WorldWideScience
1

High voltage DC power supply  

Science.gov (United States)

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

2

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)

3

Modular high voltage power supply for chemical analysis  

Science.gov (United States)

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

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

2008-07-15

4

Modular high voltage power supply for chemical analysis  

Science.gov (United States)

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

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

2010-05-04

5

High-voltage power supply based on piezoelectric transformer  

OpenAIRE

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

Kryvoshei, Dmytro; Paerand, Yuriy

2012-01-01

6

Intense neutron source: high-voltage power supply specifications  

International Nuclear Information System (INIS)

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

7

Intense neutron source: high-voltage power supply specifications  

Energy Technology Data Exchange (ETDEWEB)

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

Riedel, A.A.

1980-08-01

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)

9

E-beam high voltage switching power supply  

Science.gov (United States)

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

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

1996-01-01

10

A New Transformer for High Voltage Charging Power Supply  

Directory of Open Access Journals (Sweden)

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

Jianming Liu

2013-09-01

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

12

DIII-D ICRF high voltage power supply regulator upgrade  

International Nuclear Information System (INIS)

For reliable operation and component protection, of the 2 MW 30--120 MHz ICRF Amplifier System on DIII-D, it is desirable for the amplifier to respond to high VSWR conditions as rapidly as possible. This requires a rapid change in power which also means a rapid change in the high voltage power supply current demands. An analysis of the power supply's regulator dynamics was needed to verify its expected operation during such conditions. Based on this information it was found that a new regulator with a larger dynamic range and some anticipation capability would be required. This paper will discuss the system requirements, the as-delivered regulator performance, and the improved performance after installation of the new regulator system. It will also be shown how this improvement has made the amplifier perform at higher power levels more reliably

13

High Voltage Power Supply Design Guide for Space  

Science.gov (United States)

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

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

2006-01-01

14

High voltage power supply with modular series resonant inverters  

Science.gov (United States)

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

15

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

16

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

Science.gov (United States)

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

Bearden, Douglas B. (Inventor)

2007-01-01

17

Multi-phase, 2-kilowatt, high-voltage, regulated power supply.  

Science.gov (United States)

Development of a flight configured experimental power supply delivering 2 kw of conditioned power represents a concentrated effort at advancing the state-of-the-art in high voltage power supplies for space application. The power supply described herein was designed for use with the Jet Propulsion Laboratory (JPL) 20 cm Mercury Ion Thruster. However, its modularized design philosophy allows adaptation to various high voltage, high power requirements. Areas of principal concern are design of power and control circuits, performance parameters, packaging, efficiency, and weight.

Garth, D. R.; Muldoon, W. J.; Benson, G. C.; Costague, E. N.

1971-01-01

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)

19

A novel high voltage start up circuit for an integrated switched mode power supply  

International Nuclear Information System (INIS)

A novel high voltage start up circuit for providing an initial bias voltage to an integrated switched mode power supply (SMPS) is presented. An enhanced mode VDMOS transistor, the gate of which is biased by a floating p-island, is used to provide start up current and sustain high voltage. An NMOS transistor having a high source to ground breakdown voltage is included to extend the bias voltage range to the SMPS. Simulation results indicate that the high voltage start up circuit can start and restart as designed. The proposed structure is believed to be more energy saving and cost-effective compared with other solutions. (semiconductor devices)

20

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

Scientific Electronic Library Online (English)

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

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

2013-04-01

21

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.

22

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

23

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

International Nuclear Information System (INIS)

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

24

Structure Design and Analysis of High-Voltage Power Supply for ECRH  

Science.gov (United States)

In order to develop a high-voltage power supply (HVPS) with high quality parameters, not only its electrical circuit but also its structure should be studied in detail. In this paper, the structure design of the collector power supply for gyrotron is discussed first. Then the electrical field and potential simulations of its main devices are analyzed. Finally, relevant calculations and conclusions are given.

Wang, Lei; Huang, Yiyun; Zhao, Yanping; Zhang, Jian; Yang, Lei; Guo, Wenjun

2014-11-01

25

Development of anode high voltage power supply system for ECRH of HL-2A tokamak  

International Nuclear Information System (INIS)

The anode high voltage power supply system consist of DC high-voltage power supply (HVPS) and pulse modulator. SCR is used to vary AC input voltage of the step-up transformer by controlling the trigger phase in the HVPS, and regulate the DC output voltage linearly at the potential of low-end via BJT, Dual closed-loop control technology is applied in the controller, and its maximum output is at 30kV and 130mA. Tetrode is the core component of the modulator. The circuit design is optimized by using the simulation software. Test and HL-2A discharge experimental results show that the power supply system is designed with some characteristics of output scale widely, low ripple and modulate quickly. (authors)

26

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

International Nuclear Information System (INIS)

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

27

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

International Nuclear Information System (INIS)

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

28

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

29

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

30

Optimization of a high voltage power supply for a nitrogen laser  

International Nuclear Information System (INIS)

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

31

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

32

Charging System of ECRH High-Voltage Power Supply and its Control System  

Science.gov (United States)

High-voltage power supply (HVPS) of Electron Cyclotron Resonance Heating (ECRH) for HT-7 and HT-7U is presently being constructed. The high voltage (100 kV) energy of HVPS is stored in the capacitor banks, and they can power one or two gyrotrons. All the operation of the charging system will be done by the control system, where the field signals are interfaced to programmable logic controller (PLC). The use of PLC not only simplifies the control system, but also enhances the reliability. The software written by using configuration software installed in the master computer allows for remote and multiple operator control, and the status and data information is also remotely available.

Hu, Guofu; Ding, Tonghai; Liu, Baohua; Jiang, Shufang

2003-08-01

33

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

International Nuclear Information System (INIS)

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

34

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

International Nuclear Information System (INIS)

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

35

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

International Nuclear Information System (INIS)

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

36

Negative-feedback control system of the high voltage power supply for ECRH  

International Nuclear Information System (INIS)

A kind of high accuracy negative high voltage power supply (HVPS) was introduced. The serial feedback was regulated according to the character of the high power tetrode and a new kind of integrator with preset value, which solved the key technological problem of the HVPS that the ECRH system required a voltage of -80 kV, a pulse width of 10 - 100 ms and a precision of 99.7%. The result using a PSPICE code simulation has shown that the method is practical

37

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

38

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

CERN Document Server

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

Swoboda, D; CERN. Geneva

2000-01-01

39

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

Science.gov (United States)

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.

Ghazali, A. B.; Ahmad, T. S.; Abdullah, N. A.

2013-06-01

40

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

International Nuclear Information System (INIS)

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

41

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

42

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

43

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)

44

Online high voltage power supply ripple estimation and feedforward in LEDA  

Energy Technology Data Exchange (ETDEWEB)

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.

Kwon, S.; Regan, A.; Wang, Y.M.; Rohlev, T.

1999-06-01

45

A high voltage power supply for GM detectors with logic level control  

International Nuclear Information System (INIS)

A high voltage power supply circuit has been designed for use in hand monitors employing G.M detectors. The power supply can adopt two stable output voltage values on the application of the two standard TTL levels, namely, '1' and '0' to its control input. The need for such a system arises from the requirement that the voltage on the G.m tubes is to be maintained at about 250V below their operating voltage in the 'stand by' condition and then taken up to the operating voltage only for the duration (approx. 15 sec) when the hands are actually being monitored. Such an arrangement enhances considerably the useful life of the G-M tubes. (author)

46

100 kV repetition-rate high-voltage pulsed power supply  

International Nuclear Information System (INIS)

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

47

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

International Nuclear Information System (INIS)

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

48

Regulated high voltage power supply for gyrotrons based on pulse step modulator technology  

International Nuclear Information System (INIS)

The Regulated High Voltage Power Supply (RHVPS) which energizes the gyrotrons used in the Electron Cyclotron Resonance Heating (ECRH) system of TCV is based on the Pulse Step Modulator (PSM) technology. The RHVPS [1-2] is designed to minimize active and reactive losses, and to insure an easy operation with high reliability, and low maintenance. RHVPS based on PSM technology has a high energy conversion factor (95%) and a low rejection of harmonics in the power grid. A crowbar is not necessary due to the high reliability and the very fast switch-off of the high voltage of the system. The modular conception minimizes the number of spare parts. The RHVPS is extremely compact (less than 200 m3 for a 6.5 MW unit). For operation at low duty cycle (as in our case, 1%), no cooling is required. The design of the RHVPS will be discussed and the results of the factory tests on a resistive load are presented. (orig.)

49

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

Science.gov (United States)

A proposed multiloop power supply would generate a potential as high as 1.25 kV with rise and fall times high voltages and high slew rates are needed. At the time of reporting the information for this article, there was no commercially available power supply capable of satisfying the stated combination of voltage, rise-time, and fall-time requirements. The power supply would include a preregulator that would be used to program a voltage 1/30 of the desired output voltage. By means of a circuit that would include a pulse-width modulator (PWM), two voltage doublers, and a transformer having two primary and two secondary windings, the preregulator output voltage would be amplified by a factor of 30. A resistor would limit the current by controlling a drive voltage applied to field-effect transistors (FETs) during turn-on of the PWM. Two feedback loops would be used to regulate the high output voltage. A pulse transformer would be used to turn on four FETs to short-circuit output capacitors when the outputs of the PWM were disabled. Application of a 0-to-5-V square to a PWM shut-down pin would cause a 20-to-1,250-V square wave to appear at the output.

Bearden, Douglas

2007-01-01

50

A high voltage pulsed power supply for capillary discharge waveguide applications  

Science.gov (United States)

We present an all solid-state, high voltage pulsed power supply for inducing stable plasma formation (density ˜1018 cm-3) in gas-filled capillary discharge waveguides. The pulser (pulse duration of 1 ?s) is based on transistor switching and wound transmission line transformer technology. For a capillary of length 40 mm and diameter 265 ?m and gas backing pressure of 100 mbar, a fast voltage pulse risetime of 95 ns initiates breakdown at 13 kV along the capillary. A peak current of ˜280 A indicates near complete ionization, and the r.m.s. temporal jitter in the current pulse is only 4 ns. Temporally stable plasma formation is crucial for deploying capillary waveguides as plasma channels in laser-plasma interaction experiments, such as the laser wakefield accelerator.

Abuazoum, S.; Wiggins, S. M.; Issac, R. C.; Welsh, G. H.; Vieux, G.; Ganciu, M.; Jaroszynski, D. A.

2011-06-01

51

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

52

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

53

Proposed high voltage power supply for the ITER relevant lower hybrid current drive system  

Energy Technology Data Exchange (ETDEWEB)

In the framework of the EFDA task HCD-08-03-01, the ITER lower hybrid current drive (LHCD) system design has been reviewed. The system aims to generate 24 MW of RF power at 5 GHz, of which 20 MW would be coupled to the plasmas. The present state of the art does not allow envisaging a unitary output of the klystrons exceeding 500 kW, so the project is based on 48 klystron units, leaving some margin when the transmission lines losses are taken into account. A high voltage power supply (HVPS), required to operate the klystrons, is proposed. A single HVPS would be used to feed and operate four klystrons in parallel configuration. Based on the above considerations, it is proposed to design and develop twelve HVPS, based on pulse step modulator (PSM) technology, each rated for 90 kV/90 A. This paper describes in details, the typical electrical requirements and the conceptual design of the proposed HVPS for the ITER LHCD system.

Sharma, P.K., E-mail: pramod@ipr.res.in [Institute for Plasma Research, Bhat, Gandhinagar, Gujarat (India); Kazarian, F.; Garibaldi, P.; Gassman, T. [ITER Organization, CS 90 046, 13067 Saint-Paul-Les-Durance (France); Artaud, J.F. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Bae, Y.S. [National Fusion Research Institute, Daejeon (Korea, Republic of); Belo, J. [Associacao Euratom-IST, Centro de Fusao Nuclear, Lisboa (Portugal); Berger-By, G.; Bernard, J.M.; Cara, Ph. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Cardinali, A.; Castaldo, C.; Ceccuzzi, S.; Cesario, R. [Associazione Euratom-ENEA sulla Fusione, CR Frascati, Rome (Italy); Decker, J.; Delpech, L.; Ekedahl, A.; Garcia, J.; Goniche, M.; Guilhem, D. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France)

2011-10-15

54

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

55

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

OpenAIRE

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.

Mariun, N.; Ismail, D.; Anayet, K.; Khan, N.; Amran, M.

2006-01-01

56

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

CERN Document Server

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

Cours, A

2004-01-01

57

Software control program for 25 kW breadboard testing. [spacecraft power supplies; high voltage batteries  

Science.gov (United States)

A data acquisition software program developed to operate in conjunction with the automated control system of the 25 kW PM Electric Power System Breadboard Test facility is described. The proram provides limited interactive control of the breadboard test while acquiring data and monitoring parameters, allowing unattended continuous operation. The breadboard test facility has two positions for operating separate configurations. The main variable in each test setup is the high voltage Ni-Cd battery.

Pajak, J. A.

1981-01-01

58

Design and realization of the protection system of high-voltage power supply of the EAST low hybrid current drive  

International Nuclear Information System (INIS)

Design and realization of the protection system of high-voltage power supply of the EAST low hybrid current drive are described, in which the over-current in main circuit and tube body, and the over-current and over-voltage in the high-voltage circuit are considered as the basic protection parameters for the system. Consequently, the crowbar will protect the klystron by transferring the fault current when the over-current takes place in the main circuit and tube body. (authors)

59

High voltage power supply system for pulsed CO2 lasers used in thermonuclear research  

International Nuclear Information System (INIS)

The requirements to be met by power supply systems of pulsed CO2 lasers are discUssed. The design of power supply units on the base of capacitive generators is shown. A capacitive supplying generator consists of pulse capacitorr, spark gaps, trigger system of spark gaps and connection units. The way of synchronization of several generators operating as a multimodular system is considered

60

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.)

