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1

High voltage DC power supply  

Energy Technology Data Exchange (ETDEWEB)

A high voltage DC power supply having a first series resistor at the output for limiting current in the event of a short-circuited output, a second series resistor for sensing the magnitude of output current, and a voltage divider circuit for providing a source of feedback voltage for use in voltage regulation is disclosed. The voltage divider circuit is coupled to the second series resistor so as to compensate the feedback voltage for a voltage drop across the first series resistor. The power supply also includes a pulse-width modulated control circuit, having dual clock signals, which is responsive to both the feedback voltage and a command voltage, and also includes voltage and current measuring circuits responsive to the feedback voltage and the voltage developed across the second series resistor respectively. 7 figs.

Droege, T.F.

1989-12-19

2

High voltage DC power supply  

Energy Technology Data Exchange (ETDEWEB)

A high voltage DC power supply having a first series resistor at the output for limiting current in the event of a short-circuited output, a second series resistor for sensing the magnitude of output current, and a voltage divider circuit for providing a source of feedback voltage for use in voltage regulation is disclosed. The voltage divider circuit is coupled to the second series resistor so as to compensate the feedback voltage for a voltage drop across the first series resistor. The power supply also includes a pulse-width modulated control circuit, having dual clock signals, which is responsive to both the feedback voltage and a command voltage, and also includes voltage and current measuring circuits responsive to the feedback voltage and the voltage developed across the second series resistor respectively.

Droege, Thomas F. (Batavia, IL)

1989-01-01

3

High Voltage Power Supply for RPC detectors  

International Nuclear Information System (INIS)

A High Voltage Power Supply Unit (HVPSU) for biasing resistive plate chamber (RPC) detector has been developed for initial testing of the RPC prototypes. The unit, based on inexpensive encapsulated DC-DC converters, is capable of delivering positive and negative polarity independently adjustable high voltages to the detector. The HVPSU is overload protected and displays the output voltage and current loading in both channels. Test performance of the unit with a 300x300mm single gap RPC detector is reported.

2009-05-01

4

High-voltage power supply unit  

CERN Multimedia

A unit comprising four high-voltage power sources (HPS) is designed for power supply of four independent photomultipliers. Each HPS comprises a pulse-width modulator, digital-to-analog converter, base voltage source and digital interface. HPS unit supplies up to 2000 V output voltage, up to 2.5 mA current and long-term stability equal to +- 0.03%

Garipov, G K; Silaev, A A; Shirokov, A V

2002-01-01

5

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)

2005-03-01

6

Pulsed high voltage extraction power supply  

International Nuclear Information System (INIS)

The basic idea was to obtain a pulsed power supply up to 4 kV designated to extract the microwave from a usual magnetron. The magnetron used is a home appliance device from a microwave oven. The output power generally ranges from 200 to 800 watts, the power rate being controlled by a timer device. Practically the magnetron works at a constant filament voltage and a fixed extraction high voltage the last one being switched on/off on a pre-programmed scheme. The on/off time laps are ranging from tens seconds to few minutes. The magnetron used in our ECR ion source has a different way to furnish a lower microwave energy into the ionization chamber. The microwave energy required for the ECR ion source is much smaller ranging from 20 watts to a maximum of 100 watts. The volume of the chamber is very small and there are not possibilities for exhausting large amounts of heat. For this reason the high voltage is applied by means of a chopping device operating at 50 Hz frequency (the AC frequency). For a very few milliseconds the high voltage is turned on every period of the sinusoidal voltage. In this way the energy injected into the ion chamber is reduced to acceptable values. The only problem that occurs is the fact that this periodicity of microwave generation is found also into the extracted ion beam; the beam is obtained at a 50 Hz frequency in very intense thin pulses with a few milliseconds width. As we discussed in a previous paper we are mainly concerned with the 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)

2000-01-01

7

High voltage power supply development for INGA facility at IUAC  

International Nuclear Information System (INIS)

The upcoming INGA facility requires a large number of high voltage supplies to bias detectors. Two types of NIM based high voltage supplies have been developed with unique functional facilities, which makes the biasing of large arrays very comfortable (5 kV/50 uA programmable power supplies for Germanium Detectors and 3 kV/10 mA power supplies for BGO detectors). High power multioutput Preamplifier supplies have been developed for INGA facility

2007-12-11

8

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)

2006-11-01

9

Experimental study on output ripple of high voltage power supply  

International Nuclear Information System (INIS)

Utilizing digital oscilloscope as main measurement device, a new method to characterize the output ripple of high voltage power supply in time domain, statistic domain and frequency domain is proposed. The possible distortions and the alleviating approaches in spectra analysis are described. (authors)

2006-01-01

10

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.)

1979-01-01

11

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

1997-07-02

12

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)

1978-01-01

13

High-Voltage Power Supply System for Laser Isotope Separation  

Energy Technology Data Exchange (ETDEWEB)

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.

Ketaily, E.C.; Buckner, R.P.; Uhrik, R.L.

1979-06-26

14

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 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.

2009-06-01

15

High voltage power supply with modular series resonant inverters  

Energy Technology Data Exchange (ETDEWEB)

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

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

1995-01-01

16

High-voltage power supply system for an electrostatic deflector  

International Nuclear Information System (INIS)

A high-voltage supply system of an electrostatic deflector is described. The multiplying column composed of miniature diodes and capacitors is supplied from a thyristor converter and a step-up transformer with an open ferrite core. The stabilization system comprising two feedback rings made it possible to coincide deep smooth control of rectified voltage (10-100 kV) and its stabilization with an accuracy of 10-3

1979-01-01

17

Study of a High Voltage Ion Engine Power Supply  

Science.gov (United States)

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

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

1996-01-01

18

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)

2009-03-01

19

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.

20

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

International Nuclear Information System (INIS)

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

2007-08-16

 
 
 
 
21

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.)

1980-12-15

22

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

CERN Multimedia

The authors describe a remotely controlled power supply multichannel system delivering a current of 200 mu 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. (4 refs).

Bologna, G; Codino, A; D'Ettorre-Piazzoli, B; Fabbri, F L; Levy, G; Mannocchi, G; Picchi, P; Rivellini, G; Satta, L; Spillantini, P; Zallo, A

1980-01-01

23

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.

2011-08-01

24

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

Directory of Open Access Journals (Sweden)

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

C. Yong-Nong

2013-03-01

25

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

26

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

International Nuclear Information System (INIS)

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

2013-06-01

27

A new VME based high voltage power supply for large experiments  

International Nuclear Information System (INIS)

A new VME based high voltage power supply has been developed for the D OE experiment at Fermilab. There are three types of supplies delivering up to ±5.6 kV at 1.0 mA or +2.0 kV at 3.0 mA with a set accuracy of 1.5 V and extremely low voltage ripples. Complete computer control has allowed many special features to be developed for the supply, including user-defined control land monitor groups, variable ramp rates, and advanced histogram and graphic functions. 3 refs

1991-11-05

28

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

1993-01-01

29

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

International Nuclear Information System (INIS)

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

2005-03-01

30

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 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)

31

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

Energy Technology Data Exchange (ETDEWEB)

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

Salvadori, M. C.; Teixeira, F. S.; Araujo, W. W. R.; Sgubin, L. G. [Institute of Physics, University of Sao Paulo, C.P. 66318, CEP 05315-970 Sao Paulo S.P. (Brazil); Sochugov, N. S.; Spirin, R. E. [Institute of High Current Electronics, Siberian Division of the Russian Academy of Sciences, Tomsk 634055 (Russian Federation); Brown, I. G. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-12-15

32

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

International Nuclear Information System (INIS)

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

2010-12-01

33

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

Science.gov (United States)

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

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

2010-12-01

34

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 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.

2013-06-17

35

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

CERN Multimedia

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

36

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

37

Online high voltage power supply ripple estimation and feedforward in LEDA  

International Nuclear Information System (INIS)

The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory will serve as the prototype for the low energy section of Acceleration Production of Tritium (APT) accelerator. This paper addresses the problem of LLRF control system for LEDA. They propose an estimator of the ripple and its time derivative and a control law which is based on PID control and adaptive feedforward of estimated ripple. The control law reduces the effect of the deterministic cathode ripple that is due to high voltage power supply and achieves tracking of desired set points

1999-06-02

38

DESIGN NOTE: A simple and compact high-voltage switch mode power supply for streak cameras  

Science.gov (United States)

The design and development of various high-voltage switch mode power supplies (SMPSs) for use with streak cameras are described. This work details -15 kV(0957-0233/7/11/017/img1), 0957-0233/7/11/017/img2 (1 mA) and 0957-0233/7/11/017/img3 (1 mA) SMPSs for biasing the streak and image intensifier tubes, driving the sweep circuit and positioning the photoelectron beam on the phosphor screen of the streak camera respectively. The design of the high-frequency pulse transformer - the main part of these SMPSs - is also presented.

Shukla, M.; Rai, V. N.; Pant, H. C.

1996-11-01

39

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)

2011-03-01

40

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

 
 
 
 
41

Development of a high voltage and high frequency power supply for electrochemical etching  

International Nuclear Information System (INIS)

For the last several years, CR-39 based neutron dosimeter is in use for personnel neutron dosimetry in many countries. Neutrons interact with constituents of the CR-39 and generate charged particles. These particles may produce tracks in the detector. The revelation of neutron induced charged particle tracks in CR-39, employing chemical etching alone, suffers from poor etched track visibility which makes them difficult to distinguish from the general background. This problem in overcome by a technique called electrochemical etching. The most essential component of the electrochemical etching system is the power supply unit that provides high voltage at a high frequency. We have developed a power supply for the electrochemical etching system and is described in this article. (author)

1996-01-01

42

Technical Specification for a high voltage 120 kW (180 kW peak) power supply  

CERN Multimedia

This specification concerns the supply of regulated DC high voltage power supplies for 120 kW (180 kW peak) each, to be used as anode supplies for tetrode RF-power amplifiers. The maximum voltage required is 6 kV, the maximum average current 20 A (peak current 30 A), and the power supply must be fed from the 400 V 3-phase sustem with a thyristor regulation on the primary side.

Höfle, Wolfgang

2000-01-01

43

High voltage power supply. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

Energy Technology Data Exchange (ETDEWEB)

The bibliography contains citations of selected patents concerning high voltage power supply systems and devices. References describe direct and high current power supplies, microprocessor controlled and programmable systems, amplifiers, power supply stabilization, power circuit protection, feedback control, and pulse modulation. Applications cover laser systems, x-ray tubes, electrophoresis, video apparatus, radar and electronic warfare systems, helmet mounted display, and electrosurgery. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1997-06-01

44

High voltage power supply. (Latest citations from the US Patent bibliographic file with exemplary claims). Published Search  

Energy Technology Data Exchange (ETDEWEB)

The bibliography contains citations of selected patents concerning high voltage power supply systems and devices. References describe direct and high current power supplies, microprocessor controlled and programmable systems, amplifiers, power supply stabilization, power circuit protection, feedback control, and pulse modulation. Applications cover laser systems, x-ray tubes, electrophoresis, video apparatus, radar and electronic warfare systems, helmet mounted display, and electrosurgery. (Contains 50-250 citations and includes a subject term index and title list.) (Copyright NERAC, Inc. 1995)

NONE

1996-03-01

45

Past and future upgrades of the gyrotron high voltage cathode power supplies at the Forschungszentrum Karlsruhe  

International Nuclear Information System (INIS)

The high voltage/high power DC-cathode power supply for the Gyrotron Test Facility at the Forschungszentrum in Karlsruhe consists of a 12-pulse thyristor star-point-controller, a 130 kV capacitor-bank followed by a tetrode regulator. Originally designed for 80 kV/30 A CW (continous-wave) operation, its operating regime has been extended in line with gyrotron development to pulses of 65 kV/45 A/3 min and more recently to 65 kV/80 A/10 s without any changes to the main load bearing components (thyristors, transformers or power tetrode). This allows testing of gyrotrons in the 0.5 MW (CW), 1 MW (3 min) and 2 MW (10 s) output power range. The paper describes the system, its operation and some critical aspects of the last upgrade, such as the issue of harmonics in the 20 kV distribution mains-grid, the dynamic response of the thyristor-controller and the avoidance of microwave parasitic oscillations in the high power tetrode (a CQK-200-4, developed by ABB, Switzerland and now produced by Thales Electron Devices, France). Finally, an outlook is given on the extension-plans of the FZK Gyrotron Test Facility, namely to procure a Pulse-Step-Modulator (PSM) cathode power supply for 100 kV/100 A capable of CW operation for the development and testing of gyrotrons for fusion reactors (i.e. DEMO), with up to 4 MW CW output power. Some of the advantages and disadvantages of a PSM versus an analogue regulator system are being discussed.

2009-06-01

46

Past and future upgrades of the gyrotron high voltage cathode power supplies at the Forschungszentrum Karlsruhe  

Energy Technology Data Exchange (ETDEWEB)

The high voltage/high power DC-cathode power supply for the Gyrotron Test Facility at the Forschungszentrum in Karlsruhe consists of a 12-pulse thyristor star-point-controller, a 130 kV capacitor-bank followed by a tetrode regulator. Originally designed for 80 kV/30 A CW (continous-wave) operation, its operating regime has been extended in line with gyrotron development to pulses of 65 kV/45 A/3 min and more recently to 65 kV/80 A/10 s without any changes to the main load bearing components (thyristors, transformers or power tetrode). This allows testing of gyrotrons in the 0.5 MW (CW), 1 MW (3 min) and 2 MW (10 s) output power range. The paper describes the system, its operation and some critical aspects of the last upgrade, such as the issue of harmonics in the 20 kV distribution mains-grid, the dynamic response of the thyristor-controller and the avoidance of microwave parasitic oscillations in the high power tetrode (a CQK-200-4, developed by ABB, Switzerland and now produced by Thales Electron Devices, France). Finally, an outlook is given on the extension-plans of the FZK Gyrotron Test Facility, namely to procure a Pulse-Step-Modulator (PSM) cathode power supply for 100 kV/100 A capable of CW operation for the development and testing of gyrotrons for fusion reactors (i.e. DEMO), with up to 4 MW CW output power. Some of the advantages and disadvantages of a PSM versus an analogue regulator system are being discussed.

Schmid, M. [Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fuer Hochleistungsimpuls und Mikrowellentechnik, D-76021 Karlsruhe (Germany)], E-mail: Martin.Schmid@ihm.fzk.de; Hrabal, D. [Formerly Siemens AG, Erlangen (Germany); Piosczyk, B. [Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fuer Hochleistungsimpuls und Mikrowellentechnik, D-76021 Karlsruhe (Germany); Thumm, M. [Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut fuer Hochleistungsimpuls und Mikrowellentechnik, D-76021 Karlsruhe (Germany); Universitaet Karlsruhe, Institut fuer Hoechstfrequenztechnik und Elektronik, D-76131 Karlsruhe (Germany)

2009-06-15

47

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.

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

2014-05-01

48

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

49

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

50

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)

1999-07-01

51

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

CERN Multimedia

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

52

Simulation, Design and Construction of High Voltage DC Power Supply at 15 kV Output Using Voltage Multiplier Circuits  

Directory of Open Access Journals (Sweden)

Full Text Available This study describes the details of high voltage DC power supply whose output voltage is 15 kV. In this study, we review the major aspects of the design of voltage multiplier circuits and constructed a prototype power supply based on simulation, design and implementation of the hardware works in the laboratory. Its simulation works done by using EMTDC PSCAD and PSPICE software. Experimental results are presented to verify the simulation results.

N. Mariun

2006-01-01

53

Design and application of the high-voltage DC power-supply control system based on PLC  

International Nuclear Information System (INIS)

The design and application of A kind of high-voltage DC power-supply control system based on PLC is referred, in addition, KingView is used to monitor the system in real time and manage the man-machine conversation ideally

2002-01-01

54

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

International Nuclear Information System (INIS)

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

1993-05-17

55

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

2000-01-01

56

On-line control manipulator for regulation of high-voltage power supply of multi-channel detector counters  

International Nuclear Information System (INIS)

To regulate high-voltage power supply of total absorption 800-channel Cherenkov counters, a mechanical manipulator, operating on-line with HP-2100 A computer is developed. The manipulator comprises a two-coordinate carriage, resistor axis collet clamp, software and hardware systems. The manipulator clamps potentiometer axes and performs their rotation without slipping. The manipulator performs operations in sequence, it averagely spends 5 s per a counter. The accuracy of voltage adjustment using the manipulator makes up ± 5%

1987-01-01

57

On the electrochemical etching of nuclear particle tracks in cellulose nitrate films using 50 Hz high voltage power supply  

International Nuclear Information System (INIS)

The treeing phenomenon observed in electrochemical etching (ECE) of Daicel cellulose nitrate detectors is described. A perspex filter chimney as cell and a 50 Hz high voltage unit for power supply constituted the simple ECE system. It was possible to initiate treeing in the Daicel detector leading to an enlargement of track ends to about 10 ?m in diameter with significant clarity against the background. Various attempts to augment the treeing process and the results obtained so far have been reported. (orig.)

1980-12-01

58

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

International Nuclear Information System (INIS)

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

2010-05-01

59

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

60

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

2001-01-01

 
 
 
 
61

Very high voltage power supply system for the ring imaging Cherenkov detectors of the LHCb experiment  

International Nuclear Information System (INIS)

A modular power supply system is described, for use in the Ring Imaging Cherenkov Detectors of the LHCb experiment. The main characteristics of the supply are very good time stability and voltage resolution, full programmability, floating supplies, self protection and remote control. The choice of a commercial HV module with standard control inputs allows easy customisation to adapt our design to different requirements. The realisation shown here supplies voltages up to 20 kV with a maximum current of 0.5 mA and up to 32 channels on a single crate.

2009-06-11

62

Very high voltage power supply system for the ring imaging Cherenkov detectors of the LHCb experiment  

CERN Document Server

A modular power supply system is described, for use in the Ring Imaging Cherenkov Detectors of the LHCb experiment. The main characteristics of the supply are very good time stability and voltage resolution, full programmability, floating supplies, self protection and remote control. The choice of a commercial HV module with standard control inputs allows easy customisation to adapt our design to different requirements. The realisation shown here supplies voltages up to 20 kV with a maximum current of 0.5 mA and up to 32 channels on a single crate.

Fontanellia, F; Gracco, V; Gys, T; Jost, B; Minì, G; Neufeld, N; Petrolini, A; Piedigrossi, D; Sannino, M

2009-01-01

63

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

Energy Technology Data Exchange (ETDEWEB)

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.

Fathizadeh, M.; Despe, O.D.; McGhee, D.G.; Mills, F.E.; Turner, L.R.

1991-01-01

64

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

Energy Technology Data Exchange (ETDEWEB)

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.

Fathizadeh, M.; Despe, O.D.; McGhee, D.G.; Mills, F.E.; Turner, L.R.

1991-12-31

65

High frequency/high voltage solid state body power supplies for CPD gyrotrons  

International Nuclear Information System (INIS)

A conceptual design and feasibility study has been carried out for a fully solid state Body Power Supply providing the necessary performance required for the modulation of RF power from CW, high power gyrotrons. The selected solution, based on the Pulse Step Modulation concept, is expected to yield cost and operational advantages compared to systems based on vacuum tubes. A second phase for the manufacturing of a full size unit and its testing on a power gyrotron is now in progress

2003-09-01

66

High frequency/high voltage solid state body power supplies for CPD gyrotrons  

Energy Technology Data Exchange (ETDEWEB)

A conceptual design and feasibility study has been carried out for a fully solid state Body Power Supply providing the necessary performance required for the modulation of RF power from CW, high power gyrotrons. The selected solution, based on the Pulse Step Modulation concept, is expected to yield cost and operational advantages compared to systems based on vacuum tubes. A second phase for the manufacturing of a full size unit and its testing on a power gyrotron is now in progress.

Bonicelli, T. E-mail: tullio.bonicelli@tech.efda.org; Claesen, R.; Coletti, A.; Mondino, P.L.; Pretelli, M.; Santinelli, M.; Sita, L.; Taddia, G

2003-09-01

67

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

International Nuclear Information System (INIS)

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.

2011-10-01

68

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

69

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

International Nuclear Information System (INIS)

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

2003-09-01

70

Improved Optimization of the Nominal Functioning of a New Global High Voltage Power Supply N=2 Magnetrons for Microwaves Generator  

Directory of Open Access Journals (Sweden)

Full Text Available This work deals with the energetic validation of a new optimized high voltage power supply for micro-waves generators with N=2 magnetrons that are used as an energy source in industrial applications. In this article, we will apply an optimization strategy that aims at improving the nominal functioning of the optimized power supply with N=2 magnetrons. Unlike research work already done an this topic, this article treats the correct energetic functioning of the two magnetrons. An equivalent scheme in ? of the transformer model is presented with the geometrical parameters taken as reference. This model has been tested with the help of the simulation software Matlab-Simulink close to nominal operation. The theorical results compared to the experimental measures are in good conformity. Following that, we will validate the functioning of the new optimized power supply by calculating the average power and then comparing it with that which was found for the power supply with geometricals parameters taken as reference.

