GTOs) as switching elements. Recently, due to faster switching elements and making use of the latest DSP technologies (Digital Signal Processing), the performance data and areas of application could be extended further. In 1994, a precision high voltage source for MW gyrotrons was installed at CRPP in Lausanne. Supplementary very low cost solutions for lower powers but high voltages had been developed. Hence, today, a large area of applications can be satisfied with the family of solutions. The paper describes the principle of operation, the related control systems and refers to some particular applications of the PSM amplifiers, especially the newest developments and corresponding field results

  5. Improved Model of New Six-Phase High Voltage Power Supply for Industrial Microwave Generators with A Single Magnetron By Phase

    Directory of Open Access Journals (Sweden)

    BOUBKAR BAHANI

    2014-10-01

    Full Text Available This original work treats the feasibility study of new type of high voltage power supply with a character six-phase for a magnetron 800 Watts-2450 MHz per phase for industrial microwave generators. The design of this new power supply uses a new sex identical single-phase high voltage transformer with magnetic leakage flux, coupled in star. Each single phase supply a cells which multiples the voltage, stabilizes the current and supplies in its turn a single magnetron. The ? equivalent model of the transformer is developed, taking into account the saturation phenomenon and the stabilization process of each magnetron current. This model is based on the determination of the analytical expressions of its non-linear inductances, that can be determined from the establishment of the B(H magnetization curve of the used material (SF19. This new power supply presents a multiple benefits in terms of reducing of weight, volume, electrical wiring and cost during of the implementation and maintenance of such a new device. The simulation results, upbraided by Matlab-SIMULINK code, are in good agreement with those found by experimental measurement for one magnetron, while respecting the conditions recommended by the manufacturer of magnetron: Ipeak<1.2 A, Imean? 300 mA.

  6. THE SYSTEM OF CONTACT SYSTEM POWER SUPPLY OF DC NETWORK WITH A LONGITUDINAL LINE OF HIGH VOLTAGE

    Directory of Open Access Journals (Sweden)

    Yu. P. Honcharov

    2008-02-01

    Full Text Available The power supply system of a contact network using a longitudinal line with points of communication without transformer is considered. The approach allowing to facilitate power filters and the way of switching of in-series connected semiconductor switches with fixing a voltage on them are offered.

  7. Analysis and design of a high-current-high-voltage accurate power supply for the APS storage ring

    International Nuclear Information System (INIS)

    There are 81 dipole magnets contained in the storage ring at the Advanced Photon Source (APS). These magnets are connected in series and are energized by only one 12-phase power supply. The eighty-first magnet is located in a temperature-controlled room with a NMR probe to monitor the magnetic field in the magnet and provide a reference signal for correction of the field drift due to aging of the components. The current in the magnets will be held at 497 A. The required current stability of the power supply is ±30 ppm, the current reproducibility is ±50 ppm, and the current ripple is ±400 ppm. The voltage required to maintain such a current in the magnets is about 1700 V. Different schemes for regulating current in the magnets are studied. Pspice software is used to simulate the behavior and the design of such a power supply under different conditions. The pros and cons of each scheme will be given and the proper power and regulating scheme will be selected

  8. Low power, scalable multichannel high voltage controller

    Science.gov (United States)

    Stamps, James Frederick (Livermore, CA); Crocker, Robert Ward (Fremont, CA); Yee, Daniel Dadwa (Dublin, CA); Dils, David Wright (Fort Worth, TX)

    2008-03-25

    A low voltage control circuit is provided for individually controlling high voltage power provided over bus lines to a multitude of interconnected loads. An example of a load is a drive for capillary channels in a microfluidic system. Control is distributed from a central high voltage circuit, rather than using a number of large expensive central high voltage circuits to enable reducing circuit size and cost. Voltage is distributed to each individual load and controlled using a number of high voltage controller channel switches connected to high voltage bus lines. The channel switches each include complementary pull up and pull down photo isolator relays with photo isolator switching controlled from the central high voltage circuit to provide a desired bus line voltage. Switching of the photo isolator relays is further controlled in each channel switch using feedback from a resistor divider circuit to maintain the bus voltage swing within desired limits. Current sensing is provided using a switched resistive load in each channel switch, with switching of the resistive loads controlled from the central high voltage circuit.

  9. Laser power supply

    International Nuclear Information System (INIS)

    The laser power supply includes a regulator which has a high voltage control loop based on a linear approximation of a laser tube negative resistance characteristic. The regulator has independent control loops for laser current and power supply high voltage

  10. Medium and high voltage power cables market in Europe

    International Nuclear Information System (INIS)

    This note gives an overview of the European market for medium and high voltage power cables. In this text, emphasis is placed on suppliers and important European clients; there is also a brief review of the different techniques for cable laying and utilization in Europe. This not has mainly been drafted from informations supplied by EUROPACABLE

  11. 130 kV 130 A high voltage switching mode power supply for neutral beam injectors-Control issues and algorithms

    International Nuclear Information System (INIS)

    The company JEMA has delivered to the Joint European Torus (JET facility in Culham) two high voltage switching mode power supplies (HVSMPS) each rated 130 kVdc and 130 A. One HVSMPS feeds the grids of two PINI loads. This paper describes the main control issues and the algorithms developed for the project. The most demanding requirements from the control point of view is an absolute accuracy of ±1300 V and the possibility of performing up to 255 re-applications of the high voltage during a 20 s pulse. Keeping the output voltage ripple to the specified tolerance has been a major achievement of the control system. Since the output stage is formed of several modules (120) connected in series, their stray capacitance to ground significantly influences the individual contribution of each single module to the global output voltage. Two complementary techniques have been used to balance the effects of the stray capacities. The fast re-applications requirement has a significant impact on the intermediate dc link. This section is composed of a capacity of 0.83 F, which feeds the 120 invertor modules. The dc link is fed by a 12 pulse SCR rectifier, whose matching transformers are connected to the 36 kV grid. Every re-application and every voltage shutdown supposes a quasi-instantaneous power step of 17 MW. Fast open loop algorithms have been implemented in order to keep the dc link voltage within acceptable margins. Moreover, the HVSMPS output characteristics have to be mainta output characteristics have to be maintained during the rapid and important voltage fluctuations of the 36 kV mains (28-37 kV). The general control system is based on a Simatic S7 PLC, and a SCADA user interface. Up to 1000 signals are acquired. The control system has shown to be also a useful tool to allow for a rapid and accurate identification of faults and their origin

  12. Computer controlled multichannel high voltage supply system for GRACE instrumentation

    International Nuclear Information System (INIS)

    The high energy gamma ray telescopes being set up by NRL, BARC as part of the GRACE project, require a very large number of (? 1000 nos.) programmable high voltage power supplies for biasing photomultiplier tubes for the detection and characterization of the atmospheric Cerenkov events. These H.V. supplies need to be very compact and lightweight, as they will be mounted on moving telescopes. This paper describes the design aspects of the overall HV system and some preliminary results of the prototype HV modules being developed for such applications. In the new design, the switching frequency of the converters in the H.V. supplies has been increased by a factor of three times as compared to the earlier design, and surface mounted devices has been used to achieve size and weight reductions. The HV system that is designed for modular construction consists of multiple HV modules, each containing 16 independently adjustable HV supplies. All the HV modules in the system are interconnected via a serial I2C bus. Each HV supply has built in over voltage/current, thermal overload protections with output voltage read back and adjustable slew rate control facilities. (author)

  13. High voltage surge protection system for gun power supplies of 3 MeV, 30 kW DC electron beam accelerator

    International Nuclear Information System (INIS)

    A 3 MeV, 30 kW dc industrial electron beam Accelerator is being developed at EBC, Kharghar, Navi Mumbai. The electron gun located at 3 MV terminal requires remotely controlled floating power supplies for filament and anode. As the control electronics operate at low voltages of the order of 15 V, they are vulnerable for conducted and radiated noise from high voltage column discharges. The sensitive electronic components should be protected from common mode and differential mode HV surges. To minimize the surge voltages to safe operating limits of electronic components used, various methods were incorporated and tested in simulated and actual conditions. This surge protection scheme has been installed at 3 MV dome and gun supplies were operated at 1.2 MeV level. They have been withstanding several HV sparks and discharges in the Accelerator with nitrogen gas at 6 kg/cm2. The techniques such as spark gaps, electrostatic screen, surge limiting inductors, cascaded filters, isolation amplifiers, single point grounding and electromagnetic shielding have been described in this paper. (author)

  14. Combined resonant tank capacitance and pulse frequency modulation control for ZCS-SR inverter-fed high voltage DC power supply

    International Nuclear Information System (INIS)

    Conventional pulse frequency modulated (PFM) zero current switching (ZCS) series resonant (SR) inverter fed high voltage dc power supplies have nearly zero switching loss. However, they have limitations of poor controllability at light loads and large output voltage ripple at low switching frequencies. To address these problems, this paper proposes a combined resonant tank capacitance and pulse frequency modulation based control approach. For the realization of the proposed control approach, the tank circuit of the resonant inverter is made up of several resonant capacitors that are switched into or out of the tank circuit by electromechanical switches. The output voltage of the converter is regulated by digitally modulating the resonant tank capacitance and narrowly varying the switching frequency. The proposed control scheme has several features, namely a wide range of controllability even at light loads, less output voltage ripple, and less current stress on the inverter's power switches at light loads. Therefore, the proposed control approach alleviates most of the problems associated with conventional PFM. Experimental results obtained from a scaled down laboratory prototype are presented to verify the effectiveness of the proposed system.

  15. High voltage superconducting switch for power application

    International Nuclear Information System (INIS)

    This paper reports the development of a novel interrupter which meets the requirements of a high voltage direct current (HVDC) power switch and at the same time doubles as a current limiter. The basic concept of the interrupter makes use of a fast superconducting, high capacity (SHIC) switch that carries the full load current while in the superconducting state and reverts to the normal resistive state when triggered. Typical design parameters are examined for the case of a HVDC transmission line handling 2.5KA at 150KVDC. The result is a power switch with superior performance and smaller size than the ones reported to date

  16. Advanced High Voltage Power Device Concepts

    CERN Document Server

    Baliga, B Jayant

    2012-01-01

    Advanced High Voltage Power Device Concepts describes devices utilized in power transmission and distribution equipment, and for very high power motor control in electric trains and steel-mills. Since these devices must be capable of supporting more than 5000-volts in the blocking mode, this books covers operation of devices rated at 5,000-V, 10,000-V and 20,000-V. Advanced concepts (the MCT, the BRT, and the EST) that enable MOS-gated control of power thyristor structures are described and analyzed in detail. In addition, detailed analyses of the silicon IGBT, as well as the silicon carbide MOSFET and IGBT, are provided for comparison purposes. Throughout the book, analytical models are generated to give a better understanding of the physics of operation for all the structures. This book provides readers with: The first comprehensive treatment of high voltage (over 5000-volts) power devices suitable for the power distribution, traction, and motor-control markets;  Analytical formulations for all the device ...

  17. High Voltage Power Transmission for Wind Energy

    Science.gov (United States)

    Kim, Young il

    The high wind speeds and wide available area at sea have recently increased the interests on offshore wind farms in the U.S.A. As offshore wind farms become larger and are placed further from the shore, the power transmission to the onshore grid becomes a key feature. Power transmission of the offshore wind farm, in which good wind conditions and a larger installation area than an onshore site are available, requires the use of submarine cable systems. Therefore, an underground power cable system requires unique design and installation challenges not found in the overhead power cable environment. This paper presents analysis about the benefit and drawbacks of three different transmission solutions: HVAC, LCC/VSC HVDC in the grid connecting offshore wind farms and also analyzed the electrical characteristics of underground cables. In particular, loss of HV (High Voltage) subsea power of the transmission cables was evaluated by the Brakelmann's theory, taking into account the distributions of current and temperature.

  18. High-voltage supply for backward-wave tube

    International Nuclear Information System (INIS)

    A high-current high-voltage supply for a backward-wave tube is described that uses a generalppurpose semiconductor converter with pulse-width modulation and two-stage regulation. The load current is up to 250 mA for load voltages of from 0.5 to 4.5 kV. The voltage staiblity is less than or equal to 5 x 10-6. the root-mean-square output ripple is less than or equal to 2 x 10-6/ The supply is equipped with high-speed (5 usec) load-breakdown protection

  19. Electric generators for high-voltage power accelerators

    International Nuclear Information System (INIS)

    High-voltage generators of various types applied in modern high-voltage power accelerators are considered. The following types of generators are presented: symmetric Cockroft-Walton generator, dynamitron, transformer with insulated core, generators with closed and open magnetic circuit, resonant transformer. Dependences of their maximum permissible power under variations of dimensions, current and voltage are determined. It is pointed out that at further accelerator power increase the advantages of high-voltage generators with inductive connection become determining ?SRT

  20. Developments of high voltage pulse power systems

    International Nuclear Information System (INIS)

    The facilities built at the Plasma Physics Section of the Bhabha Atomic Research Centre, Bombay (India), include charging power supplies upto 300 KV DC, capacitor energy banks upto 6 KJ and pulse forming Marx generator upto 600 KV. The work on the construction of 25 KJ capacitor energy bank and 600 KV transformer is in progress. The activities built around these facilities include an exploding wire system, a flash X-ray generator and a magnetic field flux concentrator. The exploding wire system is used presently for generation of shockwaves. The high dose rate (108 R/Sec.) flash X-ray generator has been successfully employed for dynamic radiographs. Magnetic fields of 200-300 kG generated by the flux concentrator are being used for magnetoforming and cold weld studies. An experimental scheme for the generation of relativistic electron beam of 600 KeV is under fabrication and experiments have been planned for the study of transport of beam and beam interactions with solids, gases and plasma. (K.B.)

  1. Innovation of High Voltage Supply Adjustment Device on Diagnostic X-Ray Machine

    International Nuclear Information System (INIS)

    Innovation of high voltage supply adjustment device on diagnostic x-ray machine has been carried out. The innovation is conducted by utilizing an electronic circuit as a high voltage adjustment device. Usually a diagnostic x-ray machine utilizes a transformer or an auto-transformer as a high voltage supply adjustment device. A high power diagnostic x-ray machine needs a high power transformer which has big physical dimension. Therefore a box control where the transformer is located has to have big physical dimension. Besides, the price of the transformer is expensive and hardly found in local markets. In this innovation, the transformer is replaced by an electronic circuit. The main component of the electronic circuit is Triac BTA-40. As adjustment device, the triac is controlled by a variable resistor which is coupled by a stepper motor. A step movement of stepper motor varies a value of resistor. The resistor value determines the triac gate voltage. Furthermore the triac will open according to the value of electrical current flowing to the gate. When the gate is open, electrical voltage and current will flow from cathode to anode of the triac. The value of these electrical voltage and current depend on gate open condition. Then this triac output voltage is feed to diagnostic x-ray machine high voltage supply. Therefore the high voltage value of diagnostic x-ray machine is adjusted by the output voltage of the electronic circuit. By using this electronic circuit, the physical dimension of diagnostic x-ray machine box control and the price of the equipment can be reduced. (author)

  2. High voltage series resonant inverter ion engine screen supply. [SCR series resonant inverter for space applications

    Science.gov (United States)

    Biess, J. J.; Inouye, L. Y.; Shank, J. H.

    1974-01-01

    A high-voltage, high-power LC series resonant inverter using SCRs has been developed for an Ion Engine Power Processor. The inverter operates within 200-400Vdc with a maximum output power of 2.5kW. The inverter control logic, the screen supply electrical and mechanical characteristics, the efficiency and losses in power components, regulation on the dual feedback principle, the SCR waveforms and the component weight are analyzed. Efficiency of 90.5% and weight density of 4.1kg/kW are obtained.

  3. Bipolar high voltage pulse power generator.

    Czech Academy of Sciences Publication Activity Database

    Lukeš, Petr; ?lupek, Martin; Babický, Václav; Šunka, Pavel

    Monterey, 2005, s. 44. [IEEE International Pulsed Power Conference/15th./. Portola Plaza Hotel , Monterey, CA, USA (US), 13.06.2005-17.06.2005] R&D Projects: GA AV ?R KSK2043105 Keywords : bipolar * pulse power generator * corona discharge Subject RIV: BL - Plasma and Gas Discharge Physics

  4. Bipolar high voltage pulse power generator.

    Czech Academy of Sciences Publication Activity Database

    Lukeš, Petr; ?lupek, Martin; Babický, Václav; Šunka, Pavel

    Monterey : IEEE, 2007 - (Maenchen, J.; Schamiloglu, E.), s. 1061-1064 ISBN 0-7803-9190-X. [IEEE International Pulsed Power Conference/15th./. Portola Plaza Hotel , Monterey (US), 13.06.2005-17.06.2005] R&D Projects: GA AV ?R KSK2043105 Institutional research plan: CEZ:AV0Z20430508 Keywords : bipolar * pulse power generator * corona discharge Subject RIV: BL - Plasma and Gas Discharge Physics

  5. 30 CFR 75.812-2 - High-voltage power centers and transformers; record of examination.

    Science.gov (United States)

    2010-07-01

    ...2010-07-01 2010-07-01 false High-voltage power centers and transformers; record of...STANDARDS-UNDERGROUND COAL MINES Underground High-Voltage Distribution § 75.812-2 High-voltage power centers and transformers; record...

  6. 50 kV/4A high voltage constant current supply

    International Nuclear Information System (INIS)

    A constant current high voltage power supply is described, which is used to charging the capacitor banks quickly and efficiently in pulse power technology. The three-phase alternating current is rectified with the half-controlled bridge mode of Silicon Controlled Rectifier (SCR), then, is imported into the constant current network consisted of two SCR, storage energy inductance, continuous current diode and Hall sensor, thirdly is changed inversely into 1 kHz A. C by the self-controlled SCR bridge circuit, finally, is put into a step-up transformer and rectified by SCR

  7. High voltage, magnetically switched pulsed power systems

    International Nuclear Information System (INIS)

    The principles of magnetic switching are briefly described. Then the results of experiments on the following substantive topics for magnetic switching are presented: material properties and how they relate to switch performance, risetime limitations, and core insulation. Magnetic switching is then evaluated from a system perspective. An idealized pulse power system with 200 kJ or stored energy and a 40 ns output pulse is examined. The multi-megavolt electrical insulation requirements impose limitations on the switches. The cost of the magnetically switched system exceeds the cost of the conventional superpower generator system by up to 75%. The potential for reliability, reproducibility, and repetitive pulse capability must be evaluated for each application to offset the increased cost

  8. Complete low power controller for high voltage power systems

    International Nuclear Information System (INIS)

    The MHV100 is a custom CMOS integrated circuit, developed for the AMS experiment. It provides complete control for a single channel high voltage (HV) generator and integrates all the required digital communications, D to A and A to D converters, the analog feedback loop and output drivers. This chip has been designed for use in both distributed high voltage systems or for low cost single channel high voltage systems. The output voltage and current range is determined by the external components

  9. Electric Power Generation and Storage Using a High Voltage Approach

    OpenAIRE

    Bolund, Björn

    2006-01-01

    Production and consumption of electricity have grown enormously during the last century. No mater what the primary source of energy is, almost all generation of electricity comes from conversion of a rotational movement in a generator. The aim of this thesis is to see how high voltage technology influence production and storage of electricity. Power flow in the generators used to convert mechanical movement to electric energy is analyzed using Poynting‘s vector. The impact of new generator ...

  10. Current supply control device for high-voltage supply, particularly to an ionization chamber

    International Nuclear Information System (INIS)

    This invention aims to indicate a way for avoiding measurement errors in the ionization chambers used for monitoring particle accelerators and which consequently are charged with very high dose rates during short radiation pulses. The invention starts from the known fact according to which, with very high dose rates, owing to the probability -increased by the ionization density- of a recombination of the ions, the dependence of the measurement signal, with respect to the residence time of the ions in the ionization chamber and consequently with respect to the voltage applied to the ionization chamber, is increased. This is why, in the case of a control system for the supply of current of the kind indicated above, under the invention, use is made of a switching device controlled by a measuring device to a large extent without hysteresis and separated from the high voltage by galvanic effect. The special advantage of this is that the signal from the ionization chamber is only used when the high voltage reaches a minimal value. This minimal value is where possible in the proportional region or bracket of the ionization chamber

  11. Technological Aspects: High Voltage

    CERN Document Server

    Faircloth, D C

    2013-01-01

    This paper covers the theory and technological aspects of high-voltage design for ion sources. Electric field strengths are critical to understanding high-voltage breakdown. The equations governing electric fields and the techniques to solve them are discussed. The fundamental physics of high-voltage breakdown and electrical discharges are outlined. Different types of electrical discharges are catalogued and their behaviour in environments ranging from air to vacuum are detailed. The importance of surfaces is discussed. The principles of designing electrodes and insulators are introduced. The use of high-voltage platforms and their relation to system design are discussed. The use of commercially available high-voltage technology such as connectors, feedthroughs and cables are considered. Different power supply technologies and their procurement are briefly outlined. High-voltage safety, electric shocks and system design rules are covered.

  12. 30 CFR 56.12071 - Movement or operation of equipment near high-voltage power lines.

    Science.gov (United States)

    2010-07-01

    ...Movement or operation of equipment near high-voltage power lines. 56.12071 Section 56...Movement or operation of equipment near high-voltage power lines. When equipment must be moved or operated near energized high-voltage powerlines (other than trolley...

  13. An implantable neurostimulator with an integrated high-voltage inductive power-recovery frontend

    Science.gov (United States)

    Yuan, Wang; Xu, Zhang; Ming, Liu; Peng, Li; Hongda, Chen

    2014-10-01

    This paper present a highly-integrated neurostimulator with an on-chip inductive power-recovery frontend and high-voltage stimulus generator. In particular, the power-recovery frontend includes a high-voltage full-wave rectifier (up to 100 V AC input), high-voltage series regulators (24/5 V outputs) and a linear regulator (1.8/3.3 V output) with bandgap voltage reference. With the high voltage output of the series regulator, the proposed neurostimulator could deliver a considerably large current in high electrode-tissue contact impedance. This neurostimulator has been fabricated in a CSMC 1 ?m 5/40/700 V BCD process and the total silicon area including pads is 5.8 mm2. Preliminary tests are successful as the neurostimulator shows good stability under a 13.56 MHz AC supply. Compared to previously reported works, our design has advantages of a wide induced voltage range (26–100 V), high output voltage (up to 24 V) and high-level integration, which are suitable for implantable neurostimulators.

  14. High voltage insulation of bushing for HTS power equipment

    Science.gov (United States)

    Kim, Woo-Jin; Choi, Jae-Hyeong; Kim, Sang-Hyun

    2012-12-01

    For the operation of high temperature superconducting (HTS) power equipments, it is necessary to develop insulating materials and high voltage (HV) insulation technology at cryogenic temperature of bushing. Liquid nitrogen (LN2) is an attractive dielectric liquid. Also, the polymer insulating materials are expected to be used as solid materials such as glass fiber reinforced plastic (GFRP), polytetra-fluoroethylene (PTFE, Teflon), Silicon (Si) rubber, aromatic polyamide (Nomex), EPDM/Silicon alloy compound (EPDM/Si). In this paper, the surface flashover characteristics of various insulating materials in LN2 are studied. These results are studied at both AC and impulse voltage under a non-uniform field. The use of GFRP and Teflon as insulation body for HTS bushing should be much desirable. Especially, GFRP is excellent material not only surface flashover characteristics but also mechanical characteristics at cryogenic temperature. The surface flashover is most serious problem for the shed design in LN2 and operation of superconducting equipments.

  15. High-Voltage, Low-Power BNC Feedthrough Terminator

    Science.gov (United States)

    Bearden, Douglas

    2012-01-01

    This innovation is a high-voltage, lowpower BNC (Bayonet Neill-Concelman) feedthrough that enables the user to terminate an instrumentation cable properly while connected to a high voltage, without the use of a voltage divider. This feedthrough is low power, which will not load the source, and will properly terminate the instrumentation cable to the instrumentation, even if the cable impedance is not constant. The Space Shuttle Program had a requirement to measure voltage transients on the orbiter bus through the Ground Lightning Measurement System (GLMS). This measurement has a bandwidth requirement of 1 MHz. The GLMS voltage measurement is connected to the orbiter through a DC panel. The DC panel is connected to the bus through a nonuniform cable that is approximately 75 ft (approximately equal to 23 m) long. A 15-ft (approximately equal to 5-m), 50-ohm triaxial cable is connected between the DC panel and the digitizer. Based on calculations and simulations, cable resonances and reflections due to mismatched impedances of the cable connecting the orbiter bus and the digitizer causes the output not to reflect accurately what is on the bus. A voltage divider at the DC panel, and terminating the 50-ohm cable properly, would eliminate this issue. Due to implementation issues, an alternative design was needed to terminate the cable properly without the use of a voltage divider. Analysis shows how the cable resonances and reflections due to the mismatched impedances of the cable connecting the orbiter bus and the digitizer causes the output not to reflect accurately what is on the bus. After simulating a dampening circuit located at the digitizer, simulations were performed to show how the cable resonances were dampened and the accuracy was improved significantly. Test cables built to verify simulations were accurate. Since the dampening circuit is low power, it can be packaged in a BNC feedthrough.

  16. High Power, High Voltage Electric Power System for Electric Propulsion

    Science.gov (United States)

    Aintablian, Harry; Kirkham, Harold; Timmerman, Paul

    2006-01-01

    This paper provides an overview of the 30 KW, 600 V MRHE power subsystem. Descriptions of the power subsystem elements, the mode of power transfer, and power and mass estimates are presented. A direct-drive architecture for electric propulsion is considered which reduces mass and complexity. Solar arrays with concentrators are used for increased efficiency. Finally, the challenges due to the environment of a hypothetical lunar mission as well as due to the advanced technologies considered are outlined.

  17. Improvement of Routine Test Process of High Voltage Power Capacitors

    OpenAIRE

    Vennerberg, Patrik

    2009-01-01

    The capacitor test process at ABB Capacitors in Ludvika must be improved to meet future demands for high voltage products. To find a solution to how to improve the test process, an investigation was performed to establish which parts of the process are used and how they operate. Several parts which can improves the process were identified. One of them was selected to be improved in correlation with the subject, mechanical engineering. Four concepts were generated and decision matrixes were us...

  18. Spatial and temporal instabilities in high voltage power devices

    Energy Technology Data Exchange (ETDEWEB)

    Milady, Saeed

    2010-01-29

    Dynamic avalanche can occur during the turn-off process of high voltage bipolar devices, e.g. IGBTs and p{sup +}n{sup -}n{sup +} power diodes, that may result in spatial instabilities of the homogeneous current density distribution across the device and the formation of current filaments. Filaments may cause the destruction of the device, mainly because of the high local temperatures. The first part of this work is dedicated to the current filament behavior. The positive feedback mechanisms caused by the transient current flow through the gate capacitance of an IGBT operating under short circuit conditions may result in oscillations and temporal instabilities of the IGBT current. The oscillations may cause electromagnetic interference (EMI). Furthermore, the positive feedback mechanism may accelerate the over-heating of the device and result in a thermal run-away. This is the subject of the second part of this work. In the first part of this work using the device simulation results of power diodes the underlying physical mechanisms of the filament dynamic is investigated. Simulation results of diode structures with evenly distributed doping inhomogeneities show that, the filament motion gets smoother as the distance between the inhomogeneities decreases. Hopping to faraway inhomogeneities turns into the hopping to neighboring ones and finally a smooth motion. In homogeneous structures the slow inhibitory effect of the electron-hole plasma extraction and the fast activation, due to hole current flowing along the filament, result in a smooth filament motion. An analytical model for the filament velocity under isothermal conditions is presented that can reproduce the simulation data satisfactorily. The influence of the boundary conditions on the filament behavior is discussed. The positive beveled edge termination prohibits a long stay of the filament at the edge reducing the risk of filament pinning. Self-heating effects may turn the initially electrically triggered avalanche filament into a thermally one. In contrast to the avalanche induced filaments, the thermally generated filaments are pinned because of the self-heating leading in the destruction of the device by thermal run-away. In the second part of this work the transient behavior of the IGBT under short-circuit operations is considered. A simple small-signal model shows that, even without considering stray inductances or the interaction of parallel devices, oscillations and unstable behavior of the IGBT current are possible. The criteria for oscillation and their dependence on parameters of the device and external circuit are derived. The apparent negative gate capacitance is the result of the current feedback through the Miller capacitance. For the proposed model instability occurs only if the input capacitance becomes negative. The stable operation range can be determined using the AC small-signal device simulation results (frequency-domain analysis under small-signal conditions). These results can be considered as design criteria to avoid instabilities.

  19. High voltage generator circuit with low power and high efficiency applied in EEPROM

    International Nuclear Information System (INIS)

    This paper presents a low power and high efficiency high voltage generator circuit embedded in electrically erasable programmable read-only memory (EEPROM). The low power is minimized by a capacitance divider circuit and a regulator circuit using the controlling clock switch technique. The high efficiency is dependent on the zero threshold voltage (Vth) MOSFET and the charge transfer switch (CTS) charge pump. The proposed high voltage generator circuit has been implemented in a 0.35 ?m EEPROM CMOS process. Measured results show that the proposed high voltage generator circuit has a low power consumption of about 150.48 ?W and a higher pumping efficiency (83.3%) than previously reported circuits. This high voltage generator circuit can also be widely used in low-power flash devices due to its high efficiency and low power dissipation. (semiconductor integrated circuits)

  20. Monitoring of high voltage supply using the Controller Area Network protocol

    International Nuclear Information System (INIS)

    Full text: In recent years, experimental physics has made great progress in the investigation of the phenomenology of neutrinos, with significant contribution from experiments using nuclear reactors as source of particles. In this context, The Neutrinos Angra Project proposes the use of an anti-neutrinos detector with ability to monitor parameters related to the activity of nuclear reactors. One of the tasks defined in the project is the development of a system to control and to monitor the high voltage supply units used by the photomultiplier tubes (PMTs) of the detector. The solution proposed in this work is based on the use of microcontrollers, from Microchip PIC family to adjust the operating point of the high voltage supply units and to acquire the current and output voltage data. Analysis of these data allows the effective control of the gain of the PMTs and to identify anomalous operational conditions. In this work is proposed the study of the Controller Area Network (CAN) protocol and the implementation of a laboratory network to reproduce the typical operations of data acquisition and information transfer between the nodes. The development of this network is divided in two stages. The first part consisted of the setup of a CAN network, using the PIC18F2680 microcontroller, which has the CAN protocol internally implemented. This network serves as a reduced model of the final system, allowing simulation of typical situations of data acquisition and transmissiontions of data acquisition and transmission between the nodes and a computer. In the second part of the work, the PIC18F4550 microcontroller was associated with the external CAN controller MCP2515 to develop a CAN/USB converter. This converter provides a new communication channel between network nodes and the computer, in addition to the RS232 interface. (author)

  1. High Power, High Voltage FETs in Linear Applications: A User's Perspective

    Energy Technology Data Exchange (ETDEWEB)

    N. Greenough, E. Fredd, S. DePasquale

    2009-09-21

    The specifications of the current crop of highpower, high-voltage field-effect transistors (FETs) can lure a designer into employing them in high-voltage DC equipment. Devices with extremely low on-resistance and very high power ratings are available from several manufacturers. However, our experience shows that high-voltage, linear operation of these devices at near-continuous duty can present difficult reliability challenges at stress levels well-below their published specifications. This paper chronicles the design evolution of a 600 volt, 8 ampere shunt regulator for use with megawatt-class radio transmitters, and presents a final design that has met its reliability criteria.

  2. Pulsed high voltages. High power switching. Application to new accelerators

    International Nuclear Information System (INIS)

    This work deals with two aspects of the use of pulsed high voltages. The first one relies on the realisation of high energy generators (W>MJ) for magnetic striction plasma experiments (Z-pinch) in order to realize intense X sources (some few keV). The system retained is an inductive storage generator which includes a fast Marx generator (T/4<1 s) and a plasma opening switch (POS). The realization of a Marx generator with a minimized current rise time has led to study a low inductance switch (some few nH): the surface spark gap. The model built works in the ambient air at the nominal voltage of 40 kV and with a current of about 900 kA, and its inductance is lower than 5 nH. Its service life exceeds 1000 firings. The choice of materials, the triggering system, and most of the other influencing parameters of the surface spark gap have been studied. Some applications (system with two surface spark gaps, flat line Marx) of this spark gap are also indicated. The second aspect concerns the generation of microwaves using the electron beam - electromagnetic wave interaction (free electrons laser, Cherenkov plasma tube,..) using a generator developed in the laboratory: the Labutron, which particularity is its high impedance cables (about 1000) that can deliver a micro-second pulse with a stable voltage plateau during 700-800 ns. The work presented concerns the development of a cold cathode diode for the production of the electron beam. The diode built can work at about 400 kV aThe diode built can work at about 400 kV and under an impedance of about 950. Several options are proposed to improve the performances obtained. (J.S.)

  3. Fast Decoupled Power Flow for Power System with High Voltage Direct Current Transmission Line System

    Directory of Open Access Journals (Sweden)

    Prechanon Kumkratug

    2010-01-01

    Full Text Available Problem statement: High voltage direct current transmission line system has been widely applied for control power flow in power system. The power flow analysis was the one of powerful tools by which the power system equipped was analyzed both for planning and operation strategies. Approach: This study presented the method to analyze power flow of power system consisted of HVDC system. HVDC was modeled as the complex power injections. The presented complex power injected was incorporated into the existing power flow program based on fast decoupled method. The presented method was tested on the multimachine power system. Results: The transmission line loss of the system with and without HVDC was compared. Conclusion: From the simulation results, the HVDC can reduce transmission line loss of power system.

  4. Offshore Power Transmission :Submarine high voltage transmission alternatives

    OpenAIRE

    Ulsund, Ragnar

    2009-01-01

    Offshore power transmission is becoming an increasingly important issue. To moderate climate change, world leaders have set environmental goals that will be very difficult to reach without renewable power production and the removal of production units with high emissions. Wind power and electrification have been the focus in this report. Plans for the expensive wind power are already moving offshore. This report has made an attempt at suggesting a guideline for well-suited transmissio...

  5. High-voltage, high-power architecture considerations

    International Nuclear Information System (INIS)

    Three basic EPS architectures, direct energy transfer, peak-power tracking, and a potential EPS architecture for a nuclear reactor are described and compared. Considerations for the power source and energy storage are discussed. Factors to be considered in selecting the operating voltage are pointed out. Other EPS architecture considerations are autonomy, solar array degrees of freedom, and EPS modularity. It was concluded that selection of the power source and energy storage has major impacts on the spacecraft architecture and mass

  6. Overview of power converter designs feasible for high voltage transformer-less wind turbine

    DEFF Research Database (Denmark)

    Sztykiel, Michal

    2011-01-01

    Many leading wind turbine manufacturers are pushing forward in variable-speed wind turbines, often exceeding 5 MW. Therefore, novel designs and concepts for optimal high power wind turbines appeared. One of the most promising concepts is the high voltage (10-35 kV) transformer-less topology. High voltage design enables low power losses and elimination of bulky step-up transformer from the wind turbine system. However, new challenges appear for such topology, which have to be properly identified and successfully overcome. This paper presents possible concept for transformer-less wind turbine topology along with an overview of most promising candidates for optimal full-scale power converter design. Study is carried with proposed and justified high voltage wind turbine application along with selection of existing and most promising multilevel power converter topologies, which could be successfully proposed for transformer-less wind turbines.

  7. Design of 154 kV Extra-High-Voltage Prototype SF6 Bushing for Superconducting Electric Power Applications

    Science.gov (United States)

    Koo, Ja-yoon; Seong, Jae-gyu; Hwang, Jae-sang; Lee, Bang-wook; Lee, Sang-hwa

    2012-09-01

    One of the critical components to be developed for high-voltage superconducting devices, such as superconducting transformers, cables, and fault current limiters, is a high-voltage bushing to supply a high current to devices without insulation difficulties in cryogenic environments. Unfortunately, suitable bushings for high-temperature-superconductivity (HTS) equipment have not been fully developed to address cryogenic insulation issues. As a fundamental step towards developing the optimum design of the 154 kV prototype SF6 bushing of HTS devices, the puncture and creepage breakdown voltages of glass-fiber-reinforced-plastic (GFRP) were analyzed with a variety of configurations of electrodes and gap distances in the insulation material. And design factors of high-voltage cryogenic bushings were obtained from the result of tests. Finally, the withstand voltage tests of manufacturing a 154 kV extra-high-voltage (EHV) prototype bushing has been performed. Consequently, we verified the insulation level of the newly designed 154 kV EHV cryogenic prototype bushings for superconducting electric power applications.

  8. Power Supply

    Science.gov (United States)

    1991-01-01

    Maxwell Laboratories capacitor charging power supply is the first commercial spinoff from the NASA CCDS program - a consortia of industries and government establishments to accelerate development of ground and space based commercial applications of NASA technology. The power supply transforms and conditions large voltages to charge capacitors used in x-ray sources, medical accelerators, etc. It is lighter, more reliable, more compact and efficient. Originally developed for space lasers, its commercial potential was soon recognized.

  9. High voltage regulator for power modulation of a gyrotron with voltage depressed collector

    International Nuclear Information System (INIS)

    Modulated electron cyclotron resonance absorption of millimetre waves (EHF) is used as a diagnostic tool for heat transport in fusion plasmas and envisaged for MHD mode stabilisation. The EHF output power of a gyrotron is modulated for the generation of heat waves whose propagation through the plasma is a measure for the heat conductivity. Recently gyrotrons were developed in which the electron beam is decelerated after EHF-emission by a voltage depressed collector (VDC). By this mean, the efficiency of EHF generation in gyrotrons is improved from values of typically 30% to values above 50%. For such tubes, the high voltage supply for acceleration has to drive only a leakage current, whereas the beam current can be delivered by a power source with less voltage stability. This paper describes the development of a programmable acceleration voltage source for power modulation of such an advanced 140 GHz / 800 kW VDC-gyrotron used for ECRH on the W7-AS Stellarator. (authors)

  10. Digital measurement of pulsed high-voltage power

    International Nuclear Information System (INIS)

    A method of measuring the passing power of the order of Mw on a frequency of approximately 3 Gcs, based on pulse signal conversion (with a duration of 3-10 ?sec) from an electron-tube detector head operating in the quadratic mode, in the sequence of pulses, recorded by a tridischarge decimal counter id described. Instrument linearity is not worse than 2% in the range of 18 db

  11. Topics in high voltage pulsed power plasma devices and applications

    Science.gov (United States)

    Chen, Hao

    Pulsed power technology is one of the tools that is used by scientists and engineers nowadays to produce gas plasmas. The transient ultra high power is able to provide a huge pulse of energy which is sometimes greater than the ionization energy of the gas, and therefore separates the ions and electrons to form the plasma. Sometimes, the pulsed power components themselves are plasma devices. For example, the gas type switches can "turn on" the circuit by creating the plasma channel between the switch electrodes. Mini Back Lighted Thyratron, or as we call it, mini-BLT, is one of these gas type plasma switches. The development of the reduced size and weight "mini-BLT" is presented in this dissertation. Based on the operation characteristics testing of the mini-BLT, suggestions of optimizing the design of the switch are proposed. All the factors such as the geometry of the hollow electrodes and switch housing, the gas condition, the optical triggering source, etc. are necessary to consider when we design and operate the mini-BLT. By reducing the diameter of the cylindrical gas path between the electrodes in the BLT, a novel high density plasma source is developed, producing the plasma in the "squeezed" capillary. The pulsed power generator, of course, is inevitably used to provide the ionization energy for hydrogen gas sealed in the capillary. Plasma diagnostics are necessarily analyzed and presented in detail to properly complete and understand the capillary plasma. This high density plasma source (1019 cm-3) has the potential applications in the plasma wakefield accelerator. The resonant oscillation behavior of the particles in plasmas allows for dynamically generated accelerating electric fields that have orders of magnitude larger than those available in the conventional RF accelerators. Finally, the solid state switches are introduced as a comparison to the gas type switch. Pulsed power circuit topologies such as the Marx Bank, magnetic pulse compression and diode opening are used to accomplish the pulse generator design. Their applications for the transient plasma car engine combustion and bio-medical skin cancer cell treatments are also introduced.

  12. High Voltage Power Converter for Large Wind Turbine

    DEFF Research Database (Denmark)

    Sztykiel, Michal

    2014-01-01

    The increasing penetration of the wind energy has resulted in newly planned installations of offshore wind turbines. In order to minimize installation, material and transportation costs of the offshore wind power plants, large multi-MW wind turbine systems are being preferably employed and developed, which allow high power generation of each single unit. Nevertheless, further increase in the power ratings of the newly emerging turbines becomes a major concern related to the operating voltage level. In order to accommodate larger powers, presently employed low voltage (690 V) systems already require multi-parallel converter and filter modules, which increase the overall complexity. In this thesis, a concept for the medium voltage wind turbine is examined and evaluated, where voltage increase is dictated by the removal of the step-up transformer. As a result, an entire wind turbine electrical system operates at 20 kV level - identical as for the collector distribution network. Medium voltage operation allows the converter unit along with the filter to be installed on the base platform inside the tower. In this manner, more space in the nacelle can be flexibly accommodated by the mechanical parts. Due to limited voltage level of the generator insulation system (15 kV) along with the increasing grid integration requirements, special care has been made over the search for optimal full-scale power converter circuitry, which additionally has to compensate voltage differences between the generator-side and a grid-side. Three converter topologies with different conversion philosophies have been introduced (A, B and C), their performance examined and eventually compared with the conventional low voltage system. System A is a back-to-back MMC converter, which is commonly used in HVDC application. System B consists of the generator-side 2-level converter, DC/DC boost unit and a grid-side NPC-3L converter. System C is made of a seriesconnected full-bridge cells on the generator-side, and a grid-side NPC-5L converter. The performance of the proposed topologies is analyzed both under the normal and fault operation. In normal operation, medium and low voltage converter topologies are compared with regard to the efficiency and the required amount of silicon material in the semiconductor switches. In fault operation, maximum temporary ratings of the collector feeder components are compared also for different grounding schemes, which impact is the result of the removed step-up transformer. Finally, the ground fault detection scheme for feeder cable system is proposed - with the usage of current differential relay. Due to lack of the galvanic separation between the wind turbines and the feeder cable sections, careful investigation for the relay selective operation has been made, which distinguishes ground faults located at the wind turbine terminals from faults within the protected cables. The obtained results from the computer simulations in EMTDC/PSCAD software show, that the best performance has been achieved by the transformer-less turbine with a back-to-back modular multilevel converter (MMC) topology, which is single grounded only through its DC link common-mode point. It has also occurred that the results derived from losses and short circuit analyses have become advantageous over the equivalent conventional system consisting of low voltage wind turbines equipped with the step up transformer.

  13. Evaluation of high temperature dielectric films for high voltage power electronic applications

    Science.gov (United States)

    Suthar, J. L.; Laghari, J. R.

    1992-01-01

    Three high temperature films, polyimide, Teflon perfluoroalkoxy and poly-P-xylene, were evaluated for possible use in high voltage power electronic applications, such as in high energy density capacitors, cables and microelectronic circuits. The dielectric properties, including permittivity and dielectric loss, were obtained in the frequency range of 50 Hz to 100 kHz at temperatures up to 200 C. The dielectric strengths at 60 Hz were determined as a function of temperature to 250 C. Confocal laser microscopy was performed to diagnose for voids and microimperfections within the film structure. The results obtained indicate that all films evaluated are capable of maintaining their high voltage properties, with minimal degradation, at temperatures up to 200 C. However, above 200 C, they lose some of their electrical properties. These films may therefore become viable candidates for high voltage power electronic applications at high temperatures.