61

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

OpenAIRE

In this work we characterized a variable high voltage DC power supply, designed and constructed for low pressure gas discharge, suitable for laser pumping and plasma production. A homemade transformer was performed to obtain maximum output voltage of 30 KV and current variation of 100 mA which is required for laser production and plasma creation. A mixture of CO2, N2 and He was tested with different pressures and variable flow rates for discharge evaluation and parameters validation. The peak...

Abdelbagi, A. M.; Almuslet, N. A.

2011-01-01

62

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)

63

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

International Nuclear Information System (INIS)

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

64

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

65

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

International Nuclear Information System (INIS)

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

66

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

Energy Technology Data Exchange (ETDEWEB)

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

Li Xiaodong [Southwestern Institute of Physics, Chengdu, Sichuan (China); Mutoh, T.; Kumazawa, R.; Watari, T.; Seki, T.; Shimpo, F.; Nomura, G.; Saito, K.

1999-04-01

67

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

International Nuclear Information System (INIS)

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

68

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

OpenAIRE

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 sm...

Siravo, U.; Alex, J.; Bader, M.; Carpita, M.; Fasel, D.; Gavin, S.; Perez, A.

2011-01-01

69

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

70

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.

71

Adjustable stabilized high-voltage power supply of 500 V to 2 kV, 2 mA, with integrated circuit  

International Nuclear Information System (INIS)

A block diagram is shown of a high-voltage power source comprising a d-c converter operating as a high-voltage generator and supplied via a control stage consisting of integrated circuit MAA 723 from a 15 V stabilized low-voltage source. A description is presented of the mains part, control stage, converter, rectifier and filter. The properties of the high-voltage stabilized power supply are given. The output voltage is continuously adjustable within 500 V and 2 kV using a potentiometer. The current drawn from the low-voltage source is load-dependent and ranges approx. between 0.2 and 0.8 amp. The output voltage stability depends on the low-voltage source stability. The temperature shift is given by the temperature coefficient of the control stage circuit. The described high-voltage stabilized power supply fully meets the requirements for scintillation detector supply. (J.P.)

72

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

International Nuclear Information System (INIS)

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

73

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

International Nuclear Information System (INIS)

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

74

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

International Nuclear Information System (INIS)

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

75

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

76

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

Directory of Open Access Journals (Sweden)

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

A.M. Abdelbagi

2011-12-01

77

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

International Nuclear Information System (INIS)

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

78

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

Energy Technology Data Exchange (ETDEWEB)

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

Tripathi, V; Singh, N P; Gupta, L N; Oza, Kapil; Patel, Paresh; Baruah, U K [Institute for Plasma Research (IPR), Bhat, Gandhinagar 382428 (India)

2010-02-01

79

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

Energy Technology Data Exchange (ETDEWEB)

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

Myhre, Joergen Chr.

2001-07-01

80

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

81

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

International Nuclear Information System (INIS)

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

82

A 2-Megawatt load for testing high voltage dc power supplies  

Energy Technology Data Exchange (ETDEWEB)

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

Horan, D.; Kustom, R.; Ferguson, M.; Primdahl, K.

1993-06-01

83

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

International Nuclear Information System (INIS)

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

84

Computer control of the high-voltage power supply for the DIII-D electron cyclotron heating system  

International Nuclear Information System (INIS)

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

85

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 nd 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

86

High-voltage nanosecond pulse generator with GIN-500-0.02/5 for streamer chamber power supply  

International Nuclear Information System (INIS)

A high-voltage nanosecond pulse generator for a 2 m streamer chamber and track spark chambers supply is described. The generator comprises a pulse generator for charging a double shaping line based on the commercial GIN-500-0.02/5. Transformer oil was used for insulation of main gaps of the charge generator; a pulse with the amplitude up to 500 kV and duration of 12.0 ns is shaped at the matched load of the line (38 Ohm) in this case. Utilization of nitrogen instead of transformer oil permits to shape a pulse with the amplitude up to 300 kV at the given load. In the first case the service life of the generator made up to 105 triggerings, in the second case it constituted 5x104

87

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

Directory of Open Access Journals (Sweden)

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

BOUBKAR BAHANI

2014-10-01

88

A 600kV 15mA Cockcroft-Walton high-voltage power supply with high stability and low-ripple voltage  

International Nuclear Information System (INIS)

A Cockcroft-Walton high-voltage power supply with high stability and low-ripple voltage has been developed. This power supply has been operated in a ns pulse neutron generator. The maximum non-load voltage is 600kV while the working voltage and load current are 550kV and 15mA, respectively. The tested results indicate that when the power supply is operated at 300kV, 6.7mA and the input voltage varies +/-10%, the long-term stability of the output voltage is S=(0.300-1.006)x10-3. The ripple voltage is ?UP-P=6.2V at 300kV, 6.8-8.3mA and the ratio of ?UP-P to the output voltage VH is ?UP-P/VH=2.1x10-5

89

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

International Nuclear Information System (INIS)

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

90

Low power, scalable multichannel high voltage controller  

Science.gov (United States)

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

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

2008-03-25

91

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 andoperated scintillation-type detectors and BF3-type neutron detectors with excellent results. (author)

92

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

International Nuclear Information System (INIS)

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

93

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

94

Packaging of high voltage power semiconductor modules  

Science.gov (United States)

As the breakdown voltage capability of power semiconductor devices increases, new methods have become necessary to facilitate these devices in the packaging of high voltage power semiconductor modules. Silicon carbide has been hailed as one of the successors to silicon power semiconductor devices due to its wide bandgap, low on-state resistance, and high operating temperature, among others. As the breakdown voltage of the next generation of silicon carbide devices pass the 10kV threshold, new packaging schemes must be utilized to take full advantage of these devices. This thesis investigates a direct attachment packaging scheme and the use of benzocyclobutene (BCB) as a substrate passivation layer for the high-voltage silicon carbide power module. A discussion on the physics of breakdown through gasses and solids is presented as well as simulations for determining electric field strength in a high voltage module. The processing steps required to coat a direct bond copper substrate with BCB are detailed in addition to materials selection and fabrication procedures necessary to construct the final high voltage module. Final testing resulted in a module capable of blocking up to 6.3 kV without failure.

Evans, Tristan

95

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)

96

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

97

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)

98

High voltage mass impregnated power cable  

Energy Technology Data Exchange (ETDEWEB)

A high voltage mass impregnated power cable is modified to be used on land and in shallow waters by including in the cable construction a pressure body consisting of a number of pressure tapes applied in several layers on a bedding between the metal sheath and the tapes. The pressure body ensures that under all load conditions including no-load, the internal pressure on the cable insulation is above atmospheric pressure and high enough to prevent creation of voids in the insulation.

Johnsen, J.N.

1989-12-05

99

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

Energy Technology Data Exchange (ETDEWEB)

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.

Fernandez, A. [Laboratorio Nacional de Fusion, EURATOM-CIEMAT Association, Avda. Complutense 22, 28040 Madrid (Spain)], E-mail: angela.curto@ciemat.es; de la Fuente, J.M.; Ganuza, D. [Grupo JEMA, Paseo del Circuito 10, 20160 Lasarte-Oria (Spain); Kirpitchev, I.; Alonso, J. [Laboratorio Nacional de Fusion, EURATOM-CIEMAT Association, Avda. Complutense 22, 28040 Madrid (Spain); Garcia, F. [Grupo JEMA, Paseo del Circuito 10, 20160 Lasarte-Oria (Spain); Ascasibar, E. [Laboratorio Nacional de Fusion, EURATOM-CIEMAT Association, Avda. Complutense 22, 28040 Madrid (Spain); del Rio, J.M.; Garcia, I. [Grupo JEMA, Paseo del Circuito 10, 20160 Lasarte-Oria (Spain); Ros, A.; Alvarez, P.; Tolkachev, A.; Catalan, G. [Laboratorio Nacional de Fusion, EURATOM-CIEMAT Association, Avda. Complutense 22, 28040 Madrid (Spain)

2009-06-15

100

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2011-09-15

101

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

102

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

International Nuclear Information System (INIS)

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

103

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

104

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

105

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

106

Power high-voltage pulse transformer  

International Nuclear Information System (INIS)

In detail the design of a power high-voltage transformer is discussed. Basic formulae for calculation of electromagnetic and design parameters, and values of pulse-shape distortions in the transformer are presented. The transformer core is made of the Eh360 steel and has the most efficient square section. The core, together with gaskets and rings, is fastened to the tank cover, thus forming a removable part which is placed into an oil tank. The tank cover carries low- and high-voltage insulators coupled with the secondary winding. The tank and its cover form a single-loop winding; insulation between the windings is the transformer oil. All tank elements and its cover are made of aluminium alloys and have a thickness of 8-12 mm. Sector gaskets and rings are made of organic glass having a thickness of 10-12 mm. The proposed design of a pulse transformer provides minor distortions of pulses with a voltage of up to 1 MV at a power of up to 10 GW. The recommended range of pulse durations is from 1 to 10 ?s. The developed power transformer is used for experiments on the acceleration of charged particles

107

Power supply  

Science.gov (United States)

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

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

2007-12-04

108

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

109

High voltage supply for neutron tubes in well logging applications  

Science.gov (United States)

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

Humphreys, D. Russell (Albuquerque, NM)

1989-01-01

110

A quick response four decade logarithmic high-voltage stepping supply  

Science.gov (United States)

An improved high-voltage stepping supply, for space instrumentation is described where low power consumption and fast settling time between steps are required. The high-voltage stepping supply, utilizing an average power of 750 milliwatts, delivers a pair of mirror images with 64 level logarithmic outputs. It covers a four decade range of + or - 2500 to + or - 0.29 volts having an output stability of + or - 0.5 percent or + or - 20 millivolts for all line load and temperature variations. The supply provides a typical step setting time of 1 millisecond with 100 microseconds for the lower two decades. The versatile design features of the high-voltage stepping supply provides a quick response staircase generator as described or a fixed voltage with the option to change levels as required over large dynamic ranges without circuit modifications. The concept can be implemented up to + or - 5000 volts. With these design features, the high-voltage stepping supply should find numerous applications where charged particle detection, electro-optical systems, and high voltage scientific instruments are used.

Doong, H.

1978-01-01

111

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

112

Alba high voltage splitter - power distribution to ion pumps  

International Nuclear Information System (INIS)

High Voltage Splitter (HVS) is an equipment designed in Alba that allows a high voltage (HV) distribution (up to +7 kV) from one ion pump controller up to eight ion pumps. Using it, the total number of high voltage power supplies needed in Alba's vacuum installation has decreased significantly. The current drawn by each splitter channel is measured independently inside a range from 10 nA up to 10 mA with 5% accuracy, those measurements are a base for vacuum pressure calculations. A relation, current-pressure depends mostly on the ion pump type, so different tools providing the full calibration flexibility have been implemented. Splitter settings, status and recorded data are accessible over a 10/100 Base-T Ethernet network, nevertheless a local (manual) control was implemented mostly for service purposes. The device supports also additional functions as a HV cable interlock, pressure interlock output cooperating with the facility's Equipment Protection System (EPS), programmable pressure warnings/alarms and automatic calibration process based on an external current source. This paper describes the project, functionality, implementation, installation and operation as a part of the vacuum system at Alba. (authors)

113

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

114

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)

115

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

Science.gov (United States)

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

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

1974-01-01

116

Solid-state high voltage, DC power distribution and control  

CERN Document Server

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

117

High voltage, magnetically switched pulsed power systems  

International Nuclear Information System (INIS)

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

118

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

Science.gov (United States)

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

2010-07-01

119

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

Science.gov (United States)

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

2010-07-01

120

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

Science.gov (United States)

...2010-07-01 false Movement of high-voltage power centers and portable transformers...STANDARDS-UNDERGROUND COAL MINES Underground High-Voltage Distribution § 75.812 Movement of high-voltage power centers and portable...

2010-07-01

121

Complete low power controller for high voltage power systems  

International Nuclear Information System (INIS)

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

122

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

Science.gov (United States)

...75.812 Movement of high-voltage power centers and portable transformers... [Statutory Provisions] Power centers and portable...kept of such examinations. High-voltage cables, other than trailing...

2010-07-01

123

Control and stabilization system for streamer chamber high-voltage supply  

International Nuclear Information System (INIS)

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

124

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

Science.gov (United States)

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

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

2010-01-01

125

An earth-isolated optically coupled wideband high voltage probe powered by ambient light  

Science.gov (United States)

An earth-isolated optically coupled wideband high voltage probe has been developed for pulsed power applications. The probe uses a capacitive voltage divider coupled to a fast LED that converts high voltage into an amplitude-modulated optical signal, which is then conveyed to a receiver via an optical fiber. A solar cell array powered by ambient laboratory lighting charges a capacitor that, when triggered, acts as a short-duration power supply for an on-board amplifier in the probe. The entire system has a noise level <=0.03 kV, a DC-5 MHz bandwidth and a measurement range from -6 to 2 kV; this range can be conveniently adjusted.

Zhai, Xiang; Bellan, Paul

2012-10-01

126

Technological Aspects: High Voltage  

CERN Document Server

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

Faircloth, D C

2013-01-01

127

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

128

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

Science.gov (United States)

...Grounding frames of stationary high-voltage equipment receiving power from...Grounding frames of stationary high-voltage equipment receiving power from... The frames of all stationary high-voltage equipment receiving power...

2010-07-01

129

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

Science.gov (United States)

...Grounding frames of stationary high-voltage equipment receiving power from...Grounding frames of stationary high-voltage equipment receiving power from... The frames of all stationary high-voltage equipment receiving power...

