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1

High voltage power supply for accelerators  

International Nuclear Information System (INIS)

High voltage power supplies play an important role in any accelerator laboratory. They may be broadly classified into three different categories, viz. electrostatic generator, line frequency type high voltage transformer rectifier system and high frequency type Cockroft-Walton voltage multiplier system. Various sophisticated high voltage power supplies of these types have been developed in VECC. The paper describes these experiences in brief. (author). 6 refs., 7 figs

2

Efficient high-voltage power supply  

International Nuclear Information System (INIS)

The operation principle and electronic circuit of efficient high-voltage source for power supply of ionizing radiation detectors is considered. One of the possible methods of the circuit layout for constant low voltage transformation into high output one having high stability is given. 2 refs.; 3 figs

3

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)

4

Modular high voltage power supply for chemical analysis  

Science.gov (United States)

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.

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

2008-07-15

5

Pulsed high voltage extraction power supply  

International Nuclear Information System (INIS)

paper 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)

6

Intense neutron source: high-voltage power supply specifications  

International Nuclear Information System (INIS)

This report explains the need for and sets forth the electrical, mechanical and safety specifications for a high-voltage power supply to be used with the intense neutron source. It contains sufficient information for a supplier to bid on such a power supply

7

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)

8

Suppressing voltage transients in high voltage power supplies  

International Nuclear Information System (INIS)

A high voltage power supply for an X-ray tubes includes voltage adjusting means, a high voltage transformer, switch means connected to make and interrupt the primary current of the transformer, and over-voltage suppression means to suppress the voltage transient produced when the current is switched on. In order to reduce the power losses in the suppression means, an impedance is connected in the transformer primary circuit on operation of the switch means and is subsequently short-circuited by a switch controlled by a timer after a period which is automatically adjusted to the duration of the transient overvoltage. (U.K.)

9

A New Transformer for High Voltage Charging Power Supply  

Directory of Open Access Journals (Sweden)

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.  

Jianming Liu

2013-09-01

10

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

11

A battery powered high voltage bias supply for Ge detectors  

International Nuclear Information System (INIS)

A high voltage bias supply for Ge detectors has been built using low voltage batteries and a pulsed DC-DC converter. This design offers considerable reduction of size and weight and better operating specifications than supplies now in use based on high voltage batteries. (author)

12

High voltage power supply for electrostatic kickers for CRYRING  

International Nuclear Information System (INIS)

This paper presents power supply concept for electrostatic kicker plates in the CRYRING injection. The power supply produces a voltage pulse with a linearly decreasing tail. The voltage can be decreased from peak value to zero in 60 ?s, the same length as the injected pulse. The peak value is adjustable from a few kV up to 60 kV. The power supply consists of a pulse transformer with a control unit placed on the low voltage side of the transformer. Standard low voltage electronic components are used and as pulse transformer an ignition coil is chosen. Only the kicker plates and a capacitive voltage divider are connected on the high voltage side of the transformer. Measurements have indicated that ramps in the range between 80 V/ ?s and 1000 V/ ?s with peak voltage up to 60 kV can be achieved

13

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

14

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 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

15

E-beam high voltage switching power supply  

Science.gov (United States)

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.

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

1997-01-01

16

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.

17

High Voltage Power Supply Design Guide for Space  

Science.gov (United States)

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.

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

2006-01-01

18

A high voltage power supply for radiation detector  

International Nuclear Information System (INIS)

A power supply has been designed and developed using locally available components for portable nuclear radiation monitoring system. It is a dc to dc converter and the input of this power supply is from a 12 volts battery. The maximum output of this supply is 860 volts dc. (author)

19

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

Science.gov (United States)

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.

Bearden, Douglas B. (Inventor)

2007-01-01

20

Design and Construction of Low Cost High Voltage dc Power Supply for Constant Power Operation  

Science.gov (United States)

Pulsed load applications like laser based systems need high voltage dc power supplies with better regulation characteristics. This paper presents the design, construction and testing of dc power supply with 1 kV output at 300 W power level. The designed converter has half bridge switched mode power supply (SMPS) configuration with 20 kHz switching. The paper covers the design of half bridge inverter, closed loop control, High frequency transformer and other related electronics. The designed power supply incorporates a low cost OPAMP based feedback controller which is designed using small signal modelling of the converter. The designed converter was constructed and found to work satisfactorily as per the specifications.

Kumar, N. S.; Jayasankar, V.

2013-06-01

 
 
 
 
21

A stable high voltage, high frequency power supply for electrochemical etching  

International Nuclear Information System (INIS)

A stable, load independent, high voltage, high frequency power supply for the electrochemical etching of tracks in polycarbonate foils is described. Stability is achieved by a feedback system connected to the output voltage. (orig.)

22

A tester for multi-channel high voltage power supply with load  

International Nuclear Information System (INIS)

The authors will introduce a test system used for multi-channel high voltage power supply, and also briefly introduce circuit construction and circuit design, operation principle and specifications. This instrument is mainly used to test single channel or multi-channel high voltage power supply in laboratory or in open field. Especially, it is very useful for the testing of detector's bias. The maximum high voltage value tested by this instrument is 6 kV. The range of output current of high voltage power supply under test is from 100 ?A to 10 mA. This instrument is portable, and of simple construction, high integration, small dimension. It can be operated with AC/DC power supply

23

A tester for multi-channel high voltage power supply with load  

International Nuclear Information System (INIS)

The authors will introduce a test system used for multi-channel high voltage power supply, and also briefly introduce circuit construction and circuit design, operation principle and specification. This instrument is mainly used to test single channel or multi-channel high voltage power supply in laboratory or in open field. Especially, it is very useful for the testing of detector's biases. The maximum high voltage value can be tested by this instrument is 6 kV. The range of output current of high voltage power supply under-test is from 100 ?A to 10 mA. This instrument is portable, and with simple construction, high integration, small dimension. It can be operated with AC/DC power supply

24

High voltage splitting unit for the power supplies of the vacuum pumps of AmPS  

Science.gov (United States)

A high voltage splitting circuit was developed to supply the small vacuum pumps of the bundle circuit of AmPS (Amsterdam Pulse Stretcher). Each pump needs 7 kV and the current is a measure for the vacuum. Since the price per Watt for small power supplies is high compared with large power supplies, it was decided to feed eight pumps from a single large power supply. The splitting unit contains eight current measuring circuits each with outputs for the local meter, a recorder, and a PLC module. The pump current is measured in the high voltage line.

Vanes, J. T.; Vantrigt, J. H.

1991-04-01

25

Development of high-voltage PWM power supply for electron beam bombarding furnace  

International Nuclear Information System (INIS)

The working principle and operation characteristics of a high-voltage PWM-BUCK DC/DC converter are discussed in this paper, and a practical engineering technical route is proposed to apply the converter to high power accelerating voltage source of electron beam bombarding furnace. Compared with the traditional thyristor phase-shifted high voltage source, the application results show that the suggested power supply has the advantages of lower current harmonic, higher power factor and higher operation efficiency. (authors)

26

A high-voltage switching mode-power supply based on SCM  

International Nuclear Information System (INIS)

With the requirements of the efficiency, volume size and intelligent control of the power supply for the x-ray fluorescence analysis, a high-voltage power supply based on the technique of SUM and PWM has been developed. It was designed by single ended type promoted and PID control algorithm regulator, and controlled by STC89C52 SCM. The high-voltage power supply put out 0-50 kV continuous adjustable voltage by means of the transformer and voltage multiplying rectifier, and ran steadily for long time with the small size and high efficiency. (authors)

27

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

Science.gov (United States)

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.

Vazquez Carazo, Alfredo (Inventor)

2006-01-01

28

High-voltage power supply of ND6 portable dose rate meter  

International Nuclear Information System (INIS)

Portable dose rate meter needs to be equipped with a set of high-voltage power supply which is supplied by batteries and has characteristic of high quality, low energy expense and small size. The author introduces application conditions and performance guide line

29

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: English Abstract in english 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.

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

30

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: English Abstract in english 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.

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

2013-04-01

31

Design automation of switching mode high voltage power supply for nuclear instruments  

International Nuclear Information System (INIS)

This paper presents an automation procedure for the design of switching mode high voltage power supplies, using Pc programming facility. The procedure permits the selection of a ready made or designed ferrite transformer. This selection could be achieved according to the designer desire; as the program includes complete information about ready made ferrite transformer through complete database. The procedure is based on suggested template circuit. Micro-Cap IV simulation package is used to verify the desired high voltage power supply design. Simulation results agree quite well with suggested procedure's results. Design aspects and development needed to increase automation capabilities are also discussed

32

A remotely controlled high voltage power supply system for multiwire and drift chambers  

International Nuclear Information System (INIS)

We describe a remotely controlled power supply multichannel system delivering a current of 200 ?A per channel up to 5.5 kV, and allowing voltage setting as well as current monitoring. The system is presently used in the charmed meson photoproduction experiment (NA1) at SPS, CERN. The novel characteristics of the system are: 16 independent channels, under remote control of a standard CAMAC-minicomputer interface, and a console that allows the manual control and read-out of a maximum of 16 systems. This system can usefully replace the conventional power supplies, eliminating high voltage distribution encumbrance and often several kilometers of high voltage cables. (orig.)

33

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

Energy Technology Data Exchange (ETDEWEB)

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.

Kerdtongmee, P; Srinoum, D; Nisoa, M, E-mail: pansak20@hotmail.com [Plasma Technology for Agricultural Applications Research Laboratory, School of Science, Walailak University, Nakhon Si Thammarat (Thailand)

2011-08-15

34

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.

35

Development of an intelligent high-voltage direct-current power supply for nuclear detectors  

International Nuclear Information System (INIS)

The operation and performances of a new type direct-current high-voltage power supply are described. The power supply with intelligent feature is controlled by a single-chip microcomputer (8031), and various kinds of output voltage can be preset. The output-voltage is monitored and regulated by the single-chip microcomputer and displayed by LED. The output voltage is stable when the load current is within the allowable limits

36

Power supply, energy storage line, and grid pulsers for high voltage gridded klystrons  

International Nuclear Information System (INIS)

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

37

On impact of high voltage break down of accelerator system on ion source power supply system  

International Nuclear Information System (INIS)

Neutral beam is generated by charge transfer of fast ions extracted from the plasma box of 5MW ion source. The effects of high voltage on the auxiliary power supplies and control system of the ion source are studied. During the experimental simulation of grid break down, mal functioning of control system and failures of auxiliary power supplies are observed. The electronics of control system and power supplies are affected by the Electromagnetic interference (EMI) and charge injection, which are generated due to electro static discharge (ESD). This paper presents the description of the problems observed and corrective measures. (author)

38

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.

39

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

Science.gov (United States)

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.

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

2013-03-01

40

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.)

 
 
 
 
41

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

Science.gov (United States)

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.

Neumaier, S.; Gutbrod, H. H.; Hubbeling, T.; Kolb, B. W.; Purschke, M. L.; Ippolitov, M.; Manko, V.; Mgebrishvili, G.; Nijanin, A.; Sibiryak, Y.; Tsvetkov, A.; Vinogradov, A.; Barlag, C.; Blume, C.; Bohne, E.-M.; Bucher, D.; Claussen, A.; Peitzmann, T.; Schepers, G.; Schlagheck, H.

1995-02-01

42

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)

43

Development of high voltage power supply for the KSTAR 170 GHz ECH and CD system  

Energy Technology Data Exchange (ETDEWEB)

Highlights: • A 3.6 MW (?66 kV/55 A) gyrotron power supply system was developed for the 170 GHz ECH system in KSTAR. • The main power supply includes a total of 32 PSM based HV power supply modules. • The voltage regulation of individual HV power module and LV power module is 3 kV and 0.5 kV, respectively. • The gyrotron is protected by means of a fast solid-state switch (MOS-FET). • The HV switching system can turn off the 60 kV to the cathode within 3 ?s in the event of gyrotron faults. -- Abstract: A 3.6 MW (66 kV/55 A) DC power supply system was developed for the 170 GHz EC H and CD system in KSTAR. The power supply system consists of a cathode power supply (CPS), an anode power supply (APS) and a body power supply (BPS). The cathode power supply is capable of supplying a maximum voltage of ?66 kV and a current of 55 A to the cathode with respect to the collector using pulse step modulation (PSM). The high voltage switching system for the cathode is made by a fast MOS-FET solid-state switch which can turn off the high voltage to the cathode within 3 ?s in the occurrence of gyrotron faults. The APS is a voltage divider system consisting of a fixed resistor and zener diode units with the capability of 60 kV stand-off voltage. The anode voltage with respect to the cathode is controlled in a range of 0–60 kV by turning the MOS-FET switches connected in parallel to each zener diode on and off. For high frequency current modulation of the gyrotron, the parallel discharge switch is introduced between the cathode and anode in order to clamp the charged voltage in the stray capacitance. The BPS is a DC power supply with the capability of 50 kV/160 mA. The nominal operation parameter of BPS was 23 kV and 10 mA, respectively, and the voltage output is regulated with a stability of 0.025% of the rated voltage. The series MOS-FET solid-state switch is used for on/off modulation in the body voltage sychronizing with anode voltage. The parallel discharge switch is also introduced between the body and collector for high frequency RF modulation. This paper describes the key features of the high voltage power supply system of the KSTAR 170 GHz gyrotron as well as the test results of the power supply.

Jeong, J.H., E-mail: jhjeong@nfri.re.kr [National Fusion Research Institute, Daejeon (Korea, Republic of); Bae, Y.S.; Joung, M.; Kim, H.J.; Park, S.I.; Han, W.S.; Kim, J.S.; Yang, H.L.; Kwak, J.G. [National Fusion Research Institute, Daejeon (Korea, Republic of); Sakamoto, K.; Kajiwara, K.; Oda, Y.; Hayashi, K. [Japan Atomic Energy Agency, Naka (Japan)

2013-06-15

44

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

45

Low-Frequency High-Voltage Power Supply for Non-Thermal Plasma Generation  

International Nuclear Information System (INIS)

Full text: An economical 50-watts low-frequency high-voltage power supply with suitable performance for nonthermal atmospheric plasma generation has been developed. A neon transformer has been employed in conjunction with a sine-wave driving circuit whose frequency and output voltage can be varied. It is found from the performance test that the maximum voltage and current of 28 kV pp and 5 m A (rms), respectively, can be achieved. This power supply can be utilized for a dielectric barrier discharge plasma source, of both the coaxial and the parallel-plate types at frequency range between 100 Hz to 750 Hz

46

Computer controlled multiple channel high voltage power supply [Paper No.: L8  

International Nuclear Information System (INIS)

This paper describes the design of a computer controlled high voltage multiple channel power supply for use in Gamma Ray Astrophysics Experiment (GRAPE). Each channel is rated for 2.5 kV, 1mA with over current protection and output voltage read back facility. A single HV supply on a single width NIM module has been tried successfully. At present 8 channels on a module is being tried to make a very compact HV system. (author). 2 refs., 2 figs

47

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)

48

An approach for high voltage power supply system for HCAL of LHCb experiment  

International Nuclear Information System (INIS)

The main aim of the calorimeter system of the LHCb (Large Hadron Collider Beauty) experiment dedicated to precision measurements of CP violation and rare phenomena is to provide identification of the electrons, hadrons and photons, for the level-0 trigger and offline analysis with measurements of position and energy. The system consists in a scintillator pad/preshower (SPD/PS) detector, an electromagnetic calorimeter (ECAL) and a hadron calorimeter (HCAL), all the sub-detectors having a similar technology with scintillating tiles as active material and being read out via wavelength-shifting fibers and with an identical readout electronics for ECAL and HCAL and similar electronics for the PS. During 1997-1999 a computer controlled High Voltage (HV) distribution scheme was developed by Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH) group and used to supply the PMTs of half HCAL prototype during the beam tests (1998-2000). This scheme consisted of three parts: 1) a control box which includes low voltage power supply, the RS232 interface to a PC and three modules of high voltage power supply; 2) two types of multichannel HV distributors with an individual voltage setting; 3) a software package to control all settings and refresh them periodically. Based on the acquired experience, a new design for a High Voltage Power Supply (HVPS) which satisfies the LHCb requirements has been developed for PMTs of the hadron calorimeter. The demands of th the hadron calorimeter. The demands of this system are simplicity and low cost. This HVPS with multiple outputs (HV for photocathode and D1 - D4 dynodes) is destined to supply, with the same high voltage, groups of PMTs sorted by similar characteristics as gain and sensitivity. Because of the high rates (? 40 MHz) supported by PMTs, booster voltage sources are necessary to supply current for the last 4 dynodes. The box has 5 HV power supplies for photocathodes and the last 4 dynodes, each HV power supply being followed by a 4 channel distributor (10 mA/channel). The box can independently supply 4 groups of 40 PMTs each. The voltage setting can be made manually, through keyboard and LCD display located on the front panel using a ?C board which also contains a CAN interpreter, SJA 1000, that makes the serial CAN-bus link remotely. The connection is bidirectional allowing both the setting of output voltages and the reading of the output voltage and current values. The power supply has good output features, shortcut protection and special voltages. The output voltages for a group are given. The box dimensions are: 480 x 128 x 525 mm. The voltages are transmitted trough HV coaxial cables with SHV connectors. The PMTs of FEU-115m10 type were used. In the following HV system will be adapted to be used to supply PMTs of Hamamatsu type R7899 20 which have been largely investigated by LHCb collaboration. HV Power Supply is going to be integrated in CAN network. This HVPS with parallel power groups of fast PMTs has the following advantages: a) outside PMTs supply (power dissipation is not inside HCAL modules); b) very good stability for all HV supplies (photocathode and dynodes); c) low ripple because of distributor supplementary stabilization with series transistors; d) great reserve of current (it allows high counting rates); f) being operated remotely it needs not to be radiation-proof; g) easy service. The system can be used in any experiments with many fast PMTs. (authors)

49

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)

50

OPC Server and BridgeView Application for High Voltage Power Supply Lecroy 1458  

CERN Document Server

Abstract The aim of this project was to develop an OPC server to communicate over an RS232 serial line. This communication media is commonly used with commercial instruments. The development was made for a High Voltage power supply in the context of the Alice [1] experiment. In addition, the structured modular concept will allow changing the transmission media or power supply type with little effort. The high voltage power supply should be accessible remotely through a network. OPC[2] is an acronym for OLE[3] for Process Control. OPC is based on the DCOM [3] communication protocol, which allows communication with any computer running a Windows based OS. This standard is widely used in industry to access device data through Windows applications. The concept is based on the client-server architecture. The hardware and the software architecture are described. Subsequently details of the implemented programs are given with emphasis on the possibility to replace parts of the software in order to use differ...

Swoboda, D; CERN. Geneva

2000-01-01

51

Characterization of a pulsed mode high voltage power supply for nuclear detectors  

International Nuclear Information System (INIS)

This paper discusses the characterization of a pulsed mode high voltage power supply (HVPS) using LT1073 chip. The pulsed modulated signal generated from this chip is amplified using a step-up ferrite core transformer of 1:20 turn ratio and then further multiplied and converted into DC high voltage output using a diode-capacitor arrangement. The circuit is powered by a 9V alkaline battery but regulated at 5V supply. It was found that the output for this setup is 520V, 87 ?A with 10% load regulation. This output is suitable to operate a pancake-type GM detector, typically model LND 7317 where the plateau is from 475V to 675V. It was also found that when a ?-source with intensity of 120 cps is used, the power consumption of the circuit is 5 V, 10.1 mA only. When the battery was left 'on' for 40 hours continuously, the battery's voltage has dropped to 6.9V, meaning that the 5V supply as well as 520V output is still maintained. It is noted that the minimum output voltage of 475V has reached when the regulated supply has reduced to 4.6V and consequently the 9V battery dropped to 6.5V, and this had happened after approximately 3 days of continuous operation. The power efficiency for this circuitry was found to be 89.5%. This result has far better in performance since the commercial portable equipment of this type has normally specified that not less than 8 hours continuous operation only. On the circuit design for this power supply, it was found that the enveloped frequen it was found that the enveloped frequency is 133 Hz with approximately 50% duty cycle. The modulated frequency during 'on' state was found to be 256 KHz in which the majority of power consumption is required.

52

High-Voltage Power Supply With Fast Rise and Fall Times  

Science.gov (United States)

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.

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

2007-01-01

53

Low-noise high-voltage DC power supply for nanopositioning applications  

CERN Document Server

Nanopositioning techniques currently applied to characterize physical properties of materials interesting for applications at the microscopic scale rely on high-voltage electronic control circuits that should have the lowest possible noise level. Here we introduce a simple, flexible, and custom-built power supply circuit that can provide +375\\,V with a noise level below 10\\,ppm. The flexibility of the circuit comes from its topology based on discrete MOSFET components that can be suitable replaced in order to change the polarity as well as the output voltage and current.

Belussi, Cristian H; Fasano, Yanina

2014-01-01

54

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)

55

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

Energy Technology Data Exchange (ETDEWEB)

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.

Bradley Iii, Joseph Thomas [Los Alamos National Laboratory; Rees, Daniel E [Los Alamos National Laboratory; Roybal, William T [Los Alamos National Laboratory; Young, Karen A [Los Alamos National Laboratory

2008-01-01

56

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)

57

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

Science.gov (United States)

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.

Bearden, Douglas

2007-01-01

58

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

Directory of Open Access Journals (Sweden)

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;}

Nima Rostampour

2012-10-01

59

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.

60

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

Energy Technology Data Exchange (ETDEWEB)

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.

Gassmann, T., E-mail: thibault.gassmann@iter.org [ITER Organization, CS 90 046, 13067 St. Paul Lez Durance Cedex (France); Arambhadiya, B.; Beaumont, B. [ITER Organization, CS 90 046, 13067 St. Paul Lez Durance Cedex (France); Baruah, U.K. [Institute for Plasma Research, Near Indira Bridge, Bhat, Gandhinagar 382428 (India); Bonicelli, T. [Fusion For Energy, C/3 Josep Pla 2, Torres Diagonal Litoral-B3, E-08019 Barcelona (Spain); Darbos, C.; Purohit, D.; Decamps, H. [ITER Organization, CS 90 046, 13067 St. Paul Lez Durance Cedex (France); Albajar, F. [Fusion For Energy, C/3 Josep Pla 2, Torres Diagonal Litoral-B3, E-08019 Barcelona (Spain); Gandini, F.; Henderson, M.; Kazarian, F.; Lamalle, P.U.; Omori, T. [ITER Organization, CS 90 046, 13067 St. Paul Lez Durance Cedex (France); Parmar, D.; Patel, A. [Institute for Plasma Research, Near Indira Bridge, Bhat, Gandhinagar 382428 (India); Rathi, D. [ITER Organization, CS 90 046, 13067 St. Paul Lez Durance Cedex (France); Singh, N.P. [Institute for Plasma Research, Near Indira Bridge, Bhat, Gandhinagar 382428 (India)

2011-10-15

 
 
 
 
61

PC-based control of high voltage power supply for HPGe detectors  

International Nuclear Information System (INIS)

NIM standard dual high voltage supply units being used in the laboratory for biasing high purity germanium detectors. The biasing of the detector is usually done slowly with constant monitoring of the output signal of the preamplifier for the health of FET, used in the first stage of the circuit. The units provide digital display of the applied voltage and current

62

An 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

63

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

Energy Technology Data Exchange (ETDEWEB)

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.