Belhaiba Abderrahim

2012-09-01

71

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

72

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

1985-06-01

73

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

2003-02-03

74

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

Energy Technology Data Exchange (ETDEWEB)

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/mm{sup 2} 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.

Dermengi, P.G.; Kureghan, A.S.; Pokrovsky, S.V.; Tchvanov, V.A.

1994-12-31

75

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

76

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 SF_6 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)

1993-01-01

77

Safety and protection aspect of 15 MW high voltage power supply to drive 6 MW Klystron  

International Nuclear Information System (INIS)

Microwave tubes like magnetron and Klystron are sensitive and high cost devices. Its operational life depends highly upon the protection and interlock circuits associated with it. Multilevel protection system have been incorporated to ensure the operational safety of the Klystron amplifier used to power high-energy Linac system. The scheme implemented to control the various parameters of Linac sub-system is discussed. (author)

2006-11-01

78

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

79

Modeling of New Three-Phase High Voltage Power Supply For Industrial Microwave Generators With One Magnetron Per Phase  

Directory of Open Access Journals (Sweden)

Full Text Available This original work treats the feasibility study of a new HV power supply with a three-phase character, supplying a magnetron 800 Watts-2450 MHz per phase, for industrial microwave generators from the modeling with the EMTP code of a single-phase HV power supply for one magnetron. The exploitation of the modeling, with EMTP code, of the power system for one magnetron is to use, essentially, the developed model of its transformer, which is a ? quadruple, consisting of saturable inductances able to translate the non-linear phenomena of saturation, while guaranteeing the stabilization process of the magnetron current. Using the new power supply device with a three-phase character and the EMTP code, the feasibility study, in nominal mode, of the three-phase power supply was performed satisfactory. The analysis of the results obtained helped to confirm the possibility of functioning of this new system without interaction between magnetrons, which provides, relative to the current device, gains of size, volume, cost of implementation and maintenance and makes this new system more economical, while guaranteeing the regulation process of the current in each magnetron.

El Ghazal Naama

2013-04-01

80

High voltage photovoltaic power converter  

Energy Technology Data Exchange (ETDEWEB)

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

 
 
 
 
81

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 electr...

Zhenbao Zhu; Rui Tian

2009-01-01

82

High-voltage-powered transistorized preamplifier  

International Nuclear Information System (INIS)

One of the problems that is frequently met in the field of nuclear electronics is that of coupling the signal from a high-impedance pulse-type radiation detector to a low-impedance transmission line. Radiation detectors and their associated counting equipment are often separated by a considerable distance and some efficient means of transmitting the signal from the detector to the counting system must be provided. In practice, a low-impedance coaxial cable is used for the transmission line and a cathode-follower or emitter-follower circuit is used to achieve the required impedance match. This paper describes a unique emitter-follower circuit that has been utilized very successfully at the University of Washington. The emitter-follower circuit is unique in that power for the transistor circuit is derived from the high voltage that is supplied to the radiation detector. The two pnp alloy-junction transistors employed in the preamplifier yield.a voltage gain of unity over a dynamic range of from 1 mV to 5 V. Stabilization of the operating voltage for the emitter-follower circuit is provided by a small zener diode. The current drain of a typical remote-scintillation detector employing the circuit ranges from 0.35 to 0.65 mA when the high voltage is supplied to the scintillation detector is varied from 800 to 1 500 V. The unit will drive 500 ft of 52-? coaxial line with a 25% loss in pulse amplitude and has been used with remotely operated scintillation-type detectors and BF3-type neutron detectors with excellent results. (author)

1962-04-01

83

Laser power supply  

International Nuclear Information System (INIS)

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

1975-01-01

84

A high-voltage equipment (high voltage supply, high voltage pulse generators, resonant charging inductance, synchro-instruments for gyrotron frequency measurements) for plasma applications  

International Nuclear Information System (INIS)

This document reports my activities as visitor-professor at the Gyrotron Project - INPE Plasma Laboratory. The main objective of my activities was designing, construction and testing a suitable high-voltage pulse generator for plasma applications, and efforts were concentrated on the following points: Design of high-voltage resonant power supply with tunable output (0 - 50 kV) for line-type high voltage pulse generator; design of line-type pulse generator (4 microseconds pulse duration, 0 - 25 kV tunable voltage) for non linear loads such as a gyrotron and P III reactor; design of resonant charging inductance for resonant line-type pulse generator, and design of high resolution synchro instrument for gyrotron frequency measurement. (author)

1996-01-01

85

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)

2001-02-01

86

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

1992-01-01

87

Performance of the TJ-II ECRH system with the new -80 kV 50 A high voltage power supply  

International Nuclear Information System (INIS)

The ECRH system of the TJ-II stellarator consists of two triode - 53.2 GHz - gyrotrons, which can deliver a maximum power of 300 kW each, during 1 s. Both gyrotrons are fed by a common high voltage power supply (HVPS). During the last experimental campaigns the performance of the gyrotrons were limited by the HVPS, whose maximum output current was limited to 30 A and the ripple level of the output voltage was around 7%. In order to guarantee the reliability of the ECRH system and to improve its performance, a new HVPS has been developed and manufactured by the company JEMA and was commissioned at CIEMAT during 2007. The design is based on solid-state technology and high frequency commutation techniques. The new unit reaches -80 kV and 50 A during a maximum pulse length of 1 s. The complete design, testing and commissioning of the HVPS are presented, as well as the routine operation of the ECRH system during the TJ-II experimental campaign.

2009-06-01

88

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

2002-08-01

89

High voltage superconducting switch for power application  

International Nuclear Information System (INIS)

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

1983-01-01

90

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

91

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

92

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

93

Design, construction and operational results of the IGBT controlled solid state modulator high voltage power supply used in the high power RF systems of the Low Energy Demonstration Accelerator of the accelerator production of tritium (APT) project  

International Nuclear Information System (INIS)

The 1700 MeV, 100 mA Accelerator Production of Tritium (APT) Proton Linac will require 244 1 MW, continuous wave RF systems. 1 MW continuous wave klystrons are used as the RF source and each klystron requires 95 kV, 17 A of beam voltage and current. The cost of the DC power supplies is the single largest percentage of the total RF system cost. Power supply reliability is crucial to overall RF system availability and AC to DC conversion efficiency affects the operating cost. The Low Energy Demonstration Accelerator (LEDA) being constructed at Los Alamos National Laboratory (LANL) will serve as the prototype and test bed for APT. The design of the RF systems used in LEDA is driven by the need to field test high efficiency systems with extremely high reliability before APT is built. The authors present a detailed description and test results of one type of advanced high voltage power supply system using Insulated Gate Bipolar Transistors (IGBTs) that has been used with the LEDA High Power RF systems. The authors also present some of the distinctive features offered by this power supply topology, including crowbarless tube protection and modular construction which allows graceful degradation of power supply operation

1998-08-23

94

Design and simulation for the pulse high-voltage DC power supply (HVPS) of 1.2 MW/2.45 GHz HT-7U lower hybrid current drive system  

International Nuclear Information System (INIS)

The superconducting tokamak HT-7U has been designed by the Institute of Plasma Physics since 1998 and will be set up before 2003. The 1.2 MW/2.45 GHz HT-7U LHCD (Lower hybrid current drive) system which being the most efficient non-induction device can heat the plasma and drive the plasma current has been efficiently in operation now, and a particular design of the 2.8 MW/-35 kV high-voltage DC power supply has been already completed and will apply to the klystron of LHCD on HT-7 and the future HT-7U, and the project of the power supply has been examined and approved professionally by an authorized group of high-level specialist in the Institute of Plasma Physics. The detailed design of the power supply and the simulation results are referred

2000-12-01

95

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)

2010-11-01

96

High voltage beam power source for high frequency heating  

International Nuclear Information System (INIS)

Recently, the importance of the plasma heating by high frequency electric power has increased in the research and development of nuclear fusion. There are three methods in the plasma heating by high frequency electric power, that is, electron cyclotron heating, lower hybrid resonance frequency heating and ion cyclotron range of frequency heating. In all cases, the vacuum tubes requiring high voltage beam power sources are used as the high frequency electric power generator, and the typical vacuum tubes are a gyrotron in ECH, a Klystron in LHRF and a quadrupole tube in ICRF. The gyrotron is a special millimeter wave vibrating tube, while the other two are amplifying tubes, accordingly, severe specification is imposed on the stability of beam voltage and the protection function against load short circuit of the gyrotron. The typical specifications of beam power sources are shown. The vibrating characteristics of a gyrotron are dependent largely on beam voltage and anode voltage. The beam power source for a gyrotron is the type using commercial power or the output of a flywheel generator on-line, or the type making the constant voltage control of the energy accumulated in a condenser bank and supplying it to a gyrotron. The control of beam voltage and anode voltage in the beam power source for a gyrotron and the protection of a gyrotron are discussed. (Kako, I.)

1988-01-01

97

High voltage beam power source for high frequency heating  

Energy Technology Data Exchange (ETDEWEB)

Recently, the importance of the plasma heating by high frequency electric power has increased in the research and development of nuclear fusion. There are three methods in the plasma heating by high frequency electric power, that is, electron cyclotron heating, lower hybrid resonance frequency heating and ion cyclotron range of frequency heating. In all cases, the vacuum tubes requiring high voltage beam power sources are used as the high frequency electric power generator, and the typical vacuum tubes are a gyrotron in ECH, a Klystron in LHRF and a quadrupole tube in ICRF. The gyrotron is a special millimeter wave vibrating tube, while the other two are amplifying tubes, accordingly, severe specification is imposed on the stability of beam voltage and the protection function against load short circuit of the gyrotron. The typical specifications of beam power sources are shown. The vibrating characteristics of a gyrotron are dependent largely on beam voltage and anode voltage. The beam power source for a gyrotron is the type using commercial power or the output of a flywheel generator on-line, or the type making the constant voltage control of the energy accumulated in a condenser bank and supplying it to a gyrotron. The control of beam voltage and anode voltage in the beam power source for a gyrotron and the protection of a gyrotron are discussed. (Kako, I.).

Shiota, Masaru; Gotoh, Masaharu

1988-07-01

98

Geometrical optimization of a surface DBD powered by a nanosecond pulsed high voltage  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this study, surface Dielectric Barrier Discharge (DBD) actuators powered by nanosecond pulsed high voltage are investigated. The goal is to experimentally characterize the surface DBD actuators in terms of electrical and geometrical parameters. The actuators are made of two conducting electrodes separated by a thin dielectric (Kapton films) and arranged asymmetrically. The active electrode is connected to a pulsed high voltage power supply (voltage up to +/- 10 kV, rise and fall times of 5...

Ndong, A. C. Aba Apos A.; Zouzou, N.; Benard, N.; Moreau, E.

2013-01-01

99

Solid-state high voltage, DC power distribution and control  

CERN Multimedia

Future high voltage, high power systems in the early stages of planning include U.S. large accelerator programs such as the Next Linear Collider (NLC), Spallation Neutron Source (SNS), and international systems at DESY, CERN and KEK. There are also many nuclear fusion and multi-megawatt systems proposed for construction or upgrade. Each of these programs faces the challenge of distributing and controlling the high power required by tens to hundreds of RF amplifier tubes (e.g., klystrons) cost effectively. In this paper, we present a new approach for distributing and modulating power based upon recent technological developments in high voltage, high power, solid state switching. DTI's development of fast, high voltage, opening and closing solid state switches enable, for the first time at high voltage, a nearly lossless "DC transformer". With this DC transformer (i.e., down converter or buck regulator), it is now possible to distribute unregulated high voltage DC power in a large facility, and regulate and con...

Gaudreau, M P J; Hawkey, T J; Kempkes, M A; Mulvaney, J M; Ver Planck, P

1999-01-01

100

The reliability of high voltage overhead electric power transmission lines  

Energy Technology Data Exchange (ETDEWEB)

A study is conducted of the reliability of elements of high voltage (VN) overhead power lines (VL) proceeding from a supposition about the linear relationship between the length of the line and the number of its failures per unit of time which is determined using correlational regression analysis.

Yerkhan, F.M.

1983-01-01

 
 
 
 
101

Electric Power Generation and Storage Using a High Voltage Approach  

Energy Technology Data Exchange (ETDEWEB)

Production and consumption of electricity have grown enormously during the last century. No matter what the primary source of energy is, almost all generation of electricity comes from conversion of a rotational movement in a generator. The aim of this thesis is to see how high voltage technology influence production and storage of electricity. Power flow in the generators used to convert mechanical movement to electric energy is analyzed using Poynting's vector. The impact of new generator technology for efficient extraction of hydroelectric power is shown. Simulation of a large permanent magnet turbo generator is presented. A flywheel storage system for electric vehicles utilizing high voltage technology is also presented. In pulsed power applications, a cheap method for intermediate storage of energy during milliseconds, which enables an inductive primary storage is presented and experimentally tested.

Bolund, Bjoern

2006-06-15

102

Selecting the grounding protective device for a system supplying high-voltage electricity in coal mines  

Energy Technology Data Exchange (ETDEWEB)

Currently there is a single opinion that it is necessary to establish a grounding protective device on supply leads of high voltage (6 kV) of a surface power plant in a system of electricity supply from coal mines. Main principles are presented for selecting the grounding protective device. Because of the wetter working medium, narrow working space and the presence of blowout dangerous methane as compared to the surface in the mines, often man comes into contact with a current, ignition of the electric detonator occurs, blasting of methane and other accidents. Indicators for safe electric current are defined respectively for the aforementioned cases. Based on analysis of practical data and conducted calculations, the following conclusions are drawn: the grounding protective device of ZD-4 (system of low current grounding) as applied to mines of low and average productivity; on large mines where there are many high voltage cables (6 kV) a comparatively large grounding electrical capacitance was established, and with single phase grounding of the system comparatively low zero voltage and zero current as applied to the relay of BLD-3. Trends for improving these protective devices are indicated.

Ao, Z.

1982-01-01

103

Voltage generators of high voltage high power accelerators  

Energy Technology Data Exchange (ETDEWEB)

High voltage electron accelerators are widely used in modern radiation installations for industrial purposes. In the near future further increasing of their power may be effected, which enables to raise the efficiency of the radiation processes known and to master new power-consuming production in industry. Improvement of HV generators by increasing their power and efficiency is one of many scientific and engineering aspects the successful solution of which provides further development of these accelerators and their technical parameters. The subject is discussed in detail.

Svinin, M.P. (Nauchno-Issledovatel' skij Inst. Ehlektrofizicheskoj Apparatury, Leningrad (USSR))

1981-01-01

104

Advances in high voltage power switching with GTOs  

International Nuclear Information System (INIS)

The control of high voltage at high power, particularly opening switches, has been difficult in the past. Using gate turnoff thyristors (GTOs) arranged in series enables large currents to be switched at high voltage. The authors report a high voltage opening switch has been successfully demonstrated. This switch uses GTOs in series and successfully operates at voltages higher than the rated voltage of the individual devices. It is believed that this is the first time this has been successfully demonstrated, in that GTOs have been operated in series before, but always in a manner as to not exceed the voltage capability of the individual devices. In short, the devices have not worked together, sharing the voltage, but one device has been operated using several backup devices. Of particular interest is how well the individual devices share the voltage applied to them. Equal voltage sharing between devices is absolutely essential, in order to not exceed the voltage rating of any of the devices in the series chain. This is accomplished at high (microsecond) switching speeds. Thus, the system is useful for high frequency applications as well as high power, making for a flexible circuit system element. This demonstration system is rated at 5 KV and uses 1 KV devices. A larger 24 KV system is under design and will use 4.5 KV devices. In order to design the 24 KV switch, the safe operating area of the large devices must be known thoroughly

1990-08-12

105

High voltage direct current modelling in optimal power flows  

Energy Technology Data Exchange (ETDEWEB)

Two-terminal high voltage direct current (HVDC) transmission links are in operation throughout the world. They are key elements in electrical power networks; their representation is oversimplified or ignored in most power system studies. This is particularly the case in Optima Power Flow (OPF) studies. Hence, an OPF program has been extended to incorporate HVDC links, taking due account of overlapping and power transfer control characteristics. This is a new development in Newton Optimal Power Flows, where the converter equations are included directly in the matrix W. The method is indeed a unified one since the solution vector is extended to accommodate the DC variables. The HVDC link model correctly takes into account the relevant DC limit variables. The impact of HVDC links on OPF studies is illustrated by numeric examples, which includes a 5-node system, the AEP 14-node and a 166-node system. (author)

Ambriz-Perez, H. [Comision Federal de Electricidad, Mexico, Unidad de Ingenieria Especializada, Rio Rodano No. 14 - Piso 10, Sala 1002, Col. Cuauhtemoc, C.P. 06598, Mexico, D.F. (Mexico); Acha, E. [Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G128LT, Scotland (United Kingdom); Fuerte-Esquivel, C.R. [Faculty of Electrical Engineering, Universidad Michoacana de San Nicolas de Hidalgo, Morelia 58030, Michoacan (Mexico)

2008-03-15

106

Condition assessment of high voltage insulation in power system equipment  

CERN Document Server

This book introduces the reader to the major components of a high voltage system and the different insulating materials applied in particular equipments. During a review of these materials, measurable properties suitable for condition assessment are identified. Analyses are included of some of the insulation fault scenarios that may occur in power equipment. The basic facilities for carrying out tests on the internal and external insulation structures at high and low voltages are described. Tests and measurements according to specifications, on-site requirements and research investigations are

James, RE

2007-01-01

107

New high-voltage power transmission line for the Randstad, Netherlands; Randstad krijgt nieuwe hoogspanningslijn  

Energy Technology Data Exchange (ETDEWEB)

A new high-voltage (38 kV) power transmission line is planned between the industrial area Maasvlakte in the Dutch province Zuid-Holland and the North Sea Canal area in the province Noord-Holland (Randstad area). The new line increases the supply security and transport of electricity. [Dutch] Tussen de Maasvlakt en het Noordzeekanaalgebied wordt een nieuwe 380 kV hoogspanningslijn aangelegd. Deze moet de leveringszekerheid vergroten en het transport van meer elektriciteit mogelijk maken.

Van den Berg, J. (ed.)

2007-02-15

108

Alarm radiation dosimeter with improved integrating pulse ionization chamber and high voltage supply  

International Nuclear Information System (INIS)

An alarm dosimeter is described which features an improved integrating pulse ionization chamber of the type containing an hermetically sealed gas diode. Improved operation and miniaturization of the chamber are made possible by a ringing choke converter high voltage supply having a ripple-type output that insures discharge of the gas diode. (author)

1972-11-02

109

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

2000-06-02

110

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

111

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

112

Technological Aspects: High Voltage  

CERN Multimedia

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

113

Static Reactive Power Compensators for High-Voltage Power Systems. Final Report.  

Science.gov (United States)

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 v...

1981-01-01

114

Small-size digital controlled high voltage converter for PM supply  

International Nuclear Information System (INIS)

A compact digital controlled high voltage converter for PM is described. The unit voltage supply is +- 12 V. Maximum output voltage is 2.56 kV. Maximum output current supplied to photocathode is 100 mkA, to the last dynodes is 2 mkA. The current consumable from supply sources without load is 8 mA. The output voltage drift during 8 hours of continuous work is less than 2 V. The 6 unit block has 180x150x50 mm dimensions

1985-01-01

115

Wide-gap large spark chamber supplying by high-voltage radio pulse  

International Nuclear Information System (INIS)

In the process of avalanche formation in wide-gap (2 gaps 15 cm each) spark chambers when supplying them by high-voltage pulse (field intensity is 5.7-7.0 kV/cm, pulse duration-250-150 ns) of unipolar shape, a directed drift of charges in electric field takes place, which results in the shift of the track photographed as to actual particle tra ectory. To decrease the shift in the process of chamber supply a high-voltage radio pulse was used, which presented an attenuatina sinusoid. When supplying the chamber by sign-alternating pulse the shift constitutes 0.16+-0.15 mm, and the angle - 5.3x10-5+- 1.1x10-3 rad. When supplying by unipolar pulse the shift eqUals O.58+-0.40 mm, and the angle - 1.5x10-4+-2.5x10-3 rad. The use of sign-alternating supply permitted to increase the accuracy of track localization and to decrease the dependence of track brightness on the angle of particle entrance to the chamber

1984-01-01

116

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 inco...

Prechanon Kumkratug

2010-01-01

117

Power supplies  

International Nuclear Information System (INIS)

A large number of static D.C. power supply units used for the variable energy cyclotron at Calcutta are listed. The characteristics of the anode power supply (20 kV, 20 A) for the RF oscillator are given. Thyratron tubes and high dissipation heaters have been used. (A.K.)