2010-07-01

130

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

131

High Power, High Voltage Electric Power System for Electric Propulsion  

Science.gov (United States)

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

Aintablian, Harry; Kirkham, Harold; Timmerman, Paul

2006-01-01

132

Development of radiation crosslinking process for high voltage power cable  

International Nuclear Information System (INIS)

This work has been done to develop an electron beam crosslinking process for high voltage power cable by solving problems of the foaming and discharge breakdown of thick polyethylene insulation during irradiation. When a polyethylene plaque (d=0.92, MI=1.0) of 4 mm thick corresponding to the wall of 6.6 kV cable was irradiated by 1.5 MeV electrons, the temperature went up to 950C and foaming was observed at a dose of 20 Mrad. On the other hand, irradiation of 24 Mrad was required for sufficient heat resistance (75% gel formation) of polyethylene. Although an addition of conventional polyfunctional monomers reduced the crosslinking dose (10 to 12 Mrad), discharge breakdown occurred at relatively low doses. The present work reveals that both foaming and discharge breakdown are efficiently prevented by the use of dipropargyl succinate (DPS). A 6.6 kV type cable specimen insulated with polyethylene containing 2 phr of DPS was irradiated by 1.5 MeV electrons. While the cable had properties comparable to those of a steam cured one, very few voids were observed in the insulation. (author)

133

Improvement of Routine Test Process of High Voltage Power Capacitors  

OpenAIRE

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

Vennerberg, Patrik

2009-01-01

134

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

135

DYNAMICS OF HIGH-VOLTAGE PLASTIC-INSULATED POWER CABLE HEATING  

OpenAIRE

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

Zolotaryov, V. M.; Yu Antonets, T.

2013-01-01

136

DYNAMICS OF HIGH-VOLTAGE PLASTIC-INSULATED POWER CABLE HEATING  

Directory of Open Access Journals (Sweden)

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

V.M. Zolotaryov

2013-09-01

137

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

International Nuclear Information System (INIS)

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

138

High voltage ignition of high pressure microwave powered UV light sources  

Energy Technology Data Exchange (ETDEWEB)

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

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

1997-12-31

139

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

140

Monitoring of high voltage supply using the Controller Area Network protocol  

International Nuclear Information System (INIS)

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

141

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

Energy Technology Data Exchange (ETDEWEB)

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

N. Greenough, E. Fredd, S. DePasquale

2009-09-21

142

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

Science.gov (United States)

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

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

2014-12-01

143

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

144

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

DEFF Research Database (Denmark)

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

Sztykiel, Michal

2011-01-01

145

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

146

30 CFR 77.800 - High-voltage circuits; circuit breakers.  

Science.gov (United States)

...circuits; circuit breakers. High-voltage circuits supplying power to portable...devices to provide protection against under voltage, grounded phase, short circuit and overcurrent. High-voltage circuits supplying power to...

2010-07-01

147

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

International Nuclear Information System (INIS)

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

148

Hybrid voltage divider used for high voltage pulsed power measurement  

International Nuclear Information System (INIS)

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

149

Nickel-gallium arsenide high-voltage power Schottky diodes  

Science.gov (United States)

A power GaAs Schottky diode (SD) with a chemically deposited Ni barrier was designed, fabricated and tested. The diode has a reverse breakdown voltage VBR of 140 V, forward voltage drop VF (at 50 A/cm 2) of 0.7 V at 23°C, 0.5 V at 150°C and 0.3 V at 250°C, and reverse leakage current densities jR (at -50 V) of 0.1 ?A/cm 2 at 23°C and 1 mA/cm 2 at 150°C. Calculated forward and reverse I- V characteristics using a simple self-consistent computer model are in good agreement with measured values. Calculated characteristics of a silicon SD with identical structure parameters, using the same model, show much poorer VBR, VF and jR values. The theoretical maximum value of VBR is physically limited by the largest allowed VF. For a V Fof ?1.6 V, V BR.maxis ?200 V in Si and ?800 simple technology allows manufacturing of large area GaAs Schottky diodes with average currents up to V in GaAs SDs. Our relatively 100 A.

Ashkinazi, G.; Hadas, Tz.; Meyler, B.; Nathan, M.; Zolotarevski, L.; Zolotarevski, O.

1993-01-01

150

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

151

Analysis and treatment for high voltage bushings of electric auxiliary boiler of nuclear power plant  

International Nuclear Information System (INIS)

The structure and theory of the two high pressure discharged steam electrode boilers installed in Qinshan Nuclear Power Plant II is presented, and the causes for the High Voltage Bushings malfunctions since the boiler put into operation are also analyzed in this paper. The suggestions for the improvement of replacement and maintenance of the Bushings are given. (authors)

152

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

International Nuclear Information System (INIS)

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

153

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

International Nuclear Information System (INIS)

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

154

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2011-08-15

155

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

International Nuclear Information System (INIS)

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

156

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

Science.gov (United States)

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

Birchenough, Arthur; Hervol, David

2008-01-01

157

Test Results from a Simulated High Voltage Lunar Power Transmission Line  

Science.gov (United States)

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

Birchenough, Arthur; Hervol, David

2008-01-01

158

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

International Nuclear Information System (INIS)

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

159

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

Science.gov (United States)

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

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

2012-12-01

160

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

161

Thermionic Fuel Element for High-Voltage Thermionic Nuclear Power Plant  

Science.gov (United States)

Some results of investigation on developing a thermionic fuel element (TFE) having a higher electric strength for a high-voltage thermionic nuclear power plant (NPP) and its insulating elements (a collector assembly and metal-ceramic assemblies) are given.The serviceability of the TFE and its insulation is shown when testing it at thermal rigs and in loop channels for a long time at a voltage higher than 100 V.

Nikolaev, Yuri V.; Vasilchenko, Alexander V.; Eryomin, Stanislav A.; Lapochkin, Nikolai V.

1994-07-01

162

Battery-Operated High-Voltage Power Supply  

Science.gov (United States)

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

Ruitberg, A. P., Kennethm.

1985-01-01

163

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

Science.gov (United States)

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

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

1982-01-01

164

Repetitive plasma opening switch for powerful high-voltage pulse generators  

International Nuclear Information System (INIS)

Results are presented of experimental studies of plasma opening switches that serve to sharpen the pulses of inductive microsecond high-voltage pulse generators. It is demonstrated that repetitive plasma opening switches can be used to create super-powerful generators operating in a quasi-continuous regime. An erosion switching mechanism and the problem of magnetic insulation in repetitive switches are considered. Achieving super-high peak power in plasma switches makes it possible to develop new types of high-power generators of electron beams and X radiation. Possible implementations and the efficiency of these generators are discussed

165

On-site Testing and PD Diagnosis of High Voltage Power Cables:  

OpenAIRE

In addition to after-laying of new-installed high voltage (HV) power cables the use of on-site non-destructive on-site testing and diagnosis of service aged power cables is becoming an important issue to determine the actual condition of the cable systems and to determine the future performances. In this paper based on field experience an overview is presented on on-site testing and partial discharge diagnosis of HV power cables with regard to on-site testing methods: energizing, diagnostic a...

Gulski, E.; Cichecki, P.; Wester, F.; Smit, J. J.; Bodega, R.; Hermans, T. J. W. H.; Seitz, P. P.; Quak, B.; Vries, F.

2008-01-01

166

Power supply development at Centre for Advanced Technology by accelerator power supplies division  

International Nuclear Information System (INIS)

The particle accelerators of the present generation require high performance power converters, which precisely means high precision, high stability, dynamic performance along with high reliability and low cost. The power Supplies Division of Accelerator Programme at Centre for Advanced Technology, Indore is involved in design and development of such power supplies since nearly two decades. Activities of the group related to DC, slow ramped, pulsed and high voltage power supplies are presented here in this paper. (author)

167

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

168

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

Science.gov (United States)

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

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

2014-05-01

169

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

170

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

International Nuclear Information System (INIS)

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

171

Geomagnetically induced currents in the Finnish high-voltage power system: A geophysical review  

Energy Technology Data Exchange (ETDEWEB)

In this work the authors consider geomagnetically induced currents (GICs) in power systems from the viewpoint of a geophysicist. Special attention is paid to the Finnish high-voltage power system, in which exact theoretical model calculations together with recordings have been performed for several years. Several examples are presented of theoretically computed GICs using different geophysical models for estimating the geoelectric field driving GICs. Statistical prediction of GICs is outlined referring to studies made in Finland. It is shown that a combination of GIC recordings at few sites with theoretical modelling of ionospheric currents and the earth's conductivity, and data of geomagnetic activity makes it possible to derive GIC statistics of the entire power system. Finally, the authors discuss requirements for a long-range prediction of GICs, which will obviously be a widely-studied topic in future. 48 refs., 10 figs., 4 tabs.

Viljanen, A.; Pirjola, R. (Finnish Meteorological Institute, Helsinki (Finland))

1994-07-01

172

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

173

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

CERN Document Server

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

Aguglia, D

2014-01-01

174

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

175

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

176

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

Science.gov (United States)

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

Carazo, Alfredo V.; Wintucky, Edwin G.

2004-01-01

177

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

178

Power supply of a betatron injector  

International Nuclear Information System (INIS)

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

179

High Power Amplifier and Power Supply  

Science.gov (United States)

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

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

2008-01-01

180

Modern Risk Assessment for Nuclear Power Plants High-Voltage Substations  

International Nuclear Information System (INIS)

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

181

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

182

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)

183

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

Science.gov (United States)

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

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

2014-10-01

184

Novel high-voltage power lateral MOSFET with adaptive buried electrodes  

Science.gov (United States)

A new high-voltage and low-specific on-resistance (Ron,sp) adaptive buried electrode (ABE) silicon-on-insulator (SOI) power lateral MOSFET and its analytical model of the electric fields are proposed. The MOSFET features are that the electrodes are in the buried oxide (BOX) layer, the negative drain voltage Vd is divided into many partial voltages and the output to the electrodes is in the buried oxide layer and the potentials on the electrodes change linearly from the drain to the source. Because the interface silicon layer potentials are lower than the neighboring electrode potentials, the electronic potential wells are formed above the electrode regions, and the hole potential wells are formed in the spacing of two neighbouring electrode regions. The interface hole concentration is much higher than the electron concentration through designing the buried layer electrode potentials. Based on the interface charge enhanced dielectric layer field theory, the electric field strength in the buried layer is enhanced. The vertical electric field EI and the breakdown voltage (BV) of ABE SOI are 545 V/?m and -587 V in the 50 ?m long drift region and the 1 ?m thick dielectric layer, and a low Ron,sp is obtained. Furthermore, the structure also alleviates the self-heating effect (SHE). The analytical model matches the simulation results.

Zhang, Wen-Tong; Wu, Li-Juan; Qiao, Ming; Luo, Xiao-Rong; Zhang, Bo; Li, Zhao-Ji

2012-07-01

185

Novel high-voltage power lateral MOSFET with adaptive buried electrodes  

International Nuclear Information System (INIS)

A new high-voltage and low-specific on-resistance (Ron,sp) adaptive buried electrode (ABE) silicon-on-insulator (SOI) power lateral MOSFET and its analytical model of the electric fields are proposed. The MOSFET features are that the electrodes are in the buried oxide (BOX) layer, the negative drain voltage Vd is divided into many partial voltages and the output to the electrodes is in the buried oxide layer and the potentials on the electrodes change linearly from the drain to the source. Because the interface silicon layer potentials are lower than the neighboring electrode potentials, the electronic potential wells are formed above the electrode regions, and the hole potential wells are formed in the spacing of two neighbouring electrode regions. The interface hole concentration is much higher than the electron concentration through designing the buried layer electrode potentials. Based on the interface charge enhanced dielectric layer field theory, the electric field strength in the buried layer is enhanced. The vertical electric field EI and the breakdown voltage (BV) of ABE SOI are 545 V/?m and ?587 V in the 50 ?m long drift region and the 1 ?m thick dielectric layer, and a low Ron,sp is obtained. Furthermore, the structure also alleviates the self-heating effect (SHE). The analytical model matches the simulation results. (condensed matter: electronic structure, electrical, magnetic, and optical properties)

186

High Voltage Electrostatic Pendulum  

OpenAIRE

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

187

Overload and High Voltage Tests of Witness Samples of 200m HTS Power Cable  

Science.gov (United States)

1.5/2 kA - 20 kV has been developed and passed acceptance test in December 2009. This cable has superconducting shield and is made of DI-BSSCO™ HT-CA wires from Sumitomo Electric Company. The cable is installed at the experimental test facility to undergo extensive tests first, than it will be reinstalled to Moscow utility grid. As a part of the wide test program the fault current tests and high voltage tests were performed with pieces of the full length cable - so called witness samples. 44 kA fault current test has been performed as well as high voltage test for cable's insulation. In this paper the results of fault current test and high voltage test are presented, discussed and analyzed.

Nosov, A. A.; Fetisov, S. S.; Zubko, V. V.; N. V. Polyakova; Vysotsky, V. S.; Yu. G. Shakaryan; Kiselev, A. N.; Kovalenko, A. Yu.

188

Stabilized power supply for the BKh-3 X-ray tube  

International Nuclear Information System (INIS)

A power supply is described which provides for stabilizing the high voltage and anodic current of the BKh-3 x-ray tube. Its basic parameters are: high voltage = 10 to 25 kV; output power = 2.5 W; integrated instability = 10-3; weight = 1 kg

189

High-voltage linear pulse amplifier  

Science.gov (United States)

This linear amplifier employs moderate-voltage power supplies and components to generate high-voltage pulses of arbitrary shape on a ?s time scale. A linear version of the Marx generator, it is limited to a small duty fraction, but can deliver a large multiple of its supply voltage. Its initial application was generation of specially shaped field-ionization pulses in studies of Rydberg atoms.

Ekstrom, P. A.; Crosby, D. A.; MacAdam, K. B.

1980-12-01

190

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

191

Microcontroller Based Power Supply  

OpenAIRE

These days, majority of electronic devices work on DC power source, so there was a requirement of a reliable and customized power supply. Generally, the requirements are not too varied, but still they require every time a new hardware designing. The idea presented here is to build a microcontroller controlled power supply[1] that is flexible enough to meet different customer requirements, with minor software changes and no corresponding hardware change. Hardware issues are discussed, with a g...

Mundra, Tanvir S.; Sachdeva, Er S. S.; Kahlon, K. S.

