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1

High voltage DC power supply  

Energy Technology Data Exchange (ETDEWEB)

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

Droege, Thomas F. (Batavia, IL)

1989-01-01

2

High-voltage power supplies for injectors  

International Nuclear Information System (INIS)

A scheme of high-voltage power supply for an IREK injector of fast atoms intended for plasma heating of a thermonuclear reactor is given. Application of cascadeconnected rectifier tubes, one of which is controlled from the low (10 kV) voltage side as well as separation of functions of electron tubes under control and shaping of voltage fronts on the electrodes are peculiar features of the scheme. A scheme of thyristor pulse shaper for power supply of the accelerating gap at nominal voltage of 10 kV and current up to 100 A is given. Test results of the pulse shaper made on the base of two power cases of rectifier are presented. The amplitude of emergency current does not exceed 1.5 kA at a 150 ms switch-off time. Utilization of devices containing a controlled rectifier with a LC-filter supplied from 6-10 kV network and a converter of d.c. voltage containing a three-phase voltage inverter, step-up transformer and high-voltage noncontrolled rectifier is shown to be promising for 200 kV supply of accelerating gaps.

1982-01-01

3

Modular high voltage power supply for chemical analysis  

Energy Technology Data Exchange (ETDEWEB)

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

4

Modular high voltage power supply for chemical analysis  

Energy Technology Data Exchange (ETDEWEB)

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)

2007-01-09

5

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

6

Fully Digital FM Controller for High Voltage Power Supply  

International Nuclear Information System (INIS)

A fully digital FM Controller for high voltage power supply is introduced based on DSP, AD9850, AD976 chip, etc. The power supply works under the ARM mode of the parallel resonant circuit. Through the dosed-loop control by PID algorithm, IGBTdriver circuit can adjust itself by step 1Hz, so the stability of the high voltage power supply's output voltage can be guaranteed. (authors)

2009-01-01

7

High voltage cables in urban power supply systems  

Energy Technology Data Exchange (ETDEWEB)

The author presents recent developments in high voltage cable techniques. From the user's viewpoint, he goes into detail as far as problems are concerned that arise with the use of high voltage cables in urban supply grids. The planning of a high voltage cable grid and the selection of a certain type of cable is not only influenced by the characteristics of different types of cables, but also and to a high degree by the potential laying technique, the power to be transmitted, by costs, the treatment of the neutral of the high voltage gird, idle-current requirements, interference through coupling, by the thermal effect of the environment, the potential protection of the cable grid against mechanical and chemical effects, the failure rate, control, and by fault location. Finally, the author shows future developments which are possible in high voltage and ultra high voltage cable techniques.

Schmidhuber, P.M.

1981-03-01

8

High-voltage pulse generator for electron gun power supply  

International Nuclear Information System (INIS)

High-voltage pulse generator with combined capacitive and inductive energy storages for electron gun power supply is described. Hydrogen thyratron set in a short magnetic lense is a current breaker. Times of current interruption in thyratrons are in the range from 100 to 300 ns. With 1 kV charging voltage of capacitive energy storage 25 kV voltage pulse is obtained in the load. The given high-voltage pulse generator was used for supply of an electron gun generating 10-30 keV low-energy electron beam.

1987-01-01

9

Development of an Economic High Voltage Power Supply  

International Nuclear Information System (INIS)

Full text: A 2000 V, 1 mA economical high voltage power supply for NaI(Tl) detector was developed. The purpose of this study was to design an electrical circuit upon local component availability for cost effective and ease maintenance. Besides, this circuit was designed to support computer interfacing for data manipulation and controls. The designed circuit showed capability of 2000 V, 1 mA high voltage power supply with ripple voltage less than 30 mVp-p and higher than 60 percent efficiency at maximum load. The linearity of high voltage adjustment in manual and automatic mode was found to be excellent with R2 = 0.9982 and 0.9997 respectively

2007-01-01

10

E-beam high voltage switching power supply  

Energy Technology Data Exchange (ETDEWEB)

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

11

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; Meng Wang; Fucai Liu

2013-01-01

12

Test wire for high voltage power supply crowbar system  

International Nuclear Information System (INIS)

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

1997-07-02

13

Test wire for high voltage power supply crowbar system  

Energy Technology Data Exchange (ETDEWEB)

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.

Bradley, J.T. III; Collins, M.

1997-09-01

14

A new automatic high voltage power supply without sudden changes  

International Nuclear Information System (INIS)

The paper introduces a new DC high voltage power supply, of which the rise and fall of its output are automatic, smooth and slow without sudden changes. Especially at sudden interruption of power service, its output may decrease to zero automatically and slowly. When it is used in a semiconductor detector (HpGe, GeLi, SiLi) measuring radioactive rays, it can avoid the damage to this kind of expensive detectors and its accessory, which is effected by the rapid changes or sudden fall of high voltage caused by careless operation or sudden interruption of power service. Therefore, it may maintain the inherent performances and prolong the life of these detectors.

1995-01-01

15

A battery powered high voltage bias supply for Ge detectors  

International Nuclear Information System (INIS)

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

1978-01-01

16

High-Voltage Power Supply System for Laser Isotope Separation  

International Nuclear Information System (INIS)

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

1979-01-01

17

E-beam high voltage switching power supply  

Energy Technology Data Exchange (ETDEWEB)

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

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

1997-01-01

18

E-beam high voltage switching power supply  

International Nuclear Information System (INIS)

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

1995-05-22

19

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

International Nuclear Information System (INIS)

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

2009-01-01

20

High-voltage power supply system for an electrostatic deflector  

International Nuclear Information System (INIS)

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

1979-01-01

 
 
 
 
21

High Voltage Decoupled High-Current Power Supply  

International Nuclear Information System (INIS)

A 10 kW power supply (PS) with smooth adjustment of the load current from zero up to 2 kA is described. The operating mode with a load current stability up to 0.1% and long-term instability of 0.01% is possible. The PS includes the controlled rectifier with the power factor correction, the high-frequency invertor, 35 kV decoupled transformer-rectifier module and the control block

2006-01-01

22

Development of Floating Power Supply for Measurement System of High Voltage Power Line  

Science.gov (United States)

A measurement system of the high voltage power line without using an expensive insulation has been developed. The equipment is directly attached to the power line and floated in the air to insulate from the ground. In this paper, a ±5 V dual outputs power supply for the floating measurement system is presented. The power supply obtains energy from the current in the high voltage power line using an induction coil. The AC voltage induced by the coil is greatly changed from several volts to several hundred volts by the current in the high voltage power line and by the load of the power. Then, the AC voltage is roughly converted around 5 V by an AC-DC converter in order to absorb this large fluctuation of the AC input voltage. After that, the regulated ±5 V is supplied by a dual output DC-DC converter. By using the proposed power supply, it is confirmed that, the floating measurement system can monitor the signal of the power line current ranging from 50 to 300 A. The excellent characteristics are obtained by the steady-state and transient experiments of the proposed power supply.

Ichiro, Oota; Eiji, Nishiyama; Toyonori, Matsuda; Mitsunori, Kawano; Kenshi, Kuwanami

23

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

International Nuclear Information System (INIS)

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

2008-01-01

24

Development of high voltage DC power supplies for particle beam applications at CAT Indore  

International Nuclear Information System (INIS)

At Center for Advanced Technology (CAT), Indore, we have an ongoing program for development of dc electron accelerators with an objective to demonstrate their range of applications and gradual induction into indigenous industries. The high voltage activities here are mainly intended to support the development of dc electron accelerators covering wide energy range. Various power supplies ranging from 15 kV to 750 kV have been developed to suit the requirements of different machines. The paper presented here describes the design and developmental aspects of these power supplies with focus on challenges faced to meet the specific requirements of the power supplies and their solutions. The schemes adopted for generation of floating power supplies for electron gun and their controls are briefly described. Since the power supplies are expected to encounter adverse conditions during their operation, a reliable protection system is essential for their safe and trouble-free operation. The protection aspects of these power supplies are also covered in this paper. Reliability and safe operation of a high voltage power supply primarily depends on integrity of its insulation system. High voltage tests are used to examine this integrity and to determine the ability of the insulation to meet its design specifications. At the end, the paper illustrates the high voltage test and measurement facilities available at CAT. (author)

2005-01-01

25

High-voltage power supply system for high-power electron guns  

International Nuclear Information System (INIS)

[en] In the high-voltage power supply system of the electron beam evaporator steep current rises and drops in the case of short circuits are avoided. For this purpose a pulse protection filter is installed in the circuit leading to the cathode. It consists of a capacitor connected parallel to the junction cathode/anode, a choke, a free-running diode blocked in the direction to the cathode, and a discharge resistor. (DG)

1980-01-01

26

High-voltage power supply system for high-power electron guns  

Energy Technology Data Exchange (ETDEWEB)

In the high-voltage power supply system of the electron beam evaporator steep current rises and drops in the case of short circuits are avoided. For this purpose a pulse protection filter is installed in the circuit leading to the cathode. It consists of a capacitor connected parallel to the junction cathode/anode, a choke, a free-running diode blocked in the direction to the cathode, and a discharge resistor.

Redel, K.G.; Deppisch, G.

1980-11-20

27

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

International Nuclear Information System (INIS)

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

2007-01-01

28

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

CERN Multimedia

The authors describe a remotely controlled power supply multichannel system delivering a current of 200 mu A per channel up to 5.5 kV, and allowing voltage setting as well as current monitoring. The system is presently used in the charmed meson photoproduction experiment (NA1) at SPS, CERN. The novel characteristics of the system are: 16 independent channels, under remote control of a standard CAMAC- minicomputer interface, and a console that allows the manual control and read-out of a maximum of 16 systems. This system can usefully replace the conventional power supplies, eliminating high voltage distribution encumbrance and often several kilometers of high voltage cables. (4 refs).

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

1980-01-01

29

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; K. Chih-Ming

2013-01-01

30

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

International Nuclear Information System (INIS)

[en] 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

1997-01-01

31

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

Science.gov (United States)

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

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

2013-03-01

32

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.)

1995-01-01

33

A new VME based high voltage power supply for large experiments  

International Nuclear Information System (INIS)

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

1991-01-01

34

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.

1997-01-01

35

High-power high-voltage pulse generator for supplying electrostatic precipitators of dust  

International Nuclear Information System (INIS)

[en] The study and development of an experimental high voltage generator specialized in the supply of electrostatic precipitators are presented. The main parameters of the pulse generator are: U = -30 kV, I = 8.8 A, ? = 120?s, fr = 150 Hz. The pulse generator was tested on a laboratory electrostatic precipitator with nominal capacitance C = 25 nF, biased at -40 kV by means of a separate high voltage rectifier. The experimental results will be used for the creation of a more powerful pulse generator, a prototype for the supply of a real industrial electrostatic precipitator: U = -50 kV, I = 313 A, ? = 100?s, fr = 300 Hz, C = 100 nF. (Author)

1992-01-01

36

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

International Nuclear Information System (INIS)

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

2011-01-01

37

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

International Nuclear Information System (INIS)

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

2008-01-01

38

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

International Nuclear Information System (INIS)

[en] 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.)

1995-01-01

39

Development of a universal serial bus-powered mini-high-voltage power supply for microchip electrophoresis.  

UK PubMed Central (United Kingdom)

We describe a miniature high-voltage power supply (HVPS) with dimensions of 4.7 x 5.6 x 2.5 cm (W x L x H) powered by universal serial bus (USB) ports. Two strategies were adopted to ensure its efficient power usage. (i) Only two high-voltage converters (one positive and one negative) and two relays were used for power saving, while keeping the sample plug stable and well-defined and avoiding sample leakage for microchip electrophoresis. (ii) The components and their running modes were specially designed to decrease power waste according to the feature of different periods of the microchip electrophoresis process. Performance of this USB-based mini-HVPS was demonstrated using sodium fluorescein analyte with microchip electrophoresis/LIF detection.

Jiang L; Jiang X; Lu Y; Dai Z; Xie M; Qin J; Lin B

2007-04-01

40

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

Directory of Open Access Journals (Sweden)

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

Zhenbao Zhu; Rui Tian

2009-01-01

 
 
 
 
41

The development of long pulse high voltage power supply for MNI-1U neutral beam injector  

International Nuclear Information System (INIS)

A high power long pulse high voltage power supply (HVPS) for MNI-1U neutral beam injector (NBI) is described. This HVPS is used as a switching regulator with a duty cycle of 1/100, the specifications of circuit are as follows, output pulse voltage 50kv, pulse current 30A, pulse width 50ms, rise-time and fall-time of the voltage are less than 25 ?s, stability of the pulse flat is better than 0.5%, regulation response time of the pulse voltage less than 30 ?s can be attained. It is also used as a stable DC HVPS, output voltage is 1 to 100kv, current is 1 to 5A. If regulation tube is shunted with high power resistor in parallel, the current can be extended to 10A, stability of the output voltage or current is better than 0.1%. Now, the HVPS has been put into operation for MNI-1U NBI and PIG ion source made in French. 3 refs., 5 figs

1989-01-01

42

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

43

Cell therapy unit, has high voltage power supply connected to coil and storage capacitor through variable capacity resistor capacity network  

UK PubMed Central (United Kingdom)

A cell therapy unit has a mains driven high voltage power supply (SNT) and coil (COIL) connected storage capacitor (CAP) charged through an electronic diode or thyristor switch (SWITCH) and rectifier (RECT) and parallel or series variable capacity resistor capacitor network (RC1, RCII).

44

Progress for development of multi-PMTs high voltage power supply control system for large array detector  

International Nuclear Information System (INIS)

It is described in this paper that the detailed structure and characteristics of the Multi-PMTs high voltage power supply control system. These PMTs are installed at some array detectors in IMP, such as RIBLL LASCAR scintillator detector array, RIBLL2 neutron wall and TOF wall etc. (authors)

2004-01-01

45

High voltage cable in municipal electricity supply  

Energy Technology Data Exchange (ETDEWEB)

The author explains current developments in high voltage cable technology and subsequently describes problems inherent in its application, from the users viewpoint, in municipal electricity supply. The planning of a high voltage cable network and the selection of a specific type of cable are not only dependent on the typical properties of various cables but to a major degree also on the feasible laying technique, the power transmitted, the costs, the stellation treatment of the high voltage network, the acceptance requirement, the inductive influence from telecommunication cable, thermal influences from the environment, eventual safeguards from mechanical and chemical damage to the network, frequency of failure and surveillance and breakdown location. In conclusion, the author portrays potential developments in the fields of high and maximum voltage cable from the perspectives of today.

Schmidhuber, P.M.

1980-12-22

46

Design of a single phase high voltage DC power supply at 15 kV output using voltage doubler circuit  

Energy Technology Data Exchange (ETDEWEB)

High voltage testing equipment is normally used in research laboratories and routine testing laboratories. However, the work carried out in research laboratories varies significantly from one establishment to the other. In addition, the type of equipment needed varies accordingly. A general high voltage laboratory may include equipment for all classes of routine tests, with testing equipment such as transformer, switchgear, bushings as well as cables. In the industry, the main application of the direct current (DC) high voltage is for testing cables with a relatively large capacitance, which takes a very large current if it is tested with alternating current (AC) voltages. This paper presented the results of a study that examined the voltage doubler circuit based on simulation, hardware implementation, and on Cockcroft-Walton (C-W) voltage multiplier circuits to fabricate a DC power supply in the laboratory at the output range of 15 kV. The paper provided a detailed description of the simulation, design, development and implementation of the hardware needed in order to build a high voltage DC power supply in the laboratory. The simulation and experimental results were also presented using EMTDC PSCAD software. 7 refs., 1 tab., 10 figs.

Mariun, N.; Anayet, K.; Khan, N.; Amran, M. [Putra Malaysia Univ., Serdang (Malaysia). Dept. of Electrical and Electronic Engineering

2006-07-01

47

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

International Nuclear Information System (INIS)

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

1987-01-01

48

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

Directory of Open Access Journals (Sweden)

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

He Zhi-Min; Yue Tian-Chen; Liu Ya-Dong; Sheng Ge-Hao; Jiang Xiu-Chen; Zhang Ying-Bin; Li Shu-Qin; Wang Qiang

2013-01-01

49

A high-current, high-voltage power supply with special output current waveform 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.

1992-01-01

50

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

International Nuclear Information System (INIS)

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

2003-01-01

51

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)

1999-01-01

52

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)

2001-01-01

53

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

Directory of Open Access Journals (Sweden)

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

Belhaiba Abderrahim; N. Elghazal; M. Chraygane; M. Ferfra; B. Bahani; M.Ould Ahmedou

2012-01-01

54

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

2013-01-01

55

An On-Chip Noise Canceller with High Voltage Supply Lines for Nanosecond-Range Power Supply Noise  

Science.gov (United States)

An on-chip power supply noise canceller with higher voltage supply and switching transistor is proposed and the effectiveness of the canceller is experimentally verified. The noise canceller is effective for nano-second order noise caused by circuit wakeup or step increase of frequency in frequency hopping. The principle of the noise canceller is to reduce the current flowing through the supply line of VDD by injecting additional current from the higher voltage supply, so that the voltage drop across the VDD supply line is reduced. As additional current flow from higher supply, switching transistor has to be turned off not to increase the power consumption. With turn-off time of 2L/R, this current can be turned off without inducting another droop due to the increase of current flowing through the power supply line. The measurement shows the canceller reduces 68% of the noise with load circuit equivalent to 530k logic gates in 90-nm CMOS with 9% wire overhead, 1.5% area overhead, and 3% power overhead at 50k wake-ups/s. Compared to passive noise reduction, proposed noise canceller reduces power supply noise by 64% without wire overhead and to achieve same noise reduction with passive method, 77 times more C or 45 times less L is required. Too large switching transistor results in saturated noise reduction effect and higher power consumption. A rule-of-thumb is to set the on-resistance to supply 100% of load current when turned-on.