1977-01-01

118

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

119

A Latchup-Free ESD Power Clamp Circuit with Stacked-Bipolar Devices for High-Voltage Integrated Circuits  

Science.gov (United States)

The holding voltage of high-voltage devices under the snapback breakdown condition has been known to be much smaller than the power supply voltage. Such characteristics cause high-voltage ICs to be susceptible to the transient latch-up failure in the practical system applications, especially when these devices are used as the ESD power clamp circuit. A new latchup-free design of the ESD power clamp circuit with stacked-bipolar devices is proposed and successfully verified in a 0.35µm BCD (Bipolar-CMOS-DMOS) process to achieve the desired ESD level. The total holding voltage of the stacked-bipolar devices in the snapback breakdown condition can be larger than the power supply voltage.

Park, Jae-Young; Song, Jong-Kyu; Jang, Chang-Soo; Kim, San-Hong; Jung, Won-Young; Kim, Taek-Soo

120

The powerful high-voltage glow discharge electron gun and power unit on its base  

Energy Technology Data Exchange (ETDEWEB)

The technical and operational characteristics and features of powerful electron gun with cold cathodes on the basis of high-voltage glow discharge (HGD) are submitted. The systems, ensuring their work are described. Some results of operation and applications of these non-traditional electron guns are presented.

Chernov, V.A. [All-Russian Electrotechnical Institute, Moscow (Russian Federation)

1994-12-31

 
 
 
 
121

RECENT ADVANCES IN HIGH-VOLTAGE DIRECT-CURRENT POWER TRANSMISSION SYSTEM  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The ever increasing progress of high-voltage high-power fully-controlled semiconductor technology continue to have a significant impact on the development of advance power electronic apparatus used to support optimized operation and efficient management of electrical grids, which in many cas-es are fully or partially deregulated networks. Developments advance both the high voltage direct-current (HVDC) power transmission and the flexibility alternating current transmis-sion system (FACTS) tec...

2012-01-01

122

High-voltage supply system for wide-gap spark chambers  

International Nuclear Information System (INIS)

A system of high-voltage supply of wide-gap spark chambers of cosmic muon magnetic spectrometer with 41 ns time delay is described. In the system under consideration the master pulse generated by a logic circuit of event selection passes to an amplifier-former starting the spark gap, which in the turn starts 4 pulse voltage generators (PVG) feeding the spark chambers. A spark gap-brancher serves for synchronous starting the PVG. The ignition electrode of the gap is coated with barium titanium, which gives a possibility to obtain pulses with an amplitude up to 25 kV at a trigger pulse of about 1 kV. To decrease the delay time the gap is made two-cascade and is filled with nitrogen at 3 atm. The system described in in operation for more than two years and stood 105 triggerings. It has been concluded that the system is reliable and its parameters are stable

1980-01-01

123

Monitoring of high voltage supply using the Controller Area Network protocol  

International Nuclear Information System (INIS)

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

2011-06-05

124

Monitoring of high voltage supply using the Controller Area Network protocol  

Energy Technology Data Exchange (ETDEWEB)

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

Luz, Igo Amauri dos S.; Farias, Paulo Cesar M.A.; Guedes, Germano P. [Universidade Estadual de Feira de Santana (UEFS), BA (Brazil)

2011-07-01

125

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

1985-08-01

126

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

127

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

128

A three phase, high voltage, overhead electric power transmission line  

Energy Technology Data Exchange (ETDEWEB)

A figure shows the disposition on a support of wires, split first, second and third phases along the concentric circumferences, which is proposed for increasing the through put of superhigh voltage (SVN) and ultrahigh voltage (UVM) overhead power lines (VL). The wires of the third phase are divided into two identical semiphases, each of which is positioned inside the split first and second phases. The annular structures connect the wires into two pairs of concentrical circumferences, linked by insulators and suspended to the support on the insulators. The first, second and third phases approach each other to the minimally possible clearance with the assigned level of voltage, the distance based on conditions for ensuring the electrical strength of the interphase insulation. The proposed design for split phases makes it possible to increase the mean operational capacity of the line and to reduce its inductivity.

Aleksandrov, G.N.

1982-01-01

129

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

Science.gov (United States)

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

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

2012-09-01

130

Power Supply For 25-Watt Arc Lamp  

Science.gov (United States)

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

Leighty, B. D.

1985-01-01

131

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

132

Analysis of very-high-resistance grounding in high-voltage longwall power systems  

Energy Technology Data Exchange (ETDEWEB)

Shielded cables, which have significantly more capacitance than their unshielded counterparts, are required for high-voltage applications in the coal mining industry. With the long cable runs of a high-voltage longwall system, capacitive charging currents may exceed grounding-resistor currents under ground-fault conditions. An analysis of a typical 4160-V longwall power system that utilizes very-high-resistance grounding (grounding-resistor-current limit of 0.5A) is performed to determine whether or not potential problems exist.

Novak, T. [University of Alabama, Tuscaloosa, AL (USA)

2001-02-01

133

ATLAS SCT POWER SUPPLY SYSTEM  

CERN Document Server

The ATLAS SCT (semiconductor tracker) comprises 2112 barrel modules mounted on four concentric barrels of length 1.5m and up to 1m diameter, and 1976 endcap modules supported by a series of 9 wheels at each end of the barrel. Each module is powered by its own independent, floating low and high voltage power supplies, referenced to ground at the detector shield. Correspondingly, each module has its own distinct cable chain all the way back to the service cavern. This presentation outlines the structure and specification of the SCT Power Supply System, including the high level control software and operational model.

Phillips, P W

2007-01-01

134

Assessment of research directions for high-voltage direct-current power systems  

Science.gov (United States)

The identification of hardware developments and system applications which exemplify cost and operational advantages of integrated ac/dc power systems is discussed. The three principal tasks undertaken were: assessment of equipment developments; quantification of operational advantages; and interaction with system planners. The dissemination of information about high voltage direct current (HVDC) is a critical factor in fostering an understanding of this important adjunct to ac power transmission.

Long, W. F.

1982-09-01

135

Spark-gap crowbar for high-voltage power supply  

International Nuclear Information System (INIS)

A new crowbar circuit employing a pressurized spark gap has been designed to replace the existing ignitron crowbar that protects a 500-kW klystron tube when it arcs. The spark gap offers definite performance advantages when compared to the conventional ignitron circuits. The small overall size makes the spark gap more convenient and the very few components make it more reliable than the ignitron crowbar

1983-08-01

136

Consideration on AC (Power-Frequency) Insulation Tests for High Voltage Power Equipment  

Science.gov (United States)

The present standards of AC insulation tests for high voltage power equipment in Japan are based on the reliability evaluation according to the Weibull statistical distribution as fault (breakdown or partial discharge) occurrence probability of the equipment. This paper analyzes various issues in the process, such as how to apply Weibull distributions as well as their experimentally determined parameters for transformers and GIS’s (gas insulated switchgears). The present evaluation is not considered proper as it does not take into account non-accidental change of the equipment with time. The paper gives the proper expression of the fault probability when two different levels of voltage are applied to equipment. It also discusses the issues of an n-value (slope of V-t characteristics in a logarithmic scale) separated in two time regions as well as experimental data for GIS’s.

Takuma, Tadasu

137

Radon daughter and electromagnetic field measurements in dwellings near high voltage power lines  

International Nuclear Information System (INIS)

The results obtained for dwellings built in the vicinity of power lines showed that the equivalent unattached radon daughter concentration was between 10 and 20% of the attached one. Similar results were obtained for dwellings built away. The concentrations of radon and short lived daughter nuclei were found to be low and all below the EU commonly adopted limits. Electric and magnetic field values indoors were also below the proposed EU limits of 10 kV/m and 6400 mG. Short-lived daughter nuclei were mainly in the attached form, but no positive correlation to electric and/or magnetic field values was found. The observed outdoor concentration values were of the same order to those indoors. Electromagnetic field values outdoors were from 2 to 375 times higher, but invariably below the aforementioned limits. Building construction found to shield the electromagnetic field of high voltage power lines. Insignificant deviations were found for radon and daughter concentration measurements of dwellings built away from high voltage power lines, which may be attributed to the electromagnetic field. However, more measurements are performed in order to investigate the situation further. It is concluded that so far, no clear correlation has been observed between radon and electromagnetic field produced by high voltage power lines

2004-07-02

138

Bipolar model of the electrical environment of the high-voltage direct current power line  

Science.gov (United States)

A numerical model of the ion flow in the vicinity of a high-voltage direct current (HVDC) transmission line operating in corona has been developed. The model solves the system of equations governing electrical potential and positive and negative ion concentrations in bipolar coordinates and includes the effect of horizontal wind. The model predicts the downwind space charge plume and ionic current densities at ground similar to those measured near power lines.

Hoppel, William A.

1985-06-01

139

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

International Nuclear Information System (INIS)

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

2074-03-00

140

Uses of high voltage  

Energy Technology Data Exchange (ETDEWEB)

Described are processes which involve uses of high voltage and strong electromagnetic fields, e.g. natural occurring electricity and apparatus like TV-sets, but the main emphasis is laid on transport of electric power in public electric power supplies. Outlined are criteria used in choosing the public grid voltage. 380 kV is the maximum value currently used in The Netherlands and Belgium, in Canada and the USA 500 kV, 735 kV and 765 kV are used, the USSR uses 750 kV. 14 figs., 3 tabs.

Van der Laan, P.C.

1988-11-01

 
 
 
 
141

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

CERN Document Server

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

Hamad, Ibrahim Abou; Poroseva, Svetlana V

2011-01-01

142

Effect of interactions with the high-voltage network on safe operation of nuclear power plants  

International Nuclear Information System (INIS)

Starting from the mutual influence of the NPP power generators and the adjacent high-voltage network, the most significant problems of station internal load, generator and network are worked out from the viewpoint of safe operation of the nuclear power plants. The effects of mains voltage and frequency deviations on internal load operation is explained together with their possible consequences. Typical causes of dangerous disturbances of stability, their effects on NPP operation and the provisions employed for their elimination and prevention are shown, for the most part, on actual examples. (author)

1989-01-01

143

Effect of earth faults in high-voltage power systems on the medium-voltage level  

Energy Technology Data Exchange (ETDEWEB)

The effect of earth faults in a high-voltage power system on a power system at a lower level is analyzed with reference to an actual case. Calculations performed in the course of simulations showed that, due to the earthing of the neutral of a 50/27.5 kV transformer, faults at the 50 kV level could cause high overvoltages in the 27.5 kV system. disturbances in the surge arresters and cables stopped after the earthing of the neutral was modified.

Gysel, T.; Inderbitzin, M.; Koppl, G.; Odermatt, K.

1984-01-01

144

a Network of Oscillators Emulating the Italian High-Voltage Power Grid  

Science.gov (United States)

In this paper, a dynamical model based on Kuramoto-like oscillators is used to represent the Italian high-voltage power grid. Nodes of the network are generators/substations, while links are the physical connections between generators/substations. The normal operating regime of the power grid corresponds to the regime in which the oscillations of all the nodes are synchronized. We studied the conditions for synchronization and the effect of dynamical perturbations on the nodes. The analysis allows to define several dynamical parameters assessing the dynamical robustness of the network.

Fortuna, Luigi; Frasca, Mattia; Sarra Fiore, Angelo

2012-10-01

145

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

146

Totem pole drive decks for the high-voltage, pulsed-power modulator for a large-scale plasma source ion implantation system  

Energy Technology Data Exchange (ETDEWEB)

Plasma source ion implantation (PSII) is an industrially-relevant technique to change the surface composition of materials, thereby improving the mechanical, chemical, electrical, or optical properties. Pre-manufactured parts are immersed in a plasma and are pulsed with a high voltage source that accelerates the ions to the surface, where they become implanted, modifying the surface characteristics. The high voltage applied to the ``workpiece`` is supplied by a high-voltage, pulsed-power modulator capable of operating to 120 kV, with an output pulse width to 20 uS at a repetition rate of up to 2 kHz. Output currents of up to 60 A, and average powers of 225 kW (6.6 MW peak) will be the ultimate capability. Initial system start-up will be limited by a 60 kV, 1 A charging power supply. This paper describes the totem pole drive decks, the ``on`` deck and ``off`` deck, used as a pre-driver to the main high voltage switch tubes which applies power to the workpiece. The pulse length and frequency are externally controlled and then fiber-optically coupled to the modulator totem pole drive decks. The circuitry of the planar triode drivers will be presented in addition to experimental results.

Gribble, R.J.; Reass, W.A.

1993-07-01

147

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

2005-01-01

148

High-voltage protection of wind power plants; Blitzschutz von Windkraftanlagen  

Energy Technology Data Exchange (ETDEWEB)

The authors explain the physical cause of the lightning risks for wind power plants and suggest limiting values for the expected high-voltage currents. Furthermore they describe possibilities for the protection of the extremely threatened rotor blades and illustrate the application of the lightning protection zone concept for the protection of electric and electronic systems. (orig.) [Deutsch] Die Verfasser legen die physikalischen Ursachen der Blitzgefaehrdung von Windkraftanlagen dar und schlagen Grenzwerte fuer die zu erwartenden Blitzstroeme vor. Weiterhin zeigen sie Moeglichkeiten zum Schutz der besonders gefaehrdeten Rotorblaetter auf und erlaeutern die Anwendung des Blitz-Schutzzonen-Konzepts zum Schutz der elektrischen und elektronischen Systeme. (orig.)

Hopf, C. [Universitaet der Bundeswehr Muenchen, Neubiberg (Germany). Inst. fuer Elektrische Energieversorgung; Wiesinger, J. [Universitaet der Bundeswehr Muenchen, Neubiberg (Germany). Hochspannungstechnik und Elektrische Anlagen

1995-07-10

149

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

International Nuclear Information System (INIS)

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

2002-01-01

150

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.

Draper, Gerald; Vincent, Tim; Kroll, Mary E.; Swanson, John

2005-01-01

151

Bird protection measures on high-voltage power transmission lines - marking techniques; Vogelschutzmassnahmen an Hochspannungsfreileitungen - Markierungstechnik  

Energy Technology Data Exchange (ETDEWEB)

The report presents various marking systems for high voltage overhead power lines (OHL) and documents the corresponding in-service experience. For more than twenty years a large number of different solutions has been experimented with. Considerable difficulties have been experienced in the design of an endurable marking system due to the extreme long-term loads induced by environmental influences. The operational safety of the transmission line may also be effected by the marking systems. The consequences for the operational safety of the high voltage overhead power line must therefore be carefully considered before the installation of a marking system. From the line`s operator point of view an effective and operationally safe marking system, that is also ornithologically standardized is highly desirable. (orig.) [Deutsch] In diesem Bericht werden unterschiedliche Markierungssysteme fuer Hochspannungsfreileitungen vorgestellt, und es wird ueber entsprechende Betriebserfahrungen berichtet. In den vergangenen 20 Jahren ist mit einer Vielzahl unterschiedlicher Loesungen experimentiert worden. Dabei zeigt sich immer wieder, dass die extremen Langzeitbeanspruchungen auf der Freileitung durch die Einwirkung von Umwelteinfluessen erhebliche Schwierigkeiten bei der Gestaltung eines dauerhaft funktionsfaehigen Markierungssystems bereiten. Ausserdem haben die Markierungssysteme teilweise Auswirkungen auf die Betriebssicherheit einer Freileitung. Vor jeder Installation eines Markierungssystems sind deshalb die Auswirkungen auf die Betriebssicherheit einer Leitung gruendlich zu pruefen und abzuwaegen. Wuenschenswert ist aus Betreibersicht eine wirksame und betriebssichere, auch ornithologisch standardisierte Markierung. (orig.)

Baumgaertel, K.; Schmidt, J.T. [Richard Bergner GmbH und Co., Schwabach (Germany). Geschaeftsbereich Elektroarmaturen; Juerdens, C. [VEW Energie AG, Dortmund (Germany)

1997-12-01

152

Charging a Battery-Powered Device with a Fiber-Optically Connected Photonic Power System for Achieving High-Voltage Isolation  

Energy Technology Data Exchange (ETDEWEB)

This paper describes the development and testing of a system to provide isolated power to the cathode-subsystem electronics of an x-ray tube. These components are located at the cathode potential of several hundred kilovolts, requiring a supply of power isolated from this high voltage. In this design a fiber-optically connected photonic power system (PPS) is used to recharge a lithium-ion battery pack, which will subsequently supply power to the cathode-subsystem electronics. The suitability of the commercially available JDSU PPS for this application is evaluated. The output of the ppe converter is characterized. The technical aspects of its use for charging a variety of Li-Ion batteries are discussed. Battery charge protection requirements and safety concerns are also addressed.

Lizon, David C [Los Alamos National Laboratory; Gioria, Jack G [Los Alamos National Laboratory; Dale, Gregory E [Los Alamos National Laboratory; Snyder, Hans R [Los Alamos National Laboratory

2008-01-01

153

High voltage fast switches for nuclear applications  

International Nuclear Information System (INIS)

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

1998-10-21

154

High Voltage Pulsed Power Operation of Inertial Electrostatic Confinement Device at LANL  

Science.gov (United States)

The inertial electrostatic confinement (IEC) system provides a favorable development path for practical fusion applications for technical simplicity, compact size, and long target lifetime. In order to improve the efficiency of the IEC system, a novel plasma heating concept based on a periodically oscillating plasma sphere (POPS) was proposed theoretically. Following the recent experimental confirmation of POPS oscillation, a high voltage pulsed power system has been constructed to provide fusion relevant voltages up to 75 kV. In this poster, we will present initial results about the virtual cathode formation and its stability using this pulsed power system. Separately, we will discuss the conventional IEC operation based on glow discharges at LANL for nuclear assay applications.

Park, J.; Mansfield, C. R.

2005-10-01

155

Low Voltage Power Supply Incorporating Ceramic Transformer  

CERN Multimedia

A low voltage power supply provides the regulated output voltage of 1 V from the supply voltage around 48 V. The low voltage power supply incorporates a ceramic transformer which utilizes piezoelectric effect to convert voltage. The ceramic transformer isolates the secondary from the primary, thus providing the ground isolation between the supply and the output voltages. The ceramic transformer takes the place of the conventional magnetic transformer. The ceramic transformer is constructed from a ceramic bar and does not include any magnetic material. So the low voltage power supply can operate under a magnetic field. The output voltage is stabilized by feedback. A feedback loop consists of an error amplifier, a voltage controlled oscillator and a driver circuit. The amplitude ratio of the transformer has dependence on the frequency, which is utilized to stabilize the output voltage. The low voltage power supply is investigated on the analogy of the high voltage power supply similarly incorporating the cerami...

Imori, M

2007-01-01

156

High voltage engineering  

CERN Document Server

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

Rizk, Farouk AM

2014-01-01

157

The design of high voltage overhead power lines (LEP) between 1976 and 1980 in Hungary  

Energy Technology Data Exchange (ETDEWEB)

A wide range of questions about the design of 120, 400 and 750 kilovolt overhead power lines (LEP) in the years of the Fifth Five Year Plan in the electric power system of Hungary is examined. The issues of savings in the building of overhead power lines are presented and the materials from the development of plans for the rational design of supports and foundations and their use in other branches of the national economy are correlated. The use of different types of supports in the future is evaluated. The improvement of the primary equipment for substations (PS) predetermines the development of control systems, RZ, PA and secondary connections. The characteristics are given of the level achieved in this field in Hungary's electric power system. Illustrations are cited of the characteristic designs of high voltage (VN) and superhigh voltage (SVN) supports. The difficulties in selecting the routes of the overhead power lines predetermine the development of support designs rated at suspending four links: two 220 kilovolt and two 120 kilovolt overhead power lines.

Toth, J.; Sagi, L.

1980-01-01

158

Assessment of research directions for high-voltage direct-current power systems. Final report  

Energy Technology Data Exchange (ETDEWEB)

High voltage direct current (HVDC) power transmission continues to be an emerging technology nearly thirty years after its introduction into modern power systems. To date its use has been restricted to either specialized applications having identifiable economic advantages (e.g., breakeven distance) or, rarely, applications where decoupling is needed. Only recently have the operational advantages (e.g., power modulation) of HVDC been realized on operating systems. A research project whose objective was to identify hardware developments and, where appropriate, system applications which can exemplify cost and operational advantages of integrated ac/dc power systems is discussed. The three principal tasks undertaken were: assessment of equipment developments; quantification of operational advantages; and interaction with system planners. Interest in HVDC power transmission has increased markedly over the past several years, and many new systems are now being investigated. The dissemination of information about HVDC, including specifically the symposium undertaken for Task 3, is a critical factor in fostering an understanding of this important adjunct to ac power transmission.