2006-01-01

192

New, rugged, high power Cockcroft-Walton power supply  

International Nuclear Information System (INIS)

A ten foot (3 m), ten-stage air-insulated Crockcroft-Walton power supply designed and built at LBL has been tested to 900 kV at the SuperHILAC. Operating at 80 kHz, the power supply features low ripple, moderate stored energy, 10 ma average current, and no bouncer requirement for pulsed loads. Other system features include: inexpensive generating voltmeters and a capacitive pick off for monitoring and regulation in lieu of costly resistance dividers, home-made semiconductor rectifier modules, excellent component protection against sparking, and easy maintenance. This report describes design, construction, and testing of the high voltage system

193

Tuning magnet power supply  

International Nuclear Information System (INIS)

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

194

High-voltage electron accelerators  

International Nuclear Information System (INIS)

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

195

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

International Nuclear Information System (INIS)

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

196

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)

197

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

198

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)

199

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

International Nuclear Information System (INIS)

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

200

Pulse power supply of a linear accelerator for nondestructive testing  

International Nuclear Information System (INIS)

The LUEhU-10-5000D linear electron accelerator pulse power supply system is described. The accelerator is designed for industrial radiography. A function circuit of the accelerator pulse power supply and parameters of the electrical supply of the grid modulation Klystron are presented. Grid modulator circuit operates on the principle of partial discharge of accumulator. Klystron cathode and electron source have joint power supplying from the UP1 high voltage source. The UP1 is connected in the full-wave rectifier circuit

201

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.

202

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

Science.gov (United States)

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

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

2014-12-01

203

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

204

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

205

30 CFR 75.802 - Protection of high-voltage circuits extending underground.  

Science.gov (United States)

...high-voltage equipment supplied power from that circuit...permit ungrounded high-voltage circuits to be extended...length; or, (2) The voltage of such circuits is nominally...phase-to-phase and the cables used in such circuits...metallic shields around each power conductor, and...

2010-07-01

206

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

CERN Document Server

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

Bastos, M C; Hammarquist, M

2011-01-01

207

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

International Nuclear Information System (INIS)

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

208

Proton driver power supply system  

International Nuclear Information System (INIS)

This paper describes magnet power supply system for a proposed Proton Driver at Fermilab. The magnet power supply system consists of resonant dipole/quadrupole power supply system, quadrupole tracking, dipole correction (horizontal and vertical) and sextupole power supply systems. This paper also describes preliminary design of the power distribution system supplying 13.8 kV power to all proton Driver electrical systems

209

Proton driver power supply system  

Energy Technology Data Exchange (ETDEWEB)

This paper describes magnet power supply system for a proposed Proton Driver at Fermilab. The magnet power supply system consists of resonant dipole/quadrupole power supply system, quadrupole tracking, dipole correction (horizontal and vertical) and sextupole power supply systems. This paper also describes preliminary design of the power distribution system supplying 13.8 kV power to all proton Driver electrical systems.

C. Jach and D. Wolff

2002-06-03

210

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)

211

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

212

High Voltage Generation for Physics Lab  

OpenAIRE

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

Baddi, Raju

2012-01-01

213

Switched power workshop power supply working group  

International Nuclear Information System (INIS)

The power supply working group was assigned the problem of pulse charging the 3-MeV gun. The gun is a radial line structure that has two charging configurations: a single ring charged to 500 kV or nine rings charged from 100 to 200 kV. In either configuration, the pulsed source must rapidly charge the structure's ring(s) before breakdown can begin. The issues encountered in charging the structure can be divided into two categories. First, the charging system must be well matched to the gun structure. Proper impedance matching will avoid reflections and limit the fault current if the ring should spark. Second, several systems can achieve the wide range of charge voltages necessary. Some are better suited to high voltages, while others are better at low voltages. The following paragraphs will address the impedance matching issues are review three choices for pulse generators. A system for each type of source is described along with a very rough cost estimate. 1 ref., 4 figs., 2 tabs

214

Switched power workshop: Power supply working group  

International Nuclear Information System (INIS)

The power supply working group was assigned the problem of pulse charging the 3-MeV gun. The gun is a radial line structure that has two charging configurations: a single ring charged to 500 kV or nine rings charged from 100 to 200 kV. In either configuration, the pulsed source must rapidly charge the structure's ring(s) before breakdown can begin. The issues encountered in charging the structure can be divided into two categories. First, the charging system must be well matched to the gun structure. Proper impedance matching will avoid reflections and limit the fault current if the ring should spark. Second, several systems can achieve the wide range of charge voltages necessary. Some are better suited to high voltages, while others are better at low voltages. The following paragraphs will address the impedance matching issues and review three choices for pulse generators. A system for each type of source is described along with a very rough cost estimate. 1 ref., 4 figs., 2 tabs

215

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

216

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

International Nuclear Information System (INIS)

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

217

Design of a System of High Voltage Pulsed Power Converters for CERN’s Linac4 H? Ion Source  

CERN Document Server

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

Aguglia, D

2014-01-01

218

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

219

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

220

Advanced Accessory Power Supply Topologies  

Energy Technology Data Exchange (ETDEWEB)

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

Marlino, L.D.

2010-06-15

221

30 CFR 75.802 - Protection of high-voltage circuits extending underground.  

Science.gov (United States)

...the frames of all high-voltage equipment supplied power...permit ungrounded high-voltage circuits to be extended...length; or, (2) The voltage of such circuits is nominally 2,400 volts or less phase-to-phase and the...

2010-07-01

222

CAMAC power supply  

International Nuclear Information System (INIS)

A standard power supply for the CAMAC system has been designed and built for use in the particle physics experiment at the 1.3 GeV electron synchrotron. This power unit supplies four kinds of d.c. outputs; +6V at 25A, +24V at 3A, -6V at 10A, -24V at 0.3A. A protective circuit for excess current and abnormal voltage is provided on each output line. To increase the flexibility in the connection with the CAMAC crate, three types of output connectors are provided on the rear panel; harmonica terminal, CANNON 9-pin connector and A-MP 42-pin connector. (auth.)

223

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1995-02-01

224

Nested high voltage generator/particle accelerator  

International Nuclear Information System (INIS)

This patent describes a modular high voltage particle accelerator having an emission axis and an emission end, the accelerator. It comprises: a plurality of high voltage generators in nested adjacency to form a nested stack, each the generator comprising a cup-like housing having a base and a tubular sleeve extending from the base, a primary transformer winding encircling the nested stack; a secondary transformer winding between each adjacent pair of housings, magnetically linked to the primary transformer winding through the gaps; a power supply respective to each of the secondary windings converting alternating voltage from its respective secondary winding to d.c. voltage, the housings at the emission end forming a hollow throat for particle acceleration, a vacuum seal at the emission end of the throat which enables the throat to be evacuated; a particle source in the thrond power means to energize the primary transformer winding

225

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

International Nuclear Information System (INIS)

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

226

Power- Supply Network Modeling  

OpenAIRE

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

227

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

228

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

229

Analysis of high voltage operation of gallium arsenide photoconductive switches used in high power applications  

Science.gov (United States)

An opposed-contact photoconductive semiconductor switch, with a n+ region next to the cathode electrode has been simulated. Physical conditions during the pulse charging state, prior to high power switching, are analyzed in order to explain the increased hold-off characteristic of such devices. Results show that the introduction of the n+ region near the cathode inhibits the flow of electrons at the n+/semi-insulating interface until very high fields are reached. The formation of trap-filled regions near the contacts and the resultant inhomogeneous device characteristics that lead to breakdown are thereby shifted to higher voltages. Thus, for switches with a n+ region next to the cathode, the breakdown voltage due to unstable filamentary conduction is also increased beyond those achieved previously, allowing for higher power operation.

Islam, N. E.; Schamiloglu, E.; Fleddermann, C. B.; Schoenberg, J. S. H.; Joshi, R. P.

1999-08-01

230

High-voltage sheaths and charge neutralization in space power systems  

International Nuclear Information System (INIS)

This paper examines the electrodynamics of charged platforms in the ionosphere with a variety of analytical and numerical models. The author's models, while broadly applicable to space power systems, have been specifically designed to study the Tethered Satellite System (TSS-1) due to be launched in early 1992. One of the scientific and engineering 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 authors have identified and explored four important aspects of the interaction between the ambient ionospheric plasma and moving charged orbital platforms: the formation of energetic particles in the wake of a nominally neutral satellite; transient current collection by a highly charged platform; the current closure paths in the ionosphere between multiple polarized platforms; and the conditions for rapid neutralization by enhanced plasma formation in the presence of effluent gases

231

Technique eliminates high voltage arcing at electrode-insulator contact area  

Science.gov (United States)

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

Mealy, G.

1967-01-01

232

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

Directory of Open Access Journals (Sweden)

Full Text Available The loads in rustic area are preeminent pump sets used for various applications i.e. lift irrigation system. Minimal power factor and minimal load factor is found in loads. Further, being a factordissemination of loads, load density is found low. The present distribution system dwell of three-phase 11KV/433Volts distribution transformer with extended L.T Lines. In this system, voltage profile and reliability are poor. In this paper, HVDS is unveiled with smallcapacity distribution transformers. A simple load flow technique is used for solving distribution networks before and after implementation of HVDS. The advantages of implementing HVDS against LVDS system are discussed.

PARWAL Arvind

2013-05-01

233

Dual voltage power supply with 48 volt  

Energy Technology Data Exchange (ETDEWEB)

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

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

2012-11-01

234

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

International Nuclear Information System (INIS)

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

235

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

International Nuclear Information System (INIS)

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

236

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

237

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

International Nuclear Information System (INIS)

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

238

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

239

Radiatively heated high voltage pyroelectric crystal pulser  

International Nuclear Information System (INIS)

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

240

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

International Nuclear Information System (INIS)

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

241

New Simulation Method of New HV Power Supply for Industrial Microwave Generators with N=2 Magnetrons  

OpenAIRE

This original work treats a new simulation method of a new type of high voltage power supply for microwave generators with N magnetrons (treated case: N=2 magnetrons), used as a source of energy in the industrial applications. This new power supply is composed of a single-phase HV transformer with magnetic leakage flow, supplying two parallel cells, which multiplies the voltage and stabilizes the current. The doubler supplies one magnetron. The transformer is presented by its p equivalent cir...

El Ghazal, N.; Belhaiba, A.; Chraygane, M.; Bahani, B.; Ferfra, M.

2013-01-01

242

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

OpenAIRE

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

Golik, O. V.

2013-01-01

243

30 CFR 75.825 - Power centers.  

Science.gov (United States)

...supplying high voltage power to the continuous... (b) Trailing cable disconnecting device...this section, the power center must be...circuit that supplies power to a high-voltage continuous mining...disconnecting switch or a cable coupler....

2010-07-01

244

Power supplies for INDUS-1  

International Nuclear Information System (INIS)

This paper describes the different schemes employed in the power supplies installed for microtron, transport line-1, Booster ring, Transport line-2 and 450 MeV Indus-1 Storage ring presently being commission at CAT, Indore. Approximately 130 Nos. of power supplies with ratings ranging from few VA to about 1.0 MVA are used to energise the electro-magnets for generation of magnetic field. The current stability requirement for the power supplies ranges from 1000 ppm to 100 ppm of current set. The schemes followed for power supplies are off line SMPS, linear series pass and SCR controlled power supplies. In booster the power supplies are of ramp type with repetition rate of 1 Hz and these are designed to take care of coupled voltages due to ramping field. All other power supplies are constant DC type. (author)

245

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

246

Klystron power supply for KOMAC  

International Nuclear Information System (INIS)

A switching mode power supply (SMPS) is a hopeful candidate for the 1 MW CW klystron power supply of KOMAC (KOrea Multi-purpose Accelerator Complex). The merits of the SMPS are low stored energy, small size, high rating efficiency and possible cost saving whereas the demerits are EMI problem and system complexities. The proposed power is 2 MW and it is considered that the modules, each of which has the power of 200 kW, are connected in series to supply the total power. As a first step, a 200 kW SMPS is studied and designed. An overview of the power supply designed so far is presented. (author)

247

Resonance power supplies for large accelerator  

International Nuclear Information System (INIS)

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

248

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

Science.gov (United States)

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

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

2011-01-01

249

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.

250

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

Science.gov (United States)

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

Van Lancker, Marc; Herer, Arnold; Cleland, Marshall R.; Jongen, Yves; Abs, Michel

1999-05-01

251

Technological Aspects: High Voltage  

OpenAIRE

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 deta...

Faircloth, D. C.

2014-01-01

252

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

International Nuclear Information System (INIS)

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

253

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

International Nuclear Information System (INIS)

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

254

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

255

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

256

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

Directory of Open Access Journals (Sweden)

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

O.V. Golik

2013-09-01

257

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

258

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

Science.gov (United States)

This study aimed to investigate association of living near high voltage power lines with occurrence of childhood acute lymphoblastic leukemia (ALL). Through a case-control study 300 children aged 1-18 years with confirmed ALL were selected from all referral teaching centers for cancer. They interviewed for history of living near overhead high voltage power lines during at least past two years and compared with 300 controls which were individually matched for sex and approximate age. Logistic regression, chi square and paired t-tests were used for analysis when appropriate. The case group were living significantly closer to power lines (Plines (Plines against more than 600 meters. This ratio estimated as 9.93 (95%CI: 3.47 to 28.5) for 123 KV, 10.78 (95%CI: 3.75 to 31) for 230 KV and 2.98 (95%CI: 0.93 to 9.54) for 400 KV lines. Odds of ALL decreased 0.61 for every 600 meters from the nearest power line. This study emphasizes that living close to high voltage power lines is a risk for ALL. PMID:20843128

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

2010-01-01

259

OTR magnets power supply system  

International Nuclear Information System (INIS)

OTR magnets comprise both the coils forming the poloidal field and the toroidal field coils. All these coils are superconding and this mainly determines the requirements to the electric power supply system. The most complicated is PF coils supply system, realizing the complex scenaria of plasma discharge formation. TF electric power supply scheme is, to a great extent, determined by the necessity of energy emergency discharge in case of normal phase appearing in a superconductor. (author). 3 figs

260

Autonomous uninterruptable power supply apparatus  

Science.gov (United States)

This invention relates broadly to a power supply apparatus, and in particular to an autonomous uninterruptable power supply apparatus. The purpose of an uninterruptable power supply (UPS) is to protect critical electrical loads from transient or steady stage outages or disturbances in the primary power source. The basic configuration of a typical, commercially available, uninterruptable power supply is comprised at a minimum of a standby battery and a battery charger and may also include an inverter for AC applications. Systems of this type can be found in most computer installations and laboratory systems which cannot tolerate even momentary disturbances of input power. This document describes an autonomous uninterruptable power supply apparatus utilizing a digital processor unit as a control and monitor unit to measure and control input and output parameters in the power supply. A battery charger is utilized to maintain the voltage and current levels with the backup battery supply source which powers an inverter unit that converts the DC power to an AC output.