Nakamura, Yasumi; Takamiya, Makoto; Sakurai, Takayasu

56

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

DEFF Research Database (Denmark)

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

Andersen, Thomas; RØdgaard, Martin SchØler

57

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

International Nuclear Information System (INIS)

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

1993-01-01

58

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

International Nuclear Information System (INIS)

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

2006-01-01

59

Optimizacion de una fuente de alto voltaje para un laser de nitrogeno. (Optimization of a high voltage power supply for a nitrogen laser).  

Science.gov (United States)

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 recover...

L. Baly M. A. Garcia J. L. Martin

1997-01-01

60

Examination of long life pulsed power supply by using a water capacitor bank for high voltage plasma focus  

Energy Technology Data Exchange (ETDEWEB)

In the development of nuclear fusion reactors, the damage of materials due to fast neutron irradiation is an important problem that cannot be neglected. In particular, the material for the first reactor walls is subjected to the irradiation of 14 MeV fast neutrons at 10/sup 23/n/cm/sup 2/, and causes deterioration. Existing materials cannot satisfy the requirement, therfore the development of new materials is waited for. Concerning this problem, the first important subject of research is the development of a 14 MeV intense neutron source. As one of the candidates to be developed, there is high voltage plasma focus mode, and in order to realize the intense neutron source by this mode, the development of a fast, high voltage pulsed power source is a fundamental condition. It was forecast that this pulsed power source can be relatively easily designed and manufactured by adopting the intermediate water condenser method. The development of a large plasma focus and the law of proportion, the specification of a HPFM power source for an intense neutron source, the design of an intermediate water condenser, the scale-down of the power source by negative polarity charging, the examination of an empirical formula for dielectric breakdown electric field intensity and the simulation of the power source system and its design are described.

Kobata, Tadasuke; Ueno, Isao (Tokyo Univ. (Japan). Faculty of Engineering); Ikuta, Kazunari; Tanimoto, Mitsumori; Takeda, Shohei

1983-12-01

 
 
 
 
61

The examination of long life pulsed power supply by using a water capacitor bank for high voltage plasma focus  

International Nuclear Information System (INIS)

In the development of nuclear fusion reactors, the damage of materials due to fast neutron irradiation is an important problem that cannot be neglected. In particular, the material for the first reactor walls is subjected to the irradiation of 14 MeV fast neutrons at 1023n/cm2, and causes deterioration. Existing materials cannot satisfy the requirement, therfore the development of new materials is waited for. Concerning this problem, the first important subject of research is the development of a 14 MeV intense neutron source. As one of the candidates to be developed, there is high voltage plasma focus mode, and in order to realize the intense neutron source by this mode, the development of a fast, high voltage pulsed power source is a fundamental condition. It was forecast that this pulsed power source can be relatively easily designed and manufactured by adopting the intermediate water condenser method. The development of a large plasma focus and the law of proportion, the specification of a HPFM power source for an intense neutron source, the design of an intermediate water condenser, the scale-down of the power source by negative polarity charging, the examination of an empirical formula for dielectric breakdown electric field intensity and the simulation of the power source system and its design are described. (Kako, I.)

1983-01-01

62

High voltage photovoltaic power converter  

Energy Technology Data Exchange (ETDEWEB)

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

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

2001-01-01

63

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

International Nuclear Information System (INIS)

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

2008-01-01

64

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

International Nuclear Information System (INIS)

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

1993-01-01

65

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

1993-01-01

66

Laser power supply  

International Nuclear Information System (INIS)

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

1975-01-01

67

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

International Nuclear Information System (INIS)

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

1996-01-01

68

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

Energy Technology Data Exchange (ETDEWEB)

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) 25 figs.

Spassov, Velin [Sofia Univ. (Bulgaria)

1996-12-31

69

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

International Nuclear Information System (INIS)

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

2005-01-01

70

Medium and high voltage power cables market in Europe  

International Nuclear Information System (INIS)

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

1992-01-01

71

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

International Nuclear Information System (INIS)

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

2009-01-01

72

Depression in high voltage power line workers.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To investigate the association between effort-reward imbalance and depressive symptoms among workers in high voltage power lines. METHODS: A cross-sectional study among 158 workers from an electric power company in Northeast Brazil. The main independent variables were the Effort-Reward Imbalance Model (ERI) dimensions and the main dependent variable was the prevalence of depression, as measured by the Center for Epidemiologic Studies Depression (CES-D) scale. Data were analyzed by multiple logistic regression techniques. RESULTS: The group of low reward workers presented a depression prevalence rate 6.2 times greater than those in the high reward group. The depression prevalence rate was 3.3 greater in workers in the situation of imbalanced effort-reward than in those in effort-reward equilibrium. CONCLUSIONS: The prevalence of depression was strongly associated with psychosocial factors present in the work of electricity workers.

de Souza SF; Carvalho FM; de Araújo TM; Koifman S; Porto LA

2012-06-01

73

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; Leonardo Frasatto

2006-01-01

74

Computer-controlled regulated high-voltage supply  

Energy Technology Data Exchange (ETDEWEB)

A computer-controlled regulated high-voltage supply is described. The output is variable from 0 to 3 kV in 3-V steps and in 3-mV steps within 3 V. The maximum load current is 20 mA. The output-voltage ripple is about 10 mV. The temperature instability is less than or equal to 0.005%/degrees C and the drift is less than or equal to 0.02%/ 16 h of continuous operation. The described supply is used in an automated system for measuring the instability of the output current of photomultipliers.

Nakhan' kov, A.A.; Nesterov, A.Y.; Pavlovich, O.A.; Reznikov, I.V.; Sholukh, A.V.; Tverdokhlegov, E.D.

1986-02-01

75

High voltage supply for neutron tubes in well logging applications  

Energy Technology Data Exchange (ETDEWEB)

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

76

The Development of Ultra-High Voltage Power Transformer  

Energy Technology Data Exchange (ETDEWEB)

The recent economic growth of Korea and Chang Korean life style have brought the increase of power consumption, and the electric power transmission system of ultra-high voltage comes to be needed order to transmit large electric power. This paper describes a study for the development ultra-high voltage power transformer of which voltage is 765kV. (author). 9 refs., 3 figs., 3 tabs.

Kim, J.O.; Yoon, J.H.; Kim, S.C.; Kim, S.J. [Hyundai Heavy Industries Co. (Korea)

2001-07-01

77

High Voltage AC Power Transmission Lines and Communications Receiver Sites.  

Science.gov (United States)

A short discussion of the effects of the Electromagnetic Interference (EMI) radiated from High Voltage AC (HVAC) Power Transmission lines on HF Communications Receivers is followed by the description of a method for choosing communications receiver sites ...

F. R. Hill

1976-01-01

78

High voltage beam power source for high frequency heating  

Energy Technology Data Exchange (ETDEWEB)

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

Shiota, Masaru; Gotoh, Masaharu

1988-07-01

79

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

Energy Technology Data Exchange (ETDEWEB)

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

Duckworth, Douglas C. (Knoxville, TN); Marcus, R. Kenneth (Clemson, SC); Donohue, David L. (Vienna, AT); Lewis, Trousdale A. (Oak Ridge, TN)

1994-01-01

80

High voltage power condition systems powered by flux compression generators  

Energy Technology Data Exchange (ETDEWEB)

Compact, high-gain magnetic flux compressors (FCGs) are convenient sources of substantial energy for plasma-physics and electron-beam-physics experiments, but the need for high-voltage, fast-rising pulses is difficult to meet directly with conventional generators. While a variety of novel concepts employing simultaneous, axially- detonated explosive systems are under development, power-conditioning systems based on fuse opening switches and high-voltage transformers constitute another approach that complements the fundamental size, weight, and configuration of the small helical flux compressor. In this paper, we consider first a basic inductive store/opening switch circuit and the implications associated with, specifically, a fuse opening switch and an FCG energy source. We develop a general solution to a transformer/opening switch circuit---which also includes (as a special case) the direct inductive store/opening switch circuit (without transformer) and we report results of one elementary experiment demonstrating the feasibility of the approach. 9 figs.

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

1989-01-01

 
 
 
 
81

High voltage pulse supply for wire spark chamber by means of thyratron  

International Nuclear Information System (INIS)

The wire spark chamber is being operated conveniently as one of the important track measuring devices in photon-nucleus interaction experiments with the 1.3 BeV synchrotron in the Institute for Nuclear Study, the University of Tokyo. In order to get the stable operation of the chamber at high efficiency during long experimental period, the pulse supply employing a deuteron gas-filled thyratron was produced for the high voltage circuits. The thyratron used was CX-1154 (EE and V Co., Ltd.), a high performance tube of reduced time jitter, prolonged life, small internal impedance and short transition time. The pulse supply was produced by adopting modular parts, not paying special care to the power supply and its stabilization, but mainly considering long term stability and easy maintenance. Thus it was divided into a main module, a bias supply and a condenser bank. As a result, the total transition time in the high voltage circuitry was 140 ns, while the rise time of output pulses was 60 ns. It has operated stably for over 3 months repeating 2 million fires during the continuous operation at approximately 1 Hz rate. (Wakatsuki, Y.)

1976-01-01

82

A modular optically powered floating high voltage generator.  

UK PubMed Central (United Kingdom)

The feasibility of fully floating high voltage (HV) generation was demonstrated producing a prototype of a modular HV system. The primary power source is provided by a high efficiency semiconductor power cell illuminated by a laser system ensuring the floating nature of each module. The HV is then generated by dc-dc conversion and a HV multiplier. The possibility of series connection among modules was verified.

Antonini P; Borsato E; Carugno G; Pegoraro M; Zotto P

2013-02-01

83

Increased exposure to pollutant aerosols under high voltage power lines.  

UK PubMed Central (United Kingdom)

PURPOSE: To assess increased exposure to airborne pollutants near power lines by investigating theoretically and experimentally the behaviour of 222Rn decay product marker aerosols in the 50 Hz electric field under power lines. MATERIALS AND METHODS: The behaviour of aerosols in outdoor air including those carrying 222Rn decay products was modelled theoretically in the presence of an AC field. TASTRAK alpha-particle spectroscopy was used to characterize 218Po and 214Po aerosols outdoors. Sampling points were chosen along a line at right angles up to 200 m from a number of high voltage power (transmission) lines. Each sampling point comprised an arrangement of mutually orthogonal TASTRAK detectors. Exposures were carried out at different power line locations in various weather conditions. RESULTS: The model predicts a two- to three-fold increase in deposition of aerosols on spherical surfaces mimicking the human head under high voltage power lines. Experimental measurements using detectors mounted on grounded metal spheres showed an enhanced deposition of both 218Po and 214Po aerosols. Enhanced 218Po deposition on 400 kV lines ranged from 1.96+/-0.15 to 2.86+/-0.32. Enhanced 214Po deposition on 275 kV and 132 kV lines were 1.43+/-0.07 and 1.11+/-0.21, respectively, where the latter value was not significant. CONCLUSIONS: The observations demonstrate a mode of increased exposure to pollutant aerosols under high voltage power lines by increased deposition on the body. The total (indoor + outdoor) 218Po and 214Po dose to the basal layer of facial skin is estimated to be increased by between 1.2 and 2.0 for 10% of time spent outdoors under high voltage power lines.

Fews AP; Henshaw DL; Keitch PA; Close JJ; Wilding RJ

1999-12-01

84

Advances in high voltage power switching with GTOs  

International Nuclear Information System (INIS)

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

1990-01-01

85

A method for encapsulating high voltage power transformers  

Energy Technology Data Exchange (ETDEWEB)

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

Sanchez, R.O.

1990-01-01

86

Adult cancers near high-voltage overhead power lines.  

UK PubMed Central (United Kingdom)

BACKGROUND: Extremely low-frequency magnetic fields are designated as possibly carcinogenic in humans, based on an epidemiologic association with childhood leukemia. Evidence for associations with adult cancers is weaker and inconsistent. METHODS: We conducted a case-control study to investigate risks of adult cancers in relation to distance and extremely low-frequency magnetic fields from high-voltage overhead power lines using National Cancer Registry Data in England and Wales, 1974-2008. The study included 7823 leukemia, 6781 brain/central nervous system cancers, 9153 malignant melanoma, 29,202 female breast cancer cases, and 79,507 controls frequency-matched on year and region (three controls per case except for female breast cancer, one control per case) 15-74 years of age living within 1000 m of a high-voltage overhead power line. RESULTS: There were no clear patterns of excess risk with distance from power lines. After adjustment for confounders (age, sex [except breast cancer], deprivation, rurality), for distances closest to the power lines (0-49 m) compared with distances 600-1000 m, odds ratios (ORs) ranged from 0.82 (95% confidence interval = 0.61-1.11; 66 cases) for malignant melanoma to 1.22 (0.88-1.69) for brain/central nervous system cancer. We observed no meaningful excess risks and no trends of risk with magnetic field strength for the four cancers examined. In adjusted analyses at the highest estimated field strength, ?1000 nanotesla (nT), compared with <100 nT, ORs ranged from 0.68 (0.39-1.17) for malignant melanoma to 1.08 (0.77-1.51) for female breast cancer. CONCLUSION: Our results do not support an epidemiologic association of adult cancers with residential magnetic fields in proximity to high-voltage overhead power lines.

Elliott P; Shaddick G; Douglass M; de Hoogh K; Briggs DJ; Toledano MB

2013-03-01

87

Condition assessment of high voltage insulation in power system equipment  

CERN Multimedia

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

James, RE

2007-01-01

88

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

Energy Technology Data Exchange (ETDEWEB)

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

Van den Berg, J. (ed.)

2007-02-15

89

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

90

Environmental impacts of high voltage power lines and stations  

Energy Technology Data Exchange (ETDEWEB)

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

Gillich, N.; Gillich, G.R. [' Eftimie Murgu' University, Resita (Romania)

2000-07-01

91

Environmental impacts of high voltage power lines and stations  

International Nuclear Information System (INIS)

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

2000-06-02

92

A high-power high-voltage DC-DC converter for space applications  

Energy Technology Data Exchange (ETDEWEB)

The design details of a modular dc-dc converter used to power the main anode supply of a mercury-iron motor are presented. This motor, the RIT-35 built by Messerschmitt-Bolkow-Blohm (MBB), Germany, is used as the propulsion unit of a future Asteroid Gravity Optical and Radar Analysis (AGORA) mission. The design selected to cope with the high-voltage high-power conversion for space applications is shown, as well as the requirement to operate from an unregulated solar array with a voltage excursion of from 150 V at beginning-of-mission (BOM) to 240 V at end-of-mission (EOM).

Weinberg, A.H.; Schreuders, J.

1986-07-01

93

A high power high voltage dc/dc converter for space applications  

Science.gov (United States)

The design details of a modular dc/dc converter used to power the main anode supply of a mercury ion motor are presented. This motor, the RIT-35 built by M.B.B. Germany, is used as the propulsion unit of a future Asteroid Gravity Optical and Radar Analysis (AGORA) mission. This paper shows the design selected to cope with the high voltage, high power conversion for space applications and the requirement to operate from an unregulated solar array with a voltage excursion of from 150 volts beginning-of-mission (BOM) to 240 volts end-of-mission (EOM).

Weinberg, A.; Schreuders, J.

94

Ultra-high voltage electric power transmission power lines  

Energy Technology Data Exchange (ETDEWEB)

The problems of power transmission on ultrahigh d.c. electric power lines (1000-1500 kilovolts) are examined together with experimental assemblies for research in the ultrahigh voltage range. Results are given from measurements of the electrical durability of large-scale suspension intervals and insulator strings, together with recommendations on selecting insulation distances and insulator strings. The influence of the electrical field generated by ultrahigh voltage electric power lines on the environment is described, and the primary parameters of 1000-1500 kilovolt power lines are selected; a description of the support design is given. This edition is designed for specialists working in scientific-research, design and teaching institutions as well as for engineers working in the field of superhigh and ultrahigh voltage power transmission line operation.

Sherentsis, A.N.

1982-01-01

95

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.R.

1982-09-15

96

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

International Nuclear Information System (INIS)

[en] This work deals with two aspects of the use of pulsed high voltages. The first one relies on the realisation of high energy generators (W>MJ) for magnetic striction plasma experiments (Z-pinch) in order to realize intense X sources (some few keV). The system retained is an inductive storage generator which includes a fast Marx generator (T/4

1997-01-01

97

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

98

ac/dc pulse power conversion from high voltage network to JET loads  

International Nuclear Information System (INIS)

The overall ac/dc conversion equipment for the Joint European Torus (JET) experiment has a pulse power rating of about 1 GW, making it one of the largest dc installations in the world. Considering that the peak power of various loads do not coincide and assuming that one Flywheel-Motor-Generator will be used for the poloidal field load, the remaining power to be supplied from the mains is about 500 MW. A high voltage (e.g., 400 kV) interconnected network of large generating capacity and with an appropriate (500 MW) pulse load capability is available at several prospective JET sites. The maximum values allowed for reactive power, voltage drop and distortion are fixed by the local Electricity Authority and play major roles for the layout and design of the JET static power supply system. This paper deals with the design philosophy of the Toroidal Field power supply and the problems concerning the step down transformer, the filtering of harmonics and the interference between loads

1977-10-25

99

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; T.Yu. Antonets

2013-01-01

100

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

Science.gov (United States)

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

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

 
 
 
 
101

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

102

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

Energy Technology Data Exchange (ETDEWEB)

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

1981-04-01

103

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

International Nuclear Information System (INIS)

The specifications of the current crop of high-power, 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.