Long, W F

1982-09-01

159

Power water high-voltage shaping line with hydraulic shock damping  

International Nuclear Information System (INIS)

To avoid a hydraulic impact on a dielectric material during power high-voltage pulse shaping a double shaping line (DSL) is developed for the ''KALMAR-1'' accelerator at electron energy of 1 MeV, beam current of 0.4 MA and a pulse duration of 100 ns. To prevent the design destruction due to a hydraulic impact the DSL structure filled with distilled water as a dielectric material provides for an impulse backwash of the intermediary cylinder of the line when a discharger operates. The hydraulic impact damping system has proved its efficiency. The DSL withstood more than 1000 operatings without failure with 20 kJ per pulse energy release into distilled water

1978-01-01

160

High-voltage disconnect protection  

Energy Technology Data Exchange (ETDEWEB)

The apparatus comprises a high-voltage disconnect and load-isolation switch. During normal operations, commercial power is conducted through a pair of contacts a and b to a load. When a high-voltage (HV) component is detected by an HV pulse detector, a command from the HV detector opens a secondary power interrupter while simultaneously activating the opening of contacts a and b. A surge protector conducts some of the HV energy greater than the source, or commercial power, to ground. As contacts a and b open, HV ground probes are positioned at a slight distance (dielectric constant equal to the commercial power source) from these contacts. These probes provide a ground source for an HV component throughout the complete transition of contact b to the rest position, which will be at ground potential. There is now full isolation from the source of power supply.

Frank, D.; Flemming, E.

1984-11-16

 
 
 
 
161

Radon Progeny Activities in the Vicinity of High Voltage Power Lines  

Energy Technology Data Exchange (ETDEWEB)

The principal objective of the work reported here was to investigate the influence of electric fields from high voltage power lines on the behaviour of short-lived, alpha particle emitting radon progeny in outdoor air. Active and passive measurements of short-lived radon progeny were made at one metre above ground level, at various distances from a 400 kV power line, both when the line was energised and during a period when it was switched off for engineering modifications. Within the limitations of the measurement techniques used no effect at ground level on short-lived radon progeny behaviour due to the power line could be detected. Elevated levels of the long-lived radon decay product {sup 210}Po were measured on 36 year old glass insulators taken from a 110 kV power line indicating that electric fields from power lines may remove radon progeny from the air. Radon progeny detection techniques employed were based on the use of solid state nuclear track detectors. (author)

McLaughlin, J.P.; Gath, G

1999-07-01

162

Radon Progeny Activities in the Vicinity of High Voltage Power Lines  

International Nuclear Information System (INIS)

The principal objective of the work reported here was to investigate the influence of electric fields from high voltage power lines on the behaviour of short-lived, alpha particle emitting radon progeny in outdoor air. Active and passive measurements of short-lived radon progeny were made at one metre above ground level, at various distances from a 400 kV power line, both when the line was energised and during a period when it was switched off for engineering modifications. Within the limitations of the measurement techniques used no effect at ground level on short-lived radon progeny behaviour due to the power line could be detected. Elevated levels of the long-lived radon decay product 210Po were measured on 36 year old glass insulators taken from a 110 kV power line indicating that electric fields from power lines may remove radon progeny from the air. Radon progeny detection techniques employed were based on the use of solid state nuclear track detectors. (author)

1999-01-01

163

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

164

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2010-01-01

165

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).

2010-01-01

166

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

Science.gov (United States)

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

Masuda, T.; Iwai, E.; Kawasaki, N.; Kim, E. J.; Komatsubara, T. K.; Lee, J. W.; Lim, G. Y.; Maeda, Y.; Naito, D.; Nanjo, H.; Nomura, T.; Ri, Y. D.; Sasao, N.; Sato, K.; Seki, S.; Shiomi, K.; Sugiyama, Y.; Togawa, M.; Watanabe, H.; Yamanaka, T.

2014-05-01

167

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

Science.gov (United States)

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

Jacobson, David Allan Nils

2000-11-01

168

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

169

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 that are in close agreement with the FE-BE modeling prediction

2008-10-01

170

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

International Nuclear Information System (INIS)

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

2005-09-28

171

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)

2003-01-01

172

A computer-controlled current-comparator-based load loss standard for calibrating high-voltage power measurement systems  

Energy Technology Data Exchange (ETDEWEB)

A computer-controlled load loss standard, based on the current-comparator technique, for calibrating high-voltage power measurement systems is described. Measurements can be made at any power factor from zero lag through unity to zero lead, positive or negative power, at voltages up to 100 W, currents up to 1000 A, and 50 or 60 Hz. The load loss standard features current-comparator-based components including a high-voltage active divider, a unity-gain integrator for producing an accurate and stable reactive component, a high-current transconductance amplifier with the ability to provide a highly accurate current to a circuit that is operated at high voltage, and a computer for control and data reduction. The load loss standard has accuracies of better than 500 ppm in magnitude and 20 ppm in phase.

So, E.; Miljanic, P.N.; Angelo, D. [National Research Council of Canada, Ottawa, Ontario (Canada)

1994-12-31

173

Spectral matrix methods for partitioning power grids: Applications to the Italian and Floridian high-voltage networks  

CERN Multimedia

Intentional islanding is used to limit cascading power failures by isolating highly connected "islands" with local generating capacity. To efficiently isolate an island, one should break as few power lines as possible. This is a graph partitioning problem, and here we give preliminary results on islanding of the Italian and Floridian high-voltage grids by spectral matrix methods.

Hamad, Ibrahim Abou; Rikvold, Per Arne; Poroseva, Svetlana V

2010-01-01

174

Characterization of the Li(Si)/CoS(2) couple for a high-voltage, high-power thermal battery  

Energy Technology Data Exchange (ETDEWEB)

In order to determined the capabilities of a thermal battery with high-voltage and high-power requirements, a detailed characterization of the candidate LiSi/LiCl-LiBr-LiF/CoS{sub 2} electrochemical couple was conducted. The rate capability of this system was investigated using 0.75 inch-dia. and 1.25 inch-dia. single and multiple cells under isothermal conditions, where the cells were regularly pulsed at increasingly higher currents. Limitations of the electronic loads and power supplies necessitated using batteries to obtain the desired maximum current densities possible for this system. Both 1.25 inch-dia. and 3 inch-dia. stacks were used with the number of cells ranging from 5 to 20. Initial tests involved 1.25 inch-dia. cells, where current densities in excess of 15 A/cm{sup 2} (>200 W/cm{sup 2}) were attained with 20-cell batteries during 1-s pulses. In subsequent follow-up tests with 3 inch-dia., 10-cell batteries, ten 400-A 1-s pulses were delivered over an operating period often minutes. These tests formed the foundation for subsequent full-sized battery tests with 125 cells with this chemistry.

GUIDOTTI,RONALD A.; REINHARDT,FREDERICK W.

2000-02-01

175

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

176

Problems on unification of high-voltage electron accelerators  

International Nuclear Information System (INIS)

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

1975-10-03

177

High voltage pulsing system for wire spark chambers  

International Nuclear Information System (INIS)

High voltage pulsing system for wire spark chamber has been constructed for the high energy physics experiment at INS 1.3 GeV electron synchrotron. This system consists of a high voltage power supply, a Thyratron pulse generator and a Krytron trigger circuit. In this paper, characteristic features, circuit diagrams and test results of this system are described. (author)

1981-01-01

178

Environmental justice: a contrary finding for the case of high-voltage electric power transmission lines.  

Science.gov (United States)

Environmental justice is the consideration of whether minority and/or lower-income residents in a geographic area are likely to have disproportionately higher exposures to environmental toxins than those living elsewhere. Such situations have been identified for a variety of factors, such as air pollution, hazardous waste, water quality, noise, residential crowding, and housing quality. This study investigates the application of this concept to high-voltage electric power transmission lines (HVTL), which some perceive as a health risk because of the magnetic fields they generate, and also as esthetically unpleasing. We mapped all 345 kV and higher voltage HVTL in New York State and extracted and summarized proximate US Census sociodemographic and housing characteristic data into four categories on the basis of distances from HVTL. Contrary to our expectation, people living within 2000 ft from HVTL were more likely to be exposed to magnetic fields, white, of higher income, more educated and home owners, than those living farther away, particularly in urban areas. Possible explanations for these patterns include the desire for the open space created by the rights-of-way, the preference for new homes/subdivisions that are often located near HVTL, and moving closer to HVTL before EMFs were considered a risk. This study suggests that environmental justice may not apply to all environmental risk factors and that one must be cautious in generalizing. In addition, it shows the utility of geographical information system methodology for summarizing information from extremely large populations, often a challenge in epidemiology. PMID:19352413

Wartenberg, Daniel; Greenberg, Michael R; Harris, Gerald

2010-05-01

179

Evaluation of high energy neutron-induced single event burnout in high voltage power devices  

International Nuclear Information System (INIS)

Single event effects on semiconductor devices, such as hard error and soft error, caused by terrestrial neutron are one of the urgent issues at ground level. This paper present evaluation results of high energy neutron-induced single event burnout in high voltage devices. (author)

2010-10-01

180

Proposal for the award of a contract without competitive tendering for the supply of coaxial high-voltage cable for the LHC beam dumping system  

CERN Document Server

This document concerns the award of a contract without competitive tendering for the supply of two types of coaxial high-voltage cable for the LHC beam dumping system. Following a market survey carried out among 14 firms in four Member States, a call for tenders (IT-2969/SL/LHC) was sent on 10 July 2001 to one firm. By the closing date, CERN had received one tender. The Finance Committee is invited to agree to the negotiation of a contract with DRAKA MULTIMEDIA CABLE (DE), the only bidder, for the supply of 14 km of coaxial high-voltage cable for the LHC beam dumping system for a total amount of 530 488 euros (779 900 Swiss francs), not subject to revision. The rate of exchange which has been used is that stipulated in the tender. The firm has indicated the following distribution by country of the contract value covered by this adjudication proposal: DE - 100%.

2002-01-01

 
 
 
 
181

Magawatt h-v dc power supplies  

International Nuclear Information System (INIS)

For the injection of heavy, multiply charged ions into accelerators or for injection of cluster ions into fusion reactors, physicists require high-voltage dc power supplies with voltages in the range of 0.5 to 3 MV and currents of the order of several hundred milliamperes, and even amperes. Several power supplies in this range have been built recently, some for particle injectors and some for testing uhv dc transmission line components. In 1974, high-voltage dc power supplies with the following output ratings were completed: 2.5 MV/200 mA, 2.2 MV/200 mA, 1.2 MV/100 mA, and 1.0 MV/120 mA. All power supplies are built according to the symmetrical Cockcroft-Walton generator principle, and are either air-insulated open structures or built into a pressure vessel and insulated with high-pressure sulphur hexafluoride. Based upon theoretical considerations and experience gained with units previously built, it appears feasible to design even more powerful generators. (auth)

1975-06-01

182

Tuning magnet power supply  

International Nuclear Information System (INIS)

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

1989-03-20

183

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.

2007-01-01

184

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)

1980-01-01

185

Development of the power supplies of the prototype ion source for the EAST  

International Nuclear Information System (INIS)

For the neutral beam injector (NBI) of the Experimental Advanced Superconducting Tokamak (EAST), a test stand of a high-current ion source has been in construction. The NBI power supply system includes the plasma generator power supply, plasma electrode power supply, high voltage power divider, negative high voltage power supply, and the transmission lines and the snubber. A multi-megawatt prototype ion source was developed. The arc discharge of the prototype ion source was obtained in the test. The test results for the ion source power supplies and the arc discharge of the ion source are presented. (authors)

2011-11-01

186

Klystron Bias Power Supplies for Indus-2 Synchrotron Radiation Source  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The functioning of an alternating current (AC) voltage regulator based high voltage direct current (HVDC) power supplies with better input and output performances has been presented in this paper. The authors have incorporated a 3-phase series limiting inductor, along with detuned passive filter in each power supply, to take care of line harmonics and the input power factor (IPF), which is simple, cost effective, reliable and provides input performance matching that of an equivalent active fi...

2008-01-01

187

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

188

High-voltage engineering  

Energy Technology Data Exchange (ETDEWEB)

The topics covered in this book include gas discharge, insulating materials, system earthing, overvoltage and insulation coordination, and high-voltage equipment and testing techniques. In two chapters, the principles of design of high-voltage busbars are discussed, together with their insulation and ampacity, whether they are of conventional air-insulated type or the metal-clad GIS types now widely used at the HV and EHV levels. The various types of circuit breakers and cables are discussed including mention of solid-state breakers and superconducting cables. The authors present a treatment of power system grounding, external and internal overvoltages imposed on system insulation, and techniques adopted for insulation coordination. The last three chapters focus on the area of insulation testing, covering the topics of high-voltage generation, measurements, and standard specifications.

Khalifa, M. (Cairo Univ., Giza (EG))

1990-01-01

189

High voltage coaxial switch  

Energy Technology Data Exchange (ETDEWEB)

A coaxial high voltage, high current switch having a solid cylindrical cold cathode coaxially surrounded by a thin hollow cylindrical inner electrode and a larger hollow cylindrical outer electrode. A high voltage trigger between the cathode and the inner electrode causes electrons to be emitted from the cathode and flow to the inner electrode preferably through a vacuum. Some of the electrons penetrate the inner electrode and cause a volumetric discharge in the gas (which may be merely air) between the inner and outer electrodes. The discharge provides a low impedance path between a high voltage charge placed on the outer electrode and a load (which may be a high power laser) coupled to the inner electrode. For high repetition rate the gas between the inner and outer electrodes may be continuously exchanged or refreshed under pressure. 3 figs.

Rink, J.P.

1983-07-19

190

High voltage coaxial switch  

Energy Technology Data Exchange (ETDEWEB)

A coaxial high voltage, high current switch having a solid cylindrical cold cathode coaxially surrounded by a thin hollow cylindrical inner electrode and a larger hollow cylindrical outer electrode. A high voltage trigger between the cathode and the inner electrode causes electrons to be emitted from the cathode and flow to the inner electrode preferably through a vacuum. Some of the electrons penetrate the inner electrode and cause a volumetric discharge in the gas (which may be merely air) between the inner and outer electrodes. The discharge provides a low impedance path between a high voltage charge placed on the outer electrode and a load (which may be a high power laser) coupled to the inner electrode. For high repetition rate the gas between the inner and outer electrodes may be continuously exchanged or refreshed under pressure.

Rink, John P. (Los Alamos, NM)

1983-07-19

191

Power supply monitoring system for high-voltage supply to an ionisation chamber  

International Nuclear Information System (INIS)

The ionization chamber is used for control of particle accelerators and consequently loaded with high dose-rates during radiation pulses. The measuring equipment consists of a transmitter- and receiver-system with opto-coupler, hallgenerators, field plates or isolating transformer and controls a relais which allows to block the direct current components. (DG)

1980-01-01

192

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.

1993-01-01

193

Switch mode power supply  

Energy Technology Data Exchange (ETDEWEB)

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.

Kim, Hui Jun

1993-06-15

194

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

195

The study and design of power quality control in HT-7U power supply system  

Energy Technology Data Exchange (ETDEWEB)

This paper presents the study and design of power quality (PQ) control in HT-7U power supply system. The design, principle and features are introduced. The R and D on high voltage AC compound switch, a novel topology of hybrid active power filter (APF) and a new approach to detect reactive power in real time are described.

Liu, Z.Z. E-mail: zzliu@ipp.ac.cn; Tao, J.; Wang, X.H

2003-09-01

196

The study and design of power quality control in HT-7U power supply system  

International Nuclear Information System (INIS)

This paper presents the study and design of power quality (PQ) control in HT-7U power supply system. The design, principle and features are introduced. The R and D on high voltage AC compound switch, a novel topology of hybrid active power filter (APF) and a new approach to detect reactive power in real time are described

2003-09-01

197

Construction of a high voltage aerial power line over difficult terrain and with adverse foundation conditions in Nigeria  

Energy Technology Data Exchange (ETDEWEB)

The authors report on the foundation plans including the earth survey methods, the assembly procedure used and on the special transport problems which characterised the recent construction of a 330 kv high voltage aerial power line in Nigeria. The methods applied contributed significantly to the fact that BBC (Brown Boveri) was able to successfully complete the construction of this power line in an extremely short time under the adverse terrain conditions offered by the swamps and jungle of the Niger delta, and to hand over the line to the customer for punctual switch in.

Kaeufl, O.; Kummermehr, R.

1983-09-12

198

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)

2007-01-01

199

IFSMTF power supply regulator  

International Nuclear Information System (INIS)

The high-current, low-voltage power supplies for the International Fusion Superconducting Magnet Test Facility at Oak Ridge National Laboratories has been redesigned to eliminate stability problems caused by limiting action and related system dynamics. This paper describes the redesign, simulation, and testing of the power supply regulator for a 2-H, 15,000-A superconducting coil. Included in the paper are circuit models, frequency domain block diagrams, and CSMP simulations of the regulator. The regulator consists of an inner voltage loop and an outer current loop and is provided with adjustable voltage and current limits. The simulation includes a nonlinear function to characterize the gate drive and rectifier units of the power supply. Experimental data demonstrating the performance of the regulator are included for comparisons with the simulation. The large power supplies for the International Fusion Superconducting Magnet Test Facility (IFSMTF) superconducting magnets showed stability problems during the two-coil test in 1984. The problems that were revealed when the power supplies were tested with the large inductive loads have been traced to the regulator design. This paper describes the results of a study of the problem as well as the new regulator design, which is stable under all modes of operation and provides both current and voltage control with adjustable limits

1986-01-01

200

Health responses to a new high-voltage power line route: design of a quasi-experimental prospective field study in the Netherlands  

Science.gov (United States)

Background New high-voltage power transmission lines will be introduced due to increasing demand for reliable and renewable energy supplies. Some residents associate non-specific health complaints with exposure to electromagnetic fields from nearby power lines. This study protocol describes the design and rationale of a prospective study investigating whether the introduction of a new power line triggers health responses in residents living nearby. Methods/Design The study is designed as a quasi-experimental field study with two pretests during the construction of a new power line route, and two posttests after it has been put into operation. Key outcomes are self-reported non-specific somatic and cognitive health complaints, and attribution of these health complaints to a power line. The main determinant is proximity to the new power line route. One member of every household (n?=?2379) residing in close proximity (0-500 meters) to the overhead parts of a new power line route in the Netherlands is invited to participate, as well as a sample of household members (n?=?2382) residing farther away (500-2000 meters). Multilevel analysis will be employed to test whether an increase in key outcome measures is related to proximity to the line. Longitudinal structural equation models will be applied to test to what extent health responses are mediated by psychosocial health mechanisms and moderated by negative oriented personality traits. Discussion This is the first study to investigate health responses to a new power line route in a prospective manner. The results will provide theoretical insight into psychosocial mechanisms operating during the introduction of an environmental health risk, and may offer suggestions to policymakers and other stakeholders for minimizing adverse health responses when introducing new high-voltage power lines.

2014-01-01

 
 
 
 
201

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

202

Electric power high-voltage transmission lines: Design options, cost, and electric and magnetic field levels  

Energy Technology Data Exchange (ETDEWEB)

This report provides background information about (1) the electric and magnetic fields (EMFs) of high-voltage transmission lines at typical voltages and line configurations and (2) typical transmission line costs to assist on alternatives in environmental documents. EMF strengths at 0 {+-} 200 ft from centerline were calculated for ac overhead lines, and for 345 and 230-kV ac underground line and for a {+-}450-kV dc overhead line. Compacting and height sensitivity factors were computed for the variation in EMFs when line conductors are moved closer or raised. Estimated costs for the lines are presented and discussed so that the impact of using alternative strategies for reducing EMF strengths and the implications of implementing the strategies can be better appreciated.

Stoffel, J.B.; Pentecost, E.D.; Roman, R.D.; Traczyk, P.A.

1994-11-01

203

MOS power transistor and ceramic thyratron for fast high voltage pulser  

International Nuclear Information System (INIS)

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

1984-05-01

204

MOS power transistor and ceramic thyratron for fast high voltage pulser  

Energy Technology Data Exchange (ETDEWEB)

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

Beninati, A.; Busso, L.; Panzieri, D.; Tosello, F. (Istituto Nazionale di Fisica Nucleare, Turin (Italy); Turin Univ. (Italy). Ist. di Fisica Generale)

1984-05-01

205

Intelligent power supply controller  

International Nuclear Information System (INIS)

The authors have developed a new power supply controller which would combine 20-bit precision, simple interfacing, and versatile software control. It performs many tasks internal to the power supply and also communicates with an external host computer. Parameters can be entered and/or read over a serial link using one of the 82 command words. In addition, an optional remote control panel can be located up to thousands of feet away. This new controller will reduce the software development time normally spent by the user, while increasing the reliability of the system. The cost is less than buying the equivalent separate CAMAC system. Nonvolatile memory remembers all configuration data; one generic controller can thus be programmed to use anywhere from the smallest power supply to the largest. The controllers will be used at the Clinton P. Anderson Meson Facility at Los Alamos

1991-05-06

206

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.