Masson, J. H.

1984-12-01

261

Prototype tests on the ion source power supplies of the TEXTOR NI-system  

International Nuclear Information System (INIS)

The PINI ion source for the TEXTOR neutral injector is fed by a new modular transistorized power supply. All modules are located in a high voltage cage on 55 kV dc against ground. The normal operation of the injectors includes frequent grid breakdowns causing transient high voltage stresses on the ion source power supplies. These stresses must not disturb the safe operation of the power supplies. A description is given of the set up for extensive testing of a supply prototype module under the expected operating conditions. The main features of this test program are reviewed and the measures taken for a safe operation are discussed. As a result of the investigations, recommendations for the installation of the power supplies at the TEXTOR NI system are given. (author)

262

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

DEFF Research Database (Denmark)

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

Sharma, Ranjan

2012-01-01

263

A PC-PCL-based control system for the high-voltage pulsed-power operation of the Intense Diagnostic Neutral Beam (IDNB) Experiment  

Science.gov (United States)

A stand-alone, semiautomated control system for the high-voltage pulsed-power energy sources on the Intense Diagnostic Neutral Beam Experiment at Los Alamos National Laboratory using personal computer (PC) and programmable logic controller (PLC) technology has been developed and implemented. The control system, consisting of a PC with the graphic operator interface, the network connecting the PC to the PLC, the PLC, the PLC I/O modules, fiber-optic interfaces and software, is described.

Gribble, R.

1993-06-01

264

A PC-PCL-based control system for the high-voltage pulsed-power operation of the Intense Diagnostic Neutral Beam (IDNB) Experiment  

International Nuclear Information System (INIS)

A stand-alone, semiautomated control system for the high-voltage pulsed-power energy sources on the Intense Diagnostic Neutral Beam Experiment at Los Alamos National Laboratory using personal computer (PC) and programmable logic controller (PLC) technology has been developed and implemented. The control system, consisting of a PC with the graphic operator interface, the network connecting the PC to the PLC, the PLC, the PLC I/O modules, fiber-optic interfaces and software, is described

265

High voltage boost DC-Dc converter suitable for variable voltage sources and high power photovoltaic application  

OpenAIRE

Important considerations of a photovoltaic (PV) source are achieving a high voltage and drawing currents with very little ripple component from it. Furthermore, the output from such a source is variable depending on irradiation and temperature. In this research, literature review of prior methods employed to boost the output voltage of a PV source is examined and their limitations identified. This research then proposes a multi-phase tapped-coupled inductor boost DC-DC converter that can achi...

Mwaniki, Fredrick Mukundi

2013-01-01

266

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

267

LED LIGHTS POWER SUPPLY UNIT  

OpenAIRE

The aim of the diploma work was to construct a power supply module for led lights. The operation of the module is presented in detail as well as its construction and assessment measurements. The module is based on the principle of switching power supply, which converts the alternating voltage waveform into DC voltage. The module is designed in a way that the output voltage is lower than the input voltage. The advantages of the switching power supply stems from better efficiency of the cir...

Gres?ak, Aleksander

2013-01-01

268

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

269

A new klystron / gyrotron power supply and modulator system  

International Nuclear Information System (INIS)

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

270

High Voltage and High Reliability Silicon-on-Insulator Power IC Technologies and Their Application to 750 V 4.5 A Micro-Inverter IC  

Science.gov (United States)

We have successfully developed the record high blocking voltage of 750 V and the largest current capability of 4.5 A silicon-on-insulator (SOI) micro-inverter IC, which is made possible by the newly developed high voltage reliability technology and high-speed and low-dissipation extraction enhanced lateral insulated gate bipolar transistor (E2LIGBT). It has been found, for the first time, that the stable and reliable high blocking voltage of 760 V is assured by controlling the sheet-resistance of the polycrystalline silicon (poly-Si) layer of the scroll-shaped resistive field plate (SRFP). The high voltage and high reliability SOI power IC technology is expected as the key technology enabling 750 V 4.5 A micro-inverter IC for harsh applications such as automotive electronics.

Shiraki, Satoshi; Takahashi, Shigeki; Yamada, Akira; Yamamoto, Masahiro; Senda, Koji; Ashida, Youichi; Hiruma, Atsuyuki; Tokura, Norihito

2012-04-01

271

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)

272

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.)

273

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

274

Cables for power supply networks  

Energy Technology Data Exchange (ETDEWEB)

The paper abstracted gives a survey of products and developmental trends in the field of 'cables for power supply networks' which among others were presented on the 1986 Hannover fair (CeBIT and industrial fairs).

Wanser, G.; Reus, H.D.; Heyke, H.J.

1986-12-01

275

Design of the HL-2M power supply control system  

International Nuclear Information System (INIS)

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

276

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

277

Design problems for electric power supplies of thermonuclear device injectors  

International Nuclear Information System (INIS)

Problems of designing electric power supply systems for injectors of large thermonuclear device have been considered. The in ection systems must ensure extraction of beams with the energies 80-120 keV, capacity up to 10-20 MW at injection duration up to several seconds. Electric power supply systems are constructed on the basis of capacitiors or forming lines, commutated to the load with electron or thyristor keys. When designing such power supply systems it is necessary to develop electron valves capable of withstanding the voltage up to 150-200 kV in closed state, to transduce anodic currents up to 100 A and to dissipate power up to 1-2 MW on the anode in the regime of seconds-long pulses. In addition the most important questions elucidated are as follows: 1) development of electric power supply systems with the output voltages up to 600 kV and capacities up to tens of MBT which possess high efficiency, small pulsations at the minimum energy consumption of the filter; 2) development of economical 5-10 keV power supply units for an ion source Under a high potential; 3) designing electric power supply units ensuring minimum sizes of the system, capacity of high-voltage circuits relative to the ground

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

279

Application of thyristor circuit breaker to ohmic heating coil power supply systems  

International Nuclear Information System (INIS)

New ohmic heating coil power supply systems which can generate high voltage are studied to insure their effective and economical use in nuclear fusion devices. Several systems are conceived by using normal, module, and multi-stage repetition types of thyristor circuit breakers. The operation of these systems are analyzed by digital simulation. It is seen that these thyristor circuit breakers are practical and applicable in ohmic heating coil power supply systems. (author)

280

High-voltage engineering  

CERN Document Server

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

Gaxiola, E

2006-01-01

281

Characterisation of the VELO High Voltage System  

OpenAIRE

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

282

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.)

283

A prototype of a high-voltage platform for the KRION ion source  

Science.gov (United States)

A high-voltage platform that has been developed for the KRION ion source is described. The platform design concept is explained. The calculations that have been performed of the influence of the design and materials on the source magnetic field make it possible to define a range of materials suitable for manufacturing the platform. The major components of the high-voltage platform, such as a high-voltage power supplier, and decoupling insulators of the high-voltage power source, and the main and supplementary platforms, are chosen and described. It is determined that, to exclude electric breakdowns and corona discharges, one should use an electrically shielded channel with a cryocooler and power supplies for the KRION-source coupling cables.

Alexandrov, V. S.; Donets, E. E.; Konnov, G. I.; Kosukhin, V. V.; Sidorova, V. O.; Sidorov, A. I.; Shvetsov, V. S.; Trubnikov, G. V.

2014-09-01

284

30 CFR 75.804 - Underground high-voltage cables.  

Science.gov (United States)

...Distribution § 75.804 Underground high-voltage cables. (a) Underground high-voltage cables used in resistance grounded systems shall be equipped with metallic shields around each power conductor with one or more ground...

2010-07-01

285

Magnetically switched power supply system for lasers  

Science.gov (United States)

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

Pacala, Thomas J. (inventor)

1987-01-01

286

Balun technology for bipolar pulsed power supply  

International Nuclear Information System (INIS)

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

287

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

288

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)

289

LHCb calorimeters high voltage system  

Energy Technology Data Exchange (ETDEWEB)

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

Gilitsky, Yu. [IHEP, Protvino 142184 (Russian Federation); Golutvin, A. [ITEP, Moscow (Russian Federation); CERN, CH-1211 Geneva (Switzerland); Konoplyannikov, A. [IHEP, Protvino 142184 (Russian Federation) and CERN, CH-1211 Geneva (Switzerland)]. E-mail: Anatoli.Konoplyannikov@cern.ch; Lefrancois, J. [LAL, Orsay (France); Perret, P. [Laboratoire de Physique Corpusculaire, Clermont-Ferrand (France); Schopper, A. [CERN, CH-1211 Geneva (Switzerland); Soldatov, M. [IHEP, Protvino 142184 (Russian Federation); Yakimchuk, V. [IHEP, Protvino 142184 (Russian Federation)

2007-02-01

290

LHCb calorimeters high voltage system  

International Nuclear Information System (INIS)

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

291

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)

292

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

293

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

Science.gov (United States)

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

2010-07-01

294

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

Science.gov (United States)

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

2010-07-01

295

Specialized device of power supplies  

Directory of Open Access Journals (Sweden)

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

Gunchenko Y. A.

2010-02-01

296

Power supply to congested areas  

Energy Technology Data Exchange (ETDEWEB)

The increasing population density in the congested areas, and the expected greater energy requirement for the individual consumer, will present problems in power supply, and this will involve a direct effect on the directions of development of cable engineering for all voltage levels.

Schmidhuber, P. (Stadtwerke Muenchen (Germany, F.R.). Gruppe Elektrotechnik); Wanser, G. (Hannover Univ. (Germany, F.R.))

1979-05-01

297

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

OpenAIRE

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

298

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

299

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

300

ASDEX upgrade power supply system  

International Nuclear Information System (INIS)

ASDEX Upgrade, the successor to the ASDEX device, is a new tokamak now under construction at Garching. This experiment has a reactor-like divertor with the divertor coils located outside the toroidal field coils. This makes the power and energy requirements high since the total number of ampere-turns of the multipole coils increases approximately as the third power of the distance from these coils to the centre of the plasma. An investigation is made of the power supply system of this type of tokamak for different modes of operation in comparison with the conventional ASDEX divertor experiment. (author)

301

Electro-Optical High-Voltage Sensors  

Science.gov (United States)

Electro-optical sensors for measuring high voltages developed for use in automatically controlled power-distribution systems. Sensors connected to optoelectronic interrogating equipment by optical fibers. Because sensitive material and optical fibers are all dielectric, no problem in electrically isolating interrogating circuitry from high voltage, and no need for voltage dividers. Sensor signals transmitted along fibers immune to electromagnetic noise at radio and lower frequencies.

Gottsche, Allan; Johnston, Alan R.

1992-01-01

302

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

OpenAIRE

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

303

Design and electrical charaterization of a low current-high voltage compact arc plasma torch  

International Nuclear Information System (INIS)

A new compact plasma torch associated with a resonance power supply allows the generation of low power discharges (typically 100 W-1 kW) under high voltage (>1 kV) low current (<1 A) conditions. The resonance power supply allows continuous control of the discharge current, which is a major improvement with respect to the traditional dc power source based on a high voltage transformer. In addition, this system is characterized by a high conversion efficiency that is crucial when it comes to industrial applications. It has been shown that different regimes ranging from streamer over gliding arc to continuous discharges were obtained depending on the operating conditions. The objective of this paper is a better understanding of the different observed behaviour through the determination of the main torch and power supply parameters

304

Abort kicker power supply systems at Fermilab  

International Nuclear Information System (INIS)

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

305

High voltage isolation transformer  

Science.gov (United States)

A high voltage isolation transformer is provided with primary and secondary coils separated by discrete electrostatic shields from the surfaces of insulating spools on which the coils are wound. The electrostatic shields are formed by coatings of a compound with a low electrical conductivity which completely encase the coils and adhere to the surfaces of the insulating spools adjacent to the coils. Coatings of the compound also line axial bores of the spools, thereby forming electrostatic shields separating the spools from legs of a ferromagnetic core extending through the bores. The transformer is able to isolate a high constant potential applied to one of its coils, without the occurrence of sparking or corona, by coupling the coatings, lining the axial bores to the ferromagnetic core and by coupling one terminal of each coil to the respective coating encasing the coil.

Clatterbuck, C. H.; Ruitberg, A. P. (inventors)

1985-01-01

306

High voltage feedthrough bushing  

Science.gov (United States)

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

307

High voltage battery cell scanner development  

Science.gov (United States)

Battery cell voltage scanners have been previously used in low voltage spacecraft applications. In connection with future missions involving an employment of high-power high voltage power subsystems and/or autonomous power subsystem management for unattended operation, it will be necessary to utilize battery cell voltage scanners to provide battery cell voltage information for early detection of impending battery cell degradation/failures. In preparation for such missions, a novel battery cell voltage scanner design has been developed. The novel design makes use of low voltage circuit modules which can be applied to high voltage batteries in a building block fashion. A description is presented of the design concept and test results of the high voltage battery cell scanner, and its operation with an autonomously managed power subsystem is discussed.

Lepisto, J. W.; Decker, D. K.; Graves, J.