2009-06-05

104

Monitoring of high voltage supply using the Controller Area Network protocol  

International Nuclear Information System (INIS)

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

2011-01-01

105

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

106

Autonomous magnetocumulative power supply  

Science.gov (United States)

Helical magnetocumulative generators (MCGs) fed from explosive piezo generators (EPGs) are the most compact power supplies with an output energy of 1-10 kJ. EPGs are successfully coupled with MCGs in the operation mode and in structural parameters; these generators are easy to operate and do not require transformers or commutators. We report on the results of designing an autonomous small-size power supply based on EPGs and MCGs. Owing to bidirectional impact loading of the piezoceramic block of an EPG, the energy at the piezo generator output attains values of ˜25 J and is transferred to the helical MCG with an initial inductance of ˜1000 ?H. The power supply is constructed in the form of a monoblock with a volume of ˜2 dm3 or in the form of two separate devices connected by a high-voltage cable.

Demidov, V. A.; Sadunov, V. D.; Kazakov, S. A.; Boriskin, A. S.; Golosov, S. N.; Vlasov, Yu. V.; Utenkov, A. A.; Antipov, M. V.; Blinov, A. V.

2013-08-01

107

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

108

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

109

POWER SUPPLY  

UK PubMed Central (United Kingdom)

A power supply for feeding from power DC/DC converters parallel to a common load, wherein an output compensating circuit for improving the output voltage drop due to the voltage drop by a parallel operation diode is provided on the output side of each DC/DC converter.

ISAGO TOMIYASU; OGAWA HIROMITSU

110

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

111

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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

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

112

Dual use power supply development  

Energy Technology Data Exchange (ETDEWEB)

Size, weight, efficiency and reliability define space power systems. Then years ago NASA re-emphasized that missions such as Space Station needed cost effective critical technologies, one being power conversion. Thus, NASA began to emphasize ``dual-use`` technology through its center for Commercial Development of Space (mid 1980s). This CCDS program funded research and development efforts needed for future space missions as well as terrestrial applications for commercial markets. Maxwell and Auburn University (Space Power Institute) jointly developed reliable power systems for manned space projects as well as commercial applications of high power, high voltage switchmode power supplies. These serve the medical, scientific and industrial markets (lasers, accelerators and intense light sources). These applications required improvements in power density, efficiency, regulation, reliability and cost effectiveness to be successful. One of NASA`s first programs at Auburn and Maxwell was a high frequency, series resonant power converter optimized for commercial applications. It also meets the needs of space missions (additional space flight qualification is needed). This power converter topology demonstrates dual-use technology for power density, power-to-weight, regulation, reliability and cost effectiveness. All goals were exceeded for both space and terrestrial applications. This was the first product of NASA`s CCDS program producing a family of high voltage capacitor charging power supplies. Maxwell`s CCDS capacitor power supplies are achieving greater acceptance demonstrating the value of the CCDS program. {copyright} 1995 {ital American} {ital Institute} {ital of} {ital Physics}

Kolb, A.C.; Strickland, B.E. [Maxwell Laboratories, Inc., 8888 Balboa Avenue, San Diego, California 92123 (United States)

1995-01-25

113

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

International Nuclear Information System (INIS)

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

1991-01-01

114

Transmission of electric power at ultra-high voltages: current status and future prospects  

Energy Technology Data Exchange (ETDEWEB)

The ability to transmit larger amounts of electic power over longer distances increases with the transmission voltage. Historically, this relationship-in conjunction with its associated economies of scale-provided the basic impetus for the technological drive to utilize increasingly higher voltages for the transmission of electric power: from ''high voltage'' (HV) transmission at 100, 138, 161, and 230 kV to ''extra-high voltage'' (EHV) transmission at 345, 400, 500, and 765 kV. For the past several years, research has been under way-in this country and abroad-to bring about transmission of electric power at ''ultra-high voltage'' (UHV), i.e., voltage in the range of 1000 to 1600 kV. This paper reviews the present status of UHV transmission research and development and discusses current prospects for the introduction of UHV technology in the commercial transmission of electric power.

Scherer, H.N.; Vassell, G.S.

1985-08-01

115

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

116

A shunt active power filter applied to high voltage distribution lines  

Energy Technology Data Exchange (ETDEWEB)

The high requirement of rated power of an active power filter leads to high costs and limits the range of operation especially for high voltage applications. To overcome these problems a combined system of a passive filter, using only one LC filter tuned to the lowest typical line current harmonic, and a shunt active power filter, sharing the filter capacitor to be decoupled from the fundamental line voltage, is proposed. These features strongly decrease the rated power of the active filter which is controlled only to suppress the harmonics of higher order and to eliminate resonance effects between the line impedance and the passive filter. 8 refs, 11 figs, 1 tab

Haefner, J.; Aredes, M.; Heumann, K. [Technische Univ., Berlin (Germany). Inst.fuer Allgemeine Elektrotechnik

1995-12-31

117

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

118

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. 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.

2012-12-17

119

Fixed site monitoring of potential gradient fluctuations near to AC high voltage power lines  

International Nuclear Information System (INIS)

A fixed site monitoring station recorded the potential gradient disturbances near to two high voltage power lines during 2008. The full year's results show that the electrical environment downwind of power lines is modified compared to that upwind. Potential gradient disturbance was greater on days when there was rainfall. Humidity was inversely correlated with mean potential gradient when the station was both downwind and upwind of both power lines. Wind speed is weakly correlated with the standard deviation of a 10 minute sample of potential gradient downwind of both power lines, but not upwind. The distributions of mean and standard deviation of potential gradient in 10 minute samples showed that the field was more negative overnight and on days where there was rain, but less variable at night and on dry days. Upwind of the power lines, the average 24 hour trace exhibits the natural background Carnegie curve, with peaks corresponding to increased global thunderstorm activity, while local effects mask this trace when the FSMS is downwind of the power lines. The results show that corona ions can cause potential gradient disturbances downwind of high voltage power lines, most particularly during rain and high humidity, and overnight.

2011-06-23

120

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1993-07-01

 
 
 
 
121

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

Directory of Open Access Journals (Sweden)

Full Text Available The ever increasing progress of high-voltage high-power fully-controlled semiconductor technology continue to have a significant impact on the development of advance power electronic apparatus used to support optimized operation and efficient management of electrical grids, which in many cas-es are fully or partially deregulated networks. Developments advance both the high voltage direct-current (HVDC) power transmission and the flexibility alternating current transmis-sion system (FACTS) technologies. In this paper, an over-view of the recent advances in the area of voltage source converter (VSC) HVDC technology is provided. Selected key multilevel converter topologies are presented. Control & modeling method are discussed. It is confirmed that the con-tinuous development of power electronics present cost effec-tive opportunities for the utilities to exploit and HVDC re-mains a key technology. In particular, VSC-HVDC can ad-dress not only conventional network issues such as bulk power transmission, asynchronous network interconnection, back-to-back AC system linking and voltage/stability sup-port to mention a few, but also niche markets such as the integration of large scale renewable energy sources with the grid.

K. Pawani; Sachidanand Ojha; Rama Mishra

2012-01-01

122

High-regulation, capacitor-charging power supplies  

Science.gov (United States)

Advanced applications in the impulse radar, RF accelerator and laser industries require a high voltage capacitor charging power supply capable of voltage regulation resonant power supply combined with a patented control scheme which has demonstrated regulation = 20 nF. This regulation has been demonstrated over a product family having output powers from 2 to 10 kJ/s and output voltage up to 50 kV. The power converter utilizes IGBT switches and a transformer rectifier high voltage topology.

Strickland, Ed; Cathell, F.; Harris, Kevin; Bilak, D.; Jichetti, J.

1995-03-01

123

Preventing accidents in high voltage power distribution systems in coal mines  

Energy Technology Data Exchange (ETDEWEB)

Suggests some ways of preventing single phase grounding in high voltage power distribution systems in coal mines. Such grounding may develop into dangerous and damaging chain failures of the system. Some examples of failures of this kind in Donbass mines are given. These failures need to be averted by detection during the early stages of their development. Insulation quality should be improved to withstand underground conditions. Internal overvoltages should be reduced by suitable use of the system neutral. Vacuum switches and inbuilt isolators require overvoltage protection. More frequent inspection and maintenance are recommended.

Shutskii, V.I.; Savitskii, V.N.

1987-03-01

124

A system analysis of technological changes in the Romanian high voltage power network  

Energy Technology Data Exchange (ETDEWEB)

Increasing demand for energy requires large-scale construction of power plants and adequate growth of the transmission network. Currently, several high-voltage transmission subsystems (110, 220, 400, 500, and 750 kV) coexist in the same network. The authors investigate the mechanism of substitution of voltage for the medium-size energy system in Romania by using the Marchetti-Nakicenovic model and Romanian data of the period 1965-81. The horizon of the prediction is up to the year 2030.

Gheorghe, A.; Ermia, M.; Postolucha, P.; Stoica, M.; Zeilicovici, C.

1984-04-01

125

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

International Nuclear Information System (INIS)

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

2005-01-01

126

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

International Nuclear Information System (INIS)

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

2002-01-01

127

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

1996-01-01

128

Several problems of high-voltage thyristor rectifiers for d. c. power transmission  

Energy Technology Data Exchange (ETDEWEB)

High-voltage thyristor rectifiers are the most critical, complex and expensive components in semiconductor current converters. The primary design principles of high-voltage thyristor rectifiers are examined together with the engineering and economic prerequisites which dictate their design parameters. The advantages and drawbacks of freoncooled and gas-insulated outdoor high-voltage thyristor rectifiers are analyzed.

Berkovskii, A.M.

1982-01-01

129

High voltage fast switches for nuclear applications  

Energy Technology Data Exchange (ETDEWEB)

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

Chatroux, D.; Lausenaz, Y.; Villard, J.F. [CEA Centre de Pierrelatte, Dept. des Technologies de l' Enrichissement (DTE), 26 (France); Lafore, D. [CEGEMA-ESIM, 13 - Marseille (France)

1999-07-01

130

Airborne Power Supply Study.  

Science.gov (United States)

The airborne power supply study considers the conversion of 400 cycle aircraft power to regulated DC voltages. Topics include the review of present power conversion techniques, monolithic IC and hybrid series voltage regulators, power supply problem areas...

J. Jentz

1969-01-01

131

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

Energy Technology Data Exchange (ETDEWEB)

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

Long, W F

1982-09-01

132

Pulsed power supply for an electrostatic precipitator  

Energy Technology Data Exchange (ETDEWEB)

An electrostatic precipitator power supply circuit is described for generating voltage pulses on the precipitator while allowing a residual collection voltage to be retained on the precipitator during intervals between pulses, where the voltage of the pulses is substantially in excess of the residual voltage, the power supply circuit comprising: means for generating the high voltage pulses at the secondary inductance of a step-up transformer by discharging a capacitor through the primary inductance of the step-up transformer; the electrostatic precipitator connected to the secondary inductance of the step-up transformer to receive the high voltage pulses; and means for returning a portion of the high voltage pulses to the capacitor, and for maintaining the residual voltage on the precipitator during interpulse periods including means with a variable impedance adapted for providing a maximum impedance during interpulse periods and a minimum impedance during high voltage pulses and means for causing the variable impedance means to exhibit a minimum impedance during the return of a portion of the high voltage pulses.

Santamaria, G.T.

1986-07-15

133

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

International Nuclear Information System (INIS)

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

2008-01-01

134

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

International Nuclear Information System (INIS)

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

2005-01-01

135

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1994-12-31

136

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

137

Childhood leukaemia close to high-voltage power lines--the Geocap study, 2002-2007.  

UK PubMed Central (United Kingdom)

BACKGROUND: High-voltage overhead power lines (HVOLs) are a source of extremely low-frequency magnetic fields (ELF-MFs), which are classified as possible risk factors for childhood acute leukaemia (AL). The study was carried out to test the hypothesis of an increased AL incidence in children living close to HVOL of 225-400 kV (VHV-HVOL) and 63-150 kV (HV-HVOL). METHODS: The nationwide Geocap study included all the 2779 cases of childhood AL diagnosed in France over 2002-2007 and 30 000 contemporaneous population controls. The addresses at the time of inclusion were geocoded and precisely located around the whole HVOL network. RESULTS: Increased odds ratios (ORs) were observed for AL occurrence and living within 50 m of a VHV-HVOL (OR=1.7 (0.9-3.6)). In contrast, there was no association with living beyond that distance from a VHV-HVOL or within 50 m of a HV-HVOL. CONCLUSION: The present study, free from any participation bias, supports the previous international findings of an increase in AL incidence close to VHV-HVOL. In order to investigate for a potential role of ELF-MF in the results, ELF-MF at the residences close to HVOL are to be estimated, using models based on the annual current loads and local characteristics of the lines.

Sermage-Faure C; Demoury C; Rudant J; Goujon-Bellec S; Guyot-Goubin A; Deschamps F; Hemon D; Clavel J

2013-05-01

138

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Rhodotron is a high-voltage, high-power electron beam accelerator based on a design concept first proposed in 1989 by J. Pottier of the French Atomic Agency, Commissariat a 1'Energie Atomique (CEA). In December 1991, the Belgian particle accelerator manufacturer, Ion Beam Applications s.a. (IBA)...

Van Lancker, M.; Herer, A.; Cleland, MR; Jongen, Yves; Abs, M.; 3rd International Symposium on Ionizing Radiation and Polymers (IRaP 98)

139

Depressão em trabalhadores de linhas elétricas de alta tensão/ Depression in high voltage power line workers  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Investigar a associação entre desequilíbrio esforços-recompensas no trabalho e sintomas depressivos em trabalhadores de linhas elétricas de alta tensão. MÉTODOS: Estudo de corte transversal realizado em 158 trabalhadores de uma empresa de energia elétrica no Nordeste do Brasil. As dimensões do modelo esforço-recompensa (ERI) constituíram as variáveis independentes principais e a variável resposta foi depressão, medida pela escala Center for Epidemi (more) ologic Studies Depression (CES-D). Os dados foram analisados com técnicas de regressão logística múltipla. RESULTADOS: Trabalhadores no grupo de baixa recompensa apresentaram prevalência de depressão 6,2 vezes maior em relação àqueles no grupo de alta recompensa. A prevalência de depressão foi 3,3 vezes maior entre os trabalhadores em condição de desequilíbrio esforço-recompensa do que entre aqueles em situação de equilíbrio. CONCLUSÕES: A prevalência de depressão estava fortemente associada às dimensões de esforços e recompensas presentes no trabalho dos eletricitários. Abstract in english OBJECTIVE: To investigate the association between effort-reward imbalance and depressive symptoms among workers in high voltage power lines. METHODS: A cross-sectional study among 158 workers from an electric power company in Northeast Brazil. The main independent variables were the Effort-Reward Imbalance Model (ERI) dimensions and the main dependent variable was the prevalence of depression, as measured by the Center for Epidemiologic Studies Depression (CES-D) scale. D (more) ata were analyzed by multiple logistic regression techniques. RESULTS: The group of low reward workers presented a depression prevalence rate 6.2 times greater than those in the high reward group. The depression prevalence rate was 3.3 greater in workers in the situation of imbalanced effort-reward than in those in effort-reward equilibrium. CONCLUSIONS: The prevalence of depression was strongly associated with psychosocial factors present in the work of electricity workers.

Souza, Suerda Fortaleza de; Carvalho, Fernando Martins; Araújo, Tânia Maria de; Koifman, Sergio; Porto, Lauro Antonio

2012-06-01

140

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

International Nuclear Information System (INIS)

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

1987-07-01

 
 
 
 
141

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

Science.gov (United States)

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

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

142

Power supply for superconductor  

International Nuclear Information System (INIS)

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

1979-01-01

143

Preferred external power supplies  

International Nuclear Information System (INIS)

[en] In June 2008 ANAV and ENDESA DISTRIBUCION (EDE) undertook a joint study of Asco NPP Preferred External Power Supplies (PEPSs) to check the number of lines or power supplies to the 110 kV substation at Asco that met the criteria defined in the power supply regulations applicable to Asco NPP and primarily to confirm compliance with IEEE 765-2006 standard. (Author).

2010-01-01

144

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1998-10-01

145

ABB connects up its motor with the high voltage; ABB met son moteur sous haute tension  

Energy Technology Data Exchange (ETDEWEB)

A synchronous high voltage motor, named 'Motorformer', has been developed by ABB company (Vaesteras, Sweden). This motor can be directly supplied by the high voltage power network and requires less energy and maintenance. In the Motorformer, the traditional stator coil is simply replaced with high voltage resistant cables. This concept is inspired by the Powerformer high voltage generator developed by ABB three years ago. Short note. (J.S.)

Bonneau, C.

2001-03-01

146

Accelerated aging of high voltage stator bars using a power electronic converter  

Energy Technology Data Exchange (ETDEWEB)

The use of computer-aided partial discharge detectors has become an increasingly useful tool in the application of insulation condition monitoring. The problem that exists is the lack of field and laboratory data associated with the faults, that the condition monitoring is aimed at finding. A stator winding aging bed has been constructed to allow the monitoring of the growth of induced faults, for comparison with field measurements. The use of a low emission, variable frequency power electronic converter along with a computer based discharge analyzer, has allowed the study of supply frequency dependence of partial discharge activity along with the monitoring of fault initiation and development. The layout of the aging bed is discussed along with the operating performance of the variable frequency converter and partial discharge results gathered.

Sheehy, R.C.; Blackburn, T.R. [Univ. of New South Wales, Sydney, New South Wales (Australia). Electrical Power Dept.; Rungis, J. [CSIRO, Sydney, New South Wales (Australia). Div. of Applied Physics

1996-12-31

147

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.

1979-06-28

148

MOS power transistor and ceramic thyratron for fast high voltage pulser  

International Nuclear Information System (INIS)

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

1984-05-01

149

MOS power transistor and ceramic thyratron for fast high voltage pulser  

Energy Technology Data Exchange (ETDEWEB)

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

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

1984-05-01

150

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

151

The impact of an increasing amount of wind power on the high voltage grid of Costa Rica  

Energy Technology Data Exchange (ETDEWEB)

The objective of the Costa Rica grid feed-in study is to determine the effect of an increasing amount of wind power on the stability of the high voltage grid of Costa Rica. Due to a favourable wind climate, the amount of wind power in Costa Rica is increasing steadily. There is some concern about the effect of fluctuating wind power on the frequency and voltage variations of the grid. Especially the loss of a large amount of wind power in a very short time, 30 second to a few minutes, is expected to result in a frequency control problem. This study intends to quantify this problem. The method used is twofold: dynamic simulations of the High Voltage grid of Costa Rica, including existing and future wind farms, are used to study the effect of wind power variations on the frequency stability; the probability of wind speeds exceeding 25 m/s at different locations at the same time is determined, in order to estimate the chance of cut-out of a complete wind farm in a short period of time.