Brasil R.O.

1999-01-01

207

Development of klystron pulse power supply for XFEL/SPring-8  

International Nuclear Information System (INIS)

XFEL project at SPring-8 requires a pulse power supply which equips highly stable high voltage, and a compact size body. To meet the request, we have developed the compact oil-filled power supply in which the high voltage components are stored in the insulation oil. The shell of the tank is composed of thick steel plates, which enhances the stiffness of the body (monocoque structure). The steel plate shields the EMI noise emission generated by the high power pulse current. The power supply is designed for easy maintenance, and equips the maintenance-free cooling system. Since Nov. 2007, the power supply has worked well. (author)

2008-08-06

208

Regional power supply  

Energy Technology Data Exchange (ETDEWEB)

Dr. Otto Hauser, chairman of the board of the Arbeitsgemeinschaft regionaler Versorgungsunternehmen (ARE) and of the Isar-Amperwerke AG, Munich, stated that the assurance of reliable and low-cost power supply to large areas is and remains the main task of the regional utilities. His lecture is presented in full wording.

Hausner, O.

1984-07-01

209

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

1994-01-01

210

APS power supply controls  

Energy Technology Data Exchange (ETDEWEB)

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.

Saunders, C.W.; Despe, O.D.

1994-03-31

211

Discontinuous Mode Power Supply  

Science.gov (United States)

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

Lagadinos, John; Poulos, Ethel

2012-01-01

212

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

213

Proposal for the award of a blanket order contract for the supply and installation of high-voltage metal-clad compartmented switchgear  

CERN Document Server

This document concerns the award of a blanket order contract for the supply and installation of high-voltage metal-clad compartmented switchgear. Following a market survey (MS-2761/ST) carried out among 59 firms in fifteen Member States, a call for tenders (IT-2827/ST) was sent on 23 January 2001 to 14 firms in ten Member States. By the closing date, CERN had received eight tenders from eight firms in seven Member States. The Finance Committee is invited to agree to the negotiation of a blanket order contract with SCHNEIDER ELECTRIC (IT), the lowest bidder, for the supply and installation of high-voltage metal-clad compartmented switchgear for a total amount of 4 300 000 euros (6 611 000 Swiss francs), not subject to revision until 31 July 2003. The rate of exchange which has been used is that stipulated in the tender. The firm has indicated the following distribution by country of the contract value covered by this adjudication proposal: IT - 70%; FR - 30%.

2001-01-01

214

High-voltage converter  

Energy Technology Data Exchange (ETDEWEB)

A high-voltage converter with an output of 60 kV and a current of 10 mA that consists of six identical modules is described. With the phases of the clock pulses in each of the modules shifted by 60-360/sup 0/, under nominal conditions the ripple level is < 0.25%, for which the specific power is 120 W/dm/sup 2/ and the impact (output) capacitance is 50 pF.

Petrov, Yu.I.; Pokryvailo, A.D.

1986-10-01

215

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

1985-08-01

216

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

International Nuclear Information System (INIS)

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

2001-10-03

217

Multi-channel high voltage and control system for photomultipliers  

Energy Technology Data Exchange (ETDEWEB)

We describe a multi-channel, high-voltage, power supply system with individual channel control and monitoring via a PC. A power base voltage divider generates the individual HV requirement for each photomultiplier. We describe how the inclusion of an active voltage divider in each power base ensures outstanding performance with regard to rate effect, pulse linearity, and dc linearity.

Banks, P.G. [Electron Tubes Ltd, Bury Street, Ruislip HA4 7TA (United Kingdom); Nikitin, A. [Electron Tubes Ltd, Bury Street, Ruislip HA4 7TA (United Kingdom); Pizzey, J.D. [Electron Tubes Ltd, Bury Street, Ruislip HA4 7TA (United Kingdom); Wright, A.G. [Electron Tubes Ltd, Bury Street, Ruislip HA4 7TA (United Kingdom)]. E-mail: tony.wright@electron-tubes.co.uk

2006-01-15

218

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)

1983-03-01

219

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

220

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

Hannisdal, Erik Lundegaard

2011-01-01

 
 
 
 
221

One high voltage direct current HVAC power station Malaysia planning produce intelligent power controller artificial neural networks ANN techniques. controller action Touchet down main power switch current levels goes up down fluctuation  

Science.gov (United States)

Did you mean: One high voltage direct current HVAC power station Malaysia planning produce intelligent power controller artificial neural networks ANN techniques. controller action Touchet down main power switch current levels goes up down fluctuation ?

222

Pneumatic Power Supply  

Science.gov (United States)

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

Bartelt, Terry L.

2009-05-01

223

Power- Supply Network Modeling  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This work deals with the extraction of ICEM parameters and its validation on the power supply network of a 8-bit microcontroller. The objective of the ICEM model [1] (Integrated Circuit Electromagnetic Model) for Components is to propose electrical modeling for conducted and radiation emission prediction [2]. The ICEM model is based on two sub-models. The first one models the power network of the I.C. and the second one models the I.C. activity as a current generator. The ICEM model can be us...

Levant, Jean-luc; Ramdani, Mohamed; Perdriau, Richard

2002-01-01

224

Traction power supply of DB; Bahnenergieversorgung der DB  

Energy Technology Data Exchange (ETDEWEB)

For 16,7 Hz traction power supply of Deutsche Bahn actually there are installed 3 GW rated power in thermal and hydro power plants as well as in rotary and static converter stations. Energy is mostly transported and distributed by an own high voltage grid which is operated in interconnection with those of Austria and Switzerland. Only a small part is fed directly to the overhead contact lines. (orig.)

Perschbacher, Michael [DB Netz AG, Frankfurt am Main (DE). Zentrale I.NPT 1 (E)

2011-01-15

225

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

CERN Multimedia

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

226

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

CERN Multimedia

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

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

CERN Multimedia

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

228

Engineering Design of the ITER AC/DC Power Supplies  

Energy Technology Data Exchange (ETDEWEB)

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.

Oh, B. H.; Lee, K. W.; Hwang, C. K.; Jin, J. T.; Chang, D. S.; Kim, T. S

2009-02-15

229

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

2009-01-01

230

Power semiconductor switch of high-voltage pulses with nanosecond pule rise time  

International Nuclear Information System (INIS)

Results of studies of new fast-acting semiconductor devices such as deep-level dynistors intended for use in high-power devices of nano- and microsecond pulsed-power technology are presented. The possibility of switching multikiloampere current pulses having a pulse rise rate of 200 kA/ s with the use of a single device with a 12 mm diameter structure is shown. The high-power switch based on an assembly of dynistors with an operating voltage of 12 kV connected in series is described. The switch is capable of switching current pulses with 1200 A amplitude and 4 ns rise time

2007-01-01

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)

1996-01-01

232

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

1992-07-01

233

Development of a high-voltage, high-power thermal battery  

Energy Technology Data Exchange (ETDEWEB)

The power requirements for an inverter application were specified to be 500 V at 360 A, or 180 kW per each of six 1-s pulses delivered over a period of 10 minutes. Conventional high-power sources (e.g., flywheels) could not meet these requirements and the use of a thermal battery was considered. The final design involved four, 125-cell, 50-kW modules connected in series. A module using the LiSi/CoS{sub 2} couple and all-Li (LiCI-LiBr-LiF minimum-melting) electrolyte was successfully developed and tested. A power level of over 40 kW was delivered during a 0.5-s pulse. This translates into a specific power level of over 9 kW/kg or 19.2 kW/L delivered from a module. The module was still able to deliver over 30 kW during a 1-s pulse after 10 minutes.

Guidotti, R.A.; Scharrer, G.L.; Binasiewicz, E.; Reinhardt, F.W.

1998-04-01

234

Chemical power supply  

Energy Technology Data Exchange (ETDEWEB)

A chemical power supply comprises a cathode and an anode including active materials dissolved in a electrolyte based on an organic solvent, and a diaphragm for separating the cathode from the anode. The cathode active material is a stable radical selected from the group consisting of a stable cation-radical of an aromatic amine, a stable cation- radical of a heterocyclic compound, a stable electrically neutral radical of an aromatic oxygen- containing compound, a stable electrically neutral radical of an aromatic nitrogen-containing compound, while the anode active material is a stable anion-radical of an aromatic compound.

Pokhodenko, V.; Barchuk, V.; Isagulov, K.; Kallianidis, M.; Kelsey, G.; Koshechko, V.

1983-08-09

235

Inclusion of a high voltage DC-voltage source converter model in a Newton-Raphson power flow algorithm  

Energy Technology Data Exchange (ETDEWEB)

Models for high voltage DC-voltage source converter (HVDC-VSC) controllers suitable for direct incorporation into Newton-Raphson power flow algorithms are presented. The models are developed from first principles, starting with a simple VSC model and progressing to encompass the full HVDC-VSC link model. The applied modelling approach is modular in nature and in addition to the shunt-connected voltage source model, which may be used to represent a STATCOM, a series-connected voltage source model is also developed. This enables significant modelling flexibility since by suitably combining shunt and/or series voltage sources several VSC-based flexible AC transmission system (FACTS) controller models are realised quite straightforwardly, namely the back-to-back HVDC-VSC, the full HVDC-VSC link and the unified power flow controller. Attention is focused on the HVDC-VSC models. The models are implemented into an existing OOP power flow computer program written in C++ that incorporates a wide portfolio of FACTS models. The models are tested for reliability towards the convergence and accuracy of results using several power systems with varying degrees of operational complexity and power flow control requirements (Author)

Angeles-Camacho, C.; Acha, E. [Glasgow Univ., Dept. of Electronics and Electrical Engineering, Glasgow (United Kingdom); Tortelli, O.L. [Federal Univ. of Parana, Dept. of Electrical Engineering, Curitiba, PR (Brazil); Fuerte-Esquivel, C.R. [U.M.S.N.H., Div. de Estudios de Posgrado Cuidad Univ., Facultad de Ingenieria Electrica, San Nicolas de Hidalgo (Mexico)

2003-11-01

236

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

1987-01-01

237

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

Science.gov (United States)

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; Li, Yunlong; Pirjola, Risto

2014-01-01

238

Geomagnetically induced currents in the Uruguayan high-voltage power grid  

Science.gov (United States)

We estimate the influence of the geomagnetically induced currents (GIC) on the Uruguayan electrical distribution grid. The GIC are related to time variations in the geomagnetic field caused by the interaction of the solar wind with the Earth's magnetosphere. These currents may cause several problems in power grids, pipelines, among others. South America is close to the South Atlantic Magnetic Anomaly (SAA). Particle precipitation in the anomaly region could lead to pulsations in the horizontal component of the geomagnetic field, that may contribute to the GIC production. Scarce research has been done to assess the space weather impact on this area. Due to the lack of magnetic field data at the Uruguayan territory, spherical elementary currents system (SECS) was used to interpolate field values with data available from three magnetic observatories located at Vassouras, Trelew and São Martinho da Serra. The simple topology of the Uruguayan power grid provides some advantages in the calculation of GIC. To calculate these currents, a plane wave method combined with a ground conductivity model was used. Estimated GIC suggest peak currents ca. 15 A, at the earthing points of some substations in a 770 km power line during the Halloween Magnetic Storm on 2003 October 29.

Caraballo, R.; Sánchez Bettucci, L.; Tancredi, G.

2013-11-01

239

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2010-01-01

240

RHIC Power Supply Ramp Diagnostics*  

CERN Multimedia

Reliable and reproducible performance of the more than 800 Relativistic Heavy Ion Collider (RHIC) magnet power supplies is essential to successful RHIC operation. In order to support power supply commissioning, a system was developed to capture detailed power supply measurements from all the RHIC ring power supplies during acceleration ramps. Diagnostic tools were developed to allow experts to assess ramp reproducibility and rapidly identify problems. The system has now become a routine part of RHIC operations, with data captured for every acceleration ramp. This paper describes the RHIC power supply ramp diagnostic system and considers its impact on RHIC operations.

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

2001-01-01

 
 
 
 
241

Magnetic fields and cancer in people residing near Swedish high voltage power lines  

Energy Technology Data Exchange (ETDEWEB)

The study was designed as a case-control study, based on the population comprised of everyone who have lived on a property located within 300 meters from any of the 220 and 400 kV power lines in Sweden during the period from 1960 through 1985. For adults it was required that the duration of residence was at least one year. The corridor was chosen to be wide enough to ensure that it included both exposed and unexposed homes. The cases were all instances of cancer diagnosed between 1960-85. For children, all types of cancer were included, while for adults the study was restricted to leukemia and brain tumors. The controls were matched to the cases on time of diagnosis, age, sex, parish, and power line. Exposure was assessed in several different ways. First, spot measurements were performed in the homes of the subjects. Second, the magnetic fields generated by the power lines were calculated by means of a computer program taking distance, line configuration, and load into account. For childhood leukemia and with cut off points at 0.1 and 0.2 [mu]T, the relative risk (RR) increased over the two exposure levels and was estimated at 2.7 (95% c.l.: 1.0-6,3) for 0.2 [mu]T and over. The test for trend gave a p-value of 0.02. When the upper cut off point was shifted to 0.3 [mu]T the RR was instead 3.8 (1.4-9.3) and the corresponding trend test gave a p-value of 0.005. In adults and for magnetic fields of 0.2 [mu]T and over, the RR for acute myeloid (AML) and chronic myeloid leukemia (CML) were estimated at 1.7 (0.8-3.5) and 1.7 (0.7-3.8), respectively. This result persisted in most analyses. For brain tumours no association was seen. The results provide support for the hypothesis that exposure to magnetic fields increase the risk of cancer. This is most evident in childhood leukemia. What aspect of the fields that might be involved remains unclear. (6 figs., 82 tabs., 16 refs.).

Feychting, M.; Ahlbom, A.

1992-01-01

242

Magnetic fields and cancer in people residing near Swedish high voltage power lines  

Energy Technology Data Exchange (ETDEWEB)

The study was designed as a case-control study, based on the population comprised of everyone who have lived on a property located within 300 meters from any of the 220 and 400 kV power lines in Sweden during the period from 1960 through 1985. For adults it was required that the duration of residence was at least one year. The corridor was chosen to be wide enough to ensure that it included both exposed and unexposed homes. The cases were all instances of cancer diagnosed between 1960-85. For children, all types of cancer were included, while for adults the study was restricted to leukemia and brain tumors. The controls were matched to the cases on time of diagnosis, age, sex, parish, and power line. Exposure was assessed in several different ways. First, spot measurements were performed in the homes of the subjects. Second, the magnetic fields generated by the power lines were calculated by means of a computer program taking distance, line configuration, and load into account. For childhood leukemia and with cut off points at 0.1 and 0.2 {mu}T, the relative risk (RR) increased over the two exposure levels and was estimated at 2.7 (95% c.l.: 1.0-6,3) for 0.2 {mu}T and over. The test for trend gave a p-value of 0.02. When the upper cut off point was shifted to 0.3 {mu}T the RR was instead 3.8 (1.4-9.3) and the corresponding trend test gave a p-value of 0.005. In adults and for magnetic fields of 0.2 {mu}T and over, the RR for acute myeloid (AML) and chronic myeloid leukemia (CML) were estimated at 1.7 (0.8-3.5) and 1.7 (0.7-3.8), respectively. This result persisted in most analyses. For brain tumours no association was seen. The results provide support for the hypothesis that exposure to magnetic fields increase the risk of cancer. This is most evident in childhood leukemia. What aspect of the fields that might be involved remains unclear. (6 figs., 82 tabs., 16 refs.).

Feychting, M.; Ahlbom, A.

1992-12-31

243

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

244

Modified optical fiber sensor for PD detection in high-voltage power equipment  

Energy Technology Data Exchange (ETDEWEB)

Detection of electrical partial discharges (PDs) inside power transformers is a good indicator of the quality of the insulation system. Ultrasonic pressure waves are produced by partial discharges and can be detected with suitable pressure transducers. The sensitivity of the externally mounted sensors is reduced due to signal attenuation and multiple paths. Advances in optical fiber technology enable more accurate measurements even in hostile environments with a high background noise level. An all-optical fiber sensor system is investigated as an alternative which can be safely immersed inside the transformer. The perturbation caused by pressure wave induces stress on the fiber core and affects the light beam traversing the fiber. By using interferometric techniques the optical phase shift caused by the perturbation can be detected accurately with a phase-modulated type optical sensor.

Zargari, A.; Blackburn, T.R. [Univ. of New South Wales, Sydney, New South Wales (Australia)

1996-12-31

245

Solid State Remote Power Controllers for high voltage DC distribution systems  

Science.gov (United States)

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

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

1977-01-01

246

High-voltage sheaths and charge neutralization in space power systems  

Science.gov (United States)

The authors examine the electrodynamics of charged platforms in the ionosphere with a variety of analytical and numerical models. These models have been specifically designed to study the tethered satellite system (TSS-1) due to be launched in early 1992. One of the objectives of TSS-1 is to determine the potential of tethers for electrical power generation from orbital motion across the earth's magnetic field. The author identifies and explores important aspects of the interaction between the ambient ionospheric plasma and moving charged orbital platforms: (1) the formation of energetic particles in the wake of a nominally neutral satellite, (2) transient current collection by a highly charged platform, (3) the current closure paths in the ionosphere between multiple polarized platforms, and (4) the conditions for rapid neutralization by enhanced plasma formation in the presence of effluent gases.

Satyanarayana, P.; Chang, Chia-Lie; Drobot, Adam; Papadopoulos, Dennis

1991-01-01

247

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

248

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

Science.gov (United States)

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

Ibuka, Shinji

249

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

250

Switching 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 switching power supplies. The content of the site is divided into four areas: SMPS Basics and Switching Regulators; DC-DC Converters: Charge Pumps, Forwards Converters and Flyback Converters; Inverters, UPS and Hysteresis Curve, and SMPS: Advantages, Disadvantages and Troubleshooting. There is a quiz for each area in the Knowledge Probe area, and the Learning Resources section contains five 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.

2008-09-05

251

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.

2009-02-07

252

The Upgraded CMS Preshower High Voltage System  

CERN Document Server

In March 2012 the high voltage system of the silicon-sensor-based CMS Preshower detector underwent a significant upgrade. In order to increase the granularity of the bias distribution lines, the number of power supplies was doubled and fully configurable distribution boards were developed and installed. These new boards provide much improved flexibility in the powering, necessary to cope with the expected evolution of the 4288 silicon sensors with radiation damage. They also provide measurement of the ~2200 bias-voltage lines that go to the detector, enabling fast identification/diagnosis of any anomalous currents and providing detailed knowledge of the sensor current evolution over time.

Vichoudis, Paschalis

2013-01-01

253

600W uninterruptible power supply  

Energy Technology Data Exchange (ETDEWEB)

Although the mains power supply in western Europe is normally reliable, power failures, transients and noise can cause loss or corruption of data held on personal computers. The design of an uninterruptible power supply system (UPS) based on well proven technology, is described.

Frizell, C.

1988-01-01

254

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

International Nuclear Information System (INIS)

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

2012-12-23

255

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

256

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

Science.gov (United States)

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

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

2012-07-01

257

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

Energy Technology Data Exchange (ETDEWEB)

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)

Watanabe, T. E-mail: watanabe@nfi.co.jp

2000-03-01

258

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)

2000-03-01

259

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

260

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

 
 
 
 
261

900 Watt Vasi Power Supply.  

Science.gov (United States)

A power supply was designed, built and tested. Rated at 900 watts to supply 3-300 watt lamps employed in a single unit with current settings of 4.0 or 6.6 amperes (depending on ambient light and source operating level) it is powered from the runway edge l...

G. C. Doehler

1969-01-01

262

Electron cyclotron heating power supplies on DIII-D  

Energy Technology Data Exchange (ETDEWEB)

The electron cyclotron heating system on DIII-D has been supporting experiments with six gyrotrons. The gyrotrons are connected to three power supplies: two have single modulators, each energizing two gyrotrons, while the third has three modulators that can energize three gyrotrons asynchronously. However, only two gyrotrons can be run synchronously due to the limitation of the high voltage dc power supply providing the input voltage to the modulators. These two configurations mimic proposed architectures of power systems for multiple gyrotron systems and demonstrate their advantages or disadvantages, which will be discussed in more detail. A fourth power system is being built as part of an upgrade to eight gyrotrons. The two future gyrotrons will have depressed collectors. A 1.2 MW gyrotron will be delivered in mid-2011 and the design of a 1.5 MW gyrotron has been initiated. This fourth power supply will have two modulators to independently energize the cathode of each gyrotron. Commercially available high voltage amplifiers will provide the body voltage. It will also have a solid-state crowbar instead of an ignitron crowbar. This power supply is described in more detail, as well as the testing performed on the solid-state crowbar to prove its performance.