1983-01-01

308

-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 readyeakdown. From these studies, JADA is ready for procurement arrangement for the UHV components. (author)

309

Fast quadrupole pulsed power supply in the AGS  

International Nuclear Information System (INIS)

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 ?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

310

Low voltage power supply for HCAL photodetectors in CMS  

CERN Document Server

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

311

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

OpenAIRE

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

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

2011-01-01

312

Circuit design and simulation of a HV-supply controlling the power of 140 GHz 1 MW gyrotrons for ECRH on W7-X  

International Nuclear Information System (INIS)

For plasma heating by ECR in the Stellarator W7-X under construction, 140 GHz gyrotrons with 1 MW cw output power are under development. These tubes have a voltage depressed collector for electron energy recovery. Each gyrotron is fed by two high-voltage sources: a high-power supply for driving the electron beam and a precision low-power supply for beam acceleration. In addition, a protection system with a thyratron crowbar for fast power removal in case of gyrotron arcing is installed. The low-power high-voltage source for beam acceleration is realized by a high-voltage servo-amplifier driving the depression voltage such that the influence of the voltage noise of the main high-power supply on the acceleration voltage is suppressed by feed-back control of the amplifier. Design and simulation of the servo-amplifier by PSpice is presented

313

Precision power supply control module  

International Nuclear Information System (INIS)

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

314

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

International Nuclear Information System (INIS)

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

315

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

316

Power supply design for hadron facility  

International Nuclear Information System (INIS)

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; (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

317

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

318

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

International Nuclear Information System (INIS)

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

319

Meeting the power supply challenge  

International Nuclear Information System (INIS)

A review of activities at Ontario Power Generation since deregulation was presented. Since May 1, 2002, Ontario business and residential users have been able to choose to buy electricity from local utilities at the market price or from fixed-term, fixed-price contracts with retailers. A major heat wave in the summer of 2002 forced electricity prices to rise as supply was strained by record energy demands. On November 11, 2002, Bill 210 placed the retail market on temporary hold as the price of electricity was capped at 4.3 cents per kWh for low-volume consumers. On March 21, 2003, the fixed price was extended to users up to 250,000 kWh. It is expected that energy demand in Ontario will grow 1 per cent each year for the next 10 years. Electricity supply, transmission and distribution in the Greater Toronto area must be addressed to ensure safe, reliable and affordable power. Another issue that must be addressed is that 20 per cent of Ontario's aging generating facilities will have be overhauled or replaced by 2013. Environmental issues and the pending retirement of coal as a fuel source must also be addressed. Possible solutions include returning the Pickering 'A' nuclear facility to service, additional nuclear generation, hydroelectric upgrades, and new green generation initiatives such as wind or gas-fired combined cycle generation. Maintaining the fossil option is possible by reducing emissions. 8 figs

320

Fault Analysis of ITER Coil Power Supply System  

International Nuclear Information System (INIS)

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

321

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

322

Monitoring System for Uninterruptible Power Supply  

OpenAIRE

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

323

A High Power RF Power Supply for High Energy Physics Applications  

CERN Document Server

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

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

2005-01-01

324

The future of electric power supply  

International Nuclear Information System (INIS)

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

325

Uninterruptible power supply (UPS) systems  

Energy Technology Data Exchange (ETDEWEB)

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

NONE

1997-04-01

326

PBX-M shaping field power supplies  

International Nuclear Information System (INIS)

The Princeton beta experiment (PBX) has been upgraded to facilitate further exploration of the confinement advantages offered by the bean shaped plasma cross section. The machine has been subsequently renamed the PBX-M Tokamak. This revision required adding six poloidal field power supplies to the machine, appropriately placing conducting plates to enclose the plasma, and the addition of an improved high recycling divertor configuration. Two field coil power supply systems exist: the ohmic heating (OH) system and the equilibrium field (EF) system. This paper briefly describes the general facility layout, the AC power system, and the power supply machine load and places special emphasis on the six new power supplies

327

Efficient, compact power supply for repetitively pulsed, ''triggerless'' cathodic arcs  

International Nuclear Information System (INIS)

A power supply for ''triggerless,'' repetitively pulsed cathodic arcs has been developed. It is based on a thyristor-switched, high-voltage, high-current, pulse-forming network (PFN). It can provide high pulsed currents (up to 2 kA), with duration of 600 ?s, and pulse repetition rate of up to 10 Hz. Higher repetition rates are possible at lower current. The rectangular pulse shape and amplitude are reproducible to within a few percent. Cathodic arc initiation is extremely reliable because the charging voltage is much higher than the minimum starting voltage for the triggerless arc initiation method. The energy utilization efficiency is very high by intentionally mismatching load and PFN impedances and by using an efficiency-enhancing diode; the stored energy is dissipated primarily in the arc. (c)

328

Development of the 50 kV class high-voltage coaxial connector  

International Nuclear Information System (INIS)

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

329

Temperature controlled high voltage regulator  

Science.gov (United States)

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

330

Bulk water distribution power supply failures  

Scientific Electronic Library Online (English)

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

D T, Nel; J, Haarhoff.

2011-04-01

331

High voltage system for the CMS electromagnetic calorimeter  

International Nuclear Information System (INIS)

The CMS Electromagnetic Calorimeter (ECAL) is made of about 75 000 lead tungstate crystals. The 61 200 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

332

High voltage system for the CMS electromagnetic calorimeter  

Energy Technology Data Exchange (ETDEWEB)

The CMS Electromagnetic Calorimeter (ECAL) is made of about 75 000 lead tungstate crystals. The 61 200 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{sup -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, A.; Barone, L.M.; Cavallari, F.; Dafinei, I.; Re, D. del; Diemoz, M.; Guerra, S.; Longo, E.; Meridiani, P.; Organtini, G.; Palma, A. [Dipartimento di Fisica, Universita ' La Sapienza' and INFN, Sezione di Roma, Rome (Italy); Paramatti, R. [Dipartimento di Fisica, Universita ' La Sapienza' and INFN, Sezione di Roma, Rome (Italy)], E-mail: riccardo.paramatti@roma1.infn.it; Pellegrino, F.; Rahatlou, S.; Rovelli, C.; Santanastasio, F. [Dipartimento di Fisica, Universita ' La Sapienza' and INFN, Sezione di Roma, Rome (Italy)

2007-11-21

333

Simplified design of switching power supplies  

CERN Document Server

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

Lenk, John

1995-01-01

334

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

335

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

Scientific Electronic Library Online (English)

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

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

2013-12-01

336

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

337

Nuclear reactor power supply system  

International Nuclear Information System (INIS)

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

338

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

339

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)

340

An ungrounded power supply using superconductors  

International Nuclear Information System (INIS)

Basic requirements imposed in the power supplies of fiber optical lines used to operate in control systems of highvoltage electrophysical setups are formulated. Systematization on the existing methods of construction of ungrounded power supplies (UPS) is briefly described. A practical scheme of UPS using suoercondensers is given. Its technical characteristics are presented. 9 refs.; 3 figs

341

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

342

Novel piezoelectric transducers for high voltage measurements  

OpenAIRE

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

343

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

344

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

International Nuclear Information System (INIS)

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

345

High voltage protection for the megawatt beam line  

International Nuclear Information System (INIS)

The high voltage supply used to drive a high power neutral injector must have good regulation in order to preserve good ion beam optics. Consequently, peak fault currents can be very high and with 50 Hz supply frequency it is essential to protect the electrodes by fast acting shunt or series systems. Shunt devices may incorporate valves, spark gaps, solid dielectric switches, ignitrons etc., whereas for series elements hard valves or the crossed field interrupter are the only choices available at this time. A summary of the characteristics of several such systems is given together with an indication of costs of the development of auxiliary apparatus required and the further potential of the systems where known

346

Transient phenomena analysis of a DC-1 MV power supply for the ITER NBI  

International Nuclear Information System (INIS)

A power supply for the ITER Neutral Beam Injector (NBI) is a DC ultra-high voltage (UHV) power supply to accelerate negative ion beams of 40 A up to an energy of 1 MeV. Japan Atomic Energy Agency as the Japan Domestic Agency for ITER contributes procurement of dc -1 MV main components such as step-up -1 MV transformers rectifiers, a high voltage deck 2, a -1 MV insulating transformer, a transmission line, a surge reduction system and equipments for site test. Design of the surge suppression in the NBI power supply is one of the key issues to obtain the stable injector performance. This report describes the design study using EMTDC code on the surge suppression by optimizing the core snubber and additional elements in the -1 MV power supply. The results show that the input energy from the stray capacitance to the accelerator at the breakdown can be reduced to about 25 J that is smaller than design criteria for ITER. (author)

347

PC-based control of a high-voltage injector  

International Nuclear Information System (INIS)

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

348

Corrector magnet power supplies for Indus-2  

International Nuclear Information System (INIS)

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

349

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

350

Dielectric barrier discharge driven by high voltage nanosecond pulse generator  

International Nuclear Information System (INIS)

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

351

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)

352

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

International Nuclear Information System (INIS)

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

353

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

International Nuclear Information System (INIS)

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

354

Hybrid power supplies for the SSC Collider  

International Nuclear Information System (INIS)

Ripple studies show that at the drive point of the magnet string, the 720-Hz-current ripple from Silicon-Controlled Rectifier (SCR) power supplies is about 0.1022 mA during the injection period and 0.0648 mA during the holding period. An emittance growth was observed when the ripple was introduced to the collider particle motion simulation code. The emittance growth is especially serious during the injection period. What is an alternative power supply topology that provides high current and low ripple, yet has good reliability and reasonable cost? A hybrid power supply topology is proposed in this paper

355

Power supply for a current ionization chamber  

International Nuclear Information System (INIS)

Power supply of compensation current ionization chamber in the dynamic range of 1 mA-1 pA of the chamber current measured is described. The power supply circuit is made using semiconductor elements and microschemes. Stabilitron is the basic element in the stabilization scheme. Infralow frequency background of output voltage of the power supply is comparable with the voltage background of dry battery. The power supply works out fixed voltage of positive polarity +50O V and smoothly regulated in the range of 0-500 V the voltage of negative polarity for ?-background compensation. The power supply load current is 0-1.5 mA. The voltage stabilization coefficient is >= 5x104. Several supply power blocks of compensation ionization chamber are made according to the scheme described which are used in critical test bed and energy reactors. The block described has been used for supply of chambers of reactivity analogous measurement in the experiments on the determination of reactivity of critical assembly with uranium-graphite fuel core

356

Monitoring System for Uninterruptible Power Supply  

Directory of Open Access Journals (Sweden)

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

S. A.Z. Murad

2007-01-01

357

Nuclear power: energy security and supply assurances  

International Nuclear Information System (INIS)

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

358

Design of ITER NBI power supply system  

Energy Technology Data Exchange (ETDEWEB)

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

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

1997-07-01

359

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)

360

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

International Nuclear Information System (INIS)

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

361

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

International Nuclear Information System (INIS)

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

362

Control units for APS power supplies  

International Nuclear Information System (INIS)

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

363

JT-60 magnet power supply overview  

International Nuclear Information System (INIS)

In a tokamak, the plasma current along the toroidal magnetic field establishes the equilibrium configuration with the assistance of the added poloidal magnetic fields. In the operation of tokamak magnet system, which is divided briefly into the toroidal and poloidal field, a large pulsed electric power is required to magnetize the coils for plasma excitation and confinement. The toroidal field power supply is composed of the utility power network system and the motor generator system. Either both or each of them can supply the toroidal field coils with sufficient electric power depending on various operational requirements. The poloidal field power supply excites the poloidal field coils. Fast and accurate control of coil currents is required to maintain the plasma's shape and current. Therefore thyristor convertors are used to quickly and accurately control the DC output power using the direct digital control (DDC) method which is specially developed for JT-60. (author)

364

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

365

Optimization of resonant power supply circuit  

International Nuclear Information System (INIS)

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

366

Optimization of Resonant Power Supply Circuit  

International Nuclear Information System (INIS)

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

367

BEPC II magnet power supply control system  

International Nuclear Information System (INIS)

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

368

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)

369

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

370

PEP magnet power supply systems  

International Nuclear Information System (INIS)

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

371

High-voltage measurements using digital techniques  

Science.gov (United States)

A transportable data-acquisition system for the determination of transient phenomena during switching operations in high-voltage networks was developed. From voltage dividers with an insulation level appropriate for 420 kV networks, the signals are sent through light guides (amplitude modulated) to analog/digital converters. Current-measuring devices based on Rogowski coils are used with a frequency-modulated optical system, with the possibility to transfer data from high potential to ground level. To avoid disturbances due to high electromagnetic fields, the recording apparatus is placed in a Faraday cage. High-frequency rejection filters and an insulating transformer are inserted in the power line. A PDP 11/34 microcomputer is used for programming, processing and storage of data on disk drives. Results from measurements carried out in the high-voltage laboratory as well as during switching operations of unloaded lines, transformers and motors in the field are given.

Tempelaar, H. G.; Koreman, C. G. A.; Vanloon, A. J.

372

General conditions for electric power supply  

International Nuclear Information System (INIS)

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

373

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

374

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.

Ørndrup Nielsen, Rasmus; Elkiær, Alexander

2013-01-01

375

The fast extraction kicker power supply for the main ring of J-PARC  

Energy Technology Data Exchange (ETDEWEB)

An effect induced by parasitic inductance in a pulsed power supply for a fast extraction kicker was studied. The parasitic inductance in high voltage capacitors for a low impedance pulse forming network disturbs a sharp rise of an excitation current. A high voltage capacitor with a coaxial structure to minimize the parasitic inductance is proposed. The effectiveness was confirmed experimentally. An impedance mismatch by a leakage inductance of a pulse transformer in a transmission line was studied. The effect is serious at the flat-top period of the excitation current. By introducing a compensation circuit, which is composed by a capacitor and a resistor, impedance matching was established. The pulsed power supply for the fast extraction kicker was operated at a charging voltage of 30 kV. A required rise time of less than 1.1 ?s was achieved. The flatness was also confirmed to be in an acceptable value of less than 1%. -- Highlights: ?An effect by parasitic inductance of the energy storage capacitor of the PFN was studied. ?A faster rise time was achieved by introducing a coaxial structure for the PFN capacitor. ?An impedance mismatch by a leakage inductance of a pulse transformer was studied. ?Serious deterioration of the pulsed waveform was cured by a compensation circuit. ?The pulsed power supply for the fast extraction kicker was developed and operated successfully.