  14. Transient Voltage Overshoots of High Voltage ESD Protections Based on Bipolar Transistors in Smart Power Technology

    OpenAIRE

    Delmas, Antoine; Gendron, Amaury; Bafleur, Marise; Nolhier, Nicolas; Gill, Chai

    2010-01-01

    Transient voltage overshoots of a high voltage (20 V) ESD clamp based on bipolar transistors in a smart power technology are studied using different TLP pulse conditions (rise time, voltage amplitude). The physical mechanisms involved during the ESD clamp turn-on are thoroughly analyzed by the mean of TCAD simulations, allowing the definition of a set of design guidelines for the overshoot reduction.

  15. Integrated high-voltage inductive power and data-recovery front end dedicated to implantable devices.

    Science.gov (United States)

    Mounaim, F; Sawan, M

    2011-06-01

    In near-field electromagnetic links, the inductive voltage is usually much larger than the compliance of low-voltage integrated-circuit (IC) technologies used for the implementation of implantable devices. Thus most integrated power-recovery approaches limit the induced signal to low voltages with inefficient shunt regulation or voltage clipping. In this paper, we propose using high-voltage (HV) complementary metal-oxide semiconductor technology to fully integrate the inductive power and data-recovery front end while adopting a step-down approach where the inductive voltage is left free up to 20 or 50 V. The advantage is that excessive inductive power will translate to an additional charge that can be stored in a capacitor, instead of shunting to ground excessive current with voltage limiters. We report the design of two consecutive HV custom ICs-IC1 and IC2-fabricated in DALSA semiconductor C08G and C08E technologies, respectively, with a total silicon area (including pads) of 4 and 9 mm(2), respectively. Both ICs include HV rectification and regulation; however, IC2 includes two enhanced rectifier designs, a voltage-doubler, and a bridge rectifier, as well as data recovery. Postlayout simulations show that both IC2 rectifiers achieve more than 90% power efficiency at a 1-mA load and provide enough room for 12-V regulation at a 3-mA load and a maximum-available inductive power of 50 mW only. Successful measurement results show that HV regulators provide a stable 3.3- to 12-V supply from an unregulated input up to 50 or 20 V for IC1 and IC2, respectively, with performance that matches simulation results. PMID:23851479

  16. Novel high-voltage, high-side and low-side power devices with a single control signal

    International Nuclear Information System (INIS)

    Novel high-voltage, high-side and low-side power devices, whose control circuits are referred to as the tub, are proposed and investigated to reduce chip area and improve the reliability of high-voltage integrated circuits. By using the tub circuit to control a branch circuit consisting of a PMOS and a resistor, a pulse signal is generated to control the low-side n-LDMOS after being processed by a low-voltage circuit. Thus, the high-voltage level-shifting circuit is not needed any more, and the parasitic effect of the conventional level-shifting circuit is eliminated. Moreover, the specific on-resistance of the proposed low-side device is reduced by more than 14.3% compared with the conventional one. In the meantime, integrated low-voltage power supplies for the low-voltage circuit and the tub circuit are also proposed. Simulations are performed with MEDICI and SPICE, and the results show that the expectant functions are achieved well. (semiconductor devices)

  17. Power Supply For 25-Watt Arc Lamp

    Science.gov (United States)

    Leighty, B. D.

    1985-01-01

    Dual-voltage circuitry both strikes and maintains arc. New power supply designed (and several units already in use) that replaces relay/choke combination with solid-state starter. New power supply consists of two main sections. First section (low voltage power supply section) is 84-volt directcurrent supply. Second section (high-voltage starter circuit) is CockroftWalton voltage multiplier. Used as light sources for schlieren, shadowgraph, and other flow-visualization techniques.

  18. A high-voltage modulator for high-power RF source research

    International Nuclear Information System (INIS)

    This paper presents the design, construction, and operating results of a high-voltage modulator system capable of generating 700-kV, 2.5-?s pulses at 5 pps into a load of 900 ?. The modulator is used to energize a variety of high-power microwave devices requiring voltage stability and reproducibility. Voltage ripple is less than 0.2% during the 1.0-?s flat top, with a shot-to-shot voltage variation of less than 0.1%. The primary circuit consists of two seven-stage tunable Rayleigh- type pulse-forming networks (PFN's) connected in parallel with a total impedance of 2.25 ?, a total capacitance of 0.56 ?F, and a total inductance of 2.8 ?H. The PFN is charged by a highly stable 80-kV capacitor charging power supply (0.1% rms voltage ripple) at a rate of 10 kJ/s. The total energy stored (1.5 kJ) is released through an ITT F-187 thyratron into a 20:1 pulse transformer, which generates 700- kV, 2.5-1 ?s pulses. By changing the transformer, we have also obtained 250-kV, 1.7-kA pulses for driving low-impedance relativistic magnetron diodes. The flat-top voltage generated by the modulator is highly desirable for driving RF sources requiring high quality electron beams, such as free-electron lasers (FEL) and cyclotron auto-resonance masers (CARM). The modulator performance in our relativistic magnetron and CARM experiments is described

  19. The investigation of an electric arc in the long cylindrical channel of the powerful high-voltage AC plasma torch

    International Nuclear Information System (INIS)

    The comparison of conductivity obtained in experiments with calculated values is made in this paper. Powerful stationary plasma torches with prolonged period of continuous work are popular for modern plasmachemical applications. The maximum electrode lifetime with the minimum erosion can be reached while working on rather low currents. Meanwhile it is required to provide voltage arc drop for the high power achievement. Electric field strength in the arc column of the high-voltage plasma torch, using air as a plasma-forming gas, does not exceed 15 V/cm. It is possible to obtain the high voltage drop in the long arc stabilized in the channel by the intensive gas flow under given conditions. Models of high voltage plasma torches with rod electrodes with power up to 50 kW have been developed and investigated. The plasma torch arcs are burning in cylindrical channels. Present investigations are directed at studying the possibility of developing long arc plasma torches with higher power. The advantage of AC power supplies usage is the possibility of the loss minimization due to the reactive power compensation. The theoretical maximum of voltage arc drop for power supplies with inductive current limitations is about 50 % of the no-load voltage for a single-phase circuit and about 30 % for the three-phase circuit. Burning of intensively blown arcs in the long cylindrical channel using the AC power supply with 10 kV no-load voltage is experimentally investigated in the work. Vexperimentally investigated in the work. Voltage drops close to the maximum possible had been reached in the examined arcs in single-phase and three-phase modes. Operating parameters for single-phase mode were: current ?30 A, voltage drop ?5 kV, air flow rate 35 g/s; for three-phase mode: current (40–85) A, voltage drop (2.5–3.2) kV, air flow rate (60–100) g/s. Arc length in the installations exceeded 2 m.

  20. Test Results From a Simulated High-Voltage Lunar Power Transmission Line

    Science.gov (United States)

    Birchenough, Arthur; Hervol, David

    2008-01-01

    The Alternator Test Unit (ATU) in the Lunar Power System Facility (LPSF) located at the NASA Glenn Research Center (GRC) in Cleveland, Ohio was modified to simulate high-voltage transmission capability. The testbed simulated a 1 km transmission cable length from the ATU to the LPSF using resistors and inductors installed between the distribution transformers. Power factor correction circuitry was used to compensate for the reactance of the distribution system to improve the overall power factor. This test demonstrated that a permanent magnet alternator can successfully provide high-frequency ac power to a lunar facility located at a distance.

  1. Test Results from a Simulated High Voltage Lunar Power Transmission Line

    Science.gov (United States)

    Birchenough, Arthur; Hervol, David

    2008-01-01

    The Alternator Test Unit (ATU) in the Lunar Power System Facility (LPSF) located at the NASA Glenn Research Center (GRC) in Cleveland, OH was modified to simulate high voltage transmission capability. The testbed simulated a 1 km transmission cable length from the ATU to the LPSF using resistors and inductors installed between the distribution transformers. Power factor correction circuitry was used to compensate for the reactance of the distribution system to improve the overall power factor. This test demonstrated that a permanent magnet alternator can successfully provide high frequency AC power to a lunar facility located at a distance.

  2. Application of Solar Powered High Voltage Discharge Plasma for NOX Removal in Diesel Engine Exhaust

    OpenAIRE

    Das, Sayantani; Manaswini, P. V. S.; Kumari, Pooja; Mohapatro, S.; Rajanikanth, B. S.

    2011-01-01

    This paper proposes a compact electric discharge plasma source for controlling NOX emission in diesel engine exhaust. Boost converter is used to boost to solar powered battery voltage to 24V, further an automobile ignition coil was used to generate the high voltage pulse using fly-back topology. This design is aimed at retrofitting the existing catalytic converters with pulse assisted cleaning technique. In this paper we bring out a relative comparison of discharge plasma and plasma-adsorbent...

  3. Heavy-ion beams produced by high-voltage pulse-powered plasma focus

    International Nuclear Information System (INIS)

    We report preliminary experimental studies of heavy-ion beams produced by a new type of plasma focus device which is powered by a fast high-voltage pulse of approx.500 kV, approx.20 kA, and approx.50 ns. A variety of ion species, either from solid materials or gases, were obtained and their beam characteristics, including charge states, energy spectrum, and emittance, were measured

  4. High-frequency high-voltage high-power DC-to-DC converters

    Science.gov (United States)

    Wilson, T. G.; Owen, H. A.; Wilson, P. M.

    1982-01-01

    A simple analysis of the current and voltage waveshapes associated with the power transistor and the power diode in an example current-or-voltage step-up (buck-boost) converter is presented. The purpose of the analysis is to provide an overview of the problems and design trade-offs which must be addressed as high-power high-voltage converters are operated at switching frequencies in the range of 100 kHz and beyond. Although the analysis focuses on the current-or-voltage step-up converter as the vehicle for discussion, the basic principles presented are applicable to other converter topologies as well.

  5. Floridian high-voltage power-grid network partitioning and cluster optimization using simulated annealing

    CERN Document Server

    Hamad, Ibrahim Abou; Poroseva, Svetlana V

    2011-01-01

    Many partitioning methods may be used to partition a network into smaller clusters while minimizing the number of cuts needed. However, other considerations must also be taken into account when a network represents a real system such as a power grid. In this paper we use a simulated annealing Monte Carlo (MC) method to optimize initial clusters on the Florida high-voltage power-grid network that were formed by associating each load with its "closest" generator. The clusters are optimized to maximize internal connectivity within the individual clusters and minimize the power deficiency or surplus that clusters may otherwise have.

  6. Battery-Operated High-Voltage Power Supply

    Science.gov (United States)

    Ruitberg, A. P., Kennethm.

    1985-01-01

    Circuitry allows large multiplication of voltage. Filament voltage is -80kV. Potential difference between terminals P3 and P4 adjusted to make grid 80 to 150 volts more negative than filament enabling grid to focus electrons from filament into stream impinging on anode, which then emits x-rays. Circuitry provides independently adjustable voltages in kilovolt range for x-ray tubes and other instruments.

  7. Modular high-voltage bias generator powered by dual-looped self-adaptive wireless power transmission

    Science.gov (United States)

    Xie, Kai; Huang, An-Feng; Li, Xiao-Ping; Guo, Shi-Zhong; Zhang, Han-Lu

    2015-04-01

    We proposed a modular high-voltage (HV) bias generator powered by a novel transmitter-sharing inductive coupled wireless power transmission technology, aimed to extend the generator's flexibility and configurability. To solve the problems caused through an uncertain number of modules, a dual-looped self-adaptive control method is proposed that is capable of tracking resonance frequency while maintaining a relatively stable induction voltage for each HV module. The method combines a phase-locked loop and a current feedback loop, which ensures an accurate resonance state and a relatively constant boost ratio for each module, simplifying the architecture of the boost stage and improving the total efficiency. The prototype was built and tested. The input voltage drop of each module is less than 14% if the module number varies from 3 to 10; resonance tracking is completed within 60 ms. The efficiency of the coupling structure reaches up to 95%, whereas the total efficiency approaches 73% for a rated output. Furthermore, this technology can be used in various multi-load wireless power supply applications.

  8. Geomagnetically induced currents in Norway: the northernmost high-voltage power grid in the world

    OpenAIRE

    Myllys Minna; Viljanen Ari; Rui Øyvind August; Ohnstad Trond Magne

    2014-01-01

    We have derived comprehensive statistics of geomagnetic activity for assessing the occurrence of geomagnetically induced currents (GIC) in the Norwegian high-voltage power grid. The statistical study is based on geomagnetic recordings in 1994–2011 from which the geoelectric field can be modelled and applied to a DC description of the power grid to estimate GIC. The largest GIC up to a few 100 A in the Norwegian grid occur most likely in its southern parts. This follows primarily from the st...

  9. Comparison of charged nanoparticle concentrations near busy roads and overhead high-voltage power lines.

    Science.gov (United States)

    Jayaratne, E R; Ling, X; Morawska, L

    2015-09-01

    Overhead high-voltage power lines are known sources of corona ions. These ions rapidly attach to aerosols to form charged particles in the environment. Although the effect of ions and charged particles on human health is largely unknown, much attention has focused on the increasing exposure as a result of the expanding power network in urban residential areas. However, it is not widely known that a large number of charged particles in urban environments originate from motor vehicle emissions. In this study, for the first time, we compare the concentrations of charged nanoparticles near busy roads and overhead power lines. We show that large concentrations of both positive and negative charged nanoparticles are present near busy roadways and that these concentrations commonly exceed those under high-voltage power lines. We estimate that the concentration of charged nanoparticles found near two freeways carrying around 120 vehicles per minute exceeded the corresponding maximum concentrations under two corona-emitting overhead power lines by as much as a factor of 5. The difference was most pronounced when a significant fraction of traffic consisted of heavy-duty diesel vehicles which typically have high particle and charge emission rates. PMID:25917858

  10. High voltage-power frequency electrical heating in-situ conversion technology of oil shale

    Science.gov (United States)

    Sun, Youhong; Yang, Yang; Lopatin, Vladimir; Guo, Wei; Liu, Baochang; Yu, Ping; Gao, Ke; Ma, Yinlong

    2014-05-01

    With the depletion of conventional energy sources,oil shale has got much attention as a new type of energy resource,which is rich and widespread in the world.The conventional utilization of oil shale is mainly focused on resorting to produce shale oil and fuel gas with low extraction efficiency about one in a million due to many shortcomings and limitations.And the in-situ conversion of oil shale,more environmentally friendly,is still in the experimental stage.High voltage-power frequency electrical heating in-situ conversion of oil shale is a new type of in-situ pyrolysis technology.The main equipment includes a high voltage-power frequency generator and interior reactor. The high voltage-power frequency generator can provide a voltage between 220-8000 V which can be adjusted in real time according to the actual situation.Firstly,high voltage is used to breakdown the oil shale to form a dendritic crack between two electrodes providing a conductive channel inside the oil shale rock.And then the power frequency(220V) is used to generate the electric current for heating the internal surface of conductive channel,so that the energy can be transmitted to the surrounding oil shale.When the temperature reaches 350 degree,the oil shale begins to pyrolysis.In addition,the temperature in the conductive channel can be extremely high with high voltage,which makes the internal surface of conductive channel graphitization and improves its heat conduction performance.This technology can successfully make the oil shale pyrolysis, based on a lot of lab experiments,and also produce the combustible shale oil and fuel gas.Compared to other in-situ conversion technology,this method has the following advantages: high speed of heating oil shale,the equipment underground is simple,and easy to operate;it can proceed without the limitation of shale thickness, and can be used especially in the thin oil shale reservoir;the heating channel is parallel to the oil shale layers,which has more effective area for heating and heat transmitting;it has very good adaptability to the formation,the location and depth of the electrodes which can be adjusted according to the specific stratigraphic depth case;A positive(negative) electrode can be connected to multiple negative(positive) electrodes,and the arrangement of the positive and negative electrodes can be evaluated for improving the extraction efficiency.High voltage-power frequency electrical heating in-situ conversion technology is a very promising in-situ pyrolysis method,which could provide a new way of mining oil shale resources.

  11. Investigation of Electrical Potential and Electromagnetic Field for Overhead High Voltage Power Lines in Malaysia

    OpenAIRE

    Mokhtar, M.; Hitam, S.; Fauzi, S. A.; Sahbudin, R. K. Z.

    2010-01-01

    The exposure of human body to electric field and magnetic field could cause biological effects, including changes in functions of cells and tissues and subtle changes in hormone levels, which may or may not be harmful. The aim of this study was to analyze and compute the amount of electrical potential, electric field and magnetic flux density at a certain point and distance from the overhead high voltage power lines of 132 and 275 kV in Malaysia. An analytical calculus method is proposed in o...

  12. Modeling of Eddy Current losses of the high voltage winding of power transformers for transient studies

    International Nuclear Information System (INIS)

    One of the most suitable models for studying the electromagnetic transient behavior of the high voltage winding of the power transformers is the detailed model. This model consists of inductive and capacitive effects as well as the Eddy Current and dielectric losses in the form of lumped parameters. The losses have significant effects on the damping of transient over voltages. In this paper, the Eddy Current losses are expressed by a matrix which its elements satisfy the proximity effects and skin effects precisely. The matrix is calculated at low frequency by the finite element method and then generalized to the high frequencies. Simulations are presented for illustration and validation

  13. A high-voltage regulator used for long-pulse high-power microwave source

    International Nuclear Information System (INIS)

    A high-voltage regulator used for long-pulse and high-power microwave source of LHCD and ECRH on the HL-1M tokamak is introduced. The output parameters of the regulator, which utilized a domestic tetrode TM703F as modulator, are -70 kV/35kA. With the regulator, long-pulse LHCD up to 1s and LHCD with double klystrons have been carried out successfully on the HL-1M tokamak respectively. Even without a crowbar protection system, the regulator is stable and reliable for long period of operation by adopting a special fast protection method

  14. Audio-frequency noise emissions from high-voltage overhead power lines

    International Nuclear Information System (INIS)

    This article discusses the noise-emissions caused by high-voltage overhead power lines that can occur under certain atmospheric conditions. These emissions, caused by electric discharges around the conductors, can achieve disturbing values, depending on the conditions prevailing at the time in question. The causes of the discharges are examined and the ionisation processes involved are looked at. The parameters influencing the discharges are discussed and measures that can be taken to reduce such audio-frequency emissions are looked at. The authors note that a reduction of peripheral field strengths can reduce emissions and that hydrophilic coatings can lead to faster reduction of such effects after rainfall

  15. High voltage fast switches for nuclear applications

    International Nuclear Information System (INIS)

    SILVA process consists in a selective ionization of the 235 uranium isotope, using laser beams generated by dye lasers pumped by copper vapour laser (C.V.L.). SILVA involves power electronic for 3 power supplies: - copper vapour laser power supply, - extraction power supply to generate the electric field in the vapour, and - electron beam power supply for vapour generation. This article reviews the main switches that are proposed on the market or are on development and that could be used in SILVA power supplies. The SILVA technical requirements are: high power, high voltage and very short pulses (200 ns width). (A.C.)

  16. High voltage engineering

    CERN Document Server

    Rizk, Farouk AM

    2014-01-01

    Inspired by a new revival of worldwide interest in extra-high-voltage (EHV) and ultra-high-voltage (UHV) transmission, High Voltage Engineering merges the latest research with the extensive experience of the best in the field to deliver a comprehensive treatment of electrical insulation systems for the next generation of utility engineers and electric power professionals. The book offers extensive coverage of the physical basis of high-voltage engineering, from insulation stress and strength to lightning attachment and protection and beyond. Presenting information critical to the design, selec

  17. An evaluation of high voltage cable-coupler performance for underground mine power systems

    Energy Technology Data Exchange (ETDEWEB)

    Bise, C.; Morley, L.A.

    1982-07-01

    High voltage cable couplers are convenient and widely used accessories in modern coal-mine power distribution systems for aiding in the extension and retraction of power-feeder cables throughout a mine. Coupler design has tried to keep pace with the industry's desire to move to higher distribution levels, but the increase in recorded failures of 15 kV-class couplers, which serve the distribution levels of 12.47 kV and above, have inhibited this transition. The problems associated with high-voltage cable couplers are analyzed. Manufacturing, testing, and mounting practices are reviewed. A discussion of a coupler's operating environment is also included. On the basis of the aforementioned conditions, a testing standard is developed and various coupler designs are subjected to its requirements. An analysis of the test results is provided. Although new couplers can satisfy the performance requirements of the cables to which they are mounted, partial discharge appears to be the failure mechanism of concern. The effects of partial discharge are magnified where voids, either in the insulation, cable termination, or potting compound, occur. In this regard, it is shown that the quality of installation of a coupler onto cable is quite critical. By slightly altering the mounting procedure satisfactory partial-discharge readings are produced on a test coupler.

  18. High-Voltage Power Source on the Basis of Magnetocumulative Generator of the Type EMG-80

    Science.gov (United States)

    Boriskin, A. S.; Dimant, Ye. M.; Selemir, V. D.; Solov'yev, A. A.

    2004-11-01

    Some mathematical models and results of mathematical simulations of voltage source operation (high-voltage generator) consisting of a magneto-cumulative generator (MCG) and voltage multiplier are presented in this paper. A voltage multiplier is a device in which all voltages resulting from electric explosions of the conductors in separate inductive storage capacitors, connected in parallel to the MCG, are summed with the help of special switching. For numerical studies we chose the MCG with the EMG-80-type transfomer. It is in serial production, has a significant power capacity of 200 kJ and has a small volume of ~0.25 m3. Adaptability of this model for the analysis was confirmed with the experimental results. Calculations showed the possibility of obtaining megavolt voltage levels.

  19. Interconnected High-Voltage Pulsed-Power Converters System Design for H? Ion Sources

    CERN Document Server

    Aguglia, D

    2014-01-01

    This paper presents the design and experimental validations of a system of three new high-voltage (HV) pulsedpower converters for the H? sources. The system requires three pulsed voltages (50, 40, and 25 kV to ground) at 2-Hz repetition rate, for 700 ?s of usable flat-top. The solution presents ripplefree output voltages and minimal stored energy to protect the ion source from the consequences of arc events. Experimental results on the final full-scale prototype are presented. In case of short-circuit events, the maximal energy delivered to the source is in the Joule range. HV flat-top stability of 1% is experimentally achieved with a simple Proportional-Integral- Derivative regulation and preliminary tuned H? source (e.g., radio frequency control, gas injection, and so forth). The system is running since more than a year with no power converter failures and damage to the source.

  20. Marine High Voltage Power Conditioning and Transmission System with Integrated Storage DE-EE0003640 Final Report

    Energy Technology Data Exchange (ETDEWEB)

    Frank Hoffmann, PhD; Aspinall, Rik

    2012-12-10

    Design, Development, and test of the three-port power converter for marine hydrokinetic power transmission. Converter provides ports for AC/DC conversion of hydrokinetic power, battery storage, and a low voltage to high voltage DC port for HVDC transmission to shore. The report covers the design, development, implementation, and testing of a prototype built by PPS.

  1. Material science and device physics in SiC technology for high-voltage power devices

    Science.gov (United States)

    Kimoto, Tsunenobu

    2015-04-01

    Power semiconductor devices are key components in power conversion systems. Silicon carbide (SiC) has received increasing attention as a wide-bandgap semiconductor suitable for high-voltage and low-loss power devices. Through recent progress in the crystal growth and process technology of SiC, the production of medium-voltage (600–1700 V) SiC Schottky barrier diodes (SBDs) and power metal–oxide–semiconductor field-effect transistors (MOSFETs) has started. However, basic understanding of the material properties, defect electronics, and the reliability of SiC devices is still poor. In this review paper, the features and present status of SiC power devices are briefly described. Then, several important aspects of the material science and device physics of SiC, such as impurity doping, extended and point defects, and the impact of such defects on device performance and reliability, are reviewed. Fundamental issues regarding SiC SBDs and power MOSFETs are also discussed.

  2. A vacuum tolerant high voltage system with a low noise and low power Cockcroft–Walton photomultiplier base

    International Nuclear Information System (INIS)

    We developed a high voltage system for the electromagnetic calorimeter of the KOTO detector. The system is designed around a low noise, low power Cockcroft–Walton (CW) photomultiplier tube base with a high gain preamplifier. The low power makes it suitable for operations in vacuum. The low noise and high gain allow detecting signals in the 1 MeV range. We achieved a final noise level below 180?Vrms for a preamplifier gain of more than 40. A vacuum tolerant control system for the CW bases power distribution was also designed. This system is able to control and monitor the high voltage of each individual base

  3. SOI-Based High-Voltage, High-Temperature Integrated Circuit Gate Driver for SiC-Based Power FETs

    Energy Technology Data Exchange (ETDEWEB)

    Huque, Mohammad A [ORNL; Tolbert, Leon M [ORNL; Blalock, Benjamin [University of Tennessee, Knoxville (UTK); Islam, Syed K [University of Tennessee, Knoxville (UTK)

    2010-01-01

    Silicon carbide (SiC)-based field effect transistors (FETs) are gaining popularity as switching elements in power electronic circuits designed for high-temperature environments like hybrid electric vehicle, aircraft, well logging, geothermal power generation etc. Like any other power switches, SiC-based power devices also need gate driver circuits to interface them with the logic units. The placement of the gate driver circuit next to the power switch is optimal for minimizing system complexity. Successful operation of the gate driver circuit in a harsh environment, especially with minimal or no heat sink and without liquid cooling, can increase the power-to-volume ratio as well as the power-to-weight ratio for power conversion modules such as a DC-DC converter, inverter etc. A silicon-on-insulator (SOI)-based high-voltage, high-temperature integrated circuit (IC) gate driver for SiC power FETs has been designed and fabricated using a commercially available 0.8-m, 2-poly and 3-metal bipolar-complementary metal oxide semiconductor (CMOS)-double diffused metal oxide semiconductor (DMOS) process. The prototype circuit-s maximum gate drive supply can be 40-V with peak 2.3-A sourcing/sinking current driving capability. Owing to the wide driving range, this gate driver IC can be used to drive a wide variety of SiC FET switches (both normally OFF metal oxide semiconductor field effect transistor (MOSFET) and normally ON junction field effect transistor (JFET)). The switching frequency is 20-kHz and the duty cycle can be varied from 0 to 100-. The circuit has been successfully tested with SiC power MOSFETs and JFETs without any heat sink and cooling mechanism. During these tests, SiC switches were kept at room temperature and ambient temperature of the driver circuit was increased to 200-C. The circuit underwent numerous temperature cycles with negligible performance degradation.

  4. Problems on unification of high-voltage electron accelerators

    International Nuclear Information System (INIS)

    Problems of unification of high-voltage electron accelerators ''Electron-4'', ''Aurora'', and ''Aurora-2'' are considered. A description as well as principal specifications of unified accelerator systems are given: a high voltage source, radiator, cooling system, vacuum system, power supply system and accelerator control system. A level of electron accelerator standardization is shown. Methods of accelerator system elaboration are defined

  5. Field testing, modelling and analysis of ferroresonance in a high-voltage power system

    Science.gov (United States)

    Jacobson, David Allan Nils

    2000-11-01

    Catastrophic equipment failures continue to occur today due to ferroresonance even though this phenomenon has been extensively studied over the past ninety years. This thesis is concerned with the tasks of defining where ferroresonance problems can exist in a high voltage power system, of determining methods for displaying safety margins between nonferroresonant and ferroresonant operating regions and improving upon existing ferroresonance simulation techniques. Several different ferroresonant circuits have been modelled and compared with field measurements taken on the Manitoba Hydro 230-kV power system or compared with laboratory measurements including: a de-energized transformer connected to the grading capacitance of an open circuit breaker, a transformer-terminated doublecircuit transmission line and a coupling capacitor voltage transformer. In a high voltage power system, the most prevalent ferroresonance circuit occurs between a de-energized transformer and the grading capacitor of an open circuit breaker. Experimental work has shown that losses in a practical transformer are much larger during ferroresonance oscillation modes than predicted by conventional modelling techniques. A simple switched eddy-current loss resistor is found able to model the losses during subharmonic and fundamental frequency ferroresonance in a laboratory transformer. A major contribution of this work is a new method of visualizing the margin between nonferroresonant and ferroresonant states in a transformer/grading capacitor circuit has been developed. A general set of averaged equations is derived that permit the analysis of an nth order polynomial approximation of the magnetization curve. The location of the saddle points and slope of the stable manifold through the saddle points can be determined for a particular transformer under study. The Limacon of Pascal is found to be a good approximation to the geometric shape of the basin of attraction of the period-1 ferroresonant attractor and can be calculated using the saddle point location and slope of the stable manifold. The critical parameters resulting in a crossing of the separatrix can then be found by iteratively solving the Limacon equations. The new method will assist utility engineers in quickly assessing the potential risk of ferroresonance in their power system.

  6. Investigation of Electrical Potential and Electromagnetic Field for Overhead High Voltage Power Lines in Malaysia

    Directory of Open Access Journals (Sweden)

    M. Mokhtar

    2010-01-01

    Full Text Available The exposure of human body to electric field and magnetic field could cause biological effects, including changes in functions of cells and tissues and subtle changes in hormone levels, which may or may not be harmful. The aim of this study was to analyze and compute the amount of electrical potential, electric field and magnetic flux density at a certain point and distance from the overhead high voltage power lines of 132 and 275 kV in Malaysia. An analytical calculus method is proposed in order to accomplish this study. The models of the power lines were constructed using the actual physical dimensions of the towers. The results show that the exposure levels of the electromagnetic fields to the public is low if they stay more than 30 m away from the power lines. For the live-line worker, the exposure to the high electric and magnetic field could endanger their body if they stay too close to the conductor. The evaluations of the electrical potential, electric field strength and magnetic flux density are done using the Matlab environment. Matlab’s Graphical User Interface (GUI techniques are developed as an easy and user-friendly tool to be used.

  7. IGBT based solid state high voltage pulse power modulator for RF linacs

    International Nuclear Information System (INIS)

    Solid-state pulsed power modulators offer the promise of higher efficiency, longer life and compactness. This paper describes an IGBT based solid-state high voltage pulse power modulator developed for industrial RF linacs. The pulse modulator is required to generate a voltage pulse of about 10 ?s width, amplitude in the range 50kV to 100kV at a repetition rate in the range of 100-400 Hz and peak pulse current in the range 2-5 A, keeping rise time less than 1 ?s. Sharp rise time pulse ensures low divergence beam. One of the challenges in pulse power modulator is to reduce the rise time. This leads to choosing appropriate magnetic cores and novel techniques for winding so as to minimize inductance and capacitance of pulse transformer. A brief discussion of circuit topologies and solid-state devices is followed by the presentation of results of two prototype modulators one using locally available Mn-Zn ferrite core and other using kcp-30 metglass core of Russian origin. (author)

  8. Design and development of power supplies at VECC for accelerators

    International Nuclear Information System (INIS)

    Several power supplies have been designed and developed in-house incorporating various topologies to match the load requirements. Most of the power supplies have been being utilised in K-130 and K-500 cyclotrons operation successfully from last several years. Amongst other types, Switching Mode PS (SMPS), Phase Controlled Rectifier (PCR), Linear mode power supply are mostly in use, irrespective of their own merits and demerits. Switching mode power supply (SMPS) is most common topology for various applications ranging from high current to high voltage applications. Due to low stored energy and faster response, the SMPS incorporating Pulse Switch Modulation (PSM) configuration is most suitable for high voltage DC power supply at larger power compared to its counterparts, makes possible to operate the power system without crowbar. For an IOT cathode power supply, a 200kW at - 40kV High voltage power supply is under development incorporating SMPS and PSM technique. Earlier, High Voltage power supply was made by using Tetrode Tube in linear mode for RF amplifier for K-130 Cyclotron. Later, in K-500 Cyclotron, a High Voltage power supply was developed incorporating PCR topology rated at 20kV, 20 Amp for Anodes for 3 nos. of RF amplifiers. These HV power supply is equipped with ultra-fast acting Crowbar Protection System developed in VECC which is for the protection of costly RF Tubes against the internal arc. Design and development of SMPS based Bipolar Power Supply with 4-Quadrant operation rated at ± 27 V, ± 300 Amp with current stability around 100 ppm for Super-conducting Magnets along with quench protection and energy dumping scheme. (author)

  9. Geomagnetically induced currents in Norway: the northernmost high-voltage power grid in the world

    Directory of Open Access Journals (Sweden)

    Myllys Minna

    2014-03-01

    Full Text Available We have derived comprehensive statistics of geomagnetic activity for assessing the occurrence of geomagnetically induced currents (GIC in the Norwegian high-voltage power grid. The statistical study is based on geomagnetic recordings in 1994–2011 from which the geoelectric field can be modelled and applied to a DC description of the power grid to estimate GIC. The largest GIC up to a few 100 A in the Norwegian grid occur most likely in its southern parts. This follows primarily from the structure of the grid favouring large GIC in the south. The magnetic field has its most rapid variations on the average in the north, but during extreme geomagnetic storms they reach comparable values in the south too. The ground conductivity has also smaller values in the south, which further increases the electric field there. Additionally to results in 1994–2011, we performed a preliminary estimation of a once per 100 year event for geoelectric field by extrapolating the statistics. We found that the largest geoelectric field value would be twice the maximum in 1994–2011. Such value was actually reached on 13–14 July 1982.

  10. Modern Risk Assessment for Nuclear Power Plants High-Voltage Substations

    International Nuclear Information System (INIS)

    The paper describes a first Romanian attempt to set up the methodology for risk assessment and control within high-voltage substations, developed for the Nuclear power plant in Cernavoda (Romania). Considering the present risk assessment methods the MENER Project will develop a new methodology, in line with the European Community legislation and with the specific regional needs. In order to correctly shape the necessary resources required by a risk analysis a large size enterprise (a nuclear power plant) is selected and the following five indicators will be estimated: the economic profit, environmental risk, indirect (future) risk, technology improvement and physic and psychological risk. The results are expected to considerably facilitate risk assessment, by: evaluating project acceptability; evaluating equipment compliance to regulatory criteria; estimating excluding clearances; easing the design of emergency programmes; identifying the equipment use restrictions; identifying the risk sources; selecting the maintenance and risk reduction methods; testing the procedures leading to future regulatory norms; suitability of the risk management system modification. The immediate result of employing modern risk assessment methods could be the decrease by one third of the expenses required by environment protection, staff health and labor safety and quality management. (author)

  11. Game Changing Usage of High-Voltage Power Transmission Systems as Extremely Large Antennas for Space Physical and Geophysical Remote Imaging Project

    National Aeronautics and Space Administration — Geomagnetic storms drive geomagnetically induced currents (GIC) in high-voltage power transmission systems worldwide. GIC distribution in the transmission system is...

  12. High Power Amplifier and Power Supply

    Science.gov (United States)

    Duong, Johnny; Stride, Scot; Harvey, Wayne; Haque, Inam; Packard, Newton; Ng, Quintin; Ispirian, Julie Y.; Waian, Christopher; Janes, Drew

    2008-01-01

    A document discusses the creation of a high-voltage power supply (HVPS) that is able to contain voltages up to -20 kV, keep electrical field strengths to below 200 V/mil (approximately equal to 7.87 kV/mm), and can provide a 200-nanosecond rise/fall time focus modulator swinging between cathode potential of 16.3 kV and -19.3 kV. This HVPS can protect the 95-GHz, pulsed extended interaction klystron (EIK) from arcs/discharges from all sources, including those from within the EIK fs vacuum envelope. This innovation has a multi-winding pulse transformer design, which uses new winding techniques to provide the same delays and rise/fall times (less than 10 nanoseconds) at different potential levels ranging from -20 kV to -16 kV. Another feature involves a high-voltage printed-wiring board that was corona-free at -20 kV DC with a 3- kV AC swing. The corona-free multilayer high-voltage board is used to simulate fields of less than 200 V/mil (approximately equal to 7.87 kV/mm) at 20 kV DC. Drive techniques for the modulator FETs (field-effect transistors) (four to 10 in a series) were created to change states (3,000-V swing) without abrupt steps, while still maintaining required delays and transition times. The packing scheme includes a potting mold to house a ten-stage modulator in the space that, in the past, only housed a four-stage modulator. Problems keeping heat down were solved using aluminum oxide substrate in the high-voltage section to limit temperature rise to less than 10 while withstanding -20 kV DC voltage and remaining corona-free.

  13. Air ion mobility spectra and concentrations upwind and downwind of overhead AC high voltage power lines

    Science.gov (United States)

    Wright, Matthew D.; Buckley, Alison J.; Matthews, James C.; Shallcross, Dudley E.; Henshaw, Denis L.

    2014-10-01

    Corona ions produced by high-voltage power lines (HVPLs) can alter the nearby electrical environment, potentially increasing aerosol charge levels downwind. However, there is a lack of knowledge concerning the concentration and mobility of ions from AC HVPLs and their dispersion away from the line. We present ion concentration and mobility measurements made near AC HVPLs in South-West England. Examples of typical mobility spectra are shown highlighting features commonly observed. Corona was observed during 33 of 46 measurements, at 9 of 11 sites, with positive or ‘bipolar' (both polarities) ion production commonly seen. Ion production usually increases atmospheric concentrations by only a modest amount, but extreme cases can enhance concentration by an order of magnitude or more. A polarity imbalance is required to increase aerosol charge via ion attachment; this was observed on 15 of 24 days when positive corona was observed, but was not seen for negative ions. Ion mobility was higher downwind compared with upwind for both ion polarities, but the increase was not statistically significant. Future work should focus on identifying and characterising ‘heavy-producing' HVPLs, and obtaining results in conditions which may favour negative ion production e.g. high humidity, inclement weather or during nighttime.

  14. High Voltage Solar Array

    Science.gov (United States)

    Cho, Mengu

    In order to manage gigantic power of SSPS (Space Solar Power System) efficiently, use of extreme high voltage is necessary unless we minimize the transmission distance by employing a sandwich type of generator/transmitter panel. For 1 GW-class SSPS, the power transmission/generation voltage of 10 kV is necessary to keep the cable mass below a few hundred tons. To realize high voltage photovoltaic power generation, arcing caused by environmental interaction must be overcome. Three issues are reviewed. The first is degradation of solar cell performance due to repetitive arcing resulted from surface charging in GEO. The second is sustained arc phenomenon that may lead to catastrophic loss of significant portion of the total power. The third is micrometeoroid or space debris impact and resulting sustained arc. A design of high voltage solar array is proposed to prevent solar cell degradation due to repeated trigger arcs and sustained arc.

  15. The High Voltage Line Becomes a Power Distributor: A Successful Test in Congo Brazzaville

    Directory of Open Access Journals (Sweden)

    A. Omboua

    2006-03-01

    Full Text Available The high line voltage passes over the head but we don’t have electricity to have our mill functioned, we continue to live without the power! In many developing countries, we have a lot of high lines voltage which cross many regions to supply electricity to the main towns or connect to networks the distanced electric stations.These booked lines for supplying electricity to big towns cross a lot of villages whose people broadly poor hope to be supplied with electricity without a suitable solution. However it seems very deplorable that the power conducted by these lines doesn’t profit to surrounding population. Unfortunately, for these villages, the use of classical stations is too expensive to the power distributors because of high cost of investment and production for these potential scattered consumers with the feeble demand of electricity.This paper presents the original solution, settled in 2002 in one of the village located in Congo Brazzaville, and continues to function correctly. It is a new power transformer with one phase called PLX which is connected on one phase of the high line voltage 220kV and which produces extraordinary the low voltage 230 V directly useful by the rural population. This conceived sample for the rural electrification has been dimensioned for the power of 50kVA. A cheap and resistant advice! It requires a large popularization and mainly in sub saharian Africa that has got many opportunities. Outside the role of conduction of the power, the high line voltage distributes it

  16. A stable negative power supply for electron multipliers

    International Nuclear Information System (INIS)

    A simple, compact and stable high voltage negative power supply for electron multipliers, photomultipliers and similar devices, variable from 3 KV to 5 KV supplying a maximum current of 2 mA has been designed and developed. The short term stability is 0.01% at constant line and load parameters. The design and performance details have been discussed. (auth.)

  17. Childhood cancer and magnetic fields from high-voltage power lines in England and Wales: a case-control study.

    OpenAIRE

    Kroll, ME; Swanson, J.; Vincent, TJ; Draper, GJ

    2010-01-01

    BACKGROUND: Epidemiological evidence suggests that chronic low-intensity extremely-low-frequency magnetic-field exposure is associated with increased risk of childhood leukaemia; it is not certain the association is causal. METHODS: We report a national case-control study relating childhood cancer risk to the average magnetic field from high-voltage overhead power lines at the child's home address at birth during the year of birth, estimated using National Grid records. From the National Regi...

  18. Development of high voltage subsystem and components for 1 MW RF of LEHIPA

    International Nuclear Information System (INIS)

    Low energy high intensity proton accelerator (LEHIPA) at Bhabha Atomic Research Centre requires a total of around 2.9 MW of radio frequency (RF) power at 352.2 MHz. This RF power is generated by three klystron based high power RF systems. Each of this 1 MW RF system uses high voltage bias supplies that are floating at 100 kV for its operation. Some of the bias supplies have been designed and developed to operate in the CW and pulse mode. Major high voltage bias supplies are (-) 100 kV/20 A DC cathode supply and + 65 kV/10 mA (w.r.t cathode voltage) anode supply and a filament power supply floating at cathode voltage (-100 kV). The anode and filament supply have been developed indigenously whereas cathode supply is developed by IPR, Gandhinagar. An high voltage interface system is designed and developed indigenously to provide floating arrangements and additionally houses a fast acting crowbar, high voltage series resistors, insulating transformers (dry type), high voltage dumping switch with series dump resistor of 500 ohm, a high voltage multi-distribution box and high voltage probes (divider type) for HV measurement. All these components will be housed in one single insulated rack. This paper gives overview of development of all the high voltage subsystem, results achieved and evaluation. (author)

  19. Power supply for superconductor

    International Nuclear Information System (INIS)

    A new power supply for superconductor is proposed. The conventional power supply consists of a transformer and thyristors. The present power supply does not consist of the large current transformer but only the switching devices to achieve the DC current amplification. The principle of new power supply is AC-DC-AC-DC conversion. The AC line is once rectified to small current of DC and next converted to large current of DC through switching device handling AC. On a test set, 800 A of superconducting current has been obtained with 50 A input DC current. The conceptual design of power supply for 20 kA has been done. The characteristic features of the new power supply have been compared with the conventional one. (author)

  20. Switching power supply filter

    Science.gov (United States)

    Kumar, Prithvi R. (Inventor); Abare, Wayne (Inventor)

    1989-01-01

    A filter for a switching power supply. The filter includes a common mode inductor with coil configurations allowing differential mode current from a dc source to pass through but attenuating common mode noise from the power supply so that the noise does not reach the dc source. The invention also includes the use of feed through capacitors at the switching power supply input terminals to provide further high-frequency noise attenuation.

  1. Power supply arrangement for computerised tomographic apparatus

    International Nuclear Information System (INIS)

    In a rotating tomographic scanner it is possible to transfer the X-ray tube supply via slip rings. It is difficult to transfer high voltage for the tube by slip rings, yet if the mains supply is transferred the transformers required to give 70KV are excessively heavy for the gantry. It is proposed to transfer the power at 300V, high frequency and then to convert to 70KV on the gantry. The equipment then mounted on the gantry is evenly distributed there-around so that no further counterweight is required. A closed circuit oil cooling system is also provided on the gantry. (author)

  2. Magnetic fields of high voltage power lines and risk of cancer in Finnish adults: nationwide cohort study.

    OpenAIRE

    Verkasalo, P. K.; Pukkala, E.; Kaprio, J.; Heikkila?, K. V.; Koskenvuo, M.