Tooker, J.F., E-mail: tooker@gat.com [General Atomics, San Diego, CA (United States); Anastasi, D.D.; Guzman, T.J.; Huynh, P.; McDaniel, W.L.; Pawley, C.J. [General Atomics, San Diego, CA (United States)

2011-10-15

263

Feasibility of an epidemiological study of workers occupationally exposed to high voltage electric fields in the electric power industry. [Effects studied in electric power industry personnel  

Energy Technology Data Exchange (ETDEWEB)

This feasibility study was conducted for the Electric Power Research Institute to investigate the practicality of an epidemiological study on workers occupationally exposed to high voltage electric fields. Identification of a target population to be studied, examination of the various epidemiologic methods which could be undertaken, and cost estimates were the objectives for this study. As an initial step to address these issues, a sample questionnaire was sent to several utility companies. Tentative recommendations regarding possible approaches and specific cost estimtes and time projections have been stated.

Utidjian, H.M.D.

1979-03-01

264

Comparative analysis of wireless systems as alternative to high-voltage power lines for global terrestrial power transmission  

Energy Technology Data Exchange (ETDEWEB)

This paper discusses the problem of creating the global terrestrial power transmission system, the method to analyze alternative systems including such non traditional systems as wireless power transmission systems. From the above discussion it appears that using microwave beam power transmission with an orbital reflector may be more effective in the case of power transportation between two very distant regions on the Earth, right up to the power transportation between two continents.

Smakhtin, A.P.; Rybakov, V.V. [Moscow State Aviation Inst. (Russian Federation)

1996-12-31

265

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

266

SNS Standard Power Supply Interface  

CERN Document Server

The SNS has developed a standard power supply interface for the approximately 350 magnet power supplies in the SNS accumulator ring, Linac and transport lines. Power supply manufacturers are providing supplies compatible with the standard interface. The SNS standard consists of a VME based power supply controller module (PSC) and a power supply interface unit (PSI) that mounts on the power supply. Communication between the two is via a pair of multimode fibers. This PSI/PSC system supports one 16-bit analog reference, four 16-bit analog readbacks, fifteen digital commands and sixteen digital status bits in a single fiber-isolated module. The system can send commands to the supplies and read data from them synchronized to an external signal at up to a 10KHz rate. The PSC time stamps and stores this data in a circular buffer so historical data leading up to a fault event can be analyzed. The PSC contains a serial port so that local testing of hardware can be accomplished with a laptop. This paper concentrates o...

Peng, S; Oerter, B; Smith, J

2001-01-01

267

VEC power supplies - operating experience  

International Nuclear Information System (INIS)

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

1978-12-31

268

Power supply system for negative ion source at IPR  

Energy Technology Data Exchange (ETDEWEB)

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 {approx}5 x 10{sup 12} cm{sup -3}, from which {approx} 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 ({approx}15 to 35kV), and high current ({approx} 15 to 35A). Other attributes are, fast rate of voltage rise (< 5ms), good regulation (< {+-}1%), low ripple (< {+-}2%), isolation ({approx}50kV), low energy content (< 10J) and fast cut-off (< 100{mu}s). The low voltage (LV) supplies required for biasing and providing heating power to the 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 ({approx} 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 and 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, E-mail: agrajit@ipr.res.i [Institute for Plasma Research, Gandhinagar, Gujarat - 382428 (India)

2010-02-01

269

Highly efficient welding power supply  

Science.gov (United States)

The results and findings of an energy efficient welding power development project are presented. The power source developed is to be used for electric arc welding processes in which 3.5 trillion Btu of energy can be saved annually. The power source developed incorporates the use of switch mode power supply techniques in order to convert industrial supply mains to appropriate welding voltages and currents. A series capacitor switch mode power circuit was the circuit technique chosen in order to optimize energy efficiency, costs, reliability, size/weight, and welding performance. Test results demonstrated an effective efficiency (taking into account idle power consumption) of 80 to 91 percent for the energy efficient power source while the conventional types of power sources tested ranged from 41 to 74 percent efficiency. Line power factor was also improved for the energy efficient power source. Field tests indicated additional refinements of weld process performance and power source audible noise emission reduction could be beneficial.

Thommes, J. M.

1980-09-01

270

Standby power supply for motor  

International Nuclear Information System (INIS)

A motor driving a pump of the cooling system of a plant, such as a sodium pump of a nuclear reactor, is located adjacent the plant and is electrically coupled to a synchronous condenser located remote from the plant, and a flywheel forms part of the rotor of the synchronous condenser. When the normal power supply is available the synchronous condenser provides reactive power to the motor, whereas if the normal supply fails, the flywheel drives the synchronous condenser which acts as a generator supplying electrical power to the motor. The system enables the flywheel to be removed from the restricted area around the reactor. (author)

1986-02-03

271

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)

2012-12-04

272

1000 Amp filament power supply  

International Nuclear Information System (INIS)

A 15 V, 1000 A power supply was developed to supply filament power to the Oak Ridge multiple filament rectangular ion source. The power supply can operate steady state or in a pulsed mode to furnish filament heating for the ion source. The power supply is capable of maintaining an idling current to the filaments between extraction pulses to reduce the electron emission and heat dissipation to enhance the lifetime of the filaments. Prior to an ion beam extraction pulse, the filament current is increased from the idling current to full operating current; ion beam extraction commences when the filament emission reaches equilibrium. When the extraction terminates, the filament current is returned to the idling state

1981-10-19

273

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

274

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.)

1980-10-15

275

Design and development of high voltage (DC) sources for the solar array module plasma interaction experiment  

Science.gov (United States)

Two programmable, high voltage DC power supplies were developed as part of the flight electronics for the Solar Array Module Plasma Interaction Experiment (SAMPIE). SAMPIE's primary objectives were to study and characterize the high voltage arcing and parasitic current losses of various solar cells and metal samples within the space plasma of low earth orbit (LEO). High voltage arcing can cause large discontinuous changes in spacecraft potential which lead to damage of the power system materials and significant Electromagnetic Interference (EMI). Parasitic currents cause a change in floating potential which lead to reduced power efficiency. These primary SAMPIE objectives were accomplished by applying artificial biases across test samples over a voltage range from -600 VDC to +300 VDC. This paper chronicles the design, final development, and test of the two programmable high voltage sources for SAMPIE. The technical challenges to the design for these power supplies included vacuum, space plasma effects, thermal protection, Shuttle vibrations and accelerations.

Bibyk, Irene K.; Wald, Lawrence W.

1995-09-01

276

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

277

High-voltage engineering and testing  

CERN Multimedia

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

278

Nuclear power and uranium supply  

International Nuclear Information System (INIS)

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

1986-01-01

279

Laser power supply  

International Nuclear Information System (INIS)

A method of energizing a laser source stimulating flash lamp directly from an ac power line is presented. Uncontrolled diodes couple the anode and cathode of the flash lamp directly to the ac line. The lamp is triggered by a separate triggering circuit which produces its trigger pulse at a predetermined phase of the ac power source. The use of high current carrying controlled rectifiers and large energy storage devices is thereby eliminated. (U.S.)

1975-01-01

280

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

 
 
 
 
281

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

2009-05-01

282

Reactive power compensation in ITER power supply system  

Energy Technology Data Exchange (ETDEWEB)

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.

Jin, Jeong Tae; Hwang, Churl Kew; Oh, Byung Hoon; Lee, Kwang Won; Chang, Dae Sik [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of); Oh, Jong Seok; Choi, Jung Wan [National Fusion Research Institute, Daejeon (Korea, Republic of); Suh, Jae Hak [Pohang Accelerator Laboratory, Pohang (Korea, Republic of)

2009-05-15

283

High-voltage innovations  

Energy Technology Data Exchange (ETDEWEB)

Professor Heinz Schramm of Siemens takes a look at some of the significant developments of recent years in high-voltage SF6 switchgear and examines the likely developments that will improve the performance of this pervasive switching technology. (author)

Schramm, Heinz [Siemens AG Unternehmensbereich KWU, Erlangen (Germany)]|[Siemens AG Unternehmensbereich KWU, Berlin (Germany)

1996-11-01

284

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)

1998-09-07

285

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

286

Restructuring power supply in Germany  

International Nuclear Information System (INIS)

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

2011-01-01

287

A Robust Modular IGBT Power Supply for Fusion Science Applications  

Science.gov (United States)

A present challenge facing the fusion energy community and particularly the ICC community in its support of the main line tokamak program is the ability to generate increased power levels for pulsed magnets, arc plasma sources, radio frequency heating, and current drive schemes, at reasonable cost. Continuous wave (CW) tube based power supplies are typically large and expensive, making them prohibitive for smaller experimental facilities or not cost effective when only pulsed input power is required. Continued research and development of next generation solid state power supplies could allow for multiple applications with a single well developed, low cost module that could be configured in many ways. Eagle Harbor Technologies has developed, built, and tested a modular solid state power supply based on Insulate Gate Bi-polar Transistor (IGBT) technologies. The power supply utilized a modular, low cost, high power IGBT based system that can be assembled in multiple ways to address a wide range of applications. Testing results demonstrating the prototype abilities in both parallel and series configurations and for both high current and/or high voltage operation will be presented. The prototype cost was shown to be significantly lower than older generation power supplies for similar applications. Future work includes upgrading the prototype for increased power levels (> 10 MW).

Ziemba, Timothy; Miller, Ken; Prager, James

2010-11-01

288

Nonthermal Biological Treatments Using Discharge Plasma Produced by Pulsed Power 7. Application of Pulsed High Voltage for Mushroom Culturing  

Science.gov (United States)

Pulsed high voltage was applied to logs used for mushroom culturing to mushroom growth. An experiment was carried out in an attempt to increase shiitake mushroom yield. Results showed that the weight of shiitake mushroom yield was double that of a normal group cropped in a month. Another experiment was performed to estimate the effect of electrical stimulation on the growth of hyphae. Results of that experiment showed a slight influence on the growth of hyphae, and showed some possibilities this method can improve mushroom culturing techniques.

Tsukamoto, Shunsuke; Maeda, Takaaki; Ikeda, Motoyoshi; Akiyama, Hidenori

289

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

1993-05-17

290

An integrated flyback converter for DC uninterruptible power supply  

Energy Technology Data Exchange (ETDEWEB)

An integrated flyback converter performing the combined functions of uninterruptible power supply (UPS) and switch-mode power supply (SMPS) is presented. This converter has a high voltage main power input and a low voltage backup battery input. DC output is obtained form the main input via a flyback converter during normal operation and from the backup battery via another flyback converter when input power fails. High conversion efficiency is achieved in normal, backup, and charging modes as there is only a single dc-dc conversion in each mode. The converter circuit is very simple, with two switching transistors, a relay for mode switching, and a single magnetic structure only. This new design offers substantial improvement in efficiency, size, and cost over the conventional cascade of UPS and SMPS due to single voltage conversion, high frequency switching, and removal of design redundancy. The operation, design, analysis, and experimental results of the converter are presented.

Ma, K.W. [Ericsson Ltd., Quarry Bay (Hong Kong). Energy System Div.; Lee, Y.S. [Hong Kong Polytechnic Univ., Kowloon (Hong Kong). Dept. of Electronic Engineering

1996-03-01

291

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

Energy Technology Data Exchange (ETDEWEB)

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.

Leavitt, G.A.

1977-09-23

292

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

1977-10-29

293

High-voltage engineering  

CERN Multimedia

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

294

High voltage electric bushing  

Energy Technology Data Exchange (ETDEWEB)

A high voltage electric bushing comprises a hollow elongated dielectric weathershed which encloses a high voltage conductor. A collar formed of high volage dielectric material is positioned over the weathershed and is bonded thereto by an interface material which precludes moisture-life contaminants from entering between the bonded portions. The collar is substantially thicker than the adjacent weathershed which it surrounds, providing relief of the electric stresses which would otherwise appear on the outer surface of the weathershed. The collar may include a conductive ring or capacitive foil to further relieve electric stresses experienced by the bushing.

Cookson, A.H.

1980-07-11

295

The German power supply situation  

International Nuclear Information System (INIS)

The first key statement of this paper runs like this: The situation of power supply in Germany basically is good. However, two qualifications should be added: The current situation is still good. Power outages as a consequence of power plant failures of the kind experienced in other countries must not be expected to occur in Germany. German utilities work hard to offer this assurance also for the future. This is where politics comes in with the need to guarantee reliable framework conditions. After deregulation of the electricity market, reregulation resulting from government interventions is becoming potentially more and more problematic. Energy issues remain at the top of the political agenda, e.g. with the amendment to the Power Economy Act. This is a matter involving a variety of questions and projects on the part of legislators which require delicate handling because, in addition to the prices to be paid by consumers, they also involve as the most important factor the continuity of supply. Nuclear power today covers a major part of our baseload supply, in addition to lignite and hard coal which are used mainly in the medium-load range. Supported by the findings of recent studies, such as the dena Study, the Prognos and EWI Energy Report, the problem is how to replace this share reliably, in a way protecting the climate and economically viable, in line with the political conditions stipulating residual electricity outputs of nuclear power plants. Other countries can be seen to pursue different policies in using nuclear power. (orig.)

2005-07-01

296

Linac pulsed quad power supply  

International Nuclear Information System (INIS)

Fermilab is updating the Linac by replacing one-half of the system in order to double the beam energy. Quadrupole magnets are used to focus the proton beam as it travels through the Linac. This paper describes the power supply used to drive the magnets. The pulsed quadrupole supply generates a 2 ms half sine wave pulse flat on top for 450 ?s within +/- 0.2% of the maximum current of 200 amps. The flattop is achieved by a third harmonic circuit added to the resonant discharge circuit. Charge recovery is included in this system with >70% being recovered. A total of four pulsers are powered from one main supply. Remote control systems are used to operate, send, and receive data. Each pulser unit common floats for minimum noise transmission. Safety and minimum noise transmission were factors included in the design of the complete system

1993-05-17

297

TPX power supply design and performance  

International Nuclear Information System (INIS)

TPX will utilize a combination of new and existing AC/DC converter equipment, the latter consisting of the inventory of equipment available at the PPPL site when TPX succeeds TFTR. To make best use of existing facilities, the TFTR (a.k.a., Transrex) converters are applied to the TPX duty when appropriate, but in general the pulse rated, high voltage converters do not match the long pulse, low voltage demand of the load during the plasma burn phase. In the Poloidal Field (PF) system the Transrex converters are suitable for the dynamic operation associated with plasma ramp up and ramp down, but are not well suited to the quasi-steady conditions during plasma burn. In this case a parallel combination of the Transrex converters with new high current, low voltage power supplies is proposed. In the Toroidal Field (TF) system a new dual voltage converter using AC bus transfer is proposed. In the Fast Plasma Position Control (FPPC) system an anti-parallel 12-pulse arrangement of Transrex converters is proposed. This paper presents a description of the design of the converter systems along with preliminary results of simulation studies of the AC/DC converter performance in terms of short circuit, voltage drop, and control

1995-10-01

298

Characterisation of the VELO High Voltage System  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The high voltage system supplies the bias voltage to the 88 silicon sensors which comprise the LHCb Vertex Locator (VELO). This note describes the results of the tests which have been performed on the hardware of the high voltage system of the VELO. Each individual test detailed in this note corresponds to a specific requirement of the system. These requirements arise primarily from ensuring the safety of the silicon sensors and the quality of the data taken from the VELO mo...

Rakotomiaramanana, B.; Parkes, C.; Eklund, L.

2008-01-01

299

Development of PMT high voltage control system for LASCAR detector array at RIBLL  

International Nuclear Information System (INIS)

It is described in this paper that the multi-channel PMT high voltage power supply control system, which matches with the PMT high voltage module CC123 of the LASCAR detector array at RIBLL experiment terminal. The MCU AT89C51 is selected as the central control part and other suitable accessories are also adopted in our design. The PMT control system of the detector array works steadily and effectively in out performance test of LASCAR detector array. (authors)

2005-09-01

300

Compact high voltage battery  

Energy Technology Data Exchange (ETDEWEB)

A high voltage, low impedance laminar battery comprising a stack of series connected cells confined under pressure in a housing is described. The cells comprise laminar anodes, cathodes and separators. The cells are connected in series by laminar conductive intercell connectors. An annular spacer is associated with each cell. The spacers are separated by interdigitated ones of the separators and intercell connectors.

Kinsman, G.F.; Land, E.H.

1980-03-18

 
 
 
 
301

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

302

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

303

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

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

2008-01-01

304

Klystron bias power supplies for Indus-2 synchrotron radiation source  

International Nuclear Information System (INIS)

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

2008-01-01

305

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)

2001-12-21

306

High voltage system design for the IUCF 300 KV electron cooling system  

Energy Technology Data Exchange (ETDEWEB)

A summary of the electron beam high voltage system design for the IUCF Cooler now under construction, is presented. There are extremely stringent regulation requirements (about 10ppm) on the main high voltage power supply (-300 kVDC, 15 mA), and less stringent requirements on the gun anode power supply, in order to achieve the regulation needed to store beams in the IUCF Cooler with very low momentum spreads (..delta..p/p approx. = 2 x 10/sup -5/). An overview of the main high voltage power supply (HVPS) specifications and design, as well as provisions and plans to improve the regulation are discussed. The electron collection system, modeled after the FNAL collector which was able to collect between 99.9% and 99.99% of the electron beam, is discussed along with the requirements of the associated power supplies. The designs of the high voltage acceleration structures and high voltage platform are discussed, as well as practical design considerations based upon experience with the Fermilab 120 keV electron cooling system.

Bertuccio, T.; Brown, B.; Donica, G.; Ellison, T.; Friesel, D.L.

1985-10-01

307

High voltage system design for the IUCF 300 KV electron cooling system  

International Nuclear Information System (INIS)

A summary of the electron beam high voltage system design for the IUCF Cooler now under construction, is presented. There are extremely stringent regulation requirements (about 10ppm) on the main high voltage power supply (-300 kVDC, 15 mA), and less stringent requirements on the gun anode power supply, in order to achieve the regulation needed to store beams in the IUCF Cooler with very low momentum spreads (?p/p approx. = 2 x 10"-"5). An overview of the main high voltage power supply (HVPS) specifications and design, as well as provisions and plans to improve the regulation are discussed. The electron collection system, modeled after the FNAL collector which was able to collect between 99.9% and 99.99% of the electron beam, is discussed along with the requirements of the associated power supplies. The designs of the high voltage acceleration structures and high voltage platform are discussed, as well as practical design considerations based upon experience with the Fermilab 120 keV electron cooling system

1985-10-01

308

High voltage system design for the IUCF 300 kV electron cooling system  

International Nuclear Information System (INIS)

A summary of the electron beam high voltage system design for the IUCF Cooler, now under construction, is presented. There are extremely stringent regulation requirements (?10ppm) on the main high voltage power supply (-300 kVDC, 15 mA), and less stringent requirements on the gun anode power supply, in order to achieve the regulation needed to store beams in the IUCF Cooler with very low momentum spreads (?p/p ? 2 x 10"-"5). An overview of the main high voltage power supply (HVPS) specifications and design, as well as provisions and plans to improve the regulation are discussed. The electron collection system, modeled after the FNAL collector which was able to collect between 99.9% and 99.99% of the electron beam, is discussed along with the requirements of the associated power supplies. The designs of the high voltage acceleration structures and high voltage platform are discussed, as well as practical design considerations based upon experience with the Fermilab 120 keV electron cooling system

1985-05-13

309

High Voltage Connector  

Energy Technology Data Exchange (ETDEWEB)

The originally designed high voltage connectors were to be made of brass. However, if treated like a Bellevile spring with the initially given dimensions, the stresses of the connector when crimped were calculated to be much higher than the yield stress of brass. Since the flange and outer diameters of the connector are to remain small, it was necessary to alter the other dimensions and choice of material in order to bring down the stresses applied to the connector.

Kurita, C.H.; /Fermilab

1987-03-06

310

Insulators for high voltages  

Energy Technology Data Exchange (ETDEWEB)

This book describes electrical insulators for high voltage applications. Topics considered include the insulating materials, the manufacture of wet process porcelain, the manufacture of tempered glass, the glass-fibre core, the polymeric housing, the common problem - terminating an insulator, mechanical constraints, the physics of pollution flashover, the physics of contamination, testing of insulators, conclusions from testing, remedies for flashover, insulators for special cases, interference and noise, and the insulator of the future.

Looms, J.S.T.

1987-01-01

311

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

1989-01-01

312

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

313

A comparison of magnetic fields inside and outside high-voltage urban 110-kV power substations with the exposure recommendations of the Ukrainian regulatory authorities  

International Nuclear Information System (INIS)

The aim of this study was to carry out theoretical investigations of power frequency magnetic fields (MFs), produced inside and outside the domain of urban 110-kV power substations and to establish a correspondence between the levels of the fields and the specified population limits as defined by Ukrainian regulations. The fields produced by high-voltage substations were studied based on the application of the numerical finite element methodology. The investigations have shown that magnetic flux density values calculated inside and outside the considered 110-kV power substations do not reach the exposure limits specified by the Ukrainian regulations (1750 ?T) and by international guidelines (ICNIRP 2010). Inside the domain of the substation, the maximum value of MFs was found under the 10-kV bus-bars and it equalled 420 ?T. (authors)

2013-05-01

314

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.