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

64

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

65

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

Science.gov (United States)

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

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

2014-05-01

66

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

Directory of Open Access Journals (Sweden)

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.

Zhenbao Zhu

2009-02-01

67

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)

68

Cable Insulation Breakdowns in the Modulator with a Switch Mode High Voltage Power Supply  

CERN Document Server

The Advanced Photon Source modulators are PFN-type pulsers with 40 kV switch mode charging power supplies (PSs). The PS and the PFN are connected to each other by 18 feet of high-voltage (HV) cable. Another HV cable connects two separate parts of the PFN. The cables are standard 75 kV x-ray cables. All four cable connectors were designed by the PS manufacturer. Both cables were operating at the same voltage level (about 35 kV). The PS?s output connector has never failed during five years of operation. One of the other three connectors failed approximately five times more often than the others. In order to resolve the failure problem, a transient analysis was performed for all connectors. It was found that transient voltage in the connector that failed most often was subjected to more high-frequency, high-amplitude AC components than the other three connectors. It was thought that these components caused partial discharge in the connector insulation and led to the insulation breakdown. Modification o...

Cours, A

2004-01-01

69

The analysis to the disadvantages of the conventional pulse high-voltage DC power supply and the relevant solvent  

International Nuclear Information System (INIS)

Conventional pulse high-voltage DC power supply for the microwave assistant heating for the plasma adopt phase control convertor. The power supply mode has steady topology and experience, offering many microwave equipment presently. And the filters on the high-voltage side not only threaten the Klystron but also the power supply, and the dynamic response only arrives microsecond. In addition, the installation and maintenance of the power supply with the huge power components are difficult. The advancement of microwave industry require a new power supply, higher power from several thousands to hundred thousands voltage, faster dynamic response from millisecond to hundred microsecond, longer static state pulse from millisecond to second. The expensive microwave tube must be protected correctly when short circuit occurs. Switch mode with PWM convertor adopts multi-phase commutator to solve the problems. It is recommended in the article the compare and analysis of two power supply modes. The results of electromagnetism emulator are also presented which can validate the feasibility of the switch mode project

70

High-voltage high-power resistive divider for TFTR neutral-beam power supply  

International Nuclear Information System (INIS)

The neutral-beam source at the Tokamak Fusion Test Reactor (TFTR) requires a voltage divider to supply the gradient grid. The requirements are simple, but stringent: it must dissipate 576 kW of peak power at 120 kV dc. Average power is 19.2 kW. A special resistive divider, indirectly water cooled, has been successfully developed for this purpose. The divider is unusually large physically, weighing 1290 kg when filled, and its cooling system is believed to be unique, conferring unusual advantages. The divider consists of an array of 9000 commercial resistors immersed in a plastic tank of inert fluid. The resistors are cooled by subcooled-pool boiling at their surfaces, and the fluid is vigorously circulated by natural convection. A fluid-to-water heat exchanger above the resistors removes the deposited energy and limits the average temperature of the system. The tank is covered by a constant-pressure diaphragm seal. The heat capacity of the system reliably averages the pulse power, and there are no pumps or other moving parts. Operation of the system, which is intrinsically self-regulating, is relatively unaffected by leakage or noncondensible gas

71

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

International Nuclear Information System (INIS)

A description is given of 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. (author)

72

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

73

Study on Power Supply System by Using CT in High-Voltage Transmission Lines  

Directory of Open Access Journals (Sweden)

Full Text Available In online monitoring of the transmission line, its power supply is one of the key issues. This study presents a device using special transformer which can induce power to supply the high side circuitry. The front-end of the protection device includes output-power-control circuitry, which can take output-power limited to a small range. At the back side it contains rechargeable lithium batteries. By using the reasonable control strategy, it can provide a stable output-power at the transmission line current ranging from 40 to 1500A. And in the larger current the fever of transformer is not serious. Experiments show that the power supply system has the high reliability and efficiency.

He Zhi-Min

2013-10-01

74

A high-current, high-voltage power supply with special output current waveform for APS injector synchrotron dipole magnets  

International Nuclear Information System (INIS)

This paper describes a high-voltage, high-current power supply for the injector synchrotron dipole magnets at APS. In order to reset the dipole magnets in each cycle two different current waveforms are suggested. The first current waveform consists of three sections, namely: dc-reset, linear ramp, and recovery sections where injection is done ''on the fly''. The second current waveform consists of six different sections, dc-reset, transition to injection level, injection flat level, parabolic, linear ramp and recovery sections. The effect of such waveforms on the beam is discussed and the power supply limitations to follow such waveforms are given. The power supply limitations are due to the power components and control loops. The reference for the current loop is generated by a DAC which is discussed

75

MAGY: An innovative high voltage-low current power supply for gyrotron  

Energy Technology Data Exchange (ETDEWEB)

From the electrical point of view, the body and the anode of high power gyrotrons behave as capacitive loads. A highly dynamic power supply is, therefore, hard to achieve. The MAGY concept (Modulator for the Anode of a triode type GYrotron) embodies an innovative solution to manage the capacitive current ensuring a very low ripple on the output voltage. It consists of a series of independent, bi-directional and regulated DC sources. Compared to existing topologies, this solution requires a smaller number of power modules. It avoids internal high frequency modulation and simultaneously offers high resolution of the output voltage and a wide range of operating scenarios.

Siravo, Ugo, E-mail: ugo.siravo@epfl.ch [Centre de Recherche en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Alex, Juergen; Bader, Michael [Thomson Broadcast and Multimedia AG, CH-5300 Turgi (Switzerland); Carpita, Mauro [Haute Ecole d' Ingenierie et de Gestion du Canton de Vaud, HES-S0, University of Applied Sciences of Western Switzerland, CH-1400 Yverdon-les-Bains (Switzerland); Fasel, Damien [Centre de Recherche en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); Gavin, Serge [Haute Ecole d' Ingenierie et de Gestion du Canton de Vaud, HES-S0, University of Applied Sciences of Western Switzerland, CH-1400 Yverdon-les-Bains (Switzerland); Perez, Albert [Centre de Recherche en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland)

2011-10-15

76

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)

77

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

Science.gov (United States)

A proposed multiloop power supply would generate a potential as high as 1.25 kV with rise and fall times 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.

Bearden, Douglas

2007-01-01

78

Design, Analysis &Implementation of Negative High Voltage DC Power Supply Using Voltage Multiplier Circuits.  

Directory of Open Access Journals (Sweden)

Full Text Available Voltage multipliers are widely used in many highvoltage and low-current applications where input voltage stability is not the major concern. Some application like microwave tubes requires negative high voltage for their safe operation. In this paper the design aspects of multiplier circuits are taken in account on the basis of analysis and simulation results. Simulation is done using PSIM Software and Implementation is done on basis of simulation results and theoretical calculation.

Priyen S. Patel* & D.B. Dave

2013-04-01

79

Design and construction of a variable high voltage DC power supply for Tandem ion source (Paper No. CP 8)  

International Nuclear Information System (INIS)

This paper discusses the design approach and status of a amplitude modulated, fixed drive, dc to dc converter principle and voltage multiplier principle adopted for generation of a high voltage. High frequency operation has resulted in smaller magnetics and smaller filters capacitance. Specially tailored base drive circuits and snubber circuits have resulted in reduction in switching transistor losses and hence improvement in efficiency of converter. Both constant voltage and constant current mode operation with fast acting overload and short circuit protection alongwith polarity reversal arrangement has made this supply extremely suitable for tandem ion source application. Normally this power supply is operated in constant voltage mode and once the set current limit is exceeded it goes automatically into the constant current mode. Output voltage and current are continuously adjustable from 0-30 kV and 0-8 mA respectively. (author). 4 refs., 4 f igs

80

Characterization of Variable High Voltage D. C. Power Supply Designed and Constructed for Low Pressure Gas Discharge  

Directory of Open Access Journals (Sweden)

Full Text Available In this work we characterized a variable high voltage DC power supply, designed and constructed for low pressure gas discharge, suitable for laser pumping and plasma production. A homemade transformer was performed to obtain maximum output voltage of 30 KV and current variation of 100 mA which is required for laser production and plasma creation. A mixture of CO2, N2 and He was tested with different pressures and variable flow rates for discharge evaluation and parameters validation. The peaks intensities of the discharge emission spectrum were linearly related to current variation, which showed homogenous peaks rising up as a good indication of the system power stability. On the same manner, the system efficiency was evaluated form the input electrical power and the electrical energy dissipated inside a discharge cavity, which was approximately equal 20%.

A.M. Abdelbagi

2011-12-01

 
 
 
 
81

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)

82

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

Energy Technology Data Exchange (ETDEWEB)

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 analyse how a passive network without sources influences the inverter. The transmission, with its current controlled rectifier and large inductance, is simulated as a current source. Under these circumstances the analysis shows that the network frequency has to adapt in order to keep the active and reactive power balance until the controllers are able to react. The concept of firing angle for a thyristor is limited in a system with variable frequency, the actual control parameter is the firing delay time. Sensitivity analysis showed some astonishing consequences. The frequency rises both by an increase in the active and in the reactive load. The voltage falls by an increase in the active load, but rises by an increase in the inductive load. Two different control principles for the system of inverter, synchronous compensator and load are defined. The first takes the reference for the firing delay time from the fundamental voltage at the point of common coupling. The second takes the reference for the firing delay time from the simulated EMF of the synchronous compensator. Of these, the second is the more stable and should be chosen as the basis for a possible control system. Two simulation tools are applied. The first is a quasi-phasor model running on Matlab with Simulink. The other is a time domain model in KREAN. The time domain model is primarily used for the verification of the quasi-phasor model, and shows that quasi-phasors is still a valuable tool for making a quick analysis of the main features when the details of the transients are of less importance. The study indicates that power supply by HVDC transmission from land to offshore oil installations could be technically feasible, even without the large synchronous compensators normally required. It has been shown that in a network only supplied by an inverter, variations of active and reactive loads have significant influence on both voltage and frequency. Particularly it should be noted that the frequency shows a positive sensitivity to increases in load. This could make the system intrinsically unstable in the case of a frequency dependent load such as motors. It was not a part of the study to optimize controllers, but even with simple controllers it was possible to keep the frequency within limits given by norms and regulations, but the voltages were dynamically outside the limits, though not very far. These voltage overswings take place in the first few instances after a disturbance, so it takes unrealistically fast controllers to handle them. They are partly due to the model, where the land based rectifier and the DC reactors are simulated by a constant current source, but partly they have to be handled by overdimensioning of the system. The simulations indicate that it should be technically possible to supply an oil platform with electrical power from land by means of HVDC transmission with small synchronous compensators. Whether this is financially feasible has not been investigated. Neither has it been considered whether the necessary equipment can actually be installed on an oil platform. Recently both ABB and Siemens have presented solutions for HVDC transmission in the lower and medium power range based on voltage source converters based on IGBTs. Fully controllable voltage source HVDC converters have properties that may be better suited than conventional line commutated current source thyristor inverters, to supply weak or passive networks, such as offshore oil installations, with electrical power. But they also have some disadvantages, and a complete technical and fina

Myhre, Joergen Chr.

2001-07-01

83

Power-supply system for high-voltage electron guns with grid control  

International Nuclear Information System (INIS)

A power-supply system for electron guns with grid control is described which consists of a source of accelerating voltage between 20 and 180 kV with a current of 100 mA and a control circuit for an electron gun that contains a pulse generator having an output voltage of up to 5 kV for pulse durations of 2, 10, 50 and 90 microseconds. The output pulses of the generator are synchronized with a certain phase of the cathode heater current of the gun, and they can be repeated at a frequency between 100 and 0.4 Hz. The system is reliable and resistant to the overloads associated with breakdowns in the gun

84

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

Science.gov (United States)

A proposed multiloop power supply would generate a potential as high as 1.25 kV with rise and fall times 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.

Bearden, Douglas

2007-01-01

85

Development of cast resin multisecondary 1600kVA transformer for Regulated High Voltage Power Supply- A prototype  

International Nuclear Information System (INIS)

Regulated High Voltage Power Supplies (RHVPS) are commonly used in high-energy particle accelerators. RHVPS is a modular power supply in which kV level modules (40 or 80) are cascaded to generate desired level of voltage/power. One of the most challenging tasks involved is to provide input power to number of rectifier modules with required isolation (inter-winding and winding to ground). This is accomplished by deploying multi-secondary (large numbers, say 40 secondaries) transformers. This RHVPS concept was realized for the first time in the country with development of oil filled multi-secondary transformer. A pair of 3.3MVA, 11kV/ (940Vx40) has been successfully demonstrated, isolation of 6kVDC (inter-winding) and 160kVDC (all secondary to ground) tested. The next generation power supplies are unitized with indoor installations. This has created the demand for dry type multi-secondary transformers in compliance with safety regulations. This paper presents manufacturing issues and testing of the prototype resin cast coil. On the manufactured prototype, inter-winding isolation is tested up to 6kVDC and 125kVDC with respect to ground.

86

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

87

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

Energy Technology Data Exchange (ETDEWEB)

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.

Clow, D.D.; Kellman, D.H.

1991-10-01

88

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

89

High voltage power supply systems for electron beam and plasma technologies. Its new element base  

International Nuclear Information System (INIS)

Transforming technique and high voltage technique supplementing each other more and more unite in indivisible constructions of modern apparatuses and systems and applicated in modern technologies providing its high efficiency. Specially worked out, ecologically clean, inertial, inflammable perfluororganic liquid is used in elements and electronic apparatuses simultaneously as insulating and cooling media. This liquid is highly fluid, fills tiny cavities in construction elements and in the places of high concentration of losses, where maximum local overheating of active parts or apparatus constructions takes place, it transforms to boiling state with highly intensive taking off of heat energy from cooled surface point. For instance, being cooled by mentioned perfluororganic liquid, copper wire can conduct current to 50 A/mm2 density, but in ordinary conditions of transformers, reactors and busses, current density can reach only few Amperes. Possibility of considerable increasing of current density, that is reached by means of intensive cooling, provided by worked out liquid, and taking into account its incredibly high insulating features (liquid has electric strength to 50 KV/mm) allows to provide optimum heat regime of active parts of transformers. reactors, condenser, semiconductor devices, resistors, construction elements and electrotechnical apparatus in general. Particularly high effect of decreasing of weight and dimensions characteristics of elements and electrotechnical apparatus in general can be reached under working out of special constructions of each element and apparatus details, adapted to use of mentioned liquid as insulating and cooling media

90

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

DEFF Research Database (Denmark)

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.

Andersen, Thomas; RØdgaard, Martin SchØler

91

Development of an amorphous surge blocker for a high voltage acceleration power supply of the neutral beam injectors  

International Nuclear Information System (INIS)

An amorphous surge blocker for a high voltage acceleration power supply for the neutral beam injectors has been developed. Since the saturation magnetic flux density of the amorphous core is higher than that of the ferrite core, the surge blocker made of amorphous cores can be reduced in size appreciably compared to the conventional ferrite surge blocker. A 350 kV, 0.05 volt-second amorphous surge blocker was designed, fabricated and tested. The amorphous core was made by winding an amorphous tape with a film for the layer insulation and was heat-treated to recover the magnetic characteristics. The core is molded by epoxy resin and installed in a FRP insulator tube filled with SF6 gas for the insulation. The volt-second measured was higher than the designed value and the electrical breakdown along the cores and between layers was not observed. This test result shows that the amorphous surge blocker is applicable for a dc acceleration power supply for high energy neutral beam injectors. (author)

92

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

93

High voltage photovoltaic power converter  

Science.gov (United States)

An array of independently connected photovoltaic cells on a semi-insulating substrate contains reflective coatings between the cells to enhance efficiency. A uniform, flat top laser beam profile is illuminated upon the array to produce electrical current having high voltage. An essentially wireless system includes a laser energy source being fed through optic fiber and cast upon the photovoltaic cell array to prevent stray electrical signals prior to use of the current from the array. Direct bandgap, single crystal semiconductor materials, such as GaAs, are commonly used in the array. Useful applications of the system include locations where high voltages are provided to confined spaces such as in explosive detonation, accelerators, photo cathodes and medical appliances.

Haigh, Ronald E. (Arvada, CO); Wojtczuk, Steve (Cambridge, MA); Jacobson, Gerard F. (Livermore, CA); Hagans, Karla G. (Livermore, CA)

2001-01-01

94

Design and evaluation of tapped inductors for high-voltage auxiliary power supplies for modular multilevel converters  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Tapped-inductor buck converters can provide large step-down ratios at high efficiency and are well suited in auxiliary power supplies for modular multilevel converter cells supplying gate drive units etc. In this paper the design and testing of three low-leakage tapped inductors for use in a 3kV, 100W buck converter is described.

Mode?er, Tomas; Zdanowski, Mariusz; Nee, Hans-peter

2012-01-01

95

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)

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.

BOUBKAR BAHANI

2014-10-01

96

The design of high-voltage and stable power based on PWM technology  

International Nuclear Information System (INIS)

A high-voltage and stable power based on PWM technology was introduced in this paper, which is principally used as the detector's high-voltage power. The high-voltage power adopts integrated circuit, which is integrated controller TL494, producing square wave control signal. The power supply adopts transformer-isolated forward converter topology. Since the performance of high-voltage power is stable and reliable in the experiment, it could be used as the detector's high-voltage power. (authors)

97

Low power, scalable multichannel high voltage controller  

Science.gov (United States)

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.

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

2008-03-25

98

High voltage, high power nested high voltage accelerator  

International Nuclear Information System (INIS)

The Nested High Voltage Generator (NHVG, North Star Research Corp. patent pending) is a unique new type of accelerator based on the principle of the Faraday cage. It consists of a number of individual high voltage sections which are placed inside of the adjacent accelerator section, or nested one inside the other. Electronics internal to each of the NHVG stages sets the voltage between the inner and outer Faraday cage to some voltage V. By building N stages and placing them one inside the other, the authors can produce a DC voltage N xV. In this paper the authors describe the advantages of this type of accelerator along with the results of work with the two small NHVG accelerators which the authors have built so far

99

Design and construction of a 500 watts variable high voltage dc power supply for He-Cd plasma tube in laser application  

International Nuclear Information System (INIS)

This paper discusses the design approach and status of a amplitude modulated, fixed drive, dc to dc converter principle adopted for generation of high voltage. High frequency operation has resulted in smaller magnetics and smaller filter capacitance. Specially tailored base drive circuits and snubber circuits have resulted in reduction in switching transistor losses and improvement in efficiency of converter. Both constant voltage and constant current mode of operation with fast acting overload and short circuit protection has made this power supply extremely suitable for operation of plasma tube in laser application where load transients are very common. Before the plasma formation, this power supply operates in constant voltage mode at 8 kV. Once the tube striking take place, it automatically goes into constant current mode to maintain constant laser power. Experimental results show that at 4.5 kV and 110 mA, lasing action is optimum. This power supply is in operation for the last two years in PURNIMA at Bhabha Atomic Research Centre, Trombay. (author). 3 refs., 2 figs., 1 tab

100

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 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

 
 
 
 
101

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

102

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)

103

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

Energy Technology Data Exchange (ETDEWEB)

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.

Lee, S S; Iqbal, S; Kamarol, M, E-mail: shahidsidu@hotmail.com [School of Electrical and Electronics Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang (Malaysia)

2011-09-15

104

Experiment and operation of a LHCD-35 kV/2.8 MW/1000 s high-voltage power supply on HT-7 tokamak  

International Nuclear Information System (INIS)

A-35 kV/2.8 MW/1000s high-voltage power supply (HVPS) for HT-7 superconducting tokamak has been built successfully. The HVPS is scheduled to run on a 2.45 GHz/1 MW lower hybrid current drive (LHCD) system of HT-7 superconducting tokamak before the set-up of HT-7 superconducting tokamak in 2003. The HVPS has a series of advantages such as good steady and dynamic response, logical computer program controlling the HVPS without any fault, operational panel and experimental board for data acquisition, which both are grounded distinctively in a normative way to protect the main body of HVPS along with its attached equipment from dangers. Electric power cables and other control cables are disposed reasonably, to prevent signals from magnetic interference and ensure the precision of signal transfer. The author introduced the experiment and operation of a 35 kV/2.8 MW/1000 s HVPS for 2.45 GHz/1 MW LHCD system. The reliability and feasibility of the HVPS has been demonstrated in comparison with experimental results of original design and simulation data

105

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

Science.gov (United States)

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.

Lee, S. S.; Iqbal, S.; Kamarol, M.

2011-09-01

106

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.

107

High voltage solar cell power generating system  

Science.gov (United States)

A laboratory solar power system regulated by on-panel switches has been delivered for operating high power (3 kW), high voltage (15,000 volt) loads (communication tubes, ion thrusters). The modular system consists of 26 solar arrays, each with an integral light source and cooling system. A typical array contains 2,560 series-connected cells. Each light source consists of twenty 500-watt tungsten iodide lamps providing plus or minus 5 percent uniformity at one solar constant. An array temperature of less than 40 C is achieved using an infrared filter, a water-cooled plate, a vacuum hold-down system, and air flushing.

Levy, E., Jr.; Opjorden, R. W.; Hoffman, A. C.

1974-01-01

108

Advanced High Voltage Power Device Concepts  

CERN Document Server

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 ...

Baliga, B Jayant

2012-01-01

109

High Voltage Power Transmission for Wind Energy  

Science.gov (United States)

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.

Kim, Young il

110

High voltage supply for neutron tubes in well logging applications  

Science.gov (United States)

A high voltage supply is provided for a neutron tube used in well logging. The "biased pulse" supply of the invention combines DC and "full pulse" techniques and produces a target voltage comprising a substantial negative DC bias component on which is superimposed a pulse whose negative peak provides the desired negative voltage level for the neutron tube. The target voltage is preferably generated using voltage doubling techniques and employing a voltage source which generates bipolar pulse pairs having an amplitude corresponding to the DC bias level.

Humphreys, D. Russell (Albuquerque, NM)

1989-01-01

111

Utilização de um monitor de vídeo como fonte de alta tensão para eletroforese capilar Utilization of a conventional CRT monitor as a high voltage power supply for capillary electrophoresis  

Directory of Open Access Journals (Sweden)

Full Text Available This article describes the use of a conventional CRT monitor as a high voltage power supply for capillary electrophoresis. With this monitor, a 23-kV high voltage with a ripple of 1.32% was observed. The reproducibility of the applied high voltage was evaluated by measuring the standard deviations of peak area and migration time for five consecutive injections of a test mixture containing potassium, sodium, and lithium cations at 50 mmol L-1. The errors were about 2.5% and 0.6% for peak area and migration time, respectively. The maximum current tested was about 180 mA, which covers most capillary electrophoresis applications. This system has been successfully used for several months, maintaining the desired level of performance.