Pierik, J.T.G.; Van Engelen, T.G.; Winkelaar, D. [ECN Wind Energy, Petten (Netherlands); Montero, J.C.; Sancho, R. [Instituto Constaricense de Electricidad ICE-LSSP, San Jose (Costa Rica)

2003-06-01

152

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

Scientific Electronic Library Online (English)

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

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

1999-06-01

153

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

Directory of Open Access Journals (Sweden)

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

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

1999-01-01

154

PMTs applied circuitry--optimum design of high voltage generator  

International Nuclear Information System (INIS)

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

1992-01-01

155

High power pulse magnetic field power supply system  

International Nuclear Information System (INIS)

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

2007-01-01

156

Maternal exposure to magnetic fields from high-voltage power lines and the risk of birth defects.  

UK PubMed Central (United Kingdom)

The issue of adverse human health effects due to exposure to electromagnetic fields is still unclear, and congenital anomalies are among the outcomes that have been inconsistently associated with such exposure. We conducted a population-based, case-control study to examine the risk of congenital anomalies associated with maternal exposure to magnetic fields (MF) from high-voltage power lines during pregnancy in a community in northern Italy. We identified 228 cases of congenital malformations diagnosed in live births, stillbirths, and induced abortions among women living in the municipality of Reggio Emilia during the period 1998-2006, and a reference group of healthy newborns was matched for year of birth, maternal age, and hospital of birth. We identified maternal residence during early pregnancy and used Geographic Information System to determine whether the residences were within geocoded corridors with MF ?0.1 ?T near high-voltage power lines, then calculated the relative risk (RR) of congenital anomalies associated with maternal exposure. One case and 5 control mothers were classified as exposed, and the RR associated with MF ?0.1 ?T was 0.2 (95% CI: 0.0-2.0) after adjusting for maternal education. While small or moderate effects may have gone undetected due to low statistical power, the results of this study overall do not provide support for major effects of a teratogenic risk due to exposure to MF during early pregnancy.

Malagoli C; Crespi CM; Rodolfi R; Signorelli C; Poli M; Zanichelli P; Fabbi S; Teggi S; Garavelli L; Astolfi G; Calzolari E; Lucenti C; Vinceti M

2012-07-01

157

High Voltage Electrostatic Pendulum  

CERN Multimedia

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

158

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

Science.gov (United States)

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

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

159

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2010-07-01

160

Power supply and ethics  

International Nuclear Information System (INIS)

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

2004-01-01

 
 
 
 
161

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

162

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

International Nuclear Information System (INIS)

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

2001-01-01

163

Offshore Wind Power Impact on the Loading of the Belgian High Voltage Grid  

Energy Technology Data Exchange (ETDEWEB)

The aim of this work is the study and analysis of the response of the Belgian grid to the injection of an increased offshore wind power input. Many factors play a role in the wind power production such as the season of the year, the time of day or the total amount of installed power. These factors were studied as well as the way they influence the offshore power output and the management of this behaviour in the grid benefit. The power flows in every line, the possible overloads, the most critical cases were reflected, and the corresponding conclusions were drawn.

Perez, P. Souto [National Renewable Energy Centre CENER, Sarriguren, Navarra (Spain); Soens, J.; Driesen, J.; Belmans, R. [Katholieke Universiteit KU Leuven, Leuven (Belgium)

2006-07-01

164

Microcontroller Based Power Supply  

Directory of Open Access Journals (Sweden)

Full Text Available 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 goal of developing a generalized power supply that has programmable output voltage and current. It is able to recognize faults and take corrective actions to prevent any permanent damage to the system. The system discussed here is capable of functioning independently by its own without any intervention from the user. The system finds application at remote sites to automatically manage primary (AC) and secondary (Battery) power sources to provide smooth uninterrupted power output even during switchovers between AC and DC power sources. It would also be helpful to insurance companies who expect that the products covered by them be reliable, robust and not prone to be damages.

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

2006-01-01

165

Power supplies and accelerators  

CERN Multimedia

The paper is intended to provide an introduction to the magnets employed in a circular particle accelerator to bend and steer the charged-particle beam. These are the principal loads that power converter engineers will encounter and the basic concepts of the accelerator lattice are presented, without assuming any prior knowledge. The interface with the power converters is examined and the need to optimize the supply and the load together is highlighted.

Marks, N

2006-01-01

166

APS power supply controls  

Energy Technology Data Exchange (ETDEWEB)

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

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

1994-03-31

167

APS power supply controls  

International Nuclear Information System (INIS)

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

1994-01-01

168

High Voltage Generation for Physics Lab  

CERN Document Server

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

169

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

Energy Technology Data Exchange (ETDEWEB)

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

Carcano, C.; Oliva, P. [ENEL SpA, Rome (Italy); Voyatzakis, J. [Public Power Corp., Athens (Greece)

1996-12-31

170

Switched power workshop: Power supply working group  

Energy Technology Data Exchange (ETDEWEB)

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.

Haseroth, H.; Hopkins, D.; Ikezi, H.; Kirbie, H.C.; Lincke, E.; Wilson, M.

1989-04-14

171

Switched power workshop: Power supply working group  

International Nuclear Information System (INIS)

[en] 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

1989-01-01

172

X-Ray Examination of Insulation in Lapped High Voltage Underground Power Transmission Cables.  

Science.gov (United States)

The equipment and method used in a radiographic system for detecting defects in the electrical insulation on underground power transmission cables are described. The BNL x-ray system has been used to check the integrity of 230 kV paper-oil cables which ha...

A. C. Muller

1979-01-01

173

High voltage, outdoor, air cooled, dynamic braking resistors and power distribution system incorporating the same  

Energy Technology Data Exchange (ETDEWEB)

An electrical resistor having first and second cylindrical resistance windings helically wound closely adjacent to one another about a common axis and wound in opposite directions about such axis. The helical windings of the resistor are connected in parallel and the resistor is provided with terminals for placing it in series with a circuit to provide a resistance in such circuit. The resistors are used in a power distribution system that includes a first system connected to a second system by a tie line. The resistors referred to as braking resistors are located adjacent to at least one of the power sources and are connected to the tie line through one or more circuit breakers.

Burke, P.E.

1989-09-26

174

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1999-06-01

175

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

UK PubMed Central (United Kingdom)

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

Su C; Shao Z; Lin Y; Wu Y; Wang H

2012-09-01

176

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

Science.gov (United States)

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

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

2012-08-07

177

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

Science.gov (United States)

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

Kraus, Robert; Myers, Ira; Baumann, Eric

178

Engineering Design of the ITER AC/DC Power Supplies  

Energy Technology Data Exchange (ETDEWEB)

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

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

2009-02-15

179

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

180

Switched mode power supplies  

International Nuclear Information System (INIS)

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

1983-03-01

 
 
 
 
181

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; KHAN Md. Arif; SHARMA Arvind; THOMBRE Ashish Digambar

2013-01-01

182

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  

Energy Technology Data Exchange (ETDEWEB)

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)

Tochio, Atsushi [Institute of Nuclear Technology, Institute of Nuclear Safety System, Inc., Mihama, Fukui (Japan); Kaneda, Yoshiharu [Advanced Technology R and D Center, Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan); Urakawa, Nobuo [Mitsubishi Electric Corp., Tokyo (Japan)

2000-09-01

183

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

184

Power Supplies for Precooler Ring  

Energy Technology Data Exchange (ETDEWEB)

Eight power supplies will energize the antiproton Precooler ring. there will be two series connected supplies per quadrant. These supplies will power 32 dipole and 19 quadrupole magnets. The resistance and inductance per quadrant is R = 1.4045 Ohms and L = 0.466. Each powr supply will have 12-phase series bridge rectifiers and will be energized from the 480 V 3-phase grid. The total of eight power supplies are numbered IA, IIA, IIIA, IVA, and IB, IIB, IIIB, and IVB. Each quadrant will contain one A and one B supply. A block diagram of the Precooler ring with its power supplies is shown in Figure 1.

Fuja, Raymond; Praeg, Walter

1980-12-12

185

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

UK PubMed Central (United Kingdom)

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

Gao Z; Gui P

2012-07-01

186

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

187

Research and development of high voltage linear fiber isolation system  

International Nuclear Information System (INIS)

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

2007-01-01

188

Chemical power supply  

Energy Technology Data Exchange (ETDEWEB)

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

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

1983-08-09

189

The RADAN SEF-303A, a small high-current pulsed power supply  

International Nuclear Information System (INIS)

[en] The characteristics of a small periodic-pulse high-current power supply based on Blumlein generator combined with a resonance high-voltage transformer with an open ferromagnetic core are described. The power-supply output voltage is finely tuned in the range of 30--300 kV, the pulse duration is 4 nsec, and the rise time is

1993-01-01

190

The Upgraded CMS Preshower High Voltage System  

CERN Multimedia

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

Vichoudis, Paschalis

2013-01-01

191

The upgraded CMS Preshower high voltage system  

International Nuclear Information System (INIS)

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

2013-01-01

192

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

International Nuclear Information System (INIS)

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

2012-01-01

193

Transformerless high voltage bias for Si-PIN detector  

International Nuclear Information System (INIS)

Utilizing the circuit of charge pump, voltage multipliers, and linear voltage regulator, a transformerless DC-DC converter was designed in order to produce a high voltage bias of +100 volts for Si-PIN detector from single +5 volt supply. The converter turns out to be small in size, featuring high stability, low ripple noise and low power consumption. (authors)

2004-01-01

194

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper presents both time-domain and frequency-domain simulated results of a novel marine hybrid renewable-energy power generation/energy storage system (PG/ESS) feeding isolated loads through an high-voltage direct current (HVDC) link. The studied marine PG subsystems comprise both offshore win...

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

195

High-voltage test stand at Livermore  

International Nuclear Information System (INIS)

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

1977-10-29

196

Switching Power Supplies  

Science.gov (United States)

Created by Work-Ready Electronics, a project of the Advanced Technological Education program, this module walks visitors through the basics of switching power supplies. The content of the site is divided into four areas: SMPS Basics and Switching Regulators; DC-DC Converters: Charge Pumps, Forwards Converters and Flyback Converters; Inverters, UPS and Hysteresis Curve, and SMPS: Advantages, Disadvantages and Troubleshooting. There is a quiz for each area in the Knowledge Probe area, and the Learning Resources section contains five activities to help cement student understanding. There are also further resources - both print and Web based - for more information and two Questors, a Flash trivia game. The Notebook function allows visitors to take notes and review them at any time. This is an excellent resource students and educators in electronics technician programs.

2008-09-05

197

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

International Nuclear Information System (INIS)

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

1999-05-02

198

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.

1993-01-01

199

Resonance power supplies for large accelerator  

Energy Technology Data Exchange (ETDEWEB)

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.

Karady, G. [Arizona State Univ., Tempe, AZ (United States); Schneider, E.J. [Los Alamos National Lab., NM (United States)

1993-03-01

200

Energy discharge heater power supply  

Energy Technology Data Exchange (ETDEWEB)

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

Jaskierny, W.

1992-11-01

 
 
 
 
201

Energy discharge heater power supply  

Energy Technology Data Exchange (ETDEWEB)

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

Jaskierny, W.

1992-11-01

202

Energy discharge heater power supply  

International Nuclear Information System (INIS)

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

1992-01-01

203

Magnet power supply for ISABELLE  

International Nuclear Information System (INIS)

The power supply system which will energize the superconducting magnets in the ISABELLE machine consists of some 520 computer-programmable power supplies with outputs ranging from 50 A to 4500 A. Most of the power supplies will be used for the correction of field harmonics, orbit correction and adjustment of the machine working line. During acceleration, currents in various magnet correction coils will be controlled in real time to track the main field; all power supplies must be highly stable during the stacking and storage of the beam (in some cases current regulation must be in the order of 0.001%). PS reference programs will be stored in microprocessor based function generators embedded in each power supply. Due to the large amount of stored energy in the system, the magnets must be protected during quenches. Details of the power supply and of the magnet quench protection system are described

1979-03-14

204

High voltage equipment for the next generation electric power distribution systems in Japan; Hoogspanningsapparatuur voor de volgende generatie elektriciteitsdistributie in Japan  

Energy Technology Data Exchange (ETDEWEB)

One of the most important challenges for the Japanese energy industry is to supply densely populated areas with sufficient energy. Several options to guarantee the supply of electricity are discussed, e.g. UHV technology, fast earthing systems and gas-insulated switchgear. Also developments to design computer programs to simulate the fundamental UHV processes are in progress, although results are not expected before the year 2000. A state-of-the-art with respect to high voltage equipment research in Japan is given. 3 figs., 4 refs.

Cliteur, G. [High Power Laboratory, Toshiba, Kawasaki (Japan); Van Blokland, A. [Scientific Office, Royal Netherlands Embassy, Tokyo (Japan)

1996-12-31

205

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

2013-01-01

206

High-voltage coaxial switch  

Energy Technology Data Exchange (ETDEWEB)

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

Rink, J.P.

1981-06-03

207

High-voltage pulse generating circuit suitable for extracorporeal defibrillator  

UK PubMed Central (United Kingdom)

The invention relates to a high-voltage pulse generating circuit suitable for an extracorporeal defibrillator. The high-voltage pulse generating circuit comprises a charging circuit and a discharging circuit. The charging circuit is based on a flyback switch power supply and controlled by a current-type pulse width regulation controller. By properly breaking the charging circuit by means of sampling current and voltage, high voltage is maintained within a determined range. The discharging circuit comprises an opto-coupler and a biphase bridge circuit consisting of isolated gate bipolar transistors IGBT. The opto-coupler controls the opening and closing of the isolated gate bipolar transistors IGBT and simultaneously isolates the high voltage and a single chip microcontroller and protects other low-voltage parts of the circuit. The isolated gate bipolar transistors IGBT form a switch circuit, releases the high voltage which is stored on an energy storage capacitor with large capacity by the charging circuit according to biphasic index chopped wave with predetermined parameters, and applies the high voltage to a human body so as to finish the defibrillating action.

LI WEN

208

HTR-10 power supply system  

International Nuclear Information System (INIS)

[en] HTR-10 Power supply system is an important system set up to achieve HTR-10's safety and operation goal. The structure and configuration of HTR-10 power supply system are introduced and operating patterns in different conditions are described

2001-01-01

209

Latest HIC power supply technique  

Energy Technology Data Exchange (ETDEWEB)

Miniaturization of switching power supplies centering around portable devices of office automation equipment is in progress and one of the techniques supporting it is to make a switching power supply with HIC's. This article outlines the technical trends and issues concerning switching power supplies composed of HIC's. Also for realization of a MH2 power supply which is considered to become the main current in the future, the above approach of making the power supply with HIC's is one of the indispensable conditions. The first step for a HIC power supply, namely composing semiconductors and control circuits of HIC's, the second step, namely compounding HIC's centering around semiconductor parts and making peripheral parts of semiconductor parts to be a module, furthermore the third step, namely making the power supply in toto with HIC's are currently being put to practical use and hereafter development of compilation, etc. including the input AC component must be developed. As the issues for study on HIC power supply, the following can be listed; establishment of MH2 converters by circuit technology, development of magnetic parts, condensers, semiconductor parts and wiring material, etc. and establishment of low loss wiring technique. 6 refs., 4 figs.

Tabuchi, Katsumi; Shinsha, Junji (Matsushita Electric Components Co., Ltd., Osaka, (Japan))

1989-08-25

210

Power Supply Transient Response Tester.  

Science.gov (United States)

A unit was designed to control a mercury-wetted contact relay. The contacts of the relay were used to switch a noninductive resistive load on and off a regulated power supply. If an oscilloscope is connected to the output terminals of the power supply, th...

A. J. Stevens

1972-01-01

211

Nuclear reactor power supply  

International Nuclear Information System (INIS)

[en] 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 protection system has a number of separate protection units, each unit receiving the process signals from the like sensors of each assembly in its turn. The sets of process signals derived from the sensor parameter assemblies are each in its turn transmitted from the protection system to the control system which impresses control signals on the reactor or its components to counteract the tendency for conditions to drift off-normal status requiring operation of the protection system. A parameter signal selector is interposed between the protection system and the control system. This selector prevents a parameter signal of a set of signals, which differs from the other parameter signals of the set by more than twice the allowable variation of the sensors which produce the set, from passing to the control system. The connection between the protection units and the selector is four separate fiber optic channels so that electrical interaction between the protection units and the selector or control system is precluded. The selectors include a pair of signal selection units, one unit sending selected process signals to primary control channels and the other sending selected process signals to back-up control channels. Test signals are periodically impressed on a selected pair of a selected unit and control channels. When test signals are so impressed the selected control channel is disabled from transmitting control signals to the reactor and/or its associated components

1984-01-01

212

Pulsed High-Voltage Generator using Semiconductor Opening Switch  

Science.gov (United States)

A pulsed high-voltage generator has been developed using semiconductor opening switch (SOS), based on inductive-energy-storage scheme. It is very compact and is capable of continuous repetitive operation at 1 kHz. A static-induction thyristor is used as the primary switch and a saturable magnetic core is used as both the step-up transformer and the magnetic switch. With DC power supply of 1.6 kV, it generates pulsed high-voltage output of ?27 kV on resistive load of 500?, with pulse width of ?30 ns.