2009-01-01

315

The calculation and simulation of the ECRH HV power supply for the HL-2A tokamak  

International Nuclear Information System (INIS)

In order to satisfy the requirement of ECRH, the ECRH HV power supply (ECHV-HVPS) on the base of high voltage pulse modulation has been designed. The filter inductance in the ECHV-HVPS is much smaller than the voltage regulation power supply. Modulations are adopted in the power supply, so the short time of the leading edge and lagging edge of the pulse is achieved. The main circuit of the ECHV-HVPS is showed. The equivalent resistance and the transient response of the PS are calculated and analyzed using MATLAB, and experiment results are given. (authors)

2006-12-01

316

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2013-10-15

317

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

International Nuclear Information System (INIS)

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

2013-10-01

318

Design and Development of High Voltage Direct Current (DC) Sources for the Solar Array Module Plasma Interaction Experiment  

Science.gov (United States)

Two programmable, high voltage DC power supplies were developed as part of the flight electronics for the Solar Array Module Plasma Interaction Experiment (SAMPIE). SAMPIE's primary objectives were to study and characterize the high voltage arcing and parasitic current losses of various solar cells and metal samples within the space plasma of low earth orbit (LEO). High voltage arcing can cause large discontinuous changes in spacecraft potential which lead to damage of the power system materials and significant Electromagnetic Interference (EMI). Parasitic currents cause a change in floating potential which lead to reduced power efficiency. These primary SAMPIE objectives were accomplished by applying artificial biases across test samples over a voltage range from -600 VDC to +300 VDC. This paper chronicles the design, final development, and test of the two programmable high voltage sources for SAMPIE. The technical challenges to the design for these power supplies included vacuum, space plasma effects, thermal protection, Shuttle vibrations and accelerations.

Bibyk, Irene K.; Wald, Lawrence W.

1995-01-01

319

High Voltage SPT Performance  

Science.gov (United States)

A 2.3 kW stationary plasma thruster designed to operate at high voltage was tested at discharge voltages between 300 and 1250 V. Discharge specific impulses between 1600 and 3700 sec were demonstrated with thrust between 40 and 145 mN. Test data indicated that discharge voltage can be optimized for maximum discharge efficiency. The optimum discharge voltage was between 500 and 700 V for the various anode mass flow rates considered. The effect of operating voltage on optimal magnet field strength was investigated. The effect of cathode flow rate on thruster efficiency was considered for an 800 V discharge.

Manzella, David; Jacobson, David; Jankovsky, Robert

2001-01-01

320

High voltage engineering  

Energy Technology Data Exchange (ETDEWEB)

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

Kuffel, E.

1984-01-01

 
 
 
 
321

A Robust Modular IGBT Power Supply for Configurable Series/Parallel Operation at High Power and Frequency  

Science.gov (United States)

Eagle Harbor Technologies (EHT) is developing a modular, solid-state power supply for pulsed high power (> 10 MW) RF applications supported by a DOE SBIR Phase II. The prototype modules utilize a low-cost IGBT based system that can be assembled in multiple ways for a wide range of applications. Each module is capable of switching 2 kA at 1 kV up to megahertz frequencies with rise times of ˜40 ns. Experimental testing of the modules demonstrated both parallel (high current) and series (high voltage) configurations. The modules are designed for precise switching control, which reduces jitter (IGBT based power supplies for similar high current pulsed applications and twenty times less for the pulsed high voltage and high power tube based RF applications.

Ziemba, Timothy; Miller, K. E.; Prager, J. R.; Carscadden, J. G.

2011-11-01

322

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

323

Power generator with high-voltage charging of a shaping line by means of electrical explosion wires  

International Nuclear Information System (INIS)

A new scheme of creating high-power and heavy-current nanosecond generator is suggested. It includes a low-voltage (U 2.5 ?s) powered inductive accumulator, interrupter on the basis of electrical explosion wires, fast shaping lines, transmitting line with vacuum diode at the end. This circuit enables to design and to put into operation the sub-terawatt generator with ? 100 kG initial energy content, which supported the main assumptions and ideas. 6 refs., 5 figs

1995-12-01

324

Operational experience with a klystron 50kV/30kW inverter power supply  

International Nuclear Information System (INIS)

We have developed an inverter type high-voltage power supply for an oil-filled klystron modulator. The power module produces 38-kJ/sec peak and 30 kJ/sec average power at a 50-kV output voltage. It drives a 1:16 step-up transformer to deliver -350 kV to a 50-MW C-band (5712-MHz) klystron. We obtained an output voltage regulation of around 0.34% (3?) at 50-kV. So far our experience with the inverter power supply has shown probable adequate long run reliability. (author)

2005-07-01

325

Performance analysis and design optimization of a self-powered gate-driver supply circuit  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this paper, the performance of a self-powered unipolar gate driver supply circuit for power devices is studied, with the aim of analyzing the viability of using such circuits in high voltage applications with discrete components. A simplified model of the circuit, capturing the essential features, is proposed, from which practical design guidelines are provided to optimize the overall circuit performance. These design guidelines allow a proper component selection that ...

Busquets Monge, Sergio; Boroyevich, Dushan; Burgos, Rolando; Chen, Zhen

2010-01-01

326

High voltage variable diameter insulator  

Energy Technology Data Exchange (ETDEWEB)

A high voltage feedthrough assembly having a tubular insulator extending between the ground plane ring and the high voltage ring. The insulator is made of Pyrex and decreases in diameter from the ground plane ring to the high voltage ring, producing equipotential lines almost perpendicular to the wall of the insulator to optimize the voltage-holding capability of the feedthrough assembly.

Vanacek, D.L.; Pike, C.D.

1982-07-13

327

Void-Free Bonded SOI Substrates for High-Voltage, High-Current Vertical DMOS-Type Power ICs  

Science.gov (United States)

New isolated structures for intelligent power ICs were developed using a wafer bonding technique. These structures have partial buried oxide films for dielectric isolation and buried poly-Si layers for wafer bonding. In this bonding technique, bonding surfaces are a poly-Si layer and a crystalline silicon surface; this combination of bonding surfaces leads to void-free bonding. The electrical perfection of the vertical output device in the new structure was obtained by diffusing antimony into the poly-Si layer. These results indicate that intelligent power ICs can be manufactured by using the new structure.

Hamajima, Tomohiro; Kobayashi, Kenya; Kikuchi, Hiroaki; Okonogi, Kensuke; Arai, Kenichi; Ninomiya, Yasuhito; Takahashi, Mitsuasa

1995-02-01

328

Power supply design for Hadron Facility  

Energy Technology Data Exchange (ETDEWEB)

Recently, a study investigated the feasibility of building a large 60 GeV, kaon factory accelerator. This paper presents the conceptual design of the magnet power supplies and energy storage system. In this study the following three systems were investigated: (a) power supply using storage generator; (b) power supply using inductive storage device; and (c) resonant power supplies. These systems were analyzed from both technical and economical points of view. It was found that all three systems are feasible and can be built using commercially available components. From a technical point of view, the system using inductive storage is the most advantageous. The resonant power supply is the most economical solution.

Karady, G.; Kansog, J.; Thiessen, H.A.; Schneider, E.

1987-01-01

329

Fast quadrupole pulsed power supply in the AGS  

Energy Technology Data Exchange (ETDEWEB)

As part of the Polarized Proton Project at the AGS, a pulsed power supply system has been developed to energize a set of twelve fast quadrupoles which are symmetrically distributed around the 1/2-mile circumference of the machine. During a typical acceleration cycle, which is normally repeated every 2.4 s, these magnets are energized with bursts of triangular current pulses. The rise-time of each pulse is less than 2 ..mu..s and the width at the base varies from 1 to 3.5 ms depending on the pulse. Within a burst, pulses alternate in polarity and vary in amplitude from 160 A to 2700 A peak. Pulse separation is on the order of 40 ms. Due to the distributed nature of the load and high di/dt, each magnet is powered by a separate modulator. Magnets are driven via coaxial pulse transmission cables up to 200 ft long. In the modulators, the high power pulses are switched with thyratron/ignitron switch pairs. All modulators are charged in parallel with a common system of programmable high voltage power supplies. The overall system is controlled with a distributed network of microcomputers. This paper describes the development, construction and initial performance of the pulsed power supply system.

Nawrocky, R.J.; Halama, H.J.; Lambiase, R.F.; Montemurro, P.A.

1984-01-01

330

Design of a switchable low-noise power supply  

International Nuclear Information System (INIS)

Triga-trap aims at mass measurements of heavy ions and neutron-rich fission products. Such on-line mass measurements using small-band and broad-band FT-ICR in this setup, also allowing for the traditional TOF-ICR method, are particularly challenging. The voltages applied to the trap's electrodes must be switched within the order of 100 ns for capture and optional ejection, while remaining stable with low noise during the detection of image currents. Switching requires a supply with high power output, but comparatively long idle time with constant trapping voltage does not warrant a fully-featured amplifier. The double-headed approach to the problem capitalizes on these peculiarities to design a power supply specially tailored to the needs of on-line FT-ICR detection. An electronic switch is at the heart of the power supply. The precision output voltage in the range of ±200 V is set by a regulator operating a push-pull stage with its own high-voltage supply. The principle of each component and first results is presented

2009-03-02

331

Low voltage power supply for HCAL photodetectors in CMS  

CERN Multimedia

The compact muon solenoid (CMS) is one of the detectors for the new large hadron collider (LHC) of CERN. Because of the high level magnetic field inside CMS specialized photodetectors - hybrid photo diodes (HPDs) are used in its hadron calorimeter (HCAL). For their normal operation HPDs need two supply voltages - one high voltage of about 10 kV and a bias voltage from 50 up to 200 V. Because of some specific requirements as very low output noise, very weak load current (10 mu A), high precision measurement of the load current etc., a new linear mode voltage stabilizer is used as bias voltage power supply. The base distinction of the device is that a current mirror is included in its input, providing a precise measurement of the load current without any electrical contact with the output line. This feature is very important because about 500 power supplies of this type are included in the total HPD power supply system of the HCAL subdetector and can not be local earthed. (3 refs).

Kunov, B; Dimitrov, L

2003-01-01

332

-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)

2008-10-13

333

Crowbarless solid state modular HV power supply  

International Nuclear Information System (INIS)

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

2006-11-01

334

Cockcroft-Walton high voltage generator  

CERN Document Server

Cockcroft-Walton generator (or voltage doubler)(600kV) built by Philips and used in the Linac experimental area of the proton synclotron south hall (1964).Served as high voltage supply for the pre-injector of the 3Mev experimental Linac.

1964-01-01

335

High voltage feedthrough bushing  

Energy Technology Data Exchange (ETDEWEB)

A feedthrough bushing for a high voltage diode provides for using compression sealing for all sealing surfaces. A diode assembly includes a central conductor extending through the bushing and a grading ring assembly circumferentially surrounding and coaxial with the central conductor. A flexible conductive plate extends between and compressively seals against the central conductor and the grading ring assembly, wherein the flexibility of the plate allows inner and outer portions of the plate to axially translate for compression sealing against the central conductor and the grading ring assembly, respectively. The inner portion of the plate is bolted to the central conductor for affecting sealing. A compression beam is also bolted to the central conductor and engages the outer portion of the plate to urge the outer portion toward the grading ring assembly to obtain compression sealing therebetween.

Brucker, J.P.

1991-12-31

336

High voltage feedthrough bushing  

Energy Technology Data Exchange (ETDEWEB)

A feedthrough bushing for a high voltage diode provides for using compression sealing for all sealing surfaces. A diode assembly includes a central conductor extending through the bushing and a grading ring assembly circumferentially surrounding and coaxial with the central conductor. A flexible conductive plate extends between and compressively seals against the central conductor and the grading ring assembly, wherein the flexibility of the plate allows inner and outer portions of the plate to axially translate for compression sealing against the central conductor and the grading ring assembly, respectively. The inner portion of the plate is bolted to the central conductor for affecting sealing. A compression beam is also bolted to the central conductor and engages the outer portion of the plate to urge the outer portion toward the grading ring assembly to obtain compression sealing therebetween.

Brucker, John P. (Espanola, NM)

1993-01-01

337

Battery backup system for switched power supply  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a battery back-up system for an alternating current powered switched power supply, the power supply producing a direct current output, the power supply including a voltage regulator circuit, and the battery back-up system serving to maintain the direct current output from the power supply in the event of an alternating current power interruption, the back-up system including: a battery; terminal means connected to the battery; a battery charging circuit; first circuit means connecting the inpout of the charging circuit to the power supply for causing the power supply to energize the charging circuit during normal operation of the power supply. Second circuit means connect the output of the battery charging circuit to the terminal means for supplying a charging current to the battery during normal operation for the power supply. Third circuit means connect the battery to the input of the voltage regulator circuit, the third circuit means including blocking means for causing the battery to supply power to the input of the voltage regulator circuit only when the voltage of the power supply drops below a predetermined level. A fan is for cooling the power supply. Circuitry connects the fan to the output of the battery charging system to energize the fan during normal operation of the power supply and connects the fan to the terminal means to energize the fan from the battery during alternating current power interruptions. An under-voltage detector connects the terminal means for disconnecting the fan during alternating current power interruptions but only when the battery voltage drops below a particular minimum threshold.

Swoboda, J.W.

1987-06-09

338

Optical control, diagnostic and power supply system for a solid state induction modulator  

Energy Technology Data Exchange (ETDEWEB)

A new high speed optical control, diagnostic and power supply system has been developed for a solid state induction modulator. The modulator consists of a large array of field effect transistors (FETs) that switch a high-voltage pulse across a tape-wound magnetic core. The FETs within the modulator are mounted on numerous circuit boards that are stacked in series for high-voltage operation. The new optical system overcomes the issue of voltage isolation by supplying each circuit board with optically coupled control power and high bandwidth signal information. An optical fiber is used to transmit laser light to a custom photovoltaic cell that provides dc power to the on-board control circuits. Optical fiber technology is again used to convey a pulse that contains detailed analog features to the FET gate controls. Diagnostic data and status information are also obtained from each board by similar optical methods. 8 refs., 6 figs., 1 tab.

Saethre, R. [Bechtel Nevada Corp., Las Vegas, NV (United States); Kirbie, H.; Hickman, B.; Lee, B.; Ollis, C. [Lawrence Livermore National Lab., CA (United States)

1997-06-01

339

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

340

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)

2008-08-01

 
 
 
 
341

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

International Nuclear Information System (INIS)

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

2001-10-03

342

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.)

1987-01-01

343

High-voltage vacuum lead-in  

Energy Technology Data Exchange (ETDEWEB)

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

Vintizenko, L.G.

1986-06-01

344

Monitoring System for Uninterruptible Power Supply  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

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

2007-01-01

345

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

International Nuclear Information System (INIS)

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

1986-01-01

346

Completely explosive ultracompact high-voltage nanosecond pulse-generating system  

Science.gov (United States)

A conventional pulsed power technology has been combined with an explosive pulsed power technology to produce an autonomous high-voltage power supply. The power supply contained an explosive-driven high-voltage primary power source and a power-conditioning stage. The ultracompact explosive-driven primary power source was based on the physical effect of shock-wave depolarization of high-energy Pb(Zr52Ti48)O3 ferroelectric material. The volume of the energy-carrying ferroelectric elements in the shock-wave ferroelectric generators (SWFEGs) varied from 1.2 to 2.6 cm3. The power-conditioning stage was based on the spiral vector inversion generator (VIG). The SWFEG-VIG system demonstrated successful operation and good performance. The amplitude of the output voltage pulse of the SWFEG-VIG system exceeded 90 kV, with a rise time of 5.2 ns.

Shkuratov, Sergey I.; Talantsev, Evgueni F.; Baird, Jason; Rose, Millard F.; Shotts, Zachary; Altgilbers, Larry L.; Stults, Allen H.

2006-04-01

347

The high-voltage monitor system for the calorimeter of the OBELIX experiment  

Energy Technology Data Exchange (ETDEWEB)

We describe the monitor system developed to manage the high voltage power supply for the electromagnetic calorimeter of the OBELIX experiment, installed on the LEAR facility at CERN. The hardware and software characteristics of the system are discussed, as well as the performance of the same. (orig.)

Bertin, A. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); Bruschi, M. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); Capponi, M. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); Cereda, B. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); D' Antone, I. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); De Castro, S. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); Galli, D. (Dipartimento di Fisica dell' Universita di Bologna and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (Italy)); Giacobbe, B. (Dipartimento di Fisica dell' Univers

1993-10-01

348

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

2009-05-01

349

Airport power supply system. Kukoyo dengen system  

Energy Technology Data Exchange (ETDEWEB)

This paper describes summary and features of the power supply system installed at the Narita International Airport. The 66-kV power receiving and transforming facility at the central air conditioning facility handles the regional air conditioning facilities to supply cold and hot waters to passenger and cargo terminal buildings and the airport railway station for air conditioning. The power receiving and transforming facility receiving power constantly via two lines is a completely duplicated system that ensures trouble-free power supply even with only one main transformer operating. The 6-kV system stand-by power generation facility works as an emergency power supply for facilities in the airport that operate on 6 kV. Four generators are operating in parallel to supply power. Six switching stations have been installed to transmit and branch off the 6-kV power supply to distribute the 6-kV power from the central receiving and distributing station to small-size facilities. Upon a utility power failure, the system activates load limiting function to supply emergency power only to critical facilities for the airport operation. The supply is performed upon an operation command from the central monitoring facility at the central power receiving and distributing station. 10 figs.

Abe, T.; Yoshida, H. (Fuji Electric Co. Ltd., Tokyo (Japan))

1993-06-10

350

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

351

Bulk water distribution power supply failures  

Directory of Open Access Journals (Sweden)

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

2011-04-01

352

Development of high performance magnet power supply  

International Nuclear Information System (INIS)

It is always necessary to high performance power supplies for the magnet system in the accelerator, especially when the number of power supplies are large. We have developed the compact power supply using switching technology instead of SCR phase control. We adopt the pulse width modulation (PWM) method with a half bridge DC/DC converter. In this way, we can make a compact system with light weight and small volume. Actual system we developed 1.2 kW, 35V/35A bipolar DC power supply into the current precision of +/-0.02%. It is possible to mount 10 units in conventional 19'' rack. The built-in controller has an RS422 protocol to drive 10 unit by one serial port up to 1.2 km distance. It we adopt RS485 protocol, one serial port can control 32 power supplies. In the paper, we report the design and performance of the prototype power supply. (author)

1998-11-01

353

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.

Nel, D T; Haarhoff, J.

354

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)

1995-01-01

355

Bulk water distribution power supply failures  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

Nel, D. T.; Haarhoff, J.

2011-01-01

356

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

357

High voltage variable diameter insulator  

Energy Technology Data Exchange (ETDEWEB)

A high voltage feedthrough assembly (10) having a tubular insulator (15) extending between the ground plane ring (16) and the high voltage ring (30). The insulator (15) is made of Pyrex and decreases in diameter from the ground plane ring (16) to the high voltage ring (30), producing equipotential lines almost perpendicular to the wall (27) of the insulator (15) to optimize the voltage-holding capability of the feedthrough assembly (10).

Vanecek, David L. (Martinez, CA); Pike, Chester D. (Pinole, CA)

1984-01-01

358

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

359

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

Science.gov (United States)

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

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

1989-01-01

360

The JT-60 NBI power supply system  

International Nuclear Information System (INIS)

The design of the JT-60 NBI power supply system is based on our experience with the prototype injector unit. The power supply system is composed of 14 units, one for each injector unit. Each power supply unit is similar to that of the prototype unit but with some modifications. Two new features are, 1) the application of voltage regulated GTO valve in the accel power supply instead of a vacuum tube, and 2) the capability of beam energy change during a pulse. The feature 1) gives higher system efficiency. The latter will drastically alter the NBI control concept

1985-01-01

 
 
 
 
361

The JT-60 NBI power supply system  

International Nuclear Information System (INIS)

The design of the JT-60 NBI power supply system is based on experience with the prototype injector unit. The power supply system is composed of 14 units, one for each injector unit. Each power supply unit is similar to that of the prototype unit but with some modifications. Two new features are, 1) the application of voltage regulated GTO valve in the accel power supply instead of a vacuum tube, and 2) the capability of beam energy change during a pulse. The feature 1) gives higher system efficiency. The latter will drastically alter the NBI control concept. (author)

1984-01-01

362

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.)

1981-01-01

363

CONCEPTUAL DESIGN STUDY OF HORN POWER SUPPLY.  