    1996-01-01

    OBJECTIVE: To investigate the risk of cancer in association with magnetic fields in Finnish adults living close to high voltage power lines. DESIGN: Nationwide cohort study. SUBJECTS: 383,700 people who lived during 1970-89 within 500 metres of overhead power lines of 110-400 kV in a magnetic field calculated to be > or = 0.01 microT. Study subjects were identified by record linkages of nationwide registers. MAIN OUTCOME MEASURES: Numbers of observed and expected cases of cancer, standardised...

  3. MOS power transistor and ceramic thyratron for fast high voltage pulser

    International Nuclear Information System (INIS)

    A high reliability circuit has been developed in order to trigger a ceramic thyratron. The necessity of building a system highly protected from voltage and current glitches is due to the particular loads with are to be driven by the thyratron. In the circuit design, VMOS (both with 'p' or 'n' channel) and HEXFET transistors have been used. A delay time of about 60 ns between the NIM input signal and the thyratron grid voltage peak has been obtained. The delay between the NIM input signal and the thyratron trigger is about 80 ns. This apparatus has been developed in order to drive a high voltage pulse generator, used with a self-shunted streamer chamber. (orig.)

  4. Design and power management of an offshore medium voltage DC microgrid realized through high voltage power electronics technologies and control

    Science.gov (United States)

    Grainger, Brandon Michael

    The growth in the electric power industry's portfolio of Direct Current (DC) based generation and loads have captured the attention of many leading research institutions. Opportunities for using DC based systems have been explored in electric ship design and have been a proven, reliable solution for transmitting bulk power onshore and offshore. To integrate many of the renewable resources into our existing AC grid, a number of power conversions through power electronics are required to condition the equipment for direct connection. Within the power conversion stages, there is always a requirement to convert to or from DC. The AC microgrid is a conceptual solution proposed for integrating various types of renewable generation resources. The fundamental microgrid requirements include the capability of operating in islanding mode and/or grid connected modes. The technical challenges associated with microgrids include (1) operation modes and transitions that comply with IEEE1547 without extensive custom engineering and (2) control architecture and communication. The Medium Voltage DC (MVDC) architecture, explored by the University of Pittsburgh, can be visualized as a special type of DC microgrid. This dissertation is multi-faceted, focused on many design aspects of an offshore DC microgrid. The focal points of the discussion are focused on optimized high power, high frequency magnetic material performance in electric machines, transformers, and DC/DC power converters---all components found within offshore, power system architectures. A new controller design based upon model reference control is proposed and shown to stabilize the electric motor drives (modeled as constant power loads), which serve as the largest power consuming entities in the microgrid. The design and simulation of a state-of-the-art multilevel converter for High Voltage DC (HVDC) is discussed and a component sensitivity analysis on fault current peaks is explored. A power management routine is proposed and evaluated as the DC microgrid is disturbed through various mode transitions. Finally, two communication protocols are described for the microgrid---one to minimize communication overhead inside the microgrid and another to provide robust and scalable intra-grid communication. The work presented is supported by Asea Brown Boveri (ABB) Corporate Research Center within the Active Grid Infrastructure program, the Advanced Research Project Agency - Energy (ARPA-E) through the Solar ADEPT program, and Mitsubishi Electric Corporation (MELCO).

  5. Development of polymer insulators for electrical and high-voltage power lines with the application of radiation-chemical technology

    International Nuclear Information System (INIS)

    In the field of power engineering the problem of replacing traditional high-voltage porcelain and glass insulators by polymer insulators is being investigated. Polymers are desired which are relatively cheap and easy to process by molding. A copolymer of ethylene and vinyl acetate (EVA) filled aluminium hydroxide satisfys the requirements. In order to increase the heat stability of EVA, radiation-chemical technology was used in the present work. A pilot plant with a cobalt 60 radionuclide source was used as the source of ionizing radiation. The process of cross-linking EVA is described

  6. A High-Voltage Test Bed for the Evaluation of High-Voltage Dividers for Pulsed Applications

    CERN Document Server

    Bastos, M C; Hammarquist, M

    2011-01-01

    The design, evaluation, and commissioning of a high-voltage reference test bed for pulsed applications to be used in the precision testing of high-voltage dividers is described. The test bed is composed of a pulsed power supply, a reference divider based on compressed-gas capacitor technology, and an acquisition system that makes use of the fast measurement capabilities of the HP3458 digital voltmeter. The results of the evaluation of the reference system are presented.

  7. A High-voltage Reference Testbed for the Evaluation of High-voltage Dividers for Pulsed Applications

    CERN Document Server

    Bastos, M Cerqueira; Bergman, A

    2010-01-01

    The design, evaluation and commissioning of a high voltage reference testbed for pulsed applications to be used in the precision testing of high voltage dividers is described. The testbed is composed of a pulsed power supply, a reference divider based on compressed gas capacitor technology and an acquisition system which makes use of the fast measurement capabilities of the HP 3458 DVM. Results of the evaluation of the reference system are presented.

  8. An optically coupled power stimulus isolation unit with high voltage and fast rise time output

    Scientific Electronic Library Online (English)

    R.O., Brasil; J.H., Leal-Cardoso.

    1999-06-01

    Full Text Available Recent technological developments have created new devices that could improve and simplify the construction of stimulus isolators. HEXFET transistors can switch large currents and hundreds of volts in nanoseconds. The newer opto-isolators can give a pulse rise time of a few nanoseconds, with output [...] compatible with MOSFET devices, in which delays are reduced to nanoseconds. Integrated DC/DC converters are now available. Using these new resources we developed a new electrical stimulus isolator circuit with selectable constant-current and constant-voltage modes, which are precise and easy to construct. The circuit works like a regulated power supply in both modes with output switched to zero or to free mode through an opto-isolator device. The isolator analyses showed good practical performance. The output to ground resistance was 1011 ohms and capacitance 35 picofarads. The rise time and fall time were identical (5 µs) and constant. The selectable voltage or current output mode made it very convenient to use. The current mode, with higher output resistance values in low current ranges, permits intracellular stimulation even with tip resistances close to 100 megaohms. The high compliance of 200 V guarantees the value of the current stimulus. The very low output resistance in the voltage mode made the device highly suitable for extracellular stimulation with low impedance electrodes. Most importantly, these characteristics were achieved with a circuit that was easy to build and modify and assembled with components available in Brazil.

  9. An optically coupled power stimulus isolation unit with high voltage and fast rise time output

    Directory of Open Access Journals (Sweden)

    Brasil R.O.

    1999-01-01

    Full Text Available Recent technological developments have created new devices that could improve and simplify the construction of stimulus isolators. HEXFET transistors can switch large currents and hundreds of volts in nanoseconds. The newer opto-isolators can give a pulse rise time of a few nanoseconds, with output compatible with MOSFET devices, in which delays are reduced to nanoseconds. Integrated DC/DC converters are now available. Using these new resources we developed a new electrical stimulus isolator circuit with selectable constant-current and constant-voltage modes, which are precise and easy to construct. The circuit works like a regulated power supply in both modes with output switched to zero or to free mode through an opto-isolator device. The isolator analyses showed good practical performance. The output to ground resistance was 1011 ohms and capacitance 35 picofarads. The rise time and fall time were identical (5 µs and constant. The selectable voltage or current output mode made it very convenient to use. The current mode, with higher output resistance values in low current ranges, permits intracellular stimulation even with tip resistances close to 100 megaohms. The high compliance of 200 V guarantees the value of the current stimulus. The very low output resistance in the voltage mode made the device highly suitable for extracellular stimulation with low impedance electrodes. Most importantly, these characteristics were achieved with a circuit that was easy to build and modify and assembled with components available in Brazil.

  10. Influence of a pulse duration of high-voltage supply on the efficiency of ozone synthesis in the 'needle-plane' electrode system

    International Nuclear Information System (INIS)

    We present the results of studies of the electrodynamic characteristics of a barrier less discharge with electrodes of the 'needle-plane' type and a high-voltage pulse of positive polarity, being applied to the edge electrode. The efficiency of ozone synthesis is determined as a function of the pulse duration and repetition rate. It is shown that the electrodynamic characteristics of the discharge and the effectiveness of ozone synthesis in oxygen-containing gas mixtures essentially depend on the parameters of the pulse supply

  11. SNS Standard Power Supply Interface

    OpenAIRE

    Peng, S.; Lambiase, R.; Oerter, B.; Smith, J.

    2001-01-01

    The SNS has developed a standard power supply interface for the approximately 350 magnet power supplies in the SNS accumulator ring, Linac and transport lines. Power supply manufacturers are providing supplies compatible with the standard interface. The SNS standard consists of a VME based power supply controller module (PSC) and a power supply interface unit (PSI) that mounts on the power supply. Communication between the two is via a pair of multimode fibers. This PSI/PSC ...

  12. Tuning magnet power supply

    International Nuclear Information System (INIS)

    The particles in a Rapid Cycling Accelerator are accelerated by RF cavities, which are tuned by DC biased ferrite cores. The tuning is achieved by the regulation of bias current, which is produced by a power supply. The tuning magnet power supply utilizes a bridge circuit, supplied by a three phase rectifier. During the rise of the current, when the particles are accelerated, the current is controlled with precision by the bridge which operates as a power amplifier. During the fall of the current, the bridge operates in a switching mode and recovers the energy stored in the ferrites. The recovered energy is stored in a capacitor bank. The bridge circuit is built with 150 power transistors. The drive, protection and control circuit were designed and built from commercial component. The system will be used for a RF cavity experiment in Los Alamos and will serve as a prototype tuning power supply for future accelerators. 1 ref., 7 figs

  13. Tuning magnet power supply

    International Nuclear Information System (INIS)

    The particles in a Rapid Cycling Accelerator are accelerated by rf cavities, which are tuned by dc biased ferrite cores. The tuning is achieved by the regulation of bias current, which is produced by a power supply. The tuning magnet power supply utilizes a bridge circuit, supplied by a three phase rectifier. During the rise of the current, when the particles are accelerated, the current is controlled with precision by the bridge which operates a power amplifier. During the fall of the current, the bridge operates in a switching mode and recovers the energy stored in the ferrites. The recovered energy is stored in a capacitor bank. The bridge circuit is built with 150 power transistors. The drive, protection and control circuit were designed and built from commercial component. The system will be used for a rf cavity experiment in Los Alamos and will serve as a prototype tuning power supply for future accelerators. 1 ref., 7 figs

  14. Lifting BLS Power Supplies

    International Nuclear Information System (INIS)

    This note describes BLS power supplies lifting techniques and provides stress calculations for lifting plate and handles bolts. BLS power supply weight is about 120 Lbs, with the center of gravity shifted toward the right front side. A lifting plate is used to attach a power supply to a crane or a hoist. Stress calculations show that safety factors for lifting plate are 12.9 (vs. 5 required) for ultimate stress and 5.7 (vs. 3 required) for yield stress. Safety factor for shackle bolt thread shear load is 37, and safety factor for bolts that attach handles is 12.8.

  15. Optimized control strategy for crowbarless solid state modular power supply

    International Nuclear Information System (INIS)

    Solid state modular power supply with series connected IGBT based power modules have been employed as high voltage bias power supply of klystron amplifier. Auxiliary compensation of full wave inverter bridge with ZVS/ZCS operations of all IGBTs over entire operating range is incorporated. An optimized control strategy has been adopted for this power supply needing no output filter, making this scheme crowbarless and is presented in this paper. DSP based fully digital control with same duty cycle for all power modules, have been incorporated for regulating this power supply along with adequate protection features. Input to this power supply is taken directly from 11 kV line and the input system is intentionally made 24 pulsed to reduce the input harmonics, improve the input power factor significantly, there by requiring no line filters. Various steps have been taken to increase the efficiency of major subsystems, so as to improve the overall efficiency of this power supply significantly. (author)

  16. High Voltage Seismic Generator

    Science.gov (United States)

    Bogacz, Adrian; Pala, Damian; Knafel, Marcin

    2015-04-01

    This contribution describes the preliminary result of annual cooperation of three student research groups from AGH UST in Krakow, Poland. The aim of this cooperation was to develop and construct a high voltage seismic wave generator. Constructed device uses a high-energy electrical discharge to generate seismic wave in ground. This type of device can be applied in several different methods of seismic measurement, but because of its limited power it is mainly dedicated for engineering geophysics. The source operates on a basic physical principles. The energy is stored in capacitor bank, which is charged by two stage low to high voltage converter. Stored energy is then released in very short time through high voltage thyristor in spark gap. The whole appliance is powered from li-ion battery and controlled by ATmega microcontroller. It is possible to construct larger and more powerful device. In this contribution the structure of device with technical specifications is resented. As a part of the investigation the prototype was built and series of experiments conducted. System parameter was measured, on this basis specification of elements for the final device were chosen. First stage of the project was successful. It was possible to efficiently generate seismic waves with constructed device. Then the field test was conducted. Spark gap wasplaced in shallowborehole(0.5 m) filled with salt water. Geophones were placed on the ground in straight line. The comparison of signal registered with hammer source and sparker source was made. The results of the test measurements are presented and discussed. Analysis of the collected data shows that characteristic of generated seismic signal is very promising, thus confirms possibility of practical application of the new high voltage generator. The biggest advantage of presented device after signal characteristics is its size which is 0.5 x 0.25 x 0.2 m and weight approximately 7 kg. This features with small li-ion battery makes constructed device very mobile. The project is still developing.

  17. Measurements and high voltage tests on power transformers on-site. Mobile measurement and testing technology; Hochspannungspruefungen an Leistungstransformatoren vor Ort. Mobile Mess- und Prueftechnik

    Energy Technology Data Exchange (ETDEWEB)

    Werle, Peter; Steiger, Matthias; Szczechowski, Janusz [ABB, Halle (Germany); Krueger, Michael; Kraetge, Alexander; Koch, Maik; Rethmeier, Kay [Omicron Electronics GmbH, Klaus (Austria)

    2009-02-16

    In order to gather knowledge about the reliability of power transformers it is necessary to analyse their condition. Beyond laboratory tests on the transformer's insulation liquid electrical analytic methods are used. Some of them do not need much effort to be done on-site, others need high voltages, which can be applied by using transportable high-voltage sources. If repairs are made on-site, the quality of the repair has to be proven by the common standard measurements and high-voltage tests. (orig.)

  18. Protection relay of phase-shifting device with thyristor switch for high voltage power transmission lines

    Science.gov (United States)

    Lachugin, V. F.; Panfilov, D. I.; Akhmetov, I. M.; Astashev, M. G.; Shevelev, A. V.

    2014-12-01

    Problems of functioning of differential current protection systems of phase shifting devices (PSD) with mechanically changed coefficient of transformation of shunt transformer are analyzed. Requirements for devices of protection of PSD with thyristor switch are formulated. Based on use of nonlinear models of series-wound and shunt transformers of PSD modes of operation of major protection during PSD, switching to zero load operation and to operation under load and during short circuit operation were studied for testing PSD with failures. Use of the principle of duplicating by devices of differential current protection (with realization of functions of breaking) of failures of separate pares of PSD with thyristor switch was substantiated. To ensure protection sensitivity to the shunt transformer winding short circuit, in particular, to a short circuit that is not implemented in the current differential protection for PSD with mechanical switch, the differential current protection reacting to the amount of primary ampere-turns of high-voltage and low-voltage winding of this transformer was designed. Studies have shown that the use of differential current cutoff instead of overcurrent protection for the shunt transformer wndings allows one to provide the sensitivity during thyristor failure with the formation of a short circuit. The results of simulation mode for the PSD with switch thyristor designed to be installed as switching point of Voskhod-Tatarskaya-Barabinsk 220 kV transmission line point out the efficiency of the developed solutions that ensure reliable functioning of the PSD.

  19. Analysis of transistor and snubber turn-off dynamics in high-frequency high-voltage high-power converters

    Science.gov (United States)

    Wilson, P. M.; Wilson, T. G.; Owen, H. A., Jr.

    1982-01-01

    Dc to dc converters which operate reliably and efficiently at switching frequencies high enough to effect substantial reductions in the size and weight of converter energy storage elements are studied. A two winding current or voltage stepup (buck boost) dc-to-dc converter power stage submodule designed to operate in the 2.5-kW range, with an input voltage range of 110 to 180 V dc, and an output voltage of 250 V dc is emphasized. In order to assess the limitations of present day component and circuit technologies, a design goal switching frequency of 10 kHz was maintained. The converter design requirements represent a unique combination of high frequency, high voltage, and high power operation. The turn off dynamics of the primary circuit power switching transistor and its associated turn off snubber circuitry are investigated.

  20. High Voltage Generation for Physics Lab

    OpenAIRE

    Baddi, Raju

    2012-01-01

    A power efficient way to generate low power high voltage is given. The article describes various aspects of functioning and derives quantitative relations between different parameters and high voltage generated. Use of voltage multiplier (Cockcroft-Walton multiplier) network can provide further boost in the high voltage(~1000V).

  1. Mobile Uninterruptible Power Supply

    Science.gov (United States)

    Mears, Robert L.

    1990-01-01

    Proposed mobile unit provides 20 kVA of uninterruptible power. Used with mobile secondary power-distribution centers to provide power to test equipment with minimal cabling, hazards, and obstacles. Wheeled close to test equipment and system being tested so only short cable connections needed. Quickly moved and set up in new location. Uninterruptible power supply intended for tests which data lost or equipment damaged during even transient power failure.

  2. Radioisotope Power Supply Project

    National Aeronautics and Space Administration — Between 1998 and 2003, Hi-Z Technology developed and built a 40 mW radioisotope power supply (RPS) that used a 1 watt radioisotope heater unit (RHU) as the energy...

  3. Optimal Voltage Control of the Southern Norwegian Power Grid : Mixed Integer Nonlinear Programming (MINLP) for Control and Optimization of the High Voltage Southern Norwegian Power Grid

    OpenAIRE

    Hannisdal, Erik Lundegaard

    2011-01-01

    This thesis contains the synthesis, analysis and simulation results of an automatic optimal voltage controller for the Southern Norwegian power grid. Currently the high voltage power grid is controlled manually by operators switching control components. The optimal controller handles the voltage control of the system, as well as keeping the number of control actions to a minimum.The system model is derived from power system analysis. Due to a highy nonlinear system model and integer decission...

  4. Experimental investigation of high temperature high voltage thermionic diode for the space power nuclear reactor

    International Nuclear Information System (INIS)

    It is well known that the rise of arc from the dense glow discharge is connected with the thermion and secondary processes on the cathode surface (Granovsky, 1971; Leob, 1953; Engel, 1935). First model of breakdown of the cathode layer is connected with the increase of the cathode temperature in consequence of the ion bombardment that leads to the grows its thermo-emissive current. Other model shows the main role of the secondary effects on the cathode surface-the increase of the secondary ion emission coefficient--?i with the grows of glow discharge voltage. But the author of this investigation work of breakdown in Cs vapor (a transmission the glow discharge into self-maintaining arc discharge) discovered the next peculiarity: the value of breakdown voltage is constant when the values of vapor temperature (its pressure pcs) and cathode temperature Tk is constant too (Ub=constant with Tk=constant and pcs=constant) and it is not a statistical value (Onufryev, Grishin, 1996) (that was observed in gas glow discharges other authors (Granovsky, 1971; Leob, 1953; Engel, 1935)). The investigations of thermion high voltage high temperature diode (its breakdown characteristics in closed state and voltage-current characteristics in disclosed state) showed that the value of the breakdown voltage is depended on the vapor pressure in inter-electrode gap (IEG)-pcs and cathode temperature-Tk andand cathode temperature-Tk and is independent on IEG length--?ieg. On this base it was settled that the main role in transition of glow discharge to self-maintaining arc discharge plays an ion cathode layer but more exactly--the region of excited atoms--''Aston glow.''

  5. On-chip High-Voltage Generator Design

    CERN Document Server

    Tanzawa, Toru

    2013-01-01

    This book describes high-voltage generator design with switched-capacitor multiplier techniques.  The author provides various design techniques for switched-capacitor on-chip high-voltage generators, including charge pump circuits, regulators, level shifters, references, and oscillators.  Readers will see these techniques applied to system design in order to address the challenge of how the on-chip high-voltage generator is designed for Flash memories, LCD drivers, and other semiconductor devices to optimize the entire circuit area and power efficiency with a low voltage supply, while minimizing the cost.   ·         Shows readers how to design charge pump circuits with lower voltage operation, higher power efficiency, and smaller circuit area; ·         Describes comprehensive circuits and systems design of on-chip high-voltage generators; ·         Covers all the component circuit blocks, including charge pumps, pump regulators, level shifters, oscillators, and references.

  6. Programmable Multiple-Ramped-Voltage Power Supply

    Science.gov (United States)

    Ajello, Joseph M.; Howell, S. K.

    1993-01-01

    Ramp waveforms range up to 2,000 V. Laboratory high-voltage power-supply system puts out variety of stable voltages programmed to remain fixed with respect to ground or float with respect to ramp waveform. Measures voltages it produces with high resolution; automatically calibrates, zeroes, and configures itself; and produces variety of input/output signals for use with other instruments. Developed for use with ultraviolet spectrometer. Also applicable to control of electron guns in general and to operation of such diverse equipment used in measuring scattering cross sections of subatomic particles and in industrial electron-beam welders.

  7. The usage of OPGW in power transmission lines of the Macedonian high voltage network

    International Nuclear Information System (INIS)

    This report generally deals with the experiences in ESM (Electric Power Co. of Macedonia) with the usage of OPGW in power transmission lines. Also, the key issues that influence to the decisions in evaluating both the options and criteria important in future implementation of optical fibre on power lines with different voltage levels are described. (Original)

  8. Switch mode power supply

    International Nuclear Information System (INIS)

    This book concentrates on switch mode power supply. It has four parts, which are introduction of switch mode power supply with DC-DC converter such as Buck converter boost converter, Buck-boost converter and PWM control circuit, explanation for SMPS with DC-DC converter modeling and power mode control, resonance converter like resonance switch, converter, multi resonance converter and series resonance and parallel resonance converters, basic test of SMPS with PWM control circuit, Buck converter, Boost converter, flyback converter, forward converter and IC for control circuit.

  9. Contemporary Power Supplies

    Science.gov (United States)

    Created by Work-Ready Electronics, a project of the Advanced Technological Education program, this module walks visitors through the basics of contemporary power supplies. The content of the site is divided into seven areas: contemporary power supply technology, SMPS technology, architecture and operation, discrete devices and SMPS performance, improving efficiency, power supply architectures, power management and digital control in SMPS. There is a quiz for each in the Knowledge Probe area, and the Learning Resources section contains two activities to help cement student understanding. There are also further resources - both print and Web based - for more information and two Questors, a Flash trivia game. The Notebook function allows visitors to take notes and review them at any time. This is an excellent resource students and educators in electronics technician programs.

  10. Research and development of high voltage linear fiber isolation system

    International Nuclear Information System (INIS)

    In the high voltage power supply system, signals should be insulated and transmitted between the high voltage circuit and measurement control system. The fiber isolation system not only satisfies the requirements of high voltage isolation but also has excellent ability against the electromagnetic disturbance. Two methods, which are adopted to insulate and transmit the analog signal in high power system by fiber, are introduced, and the configuration of isolation transmission system and design scheme of analog signal isolation transmission are explained. The experiment results show that the analog signal can be insulated and transmitted well between the high potential power supply circuit and its measurement circuits, because the emitter of this fiber is olation system works in its linearity range. (authors)

  11. High-Voltage Square-Wave Generator

    Science.gov (United States)

    Bernius, Mark T.; Chutjian, Ara

    1990-01-01

    Fast switching circuit puts out rectangular pulses of order of kilovolt or greater at typical repetition frequencies as high as hundreds of kilohertz and with rise times as short as 50 ns. Designed around power metal oxide/semiconductor field-effect transistors (MOSFET's). Optically isolated power MOSFET's in series rapidly switch output between high voltages V(sub 1) and V(sub 2). Used to supply power to pulsed laser or to modulate beam of charged particles in laboratory experiment or industrial process.

  12. Allowance for insulation aging in the new concept of accelerated life tests of high-voltage power transformers

    International Nuclear Information System (INIS)

    This paper reports that the existing system of type and acceptance tests of high-voltage transformer insulation does not take into account insulation ageing, which is particularly objectionable with respect to equip-met with reduced insulation levels. Suggested in the paper is a new concept of accelerated life tests based on integrated simulation of basic operating loads, both periodic (surge) and long-term ones; by making a long-term accelerated test simulating the working conditions, with exposure of test object and/or its insulation to periodic operating surges (overvoltages and overcurrents). This test replaces a group of conventional individual acceptance tests and provides more ample and more precise information on performance and dependability of the equipment. The test procedure was checked in test of a small lot of 1600 kVA 35 kV power transformers

  13. Design of a system of high voltage pulsed power converters for CERN’s Linac4 H$^{?}$ ion source

    CERN Document Server

    Aguglia, D

    2014-01-01

    This paper presents the complete design and experimental validations of the full scale prototype of a system of three new high voltage pulsed power converters for the CERN Linac4 H$^{?}$ source. The system requires three pulsed voltages (50kV, 40kV and 25kV to ground) at 2Hz repetition rate, for a 700µs of usable flat-top. The solution presents switching frequency ripplefree voltages and a minimal stored energy to protect the ions source from arc events consequences. The main design aspects are presented. Experimental results on the final full-scale prototype are presented and show excellent behaviour in nominal and short circuit operations.

  14. Influence of the topology on the power flux of the Italian high-voltage electrical network

    CERN Document Server

    Rosato, V; Gianese, G; Bologna, S

    2009-01-01

    A model of the Italian 380 kV electrical transmission network has been analyzed under the topological and the functional viewpoints. The DC power flow model used to evaluate the power flux has been solved on the basis of input conditions (injected power - extracted power, line's reactances and the maximum flux capacity of each line) taken from real data. The vulnerability of the network under load conditions has been estimated by evaluating the power flux redistribution along the lines subsequent to line's removal. When the perturbed network cannot sustain a given input--output demand, the maximum power sustainable by the network has been evaluated to optimize the \\texttt{Quality of Service}, defined as the difference between the expected and the effective dispatched power. The functional relevance of the different lines of the network has been classified according to the amount of power that the network must reduce, to keep alive, upon their removal. Results show that topological and functional relevances ar...

  15. Development of method for detecting signs deterioration in insulator of high-voltage motors. 2. Test Results of a new on-line partial discharge monitor for high-voltage motors in nuclear power stations

    International Nuclear Information System (INIS)

    For the purpose of early detection of deterioration of insulators in high-voltage motors which are widely utilized in nuclear power stations, a new on-line partial discharge (PD) monitor was developed and was tested for sixteen motors which were practically running in nuclear power stations. From the test results, it is seen that (1) good signal to noise ratio is obtained by adopting a two frequency correlation method, (2) a resistance temperature detector (RTD) in a motor has sufficient sensitivity to detect PD, (3) when RTD is not installed or is unable to use for this purpose, a radio frequency current transformer (RFCT) can be utilized, although its sensitivity is about 1/10 of that of the RTD monitor. Finally we found a good correlation between the results of this on-line method and the conventional off-line method in which the insulator resistance of a concerned motor was measured during its shut-down, and thereby we demonstrated that this method could be applicable to the on-line test of high-voltage motors in nuclear power stations. (author)

  16. Silicon-on-insulator-based high-voltage, high-temperature integrated circuit gate driver for silicon carbide-based power field effect transistors

    Energy Technology Data Exchange (ETDEWEB)

    Tolbert, Leon M [ORNL; Huque, Mohammad A [ORNL; Blalock, Benjamin J [ORNL; Islam, Syed K [ORNL

    2010-01-01

    Silicon carbide (SiC)-based field effect transistors (FETs) are gaining popularity as switching elements in power electronic circuits designed for high-temperature environments like hybrid electric vehicle, aircraft, well logging, geothermal power generation etc. Like any other power switches, SiC-based power devices also need gate driver circuits to interface them with the logic units. The placement of the gate driver circuit next to the power switch is optimal for minimising system complexity. Successful operation of the gate driver circuit in a harsh environment, especially with minimal or no heat sink and without liquid cooling, can increase the power-to-volume ratio as well as the power-to-weight ratio for power conversion modules such as a DC-DC converter, inverter etc. A silicon-on-insulator (SOI)-based high-voltage, high-temperature integrated circuit (IC) gate driver for SiC power FETs has been designed and fabricated using a commercially available 0.8--m, 2-poly and 3-metal bipolar-complementary metal oxide semiconductor (CMOS)-double diffused metal oxide semiconductor (DMOS) process. The prototype circuit-s maximum gate drive supply can be 40-V with peak 2.3-A sourcing/sinking current driving capability. Owing to the wide driving range, this gate driver IC can be used to drive a wide variety of SiC FET switches (both normally OFF metal oxide semiconductor field effect transistor (MOSFET) and normally ON junction field effect transistor (JFET)). The switching frequency is 20-kHz and the duty cycle can be varied from 0 to 100-. The circuit has been successfully tested with SiC power MOSFETs and JFETs without any heat sink and cooling mechanism. During these tests, SiC switches were kept at room temperature and ambient temperature of the driver circuit was increased to 200-C. The circuit underwent numerous temperature cycles with negligible performance degradation.

  17. Power supply and ethics

    International Nuclear Information System (INIS)

    The 'Power Supply and Ethics' workshop was designed on the basis of a recommendation by the Nuclear Technology Committee (FA-KT) of VDI-GET. The topic is part of a series of events and publications by VDI in an area where engineering and the humanities converge. The Workshop comprised presentations and thorough discussions of seven papers on 'Power Supply and Ethics', reflecting a variety of contents and points of view of the different disciplines participating. The Workshop offered another opportunity to take the initiative and influence the public, especially politics. Other activities are planned which also the participants increasingly consider an obligation to the public. (orig.)

  18. Additional heating power supplies: Design concept and first operation

    International Nuclear Information System (INIS)

    Two additional heating methods are used in JET, e.g. the Neutral Injection (NI heating) and the Ion Cyclotron Resonance Heating (RF Heating). In the RF heating, 10 generators each deliver 3MW to their antenna; for the NI heating 16 ion sources each delivering 4.8MW ion beam are installed. In order to minimize the internal dissipation in the generator and hence to obtain the maximum output power of the RF generators under the varying load conditions given by the plasma, the high voltage on the anode of the tetrode is varied. This is one of the main features of the power supply. The requirements for the NI power supply are different to the ones for the RF power supply. The accelerating grid (G1) power supply has to be very stable and must be able to switch off in 10 microsec in case of a breakdown in the accelerating structure and re-apply within 50 ms. Both these functions, voltage regulation and switching on and off are performed by a high power tetrode (protection system). In addition to the accelerating grid power supply, other power supplies (Aux PS) are necessary. They are the arc power supply, the filament power supply, the suppression grid (G3) power supply, the gradient grid (G2) power supply and the bending magnet power supply

  19. Hold-up power supply for flash memory

    Science.gov (United States)

    Ott, William E. (Inventor)

    2004-01-01

    A hold-up power supply for flash memory systems is provided. The hold-up power supply provides the flash memory with the power needed to temporarily operate when a power loss exists. This allows the flash memory system to complete any erasures and writes, and thus allows it to shut down gracefully. The hold-up power supply detects when a power loss on a power supply bus is occurring and supplies the power needed for the flash memory system to temporally operate. The hold-up power supply stores power in at least one capacitor. During normal operation, power from a high voltage supply bus is used to charge the storage capacitors. When a power supply loss is detected, the power supply bus is disconnected from the flash memory system. A hold-up controller controls the power flow from the storage capacitors to the flash memory system. The hold-up controller uses feedback to assure that the proper voltage is provided from the storage capacitors to the flash memory system. This power supplied by the storage capacitors allows the flash memory system to complete any erasures and writes, and thus allows the flash memory system to shut down gracefully.

  20. Engineering Design of the ITER AC/DC Power Supplies

    International Nuclear Information System (INIS)

    To design high power pulse power supplies, especially in huge power supplies have not designed till now, it is necessary to analyze a system's characteristics and relations with another systems as well as to know high voltage, high current control technologies. Contents of this project are; - Study for the engineering designs changed recently by ITER Organization(IO) and writing specifications for the power supplies to reduce project risk. - Detailed analysis of the AC/DC Converters and writing subtask reports on the Task Agreement. - Study for thyristor numbers, DCR's specifications for Korea-China sharing meetings. - Study for the grounding systems of the ITER power supply system. The results may used as one of reference for practical designs of the high power coil power supplies and also may used in various field such as electroplating, plasma arc furnaces, electric furnaces

  1. High voltage direct current (HVDC) link between the power networks of Italy and Greece

    International Nuclear Information System (INIS)

    Interconnection between the power networks of Italy and Greece has long been declared of European interest. The link, which will directly connect Greece with the power network of UCPTE, is perfectly in line with the targets of the European Union in terms of trans-European power networks. The interconnection, which benefits of a financial contribution of the EU, will rely on a 400 kV d.c. transmission system with one submarine cable between the Italian and Greek coasts, overhead lines on land, d.c./a.c. conversion stations, return of current to sea via marine electrodes. The main technical features of the project are described, highlighting its most significant design concepts. (author)

  2. Present and Future of Semiconductor Pulsed Power Generator ˜Role of Power Semiconductor Devices in Plasma Research˜ 4.Fast High-Voltage Pulse Generator Utilizing SI-Thyristor

    Science.gov (United States)

    Ibuka, Shinji

    Research on and development of a fast high-voltage pulse generator utilizing a SI-thyristor is reviewed. Although the SI-thyristor is a device developed for large current control in the power electronics field, it has desirable properties for pulsed power applications. According to the experimental results on the SI-thyristor, the turn-on characteristics can be drastically improved by driving with a fast and large gate current. The self-turn-off capability of the SI-thyristor was also applied to the inductive energy storage circuit. This paper introduces a newly developed turn-off scheme with the SI-thyristor assisted by MOSFETs to make the circuit configuration extremely robust and simple. A high-voltage pulse with the amplitude of 18.7kV and the pulse width of 74 ns was successfully obtained at the primary voltage of 100 V.

  3. Powerful electrostatic FEL: Regime of operation, recovery of the spent electron beam and high voltage generator

    Energy Technology Data Exchange (ETDEWEB)

    Boscolo, I. [Univ. and INFN, Milan (Italy); Gong, J. [Southwest Jiaotong Univ., Chengdu (China)

    1995-02-01

    FEL, driven by a Cockcroft-Walton electrostatic accelerator with the recovery of the spent electron beam, is proposed as powerful radiation source for plasma heating. The low gain and high gain regimes are compared in view of the recovery problem and the high gain regime is shown to be much more favourable. A new design of the onion Cockcroft-Walton is presented.

  4. High voltage, high power operation of the plasma erosion opening switch

    International Nuclear Information System (INIS)

    A Plasma Erosion Opening Switch (PEOS) is used as the opening switch for a vacuum inductive storage system driven by a 1.8-MV, 1.6-TW pulsed power generator. A 135-nH vacuum inductor is current charged to ?750 kA in 50 ns through the closed PEOS which then opens in <10 ns into an inverse ion diode load. Electrical diagnostics and nuclear activations from ions accelerated in the diode yield a peak load voltage (4.25 MV) and peak load power (2.8 TW) that are 2.4 and 1.8 times greater than ideal matched load values for the same generator pulse

  5. Minimization of Power Loss in Distribution Systems by Implementation of High Voltage Distribution System

    OpenAIRE

    PARWAL Arvind; KHAN Md. Arif; Sharma, Arvind; THOMBRE Ashish Digambar

    2013-01-01

    The loads in rustic area are preeminent pump sets used for various applications i.e. lift irrigation system. Minimal power factor and minimal load factor is found in loads. Further, being a factordissemination of loads, load density is found low. The present distribution system dwell of three-phase 11KV/433Volts distribution transformer with extended L.T Lines. In this system, voltage profile and reliability are poor. In this paper, HVDS is unveiled with smallcapacity distribution transformer...

  6. Development of high strength invar alloy wire for high voltage overhead power transmission line

    OpenAIRE

    Nishikawa, T.; Takaki, Y.; Sanai, M.; Kitamura, S.; Nakama, K.; Kariya, T.

    2010-01-01

    In recent years we have seen a worldwide increase in the demand for electric conductors which have a large transmission capacity to meet rapidly growing electricity consumption. The use of ZTACIR (Aluminum Conductor Invar Reinforced) can double the capacity of overhead power transmission line without extra infrastructure construction. In particular, aluminum clad invar alloy wire, which is highly resistant to corrosion, reduces transmission loss, and produces less CO2 emissions, is increasing...

  7. Light weight, high power, high voltage dc/dc converter technologies

    Science.gov (United States)

    Kraus, Robert; Myers, Ira; Baumann, Eric

    1990-01-01

    Power-conditioning weight reductions by orders of magnitude will be required to enable the megawatt-power-level space systems envisioned by the Strategic Defense Initiative, the Air Force, and NASA. An interagency program has been initiated to develop an 0.1-kg/kW dc/dc converter technology base for these future space applications. Three contractors are in the first phase of a competitive program to develop a megawatt dc/dc converter. Researchers at NASA Lewis Research Center are investigating innovative converter topology control. Three different converter subsystems based on square wave, resonant, and super-resonant topologies are being designed. The components required for the converter designs cover a wide array of technologies. Two different switches, one semiconductor and the other gas, are under development. Issues related to thermal management and material reliability for inductors, transformers, and capacitors are being investigated in order to maximize power density. A brief description of each of the concepts proposed to meet the goals of this program is presented.

  8. APS power supply controls

    International Nuclear Information System (INIS)

    The purpose of this document is to provide comprehensive coverage of the APS power supply control design. This includes application software, embedded controller software, networks, and hardware. The basic components will be introduced first, followed by the requirements driving the overall design. Subsequent sections will address each component of the design one by one. Latter sections will address specific applications

  9. Lightweight Regulated Power Supply

    Science.gov (United States)

    Mclyman, C. W.

    1985-01-01

    Power-supply circuit regulates output voltage by adjusting frequency of chopper circuit according to variations. Currently installed in battery charger for electric wheelchair, circuit is well suited to other uses in which light weight is important - for example, in portable computers, radios, and test instruments.

  10. Radiatively heated high voltage pyroelectric crystal pulser

    Energy Technology Data Exchange (ETDEWEB)

    Antolak, A.J., E-mail: antolak@sandia.gov [Sandia National Laboratories, Livermore, CA 94550 (United States); Chen, A.X. [Sandia National Laboratories, Livermore, CA 94550 (United States); Leung, K.-N. [Sandia National Laboratories, Livermore, CA 94550 (United States); Nuclear Engineering Department, University of California, Berkeley (United States); Morse, D.H.; Raber, T.N. [Sandia National Laboratories, Livermore, CA 94550 (United States)

    2014-01-21

    Thin lithium tantalate pyroelectric crystals in a multi-stage pulser were heated by quartz lamps during their charging phase to generate high voltage pulses. The charging voltage was determined empirically based on the measured breakdown voltage in air and verified by the induced breakdown voltage of an external high voltage power supply. A four-stage pyroelectric crystal device generated pulse discharges of up to 86 kV using both quartz lamps (radiative) and thermoelectric (conductive) heating. Approximately 50 mJ of electrical energy was harvested from the crystals when radiatively heated in air, and up to 720 mJ was produced when the crystals were submerged in a dielectric fluid. It is anticipated that joule-level pulse discharges could be obtained by employing additional stages and optimizing the heating configuration.

  11. Radiatively heated high voltage pyroelectric crystal pulser

    International Nuclear Information System (INIS)

    Thin lithium tantalate pyroelectric crystals in a multi-stage pulser were heated by quartz lamps during their charging phase to generate high voltage pulses. The charging voltage was determined empirically based on the measured breakdown voltage in air and verified by the induced breakdown voltage of an external high voltage power supply. A four-stage pyroelectric crystal device generated pulse discharges of up to 86 kV using both quartz lamps (radiative) and thermoelectric (conductive) heating. Approximately 50 mJ of electrical energy was harvested from the crystals when radiatively heated in air, and up to 720 mJ was produced when the crystals were submerged in a dielectric fluid. It is anticipated that joule-level pulse discharges could be obtained by employing additional stages and optimizing the heating configuration

  12. Solid State Remote Power Controllers for high voltage DC distribution systems

    Science.gov (United States)

    Billings, W. W.; Sundberg, G. R.

    1977-01-01

    Presently, hybrid Remote Power Controllers (RPC's) are in production and prototype units are available for systems utilizing 28VDC, 120VDC, 115VAC/400 Hz and 230VAC/400 Hz. This paper describes RPC development in a new area of application: HVDC distribution systems utilizing 270/300VDC. Two RPC current ratings, 1 amp and 2 amps, were selected for development as they are adequate to control 90% of projected system loads. The various aspects and trade-offs encountered in circuit development are discussed with special focus placed on the circuits that see the duress of the high dc potentials. The comprehensive evaluation tests are summarized which confirmed the RPC compliance with the specification and with system/load compatibility requirements. In addition, present technology status and new applications are summarized.

  13. Discontinuous Mode Power Supply

    Science.gov (United States)

    Lagadinos, John; Poulos, Ethel

    2012-01-01

    A document discusses the changes made to a standard push-pull inverter circuit to avoid saturation effects in the main inverter power supply. Typically, in a standard push-pull arrangement, the unsymmetrical primary excitation causes variations in the volt second integral of each half of the excitation cycle that could lead to the establishment of DC flux density in the magnetic core, which could eventually cause saturation of the main inverter transformer. The relocation of the filter reactor normally placed across the output of the power supply solves this problem. The filter reactor was placed in series with the primary circuit of the main inverter transformer, and is presented as impedance against the sudden changes on the input current. The reactor averaged the input current in the primary circuit, avoiding saturation of the main inverter transformer. Since the implementation of the described change, the above problem has not reoccurred, and failures in the main power transistors have been avoided.

  14. Advanced Accessory Power Supply Topologies

    Energy Technology Data Exchange (ETDEWEB)

    Marlino, L.D.

    2010-06-15

    This Cooperative Research and Development Agreement (CRADA) began December 8, 2000 and ended September 30, 2009. The total funding provided by the Participant (General Motors Advanced Technology Vehicles [GM]) during the course of the CRADA totaled $1.2M enabling the Contractor (UT-Battelle, LLC [Oak Ridge National Laboratory, a.k.a. ORNL]) to contribute significantly to the joint project. The initial task was to work with GM on the feasibility of developing their conceptual approach of modifying major components of the existing traction inverter/drive to develop low cost, robust, accessory power. Two alternate methods for implementation were suggested by ORNL and both were proven successful through simulations and then extensive testing of prototypes designed and fabricated during the project. This validated the GM overall concept. Moreover, three joint U.S. patents were issued and subsequently licensed by GM. After successfully fulfilling the initial objective, the direction and duration of the CRADA was modified and GM provided funding for two additional tasks. The first new task was to provide the basic development for implementing a cascaded inverter technology into hybrid vehicles (including plug-in hybrid, fuel cell, and electric). The second new task was to continue the basic development for implementing inverter and converter topologies and new technology assessments for hybrid vehicle applications. Additionally, this task was to address the use of high temperature components in drive systems. Under this CRADA, ORNL conducted further research based on GM’s idea of using the motor magnetic core and windings to produce bidirectional accessory power supply that is nongalvanically coupled to the terminals of the high voltage dc-link battery of hybrid vehicles. In order not to interfere with the motor’s torque, ORNL suggested to use the zero-sequence, highfrequency harmonics carried by the main fundamental motor current for producing the accessory power. Two studies were conducted at ORNL. One was to put an additional winding in the motor slots to magnetically link with the high frequency of the controllable zero-sequence stator currents that do not produce any zero-sequence harmonic torques. The second approach was to utilize the corners of the square stator punching for the high-frequency transformers of the dc/dc inverter. Both approaches were successful. This CRADA validated the feasibility of GM’s desire to use the motor’s magnetic core and windings to produce bidirectional accessory power supply. Three joint U.S. patents with GM were issued to ORNL and GM by the U.S. Patent Office for the research results produced by this CRADA.