Jiang, Weihua

213

Portable gas laser and power supply  

Energy Technology Data Exchange (ETDEWEB)

A laser head uses nitrogen gas to provide output in the far ultraviolet region of radiation. The laser is supplied from an energization system including low voltage and high voltage sections. The low voltage section is supplied from a low d-c voltage, stepped up over a transformer and applied as pulses to a high voltage section, including a voltage doubler circuit. The doubler circuit includes two diode assemblies, and this circuit provides the high voltage pulses for energizing the laser head when a spark gap breaks down. The opposed electrodes of the laser head each have a serrated edge, and the serrated edges face each other to effect a pre-ionization of the gap between the electrodes. A capacitor, coupled across the laser head electrodes , has a particular construction to withstand the repeated, very rapid discharges occasioned for firing the laser, and this capacitor contributes to a laser construction which is truly portable.

Robbins, G.A.

1980-05-06

214

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

1993-01-01

215

SNS Standard Power Supply Interface  

CERN Document Server

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

Peng, S; Oerter, B; Smith, J

2001-01-01

216

High Voltage Cable.  

Science.gov (United States)

The coaxial cable is for the transmission of high voltage direct current. The cable is for use with a charged particle accelerator. The cable structure includes a nonconducting core, a center conductor, two intermediate conductors, all separated by dielec...

C. A. Harris

1965-01-01

217

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

UK PubMed Central (United Kingdom)

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

Hegger C; Reedijk AM

2013-01-01

218

Multiple resonant railgun power supply  

Energy Technology Data Exchange (ETDEWEB)

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

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

1988-01-01

219

Standby power supply for motor  

Energy Technology Data Exchange (ETDEWEB)

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

Law, H.

1987-08-05

220

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

Directory of Open Access Journals (Sweden)

Full Text Available A pulsed-dc power supply has been designed and constructed for use in a magnetron sputtering system and forthin film synthesis. The power supply consists of three major parts: (1) two high voltage direct current (dc) power suppliesutilizing a phase control circuit for power delivery, (2) pulse generator and two power switching circuits, and (3) feedbackcircuits for current and voltage controls, displays, and safety measures. For a high level of safety operation, opticalconnections were employed in the circuit design for complete isolation between low and high voltage sections. Theconstructed power supply was tested using a test load consisting of ten 100 W 250 V light bulbs with tungsten filamentsconnected in series. It was found that the power supply was capable of supplying either symmetric or asymmetric pulsed-dcpower of maximum peak-to-peak voltage of 1250 V. The negative and positive pulse widths were selectable between 10-100 ?s, with maximum pulse frequency of 30 kHz. This frequency limit is due to the limited speed of the power transistors used in the power switching circuit operating at high voltage. It is anticipated that the constructed power supply can be used as a plasma generator in a magnetron sputtering system for the deposition of oxide thin films such as Al2O3, NaxCo2O4, ITO and ZnO.

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

2007-01-01

 
 
 
 
221

Repetitive resonant railgun power supply  

Energy Technology Data Exchange (ETDEWEB)

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

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

1988-01-01

222

Development of an IGBT converter for a magnet power supply  

International Nuclear Information System (INIS)

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

1998-01-01

223

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

International Nuclear Information System (INIS)

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

2011-01-01

224

A Robust Modular IGBT Power Supply for Fusion Science Applications  

Science.gov (United States)

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

Ziemba, Timothy; Miller, Ken; Prager, James

2010-11-01

225

High-voltage impulse generating circuit suitable for external defibrillator  

UK PubMed Central (United Kingdom)

The utility model relates to a high voltage pulse generating circuit for external defibrillators, belonging to technical field of medical equipments, which mainly comprises a charging circuit and a discharging circuit. The utility model is characterized in that the charging circuit is based on a reverse excitation switching power supply and controlled by a current mode pulsewidth-modulated controller the charging circuit is switched off timely via a sample current and voltage, thereby enabling the high voltage to be kept within set scope the discharging circuit is formed by a two-phase bridge circuit comprising an optocoupler and an insulated-gate bipolar transistor IGBT the optocoupler controls the switching of the insulated-gate bipolar transistor IGBT, isolates the high voltage and a single-chip microcomputer, and protects other low-voltage parts of the circuit the insulated-gate bipolar transistor IGBT forms a switch circuit and releases the high voltage stored in a large value energy storage capacitor through the charging circuit according to two-phase index chopped wave with specified parameters, then the high voltage is applied to body for defibrillation.

WEIJIAO LI; ZUXIANG FANG; HAIFENG LU; HAILANG SONG; YU ZHOU; XIN GE

226

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

International Nuclear Information System (INIS)

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

2005-01-01

227

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

International Nuclear Information System (INIS)

[en] 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)

1987-01-01

228

Development of Disturbance Power Supply  

Energy Technology Data Exchange (ETDEWEB)

The characteristic responds of load respect to various disturbances which can usually be occurred on actual power system is very important to analyze performance and to improve load with high-technology. The disturbance power supply is designed to provide wide range of power to testing load. This device uses PLC technology to dynamic characteristic experiment and CVVF to change frequency. Also this instrument includes data acquisition system to obtain reliable data from experiment. (author). 6 refs., 7 figs., 1 tab.

Ji, P. S. [Chungju National University (Korea); Lee, J. P.; Lim, J. Y. [Daedok College (Korea)

2002-07-01

229

Power supplies in Europe  

International Nuclear Information System (INIS)

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

1992-01-01

230

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1994-06-23

231

The German power supply situation  

International Nuclear Information System (INIS)

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

2005-01-01

232

Non-isolated DC-AC converter with high voltage gain for autonomous systems of electric power; Conversor CC-CA nao isolado com alto ganho de tensao para aplicacao em sistemas autonomos de energia eletrica  

Energy Technology Data Exchange (ETDEWEB)

A non-isolated DC-AC converter with high voltage gain with two output sinusoidal voltage - 110 V and 220 V - and frequency 60 Hz for application in autonomous systems of electric power is proposed in this work. This topology consists of a boost converter with high voltage gain, based on three-state switching cell combined with a double half bridge inverter. This configuration type the size and the cost are reduced and the efficiency is gotten better, due to the reduced number of switches. The converters that compose this topology operate with high frequency, reducing the volume of the magnetic materials. can be mention as important characteristics: the voltage stress across the switches of the boost converter are low, due they be naturally clamped by one output filter capacitor, which allows the utilization of switches with lower conduction resistances, and the waveforms of the output voltage of the double half bridge inverter supplies for the load it is sinusoidal and it possesses low harmonic content. (author)

Silveira, George Cajazeiras [Centro Federal de Educacao Tecnologica do Ceara (CEFET/CE), Fortaleza, CE (Brazil); Torrico-Bascope, Rene P. [Universidade Federal do Ceara (PPGEE/UFC), Fortaleza, CE (Brazil). Programa de Pos Graduacao em Engenharia Eletrica; Borges Neto, Manuel Rangel [Centro Federal de Educacao Tecnologica de Petrolina (CEFET-PET), PE (Brazil)

2008-07-01

233

High voltage pulse conditioning  

Energy Technology Data Exchange (ETDEWEB)

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

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

1990-01-01

234

High voltage pickup plate  

International Nuclear Information System (INIS)

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

1989-01-01

235

TPX power supply design and performance  

International Nuclear Information System (INIS)

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

1995-01-01

236

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

Science.gov (United States)

The aim of this study was to carry out theoretical investigations of power frequency magnetic fields (MFs), produced inside and outside the domain of urban 110-kV power substations and to establish a correspondence between the levels of the fields and the specified population limits as defined by Ukrainian regulations. The fields produced by high-voltage substations were studied based on the application of the numerical finite element methodology. The investigations have shown that magnetic flux density values calculated inside and outside the considered 110-kV power substations do not reach the exposure limits specified by the Ukrainian regulations (1750 ?T) and by international guidelines (ICNIRP 2010). Inside the domain of the substation, the maximum value of MFs was found under the 10-kV busbars and it equalled 420 ?T. PMID:23070485

Okun, Oleksandr; Shevchenko, Sergey; Korpinen, Leena

2012-10-15

237

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

UK PubMed Central (United Kingdom)

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

Okun O; Shevchenko S; Korpinen L

2013-05-01

238

Design and test of power supply system for ATLAS muon spectrometer  

CERN Document Server

In this paper, the problem of the Low Voltage (LV) and High Voltage (HV) power supply distribution of the MDT (Monitored Drift Tubes) detector is addressed. Due to the high number of channels (1168 for low voltage and twice for high voltage) involved and to the dimension of the apparatus, these power supply systems are very complicated. Both system are made of three different parts: a power generator, a system controller and an active distributor. The first two parts will be localized in the cavern close to the experimental area, so they are subjected to standard environmental conditions. The third part (the active distributor) will be placed in the experimental area on the platforms just outside the detector, where the environmental conditions are more severe, due to the presence of magnetic field (about 800 Gauss) and radiations. In the following we present the design specifications and tests for the power supply systems. (3 refs).

Beretta, M; Vandelli, Wainer R; Mikenberg, G; Richter, R

2004-01-01

239

Homopolar generator power supply system  

Energy Technology Data Exchange (ETDEWEB)

A high-energy, high-current homopolar generator pulsed power supply system that is compact and field portable. The power supply system includes a homopolar generator (HPG), an auxiliary supply and drive system, both mounted on a skid frame, and a control system coupled to the HPG and drive system. The homopolar generator has a split rotor with insulation between the halves and a recess in the periphery. A stator ring and field coil, for producing a magnetic field through which the rotor halves make two simultaneous voltage-generating passes, are disposed within the recess in the rotor. Air-actuated brush mechanisms inside and outside the recess contact surfaces of the rotor and collect discharge current. The auxiliary supply and drive system includes a motoring system comprising hydraulic motors for driving the HPG to speed, a bearing lubrication system, a generator for energizing the field coil, and a brush actuator air supply system, all of which are driven by a prime mover. The control system comprises a logic controller for executing a prescribed sequence of steps including turning on the prime mover, initiating motoring of the HPG, energizing the field coil, and initiating the discharge of electrical current.

Weldon, W. F.; Gully, J. H.

1985-10-01

240

Power supply system for negative ion source at IPR  

International Nuclear Information System (INIS)

The first step in the Indian program on negative ion beams is the setting up of Negative ion Experimental Assembly - RF based, where 100 kW of RF power shall be coupled to a plasma source producing plasma of density ?5 x 1012 cm-3, from which ? 10 A of negative ion beam shall be produced and accelerated to 35 kV, through an electrostatic ion accelerator. The experimental system is modelled similar to the RF based negative ion source, BATMAN presently operating at IPP, Garching, Germany. The mechanical system for Negative Ion Source Assembly is close to the IPP source, remaining systems are designed and procured principally from indigenous sources, keeping the IPP configuration as a base line. High voltage (HV) and low voltage (LV) power supplies are two key constituents of the experimental setup. The HV power supplies for extraction and acceleration are rated for high voltage (?15 to 35kV), and high current (? 15 to 35A). Other attributes are, fast rate of voltage rise (

2010-02-01

 
 
 
 
241

Investigation of a high voltage hollow cathode electron beam source  

International Nuclear Information System (INIS)

[en] An investigation is presented of the possibility of developing an electron accelerator comprising several radiation units with a relatively low power per unit, and without the many elements such as accelerator tube, focusing and scanning systems. A study was desired of an electron gun operated at 200 kV vased on the cold, hollow-cathode principle, where problems concentrated on the design of an electrode configuration that could withstand the high voltage at a pressure where a plasma could be generated too. Studies concentrated on the high voltage breakdown criterion in the pressure range 10-3 to 10-2 torr and on the plasma formation in a low pressure gas discharge. Controlled beams with energies up to 130 keV were generated in nitrogen at a pressure of 2 x 10-3 torr with a beam current of about 1 mA in a continuous operation. The high voltage was limited by the existing power supply in the laboratory; however, a decision was taken not to purchase a power supply that could have delivered the required voltage. (author)

1977-01-01

242

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

International Nuclear Information System (INIS)

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

2009-01-01

243

Sensors for Detection of Gases in High-Voltage Power Transformers: A Research Program for Understanding and Improving Their Performance.  

Science.gov (United States)

The operation of metal-insulator-semiconductor (MIS) sensors is described. These devices are sensitive detectors of hydrogen and can be used for the purpose to monitoring hydrogen in highvoltage power transformers. The utility of these devices could be in...

M. D. Allendorf A. E. Lutz R. Bastasz D. J. Klinke

2000-01-01

244

Thyristor power supplies for thermonuclear reactors  

International Nuclear Information System (INIS)

[en] Possibilities and limitations of using two types of thyrjstor power sUpplies for thermonuclear reactors are shown: from a commercial power supply system; from an autonomous electric generator. Limitations due to admissible level of fluctuations and distortions in the supply voltage at the point of thyristor power supply system connection are considered. It is shown that the limitation as to the nonsinusoidality coefficient for regimes of power supply system operation is weaker than the limitation as to the voltage fluctuations. Structural features of power supply systems of both types, layout of power part of the thyristors and their protection in emrgency regimes are considered

1982-01-01

245

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

Science.gov (United States)

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

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

2011-11-01

246

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 ...

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

247

High voltage feedthrough bushing  

Energy Technology Data Exchange (ETDEWEB)

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

Brucker, J.P.

1991-12-31

248

High voltage feedthrough bushing  

Energy Technology Data Exchange (ETDEWEB)

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

Brucker, John P. (Espanola, NM)

1993-01-01

249

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

Science.gov (United States)

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.

Shim, Eun-yong; Ahn, Il-kun; Seo, Tae-won; Lee, Seung-kyo; Bae, Young-soon; Joung, Jin-Hyun; Joung, Mi

2012-09-01

250

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

International Nuclear Information System (INIS)

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

2001-01-01

251

Increase of losding capability of power high-voltage thyristor modules in electrophysical equipment power supply systems  

International Nuclear Information System (INIS)

[en] Investigations on measurement and time distribution of commutator losses when switching on thyristors of the TB-2000 type and reversely turned dinistors are carried out. Quantity of sequential thyristors is 8. Cooling channels are made in the form of the double Archimed spiral. 2 refs.; 2 figs

1989-01-01

252

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

1997-01-01

253

Design of thyristor power supply regulator  

International Nuclear Information System (INIS)

[en] The author gives transmission-function of rectification of thyristor power supply. The authors designed regulator based on principle of automatic control system. The regulator has been employed in MI2 power supply for HIRFL. It is satisfying results for power supply

2001-01-01

254

Power supply control protocol used at GANIL  

International Nuclear Information System (INIS)

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

1986-01-01

255

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.

1991-01-01

256

Precision Power Supply Control Module  

Energy Technology Data Exchange (ETDEWEB)

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.

Mora, Bob; Larkin, J.; O' Sullivan, Michael; Dobeck, Nicholas

1991-05-01

257

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1993-10-01

258

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

International Nuclear Information System (INIS)

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

1993-01-01

259

Fast quadrupole pulsed power supply in the AGS  

Energy Technology Data Exchange (ETDEWEB)

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

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

1984-01-01

260

Design considerations of high frequency high voltage ferrite core transformers for 750 kV high voltage generator  

International Nuclear Information System (INIS)

[en] The High voltage generator of 750 keV Industrial Electrons accelerator developed at CAT Indore is a symmetrical series cascaded generator. Choice of a high frequency source for such type of generators becomes essential when high current applications are in demand. Apart from reduction in size and rating of components, a high frequency application has added advantage of low stored energy, less ripple, better regulation and faster response. A high voltage transformer is an important link between the cascaded generator and the high frequency source and it plays a significant role on overall size, cost, performance and efficiency of the system. Accordingly, greater attention is required to be given in design of such transformer. This paper delineates the design considerations pertinent to such types of transformers used in this kind of power supplies

2003-01-01

 
 
 
 
261

Low voltage power supply for HCAL photodetectors in CMS  

CERN Multimedia

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

Kunov, B; Dimitrov, L

2003-01-01

262

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1997-06-01

263

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.

1987-01-01

264

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

265

Development of power supplies at VECC  

International Nuclear Information System (INIS)

[en] Large scale indigenous production of power supplies started at VECC since 1970. At a later stage, compact Superconducting Cyclotron demanded highly stable (of the order of 20 ppm) magnet power supplies to accommodate a large number of highly precise distributed beam trajectory in a smaller radial distance. Intensive quality development around the power supplies became essential. In-depth understanding of the power supply components, modules, computer based simulation, design, instrumentation, wide and long experience, all put together have contributed remarkable results leading to high quality indigenous development of power supply at VECC - a brief report has been presented in this paper. (author)

2005-01-01

266

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.

2003-01-01

267

An innovational application of digital power supply controller on SSRF dynamic power supply  

International Nuclear Information System (INIS)

[en] Control structure of dynamic power supply using PSI controller in SLS and Diamond is introduced. For designing dynamic power supply using PSI controller in the booster of SSRF, an innovative application of PSI digital power supply controller has been developed. In the commissioning of SSRF, the dynamic power supplies performed perfectly. (authors)

2008-01-01

268

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.

2003-01-01

269

Surgical switch mode power supply and surgical DC power tool  

UK PubMed Central (United Kingdom)

In order to improve a surgical DC power tool such that it can be operated, where applicable, under sterile conditions, in particular, using conventional DC voltage supplies, a surgical switch mode power supply for a surgical DC power tool is suggested, comprising a switch mode power supply circuit arrangement, a switch mode power supply housing and a circuit receptacle formed in the housing of the switch mode power supply for accommodating the circuit arrangement of the switch mode power supply, wherein the housing of the switch mode power supply has a switch mode power supply interface which is designed in such a manner that it can be brought into engagement with and/or connected to an interface of the DC power tool provided for a mains-independent energy source. Furthermore, an improved surgical DC power tool is suggested.

KAHLER THOMAS; HOEGERLE ROLAND

270

High voltage variable diameter insulator  

Energy Technology Data Exchange (ETDEWEB)

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

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

1984-01-01

271

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

272

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

273

Alternating polarity power supply control apparatus  

Energy Technology Data Exchange (ETDEWEB)

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

Hendrickson, T.E.