José Alberto Fracassi da Silva

2006-12-01

112

Utilização de um monitor de vídeo como fonte de alta tensão para eletroforese capilar / Utilization of a conventional CRT monitor as a high voltage power supply for capillary electrophoresis  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english This article describes the use of a conventional CRT monitor as a high voltage power supply for capillary electrophoresis. With this monitor, a 23-kV high voltage with a ripple of 1.32% was observed. The reproducibility of the applied high voltage was evaluated by measuring the standard deviations o [...] f peak area and migration time for five consecutive injections of a test mixture containing potassium, sodium, and lithium cations at 50 mmol L-1. The errors were about 2.5% and 0.6% for peak area and migration time, respectively. The maximum current tested was about 180 mA, which covers most capillary electrophoresis applications. This system has been successfully used for several months, maintaining the desired level of performance.

José Alberto Fracassi da, Silva; Leonardo, Frasatto.

1377-13-01

113

Power supply  

Science.gov (United States)

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered power.

Yakymyshyn, Christopher Paul (Seminole, FL); Hamilton, Pamela Jane (Seminole, FL); Brubaker, Michael Allen (Loveland, CO)

2007-12-04

114

High voltage generator for the power supply of photomultipliers in the time of flight system of Alpha Magnetic Spectrometer-2 experiment  

International Nuclear Information System (INIS)

In this report, the behaviour of the first prototype high voltage generator (HVG) that might be used in the time of flight (TOF) system for the AMS-2 experiment is described. The system receives a positive continuous voltage about 100-120 V as input, and it provides a programmable negative continuous voltage from -1600 to -2400 V as output, versus a total load of 50 M?. The most important aspect is the absence of a transformer which usually is used in the step-up DC-DC converters. In the TOF system of alpha magnetic spectrometer (AMS)-2 experiment there is a big magnetic field, higher than 2 kG, that does not allow to use a transformer, therefore this prompted us to use the Cockroft-Walton system. The power consumption is about 300 mW and the peak-to-peak high frequency ripple is lower than 0.3% of the output high voltage. We also estimated the reliability of the HVG and we obtained a failure probability lower than 0.5% after three years of continuous functioning. Besides, in this report, much importance was given to the calculation of a simple model of the system to estimate the stability margins

115

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

116

Radio-frequency powered glow discharge device and method with high voltage interface  

Science.gov (United States)

A high voltage accelerating potential, which is supplied by a high voltage direct current power supply, is applied to the electrically conducting interior wall of an RF powered glow discharge cell. The RF power supply desirably is electrically grounded, and the conductor carrying the RF power to the sample held by the probe is desirably shielded completely excepting only the conductor's terminal point of contact with the sample. The high voltage DC accelerating potential is not supplied to the sample. A high voltage capacitance is electrically connected in series between the sample on the one hand and the RF power supply and an impedance matching network on the other hand. The high voltage capacitance isolates the high DC voltage from the RF electronics, while the RF potential is passed across the high voltage capacitance to the plasma. An inductor protects at least the RF power supply, and desirably the impedance matching network as well, from a short that might occur across the high voltage capacitance. The discharge cell and the probe which holds the sample are configured and disposed to prevent the probe's components, which are maintained at ground potential, from bridging between the relatively low vacuum region in communication with the glow discharge maintained within the cell on the one hand, and the relatively high vacuum region surrounding the probe and cell on the other hand. The probe and cell also are configured and disposed to prevent the probe's components from electrically shorting the cell's components. 11 figures.

Duckworth, D.C.; Marcus, R.K.; Donohue, D.L.; Lewis, T.A.

1994-06-28

117

Development and application of multi-channel programme control high voltage power in nuclear detection  

International Nuclear Information System (INIS)

A kind of knockdown multi-channel programme control high voltage power has been developed and fabricated, including facility box, power supply, high voltage output plug and PC communication plug, which has such characteristics as compact integration, high reliability, high measurement precision, stable voltage output, small ripple wave and good consistency. A 1000-channel programme control high voltage power supply has been successfully developed and applied to Large Area Neutron Spectroscopy Array (LaNSA) in the large-scale experiment performed at Shenguang ? prototype laser facility, and reliable experimental data have been obtained. (authors)

118

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)

119

High voltage power condition systems powered by flux compression generators  

Science.gov (United States)

Compact, high-gain magnetic flux compressors (FCGs) are convenient sources of substantial energy for plasma-physics and electron-beam-physics experiments, but the need for high-voltage, fast-rising pulses is difficult to meet directly with conventional generators. While a variety of novel concepts employing simultaneous, axially-detonated explosive systems are under development, power-conditioning systems based on fuse opening switches and high-voltage transformers constitute another approach that complements the fundamental size, weight, and configuration of the small helical flux compressor. In this paper, we consider first a basic inductive store/opening switch circuit and the implications associated with, specifically, a fuse opening switch and an FCG energy source. We develop a general solution to a transformer/opening switch circuit---which also includes (as a special case) the direct inductive store/opening switch circuit (without transformer) and we report results of one elementary experiment demonstrating the feasibility of the approach.

Reinovsky, R. E.; Lindemuth, I. R.; Vorthman, J. E.

120

Living and Working Safely Around High-Voltage Power Lines.  

Energy Technology Data Exchange (ETDEWEB)

High-voltage transmission lines can be just as safe as the electrical wiring in the homes--or just as dangerous. The crucial factor is ourselves: they must learn to behave safely around them. This booklet is a basic safety guide for those who live and work around power lines. It deals primarily with nuisance shocks due to induced voltages, and with potential electric shock hazards from contact with high-voltage lines. References on possible long-term biological effects of transmission lines are shown. In preparing this booklet, the Bonneville Power Administration has drawn on more than 50 years of experience with high-voltage transmission. BPA operates one of the world`s largest networks of long-distance, high-voltage lines. This system has more than 400 substations and about 15,000 miles of transmission lines, almost 4,400 miles of which are operated at 500,000 volts.

United States. Bonneville Power Administration.

2001-06-01

 
 
 
 
121

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

Science.gov (United States)

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.

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

1974-01-01

122

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

123

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

Science.gov (United States)

...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...

2010-07-01

124

A high voltage power converter for space astronomy applications  

Science.gov (United States)

A dc-dc low-power, high-voltage converter for use in space is described which furnishes a commandable, low-noise dc output in the range of 0 to -7500 V. The converter is suitable for biasing of detectors commonly employed in space astronomy, microchannel plates, photomultipliers, and gas discharge detectors. The converter's reliability has been demonstrated by accelerated life testing under thermal vacuum. The electrical and mechanical design, packaging, layout and fabrication techniques, and tests employed are described.

Ray, David C.; Lampton, Michael L.

1988-01-01

125

A method for encapsulating high voltage power transformers  

Science.gov (United States)

Voltage breakdowns become a major concern in reducing the size of high-voltage power converter transformers. Even the smallest of voids can provide a path for corona discharge which can cause a dielectric breakdown leading to a transformer failure. A method of encapsulating small high voltage transformers has been developed. The method virtually eliminates voids in the impregnation material, provides an exceptional dielectric between windings and provides a mechanically rugged package. The encapsulation material is a carboxyl terminated butadiene nitril (CTBN) modified mica filled epoxy. The method requires heat/vacuum to impregnate the coil and heat/pressure to cure the encapsulant. The transformer package utilizes a diallyl phthalate (DAP) contact assembly in which a coated core/coil assembly is mounted and soldered. This assembly is then loaded into an RTV mold and the encapsulation process begins.

Sanchez, Robert O.

126

30 CFR 75.812 - Movement of high-voltage power centers and portable transformers; permit.  

Science.gov (United States)

...of high-voltage power centers and portable transformers; permit. 75...of high-voltage power centers and portable transformers; permit. [Statutory Provisions] Power centers and portable transformers shall be...

2010-07-01

127

Control and stabilization system for streamer chamber high-voltage supply  

Energy Technology Data Exchange (ETDEWEB)

Control and stabilization system for the bipolar high-voltage supply of the RISK magnetic spectrometer streamer chamber is described. The high-voltage pulse shaping is realized in two stages: on the first one the Arkadiev-Marx bipolar high-voltage pulse generator shapes microsecond pulse with the amplitude of +-600 kV, while on the second stage the bipolar nanosecond pulse shaper assembled as the double line circuit shapes the pulse by time and amplitude. The system ensures repetition of the +-(5-30)kV high-voltage pulses with the 6 Hz frequency at the pulse amplitude stability of +-0.5% during 2000 h continuous operation. Minimum generator charging time constitutes 50 ms.

Vertogradov, L.S.; Grishkevich, Ya.V.; Lomtadze, T.A.; Tokmenin, V.V.; Fedorovich, Yu.; Shelkov, G.A. (Joint Inst. for Nuclear Research, Dubna (USSR))

128

Control and stabilization system for streamer chamber high-voltage supply  

International Nuclear Information System (INIS)

Control and stabilization system for the bipolar high-voltage supply of the RISK magnetic spectrometer streamer chamber is described. The high-voltage pulse shaping is realized in two stages: on the first one the Arkadiev-Marx bipolar high-voltage pulse generator shapes microsecond pulse with the amplitude of +-600 kV, while on the second stage the bipolar nanosecond pulse shaper assembled as the double line circuit shapes the pulse by time and amplitude. The system ensures repetition of the +-(5-30)kV high-voltage pulses with the 6 Hz frequency at the pulse amplitude stability of +-0.5% during 2000 h continuous operation. Minimum generator charging time constitutes 50 ms

129

Integration Testing of a Modular Discharge Supply for NASA's High Voltage Hall Accelerator Thruster  

Science.gov (United States)

NASA s In-Space Propulsion Technology Program is developing a high performance Hall thruster that can fulfill the needs of future Discovery-class missions. The result of this effort is the High Voltage Hall Accelerator thruster that can operate over a power range from 0.3 to 3.5 kW and a specific impulse from 1,000 to 2,800 sec, and process 300 kg of xenon propellant. Simultaneously, a 4.0 kW discharge power supply comprised of two parallel modules was developed. These power modules use an innovative three-phase resonant topology that can efficiently supply full power to the thruster at an output voltage range of 200 to 700 V at an input voltage range of 80 to 160 V. Efficiencies as high as 95.9 percent were measured during an integration test with the NASA103M.XL thruster. The accuracy of the master/slave current sharing circuit and various thruster ignition techniques were evaluated.

Pinero, Luis R.; Kamhawi, hani; Drummond, Geoff

2010-01-01

130

Environmental impacts of high voltage power lines and stations  

International Nuclear Information System (INIS)

Environmental pollution due to high voltage power lines and stations (over 400 kV) shows up in several ways: high frequency (radio and TV range) radio waves; sound pollution (noises); various direct and indirect effects on living beings; aestethic pollution. The indirect effects of electromagnetic field may result in inducing high electric potential to earth insulated objects as cars, shelters and farming equipment, fencing, etc. which on human touch lead to discharge currents which only disappear by interrupting the contact. At high currents, due to muscle contraction, the man often cannot release the touched object, hence serious or even lethal accidents may happen. In depth analysis of such phenomena is possible by separating the electric and magnetic field effects. We shall concentrate on the electric field since the magnetic field effects are much less significant. 6 refs

131

High voltage insulation of bushing for HTS power equipment  

Science.gov (United States)

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.

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

2012-12-01

132

High-Voltage, Low-Power BNC Feedthrough Terminator  

Science.gov (United States)

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.

Bearden, Douglas

2012-01-01

133

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

Science.gov (United States)

...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...

2010-07-01

134

Technological Aspects: High Voltage  

CERN Document Server

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.

Faircloth, D C

2013-01-01

135

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

Science.gov (United States)

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.

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

2014-10-01

136

High Power, High Voltage Electric Power System for Electric Propulsion  

Science.gov (United States)

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.

Aintablian, Harry; Kirkham, Harold; Timmerman, Paul

2006-01-01

137

Spatial and temporal instabilities in high voltage power devices  

Energy Technology Data Exchange (ETDEWEB)

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.

Milady, Saeed

2010-01-29

138

DYNAMICS OF HIGH-VOLTAGE PLASTIC-INSULATED POWER CABLE HEATING  

Directory of Open Access Journals (Sweden)

Full Text Available Results of power cable capacity computations for the voltage of 220 kV are analyzed. The work deals with developing a current rating computation system for high-voltage cross-linked polyethylene power cables.

V.M. Zolotaryov

2013-09-01

139

Direct control of large power series triodes with transistors for high voltage power source  

International Nuclear Information System (INIS)

The control of high voltage, large power output is often required in high frequency power sources for plasma experiments. For this purpose, power transmitter tubes such as triodes or tetrodes have been used as the series control tubes. However, in case of large power, the driving power for the series control tubes also becomes large, and it leads to the requirement of large space and high cost. In order to solve such problem, the driving with transistor circuits has been experimented. Transistor circuits permit large current, but have comparatively low withstand voltage. However, the problem of withstand voltage has been solved by employing multi-stage series connection. First, the transistor circuit used has been analyzed, and the testing circuit was produced for trial and tested. The selected transistors were 2SD520 of Darlington connection as the main transistor, and 2SC995 or FET 2SK96C as the prestage transistor. The power source of +250 V to -1400 V has been prepared. In general, such a circuit tends to cause parasitic oscillation (of several MHz). To prevent this oscillation, capacitors of approximately 1000 pF were connected in parallel with bleeder resistors. These capacities did not affect the response speed of the system. Since the transistor failures in such a system may cause load breakage, the circuit must be protected by employing current limiters such as fast blowing fuses and Zener diodes for the protection from surge voltage. In the practically applied circuit, the transistors 2SC995 were selected from the standpoint of reliability. This circuit has realized the required performance in the test, and has been used for controlling the power supply for ECH klystron. (Wakatsuki, Y.)

140

High voltage ignition of high pressure microwave powered UV light sources  

Energy Technology Data Exchange (ETDEWEB)

Industrial microwave powered (electrodeless) light sources have been limited to quiescent pressures of {approximately}300 Torr of buffer gas and metal-halide fills. The predominant reason for such restrictions has been the inability to microwave ignite the plasma due to the collisionality of higher pressure fills and/or the electronegativity of halide bulb chemistries. Commercially interesting bulb fills require electric fields for ionization that are often large multiples of the breakdown voltage for air. Many auxiliary ignition methods are evaluated for efficiency and practicality before the choice of a high-voltage system with a retractable external electrode. The scheme utilizes a high voltage pulse power supply and a novel field emission source. Acting together they create localized condition of pressure reduction and high free electron density. This allows the normal microwave fields to drive this small region into avalanche, ignite the bulb, and heat the plasma to its operating point (T{sub e} {approx} 0.5 eV). This process is currently being used in a new generation of lamps, which are using multi-atmospheric excimer laser chemistries and pressure and constituent enhanced metal-halide systems. At the present time, production prototypes produce over 900 W of radiation in a 30 nm band, centered at 308 nm. Similarly, these prototypes when loaded with metal-halide bulb fills produce over 1 kW of radiation in 30 nm wide bands, centered about the wavelength of interest.

Frank, J.D.; Cekic, M.; Wood, C.H. [Fusion U.V. Curing Systems Corp., Gaithersburg, MD (United States)

1997-12-31

 
 
 
 
141

Mathematical study of very high voltage power networks II: The AC Power Flow Problem  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper is the second of a series dedicated to the mathematical study of very high voltage power networks, based on an asymptotic analysis, in which the square root of one of the small parameters is the inverse of the reference voltage of the network. We call this scheme the very high voltage approximation. We show that the active and reactive parts of the limit problem are decoupled. We give an analytic expansion for the solution of the problem, and prove the convergence of two decoupled ...

Bonnans, J. Frederic

1995-01-01

142

Static reactive power compensators for high-voltage power systems. Final report  

Energy Technology Data Exchange (ETDEWEB)

A study conducted to summarize the role of static reactive power compensators for high voltage power system applications is described. This information should be useful to the utility system planning engineer in applying static var systems (SVS) to high voltage as (HVAC) systems. The static var system is defined as a form of reactive power compensator. The general need for reactive power compensation in HVAC systems is discussed, and the static var system is compared to other devices utilized to provide reactive power compensation. Examples are presented of applying SVS for specific functions, such as the prevention of voltage collapse. The operating principles of commercially available SVS's are discussed in detail. The perormance and active power loss characteristics of SVS types are compared.

1981-04-01

143

Optimal PowerFlow (OPF) Model with Unified AC-DC Load Flow and Optimal Commitmentfor an AC-catenary Railway Power Supply System (RPSS) fed by aHigh Voltage DC (HVDC) transmission line  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this paper an alternative railway power systems design based on an HVDC feeder is studied. The HVDC feeder is connected to the catenary by converters. Such an HVDC line is also appropriate for DC-fed railways and AC-fed railways working at public frequency. A unit commitment optimal power flow model has been developed and is applied on a test system. In this paper, the model is presented in detail. The model, in the form of an MINLP program, uses unified AC-DC power flow to minimize the en...

Abrahamsson, Lars; O?stlund, Stefan; So?der, Lennart

2012-01-01

144

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 and under an impedance of about 950. Several options are proposed to improve the performances obtained. (J.S.)

145

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

Energy Technology Data Exchange (ETDEWEB)

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.

N. Greenough, E. Fredd, S. DePasquale

2009-09-21

146

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

147

Review on partial discharge detection techniques related to high voltage power equipment using different sensors  

Science.gov (United States)

When operating an equipment or a power system at the high voltage, problems associated with partial discharge (PD) can be tracked down to electromagnetic emission, acoustic emission or chemical reactions such as the formation of ozone and nitrous oxide gases. The high voltage equipment and high voltage installation owners have come to terms with the need for conditions monitoring the process of PD in the equipments such as power transformers, gas insulated substations (GIS), and cable installations. This paper reviews the available PD detection methods (involving high voltage equipment) such as electrical detection, chemical detection, acoustic detection, and optical detection. Advantages and disadvantages of each method have been explored and compared. The review suggests that optical detection techniques provide many advantages in the consideration of accuracy and suitability for the applications when compared to other techniques.

Yaacob, M. M.; Alsaedi, M. A.; Rashed, J. R.; Dakhil, A. M.; Atyah, S. F.

2014-12-01

148

Review on partial discharge detection techniques related to high voltage power equipment using different sensors  

Science.gov (United States)

When operating an equipment or a power system at the high voltage, problems associated with partial discharge (PD) can be tracked down to electromagnetic emission, acoustic emission or chemical reactions such as the formation of ozone and nitrous oxide gases. The high voltage equipment and high voltage installation owners have come to terms with the need for conditions monitoring the process of PD in the equipments such as power transformers, gas insulated substations (GIS), and cable installations. This paper reviews the available PD detection methods (involving high voltage equipment) such as electrical detection, chemical detection, acoustic detection, and optical detection. Advantages and disadvantages of each method have been explored and compared. The review suggests that optical detection techniques provide many advantages in the consideration of accuracy and suitability for the applications when compared to other techniques.

Yaacob, M. M.; Alsaedi, M. A.; Rashed, J. R.; Dakhil, A. M.; Atyah, S. F.

2014-09-01

149

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

Directory of Open Access Journals (Sweden)

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.

Prechanon Kumkratug

2010-01-01

150

Evaluation of high-voltage, high-power, solid-state remote power controllers for amps  

Science.gov (United States)

The Electrical Power Branch at Marshall Space Flight Center has a Power System Development Facility where various power circuit breadboards are tested and evaluated. This project relates to the evaluation of a particular remote power controller (RPC) energizing high power loads. The Facility equipment permits the thorough testing and evaluation of high-voltage, high-power solid-state remote power controllers. The purpose is to evaluate a Type E, 30 Ampere, 200 V dc remote power controller. Three phases of the RPC evaluation are presented. The RPC is evaluated within a low-voltage, low-power circuit to check its operational capability. The RPC is then evaluated while performing switch/circuit breaker functions within a 200 V dc, 30 Ampere power circuit. The final effort of the project relates to the recommended procedures for installing these RPC's into the existing Autonomously Managed Power System (AMPS) breadboard/test facility at MSFC.

Callis, Charles P.

1987-11-01

151

Topics in high voltage pulsed power plasma devices and applications  

Science.gov (United States)

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.

Chen, Hao

152

High voltage co-axial cable in pulsed power system  

International Nuclear Information System (INIS)

The breakdown property of polyethylene-insulated cables is well-known for impulse, but has not been clarified by now for damped oscillatory wave like in the case of fast discharge circuit of the plasma pinch machine TPE-2. So we have carried out the breakdown tests of usual cables with both damped oscillatory wave and impulse, and obtained the dependence of insulation thickness on both waves. Using these results, we have designed and manufactured 80 kV cables and cable terminals for the pulsed power. This cable system is successfully used in the TPE-2 device. (author)

153

High Voltage Power Converter for Large Wind Turbine  

DEFF Research Database (Denmark)

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.

Sztykiel, Michal

2014-01-01

154

Mathematical study of very high voltage power networks I: The optimal DC power flow problem  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The optimal power flow problem consists in setting the voltage and power delivered at the nodes of an electrical network, in order to minimize the loss of power over the lines. This paper is the first of a series dedicated to the mathematical study of this problem, based on an asymptotic analysis, in which the small parameter is the inverse of the reference voltage of the network. We call this scheme the very high voltage approximation. Here we deal with the case of direct current. We obtain ...

Bonnans, J. Frederic

1994-01-01

155

Hybrid voltage divider used for high voltage pulsed power measurement  

International Nuclear Information System (INIS)

The principle and structure of a hybrid voltage divider are proposed and the calibration and experimental testing are carried out. The ideal response conditions of the divider are analyzed by using the simplified divider model, the attenuation characteristic of two-stage voltage dividing is discussed, and then an error control method is presented. Through load calibration, the pulsed voltage frequency response of the divider can be greater than 2.9 MHz with the largest pulse width of 40 ?s, the attenuation ratio (or the attenuation coefficient) of 2. 60 kV/V and the measurement error of less than 5%. The divider has the merits of low cost, easy fabrication, and being capable of ns-to ?s-level pulsed voltage measurement, and it can be applied to laboratory- scale pulsed power measurement. (authors)

156

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

DEFF Research Database (Denmark)

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.

Sztykiel, Michal

2011-01-01

157

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

Science.gov (United States)

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.

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

1992-01-01

158

Operational effects of a dc superconducting line on a high-voltage power system  

International Nuclear Information System (INIS)

A mathematical model for analyzing the steady-state behaviour of an ac conventional power system involving a dc superconducting transmission line is presented. A special load-flow program is developed for the analysis of the effects of a dc superconducting line on the operating characteristics of a high-voltage power system. Case studies are described and conclusions are reached with respect to the feasibility and effectiveness of using a dc superconducting line in a conventional ac system

159

A digital controlled negative high voltage power source for LINAC of HLS  

International Nuclear Information System (INIS)

This paper introduces the working principle of a 10-80 kV negative high voltage power source for the electronic gun of the 200 MeV LINAC of NSRL, especially how to realize the switch power, voltage/current sampling, feedback control and microcontroller module. The firmware design for the SOC microcontroller of ADuC8xx and the application software design for PC are also presented. (authors)

160

Impulse Tests for a Composite Solid Insulator for High Voltage Superconducting Power Applications  

International Nuclear Information System (INIS)

High voltage insulation in cryogenic environment is one of big issues for development of superconducting power application, such as superconducting fault current limiter, transformer, transmission cable, and so on. We had proposed a composite solid insulator composed of plastics and polymer insulation sheets for a use of high voltage superconducting power applications. It is well known that the G10 FRP keeps its mechanical strength at very low temperature and the PPLP is very good insulator adopted as insulations for superconducting transmission cables. The composition of these two materials will show very good electrical and mechanical properties adequate for the insulation components of superconducting power applications, such as bushing, insulation barrier, and even for a cryostat. Dielectric strengths of prepared samples were measured at the temperature of boiling point of liquid nitrogen at atmospheric pressure, which will be presented in this paper to show a usefulness of this technique.