  15. The effect of high voltage power lines on radon concentrations in air using solid state nuclear track detector CR-39 in Baghdad city

    International Nuclear Information System (INIS)

    This work involves the study of the effect of high Voltage power lines 400kV on radon concentration and its decay products using products using nuclear track detectors CR-39 in Baghdad city for one month inside and outside Bob Al-Sham station 400kV as well as in a number of the houses which are very close to the high voltage power during autumn. The concentrations of radon were determined through the comparison with the standard samples, and through the concluded results, we find that the value of weighted average of radon concentration inside the building which are under the effect of high voltage 400kV was (91.77 ± 0.12Bq/m3), As for the buildings which are far from the high voltage lines at distance 600m, it was equal to (23.27±0.773Bq/m3) and outside the buildings (13.63±0.99 Bq/m3). The results of the study show the increase of radon concentration in the ares which are close to high voltage power lines clear effect of high voltage power lines upon the concentration of radon, and this influence increases with increase of the force of electromagnetic field as well as the near distance with these lines. The increase of concentration was due to the fact that the walls of the buildings are considered to be the main source for generating radon inside the building as well as the building history and their height upon the level of earth surface. (Author)

  16. FEM Simulation of the temperature distribution and power density at platinum cathode craters caused by high voltage ignition discharges

    International Nuclear Information System (INIS)

    Craters caused by high voltage ignition discharges on the surface of materials are important features of the erosion processes of electrodes. In this paper, a thermal simulation of the crater formation on a platinum cathode is carried out by means of the finite element method (FEM). The model is based on the modelling of cathode spots and includes phenomena such as ion bombardment, electron emission, vaporization, melting and heat conduction. The surface of the cathode is submitted to various ion power densities (1010-1012 W m-2) of different durations (0.1, 1 and 10 ?s) over a disc of a radius a = 10 ?m. By comparing the results of the simulation with experimental data of molten depths and molten volumes, characteristic values of the time, the ion power density and the current involved in the crater formation are determined. These values are related to the electrical characteristic of an ignition discharge, permitting the identification of the phase producing the crater. Furthermore, the contribution of the different heat dissipation mechanisms is evaluated and discussed.

  17. Characterization of combined power plasma jet using AC high voltage and nanosecond pulse for reactive species composition control

    Science.gov (United States)

    Takashima, Keisuke; Konishi, Hideaki; Kato, Toshiaki; Kaneko, Toshiro

    2014-10-01

    In the application studies for both bio-medical and agricultural applications, the roles of the reactive oxide and/or nitride species generated in the plasma has been reported as a key to control the effects and ill-effects on the living organism. The correlation between total OH radical exposure from an air atmospheric pressure plasma jet and the sterilization threshold on Botrytis cinerea is presented. With the increase of the OH radical exposure to the Botrytis cinerea, the probability of sterilization is increased. In this study, to resolve the roles of reactive species including OH radicals, a combined power plasma jet using nanosecond pulses and low-frequency sinusoidal AC high voltage (a few kHz) is studied for controlling the composition of the reactive species. The nanosecond pulses are superimposed on the AC voltage which is in synchronization with the AC phase. The undergoing work to characterize the combined power discharge with electric charge and voltage cycle on the plasma jet will also be presented to discuss the discharge characteristics to control the composition of the reactive species.

  18. High-power test of a prototype of power supplies for UHF klystrons

    International Nuclear Information System (INIS)

    Modurating-anode type UHF klystrons will be used as rf power sources for an RFQ linac and drift-tube-linacs (DTL) in the JHP. We designed and constructed a prototype of the power supplies which provide high-voltage pulse power to the klystrons. A high-power test of the prototype was carried out using a UHF klystron (THOMSON TH2134) as a load. In this report, the test results are described. (author)

  19. Arc lamp power supply using a voltage multiplier

    Science.gov (United States)

    Leighty, Bradley D.

    1988-01-01

    A power supply is provided for an arc discharge lamp which includes a relatively low voltage high current power supply section and a high voltage starter circuit. The low voltage section includes a transformer, rectifier, variable resistor and a bank of capacitors, while the starter circuit comprises several diodes and capacitors connected as a Cockcroft-Walton multiplier. The starting circuit is effectively bypassed when the lamp arc is established and serves to automatically provide a high starting voltage to re-strike the lamp arc if the arc is extinguished by a power interruption.

  20. Pneumatic Power Supply

    Science.gov (United States)

    Bartelt, Terry L. M.

    This brief interactive activity, by Electromechanical Digital Library and Wisconsin Technical College System faculty member Terry Bartelt, begins with a discussion of the three basic components of a pneumatic power system, the prime mover, compressor, and receiver tank. Visitors can learn about each one, its purpose in the system, and how it works through illustrations and animations. The next section discusses and demonstrates power supply operation, with all three parts working to complete the system. This is an excellent resource for electromechanical and pneumatics classes.

  1. High voltage InAlN/GaN HEMTs with nonalloyed Source/Drain for RF power applications

    Science.gov (United States)

    Zhou, Qi; Yang, Shu; Chen, Wanjun; Zhang, Bo; Feng, Zhihong; Cai, Shujun; Chen, Kevin J.

    2014-01-01

    In this work, we propose the nonalloyed Schottky Source/Drain (SSD) technology for high voltage InAlN/GaN HEMTs. The proposed device features excellent metal morphology both in lateral and vertical benefiting from the removal of metallic overflow associated with the conventional alloyed Ohmic contacts, which bodes well for device scaling and high breakdown voltage (BV) obtained in the proposed device. The nonalloyed Source/Drain (S/D) also paves the way for the SSD HEMTs using a gate-first fabrication process with the standard Ni/Au gate stack. Despite the Schottky Source/Drain, an SSD HEMT with LG = 1.25 ?m exhibits a decent maximum drain current of 575 mA/mm and peak transconductance of 216 mS/mm. The corresponding BV is 58 V which is the highest BV reported on GaN HEMTs for a short LGD of 250 nm. Without using any field-plate structure, the BV of 605 V is achieved in an SSD HEMT with LGD = 15 ?m, realizing 229% improvement compared with the conventional InAlN/GaN HEMTs. The proposed SSD technology featuring scaling capability and high breakdown voltage is suitable for RF power applications and can be further developed for self-aligned InAlN/GaN HEMTs.

  2. Best use of high-voltage, high-powered electron beams: a new approach to contract irradiation services

    International Nuclear Information System (INIS)

    Japan's first high-voltage, high-powered electron beam processing center is scheduled to come on-line during the first half of 1999. The center explores both challenges and opportunities of how best to use the 200 kW 10 MeV unit and its 5 MeV X-ray line. In particular, Nuclear Fuel Industries, Ltd. (NFI) has expanded the traditional model of a contract irradiation facility to include a much broader scope of services such as door-to-door transport, storage, and direct distribution to its customer's end-users. The new business scope not only finds new value-added components in a competitive marketplace, but serves to provide a viable mechanism to take advantage of the processing logistics of high throughput irradiation units. As such, the center features a high-capacity warehousing system, monitored by a newly developed PCMS (plant control management system), which has been comprehensively integrated into the irradiation unit's handling system, and will require only minimal human resources for its high rate of material handling. The identification and development of initial markets for this first unit will be discussed, concluding with how this same operational philosophy can help break open new irradiation segments in medical devices, consumer goods, animal feed, and food markets and NFI's other efforts in these same areas. (author)

  3. Best use of high-voltage, high-powered electron beams: a new approach to contract irradiation services

    Science.gov (United States)

    Watanabe, T.

    2000-03-01

    Japan's first high-voltage, high-powered electron beam processing center is scheduled to come on-line during the first half of 1999. The center explores both challenges and opportunities of how best to use the 200 kW 10 MeV unit and its 5 MeV X-ray line. In particular, Nuclear Fuel Industries, Ltd. (NFI) has expanded the traditional model of a contract irradiation facility to include a much broader scope of services such as door-to-door transport, storage, and direct distribution to its customer's end-users. The new business scope not only finds new value-added components in a competitive marketplace, but serves to provide a viable mechanism to take advantage of the processing logistics of high throughput irradiation units. As such, the center features a high-capacity warehousing system, monitored by a newly developed PCMS (plant control management system), which has been comprehensively integrated into the irradiation unit's handling system, and will require only minimal human resources for its high rate of material handling. The identification and development of initial markets for this first unit will be discussed, concluding with how this same operational philosophy can help break open new irradiation segments in medical devices, consumer goods, animal feed, and food markets and NFI's other efforts in these same areas.

  4. Electromagnetic field model for the numerical computation of voltages induced on buried pipelines by high voltage overhead power lines

    Science.gov (United States)

    Munteanu, C.; Mates, G.; Purcar, M.; Topa, V.; Pop, I. T.; Grindei, L.; Racasan, A.

    2012-07-01

    This paper proposes an innovative, generally applicable numerical model for the calculation of the three-dimensional (3D) electromagnetic field generated by high voltage (HV) overhead power transmission lines (OHL) on the buried metallic structures (e.g., pipeline networks). The numerical analysis is based on a coupled finite element-boundary element model (FEM-BEM) designed to calculate the induced potential on buried pipelines for complex geometrical structures of HV OHL networks working on normal or fault conditions. The one-dimensional (1D) FEM technique based on pipe elements is used to discretize the mathematical model that describes the interior of the pipe and is coupled with the mathematical model that describes the exterior of the pipe using 3D-BEM integral equations. The full electromagnetic field model gives the flexibility to calculate the potential distribution in any point of the soil, providing useful information for the step and touching voltages. The computation accuracy of the numerical algorithm implemented is verified through two test problems by comparing the numerical results with those obtained using a software package based on the Transmission Line Method (TLM) and CIGRE formulae. Last part of the paper presents calculations of the induced potential on buried pipeline in the vicinity of a complex HV OHL working on normal and fault condition. The influence of the currents' direction and magnitude flowing on the HV OHL on the induced pipeline potential distribution is analyzed.

  5. Verification of the windings axial clamping forces for high voltage power transformers by using passively mode-locked fiber lasers

    Science.gov (United States)

    ?chiopu, Ionuţ Romeo; ?gulinescu, Andrei, Dr; Iord?nescu, Raluca; Marinescu, Andrei

    2015-02-01

    The current paper describes an optoelectronic method for direct monitoring of the axial clamping forces both in static and in dynamic duty. As advantages of this method we can state that it can be applied both to new and refurbished transformers without performing constructive changes or affecting in any way the transformer safety in operation. For monitoring the axial clamping forces for high-voltage (HV) power transformers, we use an optical fiber that we integrate into the laser cavity of a passively mode-locked fiber laser (PMFL). To each axial clamp corresponds a solitonic optical spectrum that is changed at the periodical passing of the fundamental soliton pulse through the sensitive fiber inside the transformer. Moreover, as a specific characteristic, the laser stability is unique for each set of axial clamping forces. Other important advantages of using an optical fiber as compared to the classical approach in which electronic sensors are used consist in the good reliability and insulator properties of the optical fiber, avoiding any risk of fire or damage of the transformer.

  6. RHIC Power Supply Ramp Diagnostics*

    OpenAIRE

    Morris, J. T.; Clifford, T. S.; Frak, B.; Laster, J.; Marusic, A.; Zeijts, J.

    2001-01-01

    Reliable and reproducible performance of the more than 800 Relativistic Heavy Ion Collider (RHIC) magnet power supplies is essential to successful RHIC operation. In order to support power supply commissioning, a system was developed to capture detailed power supply measurements from all the RHIC ring power supplies during acceleration ramps. Diagnostic tools were developed to allow experts to assess ramp reproducibility and rapidly identify problems. The system has now beco...

  7. High voltage designing of 300.000 Volt

    International Nuclear Information System (INIS)

    Some methods of designing a.c and d.c high voltage supplies are discussed. A high voltage supply for the Gama Research Centre accelerator is designed using transistor pulse generators. High voltage transformers being made using radio transistor ferrits as a core are also discussed. (author)

  8. Nanosecond pulsed electric fields (nsPEFs) low cost generator design using power MOSFET and Cockcroft-Walton multiplier circuit as high voltage DC source

    Science.gov (United States)

    Sulaeman, M. Y.; Widita, R.

    2014-09-01

    Purpose: Non-ionizing radiation therapy for cancer using pulsed electric field with high intensity field has become an interesting field new research topic. A new method using nanosecond pulsed electric fields (nsPEFs) offers a novel means to treat cancer. Not like the conventional electroporation, nsPEFs able to create nanopores in all membranes of the cell, including membrane in cell organelles, like mitochondria and nucleus. NsPEFs will promote cell death in several cell types, including cancer cell by apoptosis mechanism. NsPEFs will use pulse with intensity of electric field higher than conventional electroporation, between 20-100 kV/cm and with shorter duration of pulse than conventional electroporation. NsPEFs requires a generator to produce high voltage pulse and to achieve high intensity electric field with proper pulse width. However, manufacturing cost for creating generator that generates a high voltage with short duration for nsPEFs purposes is highly expensive. Hence, the aim of this research is to obtain the low cost generator design that is able to produce a high voltage pulse with nanosecond width and will be used for nsPEFs purposes. Method: Cockcroft-Walton multiplier circuit will boost the input of 220 volt AC into high voltage DC around 1500 volt and it will be combined by a series of power MOSFET as a fast switch to obtain a high voltage with nanosecond pulse width. The motivation using Cockcroft-Walton multiplier is to acquire a low-cost high voltage DC generator; it will use capacitors and diodes arranged like a step. Power MOSFET connected in series is used as voltage divider to share the high voltage in order not to damage them. Results: This design is expected to acquire a low-cost generator that can achieve the high voltage pulse in amount of -1.5 kV with falltime 3 ns and risetime 15 ns into a 50? load that will be used for nsPEFs purposes. Further detailed on the circuit design will be explained at presentation.

  9. Nanosecond pulsed electric fields (nsPEFs) low cost generator design using power MOSFET and Cockcroft-Walton multiplier circuit as high voltage DC source

    International Nuclear Information System (INIS)

    Purpose: Non-ionizing radiation therapy for cancer using pulsed electric field with high intensity field has become an interesting field new research topic. A new method using nanosecond pulsed electric fields (nsPEFs) offers a novel means to treat cancer. Not like the conventional electroporation, nsPEFs able to create nanopores in all membranes of the cell, including membrane in cell organelles, like mitochondria and nucleus. NsPEFs will promote cell death in several cell types, including cancer cell by apoptosis mechanism. NsPEFs will use pulse with intensity of electric field higher than conventional electroporation, between 20–100 kV/cm and with shorter duration of pulse than conventional electroporation. NsPEFs requires a generator to produce high voltage pulse and to achieve high intensity electric field with proper pulse width. However, manufacturing cost for creating generator that generates a high voltage with short duration for nsPEFs purposes is highly expensive. Hence, the aim of this research is to obtain the low cost generator design that is able to produce a high voltage pulse with nanosecond width and will be used for nsPEFs purposes. Method: Cockcroft-Walton multiplier circuit will boost the input of 220 volt AC into high voltage DC around 1500 volt and it will be combined by a series of power MOSFET as a fast switch to obtain a high voltage with nanosecond pulse width. The motivation using Cockcroft-Walton multiplier is to acquire a low-cost high voltage DC generator; it will use capacitors and diodes arranged like a step. Power MOSFET connected in series is used as voltage divider to share the high voltage in order not to damage them. Results: This design is expected to acquire a low-cost generator that can achieve the high voltage pulse in amount of ?1.5 kV with falltime 3 ns and risetime 15 ns into a 50? load that will be used for nsPEFs purposes. Further detailed on the circuit design will be explained at presentation

  10. Nanosecond pulsed electric fields (nsPEFs) low cost generator design using power MOSFET and Cockcroft-Walton multiplier circuit as high voltage DC source

    Energy Technology Data Exchange (ETDEWEB)

    Sulaeman, M. Y.; Widita, R. [Department of Physics, Nuclear Physics and Biophysics Research Division, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung, Bandung (Indonesia)

    2014-09-30

    Purpose: Non-ionizing radiation therapy for cancer using pulsed electric field with high intensity field has become an interesting field new research topic. A new method using nanosecond pulsed electric fields (nsPEFs) offers a novel means to treat cancer. Not like the conventional electroporation, nsPEFs able to create nanopores in all membranes of the cell, including membrane in cell organelles, like mitochondria and nucleus. NsPEFs will promote cell death in several cell types, including cancer cell by apoptosis mechanism. NsPEFs will use pulse with intensity of electric field higher than conventional electroporation, between 20–100 kV/cm and with shorter duration of pulse than conventional electroporation. NsPEFs requires a generator to produce high voltage pulse and to achieve high intensity electric field with proper pulse width. However, manufacturing cost for creating generator that generates a high voltage with short duration for nsPEFs purposes is highly expensive. Hence, the aim of this research is to obtain the low cost generator design that is able to produce a high voltage pulse with nanosecond width and will be used for nsPEFs purposes. Method: Cockcroft-Walton multiplier circuit will boost the input of 220 volt AC into high voltage DC around 1500 volt and it will be combined by a series of power MOSFET as a fast switch to obtain a high voltage with nanosecond pulse width. The motivation using Cockcroft-Walton multiplier is to acquire a low-cost high voltage DC generator; it will use capacitors and diodes arranged like a step. Power MOSFET connected in series is used as voltage divider to share the high voltage in order not to damage them. Results: This design is expected to acquire a low-cost generator that can achieve the high voltage pulse in amount of ?1.5 kV with falltime 3 ns and risetime 15 ns into a 50? load that will be used for nsPEFs purposes. Further detailed on the circuit design will be explained at presentation.

  11. Bipolar Pulsed-DC Power Supply for Magnetron Sputtering and Thin Films Synthesis

    OpenAIRE

    Vittaya Amornkitbamrung; Tosawat Seetawan; Ian Thomas; Weerasak Somkhunthot; Thanusit Burinprakhon

    2007-01-01

    A pulsed-dc power supply has been designed and constructed for use in a magnetron sputtering system and forthin film synthesis. The power supply consists of three major parts: (1) two high voltage direct current (dc) power suppliesutilizing a phase control circuit for power delivery, (2) pulse generator and two power switching circuits, and (3) feedbackcircuits for current and voltage controls, displays, and safety measures. For a high level of safety operation, opticalconnections were employ...

  12. Resonance power supplies for large accelerator

    International Nuclear Information System (INIS)

    The resonance power supply has been proposed as an efficient power supply for a future 6 GB, keon producing accelerator. This report presents a detailed analysis of the circuit operation. Based on these analyses each component is designed, one line diagram is developed, component requirements are determined and a detailed cost estimate is prepared. The major components of the system are: the magnet power supply, high voltage by-pass thyristor switch, with l0kA repetitive interruption capability, capacitor banks, capacitor bank thyristor switch, and an energy make up device. The most important components are the bypass thyristor switch and the energy injection device. The bypass thyristor switch is designed to turn on and interrupt to 10 kA dc current with a recovery voltage of 20kV and repetition frequency of 3 Hz. The switch consists of a large array of series and parallel connected thyristors and gate turn off (GTO) devices. The make up energy device is designed to replace the circuit energy losses. A capacitor bank is charged with constant current and discharged during the acceleration period. One of the advantages of the developed circuit is that it can be supplied directly from the local power network. In order to prove the validity of the assumptions, a scaled down model circuit was thoroughly tested. These tests proved that the engineering design of critical components is correct and this resonant power supply can be properly controlled by an inventer/rectifier connected in series with the magnet and by the make up energy device. This finding reduces the system cost

  13. Power-Supply-Conditioning Circuit

    Science.gov (United States)

    Primas, L. E.; Loveland, R. C.

    1989-01-01

    Fluctuations of voltage suppressed in power supplies for precise radio-frequency circuits. Circuit suppresses both periodic and random deviations of dc supply voltage from desired steady level. Highly-stable feedback voltage regulator, conditioner intended in conjunction with conventional power-supply circuit to provide constant voltage to atomic frequency standard or other precise oscillator. Without conditioners, outputs of most commercial power supplies contain fluctuations causing unacceptably-large phase and amplitude modulation of precise oscillators.

  14. Power Supply Unit

    Science.gov (United States)

    1982-01-01

    The Cuk DC to DC Switching Converter was developed by Caltech Professors, Slobodan Cuk and R. D. Middlebrook. The converter changes unsuitable dc voltage into one or more voltages suitable for powering electronic equipment; it can also be used in converting dc current to ac and vice versa. It was named one of the 100 most significant technical advances of 1979. The Cuk converter is more efficient than previous conversion devices, simpler, smaller, lighter, cheaper and highly reliable. The first application of the technology is in the Compucorp 685 word/data processor, manufactured by Compucorp. NASA waived title rights; Caltech granted exclusive license to the inventors, who in turn, transferred their rights to a company they founded called TESLA Company, which sublicenses the converter design and related technology to companies making power supplies for use in their own products.

  15. High-voltage engineering and testing

    CERN Document Server

    Ryan, Hugh M

    2013-01-01

    This 3rd edition of High Voltage Engineering Testing describes strategic developments in the field and reflects on how they can best be managed. All the key components of high voltage and distribution systems are covered including electric power networks, UHV and HV. Distribution systems including HVDC and power electronic systems are also considered.

  16. Preparation and exploitation of powerful klystron amplifiers for linac RF power supply

    International Nuclear Information System (INIS)

    The paper presents data about restoration, preparation and operation of high voltage klystrons type of 'Aurora' that are used as main source of high frequency power supply of linear electron accelerators in NSC KIPT. In consideration of the experience in operation of huge amount of industrial klystrons and development of new methods to parameters control, processes of degassing devices, cathode activation, high voltage and high frequency klystron train to achieve output performance objectives and maximal life time are optimized and features are estimated. The results of prototype operation are analyzed.

  17. System of pulse power supply with accumulator for energy storage

    International Nuclear Information System (INIS)

    Principles for designing a pulse power supply system of a powerful high-voltage generator used for additional plasma heating in a tokamak reactor by means Of Alfven waves are described. The power supply system with an accumulator for energy storage is consideped. Advisability for the transformation of the accumulator voltage to higher valua is shown. In this case direct accumulator direct current voltage is transformed to alternating one with further transformation and rectification. A scheme of the developed parallel thyristor inverter is described and the results of its investigation are presented. The principle for designing the power supply system is the modular one Each module has 24 6ST-140R accumulators with total voltage o 250-300 V, supplying after transformation (atthe module output) the voltage of 1000 V

  18. Design and development of power supplies for high power IOT based RF amplifier

    International Nuclear Information System (INIS)

    Design, development, circuit topology, function of system components and key system specifications of different power supplies for biasing electrodes of Thales Inductive Output Tube (IOT) based high power RF amplifier are presented in this paper. A high voltage power supply (-30 kV, 3.2A dc) with fast (?microsecond) crowbar protection circuit is designed, developed and commissioned at VECC for testing the complete setup. Other power supplies for biasing grid electrode (300V, 0.5A dc) and Ion Pump (3 kV, 0.1mA dc) of IOT are also designed, developed and tested with actual load. A HV Deck (60kV Isolation) is specially designed in house to place these power supplies which are floating at 30 kV. All these power supplies are powered by an Isolation Transformer (5 kVA, 60 kV isolation) designed and developed in VECC. (author)

  19. Advances in the development of the nested high voltage generator

    International Nuclear Information System (INIS)

    The Nested High Voltage Generator (NHVG) is a high voltage accelerator/power supply topology which can potentially satisfy a variety of requirements for a compact, reliable inexpensive DC accelerator in the 0.25 - 10 MeV range. Applications for this technology include the generation of high voltage, high current pulsed electron beams for the curing of polymers, and the sterilization of medical waste. This technology has recently been demonstrated in an accelerator which has operated at 500 kV with an electron beam in a 36 inch long, 17 inch diameter device. In this paper the authors briefly describe the technology, and the operation of 3 machines built since the initial discussion of the technology in the 1991 Particle Accelerator Conference Proceedings. The operation of a machine at up to 500 kV and 83% efficiency has been demonstrated, and is particularly noteworthy

  20. Energy discharge heater power supply

    International Nuclear Information System (INIS)

    The heater power supply is intended to supply capacitively stored,energy to embedded heater strips in cryo magnets. The amount of energy can be controlled by setting different charge different capacitor values. Two chassis' can be operated in series or interlocks are provided. The charge voltage, number of capacitors pulse can be monitored. There and dual channel has two discharge supplies in one chassis. This report reviews the characteristics of this power supply further

  1. Operation of the magnet power supplies. Reliability and improvements

    International Nuclear Information System (INIS)

    The JET Magnet Power Supply Scheme includes a combination of flywheel generator-diode rectifiers and mains driven transformer-thyristor rectifiers for the supply of energy to the coils and a switching network with air blast circuit breakers and commutating resistors for inducing the high voltage required for the plasma initiation. They have now been in operation for three years. During this period, a set of information on the reliability of various power supply equipments under pulsed operation has been obtained. For each equipment is given a list of faults, indicating potential weaknesses, as well as the remedies and the improvements that have been applied. The Magnet Power Supplies have at present, on average, 6-8 different faults per week with approximately three of them leading to loss of operating time. (author)

  2. Supply Power Factor Improvement in Ozone Generator System Using Active Power Factor Correction Converter

    Directory of Open Access Journals (Sweden)

    G. Udhayakumar

    2015-06-01

    Full Text Available Artificial Ozone Generating system needs High Voltage, High Frequency supply. The Ozonator distorts the supply currents and henceforth affect the supply power factor. This paper presents the performance comparison of PWM inverter to Power Factor Corrected (PFC converter with PWM inverter based High-voltage High-frequency power supply for ozone generator system. The conventional inverter has front end bridge rectifier with smoothing capacitor. It draws non-sinusoidal current from ac mains; as a result input supply has more harmonics and poor power factor. Hence, there is a continuous need for power factor improvement and reduction of line current harmonics.  The proposed system has active power factor correction converter which is used to achieve sinusoidal current and improve the supply power factor. The active PFC converter with PWM inverter fed ozone generator generates more ozone output compared to the conventional inverter. Thus the proposed system has less current harmonics and better input power factor compared to the conventional system.  The performance of the both inverters are compared and analyzed with the help of simulation results presented in this paper.

  3. SCR switched capacitor voltage regulator for 150 kV neutral beam power supply

    International Nuclear Information System (INIS)

    This paper describes the LBL, MFE Neutral Beam Test Stand III B high voltage regulator system. The regulator is 100% solid state and provides 1% regulation at power levels in excess of 10 MW for 50 msec. Regulation is achieved by switching charged capactors in series with a large main capacitor bank which supplies the bulk of the power

  4. Progress in development of high power pulsed microwave systems, high voltage modulators and associated technologies for particle accelerators

    International Nuclear Information System (INIS)

    The characteristics and quality of the beam delivered by a particle accelerator largely depends on the characteristics of the high power pulsed RF/Microwave fed to the accelerating cavities for creating the accelerating gradient. Various considerations on the rise time/fall time, flat top, ripple on pulse top, stored energy, as well as reliability and safety are the key factors in designing these high power systems. Faults or failures in the RF/microwave system or any of its constituent components can severely affect the operation of the accelerator and need careful system design for eliminating or minimising accelerator turn down time. At RRCAT high power microwave systems for several electron accelerators like 20 MeV Microtron injector for Booster Synchrotron for Indus 1 and Indus 2, 8 MeV Variable energy microtron, 10 MeV electron LINAC were designed, developed and commissioned. Test facilities were developed and supplied to microwave tube R and D lab, CEERI, Pilani, for ageing and evaluation of microwave tubes developed under collaborative efforts. RRCAT has also taken up development of key technologies for advanced accelerators. A 1.3 MW pulsed test stand at 352.2 MHz was successfully designed and developed to qualify devices, subsystems and components developed in-house for Indian as well as International collaboration projects. Development of RF systems at 1.3 GHz as well as test set ups are in progress for SCRF technology development. A solid state bouncer modulator operating at 100 kV, 20 A was successfully designed, developed and supplied to CERN under Novel Accelerator Technology, (NAT) collaboration in LINAC 4 project. Further efforts on other advanced modulator design and construction are also underway. Design and development of 45 MW peak power S Band test facility as well as energy doubler scheme is underway. The present paper describes the recent progress, performance review of high power pulsed RF/Microwave systems, test facilities and components. (author)

  5. Tetrode bias power supply for Indus-1, synchrotron radiation source

    International Nuclear Information System (INIS)

    An AC regulator based 7 kV, 3 A high voltage DC power supply is designed, fabricated and tested on dummy load for BEL make Tetrode type 15000CX, used in the high power RF amplifier at 31.613 MHz employed with INDUS-1, Synchrotron Radiation Source (SRS). Various protections features like over voltage, under voltage, over current, phase failure and phase reversal are incorporated in this power supply and presented in this paper. As Tetrode amplifier requires various other power supplies in addition to this bias power supply and they are operated in a particular sequence for its healthy operation, suitable interlock arrangements have been incorporated and also presented in this paper. The reliable operation of protection and interlock features incorporated in this power supply has been checked with dummy load under simulated conditions. Three numbers of series limiting inductors, one in each phase, have been incorporated in this power supply to limit fault currents under unfavourable conditions and there by increasing the overall life of this power supply. It will replace existing 7 kV, 3 A HVDC power supply, which is in operation for more than fifteen years with Indus-1 SRS and is likely to be helpful in reducing the down time of Indus-1 SRS. It has better performance features than the existing power supply. The long term voltage stability better than 0.3 % and output ripple less than 0.3 % have been achieved for this Tetrode bias power supply. This power supply is likely to be integrated with INDUS-1 SRS soon. (author)

  6. Electrical Structure of Future Off-shore Wind Power Plant with a High Voltage Direct Current Power Transmission

    DEFF Research Database (Denmark)

    Sharma, Ranjan

    2012-01-01

    The increasing demand of electric power and the growing consciousness towards the changing climate has led to a rapid development of renewable energy in the recent years. Among all, wind energy has been the fastest growing energy source in the last decade. But the growing size of wind power plants, better wind conditions at off-shore and the general demand to put them out of sight have all contributed to the installation of large wind power plants in off-shore condition. However, moving wind power plants far out in the off-shore comes with many associated problems. One of the main challenges is the transmission of power over long distance. Historically, the power transmission from off-shore wind power plants has been done via HVAC submarine cables. This provides a simple solution, but AC cables cannot be arbitrarily long. It is shown in the report that major issues with HVAC cable transmission system are related to surplus reactive power and added losses. On the other hand, HVDC transmission system can be arbitrarily long and for long distance power transmission requirement it provides much better efficiency compared to a corresponding HVAC system. HVDC may provide a viable solution for high power transmission over long distances, but some issues related to fulfilling different grid code requirements still need further clarification. A transmission system should foremost provide a stable power transmission and participate in network stabilizing by providing efficient support for AC voltage control and frequency response requirements. These objectives are discussed and verification with simulation results is included in the report. A concept of negative sequence voltage compensation during small voltage unbalances and asymmetrical faults at the grid are also discussed. Secondly, a large WPP is not allowed to trip off during temporary grid side faults, commonly described as low voltage fault-ride-through requirement. There are four different fault-ride-through options discussed in the report. The first option includes controlling of collector network frequency. This provides a very good opportunity to use simple fixed speed wind turbines in the wind power plant. Induction generators attached to a large rotating mass show good response to frequency rise by allowing the rotor to speed up while reducing the active power output. However, it is observed that the post fault recovery process is very difficult to control and as such a high current capacity of the WPP side VSC might be required. Detailed simulation results are included in the report. The other option is to use a DC chopper, the results of which are also presented in detail in the report. It is observed that a DC chopper can provide a simple solution but the efforts required to remove the total heat during power dissipation is enormous. Alternatively, a telecommunication signal may be used, but the reliability and speed of such a system is in doubt. Finally, a controlled AC voltage drop at the collector network is derived and discussed in detail. It is illustrated in the report that such an option is advantageous in the sense that a fault at the grid side and at the wind power plant side can be dealt in the same way. More importantly, a similar wind turbine type can be used regardless of HVAC or HVDC connection strategy. A good co-ordination between the full-scale wind turbine and wind power plant side voltage sourced converter is also verified in the laboratory model based on real time digital simulation of wind turbine connected to an external voltage source converter via a power amplifier . The overall results show that the power transmission from long distance off-shore wind power plant is viable via HVDC system and at the same time the strict gird code requirements can also be fulfilled by selecting proper control methods.

  7. Instrumentation architecture for ITER diagnostic neutral beam power supply system

    International Nuclear Information System (INIS)

    A Neutral Beam (NB) Injection system is used for heating or diagnostics of the plasma in a Tokamak. The Diagnostics Neutral Beam (DNB) system for ITER (International Thermonuclear Experimental Reactor) based on acceleration of negative ions; injects a neutral (H0) beam at 100 KeV with specified modulation into the plasma for charge exchange recombination spectroscopy. DNB Power Supply (DNBPS) system consists of various high voltage power supplies, high current power supplies and RF Generators. The system operates in a given operating sequence; very high electromagnetic transients are intrinsically generated during frequent short circuit at the accelerator grid (breakdowns) and sudden loss of load (Beam off). Instrumentation is to be provided to operate the DNBPS system remotely with required control and protection in synchronisation with ITER operation as directed by CODAC (COntrol Data Access and Communication); the central control system for ITER. Instrumentation functionality includes 1. Operation and control of DNBPS subsystems and associated auxiliaries 2. Protection of DNB components and power supplies using interlock system, 3. To ensure safe operation of high voltage hazardous systems 4. Acquisition of injector performance parameters and 5. To facilitate test and maintenance of individual subsystem. This paper discusses about proposed DNBPS instrumentation architecture. The design generally follows the protocols from the ITER- Plant Control Design Handbook (PCDH). (author)

  8. Practical switching power supply design

    CERN Document Server

    Brown, Martin C

    1990-01-01

    Take the ""black magic"" out of switching power supplies with Practical Switching Power Supply Design! This is a comprehensive ""hands-on"" guide to the theory behind, and design of, PWM and resonant switching supplies. You'll find information on switching supply operation and selecting an appropriate topology for your application. There's extensive coverage of buck, boost, flyback, push-pull, half bridge, and full bridge regulator circuits. Special attention is given to semiconductors used in switching supplies. RFI/EMI reduction, grounding, testing, and safety standards are also deta

  9. Development of microcontroller based remote control system for HV power supply of ECR ion source for ADSS project

    International Nuclear Information System (INIS)

    In this paper we will describe the design and development of the microcontroller based interface card used to control and monitor the operation of High Voltage Power supply 120kV/50mA (HVPS). This power supply is deployed for the extraction of proton beam from the microwave ion source in the ADSS project. (author)

  10. Penumatic-power supply

    Science.gov (United States)

    Kramer, R. C.

    1981-01-01

    Portable compressed air supply has two or more outputs at pressures from 20 to 100 psi. Applications include operating production equipment, spraying paint and lubricants, and pressurizing refrigeration systems. Supply filters air from standard high-pressure line, reduces it to working pressure, and adds lubricant when required. Regulator supplies low-pressure air to output channels. On channel lines, vernier-control valves select output pressures.

  11. Design and implementation of the wireless high voltage control system

    International Nuclear Information System (INIS)

    In this paper we will describe the implementation of the wireless link for controlling and monitoring the serial data between control PC and the interface card (general DAQ card), by replacing existing RS232 based remote control system for controlling and monitoring High Voltage Power Supply (120kV/50mA). The enhancement in the reliability is achieved by replacing old RS232 based control system with wireless system by isolating ground loop. (author)

  12. Investigation of parameters of the three phase high-voltage alternating current plasma generator with power up to 100 kW working on steam

    International Nuclear Information System (INIS)

    The paper presents the results of experimental investigation of parameters of the three-phase high voltage alternating current plasma generator with power up to 100 kW operating on steam with gas protection of the electrodes. Researches were carried out over a range of arc current from 25 to 50 A and range of steam consumption of 3-5 g/s. Current-voltage and volt consumable characteristics, operation oscillograms and dependence of power versus the flow rate of steam and protective gas are presented.

  13. A new klystron / gyrotron power supply and modulator system

    International Nuclear Information System (INIS)

    The Pulse Step Modulator technology is widely used for several high voltage power supply applications, including the supply for gyrotrons, klystrons and neutral beam injectors. Thomson Broadcast and Multimedia is working on a new tube power supply system designed to operate several different klystron and gyrotron tubes for tube production testing. The system consists of the main power supply and the anode / body modulator. The main power supply is rated 160 kV / 20 A cw / 400 A pulse. The anode / body modulator is rated 100 kV / 250 mA. Both subsystems will be realised in PSM technology. The main power supply is a PSM system with some novel features. The target is to achieve very short rise times of 5 ?s with low overshoot and also very low short circuit energies. The anode modulator requires 5 kHz modulation capability on high capacitive loads. This is achieved with a push-pull technology. The anode / body modulator is currently under testing in the Thomson factory. The mains power supply will be installed in the tube factory in autumn 2006. The paper gives an overview on the complete system. It will show the basic features and shows the status of the system testing. (author)

  14. VEC power supplies - operating experience

    International Nuclear Information System (INIS)

    The technology of fabricating precision d.c. magnet supplies has been developed and utilised in the Variable Energy Cyclotron. Stability of 0.01% at current levels upto 2500 A has been achieved. The reliability of the units was confirmed during the operation of the machine. Other power supplies such as the 20 kV, 20 A.d.c., oscillator supply, ion source supply and 120 kV Cockroft-Walton Deflector supply were also developed and their performance tested. Experience gained during operation of these units both under stable and erratic mains voltage conditions is discussed. (auth.)

  15. Design of the HL-2M power supply control system

    International Nuclear Information System (INIS)

    Highlights: • The control system is structured by using four kinds of control networks. • The controlling of converter is based on the real time network and FPGA. • With use of PROFINET, the status of all components can be monitored easily. • The SoE distinguishes input signals clearly to detect the fault rapidly. -- Abstract: The power supply control system is one of the most important local control systems of HL-2M tokamak. The power supply system of HL-2M is composed of four flywheel generator sets with total capacity of 600 MVA, all the magnetic field coil power supplies and high voltage power supplies of auxiliary heating system. The control system of power supply should make sure the large amount of on-site equipment and facilities to operate steadily and reliably. This paper presents the architecture of HL-2M control system and four kinds of established control networks. It describes how the power supply control system is built by using the established hardware structures and software agreements. Specially, it is focused on introducing an application of real-time technology based on the reflective shared memory and the fully digital compact solution for controlling the high power converters. Otherwise, a scheme which adopts PROFINET and Sequence of Events technology to carry out the intellect interlock control system is given

  16. Compact, Lightweight, High Voltage Propellant Isolators Project

    National Aeronautics and Space Administration — TA&T, Inc. proposes an enabling fabrication process for high voltage isolators required in high power solar electric and nuclear electric propulsion (SEP and...

  17. Multiple resonant railgun power supply

    Science.gov (United States)

    Honig, Emanuel M. (Los Alamos, NM); Nunnally, William C. (Los Alamos, NM)

    1988-01-01

    A multiple repetitive resonant railgun power supply provides energy for repetitively propelling projectiles from a pair of parallel rails. A plurality of serially connected paired parallel rails are powered by similar power supplies. Each supply comprises an energy storage capacitor, a storage inductor to form a resonant circuit with the energy storage capacitor and a magnetic switch to transfer energy between the resonant circuit and the pair of parallel rails for the propelling of projectiles. The multiple serial operation permits relatively small energy components to deliver overall relatively large amounts of energy to the projectiles being propelled.

  18. Design of a high voltage input - output ratio dc-dc converter dedicated to small power fuel cell systems

    Science.gov (United States)

    Béthoux, O.; Cathelin, J.

    2010-12-01

    Consuming chemical energy, fuel cells produce simultaneously heat, water and useful electrical power [J.M. Andújar, F. Segura, Renew. Sust. Energy Rev. 13, 2309 (2009)], [J. Larminie, A. Dicks, Fuel Cell Systems Explained, 2nd edn. (John Wiley & Sons, 2003)]. As a matter of fact, the voltage generated by a fuel cell strongly depends on both the load power demand and the operating conditions. Besides, as a result of many design aspects, fuel cells are low voltage and high current electric generators. On the contrary, electric loads are commonly designed for small voltage swing and a high V/I ratio in order to minimize Joule losses. Therefore, electric loads supplied by fuel cells are typically fed by means of an intermediate power voltage regulator. The specifications of such a power converter are to be able to step up the input voltage with a high ratio (a ratio of 10 is a classic situation) and also to work with an excellent efficiency (in order to minimize its size, its weight and its losses) [A. Shahin, B. Huang, J.P. Martin, S. Pierfederici, B. Davat, Energy Conv. Manag. 51, 56 (2010)]. This paper deals with the design of this essential ancillary device. It intends to bring out the best structure for fulfilling this function. Several dc-dc converters with large voltage step-up ratios are introduced. A topology based on a coupled inductor or tapped inductor is closely studied. A detailed modelling is performed with the purpose of providing designing rules. This model is validated with both simulation and implementation. The experimental prototype is based on the following specifications: the fuel cell output voltage ranges from a 50 V open-voltage to a 25 V rated voltage while the load requires a constant 250 V voltage. The studied coupled inductor converter is compared with a classic boost converter commonly used in this voltage elevating application. Even though the voltage regulator faces severe FC specifications, the measured efficiency reaches 96% at the rated power whereas conventional boost efficiency barely achieves 91.5% in the same operating conditions.

  19. Array of solid-state dye-sensitized solar cells with micropatterned TiO2 nanoparticles for a high-voltage power source

    OpenAIRE

    Cho, Seong-Min; Park, Hea-Lim; Kim, Min-Hoi; Kim, Se-Um; Lee, Sin-Doo

    2013-01-01

    We demonstrate an array of solid-state dye-sensitized solar cells (SS-DSSCs) for a high-voltage power source based on micropatterned titanium dioxide nanoparticles (TNPs) as photoanodes connected in series. The underlying concept of patterning the TNP of a few micrometers thick lies on the combination of the lift-off process of transfer-printed patterns of a sacrificial layer and the soft-cure treatment of the TNP for fixation. This sacrificial layer approach allows for high pattern fidelity ...

  20. Analysis of a novel autonomous marine hybrid power generation/energy storage system with a high-voltage direct current link

    OpenAIRE

    Wang, L; Lee, D. J.; W.J. Lee; Chen, Zhe

    2008-01-01

    This paper presents both time-domain and frequency-domain simulated results of a novel marine hybrid renewable-energy power generation/energy storage system (PG/ESS) feeding isolated loads through an high-voltage direct current (HVDC) link. The studied marine PG subsystems comprise both offshore wind turbines andWells turbines to respectively capture wind energy and wave energy from marine wind and oceanwave. In addition to wind-turbine generators(WTGs) andwave-energy turbine generators (WETG...