1981-03-17

274

Resonant power supplies for a rapid-cycling accelerator  

Energy Technology Data Exchange (ETDEWEB)

A resonant power supply has been proposed as an efficient power supply for a future 60 GeV, kaon-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 10-kA 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 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.

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

1988-10-01

275

Resonant power supplies for a rapid-cycling accelerator  

International Nuclear Information System (INIS)

A resonant power supply has been proposed as an efficient power supply for a future 60 GeV, kaon-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 10-kA 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 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.

1988-01-01

276

Extra high voltage A.C. transmission engineering  

CERN Multimedia

About the Book: Modern power transmission is utilizing voltages between 345 kV and 1150 kV, A.C. Distances of transmission and bulk powers handled have increased to such an extent that extra high voltages and ultra high voltages (EHV and UHV) are necessary. The problems encountered with such high voltage transmission lines exposed to nature are electrostatic fields near the lines, audible noise, radio interference, corona losses, carrier and TV interference, high voltage gradients, heavy bundled conductors, control of voltages at power frequency using shunt reactors of the switched type which

Begamudre, RD

2006-01-01

277

Airport power supply system. Kukoyo dengen system  

Energy Technology Data Exchange (ETDEWEB)

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

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

1993-06-10

278

Thyratron Marx High Voltage Generator.  

Science.gov (United States)

This invention relates to a high voltage pulse generator of the Marx type, in which capacitors are charged in parallel and discharged in series. Amongst the many techniques for producing high voltage pulses, the Marx generator is probably the best known a...

T. F. Ewanizky

1981-01-01

279

Temperature controlled high voltage regulator  

Energy Technology Data Exchange (ETDEWEB)

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

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

2004-04-20

280

A High Power RF Power Supply for High Energy Physics Applications  

CERN Multimedia

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

 
 
 
 
281

Development of high performance magnet power supply  

International Nuclear Information System (INIS)

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

1998-01-01

282

Bulk water distribution power supply failures  

Scientific Electronic Library Online (English)

Full Text Available 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, such as amongst others, the SAIDI and SAIFI indices as defined by the Institute of Electrical and Electronics Engineering (IEEE). These indices are used to calculate the probabi (more) lity of failure associated with power supply. Data was obtained from a number of sources and used to benchmark the reliability of South African power supply against that of other countries. The reliability of power supply from seven South African Water Board (Rand Water) pump stations is also analysed. Limited data seems to be available that allows one to quantify the reliability of pump systems, taking into account the reliability of the various system components.

Nel, D T; Haarhoff, J

2011-04-01

283

Bulk water distribution power supply failures  

Directory of Open Access Journals (Sweden)

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

D T Nel; J Haarhoff

2011-01-01

284

Shock-activated electrochemical power supplies  

Energy Technology Data Exchange (ETDEWEB)

A shock-activated electrochemical power supply is provided which is initiated extremely rapidly and which has a long shelf life. Electrochemical power supplies of this invention are initiated much faster than conventional thermal batteries. Power supplies of this invention comprise an inactive electrolyte and means for generating a high-pressure shock wave such that the shock wave is propagated through the electrolytes rendering the electrolyte electrochemically active.

Benedick, William B. (Albuquerque, NM); Graham, Robert A. (Los Lunas, NM); Morosin, Bruno (Albuquerque, NM)

1988-01-01

285

Bulk power energy highway for super grids. High-voltage DC transmission at 800 kV; Energieautobahn fuer Super Grids. Hochspannungsgleichstromuebertragung mit 800 kV  

Energy Technology Data Exchange (ETDEWEB)

Developments in power industry will be strongly influenced by the rise in population in many regions of the world: extremely fast growing economics especially in emerging countries like China and India as well as the further increasing power demand in industrialized countries in combination with strong need for climate protection will require bulk power transmission of large amounts of 'green energy' over long distances. Deregulation and liberalization of the electric power markets are posing additional challenges to the transmission systems. System elements are going to be loaded up to their thermal limits, and wide-area power trading with fast varying load patterns will contribute to an increasing congestion. In addition to this, the dramatic global climate developments call for changes in the way electricity is supplied. Environmental constraints, such as loss minimization and CO2 reduction, will play an increasingly important role. Consequently, we have to deal with an area of conflicts between reliability of power supply, environmental sustainability as well as economic efficiency. The power grid of the future must be secure, cost-effective and environmentally compatible. In the paper, solutions and projects with HVDC for Bulk Power transmission are presented and their benefits for Super Grid applications are discussed. (orig.)

Haeusler, Marcus [Siemens AG, Erlangen (Germany); Uecker, Karl [Siemens Energy, Power Transmission Solutions, Erlangen (Germany); Retzmann, Dietmar [Siemens Energy, Power Transmission Solutions, Erlangen (Germany); Univ. Karlsruhe (Germany)

2010-07-01

286

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

International Nuclear Information System (INIS)

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

2005-01-01

287

On-line insulation condition monitoring technique for high voltage apparatus  

Energy Technology Data Exchange (ETDEWEB)

A digital method for computing the loss factor of the insulation of high voltage apparatus was presented. The principle behind this on-line insulation monitoring method is to measure the phase difference between the voltage and current by performing discrete Fourier transform (DFT) on the digitized voltage and current signals rather than detecting zero crossings. Low and high voltage tests were conducted to validate the method. This method can be used to set up a continuous loss factor monitoring system which will maintain the reliability of the power supply. 4 refs., 1 tab., 5 figs.

Zhang, Z.; Raghuveer, M.R. [Manitoba Univ., Winnipeg, MB (Canada). Dept. of Electrical and Computer Engineering

1997-12-31

288

Engineering Design of the ITER AC/DC Power Supply System  

International Nuclear Information System (INIS)

To design high power pulse power supplies, especially in huge power supplies have not designed till now, it is necessary to analyze a system's characteristics and relations with another systems as well as to know high voltage, high current control technologies. Contents of this project are; - Analysis of the changed designs of the AC/DC converters. - Setup of the PSIM model for the calculation of the junction temperature of the converter thyristors. - Finalize the converter's simulation modules and estimate the parallel number of an arm for each converter. - Fix the protection sequence and make a simulation. - Stability check of the power distribution system against the reactive power effect. - Design of small size hardware AC/DC converter. The results of these studies may used as one of references for practical designs of the power supplies and also used for developing Tokamak type fusion reactors in the future

2010-01-01

289

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)

1981-02-04

290

High voltage testing and monitoring  

Energy Technology Data Exchange (ETDEWEB)

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

Feser, K. [Stuttgart Univ. (Germany)

1997-12-31

291

TEXT poloidal coil systems power supplies  

International Nuclear Information System (INIS)

TEXT is a convertional iron core tokamak which will have a toroidal field of 3.0 Tesla produced by room temperature copper coils and a maximum plasma current pulse of 400 kA induced by a 40 turn Ohmic Heating coil. The major radius is 100 cm and the minor radius of the plasma is 28 cm. The machine is intended for basic research in tokamak plasma physics and atomic physics and is designed primarily to provide a stable hot plasma, extremely good diagnostic access, and reliable operation. The discharge pulse length will be 300 msec and the repetition period 120 seconds. Power for the toroidal field coils and for the ohmic heating supply is provided by a 100 MVA energy storage alternator. The vertical field, horizontal field, fast positioning, and discharge cleaning power supply systems are powered from the Tokamak Laboratory power mains. The ohmic heating power system consists of an SCR controlled premagnetizing supply and commutation circuit, the main ohmic heating capacitor bank to provide plasma breakdown and current rise, and an SCR controlled power supply which sustains plasma current during the 300 ms pulse. The vertical field power system uses a small capacitor bank and an SCR controlled supply. The horizontal field has a reversible SCR controlled supply, and the fast positioning coils are powered by bipolar output transistor controlled supplies. This paper describes the loads, required wave forms, and the specifications for these power supply systems

1977-10-25

292

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

293

CONCEPTUAL DESIGN STUDY OF HORN POWER SUPPLY  

International Nuclear Information System (INIS)

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.

2003-01-01

294

Simplified design of switching power supplies  

CERN Multimedia

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

Lenk, John

1996-01-01

295

Power supply system for heat and electricity  

Energy Technology Data Exchange (ETDEWEB)

A power supply system for generating at least one of heat and electricity which includes a number of statically and functionally independent units adapted to generate at least one of heat and electricity which enable a maximum utilization of primary energy. For decentralized power supply over short and low loss supply lines the individual units are constructed as stackable modules. By exchanging or adding one or more modules, it is possible to adapt the flexibility of the power supply system to changes in demand for the energy thereby providing a practical approach to the utilization of waste heat for energy conservation purposes.

Hafner, G.; Finger, H.; Lenz, H.

1985-03-05

296

Quality of Power Supply in European View  

Directory of Open Access Journals (Sweden)

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

Lukas Prokop; Zdenek Hradilek

2008-01-01

297

Neutrino horn power supply operational experience  

Energy Technology Data Exchange (ETDEWEB)

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.

Stillman, P.; Sandberg, J.; Carroll, A.S.; Leonhardt, W.; Monaghan, R.; Pearson, C.; Pendzich, A.; Ryan, G.; Sims, W.P.; Smith, G.A.

1987-01-01

298

Indus -2 dipole magnet power supply  

International Nuclear Information System (INIS)

Sixteen dipole magnets and a reference magnet of Indus-2 are all connected in series and fed by a single power supply. Power rating of the supply is approx. 600 kw, thus thyristor converter is the most suitable option. Stringent stability specifications of 50 ppm including ripple are met by using a series pass element in a peculiar configuration

2003-01-01

299

Power supply to a modern refinery  

Energy Technology Data Exchange (ETDEWEB)

The electric power supply system in a refinery was extended because of a considerable increase in turnover. The power supply system in a refinery must have an extremely high degree of availability, reliability and safety. BBC met these stringent requirements with suitable subdistribution systems, automatic, selectively graded switchgear and other items of equipment.

Scheuber, W.

1980-01-01

300

A new technique for independent control of high voltage surfaces in a multi-GEM stack  

Energy Technology Data Exchange (ETDEWEB)

Traditionally, gas electron multipliers (GEMs) have been powered by a resistor divider chain to protect the elements against accidental power supply failure. We present a new, low cost method for individually biasing the GEMs in a multi-GEM stack. The use of isolated DC to DC Converters (DCCs) allows for independent control and monitoring of all GEM high-voltage surfaces without compromising the safety of the GEMs.

Fransham, K; Hasanen, R; Karlen, D [Department of Physics and Astronomy and TRIUMF, University of Victoria, P.O. Box 3055 STN CSC Victoria, V8W 3P6 B.C. (Canada)

2006-11-15

 
 
 
 
301

A new technique for independent control of high voltage surfaces in a multi-GEM stack  

International Nuclear Information System (INIS)

Traditionally, gas electron multipliers (GEMs) have been powered by a resistor divider chain to protect the elements against accidental power supply failure. We present a new, low cost method for individually biasing the GEMs in a multi-GEM stack. The use of isolated DC to DC Converters (DCCs) allows for independent control and monitoring of all GEM high-voltage surfaces without compromising the safety of the GEMs.

2006-01-01

302

Compact Digital High Voltage Charger  

CERN Document Server

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

Li, Ge

2005-01-01

303

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1993-01-19

304

Upgrading of high voltage power transmission lines. Cost benefit analysis supports investment decisions; Opwaardering hoogspanningslijnen. Kosten-batenanalyse helpt bij investeringsbeslissingen  

Energy Technology Data Exchange (ETDEWEB)

A variety of technologies is available to increase the capacity of high voltage lines. Although a qualitative motivation in the selection process may be useful to engineers, management is often more interested in a quantitative cost-benefit analysis. An analysis of capacity extension of the 150 kV link Dodewaard-Veenendaal demonstrates that minor technical details are decisive in the result.

Ross, A.A.H.J.; Janssen, M. [Petersburg consultants, Andelst (Netherlands); Vrielink, A.H.; Koers, F.M. [REMU Transportnetten, Utrecht (Netherlands)

2000-12-01

305

High Frequency Power Supply for Electrostatic Precipitators in Thermal Power Plants  

Directory of Open Access Journals (Sweden)

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

Slobodan Vukosavi?

2011-01-01

306

Improvement of Heat Power Supply Module  

Energy Technology Data Exchange (ETDEWEB)

A module which provides power to Heat Junction Thermocouple(HJTC) is called Hear Power Supply Module(HPSM). The main roles of HJTC are as below. 1. Measuring reactor coolant level (providing loss of coolant information) 2. Measuring temperature in reactor head area (Calculating subcooled margin in reactor head area) HPSM supplies power to such HJTC and it is equipped in a QIAS-P Cabinet

Lee, Hyung Soo; Park, Jung Jin; Kim, Dae Jae; Kim, Deok In [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

2010-05-15

307

An accurate continuous calibration system for high voltage current transformer.  

Science.gov (United States)

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

Tong, Yue; Li, Bin Hong

2011-02-01

308

Single Stage Switching Power Supply With Half  

Directory of Open Access Journals (Sweden)

Full Text Available Single stage switching power supply with half bridgetopology simulation for LED lamp Driver is presented in thispaper.LED lamp driver needs only dc supply. In this paper dcsupply is obtained as output while giving ac input voltage of 110V.It is formed by combination of ac/dc converter and dc/dc postregulator. Compared to other switching power supply this reducescost ,size and simplifies circuit design. It increases efficiency andoutput voltage can be controlled. The simulation of single stageswitching power supply using half bridge topology using Psimsoftware is done and output voltage and power are verified .byusing this get an output voltage of 48 V dc output and power rangeup to 120 W ,and efficiency is above .89 . It is used in LED lampdrivers and piezoelectric element drivers.

Prijith.M; M.S.P.Subathra

2012-01-01

309

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

International Nuclear Information System (INIS)

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

1976-01-01

310

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

1980-01-01

311

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; M. N.M. Isa; N. A. Rahman

2007-01-01

312

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

International Nuclear Information System (INIS)

[en] 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)

1996-01-16

313

Active Rectifier for Uninterruptable Power Supply  

Science.gov (United States)

The paper contains analysis of power factor correction circuits that is made in the context of elaboration of uninterruptable power supply system. Various correctors have been estimated analytically, by means of simulation and experimentally. The most significant attention has been paid to the efficiency of the analyzed converters and their compatibility with modular approach to development of power converters.

Stepanov, Andrew; Bogdans, Valdis; Suskis, Pavel; Galkin, Ilya

2010-01-01

314

Nuclear power: energy security and supply assurances  

Energy Technology Data Exchange (ETDEWEB)

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.)

Rogner, H.H. [International Atomic Energy Agency (IAEA), Vienna (Austria). Planning and Economic Studies Section; McDonald, A. [International Atomic Energy Agency (IAEA), Vienna (Austria). Dept. of Nuclear Energy

2008-02-15

315

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

316

Control units for APS power supplies  

Energy Technology Data Exchange (ETDEWEB)

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

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

1993-07-01

317

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.

1993-01-01

318

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), and the storage ring (SR). Each subsystem has multiple magnet and power supply combinations, some requiring multiple modes of operation. These magnet and power supply combinations are computer controlled and monitored. The power supply control unit (PSCU) is the first layer of hardware and software directly above the power supply itself and is described in this paper. The description includes the basic philosophy for each mode of operation and how it influences the topology and means of implementing control. The design of the analog reference blocks (ARBs) influenced the design of other custom functions as well as the feedback controls for vibration and other dynamic correction. The command set supported by the PSCU is discussed

1993-01-01

319

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1987-12-31

320

Correction magnet power supplies for APS machine  

Energy Technology Data Exchange (ETDEWEB)

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.

Kang, Y.G.

1991-01-01

 
 
 
 
321

A high voltage test stand for electron gun qualification for LINACs  

Energy Technology Data Exchange (ETDEWEB)

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

Wanmode, Yashwant D.; Mulchandani, J.; Acharya, M.; Bhisikar, A.; Singh, H.G.; Shrivastava, Purushottam, E-mail: yash@rrcat.gov.in [Pulsed High Power Microwave Section, Raja Ramanna Centre for Advanced Technology, Indore (India)

2011-07-01

322

PEP magnet power supply systems  

International Nuclear Information System (INIS)

[en] 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

1977-01-01

323

Power supply circuit for vehicle  

Energy Technology Data Exchange (ETDEWEB)

A circuit is described for a motorized vehicle having an ignition switch connected to a power source, such as a battery. The circuit controls the application of power from the power source to an electric device, such as a motor for driving an electric window or sun roof. It comprises: a relay having relay contacts and a driving coil, the relay contacts being connected between the power source and the electric device so as to apply power to the device upon energization of the driving coil; door switch means coupled to the power source for detecting opening of a door of the vehicle; and control means coupled to the ignition switch, to the door switch means and to the driving coil, for continuously energizing the driving coil in direct response to power being applied from the power source by the ignition switch and for de-energizing the driving coil in response to the door switch means detecting opening of a door of the vehicle.

Takeda, N.; Hattori, M.

1987-03-10

324

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.

1989-01-01

325

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.

1989-01-01

326

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)

2007-01-01

327

Spark-proof power supply source  

Energy Technology Data Exchange (ETDEWEB)

The power supply source is used for remote power supply of telemechanic equipment, which is used in a blastproof environment, for example in underground workings of coal mines wjhich have dangerous concentrations of gas and dust. It contains a power transformer, rectifier, stabilizer, measurement inductor, modulation transformer, LC-filter and thyristor assembly for limiting the power of switching charges. It includes a thyristor for angle of lead disconnection. It also has a circuit for isolating thyristor control signals. In order to improve the output capacity the LC-filter is connected between the control eletrodes of the thyristor and the output of the signal separation circuit for controlling the thyristor.

Neyman, V.B.; Chumakov, Yu.N.; Demchenko, N.P.