 
 
 
 
161

Impulse Tests for a Composite Solid Insulator for High Voltage Superconducting Power Applications  

Energy Technology Data Exchange (ETDEWEB)

High voltage insulation in cryogenic environment is one of big issues for development of superconducting power application, such as superconducting fault current limiter, transformer, transmission cable, and so on. We had proposed a composite solid insulator composed of plastics and polymer insulation sheets for a use of high voltage superconducting power applications. It is well known that the G10 FRP keeps its mechanical strength at very low temperature and the PPLP is very good insulator adopted as insulations for superconducting transmission cables. The composition of these two materials will show very good electrical and mechanical properties adequate for the insulation components of superconducting power applications, such as bushing, insulation barrier, and even for a cryostat. Dielectric strengths of prepared samples were measured at the temperature of boiling point of liquid nitrogen at atmospheric pressure, which will be presented in this paper to show a usefulness of this technique.

Kim, W. S.; Ryu, S. D.; Hyun, O. B.; Kim, H. R.; Yim, S. W.; Yang, S. E.; Kim, H. S. [KEPCO Research Institute, Daejeon (Korea, Republic of)

2011-08-15

162

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

163

A Study on Gas Insulation Characteristics for Design Optimization of High Voltage Power Apparatus  

Energy Technology Data Exchange (ETDEWEB)

This study aim of obtaining the basic data for gas insulation in the high voltage apparatus and for investigating the breakdown characteristics in uniform field and non-uniform which the geometric construction in the practical power apparatus. In this study, the research results on the insulation technology published earlier are reviewed and the basic data for an optimum design of a high voltage apparatus are obtained thorough the experiment and computer simulation by using a uniform field. The main result are summarized as follows: (A) Investigation on the insulation technology in a large-capacity power apparatus. (B) Investigation on the breakdown characteristics in particle contaminated condition. (C) Investigation on the design in computer simulation. (D) Investigation on the simulation technology of breakdown characteristics. (E) Investigation on breakdown characteristics in the nonuniform field and experiment. (author). refs., figs., tabs.

Kim, I. S.; Kim, M. K.; Seo, K. S.; Moon, I. W.; Choi, C. K. [Korea Electrotechnology Research Institute (Korea, Republic of)

1996-12-01

164

Test Results from a Simulated High Voltage Lunar Power Transmission Line  

Science.gov (United States)

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.

Birchenough, Arthur; Hervol, David

2008-01-01

165

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

Science.gov (United States)

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.

Birchenough, Arthur; Hervol, David

2008-01-01

166

Development and fabrication of a fast recovery, high voltage power diode  

Science.gov (United States)

The use of positive bevels for P-I-N mesa structures to achieve high voltages is described. The technique of glass passivation for mesa structures is described. The utilization of high energy radiation to control the lifetime of carriers in silicon is reported as a means to achieve fast recovery times. Characterization data is reported and is in agreement with design concepts developed for power diodes.

Berman, A. H.; Balodis, V.; Duffin, J. J.; Gaugh, C.; Kkaratnicki, H. M.; Troutman, G.

1981-01-01

167

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.

168

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

Science.gov (United States)

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. 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.

Rutberg, Ph G.; Popov, S. D.; Surov, A. V.; Serba, E. O.; Nakonechny, Gh V.; Spodobin, V. A.; Pavlov, A. V.; Surov, A. V.

2012-12-01

169

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

Science.gov (United States)

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.

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

1982-09-01

170

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

Science.gov (United States)

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.

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

1982-01-01

171

Teleprotection Terminal Interface for Analogue Communications over High Voltage Power Lines Implemented on FPGA  

Directory of Open Access Journals (Sweden)

Full Text Available The purpose of a telecommunication system in conjunction with protection systems is to transfer a protection signal in due time from the protection equipment to a similar equipment at the remote station. This paper describes an implementation of the interface in the teleprotection terminal dedicated to operate over Power Line Carrier (PLC links. Properties of the teleprotection terminal are briefly described, and in the sequel, the implementation of the line unit using FPGA technology is described in detail. The presented simulation model can be used to optimize the interface for suppressing noise effects that may appear in a communication channel realized over high voltage power line and PLC equipment.

V. V. ?elebi?

2013-06-01

172

High voltage solar cell power generating system for regulated solar array development  

Science.gov (United States)

A laboratory solar power system regulated by on-panel switches has been delivered for operating high power (3 kw), high voltage (15,000 volt) loads (communication tubes, ion thrusters). The modular system consists of 26 solar arrays, each with an integral light source and cooling system. A typical array contains 2560 series-connected cells. Each light source consists of twenty 500 watt tungsten iodide lamps providing plus or minus 5 per cent uniformity at one solar constant. An array temperature of less than 40 C is achieved using an infrared filter, a water cooled plate, a vacuum hold-down system, and air flushing.

Levy, E., Jr.; Hoffman, A. C.

1973-01-01

173

Power Supply for Piezoelectic Actuator  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This thesis presents a process of design, prototyping and testing of a power supply for high voltage piezoelectric actuator. And switch-mode converter topologies were examined while they provide better efficiency than their linear counter parts. The goal was to charge a piezoelectric stack from -200 V to 1000 V in under 0.5 ms. The most interesting topologies were simulated with SPICE-simulation software to gain knowledge and reference. A prototype device was designed and build in ord...

Vanhalakka, Juha

2014-01-01

174

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

Science.gov (United States)

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.

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

2014-05-01

175

Some problems relating to the transmission of electrical power at very high voltage  

Energy Technology Data Exchange (ETDEWEB)

Some of the technical and economic factors which influence the choice of a transmission system, particularly a very high voltage one, are discussed. The stability of transmission overvoltages at mains frequency and their control by means of compensating reactances is described. Overvoltages due to circuit-breaker operation and those of atmospheric origin, and appropriate protective devices, the behaviour of equipment at 750 kV, and problems of testing are included. Finally, the 735 kV network now being installed to carry 5300 MW of hydroelectric power 650 km from the Manicouagan River to Quebec and Montreal is described.

Goldstein, A.

1965-01-01

176

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

177

Surge protection of high voltage shunt capacitor banks on ac power systems  

International Nuclear Information System (INIS)

A survey of power utilities has been carried out to obtain data on high voltage shunt capacitor bank surge protection practices which presently exist. The questionnaire sought answers to questions relating to voltage rating, size of bank, number of banks, installation practices, switching arrangements and the application of surge arresters for over-voltage protection. In this paper a summary of the results of the survey is presented along with some general comments and conclusions on the findings. A brief outline of the basic application considerations, including lightning, switching, and temporary overvoltages is included

178

High voltage power lines in Italy: Quantitation of exposure and health risk evaluation  

International Nuclear Information System (INIS)

In Italy, as in most developed countries, a lively debate has been raised in the last years on possible long-term health effects of exposure to power frequency magnetic fields. Though the exposure is quite ubiquitous, due to the large presence of electric sources in any domestic, work, and urban environment, most of the concern regards fields generated by overhead high-voltage lines. Several epidemiological studies have in fact indicated an increase of cancer, in particular childhood leukaemia, within the population residing near power lines. The quantitative evaluation of the health risk associated with power lines is obviously of crucial importance, in particular for decision makers, in view of the future development of the electric network. Reliable data on the dimension of the health impact of power lines may in fact help in finding some consensus between the Authorities and the general public, and hopefully to overcome the present controversies

179

Power quality monitoring guideline for wind farms connected to extra high voltage grids  

Energy Technology Data Exchange (ETDEWEB)

The development of wind energy technologies has caused the capacity of wind farms to increase. There are already some large wind farms (WFs) connected directly to the extra high voltage (EHV) networks. Since most of the modern wind turbines are based on power electronic interfaces, the power quality (PQ) aspects with respect to transmission grids have become even more relevant. The goal of this paper is to propose a methodological approach for a PQ measurement - and analysis procedure for WFs, which are interconnected to the power networks at the EHV level, based on important existing standards. This work is necessary because currently no comprehensive and standardized system of rules exists for this matter. Further, a measuring set-up and results from exemplary PQ measurements are presented and some conspicuous results are analyzed. (orig.)

Rabe, Steffen; Rudion, Krzystof; Styczynski, Zbigniew A. [Magdeburg Univ. (Germany); Sassnick, Yvonne; Wilhelm, Matthias [50Hertz Transmission GmbH, Berlin (Germany)

2011-07-01

180

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

CERN Document Server

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.

Aguglia, D

2014-01-01

 
 
 
 
181

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

Energy Technology Data Exchange (ETDEWEB)

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.

Frank Hoffmann, PhD; Aspinall, Rik

2012-12-10

182

Novel High-Voltage, High-Power Piezoelectric Transformer Developed and Demonstrated for Space Communications Applications  

Science.gov (United States)

Improvements in individual piezoelectric transformer (PT) performance and the combination of these PTs in a unique modular topology under a Phase I contract with the NASA Glenn Research Center have enabled for the first time the simultaneous achievement of both high voltage and high power at much higher levels than previously obtained with any PT. Feasibility was demonstrated by a prototype transformer (called a Tap-Soner), which is shown in the preceding photograph as part of a direct-current to direct-current (dc-dc) converter having two outputs rated at 1.5 kV/5 W and 4.5 kV/20 W. The power density of 3.5 W/cm3 is significantly lower than for magnetic transformers with the same voltage and power output. This development, which is being done under a Small Business Innovation Research (SBIR) contract by Face Electronics, LC (Norfolk, VA), is based on improvements in the materials and design of Face's basic patented Transoner-T3 PT, shown in the left in the following figure. The T3 PT is most simply described as a resonant multilayer transducer where electrical energy at the input section is efficiently mechanically coupled to the output section, which then vibrates in a fundamental longitudinal mode to generate a high gain in voltage. The piezoelectric material used is a modified lead-zirconium-titanate-based ceramic. One of the significant improvements in PT design was the incorporation of a symmetrical double input layer, shown on the right in the following figure, which eliminated the lossy bending vibration modes characteristic of a single input layer. The performance of the improved PT was optimized to 1.5 kV/5 W. The next step was devising a way to combine the individual PTs in a modular circuit topology needed to achieve the desired high voltage and power output. Since the optimum performance of the individual PT occurs at resonance, the most efficient operation of the modular transformer was achieved by using a separate drive circuit for each PT. The output section consists of a separate output rectifier for each PT connected in series.

Carazo, Alfredo V.; Wintucky, Edwin G.

2004-01-01

183

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

Directory of Open Access Journals (Sweden)

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.

M. Mokhtar

2010-01-01

184

Highly efficient shielding of high-voltage underground power lines by pure iron screens  

International Nuclear Information System (INIS)

Metallic shielding structures are often adopted to mitigate the magnetic fields generated by high-power high-voltage underground power lines. Their design calls for the assessment of the combined influence of their geometrical parameters and the properties of the employed materials. In this paper, we present the study of pure iron shielding of a three-phase power line and the related efficiency. A finite element-boundary element (FE-BE) method is applied to describe the electromagnetic behavior of the cable-enwrapping shield. This is modeled as an indefinitely long cylinder of hexagonal cross-section, obtained by longitudinal juxtaposition of two doubly bent laminations, their thickness ranging between 1 and 10 mm. The magnetic properties of the involved pure iron laminations have been experimentally obtained under three different conditions: as-received, after localized plastic deformation, after stress-relief annealing. A low-carbon steel lamination has also been considered, whose harder magnetic behavior is predicted to lead to inferior shielding properties. The strong increase of iron permeability obtained upon annealing is conducive to improved shielding effectiveness in thin lamination screens, the advantage of the related magnetic softening becoming irrelevant for sheet thickness larger than about 4 mm. Tests performed on a 42 m long archetype three-phase line, endowed with a 4 mm thick annealed pure iron shield, provide figures for the shielding effectiveness e figures for the shielding effectiveness that are in close agreement with the FE-BE modeling prediction

185

To minimized power outage by the application of 'RTV' (room temperature vulcanizing) silicon on high voltage porcelain insulators in Pakistan  

International Nuclear Information System (INIS)

In Pakistan power network comprises of 500KV, 220KV, 132KV, 66KV and 33KV transmission lines and 11KV power distribution systems. Number of insulators are used in connected units in the shape of strings with transmission line as per insulation requirements with proper design according to the various kinds of pollution stresses. The transmission lines are passing from or near polluted areas and very dusty plains of Punjab and Sindh provinces. Practices are being used in these transmission lines for removal of accumulated contamination of insulators by periodic cleaning twice a year or de-energized transmission lines. Even then discontinuation of supply takes place in the polluted areas in foggy weather. Special technique of using water repellent (Room Temperature Vulcanizing) silicone coating/paint has been introduced on high voltage disc Insulators to minimize the outage in power net work in Pakistan. Especially in high pollution areas near chemical factories and near brick kilns etc comparison study of coated and uncoated disc Insulators have been carried out by ESDD (Equal Salt Deposit Density) measurement in salt fog chamber. (author)

186

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

Science.gov (United States)

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.

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

2014-10-01

187

High Voltage Electrostatic Pendulum  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A pendulum powered by high voltage electricity is described. The pendulum consists of two conducting plates(thin foil) separated by copper rods and are insulated from each other. High voltage is applied to these plates through the connecting copper rods. Another stationary aluminum plate(thin foil) is placed in front of the pendulum such that it serves to attract the pendulum plates and makes electrical contact with them enabling charge transfer between the stationary plate ...

Baddi, Raju

2012-01-01

188

High voltage-high power components for large space power distribution systems  

Science.gov (United States)

Space power components including a family of bipolar power switching transistors, fast switching power diodes, heat pipe cooled high frequency transformers and inductors, high frequency conduction cooled transformers, high power-high frequency capacitors, remote power controllers and rotary power transfer devices were developed. Many of these components such as the power switching transistors, power diodes and the high frequency capacitor are commercially available. All the other components were developed to the prototype level. The dc/dc series resonant converters were built to the 25 kW level.

Renz, D. D.

1984-01-01

189

Power supply of a betatron injector  

International Nuclear Information System (INIS)

High-voltage pulse power supply of small-sized 8 MeV electron energy betatron injector is described. The supply is made on the basis of step-up pulse transformer with the accumulator total discharge. Voltage amplitude at the injector cathode reaches 100 kW at up to 5 A load current. Duration of voltage pulse of semisimesoidal form constitutes by basis 0.5 ?s. Dimensions of pilse transformer in combination with oil tank are equal to 150x140x150 mm, mass - 5.2 kg. Heating of the injector cathode, which is under high voltage conditions, is conducted using alternative voltage generator connected to primary coil of pulse transformer. Operation of power supply is considered

190

High Power Amplifier and Power Supply  

Science.gov (United States)

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.

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

2008-01-01

191

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)

192

Computer-aided analysis of power-electronic systems simulation of a high-voltage power converter  

International Nuclear Information System (INIS)

In the study of semiconductor devices, simulation methods play an important role in both the design of systems and the analysis of their operation. The authors describe a new and efficient computer-aided package program for general power-electronic systems. The main difficulty when taking into account non-linear elements, such as semiconductors, lies in determining the existence and the relations of the elementary sequences defined by the conduction or nonconduction of these components. The method does not require a priori knowledge of the state sequences of the semiconductor nor of the commutation instants, but only the circuit structure, its parameters and the commands to the controlled switches. The simulation program computes automatically both transient and steady-state waveforms for any circuit configuration. The simulation of a high-voltage power converter is presented, both for its steady-state and transient overload conditions. This 100 kV power converter (4 MW) will feed two klystrons in parallel

193

Preferred external power supplies  

International Nuclear Information System (INIS)

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).

194

Trim coil power supplies  

International Nuclear Information System (INIS)

The 18 trim coil power supplies have been constructed and are now in place in the K500 pit and pit mezzanine. Final wiring of the primary power and control power is proceeding along with installation of cooling water supplies. The supplies are expected to be ready for final testing into resistive loads at the beginning of June, 1985

195

Series Resonant ZCS-PFM DC-DC Power Converter with High-Frequency High-Voltage Transformer Link for High-Power Magnetron Drive  

Science.gov (United States)

This paper presents a single lossless inductive snubber-assisted ZCS-PFM series resonant DC-DC power converter with a high-frequency high-voltage transformer link for industrial-use high power magnetron drive. The current flowing through the active power switches rises gradually at a turned-on transient state with the aid of a single lossless snubber inductor, and ZCS turn-on commutation based on overlapping current can be achieved in wide range pulse frequency modulation control scheme. The high-frequency high-voltage transformer primary side resonant current always becomes continuous operation mode, by electromagnetic loose coupling design of the high-frequency high-voltage transformer and the magnetizing inductance of the high-frequency high-voltage transformer. As a result, this high-voltage power converter circuit for the magnetron is possible to achieve a complete zero current soft switching under a condition of the broad width gate voltage signals. Furthermore, this high-voltage DC-DC power converter circuit can regulate the output power from zero to full over audible frequency range because of two resonant frequency circuit design. Its operating performances are evaluated and discussed on the basis of the power loss analysis simulation and the experimental results from a practical point of view.

Ishitobi, Manabu; Myoi, Takeshi; Soshin, Koji; Hiraki, Eiji; Nakaoka, Mutsuo

196

Peak voltage clamped power supply  

International Nuclear Information System (INIS)

The cost and energy efficiency of a power supply are optimized in a semi-regulated circuit wherein regulation occurs only under a high voltage, low current condition when peak output voltage would otherwise exceed a maximum specified voltage. The circuit includes a full wave rectifier driving a modified pi filter. A transistor in series with the filter is biased by a resistor to normally operate in a fully saturated, low power dissipating mode. When the output voltage approaches the specified maximum, the breakdown voltage of a zener diode is exceeded, and the output voltage is clamped to the specified maximum through the zener diode and the base-emitter junction of the transistor

197

a High-Voltage Pulse Transformer for Explosive Pulsed-Power Devices  

Science.gov (United States)

It is often necessary to use a high-voltage pulse transformer for impedance matching an explosive generator to a higher impedance load. Also, a particular application may require high voltage rather than the high current which flux compressor generators (FCGs) normally deliver when driving suitable low impedance loads. We have designed and built air-core transformers with measured coupling coefficients in the range of 0.88 to 0.94, for use with FCGs. The turns ratio for these transformers vary from 10 to 40. We have used these transformers in FCG shots and have measured 250 kV and 250 kA on the secondary, simultaneously and without breakdown. So far, the FCG and not the transformer have limited the voltage. Experiments to determine a voltage limit are ongoing. Our design and results are presented.

Fortgang, C.; Erickson, A.; Goettee, J.

2004-11-01

198

High-voltage, high-power, solid-state remote power controllers for aerospace applications  

Science.gov (United States)

Two general types of remote power controller (RPC) that combine the functions of a circuit breaker and a switch were developed for use in direct-current (dc) aerospace systems. Power-switching devices used in these designs are the relatively new gate-turnoff thyristor (GTO) and poweer metal-oxide-semiconductor field-effect transistors (MOSFET). The various RPC's can switch dc voltages to 1200 V and currents to 100 A. Seven different units were constructed and subjected to comprehensive laboratory and thermal vacuum testing. Two of these were dual units that switch both positive and negative voltages simultaneously. The RPC's using MOSFET's have slow turnon and turnoff times to limit voltage spiking from high di/dt. The GTO's have much faster transition times. All RPC's have programmable overload tripout and microsecond tripout for large overloads. The basic circuits developed can be used to build switchgear limited only by the ratings of the switching device used.

Sturman, J. C.

1985-01-01

199

Design of high-voltage, high-power, solid state remote power controllers for aerospace applications  

Science.gov (United States)

Two general types of remote power controllers (RPC's), which combine the functions of a circuit breaker and a switch, were developed for use in dc aerospace systems. Power-switching devices used in the designs are the gate-turnoff thyristor (GTO) and MOSFET. The RPC's can switch dc voltages to 1200 V and currents to 1000 A. Seven different units were constructed and subjected to laboratory and thermal vacuum testing. Two of these were dual units that switch both positive and negative voltages simultaneously. The RPC's using MOSFET's have slow turnon and turnoff times which limit surge currents and voltage spiking from high di/dt. The GTO's have much faster transition times. All RPC's have programmable overload tripout proportional to I sq T and microsecond tripout for large overloads.

Sturman, J. C.

1985-05-01

200

Computation of EMI Fields Generated Due to Corona on High Voltage Over Head Power Transmission Lines  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Corona generated pulsed currents on high voltage transmission line conductors radiate electromagnetic fields, which, in turn, can interfere with communication systems, and radio as well as television receivers operating nearby. In this paper, the corona generated electromagnetic interference (EMI) field in dB at an observation point near the ground has been computed assuming the ground as a perfect conductor. It has been observed that the interference field starts abruptly at the corona incep...

Nayak, Sk; Thomas, Joy M.

2002-01-01

 
 
 
 
201

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Kroll, Me; Swanson, J.; Vincent, Tj; Draper, Gj

2010-01-01

202

Childhood cancer in relation to distance from high voltage power lines in England and Wales: a case-control study  

Digital Repository Infrastructure Vision for European Research (DRIVER)

OBJECTIVE: To determine whether there is an association between distance of home address at birth from high voltage power lines and the incidence of leukaemia and other cancers in children in England and Wales. DESIGN: Case-control study. SETTING: Cancer registry and National Grid records. SUBJECTS: Records of 29 081 children with cancer, including 9700 with leukaemia. Children were aged 0-14 years and born in England and Wales, 1962-95. Controls were individually matched for sex, approximate...

Draper, G.; Vincent, T.; Kroll, Me; Swanson, J.