  1. Repetitive resonant railgun power supply

    Science.gov (United States)

    Honig, Emanuel M. (Los Alamos, NM); Nunnally, William C. (Los Alamos, NM)

    1988-01-01

    A repetitive resonant railgun power supply provides energy for repetitively propelling projectiles from a pair of parallel rails. The supply comprises an energy storage capacitor, a storage inductor to form a resonant circuit with the energy storage capacitor and a magnetic switch to transfer energy between the resonant circuit and the pair of parallel rails for the propelling of projectiles.

  2. RICH High Voltages & PDF Analysis @ LHCb

    CERN Multimedia

    Fanchini, E

    2009-01-01

    In the LHCb experiment an important issue is the identification of the hadrons of the final states of the B mesons decays. Two RICH subdetectors are devoted to this task, and the Hybrid Photon Detectors (HPDs) are the photodetectors used to detect Cherenkov light. In this poster there is a description of how the very high voltage (-18 KV) supply stability used to power the HPDs is monitored. It is also presented the basics of a study which can be done with the first collision data: the analysis of the dimuons from the Drell-Yan process. This process is well known and the acceptance of the LHCb detector in terms of pseudorapidity will be very useful to improve the knowledge of the proton structure functions or, alternatively, try to estimate the luminosity from it.

  3. LHCb calorimeters high voltage system

    International Nuclear Information System (INIS)

    The calorimeter system in LHCb aims to identify electrons, photons and hadrons. All calorimeters are equipped with Hamamatsu photo tubes as devices for light to signal conversion. Eight thousand R7899-20 tubes are used for electromagnetic and hadronic calorimeters and two hundred 64 channels multi-anode R7600-00-M64 for Scintillator-Pad/Preshower detectors. The calorimeter high voltage (HV) system is based on a Cockroft Walton (CW) voltage converter and a control board connected to the Experiment Control System (ECS) by serial bus. The base of each photomultiplier tube (PMT) is built with a high voltage converter and constructed on an individual printed circuit board, using compact surface mount components. The base is attached directly to the PMT. There are no HV cables in the system. A Field Programmable Gate Array (FPGA) is used on the control board as an interface between the ECS and the 200 control channels. The FPGA includes also additional functionalities allowing automated monitoring and ramp up of the high voltage values. This paper describes the HV system architecture, some technical details of the electronics implementation and summarizes the system performance. This safe and low power consumption HV electronic system for the photomultiplier tubes can be used for various biomedical apparatus too

  4. Nuclear power and uranium supply

    International Nuclear Information System (INIS)

    The paper provides an overview of the global supply/demand situation for uranium from the perspective of the world's leading uranium producer and exporter. Projected trends in nuclear power growth are summarised, with emphasis on the Pacific Region. The supply capability of the major uranium-producing countries, including those in the Pacific Region are reviewed in terms of current resource and production levels, and production capability that is likely to be in place by the end of the century. The potential for additional discoveries that might lead to new producing areas is considered. The supply/demand balance, which depends on the uncommitted supply and the unfulfilled demand, is assessed, along with implications for the uranium market. Canada's domestic uranium supply situation is summarised, along with a brief review of the needs for its domestic nuclear power program and its role as a supplier of uranium to world markets

  5. High voltage engineering fundamentals

    CERN Document Server

    Kuffel, E; Hammond, P

    1984-01-01

    Provides a comprehensive treatment of high voltage engineering fundamentals at the introductory and intermediate levels. It covers: techniques used for generation and measurement of high direct, alternating and surge voltages for general application in industrial testing and selected special examples found in basic research; analytical and numerical calculation of electrostatic fields in simple practical insulation system; basic ionisation and decay processes in gases and breakdown mechanisms of gaseous, liquid and solid dielectrics; partial discharges and modern discharge detectors; and over

  6. Design & Fabrication of a High-Voltage Photovoltaic Cell

    Energy Technology Data Exchange (ETDEWEB)

    Felder, Jennifer; /North Carolina State U. /SLAC

    2012-09-05

    Silicon photovoltaic (PV) cells are alternative energy sources that are important in sustainable power generation. Currently, applications of PV cells are limited by the low output voltage and somewhat low efficiency of such devices. In light of this fact, this project investigates the possibility of fabricating high-voltage PV cells on float-zone silicon wafers having output voltages ranging from 50 V to 2000 V. Three designs with different geometries of diffusion layers were simulated and compared in terms of metal coverage, recombination, built-in potential, and conduction current density. One design was then chosen and optimized to be implemented in the final device design. The results of the simulation serve as a feasibility test for the design concept and provide supportive evidence of the effectiveness of silicon PV cells as high-voltage power supplies.

  7. High voltage electrical injuries

    International Nuclear Information System (INIS)

    Objective: To highlight the devastating nature and consequences of high voltage electrical injuries and to stress the need for its prevention. Design: It was a retrospective study. Place and duration of study: The study was conducted at Army Burn Centre, Combined Military Hospital Kharian Cantonment, between January 1,1998 to December 31, 2000. Subjects and Methods: All the patients reporting to Army Burn Centre with high voltage electrical injuries were included in the study. The epidemiology of these injuries were studied along with the pattern of their management and outcome in terms of mortality and morbidity. Results: Of all the patients admitted to the Army Burn Center, 5.94% were affected with electrical injuries. They were predominantly males in a ratio of 9.75:1 and mostly in the 3rd and 4th decades of their lives. Seventy percent of these injuries were injuries were work-related and 75% had associated surface burns. There was significant mortality rate of 18.6% and a limb amputation rate of 80% along with professional disability rate of 91% rendering it a highly morbid condition. Conclusion: This study stresses the necessity to educate the general public with regard to the devastating nature of high voltage electrical injury and highlight the importance of prevention. (author)

  8. Restructuring power supply in Germany

    International Nuclear Information System (INIS)

    According to recent calculations of the Umweltbundesamt (Federal Environmental Office), all German nuclear power plants can be decommissioned from 2017. This will result neither in supply shortages nor in higher electricity rates, and Germany's climate protection goals will not be in danger either. There will be no need to import nuclear power from other countries. (orig.)

  9. Design of auto-control high-voltage control system of pulsed neutron generator

    International Nuclear Information System (INIS)

    It is difficult to produce multiple anode controlling time sequences under different logging mode for the high-voltage control system of the conventional pulsed neutron generator. It is also difficult realize sequential control among anode high-voltage, filament power supply and target voltage to make neutron yield stable. To these problems, an auto-control high-voltage system of neutron pulsed generator was designed. It not only can achieve anode high-voltage double blast time sequences, which can measure multiple neutron blast time sequences such as ?, activated spectrum, etc. under inelastic scattering mode, but also can realize neutron generator real-time measurement of multi-state parameters and auto-control such as target voltage pulse width modulation (PWM), filament current, anode current, etc., there by it can produce stable neutron yield and realize stable and accurate measurement of the pulsed neutron full spectral loging tool. (authors)

  10. Tokamak poloidal field power supplies

    International Nuclear Information System (INIS)

    The present generation of large tokamak experiments all make large electric power demands to supply their four main pulsed loads (toroidal field coils, poloidal field coils, poloidal field amplifiers and additional heating). These individual load requirements are described for three tokamaks, and the overall pulses are compared with the capabilities of their external bulk power supply systems. The technical and economic arguments for supplying the poloidal field coils from flywheel-generator-convertors are discussed. Typical poloidal field current and voltage requirements are described, and are seen to involve the removal of magnetic energy at very high power levels during one of the five phases of a tokamak's operation. This is conveniently achieved by using DC interrupters to divert the current into discharge resistors, and the techniques available for DC interruption are reviewed. The complete poloidal field power supply circuit is described, including its performance during each of the five phases. Seven fault conditions are identified and their impact on the design is discussed. The influence of the rectifier on the generator design and performance is examined, with particular reference to the harmonics. In concluding, mention is made of future commerical fusion reactors and their power supplies. (Author)

  11. Balun technology for bipolar pulsed power supply

    International Nuclear Information System (INIS)

    A new type slotted pipe kicker with advantage of low coupling impedance is adopted for the major upgrading of the Beijing Electron Positron Collider (BEPC II). A bipolar pulsed power supply is needed for the new type kicker. In order to avoid difficulties caused by the floating-thyratron scheme, a balun is introduced into the LC series resonance circuit with a grounded thyratron. The current balance degree between primary and secondary coils must be considered for the balun as a high-voltage fast-pulsed transformer for the special purpose. The unbalanced currents include magnetizing current and equivalent current of eddy-current loss in core. A nanocrystalline tape-wound toroid annealed in transverse magnetic field is chosen for the balun. To reduce leakage inductance, a simply parallel flat structure is adopted in design of transformer primary and secondary conductors. The test results on the prototype confirm the design theory and current balance degree of the balun reaches the design target of D<1%. (authors)

  12. Magnetically switched power supply system for lasers

    Science.gov (United States)

    Pacala, Thomas J. (inventor)

    1987-01-01

    A laser power supply system is described in which separate pulses are utilized to avalanche ionize the gas within the laser and then produce a sustained discharge to cause the gas to emit light energy. A pulsed voltage source is used to charge a storage device such as a distributed capacitance. A transmission line or other suitable electrical conductor connects the storage device to the laser. A saturable inductor switch is coupled in the transmission line for containing the energy within the storage device until the voltage level across the storage device reaches a predetermined level, which level is less than that required to avalanche ionize the gas. An avalanche ionization pulse generating circuit is coupled to the laser for generating a high voltage pulse of sufficient amplitude to avalanche ionize the laser gas. Once the laser gas is avalanche ionized, the energy within the storage device is discharged through the saturable inductor switch into the laser to provide the sustained discharge. The avalanche ionization generating circuit may include a separate voltage source which is connected across the laser or may be in the form of a voltage multiplier circuit connected between the storage device and the laser.

  13. ORION downconverter and power supply

    Science.gov (United States)

    Nishimura, H. G.

    1982-01-01

    The receiver subsystem supplies the front end assembly (downconverter) and power supply for the ORION Mobile Station. These assemblies are designed to withstand severe environmental conditions. The mechanical, electronic, environmental and maintenance design considerations encountered during the design phase of this project are discussed. The two channel S/X downconverter has a 400 MHz bandwidth channel. Phase stability of 2 and 7 deg at S- and X-bands, respectively, is achieved with a temperature stabilized first local oscillator.

  14. Klystron bias power supplies for Indus-2 synchrotron radiation source

    International Nuclear Information System (INIS)

    The functioning of an alternating current (AC) voltage regulator based high voltage direct current (HVDC) power supplies with better input and output performances has been presented in this paper. The authors have incorporated a 3-phase series limiting inductor, along with detuned passive filter in each power supply, to take care of line harmonics and the input power factor (IPF), which is simple, cost effective, reliable and provides input performance matching that of an equivalent active filter. Such arrangement has special significance for controlled HVDC power supplies supplying to fixed load but operated from widely varying input voltages. It achieves line voltage total harmonic distortion (THD) below 4% and IPF better than 0.97, for 415 V - 30% to 415 V + 10% variations in 3-phase input voltages. A properly designed crowbar, along with suitable limiting elements, is incorporated in each power supply and stringent wire survivability tests were carried out to limit klystron fault energy below 10 Joules. Several simulated waveforms and experiment results are also presented. (author)

  15. Gyrotron and power supply development for upgrading the electron cyclotron heating system on DIII-D

    Energy Technology Data Exchange (ETDEWEB)

    Tooker, Joseph F., E-mail: tooker@fusion.gat.com [General Atomics, PO Box 85608, San Diego, CA 92186-5608 (United States); Huynh, Paul [General Atomics, PO Box 85608, San Diego, CA 92186-5608 (United States); Felch, Kevin; Blank, Monica; Borchardt, Philipp; Cauffman, Steve [Communications and Power Industries, 811 Hanson Way, Palo Alto, CA 94304 (United States)

    2013-10-15

    Highlights: ? Vendor completed design of 1.5 MW, 117.5 GHz gyrotron for DIII-D. ? Fabrication of gyrotron by vendor underway. ? Finalizing design of solid-state high voltage modulator for cathode power supply. ? Fabrication of solid-state high voltage modulator has begun. ? Finalizing design of high voltage linear amplifier for gyrotron body power supply. -- Abstract: An upgrade of the electron cyclotron heating system on DIII-D to almost 15 MW is being planned which will expand it from a system with six 1 MW 110 GHz gyrotrons to one with ten gyrotrons. A depressed collector 1.2 MW 110 GHz gyrotron is being commissioned as the seventh gyrotron. A new 117.5 GHz 1.5 MW depressed collector gyrotron has been designed, and the first article will be the eighth gyrotron. Two more are planned, increasing the system to ten total gyrotrons, and the existing 1 MW gyrotrons will subsequently be replaced with 1.5 MW gyrotrons. Communications and Power Industries completed the design of the 117.5 GHz gyrotron, and are now fabricating the first article. The design was optimized for a nominal 1.5 MW at a beam voltage of 105 kV, collector potential depression of 30 kV, and beam current of 50 A, but can achieve 1.8 MW at 60 A. The design of the collector permits modulation above 100 Hz by either the body or the cathode power supply, or both, while modulation below 100 Hz must use only the cathode power supply. General Atomics is developing solid-state power supplies for this upgrade: a solid-state modulator for the cathode power supply and a linear high voltage amplifier for the body power supply. The solid-state modulator has series-connected insulated-gate bipolar transistors that are switched at a fixed frequency by a pulse-width modulation regulator to control the output voltage. The design of the linear high voltage amplifier has series-connected transistors to control the output voltage, which was successfully demonstrated in a proof-of-principle test at 2 kV. The designs of complete power supplies are progressing. The design features of the 117.5 GHz 1.5 MW gyrotron and the solid-state cathode and body power supplies will be described and the current status and plans are presented.

  16. Gyrotron and power supply development for upgrading the electron cyclotron heating system on DIII-D

    International Nuclear Information System (INIS)

    Highlights: ? Vendor completed design of 1.5 MW, 117.5 GHz gyrotron for DIII-D. ? Fabrication of gyrotron by vendor underway. ? Finalizing design of solid-state high voltage modulator for cathode power supply. ? Fabrication of solid-state high voltage modulator has begun. ? Finalizing design of high voltage linear amplifier for gyrotron body power supply. -- Abstract: An upgrade of the electron cyclotron heating system on DIII-D to almost 15 MW is being planned which will expand it from a system with six 1 MW 110 GHz gyrotrons to one with ten gyrotrons. A depressed collector 1.2 MW 110 GHz gyrotron is being commissioned as the seventh gyrotron. A new 117.5 GHz 1.5 MW depressed collector gyrotron has been designed, and the first article will be the eighth gyrotron. Two more are planned, increasing the system to ten total gyrotrons, and the existing 1 MW gyrotrons will subsequently be replaced with 1.5 MW gyrotrons. Communications and Power Industries completed the design of the 117.5 GHz gyrotron, and are now fabricating the first article. The design was optimized for a nominal 1.5 MW at a beam voltage of 105 kV, collector potential depression of 30 kV, and beam current of 50 A, but can achieve 1.8 MW at 60 A. The design of the collector permits modulation above 100 Hz by either the body or the cathode power supply, or both, while modulation below 100 Hz must use only the cathode power supply. General Atomics is developing solid-state power supplies for this upgrade: a solid-state modulator for the cathode power supply and a linear high voltage amplifier for the body power supply. The solid-state modulator has series-connected insulated-gate bipolar transistors that are switched at a fixed frequency by a pulse-width modulation regulator to control the output voltage. The design of the linear high voltage amplifier has series-connected transistors to control the output voltage, which was successfully demonstrated in a proof-of-principle test at 2 kV. The designs of complete power supplies are progressing. The design features of the 117.5 GHz 1.5 MW gyrotron and the solid-state cathode and body power supplies will be described and the current status and plans are presented

  17. FFT Analysis of a Series Loaded Resonant Converter-Based Power Supply for Pulsed Power Applications

    International Nuclear Information System (INIS)

    An impulse power supply has been designed, simulated, and tested in order to feed the primary of a high-frequency transformer. Pulse power system has been widely used for plasma applications. The operational principle of the pulse power system is that the energy from the input source is stored in the capacitor bank device through a dc-dc converter. Then, when a discharging signal is given, the stored energy is released to the load. The new family of ZCS converters is suitable for high-power applications using insulated gate bipolar transistors (IGBTs). The power converter can achieve zero switching with the aid of high-frequency transformer. The device is capable of charging a 0.1?F capacitor up to 5 kV which accounts for a charging power of 5 kJ/s. The novel control algorithm is achieved which eminently considers the nonlinear control characteristics of impulse power supply. The required charging voltage, together with the constraint on the charging time, translates into a required maximum power of 10 kW reduced in this initial version to 5 kW. The difficulty to reliably control such a power at the high-voltage side practically forbids any approach featuring a more or less stabilized DC high-voltage to be generated from a conventional 50 Hz transformer through rectification.

  18. Power supplies in Europe

    International Nuclear Information System (INIS)

    The contribution takes a look at the current situation of the internal energy market, for which the EC-Commission demands more competition due to the differing price policies of the individual EC-countries and their effects on industrial policy, in addition due to the free merchandise traffic which is necessary for electricity as well and due to international investments. A first step toward perfecting the internal market for electricity consists in the two directives which the Council of Ministers passed regarding the transit of electricity and the transparency of prices, the first phase of which has been initiated. During the second phase there are plans for permitting liberalization for a limited number of new competitors while orienting oneself to the existing structures. This phase consists in carrying out the following three main tasks: First of all the rights for the production of energy and the construction of power lines should be extended. Second of all, in vertically consolidated enterprises, the concept of decartelization, i.e. the separation of management and accounting must be introduced in the production area and in the transference and distribution sectors. The third tasks consists in giving third parties access to the power-distribution network to a limited degree. The main points of criticism on the part of the power suppliers are the following: - Long-term investments can no longer be made to a sufficient extent. - The individual consumer is placed tent. - The individual consumer is placed at a disadvantage due to the competitive system. - The third-party-access system entails an unnecessary amount of bureaucratization. In closing, the contribution takes a brief look at energy taxes and CO2 stabilization as well as negotiations on the energy charter. (orig./HSCH)

  19. Residential Distance to High-voltage Power Lines and Risk of Neurodegenerative Diseases : a Danish Population-based Case-Control Study

    DEFF Research Database (Denmark)

    Frei, Patrizia; Poulsen, Aslak Harbo

    2013-01-01

    The aim of this study was to investigate the possible association between residential distance to high-voltage power lines and neurodegenerative diseases, especially Alzheimer's disease. A Swiss study previously found increased risk of Alzheimer's disease for people living within 50 m of a power line. A register-based case-control study including all patients diagnosed with neurodegenerative diseases during the years 1994-2010 was conducted among the entire adult population of Denmark. Using conditional logistic regression models, hazard ratios for ever living close to a power line in the time period 5-20 years before diagnosis were computed. The risks for developing dementia, Parkinson's disease, multiple sclerosis, and motor neuron disease were not increased in persons living within close vicinity of a power line. The risk of Alzheimer's disease was not increased for ever living within 50 m of a power line (hazard ratio = 1.04, 95% confidence interval: 0.69, 1.56). No dose-response according to number of years of living within 50 m of a power line was observed, but there were weak indications of an increased risk for persons diagnosed by the age of 75 years. Overall, there was little support for an association between neurodegenerative disease and living close to power lines.

  20. High-voltage vacuum lead-in

    International Nuclear Information System (INIS)

    This paper examines a high-voltage vacuum lead-in for an electron accelerator based on a disk insulator with a dc rating of 300 kV. The potential distribution along the vacuum surface of the insulator is set by gradient rings of a special shape and a resistance divider. The shape of the gradient rings protects the insulator surface from direct exposure to reflected electrons. The lead-in feeds high voltage into the vacuum chamber from a supply by means of a cable whose insulation is created by compressed gas

  1. Specialized device of power supplies

    Directory of Open Access Journals (Sweden)

    Gunchenko Y. A.

    2010-02-01

    Full Text Available The specialized device of power supplies, capable to change parameters of output voltage depending on conditions of environment and parameters of the fed equipment is offered. Examples of its application for feed of the electroluminescent indicator are resulted.

  2. Design of a high voltage input - output ratio dc-dc converter dedicated to small power fuel cell systems

    OpenAIRE

    Béthoux, O.; Cathelin, J.

    2010-01-01

    Abstract Consuming chemical energy, fuel cells produce simultaneously heat, water and useful electrical power [J.M. Andújar, F. Segura, Renew. Sust. Energy Rev. 13, 2309 (2009)], [J. Larminie, A. Dicks, Fuel Cell Systems Explained, 2nd edn. (John Wiley & Sons, 2003)]. As a matter of fact, the voltage generated by a fuel cell strongly depends on both the load power demand and the operating conditions. Besides, as a result of many design aspects, fuel cells ar...

  3. Effects of the reversible hydro power plants (PAHPP) of the Shara hydroelectric system in condition of minimum load state of the Macedonian power system and possibilities for there connection into the Macedonian high voltage network

    International Nuclear Information System (INIS)

    A long term development of the Macedonian power system predicts building of three new hydroelectric power plants, in order to achieve optimal waters usage from the Shara mountains hydrological basin. These hydro power plants will be able to operate in a reversible operation mode. In this paper the effects of these pump-accumulative hydro power plants (PAHPP) when they operated as motor power units in condition of minimum load state of the Macedonian power system are analyzed. Also, the options for connecting these PAHPP into the Macedonian high voltage network are presented. (Original)

  4. High-Voltage, Asymmetric-Waveform Generator

    Science.gov (United States)

    Beegle, Luther W.; Duong, Tuan A.; Duong, Vu A.; Kanik, Isik

    2008-01-01

    The shapes of waveforms generated by commercially available analytical separation devices, such as some types of mass spectrometers and differential mobility spectrometers are, in general, inadequate and result in resolution degradation in output spectra. A waveform generator was designed that would be able to circumvent these shortcomings. It is capable of generating an asymmetric waveform, having a peak amplitude as large as 2 kV and frequency of several megahertz, which can be applied to a capacitive load. In the original intended application, the capacitive load would consist of the drift plates in a differential-mobility spectrometer. The main advantage to be gained by developing the proposed generator is that the shape of the waveform is made nearly optimum for various analytical devices requiring asymmetric-waveform such as differential-mobility spectrometers. In addition, this waveform generator could easily be adjusted to modify the waveform in accordance with changed operational requirements for differential-mobility spectrometers. The capacitive nature of the load is an important consideration in the design of the proposed waveform generator. For example, the design provision for shaping the output waveform is based partly on the principle that (1) the potential (V) on a capacitor is given by V=q/C, where C is the capacitance and q is the charge stored in the capacitor; and, hence (2) the rate of increase or decrease of the potential is similarly proportional to the charging or discharging current. The proposed waveform generator would comprise four functional blocks: a sine-wave generator, a buffer, a voltage shifter, and a high-voltage switch (see Figure 1). The sine-wave generator would include a pair of operational amplifiers in a feedback configuration, the parameters of which would be chosen to obtain a sinusoidal timing signal of the desired frequency. The buffer would introduce a slight delay (approximately equal to 20 ns) but would otherwise leave the fundamental timing signal unchanged. The buffered timing signal would be fed as input to the level shifter. The output of the level shifter would serve as a timing and control signal for the high-voltage switch, causing the switch to alternately be (1) opened, allowing the capacitive load to be charged from a high-voltage DC power supply; then (2) closed to discharge the capacitive load to ground. Hence, the output waveform would closely approximate a series of exponential charging and discharging curves (see Figure 2).

  5. Nanosecond square high voltage pulse generator for electro-optic switch

    Science.gov (United States)

    Feng, Xian-wang; Long, Xing-wu; Tan, Zhong-qi

    2011-07-01

    A scalable square high voltage pulse generator, which has the properties of fast rise time, fast fall time, powerful driving capability, and long lifetime, is presented in this paper by utilizing solid state circuitry. A totem-pole topology is designed to supply a powerful driving capability for the electro-optic (EO) crystal which is of capacitive load. Power MOSFETs are configured in series to sustain high voltage, and proper driving circuits are introduced for the specific MOSFETs configurations. A 3000 V pulse generator with ˜49.04 ns rise time and ˜10.40 ns fall time of the output waveform is presented. This kind of generator is desirable for electro-optic switch. However, it is not specific to EO switch and may have broad applications where high voltage fast switching is required.

  6. A Novel Controller Based 48-Pulse STATCOM for Reactive Power Compensation and Voltage Stabilization in High Voltage Applications

    OpenAIRE

    Padmaja, S. M.; G Tulasiram Das, Dr

    2011-01-01

    These paper presents the dynamic operation of a novel control scheme for Static Synchronous Compensator (STATCOM) based on a new full model comprising a 48-pulse Gate Turn-Off (GTO) thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The novel controller for the STATCOM presented in this paper is based on a decoupled strategy using the direct and quadrature components of the STATCOM current. The complete digital s...

  7. Fermilab D0 overpass power supply system

    International Nuclear Information System (INIS)

    The overpass power supply system consists of two power supplies. A 1 kV, 3600A SCR supply drives eight Main Ring type magnets and must track twice the Main Ring current to within +/-0.1%. The second supply drives trim coils wound inside four of the main magnets. This dual-converter SCR supply, a modified Fermilab H.O.P.S. unit, supplies +/- 50A at +/-30V and it must generate +/-200V swings to buck-out the voltage inductively coupled from the main supply. Both power supply regulators use dead reckoned voltage drive programs to extend their effective bandwidths

  8. Ignitor Electrical Power Supply System

    Science.gov (United States)

    Coletti, Alberto; Coletti, Roberto; Costa, Pietro; Maffia, Giuseppe; Ramogida, Giuseppe; Roccella, Massimo; Santinelli, Maurizio; Starace, Fabio

    2004-11-01

    An iterative optimization process to reduce the total installed electrical power required for Ignitor has been performed, bringing its value down to about 70% of that estimated originally. Ignitor is planned to be installed within the 400 kV Station of Rondissone (near Turin). The required electrical power (1000 MVA / 320 MVAr, including 480 MVAr locally compensated through static system, SVC) has been demonstrated by the technical authority GRTN to be compatible with the Grid capability. The magnet systems of Ignitor are supplied by means of a set of 14, 12 pulse, current regulated, sequentially or internal freewheeling controlled, fully static power amplifier units which are installed inside standard, outdoor-kind containers, located near to the related step-down transformers. Each container can house up to 100 MW, 2x12 pulse power amplifier units. The connection between the power amplifiers and the machine is performed by means of coaxial, outdoor-kind, segregated bus-bars. These choices make the whole power supply system as flexible as possible in terms of the overall layout of the Ignitor plant.

  9. Assessing the hazard from geomagnetically induced currents to the entire high-voltage power network in Spain

    Science.gov (United States)

    Miquel Torta, Joan; Marsal, Santiago; Quintana, Marta

    2014-12-01

    After the good results obtained from an assessment of geomagnetically induced currents (GICs) in a relatively small subset of the Spanish power transmission network, we now present the first attempt to assess vulnerability across the entire Spanish system. At this stage, we have only included the power grid at the voltage level of 400 kV, which contains 173 substations along with their corresponding single or multiple transformers and almost 300 transmission lines; this type of analysis could be extended to include the 220-kV grid, and even the 110-kV lines, if more detailed information becomes available. The geoelectric field that drives the GICs can be derived with the assumption of plane wave geomagnetic variations and a homogeneous or layered conductivity structure. To assess the maximum expected GICs in each transformer as a consequence of extreme geomagnetic storms, a post-event analysis of data from the Ebre Geomagnetic Observatory (EBR) during the 2003 Halloween storm was performed, although other episodes coincident with very abrupt storm onsets, which have proven to be more hazardous at these mid-latitudes, were analyzed as well. Preferred geomagnetic/geoelectric field directions in which the maximum GICs occur are automatically given from the grid model. In addition, EBR digital geomagnetic data were used to infer statistical occurrence probability values and derive the GIC risk at 100-year or 200-year return period scenarios. Comparisons with GIC measurements at one of the transformers allowed us to evaluate the model uncertainties.

  10. The design of the auxiliary power supplies for the TEXTOR neutral injectors

    International Nuclear Information System (INIS)

    The auxiliary power supplies deliver the power of 24*(10 VAC * 60 A) for heating the filaments and the arc power of 24*(150 VDC * 80 A) for the bucket type plasma source of the TEXTOR neutral injector. Both supplies influence the operating characteristic of the plasma source which should be operated in the emission limited regime of the arc current. It is essential for achieving a stable operating point to match the output values of both supplies and the heat up the filaments to the very same temperature i.e. to control the amplitude of heating voltages within a margin of +. 50 mV. The paper describes the filament supply meeting these requirements. It consists of 8 AC-AC-converter modules each connected to a single three phase filament transformer at the injector. The design features and the technical data are given. A further important issue is the joint operation of filament supply and arc supply, both located side to side on a high voltage Faraday's cage being insulated against a voltage of 70 kV. The cage is surrounded by a grounded shield. The capacitive and inductive coupling of these supplies with their housing, coaxial leads, and transformers can be treated by electrical network computations. Results of such computations are presented showing the transient voltage distribution of the high voltage deck and of the auxiliary supplies during a grid breakdown

  11. New development of JFT-2M Tokamak power supply and control system for poloidal field coils

    International Nuclear Information System (INIS)

    This paper presents the configuration and operating performance of the newly extended power supply and control system for the poloidal coils of JFT-2M Tokamak. The power capacity has been almost tripled with the installation of four more power supplies, and the control capability has been greatly enhanced by two sets of circulating current type four-quadrant thyristor converters for V coils, a learning control means for optimal coil current reference patterns, and a high voltage thyristor switch added to the harmonic filter

  12. Abort kicker power supply systems at Fermilab

    International Nuclear Information System (INIS)

    Over the past several years, Fermilab has been operating with a single turn proton abort system in both the superconducting Tevatron and the conventional Main Ring. The abort kicker power supply for this system discharges a lumped capacitance into the inductive magnet load, causing the beam to enter the abort channel. The characteristics of this current waveform are defined by the requirements of the machine operation. The standard fixed target running mode calls for 12 booster batches of beam which leaves a rotating gap in the beams of approx.1.8 ?s. The current waveform is required to rise to 90% of I/sub max/ in this time to avoid beam loss from partially deflected beam. Aperture limitations in both the accelerator and the abort channel demand that the current in the magnets stays above this 90% I/sub max/ for the 21 ?s needed to ensure all the beam has left the machine. The 25 mm displacement needed to cleanly enter the abort channel at 1 TeV corresponds to a maximum current in each of the 4 modules of approx.20 kA. Similar constraints are needed for the Main Ring and Tevatron antiproton abort systems. A unique feature of this design is the high voltage, high current diode assembly used to clip the recharge of the capacitor bank. This allows the current to decay slowly with the L/R time constant of the magnet and diode series combination. Special attention is given to the diode characteristics needed for this passive switching element. Operational experience and proposed upgrades are given for the two operational systems. 2 refs., 4 figs., 1 tab

  13. Abort kicker power supply systems at Fermilab

    International Nuclear Information System (INIS)

    Over the past several years, Fermilab has been operating with a single turn proton abort system in both the superconducting Tevatron and the conventional Main Ring. The abort kicker power supply for this system discharges a lumped capacitance into the inductive magnet load, causing the beam to enter the abort channel. The characteristics of this current waveform are defined by the requirements of the machine operation. The standard fixed target running mode calls for 12 booster batches of beam which leaves a rotating gap in the beam of about1.8 ?s. The current waveform is required to rise to 90% of I /SUB max/ in this time to avoid beam loss from partially deflected beam. Aperture limitations in both the accelerator and the abort channel demand that the current in the magnets stays above this 90% I for the 21 ?s needed to ensure all the beam has /SUP max/ left the machine. The 25 mm displacement needed to cleanly enter the abort channel at 1 TeV corresponds to a maximum current in each of the 4 modules of about20 kA. Similar constraints are needed for the Main Ring and Tevatron antiproton abort systems. A unique feature of this design is the high voltage, high current diode assembly used to clip the recharge of the capacitor bank. This allows the current to decay slowly with the L/R time constant of the magnet and diode series combination. Special attention will be given to the diode characteristics needed for this passive switching element. Operational experience atching element. Operational experience and proposed upgrades will be given for the two operational systems

  14. Compact ome megavolt power supply integrated to a high power (10MW) D-steady state accelerator

    International Nuclear Information System (INIS)

    For the application of neutral injection to drive a toroidal current in future devices, the requirements for a good efficiency of the current generation are an injection energy of 1 MeV, with a steady state power of 100 MW. These power are required for high Te and medium density plasmas. An important issue is the feasibility of a beam system which integrates the power supply with the accelerator. New high voltage power supply technology specifically with regard to packaging should be developped in order to fullfil the condition of compactness and to limit the stored energy. In this paper a compact power supply is examined integrated to a electrostatic accelerator in order to minimize the insulation problems. The others features of this type of supply are: the capability to supply high voltage and high power, the low energy stored in the system, the inherent voltage stability, and the simplicity of the assembly. The accelerators are being designed covering the range of voltages from 1 to 2 MV and power from 5 to 10 MW. (author). 1 ref.; 5 figs

  15. Design of filter circuit in high voltage unit of particle detector

    International Nuclear Information System (INIS)

    To meet high stability, low ripple requirements of High Voltage Unit in Particle radiation detectors, to design a hybrid LC and RC filter circuit to reduce power supply ripple. Through the theoretical analysis, PSpice simulation and test, the results are verified. According to this design, a High Voltage Unit was made in a high-energy particle detector on a Satellite, output voltage ripple coefficient is small, met the design purposes. Test proved that this circuit design, simple, efficient, can provide a reference for this kind of circuit design. (authors)

  16. Analysis of a novel autonomous marine hybrid power generation/energy storage system with a high-voltage direct current link

    DEFF Research Database (Denmark)

    Wang, L.; Lee, D. J.

    2008-01-01

    This paper presents both time-domain and frequency-domain simulated results of a novel marine hybrid renewable-energy power generation/energy storage system (PG/ESS) feeding isolated loads through an high-voltage direct current (HVDC) link. The studied marine PG subsystems comprise both offshore wind turbines andWells turbines to respectively capture wind energy and wave energy from marine wind and oceanwave. In addition to wind-turbine generators(WTGs) andwave-energy turbine generators (WETGs) employed in the studied system, diesel-engine generators (DEGs) and an aqua electrolyzer (AE) absorbing a part of generated energy from WTGs and WETGs to generate available hydrogen for fuel cells (FCs) are also included in the PG subsystems. The ES subsystems consist of a flywheel energy storage system(FESS) and a compressed air energy storage (CAES) system to balance the required energy in the hybrid PG/ESS. It can be concluded from the simulation results that the proposed hybrid marine PG/ESS feeding isolated loads can stably operate to achieve system power-frequency balance condition. Udgivelsesdato: DEC 1

  17. Reactive power supply by distributed generators

    OpenAIRE

    Braun, M.

    2008-01-01

    Distributed reactive power supply is necessary in distribution networks for an optimized network operation. This paper presents first the reactive power supply capabilities of generators connected to the distribution network (distributed generators). In a second step an approach is proposed of determining the energy losses resulting from reactive power supply by distributed generators. The costs for compensating these losses represent the operational costs of reactive power supply. These cost...

  18. Mars sample return power supply

    Science.gov (United States)

    Hoang, Don; Ludwigs, Sharon; Schmitz, Paul; Wright, John

    1988-01-01

    A power supply is designed for a vehicle able to operate on the surface of Mars for a period of 5 to 10 years. This vehicle will be used for sample and data collection. The design is based on the assumption that the vehicle will be unmanned. Also, there will be no means by which components could be repaired or replaced while on the Martian surface. A consequence of this is that all equipment must meet high standards of reliability and, if possible, redundancy. Power will be supplied to the vehicle by means of a General Purpose Heat Source capable of producing a minimum of 7 kW of thermal power. The heat generated from the General Purpose Heat Source will be transferred to a Stirling engine via hot side heat pipes. The Stirling engine will then convert this heat into 2 kW of electrical power. Cold side heat pipes will be used to carry away waste heat, which will be released to the Martian environment via radiators connected to the end of the cold side heat pipes.

  19. Power supply control protocol used at GANIL

    International Nuclear Information System (INIS)

    This document intends to establish specifications for power supply control so that, if complied with by power supply manufacturers, power supplies from any manufacturer can be linked at once to the Ganil Control system. The only points to take care of are reduced to physical link and filling of the data base

  20. 47 CFR 80.1015 - Power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Power supply. 80.1015 Section 80.1015...Bridge-to-Bridge Act § 80.1015 Power supply. (a) There must be readily...under normal load conditions, a power supply sufficient to...

  1. Switching System for Redundant Power Supplies

    Science.gov (United States)

    Bradford, M.; Grant, R.; Parkinson, G.

    1986-01-01

    Load-transfer unit connects airborne computer to standby power supply in case primary supply fails. Concept adaptable to systems in which power interruptions cannot be tolerated; for example, computers with volatile memories, safety equipment, and precise timers. Load-transfer unit monitors voltages and load current. Microprocessor controls transistor switches that connect load to whichever power supply has highest priority and correct voltage.

  2. 49 CFR 236.516 - Power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Power supply. 236.516 Section 236.516...Systems Standards § 236.516 Power supply. Automatic cab signal, train...operate from a separate or isolated power supply. [49 FR 3386, Jan. 26,...

  3. Constant potential high voltage generator

    International Nuclear Information System (INIS)

    An improved high voltage generator is described which may be used with x-ray tubes in computed tomography scanning. A circuit is described which stabilizes the high voltage and thus reduces fluctuations in x-ray energy production. (U.K.)

  4. Fault Analysis of ITER Coil Power Supply System

    International Nuclear Information System (INIS)

    The ITER magnet coils are all designed using superconductors with high current carrying capability. The Toroidal Field (TF) coils operate in a steadystate mode with a current of 68 kA and discharge the stored energy in case of quench with using 9 interleaved Fast Discharge Units (FDUs). The Central Solenoid (CS) coils and Poloidal Field (PF) coils operate in a pulse mode with currents of up to 45 kA and require fast variation of currents inducing more than 10 kV during normal operation on the coil terminals using Switching Network (SN) systems (CSs, PF1 and 6) and Booster and VS converters (PF2 to 5), which are series connected to Main converters. SN and FDU systems comprise high current DC circuit breakers and resistors for generating high voltage (SN) and to dissipate magnetic energy (FDUs). High transient voltages can arise due to the switching operation of SN and FD and the characteristics of resistors and stray components of DC distribution systems. Also, faults in power supply control such as shorts or grounding faults can produce higher voltages between terminals and between terminal and ground. Therefore, the design of the coil insulation, coil terminal regions, feeders, feed throughs, pipe breaks and instrumentation must take account of these high voltages during normal and abnormal conditions. Voltage insulation level can be defined and it is necessary to test the coils at higher voltages, to be sure of reliable performance during the lifetime of operation. ormance during the lifetime of operation. This paper describes the fault analysis of the TF, CS and PF coil power supply systems, taking account of the stray parameter of the power supply and switching systems and inductively coupled superconducting coil models. Resistor grounding systems are included in the simulation model and all fault conditions such as converter hardware and software faults, switching system hardware and software faults, DC short circuits and single grounding faults are simulated. The occurrence of two successive faults is considered for the TF coil power supply and CS/PF coil power supply systems taking account of a single fault. The analysis results are discussed for transient and steady-state during normal and abnormal operations

  5. Diseño de una Fuente de Alto Voltaje / A High Voltage Source Design

    Scientific Electronic Library Online (English)

    José Enrique, Eirez Izquierdo; Fabriciano, Rodríguez González; Sonnia, Pavoni Oliver.

    2013-12-01

    Full Text Available Este documento presenta las experiencias en el diseño de una fuente de alto voltaje, basada en multiplicadores de media onda. La fuente garantizará un voltaje de salida en el orden de 10² V y una corriente en el orden de 10-3 A. Se muestran y analizan resultados experimentales encaminados a su aplic [...] ación en la alimentación de un generador de pulsos de alto voltaje. Abstract in english This paper shows a high voltage power supply design experiences realized by half wave multipliers. The source supplies an output voltage in order of 10² V and current of the order 10-3 A. Experimental results of the power supply applied to a high voltage pulses generator are shown and analyzed. [...

  6. Crowbarless solid state modular HV power supply

    International Nuclear Information System (INIS)

    A prototype development of solid state modular HV power supply is presented here to validate the scheme. This scheme will be utilized for developing 32 kV, 24 Amp HVDC power supplies for 250 kW CW klystrons or for developing 100 kV, 24 Amp HVDC power supplies for 1 MW cw klystrons as their bias supplies. It provides better input parameters and lower output stored energies making the arrangement crowbarless. (author)

  7. Real-Time Feed-backed Anode Power Supply for 170GHz gyrotron in KSTAR

    Science.gov (United States)

    Seok, Bong-Jun; Ahn, Il-kun; Lee, Seung-kyo; Shim, Eun-yong; Bae, Young-soon; Joung, Mi; Joung, Jin-Hyun

    2015-03-01

    3.6 MW (66 kV/55 A) high voltage power supply system was developed for the 170 GHz ECH&CD system in KSTAR. It consists of the cathode power supply (CPS), anode power supply (APS), and body power supply (BPS). Currently, modulation frequency of APS was limited to less than 1 kHz due to the parasitic capacitance of Zener diode circuit including gyrotron. In order to solve these lacks of controllability and high frequency modulation of APS, the existing APS is replaced by a new type of APS and it is tested for KSTAR 170 GHz gyrotron system. This paper presents the new APS design and characteristics and the test results for 170GHz gyrotron in KSTAR ECH system.

  8. Monitoring System for Uninterruptible Power Supply

    OpenAIRE

    Murad, S. A. Z.; Isa, M. N. M.; Rahman, N. A.

    2007-01-01

    In industrial process today, reliability of equipment is very important. Power supply must be able to cater the need of industrial process. In case of power failure, backup power supply system must be able to support the main process plant. This is to ensure smooth operation and product quality. In order to do this, uninterruptible power supply (UPS) system can be used to ensure the reliability, stability and consistency of the entire system. This UPS system must be monitored in order to enab...

  9. Automated power distribution system hardware. [for space station power supplies

    Science.gov (United States)

    Anderson, Paul M.; Martin, James A.; Thomason, Cindy

    1989-01-01

    An automated power distribution system testbed for the space station common modules has been developed. It incorporates automated control and monitoring of a utility-type power system. Automated power system switchgear, control and sensor hardware requirements, hardware design, test results, and potential applications are discussed. The system is designed so that the automated control and monitoring of the power system is compatible with both a 208-V, 20-kHz single-phase AC system and a high-voltage (120 to 150 V) DC system.

  10. Novel piezoelectric transducers for high voltage measurements

    OpenAIRE

    Vázquez Carazo, Alfredo

    2000-01-01

    A prerequisite for safe and stable operation of an electric power system is the accurate and reliable measurement of the system parameters, in particular, current and voltage. Conventionally, this has been achieved on High Voltage (H.V.) systems by expensive, bulky iron-core transformers and also by capacitor transformers. Both of them are increasingly coming under review (chapter 1) in modern power system due to their cost, safety implications for personnel and surrounding plant if failure o...