Koseki, Kunio, E-mail: kunio.koseki@kek.jp

2013-11-21

376

30 CFR 77.804 - High-voltage trailing cables; minimum design requirements.  

Science.gov (United States)

...Distribution § 77.804 High-voltage trailing cables; minimum design requirements. (a) High-voltage trailing cables used in resistance grounded...metallic shields around each power conductor with one or...

2010-07-01

377

1000-kVA arc power supply  

International Nuclear Information System (INIS)

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

378

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)

379

Basic technology of synchrotron power supply  

Energy Technology Data Exchange (ETDEWEB)

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).

Watanabe, Shin-ichi

1995-01-01

380

Electron cyclotron pulse gyroklstron power supply  

Energy Technology Data Exchange (ETDEWEB)

The system herein described represents utilization of technology developed at Universal Voltronics Corporation in accordance with General Atomic specifications to provide power for a gyrotron developed by Varian Inc. The current designs are derived from experience gained in design of similar systems and the requirements imposed by Varian to supply needs of gyrotron. The technical approach was carefully selected to insure high reliability, high performance, low maintenance time, and best cost trade-off. The gyrotron power supply system is designed to furnish all power, cooling, protection, and mechanical mounting for a pulse gyroklystron. (MOW)

Remsen, D.B. Jr.

1979-10-01

381

Electron cyclotron pulse gyroklstron power supply  

International Nuclear Information System (INIS)

The system herein described represents utilization of technology developed at Universal Voltronics Corporation in accordance with General Atomic specifications to provide power for a gyrotron developed by Varian Inc. The current designs are derived from experience gained in design of similar systems and the requirements imposed by Varian to supply needs of gyrotron. The technical approach was carefully selected to insure high reliability, high performance, low maintenance time, and best cost trade-off. The gyrotron power supply system is designed to furnish all power, cooling, protection, and mechanical mounting for a pulse gyroklystron

382

High-voltage magnetic generator of nonosecond pulses  

International Nuclear Information System (INIS)

A circuit of a high-voltage pulse generator designed to supply electron guns or streamer chamber is described. A ferrite coaxial line, in which shock waves are formed is used in the generator. A thyratron is used as a commutator and a magnetic link in the form of a choke containing 9 turns of wire wound on a permalloy core is used for increasing the generator power. Pulses with a front of 3 ns and an amplitude of 250 kV and pulses with a front of 6 ns and an amplitude of 170 kV are shapid on an active load connected to the generator output. The pulse repetition frequency is up to 70 Hz

383

Power supply system for JAERI AVF cyclotron  

International Nuclear Information System (INIS)

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

384

Efficient chaotic based satellite power supply subsystem  

International Nuclear Information System (INIS)

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

385

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2011-05-30

386

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

International Nuclear Information System (INIS)

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

387

Analysis of three-phase power-supply systems using computer-aided design programs  

International Nuclear Information System (INIS)

A major concern of every designer of large, three-phase power-supply systems is the protection of system components from overvoltage transients. At present, three computer-aided circuit design programs are available in the Magnetic Fusion Energy (MFE) National Computer Center that can be used to analyze three-phase power systems: MINI SCEPTRE, SPICE I, and SPICE II. These programs have been used at Lawrence Livermore Laboratory (LLL) to analyze the operation of a 200-kV dc, 20-A acceleration power supply for the High Voltage Test Stand. Various overvoltage conditions are simulated and the effectiveness of system protective devices is observed. The simulated overvoltage conditions include such things as circuit breaker openings, pulsed loading, and commutation voltage surges in the rectifiers. These examples are used to illustrate the use of the computer-aided, circuit-design programs discussed in this paper

388

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

Science.gov (United States)

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

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

2014-01-01

389

Implementation and design of monitoring and control system in the power supply system for EAST poloidal field  

International Nuclear Information System (INIS)

The monitoring interface is designed using configuration software. By means of this interface, the monitoring node can communicate with the high voltage monitoring node and field bus controllers, so the status of the poloidal field power supply system can be monitored in real time reliably. Meanwhile, the monitoring data will be sent to database node for backup through ODBC. The structure of the power supply monitoring and control system is briefly described. The procedure of real-time data transfer and processing is realized by different communication protocols. (authors)

390

Power supply trip control for nuclear reactor  

International Nuclear Information System (INIS)

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

391

Lawrence Berkeley Laboratory power supply system for neutral beam source development  

International Nuclear Information System (INIS)

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

392

Design of multi-way composite switching power supply for intelligent sensor system  

International Nuclear Information System (INIS)

By the work principle of double grid air counter intelligent sensor system for detecting low energy electron emission, the design specifications of the power supply is put forward. The article goes on with particular design of each part of the multi-way output power supply circuit. The high-voltage-output circuit is a single-end reverse exciting switching power supply, the middle-voltage-output circuit is a push-pull switching power supply under close-loop control and low-voltage-output circuit is realized with integrated power circuit. To design different kinds of switching transformer, varied methods are analyzed in detail. In middle-voltage-output circuit, the following functions can be realized with KA7500B; (1) push-pull output mode, (2) PWM control, (3) soft start, (4) lack-voltage protection, (5) over-current protection. Experiments indicate that the multi-way output power supply, which adopts technology of PWM, satisfies the electrical requirements of sensor system, gets a high efficiency, realizes the miniaturization and has a rather long life duration. (authors)

393

Power supply for thermonuclear devices  

International Nuclear Information System (INIS)

Purpose: To decrease the withstand voltage and the capacity of a capacitor and the power capacity of an AC - DC converter required for the change of current in air-core transformer coils, with respect to the plasma breakdown and plasma current rising. Method: Current changes in air-core transformer coils have been made so far by a capacitor system of discharging electrical energy at once stored in a capacitor or a variable voltage DC conversion system of suddenly interrupting the previous excitation by a variable voltage DC converter. The two systems are combined in this invention, in which a one-way flowing switch is used, to share the current change required for the previous excitation of the air-core transformer coils to the condenser system and share the low voltage and gradual current change required thereafter to the variable voltage DC converter system. (Nakamoto, H.)

394

Synchrotron power supply of TARN II  

International Nuclear Information System (INIS)

The construction and performance of synchrotron power supply of TARN II are described. The 1.1 GeV synchrotron-cooler TARN II has been constructed at Institute for Nuclear Study, University of Tokyo. Constructed power supply for the dipole magnets is 600 V, 2500 A operated in the mode of trapezoid wave form with the repetition cycle of 0.1 Hz. The stability of magnetic field within 10-3 and tracking error of 10-4 have been attained with the aid of computer control system. First trial of synchrotron acceleration of He2+ beam has been done up to 600 MeV in April, 1991. (author)

395

Damping elements in the high-voltage circuits of the ASDEX neutral injectors  

International Nuclear Information System (INIS)

This paper deals with a so-called snubber-transformer, introduced into the power supply cables of a high power ion-source in order to control the well known harmful effects of high-voltage breakdowns. The snubber transformer is a coaxial aircoil transformer, which is loaded with an R, C circuit. It is installed at the source-end of the multipole power cable and is a part of the cable itself. The exact dimensions of the various circuit elements have been determined with a computer program

396

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

Science.gov (United States)

An insulated core transformer (ICT) power supply is an ideal high-voltage generator for irradiation accelerators with energy lower than 3 MeV. However, there is a significant problem that the structure of the segmented cores leads to an increase in the leakage flux and voltage differences between rectifier disks. A high level of consistency in the output of the disks helps to achieve a compact structure by improving the utilization of both the rectifier components and the insulation distances, and consequently increase the output voltage of the power supply. The output voltages of the disks which are far away from the primary coils need to be improved to reduce their inhomogeneity. In this study, by investigating and comparing the existing compensation methods, a new combined compensation method is proposed, which increases the turns on the secondary coils and employs parallel capacitors to improve the consistency of the disks, while covering the entire operating range of the power supply. This method turns out to be both feasible and effective during the development of an ICT power supply. The non-uniformity of the output voltages of the disks is less than 3.5% from no-load to full-load, and the power supply reaches an output specification of 350 kV/60 mA. PMID:24985809

Yang, L; Yang, J; Liu, K F; Qin, B; Chen, D Z

2014-06-01

397

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

Science.gov (United States)

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

Yang, L.; Yang, J.; Liu, K. F.; Qin, B.; Chen, D. Z.

2014-06-01

398

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

International Nuclear Information System (INIS)

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

399

Power supply system for electron gun of 500 keV DC industrial accelerator  

International Nuclear Information System (INIS)

An isolated power supply for a 500 keV/20 mA industrial accelerator has been developed and commissioned at BRIT Vashi, Navi-Mumbai. 500 kV DC supply for this accelerator is based on a 10 stage, balanced Cockcroft-Walton multiplier operating with an input source of 30 kVp-0- 30 kV p at 10 kHz. Electron beam generation at the high voltage terminal is by an indirectly heated LaB6 cathode type electron gun. The electron gun requires 12 V/20 A power for filament, +5 kV/20 mA DC for anode and variable -2 kV/ 5mA DC for the grid bias. A reliable power supply scheme has been adopted in the system, in which power source for the gun supplies has been derived from the AC component present in the multiplier column. This feature eliminates the requirement of a separate power source having 500 kV isolation from ground, like a motor-generator set and the associated problems. Two sets of stepper-motor drive systems controls the accelerator beam parameters. The design details of these supplies and its control scheme are described

400

High voltage electrical amplifier having a short rise time  

Science.gov (United States)

A circuit, comprising an amplifier and a transformer is disclosed that produces a high power pulse having a fast response time, and that responds to a digital control signal applied through a digital-to-analog converter. The present invention is suitable for driving a component such as an electro-optic modulator with a voltage in the kilovolt range. The circuit is stable at high frequencies and during pulse transients, and its impedance matching circuit matches the load impedance with the output impedance. The preferred embodiment comprises an input stage compatible with high-speed semiconductor components for amplifying the voltage of the input control signal, a buffer for isolating the input stage from the output stage; and a plurality of current amplifiers connected to the buffer. Each current amplifier is connected to a field effect transistor (FET), which switches a high voltage power supply to a transformer which then provides an output terminal for driving a load. The transformer comprises a plurality of transmission lines connected to the FETs and the load. The transformer changes the impedance and voltage of the output. The preferred embodiment also comprises a low voltage power supply for biasing the FETs at or near an operational voltage.

Christie, David J. (Pleasanton, CA); Dallum, Gregory E. (Livermore, CA)

1991-01-01

401

Environmental impact of high voltage substations  

International Nuclear Information System (INIS)

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

402

Daresbury SRS booster magnet power supply  

International Nuclear Information System (INIS)

Power supplies for energizing the combined function magnets of a 600 MeV electron synchrotron are described. The magnet current waveform is a fully-biased sinewave with a frequency of 10 Hz and a peak amplitude of 1350 A. The bias is produced by a high stability d.c. source, while the alternating component is generated by a power inverter operating at the 10 Hz fundamental. (author)

403

The transmission-line multiplier high voltage generator  

International Nuclear Information System (INIS)

A new type of radio-frequency high voltage multiplier is described. Its features are potentially very useful for the operation of compact, highly stable, very high voltage electrostatic accelerators. Ac power is propagated along an insulated column which behaves as a band-pass delay line. The rectified outputs of all the stages are then connected in series. Both theory and the results of experimental tests are given. (orig.)

404

Analysis of the HIMAC synchrotron power supply  

International Nuclear Information System (INIS)

The analysis for lattice magnet power supplies of the HIMAC synchrotron is presented. The analysis showed us an advantage of our novel features such as common mode filter, a separation of an upper and lower coil of the load and bypass resistor across the magnet. (author)

405

Power supply with optical-isolator control  

Science.gov (United States)

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

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

1977-01-01

406

Power supply in future: ecological aspects  

International Nuclear Information System (INIS)

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

407

Pulsed power supply for Nova Upgrade  

International Nuclear Information System (INIS)

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

408

France liberalizes its power supply market  

International Nuclear Information System (INIS)

The French market of power supply to companies is now free. This means that Electricite de France (EdF), the first world electric utility now has competitors in its domestic market. This is an important challenge for EdF because 3 millions of clients (70% of the French power consumption) are now concerned by the opening of the power market. According to A. Merlin, head of the energy transportation network (RTE), the opening of the market does not increase the risk of black-out, it just makes the operation of power networks more complex. The implementation of a single power transportation company (RTE) simplifies the mastery of networks safety but the development of investments is necessary to ensure the maintenance of 400 kV power lines. A comparison of the situation of power market liberalization is made for 6 countries (Germany, UK, Spain, US, Netherlands and Italy). Short paper. (J.S.)

409

3.6MW Power Supply System of the 170GHz ECH&CD System in KSTAR  

Directory of Open Access Journals (Sweden)

Full Text Available A 3.6 MW (-66 kV/55 A Gyrotron power supply system was developed for the 170 GHz ECH&CD gyrotron system in KSTAR. This power supply system consists of Cathode Power Supply(CPS, Anode Power Supply(APS and Body Power Supply(BPS. The CPS is using the Pulse Step Modulation by the 32set of IGBT choppers. The respons time of Chopper is very fast. So the cathode voltaget is able to be controlled rapidly. The APS is a sort of voltage devider using zener and switch component. It was achieved 3kHz modulation operation. The BPS is combined the commercial power supply and special high voltage switches. It is very simple topology but 5kHz modulation was accomplished easily. Theses power supply system were installed and commissioned successfully in 2011. This paper presents the topology of the each power supply and test result for 170 GHz gyrotron in KSTAR.

Joung Jin-Hyun

2012-09-01

410

The high voltage homopolar generator  

Science.gov (United States)

System and component design features of proposed high voltage homopolar generator (HVHPG) are described. The system is to have an open circuit voltage of 500 V, a peak output current of 500 kA, 3.25 MJ of stored inertial energy and possess an average magnetic-flux density of 5 T. Stator assembly components are discussed, including the stator, mount structure, hydrostatic bearings, main and motoring brushgears and rotor. Planned operational procedures such as monitoring the rotor to full speed and operation with a superconducting field coil are delineated.