2005-01-01

203

New medium instead of high voltage power systems by using high-temperature superconductivity; Neue Mittel, statt konventioneller Hochspannungsnetze durch Hochtemperatur-Supraleitung  

Energy Technology Data Exchange (ETDEWEB)

In recent years there was a large progress in developing high-temperature superconducting (HTS) wires and tapes for power applications and it seems that an industrial large scale manufacturing seems to start very soon. Superconducting power cables and fault current limiters have been developed successfully worldwide and several field tests of large scale prototypes underline that both application seem shortly before commercialization. The operation experience showed that all technical requirements are fulfilled and that a high reliability can be achieved. Due to their high energy density and their compactness HTS power equipment enables to set-up new and flexible power system structures and to implement innovative solutions. Especially, a combination of medium voltage HTS cables and superconducting fault current limiters seems highly attractive for future urban area power supply. Applications can be expected when high voltage cables and their respective substations are dismantled partly in downtown areas. With HTS technology new power system concepts with lower width and right of way of the power line can be achieved. A new study evaluates if and how far existing high voltage cables and substations can be replaced by a medium voltage HTS system consisting of a cable and a fault current limiter. The technical and economic feasibility has been investigated. The study contains the state-of-the-art of HTS cable technology, the design and operation parameters of medium voltage HTS cables, a description of the cooling system, aspects of availability and reliability as well as the description of the protection schemes in combination with a fault current limiter. Furthermore, measures for transport, laying and commissioning of the cable are shown and safety and environmental aspects are covered. This paper summarizes the major result of this study and concentrates on the conceptual design of the cable and the results of the economic feasibility study. It can be summarized today that HTS medium voltage cables are the only technical and economic alternative to prevent further high voltage cables in downtown areas and to dismantle high voltage substations. The future application of HTS cables depends very much on the further improvement of the price-performance ratio of HTS wires and tapes and the further optimization of the cable manufacturing and the cooling system cost. It can be expected that HTS technology still enables large progress in the future and that a considerable cost decrease can be achieved. (orig.)

Noe, Mathias [Karlsruher Institut fuer Technologie (KIT), Karlsruhe (Germany); Merschel, Frank [RWE Deutschland AG, Essen (Germany); Hofmann, Lutz [Hannover Univ. (Germany); Stemmle, Mark; Schmidt, Frank [Nexans Deutschland GmbH, Hannover (Germany); Bock, Joachim [Nexans SuperConductors GmbH, Huerth (Germany)

2011-07-01

204

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.)

205

High-voltage electron accelerators  

International Nuclear Information System (INIS)

Ways for improving technical and economic factors of high-voltage electron accelerators intended for radiation technology are discussed. It is shown that basic components effecting radiation energy costs are the following: depreciation, costs of routine repair, energy expenses and attendant payments. Outlined is an improvement program for the Aurora and the Electron type accelerators of up to 100 kW power having high-voltage generator connected with emitters by 750 kV high-voltage cable

206

Novel high-voltage power device based on self-adaptive interface charge  

International Nuclear Information System (INIS)

This paper presents a novel high-voltage lateral double diffused metal-oxide semiconductor (LDMOS) with self-adaptive interface charge (SAC) layer and its physical model of the vertical interface electric field. The SAC can be self-adaptive to collect high concentration dynamic inversion holes, which effectively enhance the electric field of dielectric buried layer (EI) and increase breakdown voltage (BV). The BV and EI of SAC LDMOS increase to 612 V and 600 V/?m from 204 V and 90.7 V/?m of the conventional silicon-on-insulator, respectively. Moreover, enhancement factors of ? which present the enhanced ability of interface charge on EI are defined and analysed. (condensed matter: electronic structure, electrical, magnetic, and optical properties)

207

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

Directory of Open Access Journals (Sweden)

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.

R.O. Brasil

1999-06-01

208

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

209

Proximity Effects of High Voltage Transmission Lines on Humans  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Recently new threats to humans are observed from electromagnetic radiation from various sources like mobile phones, transmission lines and many more. For providing continuous and uninterrupted supply of electric power to consumer's maintenance operation of high voltage power lines are often performed with systems energized or live. This is referred as Hot Line maintenance or live line maintenance in this paper authors are concentrating on effects due to high voltage transmission lines on pers...

Kulkarni, Girish; Gandhare, Dr W. Z.

2012-01-01

210

AC power supply systems  

International Nuclear Information System (INIS)

An ac power supply system includes a rectifier fed by a normal ac supply, and an inverter connected to the rectifier by a dc link, the inverter being effective to invert the dc output of the receiver at a required frequency to provide an ac output. A dc backup power supply of lower voltage than the normal dc output of the rectifier is connected across the dc link such that the ac output of the rectifier is derived from the backup supply if the voltage of the output of the inverter falls below that of the backup supply. The dc backup power may be derived from a backup ac supply. Use in pumping coolant in nuclear reactor is envisaged. (author)

211

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)

212

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

213

PMTs applied circuitry--optimum design of high voltage generator  

International Nuclear Information System (INIS)

This author introduces the result of a years approach on optimum design of low power high voltage generator that is preferred to use as an unit within the stable high voltage supplier to bias photomultipliers. The optimization is upon the comparison of the spike disturbing interference generating, limit of power transferred, transformer fabrication art, simplicity and key components supply between push-pull bi-direction drive and switch drive DC/DC converter type high voltage generator. Also a practice design under this policy is given as a sample. This approach is valuable as it would benefit the instrumentation widely

214

Powerful high-voltage generators for FELTRON, the electrostatic-accelerator FEL amplifier for TeV colliders  

Science.gov (United States)

One of the crucial issues of the new ?-wave source FELTRON is the high-voltage generator. FELTRON is a powerful electrostatic FEL providing ?-wave radiation at 20 GHz, with peak power of 200 MW, pulse length of 500 ns (derived in ten separate beams of 50 ns each) at a repetition rate of 1 kHz. This radiation power will feed the cavities of a high gradient linac for TeV colliders. The average power of the generator must be around 250 kW, at a voltage of 5 MV. A Cockroft-Walton having the "onion" configuration is presented. The features are compared with those of dynamitron and insulating core transformer generators. The operation principles and technological problems are discussed in view of pulsed FEL utilization.

Boscolo, I.; Giuliani, F.; Roche, M.

1992-07-01

215

High Voltage Electrostatic Pendulum  

CERN Document Server

A pendulum powered by high voltage electricity is described. The pendulum consists of two conducting plates(thin foil) separated by copper rods and are insulated from each other. High voltage is applied to these plates through the connecting copper rods. Another stationary aluminum plate(thin foil) is placed in front of the pendulum such that it serves to attract the pendulum plates and makes electrical contact with them enabling charge transfer between the stationary plate and the pendulum plates. The pendulum is powered by the energy stored in the capacitance between the stationary aluminum plate and the pendulum plate. Attempt has been made to obtain the time period of oscillations as a function of applied voltage and other parameters. The derived formula for the time period has been verified experimentally. This apparatus can be used to demonstrate electrical phenomena in general and in particular electrical energy stored in conductors of small dimensions.

Baddi, Raju

2012-01-01

216

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)

217

Design and construction of an electrochemical etching power supply  

International Nuclear Information System (INIS)

An original design for a high-voltage power supply for electrochemical etching of latent nuclear tracks is presented. The device is analysed in terms of each of its block components and its performance with and without loading. Some of the main advantages of the design, besides the electronic performance, are its portability and low power consumption. (author)

218

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.

219

Risk of temporary over-voltage and high-voltage fault-ride-through of large wind power plants  

Energy Technology Data Exchange (ETDEWEB)

Denmark has four large offshore wind power plants (WPP) directly connected to the transmission grid, at a voltage level above 100 kV. Commissioning of more offshore WPP is announced. At present, the Danish offshore WPP are grid-connected through long high voltage alternating current (HVAC) cables. As a result of disconnection, severe temporary over-voltages (TOV) in such long HVAC cables have been observed in a Danish offshore WPP. The share of HVAC cables in the Danish transmission system increases due to grid-connection of WPP as well as replacement of over-head lines (OHL) by HVAC cables. This paper presents the analysis of TOV in long HVAC cables initiated by disconnection of WPP, in comparison to configurations with synchronous-generator-based systems and OHL, and discusses needs on high-voltage fault-ride-through (HV-FRT) requirements for WPP. The work relates to the CIGRE Working Group C4.502 on ''Power system technical performance issues related to the application of long HVAC cables''. (orig.)

Akhmatov, Vladislav; Gellert, Bjarne C. [Energinet.dk, Fredericia (Denmark); McDermott, Thomas E. [MelTran, Inc., Pittsburgh, PA (United States); Wiechowski, Wojciech [WTW Power Solutions, Warsaw (Poland)

2010-07-01

220

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

Science.gov (United States)

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.

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

 
 
 
 
221

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

Science.gov (United States)

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.

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

1982-01-01

222

Automating power supply checkout  

International Nuclear Information System (INIS)

Power Supply checkout is a necessary, pre-beam, time-critical function. At odds are the desire to decrease the amount of time to perform the checkout while at the same time maximizing the number and types of checks that can be performed and analyzing the results quickly (in case any problems exist that must be addressed). Controls and Power Supply Group personnel have worked together to develop tools to accomplish these goals. Power Supply checkouts are now accomplished in a time-frame of hours rather than days, reducing the number of person-hours needed to accomplish the checkout and making the system available more quickly for beam development. The goal of the Collider-Accelerator Department (CAD) at Brookhaven National Laboratory is to provide experimenters with collisions of heavy-ions and polarized protons. The Relativistic Heavy-Ion Collider (RHIC) magnets are controlled by 100's of varying types of power supplies. There is a concentrated effort to perform routine maintenance on the supplies during shutdown periods. There is an effort at RHIC to streamline the time needed for system checkout in order to quickly arrive at a period of beam operations for RHIC. This time-critical period is when the checkout of the power supplies is performed as the RHIC ring becomes cold and the supplies are connected to their physical magnets. The checkout process is used to identify problems in voltage and current regulation by examining data signals related to each for problems in settling and regulation (ripple).

223

Investigation of some variants of power supplies for kicker magnets  

International Nuclear Information System (INIS)

A possibility for construction of power supply systems for kicker magnets (KM) of large accelerators (UNK, for example), not using the lonq line, technique has been considered. Electric circuit of KM power supply, the operation of a given front of current in KM during shorting the key K1 at the expense of discharge of a high-voltage capacitance storage (CS) with subsequent shorting of magnet circuit and additional low-voltage source using the key K2, has been suggested. An assembly of avalanche fine-base diodes is used as the key K2. Comparisons of the power supply source with other ones, based on the long line technique confirmed a considerable decrease of the level of charging voltage of high-voltage storages and the number of their elements. Overall dimensions of the power supply system are also reduced by several times

224

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

CERN Document Server

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...

Rosato, V; Gianese, G; Bologna, S

2009-01-01

225

High power pulse magnetic field power supply system  

International Nuclear Information System (INIS)

The magnetic field power supply system, control system and experiment results of the power supply of HL-2A device are presented. The total pulse capacity of this power supply is about 250 MVA. The released energy is 1300 MJ in one discharge pulse. The highest DC output voltage of these power supplies is 3510 V and the highest current is 45 kA. All these power supplies are operated in pulsed mode. The pulse duration is 5 s, and the period is 10 min. The main circuit of this power supply consists of flywheel generator set, thyristor convertor and silicon diode rectifier. Many key technologies such as output balance technology of 2 motor generators with diode rectifiers paralleled directly, current balance technology of paralleled rectifiers, constant-angle phase shift control technology which is adequate for dynamic change in large frequency range, all-turn-off detection of 6-phase rectifier with high current, advanced monitoring system and measurement of pulsed high voltage and high current are adopted in HL-2A power supply system. The experiment results show that the performance of power supplies can satisfied the requirement of experiment very well. (authors)

226

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

CERN Document Server

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.

Bastos, M C; Hammarquist, M

2011-01-01

227

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

CERN Document Server

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.

Bastos, M Cerqueira; Bergman, A

2010-01-01

228

Environmental compatibility of ENEL's high voltage power network: Electromagnetic field effects  

International Nuclear Information System (INIS)

In its investigation of environmental compatibility problems impacting the power transmission network of ENEL (the Italian National Electricity Board), this paper focuses on the effects of 50 Hz electric and magnetic fields. In particular, the paper cites documented cases of physical disturbances suffered by users of ENEL's power system and the follow-up investigations made by local health authorities and ENEL technicians. Relevant to these cases, recorded data obtained in on-site measurements of the electric and magnetic fields are reported. Comparisons of these data are made with the limiting values prescribed in current Italian health and safety normatives governing power transmission lines

229

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.

230

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.

2008-12-09

231

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)

232

High Voltage Generation for Physics Lab  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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).

Baddi, Raju

2012-01-01

233

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

234

Automating power supply checkout  

Energy Technology Data Exchange (ETDEWEB)

Power Supply checkout is a necessary, pre-beam, time-critical function. At odds are the desire to decrease the amount of time to perform the checkout while at the same time maximizing the number and types of checks that can be performed and analyzing the results quickly (in case any problems exist that must be addressed). Controls and Power Supply Group personnel have worked together to develop tools to accomplish these goals. Power Supply checkouts are now accomplished in a time-frame of hours rather than days, reducing the number of person-hours needed to accomplish the checkout and making the system available more quickly for beam development. The goal of the Collider-Accelerator Department (CAD) at Brookhaven National Laboratory is to provide experimenters with collisions of heavy-ions and polarized protons. The Relativistic Heavy-Ion Collider (RHIC) magnets are controlled by 100's of varying types of power supplies. There is a concentrated effort to perform routine maintenance on the supplies during shutdown periods. There is an effort at RHIC to streamline the time needed for system checkout in order to quickly arrive at a period of beam operations for RHIC. This time-critical period is when the checkout of the power supplies is performed as the RHIC ring becomes cold and the supplies are connected to their physical magnets. The checkout process is used to identify problems in voltage and current regulation by examining data signals related to each for problems in settling and regulation (ripple).

Laster, J.; Bruno, D.; D' Ottavio, T.; Drozd, J.; Marr, G.; Mi, C.

2011-03-28

235

AGS Fast spin resonance jump, magnets and power supplies  

Energy Technology Data Exchange (ETDEWEB)

In order to cross more rapidly the 82 weak spin resonances caused by the horizontal tune and the partial snakes, we plan to jump the horizontal tune 82 times during the acceleration of polarized protons. The current in the magnets creating this tune jump will rise in 100 {micro}s, hold flat for about 4 ms and fan to zero in 100 {micro}s. Laminated beam transport quadrupole magnets have been recycled by installing new two turn coils and longitudinal laminated pole tip shims that reduce inductance and power supply current. The power supply uses a high voltage capacitor discharge to raise the magnet current, which is then switched to a low voltage supply, and then the current is switched back to the high voltage capacitor to zero the current. The current in each of the magnet pulses must match the order of magnitude change in proton momentum during the acceleration cycle. The magnet, power supply and operational experience are described.

Glenn,J.W.; Huang, H.; Liaw, C. J.; Marneris, I.; Meng, W.; Mi, J. L.; Rosas, P.; Sandberg, J.; Tuozzolo, J.; Zhang, A.

2009-05-04

236

Observations and modeling of GIC in the Chinese large-scale high-voltage power networks  

Directory of Open Access Journals (Sweden)

Full Text Available During geomagnetic storms, the geomagnetically induced currents (GIC cause bias fluxes in transformers, resulting in half-cycle saturation. Severely distorted exciting currents, which contain significant amounts of harmonics, threaten the safe operation of equipment and even the whole power system. In this paper, we compare GIC data measured in transformer neutrals and magnetic recordings in China, and show that the GIC amplitudes can be quite large even in mid-low latitude areas. The GIC in the Chinese Northwest 750 kV Power Grid are modeled based on the plane wave assumption. The results show that GIC flowing in some transformers exceed 30 A/phase during strong geomagnetic storms. GIC are thus not only a high-latitude problem but networks in middle and low latitudes can be impacted as well, which needs careful attention.

Liu Chunming

2014-01-01

237

High-voltage power transmission lines, mobile telephones and public health; Hoogspanningslijnen, mobiele telefonie en gezondheid  

Energy Technology Data Exchange (ETDEWEB)

In many countries there is great concern about possible adverse health effects from exposure to non-ionising radiations such as those emitted by high tension power lines and mobile phone base-station antennas and handsets. A brief review is given of the present day knowledge. It appears that extreme low frequency fields as generated by power lines, and radiofrequency fields (microwaves), as generated by mobile phones, may indeed have biological effects. However, there remains a lot of discussion between scientists about the harmful effects of these fields under `normal` exposure conditions. Most investigations fail for example to demonstrate a relationship between exposure to these electromagnetic fields and genetic effects or cancer. Yet, some publications are alarming. Therefore, further investigations are conducted and encouraged, for example by the world health organisation and other international bodies. 12 refs.

Verschaeve, L. [VITO, Milieutoxicologie, Boeretang (Netherlands)

1999-06-01

238

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

239

Solid oxide fuel cells with both high voltage and power output by utilizing beneficial interfacial reaction.  

Science.gov (United States)

An intriguing cell concept by applying proton-conducting oxide as the ionic conducting phase in the anode and taking advantage of beneficial interfacial reaction between anode and electrolyte is proposed to successfully achieve both high open circuit voltage (OCV) and power output for SOFCs with thin-film samarium doped ceria (SDC) electrolyte at temperatures higher than 600 °C. The fuel cells were fabricated by conventional route without introducing an additional processing step. A very thin and dense interfacial layer (2-3 ?m) with compositional gradient was created by in situ reaction between anode and electrolyte although the anode substrate had high surface roughness (>5 ?m), which is, however, beneficial for increasing triple phase boundaries where electrode reactions happen. A fuel cell with Ni-BaZr(0.4)Ce(0.4)Y(0.2)O(3) anode, thin-film SDC electrolyte and Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-?) (BSCF) cathode has an OCV as high as 1.022 V and delivered a power density of 462 mW cm(-2) at 0.7 V at 600 °C. It greatly promises an intriguing fuel cell concept for efficient power generation. PMID:22870505

Su, Chao; Shao, Zongping; Lin, Ye; Wu, Yuzhou; Wang, Huanting

2012-09-21

240

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

Science.gov (United States)

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.

Kraus, Robert; Myers, Ira; Baumann, Eric

1990-01-01

 
 
 
 
241

Programmable Multiple-Ramped-Voltage Power Supply  

Science.gov (United States)

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.

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

1993-01-01

242

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.)

243

Prospects for the development of high-voltage electron accelerators for power industry  

International Nuclear Information System (INIS)

An analysis is made of a modern accelerator electron beam 1 kwh cost. It is shown that a low level of capital expenditures and the fact of being highly economic is true for accelerators on the basis of one-phase transformers with the closed magnetic circuit powered from the industrial 50 Hz network with voltages 6 or 35 kV and with feeding the accelerating tube directly without intermediate gates. The economic efficiency of an accelerator complex consisting of 7 electron accelerators on the basis of one-phase accelerator has been discussed. The cost of 1 kwh for the electron beam is 0.9 copecks

244

Permanent partial discharge assessment of power station high-voltage switchgear  

Energy Technology Data Exchange (ETDEWEB)

Non-intrusive partial discharge monitoring has been installed on two 16kV switchboards at the Ffestiniog hydro-electric pumped storage power station. The circuit breakers control the generators/motors each operating about 3 times per day and therefore require a very high reliability and availability. The permanent monitoring is intended to provide warning of impending insulation failures and to assist with the management of the assets. The monitor has to be capable of detecting a partial discharge signal of sufficient level to signify possible failure occurring at any time at any of the monitored coupling devices. At the same time the monitor has to be able to discriminate against partial discharge activity from the generator/motors and the 275kV overhead lines. (author)

Brown, P.M. [EA Technology, Chester (United Kingdom); Jones, M.C. [Edison Mission Energy (First Hydro), Llanberis (United Kingdom)

2000-07-01

245

NASCAP modelling of high-voltage power system interactions with space charged-particle environments  

Science.gov (United States)

A simple space power system operating in geosynchronous orbit was analyzed. This system consisted of two solar array wings and a central body. Each solar array wing was considered to be divided into three regions operating at 2000 volts. The center body was considered to be an electrical ground with the array voltages both positive and negative relative to ground. The system was analyzed for both a normal environment and a moderate geomagnetic substorm environment. Initial results indicate a high probability of arcing at the interconnects on the negative operating voltage wing. The dielectric strength of the substrate may be exceeded giving rise to breakdown in the bulk of the material. The geomagnetic substorm did not seem to increase the electrical gradients at the interconnects on the negative operating voltage wing but did increase the gradients on the positive operating voltage wing which could result in increased coupling current losses.

Stevens, N. J.; Roche, J. C.; Mandell, M. J.

1979-01-01

246

Switching time control on power high voltage bipolar transistors for high definition VDT by electron irradiation  

International Nuclear Information System (INIS)

Transistors used as switches in horizontal deflection circuits for high definition TV and Video Display Terminals were subjected to electron irradiation using a 12 MeV linear accelerator. The use of electron irradiation has made possible a fine control of the charge carrier lifetime thus improving the switching time and greatly reducing the power losses at turn-on and turn-off. Devices able to work at horizontal deflection frequency from 32 kHz up to 64 kHz, 1.2-1.5 kV and to handle current between 2 and 10A have been obtained. The effects of the thermal processes, that the irradiated devices undergo during assembly and packaging operations, have been investigated. (author)

247

Switching time control on power high voltage bipolar transistors for high definition VDT by electron irradiation  

International Nuclear Information System (INIS)

Transistors used as switches in horizontal deflection circuits for high definition TV and Video Display Terminals were subjected to electron irradiation using a 12 MeV linear accelerator. The use of electron irradiation has made possible a fine control of the charge carrier lifetime thus improving the switching time and greatly reducing the power losses at turn-on and turn-off. Devices able to work at horizontal deflection frequency from 32 kHz up to 64 kHz, 1.2-1.5 kV and to handle current between 2 and 10A have been obtained. The effects of the thermal processes, that the irradiated devices undergo during assembly and packaging operation, have been investigated. (author)

248

On-chip High-Voltage Generator Design  

CERN Document Server

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.

Tanzawa, Toru

2013-01-01

249

Lightweight Regulated Power Supply  

Science.gov (United States)

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.

Mclyman, C. W.

1985-01-01

250

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

251

A look-up-table digital predistortion technique for high-voltage power amplifiers in ultrasonic applications.  