  11. Alternating polarity power supply control apparatus

    International Nuclear Information System (INIS)

    An electronic switching circuit is provided for controlling transfer of electrical power from an alternating polarity electrical power supply to a load means through use of a field effect transistor device as the primary power controlling element

  12. PC-based control of a high-voltage injector

    International Nuclear Information System (INIS)

    The stability of high voltage injectors is one of the major problems in any accelerator system. Most of the troubles encountered in the normal operation of an accelerator are connected with the ion source and associated high voltage platforms, regardless of the source or high voltage generator type. The quality of the ion beam injected in the accelerator strongly depends on the power supplies used in the injector and on the ability to control the non-electrical parameters (gas-flow, temperature, etc.). A wide used method in controlling is based on optical links between high-voltage platform and computer, the adjustments being more or less automated. Although the method mentioned above can be still useful in injector control, a different approach is presented in this work, i.e., the computer itself is placed inside the high-voltage terminal. Only one optical link is still necessary to connect this computer with an user-friendly host at ground potential. Requirements: - varying and monitoring the filament current; - gas flow control in the ion source; - reading the vacuum values; - current and voltage control for the anodic, magnet, extraction, suppression and lens' sources. Even in the high voltage terminal there are compartments with different voltages regardless the floating ground. In our injector the extraction voltage is applied on the top of the ion source including the filament and the anodic voltage. The extraction voltage is of maximum 30 kV. In this situationage is of maximum 30 kV. In this situation a second optical link is required to transfer the control for the anodic and magnet source power supply assuming the dedicated computer on the floating ground. One PC is placed inside the high voltage terminal and one PC outside the injector. The optical link (more precisely two optical wires) connects the serial ports. The inside computer is equipped with two multipurpose ADC/DAC and digital I/O card. They permit to read or output DC levels ranging between 0 to 10 volts or TTL signals. The filament current control was realized by a stepping motor that rotates a variable resistor through an insulating stick. Two hundred motor steps per complete rotation assumes a very good resolution in driving the filament current between 0 Amps and maximum 40 Amps. The gas flow control is realized by a stepping motor that drives a needle valve. The flow gas can be varied in very small steps. The vacuum read-out is performed by two gauges, Penning and Pirani, providing a 0 to 10 V analog signal. The DC voltages are input to two ADC channels. The current and voltage source control is performed by ADC and DAC channels that drive/read the source output. The outside computer presents an user friendly interface by a Visual Basic program. It permits to vary all the mentioned quantities and reports periodically (at every two seconds) the output values. The user drives the program only with the mouse, having complete control all over the electric hardware inside the injector. A fast reset function is also provided in case of severe malfunction. (author)

  13. Uninterruptible power supply (UPS) systems

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-04-01

    Use of this purchase specification is not mandatory. User should review the document and determine if it meets the user`s purpose. This document contains a fill-in-the-blanks guide specification for the procurement of uninterruptible power supply (UPS) systems greater than 10 kVA, organized as follows: Parts 1 through 7--technical requirements; Appendix A--technical requirements to be included in the proposal; Appendix B--UPS system data sheets to be completed by each bidder (Seller) and submitted with the proposal; Appendix C--general guidelines giving the specifier parameters for selecting a UPS system; it should be read before preparing an actual specification, and is not attached to the specification; Attachment 1--sketches prepared by the purchaser (Owner); Attachment 2--sample title page.

  14. Standardized multiple output power supply

    Science.gov (United States)

    Ragusa, E. V.

    1975-01-01

    A comprehensive program to develop a prototype model of a standardized multiple output power supply for use in space flight applications is described. The prototype unit was tested and evaluated to assure that the design would provide near optimum performance for the planned application. The prototype design used a dc-to-dc converter incorporating reqenerative current feedback with a time-ratio controlled duty cycle to achieve high efficiency over a wide variation of input voltage and output loads. The packaging concept uses a mainframe capable of accommodating up to four inverter/regulator modules with one common input filter and housekeeping module. Each inverter/regulator module provides a maximum of 100 watts or 10 amperes. Each module is adaptable to operate at any voltage between 4.0 volts and 108 volts. The prototype unit contains +5, + or - 15 and +28 volt modules.

  15. Performance and modelling of 70kVdc power supply with solid-state crowbar

    International Nuclear Information System (INIS)

    The experimental activities of tokamak research involve development of high power RF and microwave sources for fusion related heating and current drive applications. High power RF and microwave tubes like Klystron, Gyrotron and Tetrode are in general operated with high voltage DC power supplies. These HVDC power supplies of the order of 70 kVdc, must be equipped with necessary arc fault protection in addition to general over current and over voltage protection. The arc fault protection must act within few microseconds to prevent permanent damage to the RF tube, window, etc. When an arc fault is detected, output voltage of the DC power supply is short circuited using a crowbar device (generally Ignitron, Thyratron, thyristor, rail-gap, etc.) that operates in few microseconds. This diverts the fault current from the load to crowbar device, thereby protecting the load. This is necessary as conventional protection in the power supply input takes ?100 ms to switch-off. The crowbar device must be able to take the fault current till the circuit breaker placed at power supply input is switched off. The arc fault protection is tested for its effectiveness by “wire-burn” test. Full power short circuit of ?1.5 MW DC power supply puts enormous stress on the power supply, utility and the crowbar, therefore frequent wire-burn testing is to be avoided. This report presents simulation of wire-burn test using PSIM software. Optimization of the component values without conducting actual wire-burn test could be achieved

  16. Bulk water distribution power supply failures

    Scientific Electronic Library Online (English)

    D T, Nel; J, Haarhoff.

    2011-04-01

    Full Text Available This paper considers the probability of power supply failures at bulk water distribution pump stations. Electrical power supply is important within the bulk water distribution environment, particularly when pumping is required. Reliability of power supply is commonly expressed by means of indices, s [...] uch as amongst others, the SAIDI and SAIFI indices as defined by the Institute of Electrical and Electronics Engineering (IEEE). These indices are used to calculate the probability of failure associated with power supply. Data was obtained from a number of sources and used to benchmark the reliability of South African power supply against that of other countries. The reliability of power supply from seven South African Water Board (Rand Water) pump stations is also analysed. Limited data seems to be available that allows one to quantify the reliability of pump systems, taking into account the reliability of the various system components.

  17. 46 CFR 169.688 - Power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Power supply. 169.688 Section 169.688...Gross Tons and Over § 169.688 Power supply. (a) The requirements of...generator is used to provide electric power for any vital system...

  18. Compact Digital High Voltage Charger

    CERN Document Server

    Li, Ge

    2005-01-01

    The operation of classical resonant circuit developed for the pulse energizing is investigated. The HV pulse or generator is very compact by a soft switching circuit made up of IGBT working at over 30 kHZ. The frequencies of macro pulses and?pulses can be arbitrarily tuned below resonant frequency to digitalize the HV pulse power. The?pulses can also be connected by filter circuit to get the HVDC power. The circuit topology is given and its novel control logic is analyzed by flowchart. The circuit is part of a system consisting of a AC or DC LV power supply, a pulse transformer, the pulse generator implemented by LV capacitor and leakage inductance of the transformer, a HV DC or pulse power supply and the charged HV capacitor of the modulators.

  19. Expert system for space power supplies

    International Nuclear Information System (INIS)

    Design and evaluation of space power supplies involves many qualitative, uncertain and heuristic factors that cannot be handled by conventional algorithmic computer programs. The authors are applying Artificial Intelligence/Expert Systems techniques to provide tools for designers and managers for the synthesis and analysis of space power supplies. The authors have evaluated the feasibility of an Expert System for the identification and selection of supplies for a wide range of NASA missions of various power levels (P) and durations

  20. Bulk water distribution power supply failures

    OpenAIRE

    Nel, D. T.; Haarhoff, J.

    2011-01-01

    This paper considers the probability of power supply failures at bulk water distribution pump stations. Electrical power supply is important within the bulk water distribution environment, particularly when pumping is required. Reliability of power supply is commonly expressed by means of indices, such as amongst others, the SAIDI and SAIFI indices as defined by the Institute of Electrical and Electronics Engineering (IEEE). These indices are used to calculate the probability of failure assoc...

  1. Baseball II-T multiple beam project 50 kV, 80 amp, power supply system for sustaining neutral beam sources

    International Nuclear Information System (INIS)

    This document describes a high power, high voltage power supply system required to operate sustaining neutral beam (NB) sources as would be used in the Baseball II-T Multiple Beam Project. Two such systems would be needed. Appended are site plan installation drawings

  2. Power flow and efficiency in supplying systems of arc plasma generators

    International Nuclear Information System (INIS)

    An arc plasma generator requires a supplying system of several hundred kVA and with such operating characteristics as to ignite the discharge at a high voltage of 10 to 20 kV and then to maintain it at a voltage ten times lower. There are many various types of arc plasma generators and they differ considerably from one another depending on their application, construction and kind of discharge used for plasma generation. An arc plasma generator with a gliding arc and the supplying systems are discussed, this mainly from the point of view of power flow and efficiency. (author)

  3. Simplified design of switching power supplies

    CERN Document Server

    Lenk, John

    1995-01-01

    * Describes the operation of each circuit in detail * Examines a wide selection of external components that modify the IC package characteristics * Provides hands-on, essential information for designing a switching power supply Simplified Design of Switching Power Supplies is an all-inclusive, one-stop guide to switching power-supply design. Step-by-step instructions and diagrams render this book essential for the student and the experimenter, as well as the design professional. Simplified Design of Switching Power Supplies concentrates on the use of IC regulators. All popular forms of swit

  4. Design of a prototype of a van de Graaf high voltage generator

    International Nuclear Information System (INIS)

    Prototype of a Generator van de Graaf which operates at atmospheric pressure is constructed. The electrode is made of copper with the diameter of 70 cm and with the height of 75 cm. Colomns are made of pralon and rubber belt and work with a rotary motor 1/3 HP, 1400 cycles per sec. A high voltage power supply of 6000 V is regulated with a transformator 110 V which is amplified by 4 stages Cockroft Walton system. (author)

  5. Design and development of HV power supply with crowbar protection for screen electrode of RF amplifier

    International Nuclear Information System (INIS)

    K-130 room temperature Cyclotron is being renovated at VECC. Radio frequency system is most vital part of cyclotron which is also under modification. The screen biasing plays most critical role in tetrode power amplifiers. A high voltage power supply (1.5 kV and 1.0 A) with fast crowbar protection is required for screen electrode biasing of rf amplifier tube. This power supply is facilitated with primary variac control regulation loop. The EIMAC 4CW2000 tube is connected in shunt for closed loop ripple rejection of load. This active ripple rejecter reduces capacitor filter size as well as stored energy. Crowbar protection is incorporated by using thyristers. Crowbar protection scheme is designed in such a way, it divert the energy from screen electrode, in case any unfavourable condition occurring with tube. This paper presents detailed design, development and testing results of HV power supply for screen electrodes with fast crowbar protection. (author)

  6. High Frequency Power Supply for Electrostatic Precipitators in Thermal Power Plants

    Directory of Open Access Journals (Sweden)

    Slobodan Vukosavi?

    2011-06-01

    Full Text Available Electrostatic precipitators (ESP or electrofilters remove flying ashes and fine particles from the flue gas in thermal power plants, before passing the gas into the chimney. Maximum allowable value of dust is 50 mg/m3 and it requires that the efficiency of the ESPs better than 99%, which calls for an increase of active surface of the electrodes, hence increasing the filter volume and the weight of steel used for the filter. In previous decades, electrostatic precipitators in thermal power plants were fed by thyristor controlled, single-phase fed devices having a high degree of reliability, but with a relatively low collection efficiency, hence requiring large effective surface of the collection plates and a large weight of steel construction in order to achieve the prescribed emission limits. Collection efficiency and energy efficiency of the electrostatic precipitator can be increased by applying high frequency high voltage power supply (HF HV. Electrical engineering faculty of the University of Belgrade (ETF has developed technology and HF HV equipment for the ESP power supply. This solution was subjected to extensive experimental investigation at TE Morava from 2008. to 2010. High frequency power supply is proven to reduce emission two times in controlled conditions while increasing energy efficiency of the precipitator, compared to the conventional thyristor controlled 50 Hz supply. Two high frequency high voltage unit AR70/1000 with parameters 70 kV and 1000 mA are installed at TE Morava and thoroughly testes. It was found that the HF HV power supply of the ESP at TE Morava increases collection efficiency so that emission of fine particles and flying ashes are halved, brought down to only 50% of the emissions encountered with conventional 50 Hz thyristor driven power supplies. On the basis of this study, conclusion is drawn that the equipmentcomprising HF HV supplies are the best solution for new ESP installations, as well as for the reconstruction of existing facilities. The paper describes the topology of the HF HV power supply, power management and controls, and brings the most importantdetails of the implementation. It is found that the HF HV solution achieves several significant improvements over the conventional thyristor system. It is possible to provide more precise control ofthe ESP parameters such as the output voltages and currents. It isalso possible to make a rapid increase or decrease in voltage andto effectuate a very fast response to load changes. Due to this advantages it is possible to suppress the supply quickly in the caseof sparking, reducing the spark energy and the quantity of ionized gasses produced by the electric arc. Reduction in the spark energy is up to 10 times compared to conventional thyristors solution. This means that the erosion of the electrode system is significantly reduced, and that the quality of the collection plates is preserved for much longer periods. At the same time, lower quantity of ionized gasses produced by the spark contribute to much shorter de-ionization intervals, required to quit sparking and evacuate charged particles in order to reinstate the voltage and proceed with the operation. In addition, HF HV power supply provides a significant reduction in size and weight of the complete ESP installation, hence reducing the tons of steel that has to be built in. Therefore, the HF HV power supply may be the key instrument to reducing the cost of the de-dusting ecological equipment. Besides, size and weight reduction leads to cost savings of installation and maintenance. According to estimates, savings in steel may reach 30%, contributing to the overall cost savings of roughly 20%. Within this paper, inaddition to describing the AR70/1000 unit topology and principlesof operation, the paper presents the results and measurements obtained during extensive experimental investigations whereinperformances of 50 Hz based thyristor units with T/R sets arecompared to HF HV power supply.

  7. Multijunction high-voltage solar cell

    Science.gov (United States)

    Evans, J. C., Jr.; Goradia, C.; Chai, A. T.

    1981-01-01

    Multijunction cell allows for fabrication of high-voltage solar cell on single semiconductor wafer. Photovoltaic energy source using cell is combined on wafer with circuit it is to power. Cell consists of many voltage-generating regions internally or externally interconnected to give desired voltage and current combination. For computer applications, module is built on silicon wafer with energy for internal information processing and readouts derived from external light source.

  8. Nuclear reactor power supply system

    International Nuclear Information System (INIS)

    The redundant signals from the sensor assemblies measuring the process parameters of a nuclear reactor power supply are transmitted each in its turn to a protection system which operates to actuate the protection apparatus for signals indicating off-process conditions. Each sensor assembly includes a number of like sensors measuring the same parameters. The sets of process signals derived from the sensor assemblies are each in its turn transmitted from the protection system to the control system which impresses control signals on the reactor or its components to counteract the tendency for conditions to drift off-normal status requiring operation of the protection system. A parameter signal selector prevents a parameter signal which differs from the other parameter signals of the set by more than twice the allowable variation from passing to the control system. Test signals are periodically impressed by a test unit on a selected pair of a selection unit and control channels. This arrangement eliminates the possibility that a single component failure which may be spurious will cause an inadvertent trip of the reactor during test. (author)

  9. High voltage dc-dc converter with dynamic voltage regulation and decoupling during load-generated arcs

    Science.gov (United States)

    Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

    1995-01-01

    A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

  10. High voltage dc--dc converter with dynamic voltage regulation and decoupling during load-generated arcs

    Science.gov (United States)

    Shimer, D.W.; Lange, A.C.

    1995-05-23

    A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules. 5 Figs.

  11. Upgrading the TFTR Transrex Power Supplies

    International Nuclear Information System (INIS)

    In order to provide improved and expanded experimental capabilities, the existing Transrex power supplies at PPPL are to be upgraded and modernized. Each of the 39 power supplies consists of two six pulse silicon controlled rectifier sections forming a twelve pulse power supply. The first modification is to split each supply into two independent six pulse supplies by replacing the existing obsolete twelve pulse firing generator with two commercially available six pulse firing generators. The second change replaces the existing control link with a faster system, with greater capacity, which will allow for independent control of all 78 power supply sections. The third change replaces the existing Computer Automated Measurement and Control (CAMAC) based fault detector with an Experimental Physics and Industrial Control System (EPICS) compatible unit, eliminating the obsolete CAMAC modules. Finally the remaining relay logic and interfaces to the 'Hardwired Control System' will be replaces with a Programmable Logic Controller (PLC)

  12. Simplified design of switching power supplies

    CERN Document Server

    Lenk, John

    1996-01-01

    Simplified Design of Switching Power Supplies is an all-inclusive, one-stop guide to switching power-supply design. Step-by-step instructions and diagrams render this book essential for the student and the experimenter, as well as the design professional.Simplified Design of Switching Power Supplies concentrates on the use of IC regulators. All popular forms of switching supplies, including DC-DC converters, inverters, buck, boost, buck-boost, pulse frequency modulation, pulse width modulation, current-mode control and pulse skipping, are described in detail. The design examples may

  13. Optimal design of switching power supply

    CERN Document Server

    Sha, Zhanyou; Wang, Yanpeng; Ma, Hongtao

    2015-01-01

    A contemporary evaluation of switching power design methods with real world applications Written by a leading author renowned in his field Focuses on switching power supply design, manufacture and debugging Switching power supplies have relevance for contemporary applications including mobile phone chargers, laptops and PCs Based on the authors' successful ""Switching Power Optimized Design 2nd Edition"" (in Chinese) Highly illustrated with design examples of real world applications

  14. Controlled power supply for isotopes separator

    International Nuclear Information System (INIS)

    This equipment is destined to equip the separator of isotopes who is the subject of the CEA report n 138. It includes: - a controlled power supply in voltage. - a controlled power supply in current. The spectra of fluctuations of these assembly is different in the two cases. (authors)

  15. Quality of Power Supply in European View

    Directory of Open Access Journals (Sweden)

    Zdenek Hradilek

    2008-01-01

    Full Text Available This paper deals with comparisons of situation in quality of power supply regulation in some of European countries, which are interested in CEER (Council of European Energy Regulators. Especially we focused our analysis on reliability indices, relationship between supplier and consumer and electric power supply aftereffects. There are discussed differences in each countries and comparison with situation in Czech Republic.

  16. Neutrino horn power supply operational experience

    International Nuclear Information System (INIS)

    The operational experiences required to run the 300 kA pulsed power supply at Brookhaven National Laboratory are given. Various interlocks and monitoring circuits are described and the impact on system reliability are discussed. The initial conditioning process of the power supply during startup is described

  17. Reliability analysis of emergency transfer logic for restoration of power supply to safety related loads

    International Nuclear Information System (INIS)

    Nuclear Power Plants (NPPs) have normal as well as emergency power supply systems. Both the power supply systems are to be reliable for proper operation of the plant. Diesel Generators (DGs) are the main on site power sources in Class III Emergency power supply system in the Nuclear Power Plants. Normally station auxiliary loads are fed by Class IV power supply system and during Class IV failure, essential safety and safety related loads are fed by Class III power supply system. The transfer of these loads from Class IV to Class III power supply is done through Emergency Transfer (EMTR) logic. For effective restoration of loads, EMTR logic has to be reliable. The EMTR scheme covers the sensing of under voltage on the 6.6 kV emergency bus, starting of DG on auto mode, tripping of motor loads and closing of DG circuit breaker and then sequential load pick up at high voltage and medium voltage levels. Both hardwired logic and PLC based logic are adopted for EMTR in NPPs. This paper discusses the reliability analysis carried out for hardwired EMTR logic by constructing fault tree using ISOGRAPH software. The target unavailability of EMTR system for plant safety is 10-4. It is shown that hardwired logic developed meets the target unavailability. (author)

  18. Resonant converter topologies for constant-current power supplies and their applications

    International Nuclear Information System (INIS)

    Power electronics, in general, and power supplies, in particular, is an important field of accelerator technology due to its widespread use, for instance in dc, ramp or pulse magnet power supplies, high voltage power supplies for electrostatic accelerators and RF amplifies, power supplies for vacuum pumps, vacuum gauges, beam diagnostic devices etc. It has been possible to meet stringent performance requirements with the continuing advancement in the field of power electronics. Resonant converters have been an active area of research in power electronics field due to variety of topologies, diverse, peculiar and useful characteristics. While the majority of the previous work on resonant converters has been directed towards developing methods of analysis and control techniques for the mentioned applications, very little has been done to explore their suitability for application as a constant-current power supply, which is either inherently required or can be advantageously applied in power supplies for various accelerator subsystems and other industrial applications such as electric arc welding, laser diode drivers, magnet illumination systems, battery charging, electrochemical processes etc.

  19. High voltage, nonequilibrium MHD disk generators

    International Nuclear Information System (INIS)

    Electrical power generating systems such as those intended for space applications may incur a severe mass and size penalty due to the necessity of a transformer to increase the voltage of the generating system to the level required for the system user bus. This study shows that a non-equilibrium disk magnetohydrodynamic (MHD) energy converter with a gas cooled nuclear reactor prime mover can be optimized to provide a high voltage output eliminating the need for a mass/size penalizing transformer and to maintain the attractive energy conversion efficiency and high power density features of the MHD power conversion system

  20. Development of the Fast Scintillation Detector with Programmable High Voltage Adjustment Suitable for Mössbauer Spectroscopy

    Science.gov (United States)

    Prochazka, R.; Pechousek, J.; Frydrych, J.

    2010-07-01

    This work is focused on a development of a compact fast scintillation detector suitable for Mössbauer spectroscopy (low energy X-ray/?-ray detection) where high counting rates are inevitable. Optimization of this part was necessary for a reliable function, better time resolution and to avoid a detector pulses pile-up effect. The pile-up effect decreases the measurement performance, significantly depends on the source activity and also on the pulse duration. Our new detection unit includes a fast scintillation crystal YAP:Ce, an R6095 photomultiplier tube, a high voltage power supply socket C9028-01 assembly, an AD5252 digital potentiometer with an I2C interface and an AD8000 ultra fast operation preamplifier. The main advantages of this solution lie in a short pulse duration (less than 200 ns), stable operation for high activities, programmable gain of the high voltage supply and compact design in the aluminum housing.

  1. Development of the Fast Scintillation Detector with Programmable High Voltage Adjustment Suitable for Moessbauer Spectroscopy

    International Nuclear Information System (INIS)

    This work is focused on a development of a compact fast scintillation detector suitable for Moessbauer spectroscopy (low energy X-ray/?-ray detection) where high counting rates are inevitable. Optimization of this part was necessary for a reliable function, better time resolution and to avoid a detector pulses pile-up effect. The pile-up effect decreases the measurement performance, significantly depends on the source activity and also on the pulse duration. Our new detection unit includes a fast scintillation crystal YAP:Ce, an R6095 photomultiplier tube, a high voltage power supply socket C9028-01 assembly, an AD5252 digital potentiometer with an I2C interface and an AD8000 ultra fast operation preamplifier. The main advantages of this solution lie in a short pulse duration (less than 200 ns), stable operation for high activities, programmable gain of the high voltage supply and compact design in the aluminum housing.

  2. High-Voltage Terminal Test of Test Stand for 1-MV Electrostatic Accelerator

    CERN Document Server

    Park, Sae-Hoon

    2015-01-01

    The Korea Multipurpose Accelerator Complex (KOMAC) has been developing a 300-kV test stand for a 1-MV electrostatic accelerator ion source. The ion source and accelerating tube will be installed in a high-pressure vessel. The ion source in the high-pressure vessel is required to have a high reliability. The test stand has been proposed and developed to confirm the stable operating conditions of the ion source. The ion source will be tested at the test stand to verify the long-time operating conditions. The test stand comprises a 300-kV high-voltage terminal, a battery for the ion-source power, a 60-Hz inverter, 200-MHz RF power, a 5-kV extraction power supply, a 300-kV accelerating tube, and a vacuum system. The results of the 300-kV high-voltage terminal tests are presented in this paper.

  3. Corrector magnet power supplies for Indus-2

    International Nuclear Information System (INIS)

    First phase of Fast Orbit Feedback System has been successfully implemented for the correction of fast disturbances to electron beam in Indus-2 Synchrotron to provide stable photon flux to beam users. Air cored combined function fast corrector magnets driven by bipolar current controlled power supplies have been used in a fast beam-position controlled feedback loop to achieve this goal. In order to track the fast varying references generated by the beam position controller, higher power supply current loop bandwidth is desired. The beam position corrector system demands large signal bandwidth of the power supply to be of the order of 100 Hz. This paper describes the design of the power and control circuit of the fast corrector power supplies and the results obtained. The power supplies are rated for ±15 A, ±150 V and have ±50 ppm stability. The developed two stage power supply has a half-controlled thyristor converter followed by a four quadrant switching converter at the output. The load current is sensed using high stability shunt. The control circuit consists of cascaded current and voltage loops. Feed-forward of load voltage has been provided to get better tracking of reference. These power supplies fulfil the requirement of the desired large signal current loop bandwidth. The observed small signal bandwidth is 500 Hz. (author)

  4. A crowbarless power supply for klystrons.

    Science.gov (United States)

    Kozu, H; Jumonji, Y; Yamazaki, C; Shoji, Y; Hashimoto, S; Ando, A

    1998-05-01

    A new crowbarless power supply is to be installed at the New SUBARU storage ring. A high-power switching inverter unit eliminates the need for expensive and unstable crowbar circuits for the klystron power supply. It also realizes a very small voltage ripple in the low-frequency region. This is an important characteristic, especially in a quasi-isochronous storage ring such as New SUBARU. PMID:15263515

  5. A new protection system against high voltage vacuum breakdowns

    Science.gov (United States)

    Fumelli, M.; Jequier, F.; Paméla, J.

    1989-12-01

    A passive, electrical fast-switch-off/on system for protecting electrodes subject to fortuitous high voltage vacuum breakdown has been developed. This system is based on the principle of oscillatory discharges in an RLC network coupled with the use of a diode. When a breakdown occurs, the current is automatically and rapidly switched off, preventing the damaging of electrodes and power supply by the electrical arc. The interruption lasts as long as required to stop the short-circuit metal vapor arc: a couple of milliseconds are generally sufficient. Then the current is automatically restored, allowing a rapid recovery of the normal electrical operating conditions. Besides the economical advantages of this circuit, one should note that its operating characteristics are very useful for electrode conditioning. The study of this protection circuit has been made for protecting some elements of the neutral beam injectors in the Tore Supra Tokamak experiment, but its field of application should be quite large.

  6. High voltage processing of the SLC polarized electron gun

    International Nuclear Information System (INIS)

    The SLC polarized electron gun operates at 120 kV with very low dark current to maintain the ultra high vacuum (UHV). This strict requirement protects the extremely sensitive photocathode from contaminants caused by high voltage (HV) activity. Thorough HV processing is thus required x-ray sensitive photographic film, a nanoammeter in series with gun power supply, a radiation meter, a sensitive residual gas analyzer and surface x-ray spectrometry were used to study areas in the gun where HV activity occurred. By reducing the electric field gradients, carefully preparing the HV surfaces and adhering to very strict clean assembly procedures, we found it possible to process the gun so as to reduce both the dark current at operating voltage and the probability of HV discharge. These HV preparation and processing techniques are described

  7. Simplified power supplies for ion thrusters

    Science.gov (United States)

    Gruber, R. P.

    1981-01-01

    A program addressing less complex and potentially lower cost ion thruster systems has been started at the NASA Lewis Research Center. This paper discusses the initial development and demonstration of power supplies with an order of magnitude reduction in parts count, leading to increased reliability at lower weight, while still maintaining thrust system performance. Two new self-regulating keeper power supply circuits were developed and tested. One supply comprises 14 parts and uses an input voltage range of 18 to 36 volts, the other operates from 200 to 400 volts and requires 22 components. A new technique for controlling heater power is also demonstrated.

  8. Monitoring System for Uninterruptible Power Supply

    Directory of Open Access Journals (Sweden)

    S. A.Z. Murad

    2007-01-01

    Full Text Available In industrial process today, reliability of equipment is very important. Power supply must be able to cater the need of industrial process. In case of power failure, backup power supply system must be able to support the main process plant. This is to ensure smooth operation and product quality. In order to do this, uninterruptible power supply (UPS system can be used to ensure the reliability, stability and consistency of the entire system. This UPS system must be monitored in order to enable them to react accordingly in response to a fault or power failure. In this project, monitoring system for UPS was designed by using visual basic (VB to provide a safe and constant 12V DC supply in the case of power disruption. The main power supply, 240V AC was converted to 12V DC as output voltage and a battery will be used as part of the backup system. This system will be able to control the source of power which offers power from LIVE line or power from BATTERY line. The main output voltage was 12V DC and the battery level will be monitored using GUI software created using VB.

  9. Potential application of microporous structured poly(vinylidene fluoride-hexafluoropropylene)/poly(ethylene terephthalate) composite nonwoven separators to high-voltage and high-power lithium-ion batteries

    International Nuclear Information System (INIS)

    Highlights: ? Microporous-structured PVdF-HFP/PET composite nonwoven separators for Li-batteries. ? Well-developed microporous structure and liquid electrolyte wettability. ? Provision of facile ion transport and suppressed growth of cell impedance. ? Superior cell performance at high-voltages/high-current densities. - Abstract: We demonstrate potential application of a new composite non-woven separator, which is comprised of a phase inversion-controlled, microporous polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) gel polymer electrolyte and a polyethylene terephthalate (PET) non-woven support, to high-voltage and high-power lithium-ion batteries. In comparison to a commercialized polyethylene (PE) separator, the composite non-woven separator exhibits distinct improvements in microporous structure and liquid electrolyte wettability. Based on the understanding of the composite non-woven separator, cell performances of the separator at challenging charge/discharge conditions are investigated and discussed in terms of ion transport of the separator and AC impedance of the cell. The aforementioned advantageous features of the composite non-woven separator play a key role in providing facile ion transport and suppressing growth of cell impedance during cycling, which in turn contribute to superior cell performances at harsh charge/discharge conditions such as high voltages and high current densities.

  10. High-voltage air-core pulse transformers

    Energy Technology Data Exchange (ETDEWEB)

    Rohwein, G.J.

    1981-08-01

    High voltage air core pulse transformers are best suited to applications outside the normal ranges of conventional magnetic core transformers. In general these include charge transfer at high power levels and fast pulse generation with comparatively low energy. When properly designed and constructed, they are capable of delivering high energy transfer efficiency and have demonstrated superior high voltage endurance. The general types designed for high voltage pulse generation and energy transfer applications are described. Special emphasis is given to pulse charging systems which operate up to the multi-megavolt range. (WHK)

  11. Nuclear power: energy security and supply assurances

    International Nuclear Information System (INIS)

    Expectations are high for nuclear power. This paper first summarizes recent global and regional projections for the medium-term, including the 2007 updates of IAEA projections plus International Energy Agency and World Energy Technology Outlook projections to 2030 and 2050. One driving force for nuclear power is concern about energy supply security. Two potential obstacles are concerns about increased nuclear weapon proliferation risks, and concerns by some countries about potential politically motivated nuclear fuel supply interruptions. Concerning supply security, the paper reviews different definitions, strategies and costs. Supply security is not free; nor does nuclear power categorically increase energy supply security in all situations. Concerning proliferation and nuclear fuel cut-off risks, the IAEA and others are exploring possible 'assurance of supply' mechanisms with 2 motivations. First, the possibility of a political fuel supply interruption is a non-market disincentive discouraging investment in nuclear power. Fuel supply assurance mechanisms could reduce this disincentive. Second, the risk of interruption creates an incentive for a country to insure against that risk by developing a national enrichment capability. Assurance mechanisms could reduce this incentive, thereby reducing the possible spread of new national enrichment capabilities and any associated weapon proliferation risks. (orig.)

  12. Design of ITER NBI power supply system

    International Nuclear Information System (INIS)

    Power supply system for the ITER neutral beam injector (NBI) whose total injection power is 1 MeV, 50 MW from three modules, has been designed. The power supply system consists of a source power supply for negative ion production/extraction and a DC 1 MV, 45 A power supply for negative ion acceleration. An inverter controlled multi-transformer/rectifier system has been adopted to the acceleration power supply. An inverter frequency of 150 Hz was selected to satisfy required specifications which are rise time of <100 ms, voltage ripple of <10% peak to peak and cut off speed of <200?s. It was confirmed that the rise time, the ripple and the cut off speed is about 50 ms, 7% and <200?s respectively by computation. It was also confirmed that a surge current and an energy input to the ion source at the breakdown can be suppressed lower than 3 kA and 10 J, which are considered to be lower than allowable values. A 1 MV transmission line has been designed from a view point of electric field on the inner conductors and grounded conductor. The results from the design study indicate that all the required specification to the power supply system can be satisfied and that R and D on the transmission line is one of the most important subjects. (author)

  13. High performance magnet power supply optimization

    International Nuclear Information System (INIS)

    Three types of magnet power supply systems for the joint LBL-SLAC proposed accelerator PEP are discussed. The systems considered include a firing circuit and six-pulse controlled rectifier, transistor systems, and a chopper system. (U.S.)

  14. Characteristics of superconducting magnetic energy storage (SMES) energized by a high-voltage SCR converter

    International Nuclear Information System (INIS)

    A small-scale Superconducting Magnetic Energy Storage (SMES) unit was constructed using small magnets and a high-voltage converter, and the characteristics of this unit were examined. The high output voltage of the converter makes it possible for even a small magnet to charge and discharge large power. Moreover, converter control provides adequate protection during quenching. AC and DC filters can be eliminated from the converter system, and ripple voltage does not harm the superconducting magnet. These features demonstrated the potential of an SMES unit as a power system stabilizer and a peak load power supply

  15. 47 CFR 80.915 - Main power supply.

    Science.gov (United States)

    2010-10-01

    ... 2010-10-01 false Main power supply. 80.915 Section 80.915...Passenger Boats § 80.915 Main power supply. (a) There must be readily...under normal load conditions a main power supply sufficient to simultaneously...

  16. 14 CFR 29.1331 - Instruments using a power supply.

    Science.gov (United States)

    2010-01-01

    ...2010-01-01 false Instruments using a power supply. 29.1331 Section 29.1331...29.1331 Instruments using a power supply. For category A rotorcraft...required flight instrument using a power supply must have— (1) Two...

  17. 47 CFR 80.875 - VHF radiotelephone power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 false VHF radiotelephone power supply. 80.875 Section 80.875...80.875 VHF radiotelephone power supply. (a) There must be readily...use under normal load conditions a power supply sufficient to simultaneously...

  18. 49 CFR 236.551 - Power supply voltage; requirement.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Power supply voltage; requirement. 236...Instructions; Locomotives § 236.551 Power supply voltage; requirement. The voltage of power supply shall be maintained within 10...

  19. 47 CFR 80.965 - Reserve power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 false Reserve power supply. 80.965 Section 80.965...Great Lakes § 80.965 Reserve power supply. (a) Each passenger vessel...must be provided with a reserve power supply independent of the...

  20. Optimization of Resonant Power Supply Circuit

    International Nuclear Information System (INIS)

    A Resonant Power Supply has been proposed to power Rapid Cycling Accelerator magnets. The Resonant Power Supply circuits were studied extensively, but were not optimized. Most designs assume equal choke and magnet inductance, however, the variation of inductance affects both performance and cost of the system. This paper optimizes the Resonant Power Supply Circuit by selecting the most feasible choke inductance. For this optimization, a computer model and an approximate design method were developed. The effect of choke inductance on the components rating and cost was determined. It was found that the increase of choke inductance reduces the maximum and increases the minimum choke current, which leads to a significant increase of system losses. The maximum voltage is independent of the choke inductance. The described change of choke current reduces the current of the Bypass Thyristor Switch and the Capacitor Bank Switch, which results in cost reduction. The increase of choke inductance reduces the size of capacitor banks. The loss increase requires larger Make-up Power Supply and ac supply systems. It also increases the operation costs. The system cost function has a minimum, when the choke inductance is about 1.5--2 times larger than the magnet one. The application of the result will lead to a more economical and efficient Resonant Power Supply. 2 refs., 8 figs., 1 tab

  1. Control System for Electromagnet Power Supplies

    OpenAIRE

    Ermolov, E. Y.; Kozak, V. R.; Kuper, E. A.; Medvedko, A. S.; Petrov, S. P.; Veremeenko, V. F.

    2001-01-01

    A set of power supplies (PS) with output power rated from 100 W up to 10 kW for electromagnets powering was developed. These PS have range of current tuning of 60-80 db with high accuracy (error should be less than 0,01%). Some types of power supplies have bipolar output current. The report will describe a set of unified embedded devices for control and measurements of PS incorporated into distributed control systems. These embedded devices includes DAC, ADC with multiplexer...

  2. Design and Construction of a Test Bench to Characterize Efficiency and Reliability of High Voltage Battery Energy Storage Systems

    DEFF Research Database (Denmark)

    Blank, Tobias; Thomas, Stephan

    2010-01-01

    Stationary battery energy storage systems are widely used for uninterruptible power supply systems. Furthermore, they are able to provide grid services. This yields in rising installed power and capacity. One possibility uses high voltage batteries. This results in an improvement of the overall system efficiency. High voltage batteries may be advantageous for future medium voltage DC-grids as well. In all cases, high availability and reliability is indispensable. Investigations on the operating behavior of such systems are needed. For this purpose, a test bench for high voltage storage systems was built to analyze these processes for different battery technologies. A special safety infrastructure for the test bench was developed due to the high voltage and the storable energy of approximately 120 kWh. This paper presents the layout of the test bench for analyzing high voltage batteries with about 4,300 volts including all components, the safety requirements with the resultant safety circuit and the aim of theinvestigations to be performed with the test bench.

  3. Assessment of the maximum supplied electric power for a pure copper vapor laser

    Directory of Open Access Journals (Sweden)

    Valkov Ivan Stoyanov

    2011-12-01

    Full Text Available Based on a previously proposed model for analytical calculation of gas temperature, an improved methodology for determining the threshold of the supplied electric power in the active laser volume is developed. A comparison is made with previous publications. It is noted that the proposed methodology is better at accounting for the processes of heating and cooling of the laser tube. It is shown that the proposed methodology can be applied to a wider range of metal vapor lasers and other high-voltage devices, operating at high temperatures.

  4. Design of a 300-Watt Isolated Power Supply with Minimized Circuit Input-to-Output Parasitic Capacitance

    DEFF Research Database (Denmark)

    Nguyen-Duy, Khiem; Petersen, Lars Press

    2014-01-01

    This paper presents the design of a 300-Watt isolated power supply for MOS gate driver circuit in medium and high voltage applications. The key feature of the developed power supply is having a very low circuit input-to-output parasitic capacitance, thus maximizing its noise immunity. This makes it suitable for modular stacking applications. The converter is a voltage-controlled current source, utilizing a transformer that has an extremely low inter-winding parasitic capacitance. The experiments show that an overall circuit input-to-output parasitic capacitance of 10 pF can be achieved. Design analysis and experimental results are provided to prove the feasibility of the converter.

  5. Power supply strategy in Lithuania

    International Nuclear Information System (INIS)

    Nuclear power plant produces about 80% of electricity in Lithuania. However, national energy strategy as a result of comprehensive assessment of technical, economic and political factors foresees closure of its first unit by 2005. Future fate of the second unit will be defined later in 2004 . Electricity demand requirements will be covered by other modernised power plants burning fossil fuel. This may create some environmental problems, especially if unit 2 would be closed. Earlier closure of the nuclear power plant is a great economical burden not only for the power sector but also to the whole national economy. This requires substantial technical and financial support from EU and other developed countries. (author)

  6. Environmental impact of high voltage substations

    International Nuclear Information System (INIS)

    The first Romanian methodology for simultaneous environmental and human risk evaluation in case of HV installations within substations pertaining to nuclear power stations, based on EU regulation is now applicable in Cernavoda substation. High voltage substations are zones where the environmental impact is focused on electromagnetic field that's causes particular effects in living tissues (human being included). That is the reason why is necessary to identify the potential risk sources, the asses including the way to correct them and to dissimulate the results to the staff and the operational personal.(author)

  7. Commissioning experiences on high voltage generator of 750 KeV DC accelerator at RRCAT, Indore

    International Nuclear Information System (INIS)

    Design approach of high voltage generator for 750 keV DC accelerator, developed at RRCAT Indore, inculcates a unique feature of high frequency operation of symmetrical Cockcroft-Walton voltage generator. Apart from design simplicity and feasibility of modular construction, the high frequency use of symmetrical Cockcroft-Walton circuit gives added advantages of less ripple, better regulation, faster response and low stored energy in the system. Additionally the scheme allows us the use of low voltage, light weight components thus improving the overall economy of the system. The accelerator has been commissioned and made operational at its rated energy of 750 keV in the recent past. With brief introduction on design aspects of high voltage generator and filament power supply of this accelerator, the paper presented here describes the developmental steps of various components with focus on challenges encountered and solutions implemented. Development of high frequency inverter, high voltage ferrite core transformer, compensating inductors, interface bushings, voltage multiplier stack, and filament transformer along with floating power supply for electron emitter of the accelerator has been dealt in detail. The failures encountered during commissioning stages of the accelerator have been reported with measures taken for improvement of the specific components. Intricacies of the reflected capacitance of the multiplier stack and arc-current ground return are also described with their effects on system operation and reliability. (author)

  8. General conditions for electric power supply

    International Nuclear Information System (INIS)

    If it is uncertain whether future power bills will be paid fully, it is admissible to take an action claiming a declaration which states that the electricity rate payment boycotter has no right to non-payment nor a right to withhold payment towards the electricity supply utility, and that the electricity supply utility has the right to stop energy supply because of reduced electricity rate payments effected and/or announced, and to denounce the contract without observing any term of notice. If the electricity buyer reduces a power bill to be paid without any legal grounds, the electricity supply utility has the right to stop power supplies and to denounce the power supply contract without observing any term of notice. The freedom of thought and the freedom of opinion must not be expressed by reducing power bills to be paid. Basic rights discontinue to be effective as soon as a contract or law is broken. A weighing of protected interests is not effected if the exercise of a basic law is unlawful. (orig./HP)

  9. PEP magnet power supply systems

    International Nuclear Information System (INIS)

    The dc electrical requirements of the PEP magnets fall mainly into two categories: high power and current of single polarity and low- power bi-polar. The first category will be thyristor-chopper controlled off common 600 V dc busses. The second group will utilize continuously controlled push-pull transistor actuators. This paper discusses these categories. 1 ref., 2 figs

  10. Proposal of a new type of resonant power supply for synchrotron ring magnets

    International Nuclear Information System (INIS)

    This paper proposes a new scheme of resonant-type synchrotron ring magnet power supply. The link point is that using switching devices (thyristors or diodes etc.) alters the directions of discharging and charging of the resonant capacitance. The all system is powered by low voltage DC power supply(-ies), the high voltage needed by the varying current in the load inductance is automatically generated in the system's working process. The wave forms of the load current are with flat bottom and with or without flat top. A method of making the load current fall fast by using series/parallel of capacitors is given. In this paper some examples are given and they are calculated by MICRO-CAPIII program. (author)

  11. High Input Voltage Discharge Supply for High Power Hall Thrusters Using Silicon Carbide Devices

    Science.gov (United States)

    Pinero, Luis R.; Scheidegger, Robert J.; Aulsio, Michael V.; Birchenough, Arthur G.