Price, J. H.; Gully, J. H.; Driga, M. D.

1986-11-01

411

High voltage RF feedthrough bushing  

Science.gov (United States)

Described is a multi-element, high voltage radio frequency bushing for trmitting RF energy to an antenna located in a vacuum container. The bushing includes a center conductor of complex geometrical shape, an outer coaxial shield conductor, and a thin-walled hollow truncated cone insulator disposed between central and outer conductors. The shape of the center conductor, which includes a reverse curvature portion formed of a radially inwardly directed shoulder and a convex portion, controls the uniformity of the axial surface gradient on the insulator cone. The outer shield has a first substantially cylindrical portion and a second radially inwardly extending truncated cone portion.

Grotz, Glenn F. (Huntington Station, NY)

1984-01-01

412

Exploring the potential for new power supply  

International Nuclear Information System (INIS)

This presentation examined the possibility of independent power producers (IPPs) developing renewable energy sources such as run-of-river, biomass, small hydro and wind power in the province of British Columbia. The markets for these energy sources were reviewed along with the market restrictions, competition, and energy policies. The IPP potential in BC has been estimated at 7000 MWs, with the highest potential being with wind power. According to Helimax, a Montreal-based wind engineering firm, North Vancouver Island alone has more than 1500 MWs of wind potential. California represents a potential market for this energy source. California has instituted a renewable portfolio standard of over 15 per cent. The trend to buy green is also reflected in the decision by many utilities along the west coast to look for green energy sources to address the high costs and environmental risks associated with natural gas and other fossil fuels. Wind companies are also willing to write long term contracts, well past the limits of natural gas contracts. More utilities are seeking long range stable contracts to hedge rising fuel costs. A winning element of this dynamic is that wind power can stabilize long term electrical prices while gas destabilizes them due to different fuel risks. The long term outlook for renewables is good because they are a tool of choice for addressing global climate change. However, the aging transmission infrastructure poses a restriction to market access. ure poses a restriction to market access. Sea Breeze Pacific Regional Transmission System Inc. has presented some solutions to address this problem. Two power transmission projects are currently under study. These include a 1050 MW transmission capacity project for the Strait of Juan de Fuca; and the Greater West Coast projects which will increase power transfer capacity to and from Vancouver Island via a submarine high voltage DC system that would enable stranded provincial energy resources to be exported to high value markets, bypassing existing congested interfaces with minimal losses. Policy issues affecting the development of renewable energy sources were discussed along with the need for utilities to embrace the integration of independent power producers.figs

413

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

DEFF Research Database (Denmark)

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

Blank, Tobias; Thomas, Stephan

2010-01-01

414

Contribution to high voltage matrix switches reliability  

International Nuclear Information System (INIS)

Nowadays, power electronic equipment requirements are important, concerning performances, quality and reliability. On the other hand, costs have to be reduced in order to satisfy the market rules. To provide cheap, reliability and performances, many standard components with mass production are developed. But the construction of specific products must be considered following these two different points: in one band you can produce specific components, with delay, over-cost problems and eventuality quality and reliability problems, in the other and you can use standard components in a adapted topologies. The CEA of Pierrelatte has adopted this last technique of power electronic conception for the development of these high voltage pulsed power converters. The technique consists in using standard components and to associate them in series and in parallel. The matrix constitutes high voltage macro-switch where electrical parameters are distributed between the synchronized components. This study deals with the reliability of these structures. It brings up the high reliability aspect of MOSFETs matrix associations. Thanks to several homemade test facilities, we obtained lots of data concerning the components we use. The understanding of defects propagation mechanisms in matrix structures has allowed us to put forwards the necessity of robust drive system, adapted clamping voltage protection, and careful geometrical construction. All these reliability considerations in matrix associations have notably allowed the construction of a new matrix structure regrouping all solutions insuring reliability. Reliable and robust, this product has already reaches the industrial stage. (author)

415

Development of large high-voltage pressure insulators for the Princeton TFTR [Tokamak Fusion Test Reactor] flexible transmission lines  

International Nuclear Information System (INIS)

Specially formulated insulator materials with improved strength and high-voltage properties were developed and used for critical components of the flexible transmission lines to the TFTR neutral beam ion sources. These critical components are plates which support central conductors as they exit the high-voltage power supply and enter the ion source enclosure. Each plate acts both as a high-voltage insulator and as a pressure barrier to the SF6 insulating gas. The original plate was made of commercial glass-epoxy laminate which limited the plate voltage capacity. The newly developed insulator is made of specially-formulated cycloalphatic Di-epoxide whose isotropic properties exhibit increased arc resistance. It is cast in one piece with skirts which greatly increase the breakdown voltage. This paper discusses the design, fabrication and testing of the new insulator

416

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

International Nuclear Information System (INIS)

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

417

Magnet power supply as a network object  

International Nuclear Information System (INIS)

Magnet power supplies with embedded microprocessor controls are being installed in the beam-lines of the linear accelerator and proton storage ring at LAMPF. Using an RS422 link they communicate with the accelerator control system through a terminal server connected to the site-wide DECnet backbone. Each supply is, for all intents and purposes, a network object. The controller has a command set of over seventy-five three-character ASCII control and read-back instructions. Strategies for choosing the appropriate control protocol and the process of integrating these devices into a large accelerator control system will be presented. 7 refs., 2 figs., 1 tab

418

High-Voltage Droplet Dispenser  

Science.gov (United States)

An apparatus that is extremely effective in dispensing a wide range of droplets has been developed. This droplet dispenser is unique in that it utilizes a droplet bias voltage, as well as an ionization pulse, to release a droplet. Apparatuses that deploy individual droplets have been used in many applications, including, notably, study of combustion of liquid fuels. Experiments on isolated droplets are useful in that they enable the study of droplet phenomena under well-controlled and simplified conditions. In this apparatus, a syringe dispenses a known value of liquid, which emerges from, and hangs onto, the outer end of a flat-tipped, stainless steel needle. Somewhat below the needle tip and droplet is a ring electrode. A bias high voltage, followed by a high-voltage pulse, is applied so as to attract the droplet sufficiently to pull it off the needle. The voltages are such that the droplet and needle are negatively charged and the ring electrode is positively charged.

Eichenberg, Dennis J.

2003-01-01

419

Design of neutral beam injection power supplies for ITER  

International Nuclear Information System (INIS)

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

420

Design of neutral beam injection power supplies for ITER  

Energy Technology Data Exchange (ETDEWEB)

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

Watanabe, Kazuhiro; Okumura, Yoshikazu [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment; Higa, Osamu; Kawashima, Syuichi [Toshiba Corp., Kawasaki, Kanagawa (Japan); Ono, Youichi; Tanaka, Masanobu [Hitachi Ltd., Tokyo (Japan)

2000-03-01

421

NSTX power supply real time controller  

International Nuclear Information System (INIS)

The NSTX is a new national facility for the study of plasma confinement, heating, and current drive in a low aspect ratio, spherical torus (ST) configuration. The ST configuration is an alternate magnetic confinement concept which is characterized by high beta (ratio plasma pressure to magnetic field pressure) and low toroidal field compared to conventional tokamaks, and could provide a pathway to the realization of a practical fusion power source. The NSTX depends on a real time, high speed, synchronous, and deterministic control system acting on a system of thyristor rectifier power supplies to (1) establish the initial magnetic field configuration; (2) initiate plasma within the vacuum vessel; (3) inductively drive plasma current; and (4) control plasma position and shape. For the initial ''day 0'' 1st plasma operations (Feb. 1999), the system was limited to closed loop proportional-integral current control of the power supplies based on preprogrammed reference waveforms. For the ''day 1'' phase of operations beginning Sept. 1999 the loop has been closed on plasma current and position. This paper focuses on the Power Supply Real Time Controller (PSRTC)

422

Power supply of ETL-TPE 2  

International Nuclear Information System (INIS)

The ETL-TPE2 experiment is planned to investigate a behavior of high beta plasma with high temperature. A system design of power supply to generate and to confine the plasma is described. Essential features of the design are the following; 1) To obtain a dense plasma with high temperature, two capacitor banks with opposite polarities of 80 kV charging voltage are provided in tandem feed for the toroidal fast field. 2) A high current pulse with long duration is supplied by a power crowbar system and realizes the investigation of the plasma confinement for a longer pulsed magnetic field. A power supply system of the power crowbar is connected with a main circuit in series through a current transformer. The circuit system is operated at high efficiency and high reliability. 3) In the vertical and compensating field circuits, each rise time and peak value of currents can be controlled over a wide range of pre-set programmings corresponding to an experimental condition. 4) A small resistance is connected with a crowbar circuit in a compression pre-heat field circuit. The circuit can be crowbarred at an arbitrary phase. This operation and the effect of additional resistance are favourable to maintain an effective plasma heating and to improve the plasma confinement. (author)

423

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

DEFF Research Database (Denmark)

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

Thummala, Prasanth; Huang, Lina

2012-01-01

424

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

International Nuclear Information System (INIS)

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

425

Exporting Australia's remote area power supply industry  

International Nuclear Information System (INIS)

The Australian renewable energy industry has two faces: Remote Area Power Supply systems (RAPS), where the trade-off is between the traditional diesel generator and diesel hybrid or the stand alone renewable energy system. The competency of the Australian RAPS industry is recognised internationally. Grid connected renewable energy technologies, where industry activity is expanding rapidly, but where Australian competencies carry relatively little weight internationally (other than for research and development of related components such as big performance, crystalline silicon photovoltaic cells). Individual industry development strategies are required in each instance. The focus of this paper is on strategies that enhance the export potential of the Australian RAPS industry. Involvement of the electricity supply utilities is promoted as a means of quickly instituting a substantial industry presence. The term RAPS can be confusing. It is used to describe any supply system serving a remote user, be they a single property owner with a simple, stand alone DC photovoltaic supply, or several communities with complex, inter-connected, diesel/hybrid power stations, sometimes termed a 'remote-grid'. Utility interest tends to emerge as market fragmentation decreases, system complexity increases and economies of scale become evident. A review of the domestic situation is a necessary adjunct to development of export strategies for Australian RAPS products. The two are inexorably lan RAPS products. The two are inexorably linked, as is reflected in the format of this paper. (author)

426

Performance of a 2-megawatt high voltage test load  

International Nuclear Information System (INIS)

A high-power, water-cooled resistive load which simulates the electrical load characteristics of a high-power klystron, capable of 2 megawatts dissipation at 95 kV DC, was built and installed at the Advanced Photon Source for use in load-testing high voltage power supplies. During this testing, the test load has logged approximately 35 hours of operation at power levels in excess of one mezawatt. Slight variations in the resistance of the load during operation indicate that leakage currents in the cooling water may be a significant factor affecting the performance of the load. Sufficient performance data have been collected to indicate that leakage current through the deionized (DI) water coolant shunts roughly 15 percent of the full-load current around the load resistor elements. The leakage current could cause deterioration of internal components of the load. The load pressure vessel was disassembled and inspected internally for any signs of significant wear and distress. Results of this inspection and possible modifications for improved performance will be discussed

427

High voltage load resistor array  

Science.gov (United States)

A high voltage resistor comprising an array of a plurality of parallel electrically connected resistor elements each containing a resistive solution, attached at each end thereof to an end plate, and about the circumference of each of the end plates, a corona reduction ring. Each of the resistor elements comprises an insulating tube having an electrode inserted into each end thereof and held in position by one or more hose clamps about the outer periphery of the insulating tube. According to a preferred embodiment, the electrode is fabricated from stainless steel and has a mushroom shape at one end, that inserted into the tube, and a flat end for engagement with the end plates that provides connection of the resistor array and with a load.

Lehmann, Monty Ray (Smithfield, VA)

2005-01-18

428

DIII-D power supply fault system  

International Nuclear Information System (INIS)

The DIII-D tokamak magnetic confinement fusion device at General Atomics has been equipped with a power supply fault system which provides orderly shutdown in case of any of a number of faults. The nature of the fault dictates the extent of the shutdown required. CAMAC hardware accumulates data and triggers computer acquisition of diagnostic information. The system speeds diagnosis and repair of problems

429

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

Energy Technology Data Exchange (ETDEWEB)

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

Koseki, Kunio, E-mail: kunio.koseki@kek.jp

2014-01-21

430

NSLS-II booster power supplies control  

International Nuclear Information System (INIS)

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

431

SPEAR3 LARGE DC MAGNET POWER SUPPLIES  

International Nuclear Information System (INIS)

The Stanford Synchrotron Radiation Laboratory (SSRL) has successfully commissioned SPEAR3, its newly upgraded 3-GeV synchrotron light source. First stored beam occurred December 15, 2003 and 100mA operation was reached on January 20, 2004. This paper describes the specification, design, and performance of the SPEAR3 DC magnet large power supplies (LGPS) that consist of tightly-regulated (better than ±10 ppm) current sources ranging from 100A to 225A and output powers ranging from 70kW to 135kW. A total of 6 LGPS are in successful operation and are used to power strings of quadrupoles and sextupoles. The LGPS are isolated by a delta/delta-wye 60Hz step-down transformer that provides power to 2 series-connected chopper stages operating phase-shifted at a switching frequency of 18-kHz to provide for fast output response and high efficiency. Also described are outside procurement aspects, installation, in-house testing, and operation of the power supplies

432

Development of connectors for high voltage motors  

International Nuclear Information System (INIS)

In the past the terminal cable connections of high-voltage motors of the 6.6 kV rate were made using self-bonding tape, by bolting the lead cable terminals in the motor terminal boxes. The terminal connection made by taping were not advantageous, because taping for termination and decoupling cables for motor inspection and maintenance were time-consuming. Furthermore, when curvature-forming of cables, processability of termination, and required performances were taken into consideration, the problems became more significant with increasing in size of termination boxes. In recent years it has been required that the time required for inspection and maintenance equipment in an environment exposed to the radiation like nuclear power plants be reduced to a minimum, and as a result the demand for cable connectors which would help to fulfil such purposes has been i