Science.gov (United States)

In this paper, we present a digital predistortion technique to improve the linearity and power efficiency of a high-voltage class-AB power amplifier (PA) for ultrasound transmitters. The system is composed of a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and a field-programmable gate array (FPGA) in which the digital predistortion (DPD) algorithm is implemented. The DPD algorithm updates the error, which is the difference between the ideal signal and the attenuated distorted output signal, in the look-up table (LUT) memory during each cycle of a sinusoidal signal using the least-mean-square (LMS) algorithm. On the next signal cycle, the error data are used to equalize the signal with negative harmonic components to cancel the amplifier's nonlinear response. The algorithm also includes a linear interpolation method applied to the windowed sinusoidal signals for the B-mode and Doppler modes. The measurement test bench uses an arbitrary function generator as the DAC to generate the input signal, an oscilloscope as the ADC to capture the output waveform, and software to implement the DPD algorithm. The measurement results show that the proposed system is able to reduce the second-order harmonic distortion (HD2) by 20 dB and the third-order harmonic distortion (HD3) by 14.5 dB, while at the same time improving the power efficiency by 18%. PMID:22828849

Gao, Zheng; Gui, Ping

2012-07-01

252

The current situation of diagnosis for insulation deterioration of high voltage induction motors in nuclear power plants  

International Nuclear Information System (INIS)

In order to evaluate aging effect on motor correctly, several data of high voltage induction motors in 17 nuclear power plants of Tokyo Electric Power Co. (TEPCO) have been collected since 1984. Collected data are non-destructive insulation diagnosis test data including insulation resistance, static capacitance and the results of insulation destructive test after replacement of motors. Evaluation based on the data shows that breakdown voltage (BDV) of motor coil has relationship with the motor parameters such as current increase ratio, maximum discharge magnitude, difference of dielectric dissipation factor, etc. From this viewpoint, BDV estimation formula for 6.6 kV motors is established by using multiple linear regression analysis method, considering parameter used in D-map evaluation. However the measured parameters may vary due to the factors besides insulation deterioration, not only the estimated BDV but also visual inspection data are took into account for overall diagnosis. Further collection of data and evaluation will be done continuously in order to enhance accuracy of the insulation diagnosis. The current situation of diagnosis for insulation deterioration of 6.6 kV class induction motors in nuclear power plants is described in this technical note. Also current situation of investigation on 3.3 kV class motors is described. (author)

253

Analyzing and correcting for contaminating magnetic fields at the Brorfelde geomagnetic observatory due to high-voltage DC power lines  

DEFF Research Database (Denmark)

The magnetic field observations made at the geomagnetic observatory Brorfelde (BFE), Denmark, are subject to disturbances of several nT caused by two single wire high-voltage DC power lines connecting Scandinavia with Central Europe. We have analysed how the magnetic disturbances relate to the currents in the power lines and found a linear relationship. Using linear regression on carefully selected parts of the available data series we have determined the factors of proportionality. Based on the simple relationship between the currents in the power lines and the observed magnetic disturbances, we have derived a method to correct the observatory data for a significant part of the disturbances. In addition we have investigated the influence of the disturbances on the determination of the K-index of the observatory. We found that the K-index based on the original disturbed data compared to the K-indices calculated from corrected data was different in 4 % of the 3-hour intervals for the investigated period.

Maule, C. F.; Thejll, P.

2009-01-01

254

Main magnet power supply  

International Nuclear Information System (INIS)

The K500 main magnet power supply system has been completed and successfully tested into resistive dummy loads at full operating current. The tests centered on overall functionality of the system since such things as current ripple, current ramping, and stability can only be tested when using the main magnet coils as the load. Controller functions that set the magnet currents and ramp/discharge rate worked well and allow currents and voltages to be entered with a resolution of about 8 mA and 0.2 V respectively. When regulating at the full load current of 800 amps, both the SCR supplies and the power FET passbanks remained well below their maximum safe operating temperatures. In fact, because so little power, between 400-700 watts, is being dissipated in the passbanks during regulation there is no noticeable temperature rise. When the magnet becomes available tests of the long term stability and regulation will be conducted

255

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.

256

K500 RF power supply  

International Nuclear Information System (INIS)

The K500 RF power supply and interlock system was completed and successfully tested into a dummy load at an output of 20 KVDC at 20 amps in January, 1985. The RF power supply, located in the north end of the old high bay area, consists of one common anode supply with three decoupled outputs, three separate screen grid power supplies and three separate control grid power supplies

257

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

258

Hold-up power supply for flash memory  

Science.gov (United States)

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.

Ott, William E. (Inventor)

2004-01-01

259

Advanced Accessory Power Supply Topologies  

Energy Technology Data Exchange (ETDEWEB)

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.

Marlino, L.D.

2010-06-15

260

Technique eliminates high voltage arcing at electrode-insulator contact area  

Science.gov (United States)

Coating the electrode-insulator contact area with silver epoxy conductive paint and forcing the electrode and insulator tightly together into a permanent connection, eliminates electrical arcing in high-voltage electrodes supplying electrical power to vacuum facilities.

Mealy, G.

1967-01-01

 
 
 
 
261

Switched mode power supplies  

International Nuclear Information System (INIS)

The power supply comprises an oscillator arranged to drive the primary winding of a transformer. A nuclear impulse detector is arranged to discontinue drive to the primary winding in response to detection of a nuclear impulse. The detector comprises a monostable circuit which has its state changed for a predetermined time by photocurrents induced in response to gamma radiation. In this changed state the detector disables the oscillator. (author)

262

Rechargeable power supply:  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The invention relates to a rechargeable power supply suitable to be used in a battery-operated device comprising at least one supercapacitor and at least a first and a second DC-DC converter connected in series, wherein the supercapacitor is connectable to an entry of the first DC-DC converter and the device is connectable to an exit of the second DC-DC converter.

Den Uijl, S.; Bouman, C.; Smit, W.

2006-01-01

263

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

264

Radiatively heated high voltage pyroelectric crystal pulser  

Energy Technology Data Exchange (ETDEWEB)

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.

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

265

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

266

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)

267

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

Science.gov (United States)

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.

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

2014-01-01

268

Rad-Hard, Miniaturized, Scalable, High-Voltage Switching Module for Power Applications Rad-Hard, Miniaturized  

Science.gov (United States)

A paper discusses the successful development of a miniaturized radiation hardened high-voltage switching module operating at 2.5 kV suitable for space application. The high-voltage architecture was designed, fabricated, and tested using a commercial process that uses a unique combination of 0.25 micrometer CMOS (complementary metal oxide semiconductor) transistors and high-voltage lateral DMOS (diffusion metal oxide semiconductor) device with high breakdown voltage (greater than 650 V). The high-voltage requirements are achieved by stacking a number of DMOS devices within one module, while two modules can be placed in series to achieve higher voltages. Besides the high-voltage requirements, a second generation prototype is currently being developed to provide improved switching capabilities (rise time and fall time for full range of target voltages and currents), the ability to scale the output voltage to a desired value with good accuracy (few percent) up to 10 kV, to cover a wide range of high-voltage applications. In addition, to ensure miniaturization, long life, and high reliability, the assemblies will require intensive high-voltage electrostatic modeling (optimized E-field distribution throughout the module) to complete the proposed packaging approach and test the applicability of using advanced materials in a space-like environment (temperature and pressure) to help prevent potential arcing and corona due to high field regions. Finally, a single-event effect evaluation would have to be performed and single-event mitigation methods implemented at the design and system level or developed to ensure complete radiation hardness of the module.

Adell, Philippe C.; Mojarradi, Mohammad; DelCastillo, Linda Y.; Vo, Tuan A.

2011-01-01

269

Dual voltage power supply with 48 volt  

Energy Technology Data Exchange (ETDEWEB)

Automotive electrics/electronics have just reached a period of tremendous change. High voltage systems for Hybrid, Plug-In Hybrid or Battery Electric Vehicles with high power electric motors, high energy accumulators and electric climate compressors will be introduced in order to achieve the challenging targets for CO{sub 2} emissions and energy efficiency and to anticipate the mobility of the future. Additionally, innovations and the continuous increase of functionality for comfort, safety, driver assistance and infotainment systems require more and more electrical power of the vehicle power supply at all. On the one hand side electrified vehicles will certainly achieve a significant market share, on the other hand side they will increase the pressure to conventional vehicles with combustion engines for fuel consumption and CO{sub 2} emissions. These vehicles will be enabled to keep their competitiveness by new functions and the optimization of their electric systems. A dual voltage power supply with 48 Volt and 12 Volt will be one of the key technologies to realize these requirements. The power capability of the existing 12 Volt power supply has reached its limits. Further potentials can only be admitted by the introduction of 48 Volt. For this reason the car manufacturers Audi, BMW, Daimler, Porsche and Volkswagen started very early on this item and developed a common specification of the new voltage range. Now, it is necessary to identify the probable systems at this voltage range and to start the developments. (orig.)

Froeschl, Joachim; Proebstle, Hartmut; Sirch, Ottmar [BMW Group, Muenchen (Germany)

2012-11-01

270

The IBA Rhodotron: an industrial high-voltage high-powered electron beam accelerator for polymers radiation processing  

International Nuclear Information System (INIS)

The Rhodotron is a high-voltage, high-power electron beam accelerator based on a design concept first proposed in 1989 by J. Pottier of the French Atomic Agency, Commissariat a l'Energie Atomique (CEA). In December 1991, the Belgian particle accelerator manufacturer, Ion Beam Applications s.a. (IBA) entered into an exclusive agreement with the CEA to develop and industrialize the Rhodotron. Electron beams have long been used as the preferential method to cross-link a variety of polymers, either in their bulk state or in their final form. Used extensively in the wire and cable industry to toughen insulating jackets, electron beam-treated plastics can demonstrate improved tensile and impact strength, greater abrasion resistance, increased temperature resistance and dramatically improved fire retardation. Electron beams are used to selectively cross-link or degrade a wide range of polymers in resin pellets form. Electron beams are also used for rapid curing of advanced composites, for cross-linking of floor-heating and sanitary pipes and for cross-linking of formed plastic parts. Other applications include: in-house and contract medical device sterilization, food irradiation in both electron and X-ray modes, pulp processing, electron beam doping of semi-conductors, gemstone coloration and general irradiation research. IBA currently markets three models of the Rhodotron, all capable of 10 MeV and alternate beam energies from 3 MeV upwards. The Rhodotron models TT100, TT20 upwards. The Rhodotron models TT100, TT200 and TT300 are typically specified with guaranteed beam powers of 35, 80 and 150 kW, respectively. Founded in 1986, IBA, a spin-off of the Cyclotron Research Center at the University of Louvain (UCL) in Belgium, is a pioneer in accelerator design for industrial-scale production

271

High-voltage test stand at Livermore  

International Nuclear Information System (INIS)

This paper describes the present design and future capability of the high-voltage test stand for neutral-beam sources at Lawrence Livermore Laboratory. The stand's immediate use will be for testing the full-scale sources (120 kV, 65 A) for the Tokamak Fusion Test Reactor. It will then be used to test parts of the sustaining source system (80 kV, 85 A) being designed for the Magnetic Fusion Test Facility. Following that will be an intensive effort to develop beams of up to 200 kV at 20 A by accelerating negative ions. The design of the test stand features a 5-MVA power supply feeding a vacuum tetrode that is used as a switch and regulator. The 500-kW arc supply and the 100-kW filament supply for the neutral-beam source are battery powered, thus eliminating one or two costly isolation transformers

272

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)

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.

Sulaeman, M. Y.; Widita, R.

2014-09-01

273

PROBLEMS OF ECONOMIC CRITERIA APPLICATION TO CALCULATION AND DESIGN OF HIGH-VOLTAGE PLASTIC-INSULATED POWER CABLES  

Directory of Open Access Journals (Sweden)

Full Text Available Results of cable transmitting capacity calculation for voltage of up to 220 kV are analyzed. The work is devoted to creation of a current rating calculation technique for high-voltage cross-linked polyethylene cables.

O.V. Golik

2013-09-01

274

Optimization Design for a High Voltage DC Power Supply Module Based on PSM Technology  

Science.gov (United States)

Pulse step modulator (PSM) topology is applied to the EAST auxiliary heating system, which consists of a neutral beam injection (NBI) and the related microwave heating system. This paper firstly analyzes the merits and demerits of the traditional PSM modules adopted by other international companies, and then optimizes the topology of the module using the analysis results. Finally, a new topology for the PSM module (a three-phase neutral-point diode-clamped rectifier) is proposed. This new module overcomes the problems of traditional modules and has better cost-effective performance. The experimental results verify that the new module is feasible for engineering applications.

Jiang, Li; Xu, Liuwei; Gao, Ge; Dong, Lin; Wang, Min

2014-04-01

275

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

276

Living near overhead high voltage transmission power lines as a risk factor for childhood acute lymphoblastic leukemia: a case-control study.  

Science.gov (United States)

This study aimed to investigate association of living near high voltage power lines with occurrence of childhood acute lymphoblastic leukemia (ALL). Through a case-control study 300 children aged 1-18 years with confirmed ALL were selected from all referral teaching centers for cancer. They interviewed for history of living near overhead high voltage power lines during at least past two years and compared with 300 controls which were individually matched for sex and approximate age. Logistic regression, chi square and paired t-tests were used for analysis when appropriate. The case group were living significantly closer to power lines (PKV, 10.78 (95%CI: 3.75 to 31) for 230 KV and 2.98 (95%CI: 0.93 to 9.54) for 400 KV lines. Odds of ALL decreased 0.61 for every 600 meters from the nearest power line. This study emphasizes that living close to high voltage power lines is a risk for ALL. PMID:20843128

Sohrabi, Mohammad-Reza; Tarjoman, Termeh; Abadi, Alireza; Yavari, Parvin

2010-01-01

277

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

DEFF Research Database (Denmark)

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.

Sharma, Ranjan

2012-01-01

278

Nuclear reactor power supply  

International Nuclear Information System (INIS)

The neutron absorbing medium in a reactor is changed in dependence upon the loading of the reactor, or any other operating mode where the power distribution axially is to be maintained within acceptable limits, by varying the chemical shim in the coolant of the reactor. The error for effecting the change is derived by comparing the average temperature of the coolant and a reference temperature which is a programmed function of the power delivered by the turbine energized by the reactor. The reference temperature is derived by converting the turbine impulse chamber pressure into a temperature parameter. A compensated temperature error is derived from an electrical compensating network typically a pid controller. At the input of this network an electrical analog of the temperature error is impressed and its output, a compensated temperature error, is derived. The correcting command is derived from the output of a non-linear gain network. At the input of this gain network the compensated temperature error is impressed. The output is supplied to a facility for changing the neutron-absorbing medium which is connected to the reactor. The compensating network and the gain network may be part of an analog logic system or part of a digital computer system

279

High-voltage engineering and testing  

CERN Document Server

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.

Ryan, Hugh M

2013-01-01

280

High-voltage DC-feeder solution for electric railways  

Digital Repository Infrastructure Vision for European Research (DRIVER)

For AC railway power supply systems with a different frequency than the public grid, high-voltage AC transmission lines are common, connected to the catenary by transformers. This study suggests an alternative design based on an high-voltage DC (HVDC)-feeder, which is connected to the catenary by converters. Such an HVDC line would also be appropriate for DC-fed railways and AC-fed railways working at a public-grid frequency. The converter stations between the public grid and the HVDCfeeder c...

Abrahamsson, Lars; Kjellqvist, Tommy; O?stlund, Stefan

2012-01-01

 
 
 
 
281

High-voltage low power analogue-to-digital conversion for adaptive architectures of capacitive vibration energy harvesters  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper presents a design and modeling of a block allowing converting a high voltage into a digital code which is used in a smart adaptive conditioning circuit to calibrate an electrostatic harvester for vibration energy. A smart energy management in the harvester is needed to achieve an optimal conversion of the vibration energy. This block is achieved with a successive approximation analogue-to-digital converter (SA ADC) and a voltage divider to reduce the voltage applied on the ADC. The...

Khalil, Raouf; Dudka, Andrii; Galayko, Dimitri; Basset, Philippe

2010-01-01

282

Reliability Estimates for Power Supplies  

International Nuclear Information System (INIS)

Failure rates for large power supplies at a fusion facility are critical knowledge needed to estimate availability of the facility or to set priorities for repairs and spare components. A study of the ''failure to operate on demand'' and ''failure to continue to operate'' failure rates has been performed for the large power supplies at DIII-D, which provide power to the magnet coils, the neutral beam injectors, the electron cyclotron heating systems, and the fast wave systems. When one of the power supplies fails to operate, the research program has to be either temporarily changed or halted. If one of the power supplies for the toroidal or ohmic heating coils fails, the operations have to be suspended or the research is continued at de-rated parameters until a repair is completed. If one of the power supplies used in the auxiliary plasma heating systems fails the research is often temporarily changed until a repair is completed. The power supplies are operated remotely and repairs are only performed when the power supplies are off line, so that failure of a power supply does not cause any risk to personnel. The DIII-D Trouble Report database was used to determine the number of power supply faults (over 1,700 reports), and tokamak annual operations data supplied the number of shots, operating times, and power supply usage for the DIII-D operating campaigns between mid-1987 and 2004. Where possible, these power supply failure rates from DIII-D will be compared to similates from DIII-D will be compared to similar work that has been performed for the Joint European Torus equipment. These independent data sets support validation of the fusion-specific failure rate values

283

Nuclear fusion power supply device  

International Nuclear Information System (INIS)

Object: To use a hybrid power supply device, which comprises a thyristor power supply and a diode power supply, to decrease cost of a nuclear fusion power supply device. Structure: The device comprises a thyristor power supply connected through a closing unit and a diode power supply connected in parallel through a breaker, input of each power supply being applied with an output voltage of a flywheel AC generator. When a current transformer is excited, a disconnecting switch is turned on to close the diode power supply and a current of the current transformer is increased by an automatic voltage regulator to a set value within a predetermined period of time. Next, the current is cut off by a breaker, and when the breaker is in on position, the disconnecting switch is opened to turn on the closing unit. Thus, when a plasma electric current reaches a predetermined value, the breaker is turned on, and the current of the current transformer is controlled by the thyristor power supply. (Kamimura, M.)

284

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

285

[Childhood leukaemia in a residential area with a high-voltage power line: approach according to the Dutch Community Health Services' guideline 'Cancer Clusters'].  

Science.gov (United States)

The new Dutch Community Health Services' (GGD) guideline titled 'Cancer Clusters' describes a phased plan for investigating reported cancer clusters. In each phase, attention is paid to both health and environmental issues and their possible links to one another. Throughout the entire cluster investigation, good risk communication is essential. In accordance with the new guideline, the Rotterdam-Rijnmond Public Health Services investigated the incidence of childhood leukaemia in a residential area as well as the data available on the high-voltage power line located there. More children in this residential area had been diagnosed with leukaemia than expected. However, the children had not been subjected to prolonged exposure to strong magnetic fields emitted from the high-voltage power line. With this type of cluster investigation, it is not possible to establish a causal relationship between childhood leukaemia and high-voltage power lines. However, the research did provide stakeholders insight into the health-and-environment situation and thereby, the opportunity to assess the situation appropriately and to act accordingly, if desired. PMID:23298726

Hegger, Carola; Reedijk, Ardine M J

2013-01-01

286

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)

287

Practical switching power supply design  

CERN Document Server

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

Brown, Martin C

1990-01-01

288

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

Science.gov (United States)

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 and stability, and it enables to construct stable, micrometer-thick, and contamination-free TNP patterns for developing the SS-DSSC array for miniature high-voltage applications. The array of 20 SS-DSSCs integrated in series is found to show a voltage output of around 7 V.

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

2013-11-01

289

Nuclear reactor power supply  

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 is interposed between the protection system and the control system. This selector prevents a parameter signal of a set of signals, which differs from the other parameters signals of the set by more than twice the allowable variation of the sensors which produce the set, from passing to the control system. The selectors include a pair of signal selection units, one unit sending selected process signals to primary control channels and the other sending selected process signals to back-up control channels. Test signals are periodically impressed by a test unit on a selected pair of a selected unit and control channels. When test signals are so impressed the selected control channel is disabled from transmitting control signals to the reactor and/or its associated components. reactor and/or its associated components. This arrangement eliminates the possibility that a single component failure which may be spurious will cause an inadvertent trip of the reactor during test

290

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

291

High-voltage engineering  

CERN Document Server

High-voltage engineering covers the application, the useful use and proper working of high voltages and high fields. Here we give some introductory examples, i.e., ‘septa’ and ‘kicker’ at the Large Hadron Collider (14 TeV), the Super Proton Synchrotron (450 GeV) and the Proton Synchrotron (26 GeV) accelerators as found at the European Orginization for Nuclear Research (CERN) today. We briefly cover the theoretical foundation (Maxwell equations) and aspects of numerical field simulation methods. Concepts relating to electrical fields, insulation geometry and medium and breakdown are introduced. We discuss ways of generating high voltages with examples of AC sources (50/60 Hz), DC sources, and pulse sources. Insulation and breakdown in gases, liquids, solids and vacuum are presented, including Paschen’s law (breakdown field and streamer breakdown). Applications of the above are discussed, in particular the general application of a transformer. We briefly discuss measurement techniques of partial disch...

Gaxiola, E

2006-01-01

292

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

Science.gov (United States)

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.

Béthoux, O.; Cathelin, J.

2010-12-01

293

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)

294

Risk spectrometer high-voltage system  

International Nuclear Information System (INIS)

The bipolar high-voltage pulse generator of the streamer chamber of the RISK spectrometer is described. The generator has the following characteristics: it provides a high voltage up to +-600 kV, supply voltage +-25 kV, charge capacity - 0.6 ?F, discharge capacity for each aron is 950 nF and an internal inductance - 1.8 ?H. The generator possesses a high stability and a reliability (more than 105 pulses)

295

High Voltage Distribution  

Science.gov (United States)

For detector arrays that require 5 to 10 kV at a few microamps each for hundreds of detectors, using hundreds of HV power supplies is unreasonable. Bundles of hundreds of HV cables take up space that should be filled with detectors. A typical HV module can supply 1 ma, enough current for hundreds of detectors. It is better to use a single HV module and distribute the current as needed. We show a circuit that, for each detector, measures the current, cuts off the voltage if the current exceeds a set maximum, and allows the HV to be turned on or off from a control computer. The entire array requires a single HV cable and 2 or 3 control lines. This design provides the same voltage to all of the detectors, the voltage set by the single HV module. Some additional circuitry would allow a computer controlled voltage drop between the HV and each individual detector.

Norbeck, Edwin; Miller, Michael; Onel, Yasar

2010-11-01

296

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 employed in the circuit design for complete isolation between low and high voltage sections. Theconstructed power supply was tested using a test load consisting of ten 100 W 250 V light bulbs with tungsten filamentsconnected in series. It was found that the power supply was capable of supplying either symmetric or asymmetric pulsed-dcpower of maximum peak-to-peak voltage of 1250 V. The negative and positive pulse widths were selectable between 10-100 ?s, with maximum pulse frequency of 30 kHz. This frequency limit is due to the limited speed of the power transistors used in the power switching circuit operating at high voltage. It is anticipated that the constructed power supply can be used as a plasma generator in a magnetron sputtering system for the deposition of oxide thin films such as Al2O3, NaxCo2O4, ITO and ZnO.

Vittaya Amornkitbamrung

2007-01-01

297

Power supply system for negative ion source at IPR  

Science.gov (United States)

The first step in the Indian program on negative ion beams is the setting up of Negative ion Experimental Assembly - RF based, where 100 kW of RF power shall be coupled to a plasma source producing plasma of density ~5 × 1012 cm-3, from which ~ 10 A of negative ion beam shall be produced and accelerated to 35 kV, through an electrostatic ion accelerator. The experimental system is modelled similar to the RF based negative ion source, BATMAN presently operating at IPP, Garching, Germany. The mechanical system for Negative Ion Source Assembly is close to the IPP source, remaining systems are designed and procured principally from indigenous sources, keeping the IPP configuration as a base line. High voltage (HV) and low voltage (LV) power supplies are two key constituents of the experimental setup. The HV power supplies for extraction and acceleration are rated for high voltage (~15 to 35kV), and high current (~ 15 to 35A). Other attributes are, fast rate of voltage rise (Cesium oven and the plasma grids; have attributes of low ripple, high stability, fast and precise regulation, programmability and remote operation. These power supplies are also equipped with over-voltage, over-current and current limit (CC Mode) protections. Fault diagnostics, to distinguish abnormal rise in currents (breakdown faults) with over-currents is enabled using fast response breakdown and over-current protection scheme. To restrict the fault energy deposited on the ion source, specially designed snubbers are implemented in each (extraction and acceleration) high voltage path to swap the surge energy. Moreover, the monitoring status and control signals from these power supplies are required to be electrically (~ 50kV) isolated from the system. The paper shall present the design basis, topology selection, manufacturing, testing, commissioning, integration and control strategy of these HVPS. A complete power interconnection scheme, which includes all protective devices and measuring devices, low & high voltage power supplies, monitoring and control signals etc. shall also be discussed. The paper also discusses the protocols involved in grounding and shielding, particularly in operating the system in RF environment.