Energy Technology Data Exchange (ETDEWEB)

A 250 kA pulsed power supply is required for the focusing horn of the proposed Brookhaven AGS Super Neutrino Beam Facility for long baseline neutrino oscillation experiment. It is expected to pulse at 2.5 Hz repetition rate. A preliminary study is being conducted to explore the key issues associated with the power supply system design. Advanced technologies used in similar systems as well as new ideas are being examined, simulated and evaluated. This power supply will be a very high stored energy, high average power, and high peak power system.

ZHANG,W.; SANDBERG,J.; WENG,W.T.

2003-06-16

364

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

2001-04-19

365

Upgrading the TFTR Transrex Power Supplies  

Energy Technology Data Exchange (ETDEWEB)

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

J. E. Lawson, R. Marsala, S. Ramakrishnan, X. Zhao, P. Sichta

2009-05-29

366

Upgrading the TFTR Transrex Power Supplies  

International Nuclear Information System (INIS)

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

2009-06-05

367

Engineering Design of the ITER AC/DC Power Supply System  

Energy Technology Data Exchange (ETDEWEB)

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

Oh, B. H.; Lee, K. W.; Chang, D. S.; Jin, J. T.; Hwang, C. K.

2010-02-15

368

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

2010-01-01

369

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.)

1981-01-01

370

Temperature controlled high voltage regulator  

Energy Technology Data Exchange (ETDEWEB)

A temperature controlled high voltage regulator for automatically adjusting the high voltage applied to a radiation detector is described. The regulator is a solid state device that is independent of the attached radiation detector, enabling the regulator to be used by various models of radiation detectors, such as gas flow proportional radiation detectors.

Chiaro, Jr., Peter J. (Clinton, TN); Schulze, Gerald K. (Knoxville, TN)

2004-04-20

371

Neutrino horn power supply operational experience  

International Nuclear Information System (INIS)

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

1987-03-16

372

Development of power supply for 'JT-60'  

International Nuclear Information System (INIS)

The power source for the tokamak type critical plasma test system (JT-60) was designed, and the characteristic feature was investigated. The power source is that for plasma generation with a DC thyristor breaker. The thyristors used are CF05V (2000V, 500A) and CA02 (4000V, 800A). The test of the thyristor breaker was performed. A result showed that the break was successful at the breaking current of 6.17 kA and the recovery voltage of 12.3 kV. Various circuits for current transformer power source were proposed and studied. Two circuits, which are a parallel type and a multiple repetition type, were accepted. Choice of the best one should be made according to the practical condition. Tests with the mini-models of the circuits were performed. High voltage was generated at every break of the breaker with both circuits. (Kato, T.)

1978-01-01

373

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

374

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

International Nuclear Information System (INIS)

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

2013-10-01

375

High Voltage System for the CMS Electromagnetic Calorimeter  

CERN Multimedia

The CMS electromagnetic calorimeter (ECAL) is made of about 75000 lead tungstate crystals. The 61200 crystals of the barrel part are read by avalanche photodiodes (APD) with internal amplification of the signal. Since the gain strongly depends on the bias voltage, the APDs require a very stable power supply system. To preserve the high energy resolution of the calorimeter, a stability of the bias voltage of the order of 10^-4 is required over several months, a typical interval between absolute calibrations of the full read-out chain with physics events. This paper describes the High Voltage power supply system developed for CMS ECAL and its performances as measured in laboratory tests and during test-beam operations of several modules of the calorimeter.

Bartoloni, Alessandro; Cavallari, Francesca; Dafinei, Ioan; Del Re, Daniele; Diemoz, Marcella; Guerra, Sergio; Longo, Egidio; Meridiani, Paolo; Organtini, Giovanni; Palma, Alessandro; Paramatti, Riccardo; Pellegrino, Fabio; Rahatlou, Shahram; Rovelli, Chiara; Santanastasio, Francesco

2007-01-01

376

Upgrade of the Nuclotron power supply  

International Nuclear Information System (INIS)

One of topics of the Nuclotron development is the modification of its power supply scheme and upgrade of the energy evacuation system aimed to provide long and safe operation of the Nuclotron at the dipole magnetic field up to 2 T. It is necessary for the Nuclotron operation as a part of injection chain of the heavy ion collider under design at JINR as well as for fulfillment of its current scientific program. In the report the structure and peculiarity of the existing power supply system are described. The existing system is based on separated supply of dipole magnets and quadrupole lenses. General goals of the power supply modification are described, structural and principal schemes of the power supply, control system and the schemes of the energy evacuation key are presented

2009-09-05

377

A crowbarless power supply for klystrons.  

Science.gov (United States)

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

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

1998-05-01

378

High voltage testing and monitoring  

Energy Technology Data Exchange (ETDEWEB)

The existing standards for high voltage testing and measuring techniques were discussed with particular emphasis on the need to correlate high voltage tests in the laboratory with on-site monitoring. More insulation monitoring was considered essential, as well as correct interpretations of the measured quantities. High voltage tests on-site were introduced for special apparatus such as cables and SF{sub 6} installations where parts of the equipment must be assembled on-site. Monitoring is important to establish adaptive maintenance and to increase the lifetime of an apparatus. 1 fig.

Feser, K. [Stuttgart Univ. (Germany)

1997-12-31

379

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. [...

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

380

Development of 70kV, 22A DC power supply for High Power RF and microwave tubes  

Energy Technology Data Exchange (ETDEWEB)

Our institute (IPR) is involved in the development of High Power RF and Microwave sources for various fusion related heating and current drive applications. All the high power RF and microwave tubes e.g. Klystron, Gyrotron tetrode etc need a high voltage DC power supply to deliver the required high power with necessary protections. To cater to the initial testing and commissioning requirements, the development of 70kV, 22A power supply is initiated. The supply ratings are chosen to meet general tube requirements i.e. Klystron, Gyrotron and Tetrode used in RF group. The supply would be a part of test facility, rather than a regular supply for use in an experiment. Hence some ripple and regulation requirements are relaxed to optimize the cost. However all protections including crowbar protection are accommodated. This supply when ready enables continuous full power testing of TH 2103D Klystrons, GLGD-82.6/0.2 Gyrotron and short time (3Sec-{sup ON}, 120Sec-{sup OFF}) full power testing of 1.5MW Tetrode. This paper presents analysis of requirements of various tubes, power supply rating optimization, topology selection, protection requirements and other facilities required. Remote monitoring through DAC and remote control requirement from various locations, are highlighted. Present status of development is mentioned.

Srinivas, Y S S; Babu, Rajan; Makwana, Azad; Parmar, Kirit; Kulkarni, S V, E-mail: srinivas@ipr.res.i [Institute for Plasma Research, BHAT, Gandhinagar-382 428 (India)

2010-02-01

 
 
 
 
381

Development of 70kV, 22A DC power supply for High Power RF and microwave tubes  

Science.gov (United States)

Our institute (IPR) is involved in the development of High Power RF and Microwave sources for various fusion related heating and current drive applications. All the high power RF and microwave tubes e.g. Klystron, Gyrotron tetrode etc need a high voltage DC power supply to deliver the required high power with necessary protections. To cater to the initial testing and commissioning requirements, the development of 70kV, 22A power supply is initiated. The supply ratings are chosen to meet general tube requirements i.e. Klystron, Gyrotron and Tetrode used in RF group. The supply would be a part of test facility, rather than a regular supply for use in an experiment. Hence some ripple and regulation requirements are relaxed to optimize the cost. However all protections including crowbar protection are accommodated. This supply when ready enables continuous full power testing of TH 2103D Klystrons, GLGD-82.6/0.2 Gyrotron and short time (3Sec-"ON", 120Sec-"OFF") full power testing of 1.5MW Tetrode. This paper presents analysis of requirements of various tubes, power supply rating optimization, topology selection, protection requirements and other facilities required. Remote monitoring through DAC and remote control requirement from various locations, are highlighted. Present status of development is mentioned.

Srinivas, Y. S. S.; Babu, Rajan; Makwana, Azad; Parmar, Kirit; Kulkarni, S. V.; Rf Group

2010-02-01

382

Three-phase current transformer rectifier sets. High-voltage power supplies for difficult conditions in electrostatic precipitators  

Energy Technology Data Exchange (ETDEWEB)

The precipitation rate of electrostatic precipitators (ESP) highly depends on the consistency of waste gas. Among other things, electrical conductivity plays an important role as well as the ability of particles to be electrically charged or ionised. Within certain limits, common ESPs are able to clean waste gas satisfactorily. If the dust attributes exceed these limits, more sophisticated technical solutions are required in the ESP to meet the demands for the gas cleaning equipment. In these cases, a three phase transformer rectifier system offers an alternative to the conventional single phase system, as it delivers a smooth direct current voltage over a wide voltage range. (orig.)

Stackelberg, Josef von [Rico-Werk Eiserlo und Emmrich GmbH, Toenisvorst (Germany)

2013-04-01

383

Power flow and efficiency in supplying systems of arc plasma generators  

International Nuclear Information System (INIS)

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

1998-01-01

384

Output voltage control in power supplies with dc to ac transformation  

International Nuclear Information System (INIS)

Two methods of controlling the output voltage of high-voltage power supplies are described which are based on varying the power of the output stage. The variation of power was accomplished: 1) by periodic cut-out of the output stage; 2) by varying the average repetition frequency of the pulses which start the output stage. The following circuits are described: 1) a current source 0.3=10 mA at voltages 1-15 kV; 2) a generator producing voltage pulses having an amplitude 8-15 kV and a repetition frequency 1-60 Hz

1975-11-01

385

High voltage lightning grounding device  

Science.gov (United States)

Grounding device insertion in wire termination cabinets and terminal block modification prevent lightning-induced high voltage transients from reaching inputs or outputs of solid state instruments and control systems. Installation minimizes wiring confusion and achieves 100 percent protection.

Hoffman, R. G.; Peterson, V. S.

1971-01-01

386

Power Regulatory Framework & Opportunities for Self Supply  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The intention of a single energy market in Europe is to have a sustainable, competitive, and secure supply of energy. However, the current rise in the cost of electricity supply is affecting the competitiveness of large industrial users. This has led large electricity consumers to look for new ways to supply themselves with electricity. An important alternative to reduce power cost and avoid using electricity from the grid is self generation from a renewable energy source. The proposed paper ...

Finger, Matthias; Trevino, Luis

2008-01-01

387

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

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)

1997-01-01

389

Novel piezoelectric transducers for high voltage measurements  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

Va?zquez Carazo, Alfredo

2000-01-01

390

Optically triggered high voltage switch network and method for switching a high voltage  

Energy Technology Data Exchange (ETDEWEB)

An optically triggered solid state switch and method for switching a high voltage electrical current. A plurality of solid state switches (350) are connected in series for controlling electrical current flow between a compensation capacitor (112) and ground in a reactive power compensator (50, 50') that monitors the voltage and current flowing through each of three distribution lines (52a, 52b and 52c), which are supplying three-phase power to one or more inductive loads. An optical transmitter (100) controlled by the reactive power compensation system produces light pulses that are conveyed over optical fibers (102) to a switch driver (110') that includes a plurality of series connected optical triger circuits (288). Each of the optical trigger circuits controls a pair of the solid state switches and includes a plurality of series connected resistors (294, 326, 330, and 334) that equalize or balance the potential across the plurality of trigger circuits. The trigger circuits are connected to one of the distribution lines through a trigger capacitor (340). In each switch driver, the light signals activate a phototransistor (300) so that an electrical current flows from one of the energy reservoir capacitors through a pulse transformer (306) in the trigger circuit, producing gate signals that turn on the pair of serially connected solid state switches (350).

El-Sharkawi, Mohamed A. (Renton, WA); Andexler, George (Everett, WA); Silberkleit, Lee I. (Mountlake Terrace, WA)

1993-01-19

391

Control units for APS power supplies  

Energy Technology Data Exchange (ETDEWEB)

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.

Despe, O.D.; Saunders, C.; McGhee, D.G.

1993-07-01

392

Power supply strategy in Lithuania  

International Nuclear Information System (INIS)

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

2000-06-19

393

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. 3 refs., 3 figs., 1 tab

1991-05-06

394

Wireless Power Transmission for Power Supply: State of Art  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The wireless power supply is motivated by simple and comfortable use of many small electric appliances with low power input. This paper reviews the concepts which are suitable for wireless power transmission with respect to power supply of such appliances in small areas. The categorization of the concepts is made. The efficiency of the concepts is discussed on general base. The reference levels for exposure to electric and magnetic fields are mentioned, and maximal power delivered to an appli...

Kracek, J.; Mazanek, M.

2011-01-01

395

PEP magnet power supply systems  

International Nuclear Information System (INIS)

The dc electrical requirements of the PEP magnets fall mainly into two categories: (1) high power and current of single polarity and (2) 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

1977-03-18

396

Design of 500 kV/20 mA power supply for the electron beam machine accelerating voltage  

International Nuclear Information System (INIS)

The 500 kV/20 mA high voltage power supply for the electron beam machine accelerating voltage has been designed. The HV power supply is a Cocroft-Walton type and it's main components are voltage multiplier is designed using 20 stage of 0.22 ?F/50 kV capacitor and IN 4007 diodes. The power oscillator is designed using ITK 15-2 triode and the power supply for the oscillator is designed using 3-phase transformer. The design shows that the voltage multiplier has input voltage of 12.814 kV, power last of 503 want and input power of 12.6 kW. The power which must be supplied by power oscillator is 17.2 kW. (author)

1999-07-01

397

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

1991-11-05

398

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

399

ISABELLE magnet power supply system performance analysis  

International Nuclear Information System (INIS)

The power supply system that will energize the superconducting magnets in the ISABELLE 400 x 400 GeV accelerator must supply various voltages and currents. The voltages for the correction winding range from ten to one hundred twenty-five volts unipolar and bipolar with current rating of 50 to 300 amperes. The main field winding requires voltages from 90V (at flattop) to 600V during maximum ramp rate or acceleration cycle. The power supplies are programmable over their full range of output current with a reproducibility error varying from +- 10 ppM to +- 400 ppM of full scale. Included within the reproducibility error are the long and short term stability requirements of the power supplies. The purpose of this paper is to define some of the design goals and outline the approach taken in reaching these goals

1981-03-13

400

An accurate continuous calibration system for high voltage current transformer  

Energy Technology Data Exchange (ETDEWEB)

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.

Tong Yue; Li Binhong [College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province (China)

2011-02-15

 
 
 
 
401

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.

2011-02-01

402

77 FR 39745 - Fuel Oil Systems for Emergency Power Supplies  

Science.gov (United States)

...NRC-2012-0159] Fuel Oil Systems for Emergency Power Supplies AGENCY: Nuclear...DG-1282, ``Fuel Oil Systems for Emergency Power Supplies.'' This guide...entitled, ``Fuel Oil Systems for Emergency Power Supplies,'' is...

2012-07-05

403

Multi-cell power supply  

Energy Technology Data Exchange (ETDEWEB)

The present invention relates to a portable electrical power source comprising housing means adapted to fit within a cell cavity of a battery-powered device, said housing means having positive and negative electrical contact means adapted to form electrical connection with corresponding positive and negative contact means of said device; a plurality of button cells disposed within said housing means, at least one of said button cells being electrically connected to said contact means and at least 50 percent of said button cells being insulated from any electrical connection to said contact means.

Kelm, R. W.; McArthur, W. J.; Merry, G. W.

1985-08-13

404

Dc power supplies and hard-tube power conditioning systems  

Energy Technology Data Exchange (ETDEWEB)

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

Sarjeant, W.J.

1980-01-01

405

Innovative use of power integrated modules for DC power supplies  

DEFF Research Database (Denmark)

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

�rndrup Nielsen, Rasmus; Elkiær, Alexander

2013-01-01

406

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

407

Lead-Oxygen DC Power Supply System.  

Science.gov (United States)

A pollution-free, closed-loop electrical power system using a lead-oxygen battery to supply power for lightweight vehicles is described. The battery system is completely sealed and no outgassing occurs during operation. The system consists of the lead-oxy...

W. J. Britz W. A. Boshers J. J. Kaufmann

1974-01-01

408

Basic technology of synchrotron power supply  

International Nuclear Information System (INIS)

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

1995-01-01

409

CMS uniform low voltage power supply system  

CERN Multimedia

Some problems of the CMS front-end-electronics low voltage power supply are discussed in. The most serious of them was the very significant power losses in the connecting low voltage cables. There was shown that these losses could be minimize by using a three stage power supply system, in which an intermediary stage, mounted on the CMS detector periphery, is included. During the last two years this idea is developed and modified. New equipments for the first end second stage are proposed, evaluated and tested. On this base an uniform low voltage system for all CMS subdetectors is accepted now and will be described below. (11 refs).

Vankov, I

2003-01-01

410

Current topics in high voltage engineering  

Energy Technology Data Exchange (ETDEWEB)

Recent trend of research and future of high voltage (HV) engineering are reviewed. ISH, International Symposium HV engineering, is the only one international meeting in th field of HV engineering and this was started in 1972 participated by 18 countries. Since then, worldwide research works regarding HV engineering are presented in this meeting. The topics discussed here are numerical field calculation by computer aided design (CAD) and computer aided engineering (CAE), laser induced lightning or discharge, high voltage tests standards, gas insulated switchgears (GIS)-gas insulation diagnostics, new application of gas insulation (DC gas insulation), gas-insulated transformers and so forth. So far the HV engineering has been closely related to HV raising AC or DC voltage in commercial power system. However, at present together with the power transmission, innovative technologies in regard to materials, equipment, environment, and analytical fields are getting attention. 3 tabs.

Takuma, T. (Central Research Inst. of Electric Power Industry, Tokyo (Japan))

1993-11-20

411

Further development on high voltage, high current static generator DISKTRON for MeV ion implanter  

International Nuclear Information System (INIS)

For the purpose of fulfilling the power supply requirements for the high voltage ion implanter and other ion accelerators, a compact and high power 1MV generator ''Disktron'' has been constructed. The principle of power generation in the Disktron is similar to that of the pellet chain type. However, in compactness and high output power, Disktron excels others. The output of 1mA at 1MV was successfully achieved recently. The whole Disktron system, including 5 KVA motor generator and other high voltage sections, is put in a cylindrical pressure vessel filled with SF_6 gas (8.5Kg/cm"2). The overall dimensions of the pressure vessel are 100 cm PHI X 240 cm L. The structure of the Disktron, the mechanism of power generation and the stability of output voltage and current are presented. (author)

1985-05-01

412

DA?NE magnet power supply system  

International Nuclear Information System (INIS)

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

1998-07-01

413

Legal nature of power supply contracts  

Energy Technology Data Exchange (ETDEWEB)

The Higher Regional Court of Frankfurt has found for the plaintiff, a public utility suing a liquidator for payment of electricity supplied before opening bankrupt proceedings on the grounds that these are bankrupt estate liabilities under sections 59 subsection 1 No. 2, 57 bankrupty law (KO). At the same time, it has given an opinion on the legal nature of power supply contracts at standard rates. The court refuses to recognize a so-called recurving contractual obligation but proceeds on the assumption of a uniform permanent contractual obligation within the meaning of paragraph III No. 2 of the general supply conditions then valid. The senate has admitted the appeal which was also lodged, and pointed out: 'It seems adequate that the dispute over the legal nature of general power supply contracts be settled by the Federal High Court (BGH) of the Federal Republic of Germany'.

1982-03-01

414

Economic aspects concerning reactive power compensation in high voltage electric power transmission system; Aspectos economicos de compensacao de potencia reativa em sistema de transmissao de alta tensao  

Energy Technology Data Exchange (ETDEWEB)

This work describes basic properties as well as specific costs for the different equipment for reactive power compensation. An analysis of the different alternatives is performed. Finally, a case study for a 500 kV electric power transmission line is presented 6 figs., 1 tab

Ehmcke, B.; Kahnt, R.; Lemes, M.N.

1987-12-31

415

High power fast ramping power supplies  

Energy Technology Data Exchange (ETDEWEB)

Hundred megawatt level fast ramping power converters to drive proton and heavy ion machines are under research and development at accelerator facilities in the world. This is a leading edge technology. There are several topologies to achieve this power level. Their advantages and related issues will be discussed.

Marneris,I.; Bajon, E.; Bonati, R.; Sandberg, J.; Roser, T.; Tsoupas, N.

2009-05-04

416

A high voltage test stand for electron gun qualification for LINACs  

International Nuclear Information System (INIS)

An electron gun lest stand has been developed at RRCAT. The test stand consists of a high voltage pulsed power supply, electron gun filament supply, grid supply, UHV system and electron gun current measurement system. Several electron guns developed indigenously were evaluated on this test stand. The shielding is provided for the electron gun set up. Electron gun tests can be tested upto 55 kV with pulse width of 15 microsecs and pulse repetition rates up to 200 Hz. The technical details of the subsystems are furnished and results of performance of the test stand have been reported in this paper. (author)

2011-02-21