    2014-01-01

    A power processing unit for a 15 kW Hall thruster is under development at NASA Glenn Research Center. The unit produces up to 400 VDC with two parallel 7.5 kW discharge modules that operate from a 300 VDC nominal input voltage. Silicon carbide MOSFETs and diodes were used in this design because they were the best choice to handle the high voltage stress while delivering high efficiency and low specific mass. Efficiencies in excess of 97 percent were demonstrated during integration testing with the NASA-300M 20 kW Hall thruster. Electromagnet, cathode keeper, and heater supplies were also developed and will be integrated with the discharge supply into a vacuum-rated brassboard power processing unit with full flight functionality. This design could be evolved into a flight unit for future missions that requires high power electric propulsion.

  12. Advanced modular power supplies for Space Station Freedom

    Science.gov (United States)

    Krauthamer, S.; Gangal, M. D.; Detwiler, R. C.

    1990-01-01

    Viewgraphs and discussion on advanced modular power supplies for Space Station Freedom are presented. Topics covered include concept and characteristics; user power supply applications; and bulk converter application.

  13. Lawrence Berkeley Laboratory power supply system for neutral beam source development

    International Nuclear Information System (INIS)

    The Lawrence Berkeley Laboratory has developed and constructed a 20-kV, 20-A test facility for the development of multi-megawatt neutral atomic beam sources. This facility has been in service for approximately two years and routinely operated at 120-kV, 20-A, 0.5-sec pulses since April 1977. The accelerator power supply system consists of four 50-kV, 20-A, 0.5-sec power modules which may be connected in a variety of series and parallel combinations. The primaries are controlled with ignitron contractors and induction voltage regulators. The high voltage output is shunt regulated with two DP-15-type triodes connected in parallel. A special varistor plate load is used to limit the anode voltage to 60 kV. High voltage switching is done with series connected silicon controlled rectifiers (SCR's). Solid state power supplies of 15 V dc at 2200 A, and 125 V at 2500 A are provided for the source filament and arc power

  14. Innovative use of power integrated modules for DC power supplies

    DEFF Research Database (Denmark)

    Ørndrup Nielsen, Rasmus; Elkiær, Alexander

    2013-01-01

    In this article several innovative ways of utilizing Power Integrated Modules (PIM) as switching device in a DC power supply are presented. PIM have advantages in compactness of design, cost and fast prototype due to easier PCB layout. A PIM converter topology is chosen and designed resulting in an experimental setup. Results from the setup are presented showing the feasibility of using a PIM module as almost all power semiconductors in a DC power supply.

  15. Dc power supplies and hard-tube power conditioning systems

    Energy Technology Data Exchange (ETDEWEB)

    Sarjeant, W.J.

    1980-01-01

    In this lecture, we shall discuss some of the major characteristics of dc power supplies and hard-tube pulsers, along with many of their PCS limiting properties and several of the more powerful vacuum tubes that are currently available for larger hard-tube pulsers systems. The initial topic will be elementary dc power supplies, operating with standard 60 Hz AC input power. The full-wave bridge design will be discussed in detail, illustrating the majority of the significant circuit parameters.

  16. Very low-power power supplies

    Science.gov (United States)

    Roy, N. L.; Hoffmaster, D. K.

    1977-01-01

    Unit may be used in systems requiring milliwatt power for bias voltage functions and can be used as control mechanism for large electric power systems. Logic and energy storage techniques yield processing efficiencies of 1000 to 1 over conventional designs.

  17. 1000-kVA arc power supply

    International Nuclear Information System (INIS)

    Because of ever-increasing power demands for the development of the Oak Ridge duoPIGatron ion source, a continuous-duty arc power supply was constructed for the Medium Energy Test Facility (METF) to furnish power for the plasma generator of experimental ion sources. The power supply utilizes 12-pulse rectification with half-wave switching in a delta and wye full-wave bridge that may be connected in series or parallel. It will deliver 340 V dc, 2500 A to an ion source when series connected and 170 V dc, 5000 A when paralleled connected. Silicon-controlled rectifiers (SCR) in each rectifier bridge can be switched for pulses as short as 10 ms through continuous duty. The filter section that reduces the ripple in the output consists of an inductor-to-capacitor (L-C) filter to smooth the 720-Hz pulses. The power transformer serves as an isolation transformer allowing the secondary to be elevated to the accelerating potential of the ion source. The dc output level is controlled with a 1000-kVA auto transformer connected to the primary of the power transformer. All elevated voltages and currents are monitored at ground potential with an optical telemetry system. This paper describes the power supply in detail, including block diagrams, component specifications, and waveforms when supplying power to an ion source

  18. A Quick Visual Power-Supply Monitor

    Science.gov (United States)

    Taylor, L. W.

    1986-01-01

    Power-supply voltages quickly monitored by circuit equipped with light-emitting-diode (LED) display. Operator looking at display quickly spots whether power output voltage is above, below, or within acceptable limits. Tricolor LED displays high, low, and intermediate output voltages.

  19. High-voltage air-core pulse transformers

    Energy Technology Data Exchange (ETDEWEB)

    Rohwein, G. J.

    1981-01-01

    General types of air core pulse transformers designed for high voltage pulse generation and energy transfer applications are discussed with special emphasis on pulse charging systems which operate up to the multi-megavolt range. The design, operation, dielectric materials, and performance are described. It is concluded that high voltage air core pulse transformers are best suited to applications outside the normal ranges of conventional magnetic core transformers. In general these include charge transfer at high power levels and fast pulse generation with comparatively low energy. When properly designed and constructed, they are capable of delivering high energy transfer efficiency and have demonstrated superior high voltage endurance. The principal disadvantage of high voltage air core transformers is that they are not generally available from commercial sources. Consequently, the potential user must become thoroughly familiar with all aspects of design, fabrication and system application before he can produce a high performance transformer system. (LCL)

  20. Basic technology of synchrotron power supply

    International Nuclear Information System (INIS)

    The thyristor power supply for a synchrotron magnet system is described. An analysis of the magnet strings, power electronics and control system is carried out with a bird's-eye view, however the fundamental description is appeared. It assumes a student and an engineer in fields concepts, which can be the electronics designing in related fields, and a background in Laplas transforms. It presents an example of power supply, which is developed for the synchrotron- cooler ring TARN II at Institute for Nuclear Study, Univ. of Tokyo. (author)

  1. DA?NE magnet power supply system

    International Nuclear Information System (INIS)

    The e+-e-, 1020 MeV at center of mass, Particle Accelerator Complex DA?NE, consists of a linear accelerator (Linac), a damping ring (D.A.), nearly 180 m of transfer lines (T.L.) and two storage rings (S.R.), that intersect each other in two points (I.P.), for ? particle production. The D.A., T.L. and S.R. magnets are powered by means of 462 power supplies, rating from 100 W to 1 MW. The very different output currents, from 10 A to 2300 A, and output voltages, from 8 V to 1300 V, imposed many different technical solution realized by the world industry. This paper describes the Power Supply System giving also a description of the different typologies, their characteristics and control systems. The paper reports also the power supply performances and gives information on their installation and first year operation period

  2. A high voltage gain quasi Z-source isolated DC/DC converter

    DEFF Research Database (Denmark)

    Siwakoti, Yam P.; Blaabjerg, Frede

    2014-01-01

    A compact quasi-Z-source DC/DC converter is presented with high voltage gain, isolated output, and improved efficiency. The improvements in size and performance were achieved by using a square wave inverter with only two output switches driving an isolating transformer in push-pull mode, followed by a voltage doubling output rectifier. The converter is well-suited to applications requiring a high voltage gain, especially renewable energy sources such as photovoltaic and fuel-cell power supplies. To demonstrate the converter's performance a prototype designed to output 400 V at 500 W was constructed and tested. The efficiency at full load varied from 89.0% to 97.4% as the input voltage changed from 44 V to 82 V.

  3. Analysis of Dielectric Electro Active Polymer Actuator and its High Voltage Driving Circuits

    DEFF Research Database (Denmark)

    Thummala, Prasanth; Huang, Lina

    2012-01-01

    Actuators based on dielectric elastomers have promising applications in artificial muscles, space robotics, mechatronics, micro-air vehicles, pneumatic and electric automation technology, heating valves, loud speakers, tissue engineering, surgical tools, wind turbine flaps, toys, rotary motors, and grippers for material handling, etc. This paper focuses on the application of Dielectric Electro Active Polymer (DEAP) technology as an actuation mechanism for different applications. The DEAP material requires very high voltage (~2.5 kV DC) to fully utilize it as an actuator. In this paper the DEAP actuator is analyzed in detail and the actuator structures, for the wind turbine flap and the heating valve applications are shown. Different high voltage switch mode power supply topologies for driving the DEAP actuator are discussed. The simulation and experimental results are discussed.

  4. Development of three channel linear bipolar high voltage amplifier (±2 KV) for electrostatic steerer

    International Nuclear Information System (INIS)

    Electrostatic steerers and scanners are planned for low energy ion beam facilities at IUAC to steer and scan the ion beam on target. The power supplies for electrostatic steerers are high voltage bipolar DC amplifiers and for scanners are bipolar AC amplifiers. To fulfil the requirements a common unit has been designed and assembled for AC and DC applications. It can be used with electrostatic devices in scanning, steering and sweeping of low energy ion beams at high frequencies to attain uniform implantation. The unit consist of three independent limited bandwidth high voltage, linear bipolar amplifiers (for X-axis, Y-axis and Y1-dog leg plates). The unit has been provided with both local and remote control. (author)

  5. Power supply system for JAERI AVF cyclotron

    International Nuclear Information System (INIS)

    An AVF cyclotron (K number : 110) system, which is main accelerator to promote for advanced radiation application using various ion beams, has been introduced in Takasaki Establishment of JAERI. This cyclotron system consists of electro-static magnet, radio frequency, beam diagnostic, computer control vacuum, cooling systems and power supplies for these systems are equipped according to the function of their loads. This report describes the power supply system for the cyclotron. The primary electric-supply lines to TIARA (Takasaki Ion Accelerators for Advanced Radiation Application) facility and the secondary ones to the cyclotron system are explained briefly, then the construction of power supplies for the cyclotron system is illustrated. Measurement results of current stability and ripple are shown in regard to the power supplies for magnets which have occupied in the great part of them, especially. Temperature rise of assembled power cables into a bend sleeve which has penetrated across the shielding wall was estimated, and temperature measurement was also carried out practically. (author)

  6. LHCb Calorimeters High Voltage System

    CERN Document Server

    Gilitsky, Y; Konoplyannikov, Anatoli; Lefrançois, J; Perret, P; Schopper, Andreas; Soldatov, M; Yakimchuk, V

    2007-01-01

    The calorimeter system in LHCb aims to identify electrons, photons and hadrons. All calorimeters are equipped with Hamamatsu photo tubes as devices for light to signal conversion. Eight thousand R7899-20 tubes are used for electromagnetic and hadronic calorimeters and two hundred 64 channels multi-anode R7600-00-M64 for Scintillator-Pad/Preshower detectors. The calorimeter high voltage (HV) system is based on a Cockroft Walton (CW) voltage converter and a control board connected to the Experiment Control System (ECS) by serial bus. The base of each photomultiplier tube (PMT) is built with a high voltage converter and constructed on an individual printed circuit board, using compact surface mount components. The base is attached directly to the PMT. There are no HV cables in the system. A Field Programmable Gate Array (FPGA) is used on the control board as an interface between the ECS and the 200 control channels. The FPGA includes also additional functionalities allowing automated monitoring and ramp up of th...

  7. Efficient chaotic based satellite power supply subsystem

    International Nuclear Information System (INIS)

    In this work, we investigate the use of the Dynamical System Theory to increase the efficiency of the satellite power supply subsystems. The core of a satellite power subsystem relies on its DC/DC converter. This is a very nonlinear system that presents a multitude of phenomena ranging from bifurcations, quasi-periodicity, chaos, coexistence of attractors, among others. The traditional power subsystem design techniques try to avoid these nonlinear phenomena so that it is possible to use linear system theory in small regions about the equilibrium points. Here, we show that more efficiency can be drawn from a power supply subsystem if the DC/DC converter operates in regions of high nonlinearity. In special, if it operates in a chaotic regime, is has an intrinsic sensitivity that can be exploited to efficiently drive the power subsystem over high ranges of power requests by using control of chaos techniques.

  8. A combined compensation method for the output voltage of an insulated core transformer power supply

    Energy Technology Data Exchange (ETDEWEB)

    Yang, L.; Yang, J., E-mail: jyang@mail.hust.edu.cn; Liu, K. F.; Qin, B.; Chen, D. Z. [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)

    2014-06-15

    An insulated core transformer (ICT) power supply is an ideal high-voltage generator for irradiation accelerators with energy lower than 3 MeV. However, there is a significant problem that the structure of the segmented cores leads to an increase in the leakage flux and voltage differences between rectifier disks. A high level of consistency in the output of the disks helps to achieve a compact structure by improving the utilization of both the rectifier components and the insulation distances, and consequently increase the output voltage of the power supply. The output voltages of the disks which are far away from the primary coils need to be improved to reduce their inhomogeneity. In this study, by investigating and comparing the existing compensation methods, a new combined compensation method is proposed, which increases the turns on the secondary coils and employs parallel capacitors to improve the consistency of the disks, while covering the entire operating range of the power supply. This method turns out to be both feasible and effective during the development of an ICT power supply. The non-uniformity of the output voltages of the disks is less than 3.5% from no-load to full-load, and the power supply reaches an output specification of 350 kV/60 mA.

  9. A combined compensation method for the output voltage of an insulated core transformer power supply

    International Nuclear Information System (INIS)

    An insulated core transformer (ICT) power supply is an ideal high-voltage generator for irradiation accelerators with energy lower than 3 MeV. However, there is a significant problem that the structure of the segmented cores leads to an increase in the leakage flux and voltage differences between rectifier disks. A high level of consistency in the output of the disks helps to achieve a compact structure by improving the utilization of both the rectifier components and the insulation distances, and consequently increase the output voltage of the power supply. The output voltages of the disks which are far away from the primary coils need to be improved to reduce their inhomogeneity. In this study, by investigating and comparing the existing compensation methods, a new combined compensation method is proposed, which increases the turns on the secondary coils and employs parallel capacitors to improve the consistency of the disks, while covering the entire operating range of the power supply. This method turns out to be both feasible and effective during the development of an ICT power supply. The non-uniformity of the output voltages of the disks is less than 3.5% from no-load to full-load, and the power supply reaches an output specification of 350 kV/60 mA

  10. Present status of klystron power supply systems for J-PARC linac 2012. Recovery from earthquake disaster, HVDCPS breakdown and energy upgrade

    International Nuclear Information System (INIS)

    After the Great East Japan Earthquake, the klystron power supply systems for the J-PARC 181MeV linac had recovered in last October, and restarted the all-day operations in last November. In this March, the high-voltage DC power supply no.1 (HVDCPS no.1) broke down. The cause was the breakdown of the condensers, which were the parts of the stacks of the diode circuitries. For the linac energy upgrade to 400MeV, the new power supply systems were tested. (author)

  11. Power supply trip control for nuclear reactor

    International Nuclear Information System (INIS)

    A control system for a trip coil in a switchgear mechanism controls the supply of electrical power to a process control device and ensures de-energization of the trip coil shortly after the trip coil is energized. The trip coil is energized not by an independent dc source as in prior art, but from rectified power from a step down transformer supplied from the switchgear output side. The transformer feeds a rectifier which is connected to the trip coil via a trip activation device. The output of the rectifier can be monitored using an optical converter to determine the ability of the control system to activate the trip coil and the condition of the power supplied to the process control device. The control device may be a rod positioner in a pressurised water nuclear reactor. (author)

  12. Lunar surface fission power supplies: Radiation issues

    International Nuclear Information System (INIS)

    A lunar space fission power supply shield that uses a combination of lunar regolith and materials brought from earth may be optimal for early lunar outposts and bases. This type of shield can be designed such that the fission power supply does not have to be moved from its landing configuration, minimizing handling and required equipment on the lunar surface. Mechanisms for removing heat from the lunar regolith are built into the shield, and can be tested on earth. Regolith activation is greatly reduced compared with a shield that uses only regolith, and it is possible to keep the thermal conditions of the fission power supply close to those seen in free space. For a well designed shield, the additional mass required to be brought from earth should be less than 1,000 kg. Detailed radiation transport calculations confirm the feasibility of such a shield

  13. Lunar surface fission power supplies: Radiation issues

    International Nuclear Information System (INIS)

    A lunar space fission power supply shield that uses a combination of lunar regolith and materials brought from earth may be optimal for early lunar outposts and bases. This type of shield can be designed such that the fission power supply does not have to be moved from its landing configuration, minimizing handling and required equipment on the lunar surface. Mechanisms for removing heat from the lunar regolith are built into the shield, and can be tested on earth. Regolith activation is greatly reduced compared with a shield that uses only regolith, and it is possible to keep the thermal conditions of the fission power supply close to these seen in free space. For a well designed shield, the additional mass required to be brought fro earth should be less than 1000 kg. Detailed radiation transport calculations confirm the feasibility of such a shield

  14. Smart Power Supply for Battery-Powered Systems

    Science.gov (United States)

    Krasowski, Michael J.; Greer, Lawrence; Prokop, Norman F.; Flatico, Joseph M.

    2010-01-01

    A power supply for battery-powered systems has been designed with an embedded controller that is capable of monitoring and maintaining batteries, charging hardware, while maintaining output power. The power supply is primarily designed for rovers and other remote science and engineering vehicles, but it can be used in any battery alone, or battery and charging source applications. The supply can function autonomously, or can be connected to a host processor through a serial communications link. It can be programmed a priori or on the fly to return current and voltage readings to a host. It has two output power busses: a constant 24-V direct current nominal bus, and a programmable bus for output from approximately 24 up to approximately 50 V. The programmable bus voltage level, and its output power limit, can be changed on the fly as well. The power supply also offers options to reduce the programmable bus to 24 V when the set power limit is reached, limiting output power in the case of a system fault detected in the system. The smart power supply is based on an embedded 8051-type single-chip microcontroller. This choice was made in that a credible progression to flight (radiation hard, high reliability) can be assumed as many 8051 processors or gate arrays capable of accepting 8051-type core presently exist and will continue to do so for some time. To solve the problem of centralized control, this innovation moves an embedded microcontroller to the power supply and assigns it the task of overseeing the operation and charging of the power supply assets. This embedded processor is connected to the application central processor via a serial data link such that the central processor can request updates of various parameters within the supply, such as battery current, bus voltage, remaining power in battery estimations, etc. This supply has a direct connection to the battery bus for common (quiescent) power application. Because components from multiple vendors may have differing power needs, this supply also has a secondary power bus, which can be programmed a priori or on-the-fly to boost the primary battery voltage level from 24 to 50 V to accommodate various loads as they are brought on line. Through voltage and current monitoring, the device can also shield the charging source from overloads, keep it within safe operating modes, and can meter available power to the application and maintain safe operations.

  15. Time-varying system identification of high voltage switches of a power substation with slide-window least-squares parameter estimations

    Science.gov (United States)

    Wang, Zuo-Cai; Ren, Wei-Xin; Chen, Gen-Da

    2013-06-01

    This paper is aimed at identifying the time-varying parameters and ultimate behavior of high voltage switch structures based on a series of full-scale shake table tests with harmonic excitations. Each structure involves a mechanical device for switch-on and switch-off, a friction-based switch, and three porcelain pillars. To identify the structural properties over time, a novel slide-window least-squares estimation method is developed. Each time-varying parameter is firstly approximately expressed by a simple polynomial or exponential function with time in a short slide-window. The time-invariant coefficients of the polynomial or exponential function are then estimated using a least-squares method. Finally, the time-varying parameters can be simply calculated from the estimated polynomial or exponential function. The proposed method is validated by simulated one- and two-story buildings with three kinds of time-varying parameters (stiffness varying abruptly, gradually, and periodically) under earthquake excitations. The application of the proposed method to the tested switch structures demonstrated that the time-varying fundamental frequency of the structures decreased from 7.5 to 6.5 Hz near resonance, which is consistent with the shake table test observations under an excitation of 1.27 and 2.54 mm in stroke. During the shake table tests, all switch structures failed at the bottom of the mechanical device under cyclic loading.

  16. Time-varying system identification of high voltage switches of a power substation with slide-window least-squares parameter estimations

    International Nuclear Information System (INIS)

    This paper is aimed at identifying the time-varying parameters and ultimate behavior of high voltage switch structures based on a series of full-scale shake table tests with harmonic excitations. Each structure involves a mechanical device for switch-on and switch-off, a friction-based switch, and three porcelain pillars. To identify the structural properties over time, a novel slide-window least-squares estimation method is developed. Each time-varying parameter is firstly approximately expressed by a simple polynomial or exponential function with time in a short slide-window. The time-invariant coefficients of the polynomial or exponential function are then estimated using a least-squares method. Finally, the time-varying parameters can be simply calculated from the estimated polynomial or exponential function. The proposed method is validated by simulated one- and two-story buildings with three kinds of time-varying parameters (stiffness varying abruptly, gradually, and periodically) under earthquake excitations. The application of the proposed method to the tested switch structures demonstrated that the time-varying fundamental frequency of the structures decreased from 7.5 to 6.5 Hz near resonance, which is consistent with the shake table test observations under an excitation of 1.27 and 2.54 mm in stroke. During the shake table tests, all switch structures failed at the bottom of the mechanical device under cyclic loading. (paper)g. (paper)

  17. Simulation of capacitor charging power supplies

    Science.gov (United States)

    Newton, S. R.; Nelms, R. M.

    1990-01-01

    By neglecting losses and other nonidealities, the authors were able to derive a simple single-loop equivalent circuit for each mode of operation of the series resonant converter. From these equivalent circuits, a good approximation of the current and voltages within the converter was obtained, despite the simplified approach taken. It is pointed out that designers of capacitor charging power supplies can utilize this approach in deciding what type of control strategy is needed to obtain a desired characteristic. Once the basic topology of the power supply has been determined, a detailed simulation could be implemented using one of the general-purpose software packages available.

  18. High voltage DC semiconductor switch

    International Nuclear Information System (INIS)

    The high voltage DC switch of GTO's (bipolar element turn-off thyristor) and of MOS FET's (unipolar element field-effect transistor), both slave-driven in series connection, have been studied in basic characteristics. In the GTO switch, the 7.5 kV switch module and the 30 kV, 6 A switch as series connection of the four modules were constructed in trial. In the MOS FET switch, the 5 kV switch module and the 30 kV, 2 A switch as series connection of the six modules were constructed in trial. The MOS FET switch is faster by one order of magnitude in current turn-off speed than the GTO switch. The MOS FET switch is suitable for small current, fast switching and the GTO switch for large current, slow switching. (Mori, K.)

  19. Control System for Electromagnet Power Supplies

    CERN Document Server

    Ermolov, E Y; Kuper, E A; Medvedko, A S; Petrov, S P; Veremeenko, V F

    2001-01-01

    A set of power supplies (PS) with output power rated from 100 W up to 10 kW for electromagnets powering was developed. These PS have range of current tuning of 60-80 db with high accuracy (error should be less than 0,01%). Some types of power supplies have bipolar output current. The report will describe a set of unified embedded devices for control and measurements of PS incorporated into distributed control systems. These embedded devices includes DAC, ADC with multiplexers and status Input/Output registers. The devices include microprocessor and allow work with minimal host involving. This capability decreases traffic, provides synchronous tuning of all electromagnet elements of particle accelerator and increases reliability of entire system.

  20. Development of the 320 kA pulsed magnetic horn power supply with a novel energy recovery system for the T2K experiment

    International Nuclear Information System (INIS)

    The 320 kA pulsed magnetic horn power supply with a novel magnetic energy recovery system for the T2K experiment has been developed. The magnetic energy once stored in the horn system during an excitation period by a pulsed current of 320 kA is recovered by a full-bridge circuit to the energy storage capacitors. Four switching arms by high-power thyristors in the full-bridge circuit are actively controlled for an efficient energy recovery process. Operational principle of the energy recovery system was proved by both the simulation study and the high-voltage test operation. Successful operations of the newly developed pulsed magnetic horn power supply were also confirmed by high-voltage test operations. -- Highlights: ?The 320 kA pulsed power supply for the T2K magnetic horn has been developed. ?A novel energy recovery method by a full-bridge circuit has been established. ?Successful operation of the pulsed power supply was confirmed by high-voltage operations

  1. Pulsed power supplied for large laser systems

    International Nuclear Information System (INIS)

    Concepts for pulsed power supplies for laser fusion systems are briefly reviewed. Feasibility of employing an inertial-inductive energy storage scheme in power conditioning for the LLL Nova system is discussed. For the 150 to 200 MJ Nova system, inertial-inductive energy storage appears more favorable than conventional capacitive energy storage. A preliminary design for a homopolar-inertial inductive storage system is briefly presented

  2. Power supply in future: ecological aspects

    International Nuclear Information System (INIS)

    The most important prerequisites for an ecological supply of energy in the future is the opting out of nuclear energy and the completion of the second and third phase of the socio-ecological tax reform. As a part of our energy will continue to be generated on the basis of fossil fuels in the foreseeable future, it is essential that a radical change takes place in the efficiency of fossil energy engineering. In addition to this, any possible energy-saving potential must be exploited; this includes the new energy-saving law, promoting the modernisation of old buildings and modern energy management (heat insulation, heating engineering, warm water heating etc.). For an ecological power supply the share of renewable energies must be increased to form a major pillar of our power supply. The '100,000-roof' programme of the German federal government and the development programme for near-market renewable energy sources form part of this approach. Energy research should shift its orientation and accelerate the conversion of our power supply: priority should be given to developing energy-saving technologies and renewable energy. Supporting municipalities and public utilities is especially important. This means revising the basic conditions of energy laws so that they assist public utilities to face competition as power utilities. (orig.)

  3. Power supply with optical-isolator control

    Science.gov (United States)

    Baker, R. H.; Wheeler, J. T.

    1977-01-01

    Power supply consists of several stages, interconnected and programmed for required output. In capacitor charging mode, transistor switches are closed. Last stage is in series with rectifier that prevents current from flowing backward into circuit. In capacitor discharge mode, transistor switches are closed, and voltage delivered to load is sum of voltages across capacitors.

  4. Arcjet power supply and start circuit

    Science.gov (United States)

    Gruber, Robert P. (inventor)

    1988-01-01

    A dc power supply for spacecraft arcjet thrusters has an integral automatic starting circuit and an output averaging inductor. The output averaging inductor, in series with the load, provides instantaneous current control, and ignition pulse and an isolated signal proportional to the arc voltage. A pulse width modulated converter, close loop configured, is also incorporated to give fast response output current control.

  5. Pulsed power supply for Nova Upgrade

    Science.gov (United States)

    Bacon, J. L.; Kajs, J. P.; Walls, A.; Weldon, W. F.; Zowarka, R. C.

    This report describes work carried out at the Center for Electromechanics at The University of Texas at Austin (CEM-UT). A baseline design of the Nova Upgrade has been completed by Lawrence Livermore National Laboratory. The Nova Upgrade is an 18 beamline Nd:glass laser design utilizing fully relayed 4 x 4 30 cm aperture segmented optical components. The laser thus consists of 288 independent beamlets nominally producing 1.5 to 2.0 MJ of 0.35 micron light in a 3 to 5 ns pulse. The laser design is extremely flexible and will allow a wide range of pulses to irradiate ICF targets. This facility will demonstrate ignition/gain and the scientific feasibility of ICF for energy and defense applications. The pulsed power requirements for the Nova Upgrade are given. CEM-UT was contracted to study and develop a design for a homopolar generator/inductor (HPG/inductor) opening switch system which would satisfy the pulsed power supply requirements of the Nova Upgrade. The Nd:glass laser amplifiers used in the Nova Upgrade will be powered by light from xenon flashlamps. The pulsed power supply for the Nova Upgrade powers the xenon flashlamps. This design and study was for a power supply to drive flashlamps.

  6. Pulsed power supply for Nova Upgrade

    International Nuclear Information System (INIS)

    This report describes work carried out at the Center for Electromechanics at The University of Texas at Austin (CEM-UT). A baseline design of the Nova Upgrade has been completed by Lawrence Livermore National Laboratory. The Nova Upgrade is an 18 beamline Nd: glass laser design utilizing fully relayed 4x4 30 cm aperture segmented optical components. The laser thus consists of 288 independent beamlets nominally producing 1.5 to 2.0 MJ of 0.35 ?m light in a 3 to 5 ns pulse. The laser design is extremely flexible and will allow a wide range of pulses to irradiate ICF targets. This facility will demonstrate ignition/gain and the scientific feasibility of ICF for energy and defense applications. The pulsed power requirements for the Nova Upgrade are given. CEM-UT was contracted to study and develop a design for a homopolar generator/inductor (HPG/inductor) opening switch system which would satisfy the pulsed power supply requirements of the Nova Upgrade. The Nd:glass laser amplifiers used in the Nova Upgrade will be powered by light from xenon flashlamps. The pulsed power supply for the Nova Upgrade powers the xenon flashlamps. This design and study was for a power supply to drive flashlamps

  7. Direct current uninterruptible power supply method and system

    Science.gov (United States)

    Sinha, Gautam

    2003-12-02

    A method and system are described for providing a direct current (DC) uninterruptible power supply with the method including, for example: continuously supplying fuel to a turbine; converting mechanical power from the turbine into alternating current (AC) electrical power; converting the AC electrical power to DC power within a predetermined voltage level range; supplying the DC power to a load; and maintaining a DC load voltage within the predetermined voltage level range by adjusting the amount of fuel supplied to the turbine.

  8. Power supply system for remote site application

    Energy Technology Data Exchange (ETDEWEB)

    Enzenhofer, H.J. [Fisheries and Oceans Canada, Cultus Lake, BC (Canada). Cultus Lake Salmon Research Laboratory; Cronkite, G.M.W.; Holmes, J.A.; Lilja, J. [Fisheries and Oceans Canada, Nanaimo, BC (Canada)

    2007-07-01

    Supplying electrical power for the operation of electronic equipment or appliances in remote locations normally requires the use of portable generators. However, providing a constant flow of fuel for these generators is a challenge if the remote site is being operated on a 24 hour basis. In order to address the impact of continuous noise of the running generator and to minimize regular maintenance requirements, other power sources have been considered as a potential alternative. This report discussed the development of a power supply system that used solar panels, a water generator and a wind turbine to charge a battery bank. Although the use of solar, wind and water as energy sources are not new concepts, there is no commercially available package that provides all the required components for remote site operation. The report described the design, construction and function of individual components of the power supply system, including wiring diagrams, and provided instructions on component assembly and deployment onsite. The report also presented performance test results of a system with a constant demand for 150 W under various climatic conditions such as sun, cloud, and foul weather. The purpose was to determine if alternate battery charging was required. The report also provided information on the costs to construct the system components and purchase the power generating equipment. Last, the report offered recommendations for maximizing the outputs from the solar, wind and water generators. It was concluded that the proposed power supply system is a dependable source of electricity for the operation of electronic appliances for sustained periods. 4 refs., 1 tab., 8 figs.

  9. Design of neutral beam injection power supplies for ITER

    International Nuclear Information System (INIS)

    Design study on a power supply system for the ITER neutral beam injector(NBI) has been performed. Circuits of converter/inverter system and other components of the acceleration power supply whose capacity is 1 MV, 45 A have been designed in detail. Performance of the negative ion production power supplies such as an arc and an extraction power supplies was investigated using the EMTDC code. It was confirmed that ripples of 0.34%p-p for the extraction power supply and 1.7%p-p for the arc power supply are small enough. It was also confirmed that an energy input to a negative ion generator from the arc power supply at an arcing can be suppressed smaller than 8 J. The extraction power supply was designed to suppress the energy input lower than 13 J at the breakdown in the extractor. These performances satisfy the required specification of the power supply system. (author)

  10. Sensitive Ion Pump Current Monitoring Using an In-House Built Ion Pump Power Supply

    International Nuclear Information System (INIS)

    Ion pumps are common vacuum pumps on DC high voltage photoguns and baked-accelerator beamlines. Commercial ion pump power supplies provide a measure of the electrical current drawn by the pump, but typically have resolution to only ?0.1 uA, which corresponds to pressure ?10-9 Torr, a value considerably higher than the minimum pressure required by photoguns and nearby beamline. This submission describes a very sensitive in-house-built ion pump power supply with current monitoring capability good to less than 1 nA, and corresponding pressure in the low-minus;10-11 Torr range. Besides providing 'free' pressure monitoring on a scale equivalent to the best available commercial pressure gauges, the ion pump power supply also serves as a sensitive diagnostic for detecting field emission from the photogun cathode electrode and bad electron beam orbits that could diminish photogun operating lifetime. Since its inception, this ion pump power supply has become an invaluable tool for operating the CEBAF polarized electron source. It is also a very useful low-cost diagnostic for ultrahigh vacuum studies in the laboratory.

  11. Report about the contribution of new technologies to the burial of high and very-high voltage power lines; Rapport sur l'apport de nouvelles technologies dans l'enfouissement des lignes electriques a haute et tres haute tension

    Energy Technology Data Exchange (ETDEWEB)

    Kert, Ch. [Assemblee Nationale, 75 - Paris (France)

    2001-12-01

    Today, high voltage overhead power lines are badly perceived by the population in particular in urban areas and in areas with remarkable landscapes, for their visual impact on the environment and for their possible effect on human health. With the increase of the domestic and foreign power demand, the high voltage grid will develop in the future and the partial burial of power lines can be the first steps towards a solution to these problems. This report makes a worldwide status of the state-of-the-art of power line burial technologies, all voltages considered, and then focusses on the very-high voltage challenge which encounters the most important technological and economical constraints. The technical feasibility has been proven but the lowering of costs needs the development of a real European market of power lines burial. (J.S.)

  12. Development of the 320 kA pulsed magnetic horn power supply with a novel energy recovery system for the T2K experiment

    Science.gov (United States)

    Koseki, Kunio

    2014-01-01

    The 320 kA pulsed magnetic horn power supply with a novel magnetic energy recovery system for the T2K experiment has been developed. The magnetic energy once stored in the horn system during an excitation period by a pulsed current of 320 kA is recovered by a full-bridge circuit to the energy storage capacitors. Four switching arms by high-power thyristors in the full-bridge circuit are actively controlled for an efficient energy recovery process. Operational principle of the energy recovery system was proved by both the simulation study and the high-voltage test operation. Successful operations of the newly developed pulsed magnetic horn power supply were also confirmed by high-voltage test operations.

  13. Bipolar high-repetition-rate high-voltage nanosecond pulser

    International Nuclear Information System (INIS)

    The pulser designed is mainly used for producing corona plasma in waste water treatment system. Also its application in study of dielectric electrical properties will be discussed. The pulser consists of a variable dc power source for high-voltage supply, two graded capacitors for energy storage, and the rotating spark gap switch. The key part is the multielectrode rotating spark gap switch (MER-SGS), which can ensure wider range modulation of pulse repetition rate, longer pulse width, shorter pulse rise time, remarkable electrical field distortion, and greatly favors recovery of the gap insulation strength, insulation design, the life of the switch, etc. The voltage of the output pulses switched by the MER-SGS is in the order of 3-50 kV with pulse rise time of less than 10 ns and pulse repetition rate of 1-3 kHz. An energy of 1.25-125 J per pulse and an average power of up to 10-50 kW are attainable. The highest pulse repetition rate is determined by the driver motor revolution and the electrode number of MER-SGS. Even higher voltage and energy can be switched by adjusting the gas pressure or employing N2 as the insulation gas or enlarging the size of MER-SGS to guarantee enough insulation level

  14. Uninterruptible power supply for the Gentilly Nuclear Power Station

    International Nuclear Information System (INIS)

    The paper describes the uninterruptible power supply (UPS) for a typical control and support emergency systems of a recently built nuclear power station. The field test data obtained during various modes of the UPS operation are also presented and briefly discussed. 5 refs

  15. Power supply control module for magnet power supplies control system of Indus-1

    International Nuclear Information System (INIS)

    Optics in a circular accelerator is mainly governed by magnetic field of the magnets in the path of the electron beam. Magnet Power Supplies Control System controls and monitors the power supplies feeding the magnets required to bend, steer, and focus etc the charged particle beam. New Control System for the Magnet Power Supplies of the Indus-1 is being implemented. Based on distributed control architecture in this system, each power supply is connected to an equipment interface unit, referred to as Power Supply Control Module (PSCM). The PSCMs communicate with the user interface layer through a custom protocol over an RS-485 serial bus. The PSCMs are developed using TMS320F28335 Digital Signal Controller (DSC). These are compact 19'' rack mountable systems. The PSCM provides digital control of eight parameters, status monitoring of eight parameters, current setting, and current monitoring with accuracy better than 0.01% and stability better than ±100 ppm. It features the generation of current reference of any programmed shape particularly required for cycling profile, ramping profile etc. Other than these functions, PSCMs also incorporate some features like synchronized data reading and fast data capturing which are useful for the analysis of transient phases of ramping and cycling. The set reference for current and current read-back are sampled at 1KHz and stored in the 512K Word memories in PSCM. The paper describes the PSCM of the new magnet power supplies control system for Indus-1. (author)

  16. Power supplies for the injector synchrotron quadrupoles and sextupoles

    International Nuclear Information System (INIS)

    This light source note will describe the power supplies for the injector synchrotron quadrupole and sextupole magnets. The injector synchrotron has two families of quadrupole magnets. Each family consists of 40 quadrupole magnets connected in series. These magnets are energized by two phase-controlled, 12-pulse power supplies. Therefore, each power supply will be rated to deliver the necessary power to only 40 quadrupole magnets. The two families of sextupole magnets in the injector synchrotron each consists of 32 sextupole magnets connected in series, powered by a phase-controlled power supply. Thus, each power supply shall be capable of delivering power to only 32 sextupole magnets

  17. International experiences with power supply crises

    International Nuclear Information System (INIS)

    Many so-called deregulated power markets experience a hardened energy and power balance and some have had supply crises. This report discusses the crises, their impacts and their causes as well as the measures taken by the authorities to solve the crises. It also considers the similarities or dissimilarities with respect to the situation in Norway the winter 2002/2003. Like Norway, many of the countries have a considerable share of hydroelectric power. It is found, however, that the dependence on water of its own is not the reason for the crises, but that the inflow conditions give the market greater challenges. Furthermore, the Norwegian market has greater flexibility in the consumption, greater import capacity, better price security possibilities and less problems with market power than most of the countries here considered. Various factors influence a country's power consumption and production capacity. Economic growth and the availability of inexpensive power contribute to accelerate the consumption, while predictable external conditions and sufficient expected investment earnings are necessary to achieve an increase of the capacity - both through new investments and attendance to existing capacity. In a smooth power market there must be a certain correspondence between consumption and installed capacity, and the capacity must be such that it can cover the continuous demand for power and at the same time be flexible enough to deliver power at peak loads. This is a to deliver power at peak loads. This is also true of the transmission capacity. In addition, some extra capacity must be available for unexpected events. The basic problem is, in any power market, that the consumption may rise fast, while the investments in new capacity typically occurs in leaps, with long and costly construction phases. Many countries have lately experienced a hardening of the balance between consumption and capacity and so have been vulnerable to unexpected increases in consumption or resource failure. This was also the case with the Norwegian/Nordic market the winter 2002/2003, when the autumn rain failed to come and the winter came early and was unusually cold. The subject of this report is deregulated power markets outside of the Nordic countries, where the supply security is a serious problem or has been such. The report aims to: (1) Give an account of the course of events, the causes, the impacts and the measures taken to handle the crises, and (2) Analyze similarities and dissimilarities with respect to the situation in Norway. Information about the causes of supply crises and their impacts in other countries may help to create a better basis for the Norwegian authorities to make decisions about measures to secure a robust power market in Norway.

  18. The Fermilab D0 overpass power supply system

    International Nuclear Information System (INIS)

    The overpass power supply system consists of two power supplies. A 1 kV, 3600A SCR supply drives eight Main Ring type magnets and must track twice the Main Ring current to within + or -0.1%. The second supply drives trim coils wound inside four of the main magnets. This dual-converter SCR supply, a modified Fermilab H.O.P.S. unit, supplies + or -50A at + or -30V and it must generate + or -200V swings to buck-out the voltage inductively coupled from the main supply. Both power supply regulators use dead reckoned voltage drive programs to extend their effective bandwidths

  19. Obtaining of bilateral high voltage epitaxial p—i—n Si structures by LPE method

    Directory of Open Access Journals (Sweden)

    Vakiv N. M.

    2013-12-01

    Full Text Available Silicon p—i—n-structures are usually obtained using conventional diffusion method or liquid phase epitaxy (LPE. In both cases, the formation of p- and n-layers occurs in two stages. This technological approach is quite complex. Moreover, when forming bilateral high-voltage epitaxial layers, their parameters significantly deteriorate as a result of prolonged heat treatment of active high-resistivity layer. Besides, when using diffusion method, it is impossible to provide good reproducibility of the process. In this paper a technique of growing bilateral high-voltage silicon p—i—n-structures by LPE in a single process is proposed. The authors have obtained the optimum compounds of silicon-undersaturated molten solutions for highly doped (5•1018 cm–3 contact layers: 0.4—0.8 at. % aluminum in gallium melt for growing p-Si-layers and 0.03—0.15 at. % ytterbium in tin melt for n-Si-layers. Parameters of such structures provide for manufacturing of high-voltage diodes on their basis. Such diodes can be used in navigational equipment, communication systems for household and special purposes, on-board power supply systems, radar systems, medical equipment, etc.

  20. Power Supplies for High Energy Particle Accelerators

    Science.gov (United States)

    Dey, Pranab Kumar

    2015-05-01

    The on-going research and the development projects with Large Hadron Collider at CERN, Geneva, Switzerland has generated enormous enthusiasm and interest amongst all to know about the ultimate findings on `God's Particle'. This paper has made an attempt to unfold the power supply requirements and the methodology adopted to provide the stringent demand of such high energy particle accelerators during the initial stages of the search for the ultimate particles. An attempt has also been made to highlight the present status on the requirement of power supplies in some high energy accelerators with a view that, precautionary measures can be drawn during design and development from earlier experience which will be of help for the proposed third generation synchrotron to be installed in India at a huge cost.

  1. Cost unit accounting for power supply companies

    International Nuclear Information System (INIS)

    Cost unit accounting was introduced to the power supply company Energie-Versorgung Schwaben AG (EVS) in the Seventies. The initial method of peak load proportioning was later modified to the so-called VDEW method and further improved in consecutive steps through specific measurements. Here EVS focussed particularly on collecting data in the separate-contract sector. The authors describe the procedure adopted and results obtained. (orig.)

  2. The SPS auxiliary magnet power supplies

    International Nuclear Information System (INIS)

    A functional description is given of these thyristor power supplies - many of which are of the bipolar type without circulating current - with emphasis on the CERN-developed regulation circuits. A detailed analysis is given of a new thyristor gate control with low subharmonic content and fast response over a wide rectifier output range. A current regulation time constant of 14 msec is maintained even at near-zero output, where the thyristors conduct only during a small fraction of each cycle. (Auth.)

  3. Power supply for carbon dioxide lasers

    Science.gov (United States)

    Schiffner, G. (inventor)

    1973-01-01

    An improved ac power supply for a CO2 laser which eliminates the need for ballast resistors to excite a stable discharge is disclosed. The method involves the connection of an inductance in front of the rectifier. This procedure provides a nondissapative positive resistance effect for cancelling the negative differential resistance exhibited by the tube at frequencies below 2 KHz. Such an inductance setup also increases the efficiency of the system.