1980-04-08

328

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

International Nuclear Information System (INIS)

[en] 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)

1976-01-01

329

New intelligent magnet power supplies for LAMPF  

International Nuclear Information System (INIS)

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

1991-01-01

330

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

Energy Technology Data Exchange (ETDEWEB)

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

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

1995-01-01

331

SNS EXTRACTION KICKER POWER SUPPLY PROTOTYPE TEST  

Energy Technology Data Exchange (ETDEWEB)

The SNS (Spallation Neutron Source) accumulator ring Extraction System consists of a Fast kicker and a Lambertson Septum magnet. The proposed design will use 14 kicker magnets powered by an Extraction Kicker Power Supply System. They will eject the high power beam from the SNS accumulator ring into RTBT (Ring to Target Beam Tunnel) through a Lambertson Septum magnet. This paper describes some test results of the SNS Extraction Kicker power supply prototype. The high repetition rate of 60 pulse per second operation is the challenging part of the design. In the prototype testing, a 3 kA damp current of 700ns pulse-width, 200 nS rise time and 60 Hz repetition rate at 32 kV PFN operation voltage has been demonstrated. An Extraction kicker power supply system design diagram is depicted.

MI,J.L.; SANDBERG,J.; SANDERS,R.; SOUKAS,A.; ZHANG,W.

2000-06-27

332

SNS EXTRACTION KICKER POWER SUPPLY PROTOTYPE TEST  

International Nuclear Information System (INIS)

The SNS (Spallation Neutron Source) accumulator ring Extraction System consists of a Fast kicker and a Lambertson Septum magnet. The proposed design will use 14 kicker magnets powered by an Extraction Kicker Power Supply System. They will eject the high power beam from the SNS accumulator ring into RTBT (Ring to Target Beam Tunnel) through a Lambertson Septum magnet. This paper describes some test results of the SNS Extraction Kicker power supply prototype. The high repetition rate of 60 pulse per second operation is the challenging part of the design. In the prototype testing, a 3 kA damp current of 700ns pulse-width, 200 nS rise time and 60 Hz repetition rate at 32 kV PFN operation voltage has been demonstrated. An Extraction kicker power supply system design diagram is depicted.

2000-01-01

333

High Reliability Uninterruptible Power Supply  

Directory of Open Access Journals (Sweden)

Full Text Available Reducing the number of switches andpassive elements in uninterruptible power supplytopologies not only reduces the cost of the wholesystem but also provides some other advantages suchas greater compactness, smaller weight, and higherreliability. Generally, the largest cost reduction isachieved by reducing the number of switches employedin a converter power circuit. Diodes are less expensivethan active switches and apart from this, there is also acost reduction from eliminating all the circuitry fordriving active switches.

ALBU R?zvan-Daniel; ?EPELEA Laviniu; POPEN?IU-VL?DICESCU Florin

2010-01-01

334

ISABELLE magnet power supply system performance analysis  

Energy Technology Data Exchange (ETDEWEB)

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

Edwards, R.J.

1981-01-01

335

ISABELLE magnet power supply system performance analysis  

International Nuclear Information System (INIS)

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

1981-03-13

336

HIGH VOLTAGE CIRCUIT FOR ELECTRICAL STIMULATION  

UK PubMed Central (United Kingdom)

The present invention relates to a remote-receiving circuit (1) for providing and controlling an electric stimulus applied to an animal, the circuit (1) comprising: an isolated DC/DC converter (4) having a low voltage input powered by an energy source (3) and a high voltage output connected to a storage capacitor (8) suitable to be charged with stimulus energy by said converter (4) a first electrode (5) and a second electrode (6) configured to be in contact with the animal for delivering to it high voltage stimulus current and connected to the respective ends of said storage capacitor (8) a current-limiting circuit (9) connected in series with the storage capacitor (8) to control the stimulus current delivered to the animal through the electrodes (5, 6).

FREBEL FABRICE; MANGUETTE BERNARD

337

HIGH VOLTAGE CIRCUIT FOR ELECTRICAL STIMULATION  

UK PubMed Central (United Kingdom)

The present invention relates to a remote--receiving circuit (1) for providing and controlling an electric stimulus applied to an animal, the circuit (1) comprising : - an isolated DC/DC converter (4) having a low voltage input powered by an energy source (3) and a high voltage output connected to a storage capacitor (8) suitable to be charged with stimulus energy by said converter (4) - a first electrode (5) and a second electrode (6) configured to be in contact with the animal for delivering to it high voltage stimulus current and connected to the respective ends of said storage capacitor (8) - a current-limiting circuit (9) connected in series with the storage capacitor (8) to control the stimulus current delivered to the animal through the electrodes (5, 6).

FREBEL FABRICE; MANGUETTE BERNARD

338

High voltage circuit for electrical stimulation  

UK PubMed Central (United Kingdom)

The present invention relates to a remote-receiving circuit (1) for providing and controlling an electric stimulus applied to an animal, the circuit (1) comprising : - an isolated DC/DC converter (4) having a low voltage input powered by an energy source (3) and a high voltage output connected to a storage capacitor (8) suitable to be charged with stimulus energy by said converter (4) - a first electrode (5) and a second electrode (6) configured to be in contact with the animal for delivering to it high voltage stimulus current and connected to the respective ends of said storage capacitor (8) - a current-limiting circuit (9) connected in series with the storage capacitor (8) to control the stimulus current delivered to the animal through the electrodes (5, 6).

FREBEL FABRICE; MANGUETTE BERNARD

339

Positron Accumulator Ring (PAR) power supply  

Energy Technology Data Exchange (ETDEWEB)

The Positron Accumulator Ring (PAR) consists of 8 dipole magnets connected in series. These magnets are energized via one 12-pulse dc power supply. The power supply consists of four phase controlled half-wave wye group converters. Each of the two half-wave converters are connected through an interphase transformer to obtain a full-wave converter with 120{degrees} conduction. The input voltage for these two half-wave converters are 180{degrees} apart. The two full-wave converters are connected in parallel through a third interphase transformer. This type of connection of the converters not only provides the required output current, it also improves the input power factor of the power supply. The output of the wye group converters is filtered through a passive L-R-C filter to reduce the ripple content of the output current. At low current values of the power supply the current ripple is high, thus a large filter is needed, which adds to the cost of the power supply, however at high output current levels, the current ripple is less severe. The large size of the filter can be reduced by adding an anti-parallel rectifier diode(D1) to the output of the power supply. A freewheeling diode(D2) is connected before the choke to circulate the current once the power supply is turned off. In order to measure the current in the magnet a high precision, low drift, zero flux current transductor is used. This transductor senses the magnet current which provides a feedback signal to control the gating of the converter`s thyristors. A true 14 bit Digital to Analog Converter (DAC) is programmed by the control computer for the required current value, providing a reference for the current regulator. Fast correction of the line transients is provided by a relatively fast voltage loop controlled by a high gain slow response current loop.

Fathizadeh, M.

1995-08-01

340

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

 
 
 
 
341

Safeguarding power supply by European compound  

Energy Technology Data Exchange (ETDEWEB)

From the North Cape to Sicily and from Brittany to the Iron Curtain there is a large interconnected supergrid. Is it really necessary to have such a giant network with poles and steel-aluminium lines. Wouldn't it be better to have individual power units for every major city or region for local power supply.

Busch, H.G.

1983-05-20

342

CMS uniform low voltage power supply system  

CERN Multimedia

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

Vankov, I

2003-01-01

343

Basic technology of synchrotron power supply  

International Nuclear Information System (INIS)

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

1995-01-01

344

Conceptual design and circuit analyses for the power supplies of the NIO1 experiment  

International Nuclear Information System (INIS)

The NIO1 (Negative Ion Optimization phase 1) experiment, whose construction has started in 2010 at Consorzio RFX in Padova in collaboration with INFN-LNL, is a radio frequency Hydrogen negative ion source designed to produce a beam current of 130 mA with 60 keV particle energy. The aim of the experiment is to provide a highly flexible system to test material properties of source components and to benchmark simulation codes for beam optics and plasma behavior. The paper focuses on a conceptual design for NIO1 power supply system on the basis of given operational and performance requirements. The requested ratings fall well within those of products available on the market and the design includes standard commercial solutions for the individual power supplies. The ion source operates at -60 kV with respect to ground, leading to a number of design issues at system level and related to mutual connection between power supplies and load, layout and grounding. These aspects, along with the crucial point of ensuring protection to the arc prone beam source, are reviewed and discussed. The study leads to a scheme integrating high voltage power supplies, high current power supplies and a possible solution for passive protection components at the power supply output.

2010-10-01

345

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.

2009-10-15

346

The APS Septum Magnet Power Supplies Upgrade  

CERN Document Server

The higher requirements for beam injection stability at the APS storage ring demand improvement of pulsed power supplies for the septum magnets. The upgrade will be performed in two stages. In the first stage we will implement a new power supply circuit with a new regulation timing sequence that will provide better voltage regulation performance. A common design was made for all of the septum magnet power supplies at the APS. The new regulation module has already been tested on both thin and thick septum magnet power supplies. This test showed that the new target for the current regulation stability, 1/2000 with less than 10-ns jitter, is achievable with this approach. In the second stage we will implement an embedded microprocessor system that will provide digitally controlled shot-to-shot current regulation of the power supply. The system comprises modules for communication with EPICS, data acquisition, and precise timing. A prototype has already been built and will also be discussed.

Deriy, Boris; Sprau, Gary; Wang, Ju

2005-01-01

347

Small-sized high-voltage pulse generator  

International Nuclear Information System (INIS)

A high-voltage pulse shaper on the basis of pulse transformer with a complete discharge of the storage has been described. The small-sized high-voltage pulse generator is designed for power supply of accelerator injectors, vacuum diodes, X-ray ntubes, etc. The amplitude of voltage pulse of semisinusoidal form with the loading of 20 kOhm constitutes 500 kV; pulse duration over the base constitutes 0.7 ?s. The pulse repetitation rate is 50 Hz. The pulse transformer dimensions are 190x200x155 mm, the mass is 27 kg. Three K15-10 capacitors (40 kV, 0.01 ?F) switched in parallel serve as capacity storage of the primary circuit of the pulse transformer. The capacitors are charged from the charging device and are commutated to the primary winding of the transformer by means of a thyratron. The secondary winding is loaded by the active resistance of 20 kOhm.

1984-01-01

348

Photovoltaic power supplies: Energy option feasibility  

International Nuclear Information System (INIS)

Commercialization prospects for grid connected, stand-alone and hydrogen- production photovoltaic power plants are assessed. The paper traces the evolution of the development of photovoltaic modules and correlates trends in R ampersand D expenditure and progress made with subsequent drops in the cost of photovoltaic power equipment. Assessments are made of limits in the marketability of grid connected photovoltaic power supplies and comments are made as to the wisdom of the current directions being taken by research groups operating in this field

1993-01-01

349

The JET power supply comprehensive system  

International Nuclear Information System (INIS)

The Joint European Torus (JET) Power Supply pulses system has to provide power and energy to four main loads; toroidal field coils (up to 380MW, 5500MJ), poloidal field coils (up to 300MW, 1200MJ), poloidal field control amplifiers (+50, -30MW, 500MJ), additional heating (>=25MW, 250MJ). The power supply scheme designed as a result of a compromise between JET requirements, site H.V. line characteristics and equipment manufacturing experience in industry, consists of a combination of constant frequency units (transformers + controlled convertor (TCC)), directly supplied by the mains at 400kV during the pulse and variable frequency units (flywheel generator convertor (FGC)), isolated from the electric system during the pulse

1976-06-18

350

Power supply switching device and method thereof, power supply system and medical device  

UK PubMed Central (United Kingdom)

The invention discloses a power supply switching device and a method thereof, a power supply system and a medical device. The power supply switching device is used for switching a power supply output terminal of the power supply system to an AC/DC adapter from a battery. The device comprises a switch unit and a first battery fault detection unit, wherein the switch unit is used for being coupled between the AC/DC adapter and the power supply output terminal the input end of the first battery fault detection unit is used for being coupled to a first battery, and the output end thereof is coupled to the switch unit and the first battery fault detection unit is used for detecting whether the first battery breaks down and controls the switch unit to be conducted when the first battery breaks down. The invention can switch back the AC/DC adapter to supply power when the first battery breaks down, realize the seamless switching between the first battery and the AC/DC adapter, and improve the work efficiency and the reliability of a power supply.

GUANG LI; WAN ZHANG

351

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)

1991-01-01

352

Power supplies for hearing aids.  

UK PubMed Central (United Kingdom)

The design of a hearing-aid system involves three disciplines of applied science--electrochemistry, electrical engineering and audio engineering. This paper is concerned with the interface between the first two. Batteries are essentially non-linear components. Optimum performance is only achievable when the electrical requirements of the hearing aid are closely matched with the voltage, rate capability and impedance of the battery. After years of optimalization, the modern '675' button cell has earned universal acceptability and is now used in most 'behind-the-ear' hearing aids. When more power is required, the larger and less specialized LR6 'penlight' cell is typically specified. Higher voltage might lead to better circuit efficiency, and there is some pressure to introduce a 3 V lithium-based product. Lithium should give superior energy density, but there are problems which remain to be solved. In the end, it is quite possible that the market might settle for an ecologically acceptable long-life lower voltage metal-air cell. If so, the recent zinc-air system may well have a future and could conceivably succeed both the mercury '675' and the alkaline 'penlight' cells.

Knutsen JE

1982-08-01

353

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

International Nuclear Information System (INIS)

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

1998-01-01

354

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

Energy Technology Data Exchange (ETDEWEB)

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

Zhang Yunxiang [NSRL, USTC, Hefei, AH (China)

1998-11-01

355

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

Directory of Open Access Journals (Sweden)

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

Valkov Ivan Stoyanov

2011-01-01

356

Wireless Power Transmission for Power Supply: State of Art  

Directory of Open Access Journals (Sweden)

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

J. Kracek; M. Mazanek

2011-01-01

357

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)

2009-01-01

358

Lawrence Berkeley Laboratory power supply system for neutral beam source development  

International Nuclear Information System (INIS)

[en] 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

1977-10-29

359

High-voltage air-core pulse transformers  

Energy Technology Data Exchange (ETDEWEB)

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

Rohwein, G.J.

1981-08-01

360

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

International Nuclear Information System (INIS)

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

1983-01-01

 
 
 
 
361

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

Energy Technology Data Exchange (ETDEWEB)

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.

Kunze, R.C.; Lohnert, H.

1981-01-01

362

A novel High-Voltage System for a triple GEM detector  

CERN Document Server

A novel High-Voltage System for a triple GEM detector has been designed and realized in Frascati within the LHCb muon detector framework. The system is built with seven floating power supply, with a maximum of 1200 V each, and controlled via CANbus, for voltage settings and monitoring. Several HV modules can be installed in a nano-ammeter mainframe already developed in Frascati, realizing a HV crate able to supply up to 24 triple GEM chambers with a 1 nA resolution monitoring system.

Corradi, Giovanni; Tagnani, Diego; 10.1016/j.nima.2006.10.166

2007-01-01

363

Power supply without the nuclear energy source?  

International Nuclear Information System (INIS)

On the occasion of the public hearing of experts on November 4, 1988 in the Land Parliament of North-Rhine Westphalia, the VIK made a statement given in this article, on the expert opinion presented by Prognos AG, entitled: 'Economically efficient energy utilisation and power generation without the nuclear energy source: Potentials and impacts in terms of energy supplies, ecology, and economy'. (orig.)

1988-10-26

364

Protection of the MFTF accel power supplies  

International Nuclear Information System (INIS)

The MFTF experiment's Sustaining Neutral Beam Power Supply System (SNBPSS) includes twenty-four 95 kV, 80 A accel dc power supplies (ADCPS). Each power supply includes a relatively high-impedance (20 percent) rectifier transformer and a step voltage regulator with a 50-100 percent voltage range. With this combination, the fault current for some postulated faults may be lower than the supply's full load current at maximum voltage. A design has been developed which uses protective relays and current-limiting fuses coordinated to detect phase and ground faults, DC faults, incorrect voltage conditions, rectifier faults, power factor correction capacitor faults, and overloads. This unusual solution ensures fast tripping on potentially destructive high-current faults and long-time delays at lower currents to allow 30 second pulse operation. The ADCPS meets the LLL specification that all major assemblies be self-protecting, that is, able to sustain external faults without damage to minimize damage due to internal faults

1979-11-16

365

Pulsed power supplies based on inductive stores  

International Nuclear Information System (INIS)

[en] At the D.V. Efremov Scientific Research Institute for Electrophysical Apparatus research and development is being carried out on resistive, cryoresistive and superconducting inductive energy stores, high-speed switching apparatus, energy extraction systems and complex power supplies based on inductive stores for experimental fusion facilities. (UK)

1978-01-01

366

Pulsed power supply for Nova Upgrade  

International Nuclear Information System (INIS)

[en] 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

1992-01-01

367

Pulsed power supply for Nova Upgrade  

Science.gov (United States)

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

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

368

PSC/PSI power supply control prototype based on RTEMS  

International Nuclear Information System (INIS)

A PSC/PSI power supply control prototype was developed by using an open-source real-time operating system RTEMS and PSC/PSI power supply controller developed by BNL. The structure of the prototype, development procedures as well as testing result with a power supply of a corrector magnet were described. It can switch on/off the power supply, ramp up/down the current, and monitor the real-time states of the power supply. (authors)

2010-01-01

369

High-voltage pulse generator for wire spark chambers  

International Nuclear Information System (INIS)

A high-voltage-pulse generator with a cermet hydrogen thyratron as a commutating element is described. The high-voltage-pulse generator is the main element of the supply system of spark wire chambers. To reduce the delay time of the formed pulse a positive bias is fed to the thyratron grid. The dependence of the thyratron time delay on the positive grid bias is given. The problem is considered of stabilization of the supply voltage at the thyratron anode when operating on a capacitance load. The high-voltage-pulse generator forms negative-polarity pulses with a front of 30 ns, 170 ns duration, and a time delay of 100 ns relative to the triggering signal

1976-01-01

370

RHIC INSERTION REGION, SHUNT POWER SUPPLY CURRENT ERRORS  

International Nuclear Information System (INIS)

[en] The Relativistic Heavy Ion Collider (RHIC) was commissioned in 1999 and 2000. RHIC requires power supplies to supply currents to highly inductive superconducting magnets. The RHIC Insertion Region contain's many shunt power supplies to trim the current of different magnet elements in a large superconducting magnet circuit. Power Supply current error measurements were performed during the commissioning of RHIC. Models of these power supply systems were produced to predict and improve these power supply current errors using the circuit analysis program MicroCap V by Spectrum Software (TM). Results of the power supply current errors are presented from the models and from the measurements performed during the commissioning of RHIC

2001-01-01

371

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

Science.gov (United States)

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

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

2013-06-01

372

Magnet power supply as a network object  

Energy Technology Data Exchange (ETDEWEB)

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.