Gahlaut, Agrajit; Sonara, Jashwant; Parmar, K. G.; Soni, Jignesh; Bandyopadhyay, M.; Singh, Mahendrajit; Bansal, Gourab; Pandya, Kaushal; Chakraborty, Arun

2010-02-01

298

A study of high voltage source application of fly back converter for x-ray tube  

International Nuclear Information System (INIS)

Full text: This research presents a study of design and construction of high voltage DC switching power supply for x-ray tube. The high voltage generating circuit is based on a fly back converter. The converter was designed to operate at 50 k Hz switching frequency through a high frequency fly back transformer. The circuit is capable of producing up to 65 kVDC by adapting the x-ray tube in small x-ray apparatus

299

Reactive power compensation in ITER power supply system  

International Nuclear Information System (INIS)

ITER power supply system supplies the heating and current driving facilities and the magnetic coils which will typically produce the reactive power up to 930Mvar in full load operation of 500MW active power. The high voltage grid allows about 200Mvar and the reactive power compensator (RPC) of 795Mvar is planned. The control strategy of RPC is important because of the over voltages from abrupt changes of the load. Some or whole units of the load could be cut off in normal operations as well as in accidents. ITER RPC consists of TCR (thyristor controlled reactor) and capacitors with fixed values. The control, in strategy, calculates the susceptance of the load from the load current and drives TCR to keep the total susceptance at the given level. The control circuit is simulated using a commercial software, PSIM, and the over voltages are tested for typical cases of load loses. In order to respond as fast as possible and thereby reduce the peak values of transient over voltages, a scheme is suggested in which the signals of the susceptance change and the timing are provided by the load controllers. The improvements are also simulated by PSIM

300

Electric power system / emergency power supply  

International Nuclear Information System (INIS)

One factor of reliability of reactor safety systems is the integrity of the power supply. The purpose of this paper is a review and a discussion of the safety objectives required for the planning, licensing, manufacture and erection of electrical power systems and components. The safety aspects and the technical background of the systems for - the electric auxiliary power supply system and - the emergency power supply system are outlined. These requirements result specially from the safety standards which are the framework for the studies of safety analysis. The overall and specific requirements for the electrical power supply of the safety systems are demonstrated on a 1300 MW standard nuclear power station with a pressurized water reactor. (orig.)

 
 
 
 
301

High voltage pulse conditioning  

Science.gov (United States)

Apparatus for conditioning high voltage pulses from particle accelerators in order to shorten the rise times of the pulses. Flashover switches in the cathode stalk of the transmission line hold off conduction for a determinable period of time, reflecting the early portion of the pulses. Diodes upstream of the switches divert energy into the magnetic and electrostatic storage of the capacitance and inductance inherent to the transmission line until the switches close.

Springfield, Ray M. (Sante Fe, NM); Wheat, Jr., Robert M. (Los Alamos, NM)

1990-01-01

302

High voltage pickup plate  

International Nuclear Information System (INIS)

For the 'electron gun' of the NIKHEF electron accelerator a High Voltage Pickup Plate (HVPP) has been constructed with belonging electronics, in order to iinvestigate the stability of the voltage of the electron gun. With the HVPP it is possible to measure the absolute quantities of the instabilities, as result of the rectifying and the pulsed load, of the ICT. (author). 28 figs.; 1 tab

303

High energy X-ray emission driven by high voltage circuit system  

Science.gov (United States)

The x-rays are produced by high voltage discharge applied inside plasma source interaction chamber; the control circuit system of high voltage is composed of a power supply and a LC-inverter. The goal of the project is based on the production of x-rays by a plasma to increase the efficiency of a classic x-ray tube with hot filament. Preliminary results of high energy x-rays emission, the layout and simulation with p-spice of the high voltage system are presented.

Emilio, M. Di Paolo; Palladino, L.

2014-04-01

304

Development of an IGBT converter for a magnet power supply  

International Nuclear Information System (INIS)

A 100-kW-class current-type PWM (pulse width modulation) converter based IGBTs (insulated-gate bipolar transistors) was developed, and the feasibility of its application to a large magnet power supply for nuclear fusion device was investigated. Although the target of the rated performance of 200 V-500 A was achieved, the following problems arose: transient high voltages of a LC filter, distortion of an AC source current for low output voltage operation, and decrease in power factor owing to large current operation. (author)

305

Determination of high voltage  

International Nuclear Information System (INIS)

The quality of an X-ray image is influenced by the radiation parameters (kV value, filtration) because of their impact on contrast and contrast resolution. Deviations from the nominal high voltage of an X-ray tube may lead to unnecessary exposure of the patient and complicate the comparability of X-ray images, which is why there is interest in an easy to handle, non-invasive method of determining the high voltage of an X-ray tube. For the purposes of constancy, several non-invasive high-voltage test tools have been developed, some of which work on the principle of modified film cassettes with two different intensifying screens or different optical extenuations, while others use a ''two filter method'' with photodiodes (electronic kV meters). The accuracy, reproducibility and practicality of two test cassettes and five electronic kV meters have been investigated and their usefulness with respect to national regulations and physicians' demands is discussed. (author)

306

A high-power high-voltage multi-pulse twin-output driver for radiation generators  

Energy Technology Data Exchange (ETDEWEB)

This paper presents the second phase of a research programme aimed at producing twin series of high-voltage pulses from the single discharge of a capacitor into multiple arrays of exploding metallic wires. Details of the design and construction of a generator that is able to produce either three 200 kV pulses, two 250 kV pulses or a single 500 kV pulse, on resistive loads between 50 and 100 {omega} at each output, are given. In addition to describing the design of the exploding wire arrays, the paper also details other ancillary equipment that is needed for the generator. This includes the two compact air-cored transformers that provide the twin series of output pulses at the required voltage. The experimental performance of the generator is shown to be close to that predicted by numerical modelling. Results are presented with the resistive loads replaced by x-ray heads, and ways by which the system can be further developed to drive microwave sources are discussed. (author)

Novac, B.M.; Smith, I.R. [Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire (United Kingdom)]. E-mail: i.r.smith@lboro.ac.uk; Brown, J. [Dstl, Fort Halstead, Sevenoaks, Kent (United Kingdom)

2001-12-21

307

A high-power high-voltage multi-pulse twin-output driver for radiation generators  

International Nuclear Information System (INIS)

This paper presents the second phase of a research programme aimed at producing twin series of high-voltage pulses from the single discharge of a capacitor into multiple arrays of exploding metallic wires. Details of the design and construction of a generator that is able to produce either three 200 kV pulses, two 250 kV pulses or a single 500 kV pulse, on resistive loads between 50 and 100 ? at each output, are given. In addition to describing the design of the exploding wire arrays, the paper also details other ancillary equipment that is needed for the generator. This includes the two compact air-cored transformers that provide the twin series of output pulses at the required voltage. The experimental performance of the generator is shown to be close to that predicted by numerical modelling. Results are presented with the resistive loads replaced by x-ray heads, and ways by which the system can be further developed to drive microwave sources are discussed. (author)

308

LHCb calorimeters high voltage system  

Science.gov (United States)

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.

Gilitsky, Yu.; Golutvin, A.; Konoplyannikov, A.; Lefrancois, J.; Perret, P.; Schopper, A.; Soldatov, M.; Yakimchuk, V.

2007-02-01

309

Design of the HL-2M power supply control system  

Energy Technology Data Exchange (ETDEWEB)

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.

Yao, Lieying, E-mail: yaoly@swip.ac.cn; Li, Weibin; Chen, Yuhong; Wang, Yingqiao; Bu, Mingnan; Wang, Yali; Hu, Haotian; Xuan, Weimin

2013-10-15

310

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

311

30 CFR 77.703 - Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems.  

Science.gov (United States)

...equipment receiving power from ungrounded delta systems. 77.703 Section...equipment receiving power from ungrounded delta systems. The frames of...equipment receiving power from ungrounded delta systems shall be grounded...

2010-07-01

312

30 CFR 75.704 - Grounding frames of stationary high-voltage equipment receiving power from ungrounded delta systems.  

Science.gov (United States)

...equipment receiving power from ungrounded delta systems. 75.704 Section...equipment receiving power from ungrounded delta systems. [Statutory Provisions...equipment receiving power from ungrounded delta systems shall be grounded...

2010-07-01

313

Applicability of Recovery Voltage and On-Line Partial Discharge Measurements for Condition Assessment of High Voltage Power Transformers.  

Science.gov (United States)

This thesis will focus on condition assessment methodologies of one of the most expensive electrical components: the power transformer. This power transformer fulfils an indispensable role in the AC power grid. Moreover, on the long term, this seems to be...

J. P. Van Bolhuis

2002-01-01

314

RICH High Voltages & PDF Analysis @ LHCb  

CERN Multimedia

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.

Fanchini, E

2009-01-01

315

40-kV, 25-ms neutral-beam power supply for TMX  

International Nuclear Information System (INIS)

Modifications are described to upgrade the neutral-beam power supply for the TMX from 40 kV, 10 ms to 40 kV, 25 ms. The redesign of the accel and suppressor power supplies to achieve separation of the high-voltage and control sections, operation of the arc pulse lines in series, operation of the arc pulse lines in a noisy environment with SCR trigger and crowbar, and modifications to the electrolytic storage banks are discussed

316

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 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)

317

Photodetector power supply system for the CMS hadron calorimeter  

Energy Technology Data Exchange (ETDEWEB)

The power supply system developed for the hybrid photodiodes used as photodetectors in the hadron calorimeter of the Compact Muon Solenoid (CMS) experiment at LHC in CERN is described. The system includes about 500 channels, with two different voltage outputs on each channel, one high-voltage output up to 14000 V and one bias-voltage output up to 200 V. All output voltages are floating to facilitate single-point ground configuration. The system is computer controlled and ready to be interconnected with the CMS slow-control facility.

Dimitrov, Lubomir [INRNE, Institute for Nuclear Research and Nuclear Energy, Blv. Tzarigradsko Shosse 72, Sofia 1784 (Bulgaria); Elias, John E. [FNAL (United States); Kunov, Boris [INRNE, Institute for Nuclear Research and Nuclear Energy, Blv. Tzarigradsko Shosse 72, Sofia 1784 (Bulgaria); Sergueev, Sergey [FNAL/JINR, Dubna (Russian Federation); Ronzhin, Anatoly [FNAL (United States); Vankov, Ivan [INRNE, Institute for Nuclear Research and Nuclear Energy, Blv. Tzarigradsko Shosse 72, Sofia 1784 (Bulgaria)]. E-mail: ivankov@inrne.bas.bg

2005-11-21

318

High voltage spacecraft electrical systems design  

Science.gov (United States)

Factors which must be considered when designing the best and the most cost-effective high-voltage electrical system for a spacecraft are discussed with particular attention given to the EMC considerations, high-voltage power bus, and harnesses. It is emphasized that the use of serial data buses and lines greatly simplify the harness design and weight. Careful attention to the grounding concept and the EMC requirements is necessary for insuring a 'quiet' spacecraft.

Stone, R. E.

1993-01-01

319

Design & Fabrication of a High-Voltage Photovoltaic Cell  

Energy Technology Data Exchange (ETDEWEB)

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.

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

2012-09-05

320

Magnetically switched power supply system for lasers  

Science.gov (United States)

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.

Pacala, Thomas J. (inventor)

1987-01-01

 
 
 
 
321

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)

322

A high-power switch-mode dc power supply for dynamic loads  

Energy Technology Data Exchange (ETDEWEB)

High-voltage dc power supplies are often required to operate with highly dynamic loads, such as arcs. A switch-mode dc power supply can offer significant advantages over conventional thyristor-based dc power supplies under such conditions. It can quickly turn off the supply to extinguish the arc, and it can quickly recover after the arc. It has a relatively small output filter capacitance, which results in small stored energy available to the arc. A 400-kW, 50-kV switch-mode dc power supply for an electron-beam gun that exploits these advantages was designed and tested. It uses four 100-kW, current-source-type dc-dc converters with inputs in parallel and outputs in series. The dc-dc converters operate at 20 kHz in the voltage regulator part and 10 kHz in the inverter, transformer, and output rectifier part of the circuit. Insulated gate bipolar transistors (IGBTs) are used as the power switches. Special techniques are used to protect the power supply and load against arcs and hard shorts. The power supply has an efficiency of 93%, an output voltage ripple of 1%, and fast dynamic response. In addition, it is nearly one-third the size of conventional power supplies.

Shimer, D.W.; Lange, A.C. [Lawrence Livermore National Lab., CA (United States); Bombay, J.N. [Kaiser Engineers, Oakland, CA (United States)

1994-06-23

323

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 a...

2010-01-01

324

Specialized device of power supplies  

Directory of Open Access Journals (Sweden)

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.

Gunchenko Y. A.

2010-02-01

325

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 operati...

Blank, Tobias; Thomas, Stephan; Roggendorf, Christoph; Pollok, Thomas; Trintis, Ionut; Sauer, Dirk Uwe

2010-01-01

326

Assembly of high voltage devices  

Energy Technology Data Exchange (ETDEWEB)

Electric utilities are required to provide high quality power delivery. ABB has developed a new type of switching device that combines a circuit breaker and one or more disconnectors and their control gears. These high voltage switchgear components are based either on air-insulated technology (AIS), or on gas-insulated technology (GIS) or a combination of both. The use of hybrid switchgear has enabled the development of simplified substations with many advantages, such as less space required due to GIS technology; higher flexibility of layout versus AIS; bus reconfiguration for increased system reliability and reduced outages; easier engineering; reduced maintenance and costs; easier integration of secondary systems; fast installation; and easy replacement in case of failure. The life cycle cost of the ABB hybrid modules has been evaluated on the basis of different network configuration scenarios, including indoor and outdoor installations. The International Electrotechnical Commission is preparing a new standard IEC 62271-205 to classify the combination of switching devices as assemblies of high voltage devices. 2 refs., 12 figs.

Cameroni, R.; Granata, C.; Calamari, L.; Gatti, P. [ABB PTPH U.O. ADDA, Lodi (Italy)

2008-07-01

327

Boeing's High Voltage Solar Tile Test Results  

Science.gov (United States)

Real concerns of spacecraft charging and experience with solar array augmented electrostatic discharge arcs on spacecraft have minimized the use of high voltages on large solar arrays despite numerous vehicle system mass and efficiency advantages. Boeing's solar tile (patent pending) allows high voltage to be generated at the array without the mass and efficiency losses of electronic conversion. Direct drive electric propulsion and higher power payloads (lower spacecraft weight) will benefit from this design. As future power demand grows, spacecraft designers must use higher voltage to minimize transmission loss and power cable mass for very large area arrays. This paper will describe the design and discuss the successful test of Boeing's 500-Volt Solar Tile in NASA Glenn's Tenney chamber in the Space Plasma Interaction Facility. The work was sponsored by NASA's Space Solar Power Exploratory Research and Technology (SERT) Program and will result in updated high voltage solar array design guidelines being published.

Reed, Brian J.; Harden, David E.; Ferguson, Dale C.; Snyder, David B.

2002-01-01

328

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

Science.gov (United States)

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.

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

2014-12-01

329

High voltage breakdown capabilities of high temperature insulation coatings for HTS and LTS conductors  

International Nuclear Information System (INIS)

High temperature ZrO2 based coatings were deposited on Ag and Ag/AgMg sheathed Bi-2212 tapes from solutions derived from alkoxide-based precursors using a reel-to-reel, continuous sol-gel technique. The insulation coatings were annealed at 850 deg. C for 20 hours under O2 flow. The surface morphology and structure of coatings were characterized by SEM and XRD. High voltage breakdown of insulation on tapes was measured by a standard high voltage breakdown power supply. It has been found that high voltage breakdown values of these insulations strongly depend on number of dipping, thickness, coating type, annealing conditions, and dopant content in ZrO2. 20% Y2O3-ZrO2 coatings showed the best high voltage breakdown value, 2.05 kV at 1.5 mA

330

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)

331

Principles and theory of resonance power supplies  

International Nuclear Information System (INIS)

The resonance power supply is widely used and proved to be an efficient method to supply accelerator magnets. The literature describes several power supply circuits but no comprehensive theory of operation is presented. This paper presents a mathematical method which describes the operation of the resonance power supply and it can be used for accurate design of components

332

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.

333

A parallel hybrid modular multilevel converter for high voltage DC applications  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Reliability and efficiency of power transmission has been at the forefront of research for some time and is currently being given critical consideration due to the increased dependence on electrical energy. With the increased demand for electricity, engineers are considering different methods of supply arrangement to improve the security of electricity supply. High Voltage Direct Current (HVDC) transmission is a technology that avails itself for distance power transmission, interconnection of...

Amankwah, Emmanuel K.

2013-01-01

334

PSQS – Power Supply Quality Simulator  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Kitron had wishes to be able to test and measure how disturbance affects their vehicle electronic units before they have been verified by SP Technical Research Institute of Sweden in Borås. This work started with the writing of a demand specification together with Kitron for a product PSQS, Power Supply Quality Simulator, which can generate some test pulses according to a standard for electronic units to Volvos vehicles. A design proposal was developed with the help the demand specification ...

Ahlstro?m, Johan; Nordstro?m, Edward

2008-01-01

335

High-Voltage, Asymmetric-Waveform Generator  

Science.gov (United States)

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).

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

2008-01-01

336

Fiber Optic High Voltage Probe  

Energy Technology Data Exchange (ETDEWEB)

We developed a fiber coupled sensor to measure High Voltage directly using only light as the probe. We use the Pockles effect in lithium niobate crystal which will induce a phase shift in a laser beam that varies according to applied voltage. This can then be transformed into a modulation of beam intensity by polarizers, interferometery, or waveguide coupling. No voltage dividers are necessary, nor is any physical connection. This is accompanied by taking advantage of the structure of the power system itself, using voltage planes and dielectric insulation already present as the capacitive voltage divider. We hypothesize a bandwidth from GHz to DC. Such a system could be used in any application that calls for isolated and unobtrusive voltage sensing.

Matthew J. Heino

1999-08-01

337

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

Energy Technology Data Exchange (ETDEWEB)

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 and Wells turbines to respectively capture wind energy and wave energy from marine wind and ocean wave. In addition to wind-turbine generators (WTGs) and wave-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. (author)

Wang, Li; Lee, Dong-Jing [Department of Electrical Engineering, National Cheng Kung University, Tainan city 701 (China); Lee, Wei-Jen [Department of Electrical Engineering, University of Texas at Arlington (UTA), Arlington, TX 76019 (United States); Chen, Zhe [Institute of Energy Technology (IET), Aalborg University, Analog (Denmark)

2008-12-01

338

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

DEFF Research Database (Denmark)

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

Wang, L.; Lee, D. J.

2008-01-01

339

Fermilab main ring power supply control programs  

Energy Technology Data Exchange (ETDEWEB)

The Fermilab Main Ring Power Supply System consists of 60 3-MW SCR power supplies controlled and regulated by two linked minicomputers. A description is given of the computer operation--the algorithms, programming techniques and timing.

Pfeffer, H.; Jong, D.

1977-01-01

340

Fermilab main ring power supply control programs  

International Nuclear Information System (INIS)

The Fermilab Main Ring Power Supply System consists of 60 3-MW SCR power supplies controlled and regulated by two linked minicomputers. A description is given of the computer operation--the algorithms, programming techniques and timing

 
 
 
 
341

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.)

342

Reactive power supply by distributed generators  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Braun, M.

2008-01-01

343

Power supply with nuclear reactor  

International Nuclear Information System (INIS)

Each parameter of the processes of the nuclear reactor and of the components of a power supply which convert the thermal energy generated by the reactor into electrical power is monitored by a set of four like sensors. One each of the unlike sensors which monitor the different parameters is contained in a reactor-trip logic channel. Each such unlike sensor is referred to here as a ''local sensor''. Each channel is interlocked with the other three channels and receives the signals sensed by the other three sensors, herein called ''remote sensors''. Each channel also includes means for processing the signals from the local and remote sensors. The apparatus also includes means for tripping the reactor to deenergize or trip the control rod drive and insert the control rods fully into the core so that the reactor stops supplying power. The apparatus normally operates on a ''two out of four'' configuration. This assumes that all sensors are in normal operating condition. To achieve this purpose, eight circuit breakers are provided. Two breaker contactors are controlled by each channel. The control is through the undervoltage relays of the respective breakers. To trip the reactor, it is necessary that at least four breaker contactors be opened by operation of two channels

344

Precision power supply control module  

International Nuclear Information System (INIS)

A temperature stabilized, digital input circuit module using surface mount technology has been developed for use as the precision control element in a 10 A bipolar trim magnet regulator. Regulators using this module have shown stability of 20 ppm over 8 hours. This circuit module combines the functions of a current measuring shunt, serial DAC, precision voltage reference, high gain error amplifier and readback buffer amplifier. Loop gain and compensation are done externally to the module. The module can be used in high current power supplies by replacing the internally derived current signal with the output signal from an external high current shunt or transductor

345

-1 MV DC UHV power supply for ITER NBI  

International Nuclear Information System (INIS)

A dc -1 MV ultra high voltage (UHV) power supply system is required for the ITER neutral beam injector (NBI) to accelerate negative ion beams up to the energy of 1 MeV with the beam current of 40 A for 3600 s. Domestic Agency of Japan (JADA) and Domestic Agency of EU (EUDA) have agreed the procurement sharing for the ITER NBI power supply system. JADA contributes procurement of dc -1 MV ultra-high voltage (UHV) components such as a -1 MV dc generator, a transmission line and a -1 MV insulating transformer. The dc UHV insulation is essential issue for the system, because dc long pulse insulation is different from conventional ac insulation. Voltage sharing is changed from capacitive distribution to resistive one by dc long pulse applying. Electric field distribution for multi-layer (oil/paper composites) insulation structure of the transformer has been studied by simulation for the long pulse operation up to 3600 s. The insulating structure has been designed and the overall dimensions of the dc UHV components have been finalized. In order to realize a stable NBI system, a surge energy suppression system is also essential to protect the accelerator from electric breakdowns. JADA contributes to provide an effective surge suppression system composed of a core snubber and resistors. Input energy from the power supply to the accelerator can be reduced to less than 20 joule which is smaller than design criteria of 50 joule at 1 MV breakdown. From these studies, JADA is ready for procurement arrangement for the UHV components. (author)

346

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

347

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. 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

348

Development of the 50 kV class high-voltage coaxial connector  

International Nuclear Information System (INIS)

We have developed a 50 kV class high-voltage coaxial cable connector. It was designed to feed high-power pulses from an inverter power supply to a modulator, and from a modulator to a klystron tank. The connector plug can be easily removed from the socket on the oil-filled tank, leaving the tank close. A spring contact wa used to make reliable connection. The voidless fiber reinforced plastic (FRP), which has excellent high-voltage characteristics, was introduced to the insulator bushing to avoid discharge problems. This high-voltage connector has been applied to the C-band modulator and the pulsed electron gun for the X-ray FEL project at SPring-8, and worked for more than 1 year without any troubles. (author)

349

Energy supply without nuclear power  

International Nuclear Information System (INIS)

In a first phase of work (1979-1980), the four energy paths were developed as an attempt to describe on a technical basis in quantitative terms, and combine in a consistent picture, the variety of opinions then prevailing in the Federal Republic with respect to future energy supply structures. The social compatibility of energy supply systems was the subject of investigation in the early eighties by two groups of scientists working on behalf, and following a suggestion, respectively, of the German Federal Ministry for Research and Technology, i.e., one group headed by K.M. Meyer-Abich and B. Schefold, and another group at the Juelich Nuclear Research Center. The final report by the Meyer-Abich/Schefold group, which was written for public release, is a book entitled 'Die Grenzen der Atomwirtschaft' (The Limits to the Nuclear Economy). This latter book came out in spring of 1986 and soon played a major role in the energy policy debate after the Chernobyl disaster. In their conclusions the authors clearly express themselves against using nuclear power on the grounds that it was a socially incompatible source of energy. This article compairs the energy scenarios K and S described in the book with the energy paths 2 and 3 of the Fact Finding Committee on Future Nuclear Energy Policy. (orig.)