  4. Pulse electric power compensation for accelerator power supply

    International Nuclear Information System (INIS)

    Some synchrotron accelerators are excited by pulse operation. Especially, power supply for the large-scale accelerator magnets, such as J-PARC, draws a large amount of power from the utility network. Such large pulse power will give un-allowed disturbances to the connected ac power system. Energy storage system, such as a SMES system, will be required for compensating the pulse electric power and reducing the disturbances. A SMES system is also expected to protect the instantaneous voltage drop and the load levelling so far. Load levelling is essential to reduce the running cost of medical use accelerators. Present status of R and D for SMES and other energy storage systems is presented. An application example for an accelerator power supply is also discussed. (author)

  5. NSLS-II booster power supplies control

    International Nuclear Information System (INIS)

    A special set of devices was developed at BNL for the NSLS-II magnetic system Power Supplies (PSs) control: Power Supply Controller (PSC) and Power Supply Interface (PSI). PSI is placed close to current regulators and is connected to the PSC via fiber-optic 50 Mbps data link. PSC communicates with EPICS IOC (Input/Output Controller) through a 100 Mbps Ethernet port. The main function of IOC includes ramp curve upload, ADC waveforms data download, and various process variables control. The 256 Mb DDR2 memory on PSC provides storage for up to 16 ramping tables for both DAC channels, and a 20-second waveform record for all ADC channels. The 100 Mbps Ethernet port enables real time display for 4 ADC waveforms. The NSLS-II booster PSs are divided into two groups: ramping PSs, which provide passage of the beam during the beam ramp in the booster from 200 MeV up to 3 GeV in 300 ms time interval, and pulsed PSs, which provide beam injection from the linac and extraction to the Storage Ring. This paper describes a project of the NSLS-II booster PSs control. Characteristic features for the ramping magnets control and pulsed magnets control in a double-injection mode of operation are considered in the paper. (authors)

  6. High voltage switch triggered by a laser-photocathode subsystem

    Science.gov (United States)

    Chen, Ping; Lundquist, Martin L.; Yu, David U. L.

    2013-01-08

    A spark gap switch for controlling the output of a high voltage pulse from a high voltage source, for example, a capacitor bank or a pulse forming network, to an external load such as a high gradient electron gun, laser, pulsed power accelerator or wide band radar. The combination of a UV laser and a high vacuum quartz cell, in which a photocathode and an anode are installed, is utilized as triggering devices to switch the spark gap from a non-conducting state to a conducting state with low delay and low jitter.

  7. Power Supply Systems for Rapid Cycling Synchrotron

    Science.gov (United States)

    Watanabe, Yasuhiro; Adachi, Toshikazu; Someya, Hirohiko; Koseki, Shoichiro; Ogawa, Shinichi

    JAEA and KEK are jointly constructing a high intensity proton accelerator project J-PARC. Its main accelerator is 3GeV rapid cycling synchrotron (RCS). Two types of resonant excitation systems, parallel and cascade, are introduced to excite DC biased 25Hz AC currents through its main magnets. The parallel excitation is adopted for dipole magnets power supply system, and the cascade excitations are adopted for seven family quadrupole magnets systems. In this paper, two systems are investigated and analyzed, and it is explained why different types are adopted to each system. Authors believe that such hybrid exciting systems are most suitable for high power RCS.

  8. Advances in high voltage insulation and arc interruption in SF6 and vacuum

    CERN Document Server

    Maller, V N

    1982-01-01

    Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum deals with high voltage breakdown and arc extinction in sulfur hexafluoride (SF6) and high vacuum, with special emphasis on the application of these insulating media in high voltage power apparatus and devices. The design and developmental aspects of various high voltage power apparatus using SF6 and high vacuum are highlighted. This book is comprised of eight chapters and opens with a discussion on electrical discharges in SF6 and high vacuum, along with the properties and handling of SF6 gas. The following chapters fo

  9. A coding and high voltage driving module

    International Nuclear Information System (INIS)

    A coding and high-voltage pulse driving module used in free-space quantum communication is described. This module generate random control signal to drive High-Voltage Pulse generator to control receiver’s polarization, receive detector signal and encode them by signal channel. (authors)

  10. Testing a High Tc superconducting high voltage generator

    International Nuclear Information System (INIS)

    Full text: Based on a R, L, C resonant circuit and using a high Tc superconducting (HTS) inductor, very high voltages and currents can be produced. Theoretically, an infinite high voltage can be achieved by continually reversing a dc power source in such a resonant circuit. An electronic switch has been built with a thyristor-bridge to enable the necessary switching to be carried out. A (Bi,Pb)2Sr2Ca2Cu3010+x HTS wire has been used to make the superconducting inductor. The generator is a high voltage source suitable for a high impedance load, and therefore can be used for partial discharge testing and insulation resistance testing. It could also be used as a testing method for the HTS itself with respect to the critical current and AC loss measurements

  11. Risk allocation in independent power supply contracts

    International Nuclear Information System (INIS)

    Congress has made significant progress in recent months toward amending the Public Utility Holding Company Act of 1935 (PUHCA). The purposes of such amendment are to broaden power supply options for electric utilities and expand competition in whole-sale power generation markets. PUHCA reform is an integral part of President Bush's National Energy Strategy and has been included in legislation pending in both Houses of Congress. Congress will, hopefully, approve energy legislation that includes PUHCA reform before it adjourns this year. PUHCA reform has, however, stimulated heated debate within the power industry itself as well as among various consumer interest groups. One important issue in the public debate concerns risk allocation. If PUHCA is reformed, will risk be allocated efficiently and equitably between independent power producers and electric utility buyers? This article addresses that important question

  12. Distance to High-Voltage Power Lines and Risk of Childhood Leukemia - an Analysis of Confounding by and Interaction with Other Potential Risk Factors

    DEFF Research Database (Denmark)

    Pedersen, Camilla; Bräuner, Elvira V

    2014-01-01

    We investigated whether there is an interaction between distance from residence at birth to nearest power line and domestic radon and traffic-related air pollution, respectively, in relation to childhood leukemia risk. Further, we investigated whether adjusting for potential confounders alters the association between distance to nearest power line and childhood leukemia. We included 1024 cases aged <15, diagnosed with leukemia during 1968-1991, from the Danish Cancer Registry and 2048 controls randomly selected from the Danish childhood population and individually matched by gender and year of birth. We used geographical information systems to determine the distance between residence at birth and the nearest 132-400 kV overhead power line. Concentrations of domestic radon and traffic-related air pollution (NOx at the front door) were estimated using validated models. We found a statistically significant interaction between distance to nearest power line and domestic radon regarding risk of childhood leukemia (p?=?0.01) when using the median radon level as cut-off point but not when using the 75th percentile (p?=?0.90). We found no evidence of an interaction between distance to nearest power line and traffic-related air pollution (p?=?0.73). We found almost no change in the estimated association between distance to power line and risk of childhood leukemia when adjusting for socioeconomic status of the municipality, urbanization, maternal age, birth order, domestic radon and traffic-related air pollution. The statistically significant interaction between distance to nearest power line and domestic radon was based on few exposed cases and controls and sensitive to the choice of exposure categorization and might, therefore, be due to chance.

  13. Distance to High-Voltage Power Lines and Risk of Childhood Leukemia – an Analysis of Confounding by and Interaction with Other Potential Risk Factors

    DEFF Research Database (Denmark)

    Pedersen, Camilla; Bräuner, Elvira V

    2014-01-01

    We investigated whether there is an interaction between distance from residence at birth to nearest power line and domestic radon and traffic-related air pollution, respectively, in relation to childhood leukemia risk. Further, we investigated whether adjusting for potential confounders alters the association between distance to nearest power line and childhood leukemia. We included 1024 cases aged <15, diagnosed with leukemia during 1968-1991, from the Danish Cancer Registry and 2048 controls randomly selected from the Danish childhood population and individually matched by gender and year of birth. We used geographical information systems to determine the distance between residence at birth and the nearest 132-400 kV overhead power line. Concentrations of domestic radon and traffic-related air pollution (NOx at the front door) were estimated using validated models. We found a statistically significant interaction between distance to nearest power line and domestic radon regarding risk of childhood leukemia (p?=?0.01) when using the median radon level as cut-off point but not when using the 75th percentile (p?=?0.90). We found no evidence of an interaction between distance to nearest power line and traffic-related air pollution (p?=?0.73). We found almost no change in the estimated association between distance to power line and risk of childhood leukemia when adjusting for socioeconomic status of the municipality, urbanization, maternal age, birth order, domestic radon and traffic-related air pollution. The statistically significant interaction between distance to nearest power line and domestic radon was based on few exposed cases and controls and sensitive to the choice of exposure categorization and might, therefore, be due to chance.

  14. Distance to high-voltage power lines and risk of childhood leukemia : An analysis of confounding by and interaction with other potential risk factors

    DEFF Research Database (Denmark)

    Pedersen, Camilla; Bräuner, Elvira

    2014-01-01

    We investigated whether there is an interaction between distance from residence at birth to nearest power line and domestic radon and traffic-related air pollution, respectively, in relation to childhood leukemia risk. Further, we investigated whether adjusting for potential confounders alters the association between distance to nearest power line and childhood leukemia. We included 1024 cases aged <15, diagnosed with leukemia during 1968-1991, from the Danish Cancer Registry and 2048 controls randomly selected from the Danish childhood population and individually matched by gender and year of birth. We used geographical information systems to determine the distance between residence at birth and the nearest 132-400 kV overhead power line. Concentrations of domestic radon and traffic-related air pollution (NOx at the front door) were estimated using validated models. We found a statistically significant interaction between distance to nearest power line and domestic radon regarding risk of childhood leukemia (p = 0.01) when using the median radon level as cut-off point but not when using the 75th percentile (p = 0.90). We found no evidence of an interaction between distance to nearest power line and traffic-related air pollution (p = 0.73). We found almost no change in the estimated association between distance to power line and risk of childhood leukemia when adjusting for socioeconomic status of the municipality, urbanization, maternal age, birth order, domestic radon and traffic-related air pollution. The statistically significant interaction between distance to nearest power line and domestic radon was based on few exposed cases and controls and sensitive to the choice of exposure categorization and might, therefore, be due to chance

  15. Neutron-induced single event burnout in high voltage electronics

    International Nuclear Information System (INIS)

    Energetic neutrons with an atmospheric neutron spectrum, which were demonstrated to induce single event burnout in power MOSFETs, have been shown to induce burnout in high voltage (>3,000V) electronics when operated at voltages as low as 50% of rated voltage. The laboratory failure rates correlate well with field failure rates measured in Europe

  16. Very low power, high voltage base for a Photo Multiplier Tube for the KM3NeT deep sea neutrino telescope

    CERN Document Server

    Timmer, P; Peek, H; 10.1088/1748-0221/5/12/C12049

    2010-01-01

    The described system is developed in the framework of a deep-sea submerged Very Large Volume neutrino Telescope where photons are detected by a large number of Photo Multiplier Tubes. These PMTs are placed in optical modules (OM). A basic Cockcroft-Walton (CW) voltage multiplier circuit design is used to generate multiple voltages to drive the dynodes of the photomultiplier tube. To achieve a long lifetime and a high reliability the dissipation in the OM must be kept to the minimum. The design is also constrained by size restrictions, load current, voltage range, and the maximum allowable ripple in the output voltage. A surface mount PMT-base PCB prototype is designed and successfully tested. The system draws less than 1.5 mA of supply current at a voltage of 3.3 V with outputs up to -1400 Vdc cathode voltage, a factor 10 less than the commercially available state of the art

  17. 77 FR 39745 - Fuel Oil Systems for Emergency Power Supplies

    Science.gov (United States)

    2012-07-05

    ...REGULATORY COMMISSION [NRC-2012-0159] Fuel Oil Systems for Emergency Power Supplies...regulatory guide (DG), DG-1282, ``Fuel Oil Systems for Emergency Power Supplies...Commission's requirements regarding fuel oil systems for safety-related...

  18. Innovative Digitally Controlled Particle Accelerator Magnet Power Supply

    DEFF Research Database (Denmark)

    Nielsen, Rasmus Ørndrup; Bidoggia, Benoit

    2013-01-01

    Particle accelerator magnet power supplies needs to be extremely precise. A new and innovative power supply for particle accelerator magnets is proposed. The topologies for the input and the output converter are shown and the control architecture is described.

  19. 77 FR 48177 - Fuel Oil Systems for Emergency Power Supplies

    Science.gov (United States)

    2012-08-13

    ...NRC-2012-0159] Fuel Oil Systems for Emergency Power Supplies AGENCY: Nuclear Regulatory Commission. ACTION: Draft...Guide, DG- 1282, ``Fuel Oil Systems for Emergency Power Supplies,'' in the Federal Register for a 60 day public...

  20. Research on the technology of the power supply for NBI suppressed grid

    International Nuclear Information System (INIS)

    The power supply of Neutral Beam Injector (NBI) Suppressed grid is an integral part of the NBI power system. Its output voltage can be changed in the range of 1 to 5 kV with pulsed load based on the experimental desire, the rise time and the fall time of pulse are not more than 20 ?s. The project presented in the paper implement the high-voltage DC platform by the technology of phase-shifted PWM and series resonant converter, and then the vacuum tetrode is applied to modulate. The main circuit topology and control method are analyzed. The preliminary experimental results show its eminent dynamic performance, and the capacity for anti-overload and short circuit proof have been enhanced, it can be operated under pulsed load conditions and with better practical prospect in NBI experiment. (authors)

  1. Coordination of the high voltage network and medium voltage network with distributed reserve

    International Nuclear Information System (INIS)

    The load density increase in the central part of Skopje rise the question of planning high voltage power network in that area. The network should be underground. In order to reduce the total investment in high voltage cables and substations it has been suggested a concept with 'distributed reserve' and coordination of both high voltage network and medium voltage network. Such an example for the central part of Skopje has been described in this paper.(Original)

  2. Correction magnet power supplies for APS machine

    International Nuclear Information System (INIS)

    A number of correction magnets are required for the advanced photon source (APS) machine to correct the beam. There are five kinds of correction magnets for the storage ring, two for the injector synchrotron, and two for the positron accumulator ring (PAR). Table I shoes a summary of the correction magnet power supplies for the APS machine. For the storage ring, the displacement of the quadrupole magnets due to the low frequency vibration below 25 Hz has the most significant effect on the stability of the positron closed orbit. The primary external source of the low frequency vibration is the ground motion of approximately 20 ?m amplitude, with frequency components concentrated below 10 Hz. These low frequency vibrations can be corrected by using the correction magnets, whose field strengths are controlled individually through the feedback loop comprising the beam position monitoring system. The correction field require could be either positive or negative. Thus for all the correction magnets, bipolar power supplies (BPSs) are required to produce both polarities of correction fields. Three different types of BPS are used for all the correction magnets. Type I BPSs cover all the correction magnets for the storage ring, except for the trim dipoles. The maximum output current of the Type I BPS is 140 Adc. A Type II BPS powers a trim dipole, and its maximum output current is 60 Adc. The injector synchrotron and PAR correction magnets are powered form Type III BPSs, whose maximum output current is 25 Adc

  3. Power supply control and monitor of the BESIII superconducting magnet

    International Nuclear Information System (INIS)

    This paper introduces the control and monitor systems for the Power Supply of the BESIII superconducting magnet. Details of the Power Supply monitor logic are described, which can monitor the temperature of transformer, reactor, IGBT, diode, cooling water of DCCT and the rotate speed of fan inside the Power Supply. These data were transferred to PC through CANbus and displayed at real time. (authors)

  4. Preferred external power supplies; Fuentes electricas preferentes exteriores

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Anton, L.

    2010-07-01

    In June 2008 ANAV and ENDESA DISTRIBUCION (EDE) undertook a joint study of Asco NPP Preferred External Power Supplies (PEPSs) to check the number of lines or power supplies to the 110 kV substation at Asco that met the criteria defined in the power supply regulations applicable to Asco NPP and primarily to confirm compliance with IEEE 765-2006 standard. (Author).

  5. 47 CFR 80.963 - Main power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Main power supply. 80.963 Section 80.963 Telecommunication...Vessels on the Great Lakes § 80.963 Main power supply. (a) A main power supply must be available at all times while the...

  6. 47 CFR 80.917 - Reserve power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 false Reserve power supply. 80.917 Section 80.917...Passenger Boats § 80.917 Reserve power supply. (a) The requirements of this...1, 1957, must have a reserve power supply located on the same deck as...

  7. 14 CFR 25.1331 - Instruments using a power supply.

    Science.gov (United States)

    2010-01-01

    ...2010-01-01 false Instruments using a power supply. 25.1331 Section 25.1331...25.1331 Instruments using a power supply. (a) For each instrument required...by § 25.1303(b) that uses a power supply, the following apply:...

  8. 47 CFR 80.859 - Main power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Main power supply. 80.859 Section 80.859 Telecommunication...Not Subject to Subpart W § 80.859 Main power supply. (a) The main power supply must simultaneously energize the...

  9. 47 CFR 80.860 - Reserve power supply.

    Science.gov (United States)

    2010-10-01

    ...2010-10-01 2010-10-01 false Reserve power supply. 80.860 Section 80.860 Telecommunication...Subject to Subpart W § 80.860 Reserve power supply. (a) When the main power supply is not on the same deck as the main...

  10. Ultracapacitor-Based Uninterrupted Power Supply System

    Science.gov (United States)

    Eichenberg, Dennis J.

    2011-01-01

    The ultracapacitor-based uninterrupted power supply (UPS) system enhances system reliability; reduces life-of-system, maintenance, and downtime costs; and greatly reduces environmental impact when compared to conventional UPS energy storage systems. This design provides power when required and absorbs power when required to smooth the system load and also has excellent low-temperature performance. The UPS used during hardware tests at Glenn is an efficient, compact, maintenance-free, rack-mount, pure sine-wave inverter unit. The UPS provides a continuous output power up to 1,700 W with a surge rating of 1,870 W for up to one minute at a nominal output voltage of 115 VAC. The ultracapacitor energy storage system tested in conjunction with the UPS is rated at 5.8 F. This is a bank of ten symmetric ultracapacitor modules. Each module is actively balanced using a linear voltage balancing technique in which the cell-to-cell leakage is dependent upon the imbalance of the individual cells. The ultracapacitors are charged by a DC power supply, which can provide up to 300 VDC at 4 A. A constant-voltage, constant-current power supply was selected for this application. The long life of ultracapacitors greatly enhances system reliability, which is significant in critical applications such as medical power systems and space power systems. The energy storage system can usually last longer than the application, given its 20-year life span. This means that the ultracapacitors will probably never need to be replaced and disposed of, whereas batteries require frequent replacement and disposal. The charge-discharge efficiency of rechargeable batteries is approximately 50 percent, and after some hundreds of charges and discharges, they must be replaced. The charge-discharge efficiency of ultracapacitors exceeds 90 percent, and can accept more than a million charges and discharges. Thus, there is a significant energy savings through the efficiency improvement, and there is far less downtime for applications and labor involved in replacing an ultracapacitor versus batteries. Also, the lengthy lifespan of this design would greatly reduce the disposal problems posed by lead acid, nickel cadmium, lithium, and nickel metal hydride batteries. This innovation is recyclable by nature, which further reduces system costs. The disposal of ultracapacitors is simple, as they are constructed of non-hazardous components. They are also safer than batteries in that they can be easily discharged, and left indefinitely in a safe, discharged state where batteries cannot.

  11. Evolution of Very High Frequency Power Supplies

    DEFF Research Database (Denmark)

    Knott, Arnold; Andersen, Toke Meyer

    2013-01-01

    The ongoing demand for smaller and lighter power supplies is driving the motivation to increase the switching frequencies of power converters. Drastic increases however come along with new challenges, namely the increase of switching losses in all components. The application of power circuits used in radio frequency transmission equipment helps to overcome those. However those circuits were not designed to meet the same requirements as power converters. This paper summarizes the contributions in recent years in application of very high frequency (VHF) technologies in power electronics, shows results of the recent advances and describes the remaining challenges. The presented results include a self-oscillating gate-drive, air core inductor optimizations, an offline LED driver with a power density of 8.9 W/cm3 and a 120 MHz, 9 W DC powered LED driver with 89 % efficiency as well as a bidirectional VHF converter. The challenges to be solved before VHF converters can be used effectively in industrial products are within those three categories: components, circuit architectures and reliability testing.

  12. Power supplies for heavy ion source test stand

    International Nuclear Information System (INIS)

    Variable Energy Cyclotron at Calcutta uses a low power PIG-type of ion source at present for lighter ions like ?-particles, protons and deuterons. For accelerating heavier ions a new high power Penning ion gauge (PIG) type source, which will generate high charge state heavy ions, is needed. A programme has been taken up at VECC to develop this heavy ion source and a test stand (HISTS) for the purposes. The test stand which has to simulate the conditions of the cyclotron requires a number of regulated power supplies viz. arc power supply (continuous mode 0-10 KV/10 amp and pulse mode 10 KV/40 amp), current regulated magnet power supply (300 amp/150 V), voltage regulated puller supply (0-10 KV/50 mA), voltage regulated bias power supply (0-20 KV/100 mA), current regulated bombarder supply (0-1 KV/1 amp) and unregulated filament A.C. supply (300 amp/15 V). Among these power supplies, arc, bombarder and filament supplies are floated at 20 KV DC. Out of the above six power supplies, puller, bias and bombarder power supplies are already fabricated, tested and commissioned. Magnet power supply is being commissioned shortly. Fabrication and installation of the arc supply is in progress. (author). 6 figs

  13. LDEF (Prelaunch), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10

    Science.gov (United States)

    1984-01-01

    LDEF (Prelaunch), AO054 : Space Plasma High-Voltage Drainage Experiment, Tray D10 The prelaunch photograph of The Space Plasma High Voltage Drainage Experiment (SP HVD) was taken in SAEF II at KSC prior to installation on the LDEF. The SP HVD experiment consist of two identical sets of experiment hardware mounted in three (3) inch deep LDEF experiment trays, one tray is located in the LDEF position B04 adjacent to the LDEF trailing edge and the other is located at LDEF position D10 adjacent to the LDEF leading edge. Each set of SP HVD experiment hardware, self-contained within the experiment tray, consist of six (6) fiberglass reinforced epoxy modules carrying charged dielectric samples on top and the power supplies and electronics below. Four (4) dielectric samples, Kapton with Vapor Deposited Aluminum on one side (VDA-Kapton), are bonded to each of the fiberglass modules with a silver filled conductive epoxy adhesive. The spaces between the dielectric sample covered modules and between the modules and the tray flanges are covered by strips of VDA-Kapton attached with acrylic transfer adhesive and Kapton tape. Each experiment tray also contain two solar cell modules. Power for the experiment is provided by LiSO2 batteries supplied by the LDEF Project. The experiment was assembled using non-magnetic stainless steel fasteners. Reflections of the surrounding area can be seen in the VDA-Kapton dielectric samples.

  14. New Simulation Method of New HV Power Supply for Industrial Microwave Generators with N=2 Magnetrons

    Directory of Open Access Journals (Sweden)

    N. El Ghazal

    2013-01-01

    Full Text Available This original work treats a new simulation method of a new type of high voltage power supply for microwave generators with N magnetrons (treated case: N=2 magnetrons, used as a source of energy in the industrial applications. This new power supply is composed of a single-phase HV transformer with magnetic leakage flow, supplying two parallel cells, which multiplies the voltage and stabilizes the current. The doubler supplies one magnetron. The transformer is presented by its p equivalent circuit. Each inductance of the model is characterized by its relation "flow-current". In this paper, we present a new approach validation of the p model of the special transformer using Matlab-Simulink code. The theoretical results compared with the experimental measurements, is in good agreement with them. The use of this tool Matlab-Simulink, has allowed us to confirm the possibility of the operation of this new system without interaction between magnetrons, with a view to a possible optimization which lead to reduce the weight, the volume and the cost of implementation while ensuring the process of regulating the current in each magnetron.

  15. Young people's view of power generation and power supply

    International Nuclear Information System (INIS)

    Asked about what they think are the most urgent political problems, the young people ranked unemployment and environmental pollution higher (80 pic) than the problems of energy generation and supply, which are in the third place together with peaceful policy and terrorism (55% priority for each). Young people's problem awareness in the energy sector rather concentrates on nuclear power generation and its hazards than on aspects of future energy supplies. In fact, currently only 38% of the young people expect any electricity supply shortages in the FRG, as compared to 47% in 1982. But as in 1982, seven per cent of the young people today assume that power consumption in the FRG will continue to rise. (orig.)

  16. Measurement ot the switching over-voltages at the disconnection of the high voltage shunt reactors in the Romanian power system

    Energy Technology Data Exchange (ETDEWEB)

    Stroica, Paul Constantin; Merfu, Ion; Stroica, Mihail; Merfu, Marius; Cojocaru, Florian; Stefan, Dinu; Cojocaru, Mihai

    2010-09-15

    The paper presents the measurements of the switching over-voltages made in the Romanian Power System, at the 400/220/110 kV Urechesti substation at the disconnection of a 400 kV, 100 MVAr shunt reactor type DFAL, Siemens, Germany, in 3 consecutive versions. The first one is for shunt reactor controlled by live-tank oil circuit breaker, the second one is for shunt reactor controlled by SF6 circuit breaker, and the third one is for shunt reactor controlled by SF6 circuit breaker and synchronize device.

  17. Simple power supply for power load controlled isoelectric focusing.

    Czech Academy of Sciences Publication Activity Database

    Duša, Filip; Šlais, Karel

    2014-01-01

    Ro?. 35, ?. 8 (2014), s. 1114-1117. ISSN 0173-0835 R&D Projects: GA MV VG20102015023 Institutional support: RVO:68081715 Keywords : isoelectric focusing * power supply * voltage multiplier Subject RIV: CB - Analytical Chemistry, Separation Impact factor: 3.161, year: 2013 http://hdl.handle.net/11104/0231022

  18. Improving Electrical Efficiency of Edm Power Supply

    Science.gov (United States)

    Toma, Emanoil; Simion, Carmen Mihaela

    2014-11-01

    This paper briefly presents the principal types of Pulse Generators for Electrical Discharge Machining and ways to improve electrical efficiency. A resonant converter with series-parallel LCC circuit, for EDM applications, was analyzed by PSpice simulation. The performances of EDM Power Supply were improved by adding an energy recovering - voltage limiter circuit. The shape of current pulse was changed by adding a supplementary MOSFET Switch in parallel with the gap. Two or more converters can be parallelized, in this way output current can be changed. A bloc-schema was conceived for EDM experimental set up

  19. Universal power supply for repair operation at TPP and NPP

    International Nuclear Information System (INIS)

    Universal power supply for repair operations at TPP and NPP is described. Serial transformer represents a basic element of the power supply. The power supply ensures a great amount of operation voltage stages from 4.6 V up to 61 V at load current up to 1600 A. The portable power supply may be used for turbine stud heating, steam line induction heating and welding operations. The main power supply advantage over previous devices consists in considerable decrease of required current and in increase of its reliability

  20. Universal power supply for repair operation at TPP and NPP

    Energy Technology Data Exchange (ETDEWEB)

    Kulikov, V.N.

    1985-03-01

    Universal power supply for repair operations at TPP and NPP is described. Serial transformer represents a basic element of the power supply. The power supply ensures a great amount of operation voltage stages from 4.6 V up to 61 V at load current up to 1600 A. The portable power supply may be used for turbine stud heating, steam line induction heating and welding operations. The main power supply advantage over previous devices consists in considerable decrease of required current and in increase of its reliability.

  1. DC power supplies power management and surge protection for power electronic systems

    CERN Document Server

    Kularatna, Nihal

    2011-01-01

    Modern electronic systems, particularly portable consumer electronic systems and processor based systems, are power hungry, compact, and feature packed. This book presents the most essential summaries of the theory behind DC-DC converter topologies of both linear and switching types. The text discusses power supply characteristics and design specifications based on new developments in power management techniques and modern semiconductors entering into the portable electronics market. The author also addresses off-the-line power supplies, digital control of power supply, power supply protection

  2. High voltage and electrical insulation engineering

    CERN Document Server

    Arora, Ravindra

    2011-01-01

    "The book is written for students as well as for teachers and researchers in the field of High Voltage and Insulation Engineering. It is based on the advance level courses conducted at TU Dresden, Germany and Indian Institute of Technology Kanpur, India. The book has a novel approach describing the fundamental concept of field dependent behavior of dielectrics subjected to high voltage. There is no other book in the field of high voltage engineering following this new approach in describing the behavior of dielectrics. The contents begin with the description of fundamental terminology in the subject of high voltage engineering. It is followed by the classification of electric fields and the techniques of field estimation. Performance of gaseous, liquid and solid dielectrics under different field conditions is described in the subsequent chapters. Separate chapters on vacuum as insulation and the lightning phenomenon are included"--

  3. Power supply and ethics; Energieversorgung und Ethik

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2004-01-01

    The 'Power Supply and Ethics' workshop was designed on the basis of a recommendation by the Nuclear Technology Committee (FA-KT) of VDI-GET. The topic is part of a series of events and publications by VDI in an area where engineering and the humanities converge. The Workshop comprised presentations and thorough discussions of seven papers on 'Power Supply and Ethics', reflecting a variety of contents and points of view of the different disciplines participating. The Workshop offered another opportunity to take the initiative and influence the public, especially politics. Other activities are planned which also the participants increasingly consider an obligation to the public. (orig.) [German] Der Workshop 'Energieversorgung und Ethik' wurde aufgrund einer Empfehlung des Fachausschusses Kerntechnik (FA-KT) der VDI-GET konzipiert. Die angesprochene Thematik fuegt sich dabei in eine Reihe von Veranstaltungen und Publikationen des VDI im Ueberschneidungsbereich von Ingenieur- und Geisteswissenschaften ein. Der Workshop umfasste die Praesentation und intensive Diskussion von sieben Vortraegen zum Themenkomplex 'Energieversorgung und Ethik', wobei sowohl verschiedenste inhaltliche Schwerpunkte als auch Sichtweisen der unterschiedlichen beteiligten Fakultaeten beruecksichtigt wurden. Der Workshop bot eine weitere Chance, initiativ und verstaerkt in die Oeffentlichkeit, insbesondere in die Politik, hineinzuwirken. Weitere Aktivitaeten sind geplant, die auch von den Beteiligten in wachsendem Masse als Verpflichtung gegenueber der Oeffentlichkeit empfunden werden. (orig.)

  4. Supply ships powered by liquid natural gas

    International Nuclear Information System (INIS)

    The Norwegian Government has signed an agreement with three Norwegian companies to build two new supply ships that will use cooled liquid natural gas as a fuel (LNG). The new ships will supply the offshore installations in the North Sea. The greatest advantage for the environment is the fact that the emission of nitrogen oxides is reduced by 85 per cent compared to conventional diesel power. The emission of carbon dioxide is reduced by 20 to 30 per cent. For Norway to be able to fulfil its international environmental commitments the authorities must make it possible for all coastal traffic to use natural gas for fuel in the future. The cost of reducing the NOx emissions directly by using the new gas-powered ships is several times smaller than the cost of obtaining the same reduction on the land bases. If all the Norwegian coastal traffic converted from diesel to natural gas, this would have fulfilled 70 per cent of the country's commitment according to the Gothenburg Protocol

  5. High performance magnet power supply optimization

    International Nuclear Information System (INIS)

    The power supply system for the joint LBL--SLAC proposed accelerator PEP provides the opportunity to take a fresh look at the current techniques employed for controlling large amounts of dc power and the possibility of using a new one. A basic requirement of +- 100 ppM regulation is placed on the guide field of the bending magnets and quadrupoles placed around the 2200 meter circumference of the accelerator. The optimization questions to be answered by this paper are threefold: Can a firing circuit be designed to reduce the combined effects of the harmonics and line voltage combined effects of the harmonics and line voltage unbalance to less than 100 ppM in the magnet field. Given the ambiguity of the previous statement, is the addition of a transistor bank to a nominal SCR controlled system the way to go or should one opt for an SCR chopper system running at 1 KHz where multiple supplies are fed from one large dc bus and the cost--performance evaluation of the three possible systems

  6. Bi-directional high-side current sense circuit for switch mode power supplies

    DEFF Research Database (Denmark)

    Ekhtiari, Marzieh; Bruun, Erik

    2014-01-01

    In order to control a power supply using piezoelectric transformer, AC current in the transformer ne eds to be measured. Due to the control strategy it is necessary to measure amplitude, phase angle and zero crossing of this c urrent. In some applications there is common ground between pri mary and secondary sides of the transformer which is internally implemented inside the transformer. Therefore, curren t must be measured from the high voltage line in the presence of hig h input switching voltage. This paper proposes a resistive current s ensing circuit based on discrete components useful for input voltage s on the order of 200 V. The bandwidth is at least 200 kHz to allow fundamental frequency detection of piezoelectric transformers in use.

  7. High voltage stability performance of a gamma ray detection device

    International Nuclear Information System (INIS)

    Full-text:An industrial grade digital radiation survey meter device is currently being developed at Malaysian Nuclear Agency. This device used a cylindrical type Geiger Mueller (GM) which acts as a detector. GM detector operates at relatively high direct current voltages depend on the type of GM tube. This thin/thick walled cylindrical type of GM tube operates at 450-650 volts range. Proper value and stability performance of high voltage are important parameters to ensure that this device give a reliable radiation dose measurement. This paper will present an assessment of the stability and performance of the high voltage supply for radiation detector. The assessment is performed using System Identification tools box in MATLAB and mathematical statistics. (author)

  8. Efficiency Optimization by Considering the High Voltage Flyback Transformer Parasitics using an Automatic Winding Layout Technique

    DEFF Research Database (Denmark)

    Thummala, Prasanth; Schneider, Henrik

    2014-01-01

    This paper presents an efficiency optimization approach for a high voltage bidirectional flyback dc-dc converter.The main goal is to optimize the converter for driving a capacitive actuator, which must be charged and discharged from 0 V to2.5 kV dc and vice versa,supplied from a24 Vdc supply.The energy efficiency is optimized using a proposed new automatic winding layout (AWL) technique and a comprehensive loss model.The AWL technique generates a large number of transformer winding layouts.The transformer parasitics such as dc resistance, leakage inductance and self-capacitance are calculated for each winding layout.An optimization technique is formulated to minimize the sum of energy losses during charge and discharge operations.The efficiency and energy loss distribution results from the optimization routine provide a deep insight into the high voltage transformer designand its impact on the total converter efficiency.The proposed efficiency optimization approach is experimentally verified on a25 W (averagecharging power) with100 W (peakpower) flyback dc-dc prototype.

  9. The AGS main magnet power supply upgrade

    International Nuclear Information System (INIS)

    The AGS Main Magnet Power Supply consists of a group of thyristor controlled power converters that operate from full rectify to full invert. In order to minimize ripple during the critical periods of injection and extraction 24 pulse converters are used for these portions of the cycle. The maximum voltage available in this mode is nominally 2,000 volts. The converters that are functional during this portion of the cycle are called the flat-top bank or ''F'' bank modules. During acceleration and invert where voltages of up to 12,000 volts are needed and where the ripple requirements are less stringent, groups of twelve pulse converters are operational. These converters are called the Pulsed bank or ''P'' bank modules. The original controlled rectifier system consisted of 96 large mercury filled excitron tubes divided equally between the P bank and F bank converters. These devices were extremely durable and ran successfully for over twenty years. It was, decided to replace the excitron farm with multiple arrangements of three-phase, full-wave, bridge modules that utilize silicon controlled rectifiers (SCR's or thyristors) as the switching element. In order to match the existing transformer connections and buswork, eight identical modules were required; four for the P bank system and four for the F bank system. In order to reduce noise pickup and provide electrical isolation the high level SCR gate triggers are provided via fiberoptic cable. The status of various parameters such as water flow, auxiliary power supply performance, trigger circuitry failure, over voltage, overcurrent, and loss of phase reference are monitored via a programmable logic controller (PLCs). The PLCs use isolated input and output modules for various voltage levels from TTL to 150 Vdc to 125 Vac. These devices are extremely flexible and have allowed modifications and improvements that have enhanced the performance over any equivalent hard wired system

  10. The BaBar LST Detector High Voltage System: Design And Implementation

    International Nuclear Information System (INIS)

    In 2004, the first two sextants of the new Limited Streamer Tube (LST) detector were installed in the BABAR experiment to replace the ageing Resistive Plate Chambers (RPCs) as active detectors for the BABAR Instrumented Flux Return (IFR) muon system. Each streamer tube of the new detector consists of 8 cells. The cell walls are coated with graphite paint and a 100 (micro)m wire forms the anode. These wires are coupled in pairs inside the tubes resulting in 4 independent two-cell segments per LST. High voltage (HV) is applied to the 4 segments through a custom connector that also provides the decoupling capacitor to pick up the detector signals from the anode wires. The BABAR LST detector is operated at 5.5 kV. The high voltage system for the LST detector was designed and built at The Ohio State University (OSU HVPS). Each of the 25 supplies built for BaBar provides 80 output channels with individual current monitoring and overcurrent protection. For each group of 20 channels the HV can be adjusted between 0 and 6 kV. A 4-fold fan-out is integrated in the power supplies to provide a total of 320 outputs. The power supplies are controlled through built-in CANbus and Ethernet (TCP/IP) interfaces. In this presentation we will discuss the design and novel features of the OSU HVPS system and its integration into the BABAR EPICS detector control framework. Experience with the supplies operation during the LST extensive quality control program and their performance during thel program and their performance during the initial data taking period will be discussed

  11. The commercial development of water repellent coatings for high voltage transmission lines

    Energy Technology Data Exchange (ETDEWEB)

    Hunter, Scott Robert [ORNL

    2013-10-01

    The purpose of the Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC and Southwire Company was to jointly develop a low cost, commercially viable, water-repellant anti-icing coating system for high voltage transmission lines. Icing of power lines and other structures caused by freezing rain events occurs annually in the United States, and leads to severe and prolonged power outages. These outages cause untold economic and personal distress for many American families and businesses. Researchers at the Department of Energy s Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee have previously developed a set of superhydrophobic coatings with remarkable anti-icing properties that could potentially be sprayed or painted onto high-tension power lines and pylons. These coatings drastically reduce ice accumulation on these structures during freezing rain events. The project involved obtaining technical input, supplies and test high voltage cables from Southwire, along with the joint development of anti-icing coating techniques, which would result in a commercial license agreement between Southwire and ORNL, and potentially other companies requiring water repellent anti-icing coatings.

  12. The commercial development of water repellent coatings for high voltage transmission lines

    Energy Technology Data Exchange (ETDEWEB)

    Hunter, S. R. [ORNL; Daniel, A. [Southwire Company

    2013-10-31

    The purpose of the Cooperative Research and Development Agreement (CRADA) between UT-Battelle, LLC and Southwire Company was to jointly develop a low cost, commercially viable, water-repellant anti-icing coating system for high voltage transmission lines. Icing of power lines and other structures caused by freezing rain events occurs annually in the United States, and leads to severe and prolonged power outages. These outages cause untold economic and personal distress for many American families and businesses. Researchers at the Department of Energy?s Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee have previously developed a set of superhydrophobic coatings with remarkable anti-icing properties that could potentially be sprayed or painted onto high-tension power lines and pylons. These coatings drastically reduce ice accumulation on these structures during freezing rain events. The project involved obtaining technical input, supplies and test high voltage cables from Southwire, along with the joint development of anti-icing coating techniques, which would result in a commercial license agreement between Southwire and ORNL, and potentially other companies requiring water repellent anti-icing coatings.

  13. Simulation model for driving dynamics, energy use and power supply

    OpenAIRE

    Figueiredo, Rui Sequeira de

    2015-01-01

    The aim of this thesis is to simulate the interaction between the traction power supply system and the traction vehicles planning. Models and calculation methods for driving dynamics, energy use and traction power supply systems are developed in order to simulate the traction power system. In these models are included functionalities as the efficiency degrees, thermal aspects and auxiliary systems of the traction vehicles. The choice of an adequate power supply syst...

  14. Buying power in UK retail chains :a residual supply approach

    OpenAIRE

    Asche, Frank; Nøstbakken, Linda; Tvetera?s, Sigbjørn

    2006-01-01

    The development of supermarket chains has led to substantial concentration in food supply chains, and has raised concerns not only that these companies can exploit oligopoly power, but also oligopsony power. In this paper, we specify a residual supply schedule to investigate the degree of oligopsony power in retailing. Based on the residual supply elasticity, one can also derive a Lerner-type index to measure the degree of market power. After examining the largest supermarket chains in the Un...

  15. Photovoltaic Power Supply for an Airliner Wireless Sensor Network

    OpenAIRE

    Durand-este?be, Paul; Boitier, Vincent; Bafleur, Marise; Dilhac, Jean-marie; Berhouet, S.

    2014-01-01

    This paper presents an autonomous, battery-free power supply which captures, manages and stores energy using photovoltaic cells and supercapacitors to supply pressure sensors belt on top of an airliner's wing.

  16. The Neutral Injector Auxiliary Power Supply System in JET: Design, manufacture and tests

    International Nuclear Information System (INIS)

    The JET Neutral Injection Auxiliary Power Supplies consist of the Arc Power Supply, Filament Power Supply, Snubber Bias Power Supply, Gradient Grid resistive voltage divider and Supression Grid Power Supply, together with an a.c. 115V power distribution system. The features of each power supply are described and the early experience of operation with the Neutral Injector discussed

  17. 30 CFR 75.804 - Underground high-voltage cables.

    Science.gov (United States)

    2010-07-01

    ...2010-07-01 false Underground high-voltage cables. 75.804 Section 75.804...STANDARDS-UNDERGROUND COAL MINES Underground High-Voltage Distribution § 75.804 Underground high-voltage cables. (a) Underground...

  18. DC switch power supply for vacuum-arc coatings deposition

    International Nuclear Information System (INIS)

    Special DC Switch Power Supply for vacuum-arc deposition was developed and tested in the mode of depositing Al and AlN films. Maximum output power was 6 kW, maximum output current - 120 A, open-circuit voltage - 150 V. The Power Supply allows to adjust and stabilize output current in a wide range. Testing of the Power Supply revealed an advantages over the standard 'Bulat-6' power supply, especially for deposition of non-conductive AlN films.

  19. Power supply devices and systems of relay protection

    CERN Document Server

    Gurevich, Vladimir

    2013-01-01

    Power Supply Devices and Systems of Relay Protection brings relay protection and electrical power engineers a single, concentrated source of information on auxiliary power supply systems and devices. The book also tackles specific problems and solutions of relay protection power supply systems and devices, which are often not dealt with in the literature. The author, an experienced engineer with more than 100 patents, draws on his own experience to offer practical, tested advice to readers. A Guide to Relay Protection Power Supply for Engineers and Technicians The first chapter reviews the ele

  20. Reliability of uninterruptible power supply system

    International Nuclear Information System (INIS)

    In the Fast Breeder Test Reactor at Indira Gandhi Centre for Atomic Research, Kalpakkam UPS system is provided as a class-II power supply for critical loads such as central data processing system computers, sodium pump instrumentation and controls, nuclear instrumentation, hydrogen leak detection system, control room recorders etc. These systems are essentially required in healthy operating state for regular plant operation. The aim of this paper is to give in brief, the details of the UPS system initially installed at FBTR, performance of that system during various stages of plant operation. Details and features of the state of the art UPS system replaced recently and improvement required in the developing UPS systems