350

Mechanical strength integrity for crowbarred power supplies  

International Nuclear Information System (INIS)

Crowbarring the output of a power supply serves to electrically protect the power supply's load. At the same time, however, the supply's windings are subjected to the electromagnetic forces of a partial short circuit. Because pulsed power supplies are frequently crowbarred as a normal part of the duty cycle, it is essential that their transformer windings be designed to repetitively withstand short circuit forces. If not provided for, crowbar or short circuit forces can irreparably damage the transformer's coils. These power supplies are intended for fusion applications. 2 refs

351

RISK spectrometer high-voltage system  

International Nuclear Information System (INIS)

The charging supply system for a bipolar pulse generator of the Arkadiev-Marx type is described. It is part of the high voltage system for the streamer chamber spectrometer RISK. The flowsheets and the time diagram are presented. The parameters of the system are: the voltage supplied can be held within the limits (5-30) kV, the output voltage is stable within the 0.5%, the minimum time of charging equals 50 ms. Possibilities of increasing speed of response of the system are considered

352

The future of electric power supply  

International Nuclear Information System (INIS)

In this interview with a prominent expert of the electric power industry, problems of assuring electricity supply, the economics of nuclear electricity generation, the supply structure, and cogeneration are discussed. (UA)

353

Compact Digital High Voltage Charger  

CERN Document Server

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.

Li, Ge

2005-01-01

354

A High Power RF Power Supply for High Energy Physics Applications  

CERN Document Server

Accelerators used for experiments in high-energy physics require very high power radio frequency sources to provide the energy needed to accelerate the particles. The RF power needs to be stable and predictable such that any variation in the supplied RF power has a limited and acceptable impact on the accelerated beam quality. The output load specifications for high voltage DC power systems are becoming increasingly more demanding. In addition, the impact of such systems on the electricity source is becoming more tightly regulated through power quality directives. These regulations set limits, for example, on the allowable individual harmonic current amplitudes and on "flicker" caused by transient load demands - the latter is particularly important for "long-pulse" modulators. The requirements above have to be met while still providing higher reliability to a higher specification at lower cost. A situation has now been reached where modulators based on existing approaches cannot meet these specifications and ...

Bland, Michael J; Przybyla, Jan; Wheeler, Pat

2005-01-01

355

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish 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. [...

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

2013-12-01

356

Bulk water distribution power supply failures  

Scientific Electronic Library Online (English)

Full Text Available SciELO South Africa | Language: English Abstract in english 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.

D T, Nel; J, Haarhoff.

2011-04-01

357

Solar power supply. Fundamentals, projecting, applications  

International Nuclear Information System (INIS)

After a general introduction, the following subjects are discussed: 1. Solar cells; 2. Solar power supply systems; 3. Components of autonomous solar power systems; 4. Projecting and dimensioning of autonomous solar power supply systems; 5. Grid-connected systems; 6. Installation, assembly, maintenance; 7. Cost and economic aspects; 8. Practical applications. (HW)

358

HIRFL-CSR power supply system  

Science.gov (United States)

There are more than 200 power supplies will be employed in CSR power supply system. These power supplies provide DC and pulsed exciting current for all magnets in main ring (CSRm), experiment ring (CSRe), injection line of CSRm and RIB line. Six small-scale prototypes have been designed and made before formal manufacture. One thyristor rectifier pulsed converter was delivered to Lanzhou in January and all measurement has been finished in April. The result is satisfied.

Gao, Daqing; Zhou, Zhongzu; Chen, Youxin; Wu, Rong; Shangguan, Jingbin; Bai, Zhen

2001-12-01

359

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

360

Studies on the behavior of multisecondary transformers used for regulated HV power supplies  

International Nuclear Information System (INIS)

Multisecondary transformers are used at the input stage of modular high voltage power supplies. These power supplies are used in various steady state and pulsed applications, typical examples are neutral beam injectors, rf and microwave devices [N. Tomljenovic et al., Solid power supplies for Gyrotron and NBI sources, Fusion Technol., 1992; H.-U. Boksberger et al., The solid state TEXTOR high voltage neutral beam accelerator power supplies, in: Proceedings of the 11th SOFE, Austin, 1985, p. 679]. This paper presents a systematic study of the interactions of the transformer secondary winding stray capacitances [S. Austen Stigant, The J and P Transformer Book, Butterworths, London, 10th ed., pp. 498-500] and their behavior on the switching frequency of the power supply. Results from simulation and experiments on a pair of 300 kV A, 415/330 V (20 secondaries), 30 kV dc isolation transformers used for generating a regulated 14 kV dc, 35 A output are presented. Additional dielectric losses ?13% of the total transformer loss and voltage swings at the switching frequency of the semiconductor devices are observed. Possible effects on the performance of the transformer and the design considerations are discussed. Constructional features and other observations related to the multisecondary transformers are also discussed

 
 
 
 
361

Electric power supply through the ages  

International Nuclear Information System (INIS)

Electric power supply, the backbone of our economy, can look back on a hundred years' history. Dr. G. Niehage reviews its development and the technical milestones reached. The present situation with its ultrahigh voltage transmission, interconnected network, power switches, and a wide spectrum of power plant types is reviewed. Niehage states that power supply can be assured for the future only if the development of nuclear power is speeded up. (orig.)

362

Engineering Design of the ITER AC/DC Power Supply System  

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; - Analysis of the changed designs of the AC/DC converters. - Setup of the PSIM model for the calculation of the junction temperature of the converter thyristors. - Finalize the converter's simulation modules and estimate the parallel number of an arm for each converter. - Fix the protection sequence and make a simulation. - Stability check of the power distribution system against the reactive power effect. - Design of small size hardware AC/DC converter. The results of these studies may used as one of references for practical designs of the power supplies and also used for developing Tokamak type fusion reactors in the future

363

Nuclear power and energy supply  

International Nuclear Information System (INIS)

German nuclear research centers have made important contributions in the fields of research, development and training and in this way helped to catch up with the lead of other countries in nuclear research and technology and to launch nuclear power as a new source of energy in the Federal Republic of Germany. Some years ago it appeared as if these objectives had all been fulfilled, and the question arose as to the justification of the continued existence of these nuclear research centers; at least a shift of their activities to non-nuclear sectors was demanded. However, in reality only a starting point hab been reached from which to develop advanced reactor systems and tackle new problems connected with a highly complex energy problem whose ramifications did not become apparent until a few years ago. In the long term phase of the energy problem there will be a gradual complete substitution of fossil fuels by other sources of energy, the continuity of supply being ensured first by fast breeder reactors and later on by nuclear fusion. The nuclear research centers will have to solve these problems in an increasingly closer cooperation and a division of labor among themselves and with industry. In the long run, most of their activities will continue to be in nuclear fields. (orig.)

364

A high voltage, constant current stimulator for electrocutaneous stimulation through small electrodes.  

Science.gov (United States)

A high-voltage stimulator has been designed to allow transcutaneous stimulation of tactile fibers of the fingertip. The stimulator's output stage was based upon an improved Howland current pump topology, modified to allow high load impedances and small currents. The compliance voltage of approximately 800 V is achieved using commercially available high-voltage operational amplifiers. The output current accuracy is better than +/- 5% over the range of 1 to 25 mA for 30 microseconds or longer pulses. The rise time for square pulses is less than 1 microsecond. High-voltage, common-mode, latch-up power supply problems and solutions are discussed. The stimulator's input stage is optically coupled to the controlling computer and complies with applicable safety standards for use in a hospital environment. The design presented here is for monophasic stimulation only, but could be modified for biphasic stimulation. PMID:10431457

Poletto, C J; Van Doren, C L

1999-08-01

365

Portable High Voltage Impulse Generator  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents a portable high voltage impulse generator which was designed and built with insulation up to 20 kV. This design was based on previous work in which simulation software for standard waves was developed. Commercial components and low-cost components were used in this work; however, these particular elements are not generally used for high voltage applications. The impulse generators used in industry and laboratories are usually expensive; they are built to withstand extra high voltage and they are big, making them impossible to transport. The proposed generator is portable, thereby allowing tests to be made on devices that cannot be moved from their location. The results obtained with the proposed impulse generator were satisfactory in terms of time and waveforms compared to other commercial impulse generators and the standard impulse wave simulator.

S. Gómez

2011-07-01

366

An accurate continuous calibration system for high voltage current transformer  

International Nuclear Information System (INIS)

A continuous calibration system for high voltage current transformers is presented in this paper. The sensor of this system is based on a kind of electronic instrument current transformer, which is a clamp-shape air core coil. This system uses an optical fiber transmission system for its signal transmission and power supply. Finally the digital integrator and fourth-order convolution window algorithm as error calculation methods are realized by the virtual instrument with a personal computer. It is found that this system can calibrate a high voltage current transformer while energized, which means avoiding a long calibrating period in the power system and the loss of power metering expense. At the same time, it has a wide dynamic range and frequency band, and it can achieve a high accuracy measurement in a complex electromagnetic field environment. The experimental results and the on-site operation results presented in the last part of the paper, prove that it can reach the 0.05 accuracy class and is easy to operate on site.

367

An accurate continuous calibration system for high voltage current transformer.  

Science.gov (United States)

A continuous calibration system for high voltage current transformers is presented in this paper. The sensor of this system is based on a kind of electronic instrument current transformer, which is a clamp-shape air core coil. This system uses an optical fiber transmission system for its signal transmission and power supply. Finally the digital integrator and fourth-order convolution window algorithm as error calculation methods are realized by the virtual instrument with a personal computer. It is found that this system can calibrate a high voltage current transformer while energized, which means avoiding a long calibrating period in the power system and the loss of power metering expense. At the same time, it has a wide dynamic range and frequency band, and it can achieve a high accuracy measurement in a complex electromagnetic field environment. The experimental results and the on-site operation results presented in the last part of the paper, prove that it can reach the 0.05 accuracy class and is easy to operate on site. PMID:21361633

Tong, Yue; Li, Bin Hong

2011-02-01

368

Dielectric barrier discharge driven by high voltage nanosecond pulse generator  

International Nuclear Information System (INIS)

Dielectric-barrier discharge is very perspective for new type of UV radiation source and a plasma-chemical reactor investigations. The power supply to this discharge in the form of nanosecond voltage pulses seems to be perspective for generation of a spatially uniform plasma with high average input power. Here the results of experiments on characteristics of dielectric-barrier discharge operated by high voltage nanosecond generator are presented. The experiments on barrier-discharge have been fulfilled with air, nitrogen, and helium gases. In our experiments on silent discharge operated by high voltage nanosecond pulses in large discharge tube (V = 2000 cm3) the input specific power up to 300 mW/cm3 has been achieved. The discharge is uniform within a wide pressure range and the gas volume is not contaminated with erosion products of discharge tube material. The obtained results allow us to consider dielectric-barrier discharge in this configuration to be very promising for further investigations with various gas mixtures. (authors)

369

Exploring the potential for new power supply  

International Nuclear Information System (INIS)

ure poses a restriction to market access. Sea Breeze Pacific Regional Transmission System Inc. has presented some solutions to address this problem. Two power transmission projects are currently under study. These include a 1050 MW transmission capacity project for the Strait of Juan de Fuca; and the Greater West Coast projects which will increase power transfer capacity to and from Vancouver Island via a submarine high voltage DC system that would enable stranded provincial energy resources to be exported to high value markets, bypassing existing congested interfaces with minimal losses. Policy issues affecting the development of renewable energy sources were discussed along with the need for utilities to embrace the integration of independent power producers.figs

370

Interruptions in own power supply, resulting to the losses of users power supply  

International Nuclear Information System (INIS)

Interruptions in internal NPP power supply and their effect on electricity users power supply were studied. A special model for calculation of this process which includes the requirements for reactor safety was developed

371

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

Energy Technology Data Exchange (ETDEWEB)

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.

Yellamraju, Sham Sunder Srinivas, E-mail: ysssrinivas@gmail.com [Institute for Plasma Research, BHAT, Gandhinagar 382428 (India); Kulkarni, Sanjay V. [Institute for Plasma Research, BHAT, Gandhinagar 382428 (India)

2013-10-15

372

Simplified design of switching power supplies  

CERN Document Server

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

Lenk, John

1996-01-01

373

Correction magnet power supplies for APS machine  

International Nuclear Information System (INIS)

The Advanced Photon Source machine requires a number of correction magnets; five kinds for the storage ring, two for the injector synchrotron, and two for the positron accumulator ring. Three types of bipolar power supply will be used for all the correction magnets. This paper describes the design aspects and considerations for correction magnet power supplies for the APS machine

374

NPP V-2 service load power supply  

International Nuclear Information System (INIS)

The objective of this paper is to make the participants familiar with conception design of the station service load power supplying, with way of power supply assurance for safety system loads of the Category I and II, which ensure reactor cooling down and to give the most important information on main electrical equipment. 3 figs

375

Efficiency Optimization by Considering the High Voltage Flyback Transformer Parasitics using an Automatic Winding Layout Technique  

DEFF Research Database (Denmark)

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 to 2.5 kV dc and vice versa, supplied from a 24 V dc 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 design and its impact on the total converter efficiency. The proposed efficiency optimization approach is experimentally verified on a 25 W ( average charging power) with 100 W (peak power) flyback dc-dc prototype. Index Terms—switched - mode power supply, high voltage dc - dc power converter, transformer design, optimization, energy efficiency, actuators, dielectric films

Thummala, Prasanth; Schneider, Henrik

2014-01-01

376

A NEW CONCEPTUAL DESIGN OF THE SNS FULL TURN FAST EXTRACTION KICKER POWER SUPPLY SYSTEM  

International Nuclear Information System (INIS)

The new conceptual design of full turn fast extraction kicker power supply system of the Spallation Neutron Source main ring will be presented in this paper. In this design, the extraction kicker power modulators will be located outside of the tunnel, as requested by the SNS Project. Its purpose is to minimize the components inside of the synchrotron tunnel. The high voltage modulator will use Blumlein pulser and hollow-anode thyratron structure, a parallel termination resistor and two transmission cables. Main advantages include: flexible system configuration for unipolar single drive or push-pull double drive of the kicker magnets, lower charging voltage, lower beam impedance, lower number of high voltage cables, and large design margin for implementation and future upgrade

377

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)

378

Maintenance management of emergency power supply equipment (uninterruptible power supply) in Tokai reprocessing plant  

International Nuclear Information System (INIS)

Uninterruptible power supply systems are installed in the Tokai reprocessing plant in preparation for the emergency case that the commercial power supply is stopped by an accidental or intentional interruption in the supply of electricity. The uninterruptible power supply system particularly provides a temporary power source to the important devices for the radiation control of nuclear critical monitoring in the plant. Thus, the system is potentially important and essential for nuclear plants. The paper reports the current activities such as regular inspections, replacement of parts and system update, to maintain the function of uninterruptible power supply systems. (author)

379

Estimation of power supply lifetime in NPP's environment  

International Nuclear Information System (INIS)

The I and C system used in nuclear power plant (NPP) power is supplied by numerous power supply (PS). Therefore, power supply is very important equipment for NPP's safety and reliability. In this paper, we estimate power supply lifetime, probability method (failure distribution analysis, Weibull) and the physical method (accelerated lifetime data, Telcordia III). In addition, we performed sensibility analysis for power supply lifetime

380

High voltage capacitor design and the determination of solid dielectric voltage breakdown  

International Nuclear Information System (INIS)

The value of the external field intensity serves as an electrical insulating material and is a physical characteristic of the substance. Capacitor discharge in the dielectric medium are experimentally investigated. The high voltage power supply and other instrument needed are briefly discussed. Capacitors with working voltage of 30.000 volt and the plastic being used for dielectrics in the capacitors are also discussed. (author)

 
 
 
 
381

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)

382

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

383

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.

384

Monitoring System for Uninterruptible Power Supply  

Directory of Open Access Journals (Sweden)

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.

S. A.Z. Murad

2007-01-01

385

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

Science.gov (United States)

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.

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

1995-01-01

386

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

Science.gov (United States)

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.

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

1995-05-23

387

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.)

388

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)

389

Design of ITER NBI power supply system  

Energy Technology Data Exchange (ETDEWEB)

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{mu}s. It was confirmed that the rise time, the ripple and the cut off speed is about 50 ms, 7% and <200{mu}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)

Watanabe, Kazuhiro; Ohara, Yoshihiro; Okumura, Yoshikazu [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment; Higa, Osamu; Kawashima, Syuichi; Ono, Youichi; Tanaka, Masanobu; Yasutomi, Sei

1997-07-01

390

Control units for APS power supplies  

International Nuclear Information System (INIS)

The Advanced Photon Source (APS) accelerator facility is made up of five major subsystems in addition to the linac: the positron accumulator ring (PAR), low energy transport (LET), booster synchrotron (SYNCH), high energy transport (HET), the storage ring (SR). Each subsystem has multiple magnet power supply combinations, some requiring multiple of operation. These magnet and power supply combinations computer controlled and monitored. The power supply control unit (PSCU) is the first layer of hardware and software above the power supply itself and is described in this paper. The description includes the basic philosophy for each of operation and how it influences the topology and of implementing control. The design of the analog reference blocks (ARBs) influenced the design of other custom functions well as the feedback controls for vibration and other dynamic corrections. The command set supported by the PSCU is discussed

391

High frequency, high voltage MOSFET isolation amplifier  

Science.gov (United States)

The present invention utilizes a high voltage isolation amplifier as the drive means for the inductor of a programmable microwave attenuator. A pair of power MOSFET devices are used to control the current flow through a magnetic yoke. The power MOSPET devices cooperate with floating operational amplifier drive circuits to act as a transconductance amplifiers and pass a load current according to command. The MOSFET isolation amplifier apparatus allows stable high frequency linear operation of MOSFET power stages and provides precise regulation of a load current through a magnetic yoke load. Variations of transfer characteristics and input parameters in the MOSFET power stages are corrected by use of a feedback signal which is generated in a current sense resistor by the load current. Such a power stage allows the implementation of isolation amplifiers which can provide high power high frequency linear regulation at elevated voltages and currents.

Jones

1986-06-01

392

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.

393

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

Energy Technology Data Exchange (ETDEWEB)

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.

Jeong, Hyun-Seok; Choi, Eun-Sun [Department of Chemical Engineering, Kangwon National University, Chuncheon, Kangwondo, 200-701 (Korea, Republic of); Kim, Jong Hun [Batteries R and D, LG Chem, Yusong-gu, Daejon, 305-380 (Korea, Republic of); Lee, Sang-Young, E-mail: syleek@kangwon.ac.kr [Department of Chemical Engineering, Kangwon National University, Chuncheon, Kangwondo, 200-701 (Korea, Republic of)

2011-05-30

394

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

395

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 the gun power supply, a radiation meter, a sensitive residual gas analyzer and surface x-ray spectrometer 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, the authors 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

396

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

397

BEPC II magnet power supply control system  

International Nuclear Information System (INIS)

Two rings will be constructed in the current tunnel to increase the luminosity of BEPC II. There will be approximately 460 magnet power supplies in the rings and transport line. Most magnet power supplies require 1 x 10-4 control precision and stability. Only the dipole power supply requires 5 x 10-5 control precision and stability. Using a PSC/PSI for the control of a high precision prototype PS, it has been proven that the PSI can meet the requirement of 5 x 10-5 precision and stability. For easy integration and maintenance, the authors decided to use the same hardware and software for the control of all PS in the rings and transport line. So, the control of all power supplies will be based on the PSC/PSI modules and the EPICS toolkits. This paper describes the application of the PSC/PSI for the BEPC II power supply control. The status of application software development and power supply control is discussed. (authors)

398

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.

399

New intelligent magnet power supplies for LAMPF  

Energy Technology Data Exchange (ETDEWEB)

New magnet power supplies are scheduled to be installed in the proton linac at the Clinton P. Anderson Meson Physics Facility (LAMPF). The control and interface design of these power supplies represents a departure from all others onsite. A high-level ASCII control protocol has been designed. The supplies have sophisticated microprocessor control onboard and communicate with the accelerator control system via RS-422 (serial communications). The low-level software used by the accelerator control system is currently being rewritten to accommodate these new devices. They will communicate with the control system through a terminal server port connected to the site-wide ethernet backbone. This means that each supply will, for all intents and purposes, be a network object. Details of the design strategies for the analog and digital control for these supplies as well as the control protocol interface will be presented. 5 refs., 5 figs., 1 tab.

Cohen, S.; Sturrock, J.

1991-01-01

400

New intelligent magnet power supplies for LAMPF  

International Nuclear Information System (INIS)

New magnet power supplies are scheduled to be installed in the proton linac at the Clinton P. Anderson Meson Physics Facility (LAMPF). The control and interface design of these power supplies represents a departure from all others onsite. A high-level ASCII control protocol has been designed. The supplies have sophisticated microprocessor control onboard and communicate with the accelerator control system via RS-422 (serial communications). The low-level software used by the accelerator control system is currently being rewritten to accommodate these new devices. They will communicate with the control system through a terminal server port connected to the site-wide ethernet backbone. This means that each supply will, for all intents and purposes, be a network object. Details of the design strategies for the analog and digital control for these supplies as well as the control protocol interface will be presented. 5 refs., 5 figs., 1 tab