Cohen, S.; Stuewe, R.

1991-01-01

373

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

1991-01-01

374

Power supply system for remote site application  

Energy Technology Data Exchange (ETDEWEB)

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

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

2007-07-01

375

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.

Shim Eun-yong; Ahn Il-kun; Seo Tae-won; Lee Seung-kyo; Bae Young-soon; Joung Jin-Hyun; Joung Mi

2012-01-01

376

NSTX power supply real time controller  

Energy Technology Data Exchange (ETDEWEB)

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).

Neumeyer, C.; Hatcher, R.; Marsala, R.; Ramakrishnan, S.

2000-01-06

377

Wind power in integrated power supply; Windkraft im Energieverbund  

Energy Technology Data Exchange (ETDEWEB)

Enercon is testing wind power as part of an integrated power supply concept in a village near Hanover. [German] Enercon erprobt die Windenergie als Teil einer integrierten Energieversorgung. Die Auricher Firma hat die Verantwortung fuer die gesamte Versorgungs- und Entsorgungstechnik eines modernen Dorfes in der Naehe von Hannover uebernommen. (orig.)

Kluttig, H.

2001-03-01

378

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

379

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)

2000-01-01

380

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

Energy Technology Data Exchange (ETDEWEB)

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 SF/sub 6/ 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.

Scalise, D.T.; Fong, E.; Haughian, J.; Prechter, R.

1986-10-01

 
 
 
 
381

High-voltage air-core pulse transformers  

Energy Technology Data Exchange (ETDEWEB)

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

Rohwein, G. J.

1981-01-01

382

High voltage load resistor array  

Energy Technology Data Exchange (ETDEWEB)

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

383

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 linked, as is reflected in the format of this paper. (author)

2001-01-01

384

TPI synchrotron electromagnet power supply system  

International Nuclear Information System (INIS)

The modernized power supply circuit of the TP4 synchrotron electromagnet is described. The power supply system consists of a charging facility (CF), which contains a buffer capacitance storage ring and a circuit of oscillatory charging of the main storage ring. The cycle repetition frequency increases up to 7 Hz at the 1000 MeV beam energy, and when the storage capacitors are turned off eit increases up to 12 Hz at the energy up to 600 MeV. The magnetic field stability is maintained by a multicircuit automatic control system (ACS). The field amplitude ACS is designed for compensating slowly changing destabilizing factors. The ACS maintains nonuniformity of the magnetic field flat top at the minimum level with the 7x10-4 accuracy the total error of the stabilizing circuit measured at the 0.5T level during 24 h is close to 10-3.

1980-10-16

385

Performance of a 2-megawatt high voltage test load  

International Nuclear Information System (INIS)

[en] 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

1995-01-01

386

Process computers automate CERN power supply installations  

CERN Multimedia

Computerized automation systems are being used at CERN, Geneva, to improve the capacity, operational reliability and flexibility of the power supply installations for main ring magnets in the experimental zones of particle accelerators. A detailed account of the technological problem involved is followed in the article by a description of the system configuration, the program system and field experience already gathered in similar schemes. (1 refs).

Ullrich, H

1974-01-01

387

Power supplies for the injector synchrotron quadrupoles and sextupoles  

Energy Technology Data Exchange (ETDEWEB)

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

Fathizadeh, M.

1995-07-01

388

Design and research of CSR dipole pulsed thyristor power supply  

International Nuclear Information System (INIS)

[en] The pulsed power supply is very important for HIRFL-CSR power supply system. All power supplies in CSRm and CSRe need pulsed operation mode. These power supplies must have high current stability, low current ripple and good dynamic characteristic. A small-scale thyristor rectifier prototype has been researched and designed to find and solve all technique problems of pulsed power supply. The parameters of prototype are the same or higher than dipole power supplies in CSRm and CSRe. The tested results are satisfied

2002-01-01

389

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)

2012-01-01

390

Power Supply Systems for Rapid Cycling Synchrotron  

Science.gov (United States)

JAEA and KEK are jointly constructing a high intensity proton accelerator project J-PARC. Its main accelerator is 3GeV rapid cycling synchrotron (RCS). Two types of resonant excitation systems, parallel and cascade, are introduced to excite DC biased 25Hz AC currents through its main magnets. The parallel excitation is adopted for dipole magnets power supply system, and the cascade excitations are adopted for seven family quadrupole magnets systems. In this paper, two systems are investigated and analyzed, and it is explained why different types are adopted to each system. Authors believe that such hybrid exciting systems are most suitable for high power RCS.

Watanabe, Yasuhiro; Adachi, Toshikazu; Someya, Hirohiko; Koseki, Shoichiro; Ogawa, Shinichi

391

Thermal power in the Swedish energy supply  

International Nuclear Information System (INIS)

A survey is presented of the part played by thermal power plants including nuclear plants in the Swedish electric power supply system. The Swedish and Norwegian situations are compared. The background for the present structure is outlined and the optimisation of electricity production is briefly discussed. The Nordic grid is presented and the strategy and charges discussed. The prognosis for the development in Sweden is presented with a brief discussion of the influence of industrial development. Finally the responsibility of the politicians for the continued development is discussed. (JIW)

1977-11-01

392

Process computers automate CERN power supply installations  

International Nuclear Information System (INIS)

Higher standards of performance and reliability in the power plants of large particle accelerators necessitate increasing use of automation. The CERN (European Nuclear Research Centre) in Geneva started to employ process computers for plant automation at an early stage in its history. The great complexity and extent of the plants for high-energy physics first led to the setting-up of decentralized automatic systems which are now being increasingly combined into one interconnected automation system. One of these automatic systems controls and monitors the extensive power supply installations for the main ring magnets in the experimental zones. (orig.)

1974-01-01

393

Precision, 32 channel power supply system  

International Nuclear Information System (INIS)

A modular, multichannel current regulator system has been developed to power the low current correction and focusing magnets used for beam transport. The basic module consists of a relay rack housing four card crates with eight regulators per crate. The rack also contains a utility chassis and common power supplies. Each regulator card includes a communications microprocessor and a temperature controlled analog circuit block containing precision reference, serial DAC, shunt resistor and error amplifier. The regulators are linear, bipolar units capable of furnishing up to 10 amps at 20 volts with less than 0.01% ripple and drift.

1991-01-01

394

Precision, 32 Channel Power Supply System  

Energy Technology Data Exchange (ETDEWEB)

A modular, multichannel current regulator system has been developed to power the low current correction and focusing magnets used for beam transport. The basic module consists of a relay rack housing four card crates with eight regulators per crate. The rack also contains a utility chassis and common power supplies. Each regulator card includes a communications microprocessor and a temperature controlled analog circuit block containing precision reference, serial DAC, shunt resistor and error amplifier. The regulators are linear, bipolar units capable of furnishing up to 10 amps at 20 volts with less than 0.01% ripple and drift.

Boettcher, E.; La Mora, B.; O' Sullivan, Michael; Dobeck, Nicholas; Francis, Peter; Beaufait, Joseph; Sharp, Craig; Burtner, George

1990-09-01

395

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

396

Balance sheet of German power supply 1985  

Energy Technology Data Exchange (ETDEWEB)

1985 power consumption from the public network rose by 3.4% to a total of 345.7 TWh. The growth rate was at 2.8% in total power economy (public supply, industry, Federal German Railways): primary energy consumption rose by 3.2%, GNP by 2.5% in real terms. The linking factor between economic growth and increase of energy/power consumption has diminished. Major factors of influence (partly countercurrent ones) for this development consist in the extreme frosts at the beginning of this year, in the continuous recovery of economy and in the 1984 strike of the metal workers. Cautions forecast for this year: GNP +3%, total power consumption +2.5%.

Schnug, A.

1986-04-01

397

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 increasing. Under the circumstances Showa Electric Wire and Cable Co. has developed an ''inverted-T type plug-in connector'' which is quite easy to work with in making cable connections, is small in size, and is easy to remove and re-install in the inspection and maintenance of high-voltage motors, and it has been demonstrated in electrical, mechanical and other tests that this connector complies with the requirements. (author)

1978-01-01

398

Correction magnet power supplies for APS machine  

Energy Technology Data Exchange (ETDEWEB)

A number of correction magnets are required for the advanced photon source (APS) machine to correct the beam. There are five kinds of correction magnets for the storage ring, two for the injector synchrotron, and two for the positron accumulator ring (PAR). Table I shoes a summary of the correction magnet power supplies for the APS machine. For the storage ring, the displacement of the quadrupole magnets due to the low frequency vibration below 25 Hz has the most significant effect on the stability of the positron closed orbit. The primary external source of the low frequency vibration is the ground motion of approximately 20 {mu}m amplitude, with frequency components concentrated below 10 Hz. These low frequency vibrations can be corrected by using the correction magnets, whose field strengths are controlled individually through the feedback loop comprising the beam position monitoring system. The correction field require could be either positive or negative. Thus for all the correction magnets, bipolar power supplies (BPSs) are required to produce both polarities of correction fields. Three different types of BPS are used for all the correction magnets. Type I BPSs cover all the correction magnets for the storage ring, except for the trim dipoles. The maximum output current of the Type I BPS is 140 Adc. A Type II BPS powers a trim dipole, and its maximum output current is 60 Adc. The injector synchrotron and PAR correction magnets are powered form Type III BPSs, whose maximum output current is 25 Adc.

Kang, Y.G.

1991-04-01

399

SPEAR3 INTERMEDIATE DC MAGNET POWER SUPPLIES  

Energy Technology Data Exchange (ETDEWEB)

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 intermediate power supplies (IPS) that consist of tightly-regulated (better than {+-}10ppm) current sources ranging from 60 A to 500 A and output powers ranging from 2.4kW to 22.5kW. A total of 69 IPS are in successful operation. The SPEAR 3 upgrade performance and reliability requirements mandated new power supplies for both the SPEAR3 storage ring, and for the booster-to-SPEAR3 transport line. IPS are widely used at SPEAR3 to power single quadrupoles, dipoles, families of quadrupoles and sextupoles, and also Titanium sublimation pumps. IPS topology allows them to be series operated for those magnet strings requiring higher voltages. A compact 19 inch standard rack-mounted design is common to all the units. These are off-line, switch-mode, operating at 16 kHz to reduce space and provide for fast output response and high efficiency.

de Lira, A

2004-06-23

400

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

International Nuclear Information System (INIS)

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

2009-08-04

 
 
 
 
401

Design of a -1 MV dc UHV power supply for ITER NBI  

International Nuclear Information System (INIS)

Procurement of a dc -1 MV power supply system for the ITER neutral beam injector (NBI) is shared by Japan and the EU. The Japan Atomic Energy Agency as the Japan Domestic Agency (JADA) for ITER contributes to the procurement of dc -1 MV ultra-high voltage (UHV) components such as a dc -1 MV generator, a transmission line and a -1 MV insulating transformer for the ITER NBI power supply. The inverter frequency of 150 Hz in the -1 MV power supply and major circuit parameters have been proposed and adopted in the ITER NBI. The dc UHV insulation has been carefully designed since dc long pulse insulation is quite different from conventional ac insulation or dc short pulse systems. A multi-layer insulation structure of the transformer for a long pulse up to 3600 s has been designed with electric field simulation. Based on the simulation the overall dimensions of the dc UHV components have been finalized. A surge energy suppression system is also essential to protect the accelerator from electric breakdowns. The JADA contributes to provide an effective surge suppression system composed of core snubbers and resistors. Input energy into the accelerator from the power supply can be reduced to about 20 J, which satisfies the design criteria of 50 J in total in the case of breakdown at -1 MV.

2009-01-01

402

Installation and Testing of SNS Magnet Power Supplies  

CERN Document Server

This paper describes the types and quantities of magnet power supplies required for the SNS Linear Accelerator, High-Energy Beam Transport (HEBT), Ring and the Ring-Target Beam Transport (RTBT). There are over 600 magnets and more than 550 magnet power supplies. These magnet power supplies range in size from the bipolar-corrector supplies rated at 35 volts, 20 amps to the main-ring dipole supply that is rated at 440 volts, 6000 amps. The Linac power supplies have a ripple/stability specification of 1000 parts per million while the ring supplies have a specification of 100 parts per million. There are also pulsed power supplies for beam injection and beam extraction. The paper will show acceptance test results from the manufacturers as well as test results performed by the SNS magnet power supply group.

Rust, Kenneth R; Cutler, Roy I; Dewan, Shashi; Holmes, Robert; Lambiase, Robert; Sandberg, Jon; Weaver, Joey T; Wong, Sam; Zeng, Jiaqi

2005-01-01

403

Young people's view of power generation and power supply  

International Nuclear Information System (INIS)

Asked about what they think are the most urgent political problems, the young people ranked unemployment and environmental pollution higher (80 pic) than the problems of energy generation and supply, which are in the third place together with peaceful policy and terrorism (55% priority for each). Young people's problem awareness in the energy sector rather concentrates on nuclear power generation and its hazards than on aspects of future energy supplies. In fact, currently only 38% of the young people expect any electricity supply shortages in the FRG, as compared to 47% in 1982. But as in 1982, seven per cent of the young people today assume that power consumption in the FRG will continue to rise. (orig.).

1987-01-01

404

High voltage links over-crossing Europe  

International Nuclear Information System (INIS)

[en] This is a study about the beneficial aspects and the problems raised by the implementation of a high voltage interconnecting system in Europe. There are stressed advantages as: leveling of the demand curves on account of the different local time, general distribution of the hydroelectric power produced in the northern part of the continent, reducing of the average electric energy costs by eliminating the intermediate agents. As for the environmental impact such a network could be a solution to the following problems: balancing the water resources, the waste water disposal and its treatment, reducing pollution and diminishing the greenhouse effect, acid rains and dangerous gas emission. (C.M.). 8 figs., 1 tab., 9 refs

1996-01-01

405

SNS AC Power Distribution and Reliability of AC Power Supply  

CERN Document Server

The SNS Project has 45MW of installed power. A design description under the Construction Design and Maintenance (CDM) with regard to regulations (OSHA, NFPA, NEC), reliability issues and maintenance of the AC power distribution system are herewith presented. The SNS Project has 45MW of installed power. The Accelerator Systems are Front End (FE)and LINAC KLYSTRON Building (LK), Central Helium Liquefier (CHL), High Energy Beam Transport (HEBT), Accumulator Ring and Ring to Target Beam Transport (RTBT) Support Buildings have 30MW installed power. FELK has 16MW installed, majority of which is klystron and magnet power supply system. CHL, supporting the super conducting portion of the accelerator has 7MW installed power and the RING Systems (HEBT, RING and RTBT) have also 7MW installed power.*

Holik, Paul S

2005-01-01

406

POWER SUPPLY FOR A TATTOO MACHINE  

UK PubMed Central (United Kingdom)

A power supply (10) that includes a housing (12) for retaining the electr onic components needed to operate a tattoo machine (50). The housing (12) in cludes a first region (36) in which the tattooing controls (40) are located and a second region (38) that includes a display screen (30). The first and second regions (36,38) are separated from each so that a plastic covering (5 6) can be drawn over only the first region (36) to protect the tattooing con trols (40) while leaving the display screen (30) unobscured.

COPELAND STEVE A; BYRNES DEAN; CAMPBELL BEN

407

Very low power, high voltage base for a Photo Multiplier Tube for the KM3NeT deep sea neutrino telescope  

CERN Multimedia

The described system is developed in the framework of a deep-sea submerged Very Large Volume neutrino Telescope where photons are detected by a large number of Photo Multiplier Tubes. These PMTs are placed in optical modules (OM). A basic Cockcroft-Walton (CW) voltage multiplier circuit design is used to generate multiple voltages to drive the dynodes of the photomultiplier tube. To achieve a long lifetime and a high reliability the dissipation in the OM must be kept to the minimum. The design is also constrained by size restrictions, load current, voltage range, and the maximum allowable ripple in the output voltage. A surface mount PMT-base PCB prototype is designed and successfully tested. The system draws less than 1.5 mA of supply current at a voltage of 3.3 V with outputs up to -1400 Vdc cathode voltage, a factor 10 less than the commercially available state of the art

Timmer, P; Peek, H; 10.1088/1748-0221/5/12/C12049

2010-01-01

408

Issues on Simulations of Inverter Power Supply  

Directory of Open Access Journals (Sweden)

Full Text Available The modern supply for non-industrial equipment, unlike the industrial power supply installations, must have specific parameters (voltage and frequency). Some modern devices, as the converter – inverter system with static commutation elements, can be used in order to obtain these parameters. The role of the converter in this system is to convert the alternative current of the industrial supplying device to a continuous current; with the help of the inverter the voltage is converted back to alternative voltage.This paper presents the alternative – continuous current conversion bridge (the converter), the continuous – alternative conversion bridge (the inverter) having different switching elements and the PWM command signal generation methods of the semiconductor elements by using the “Matlab–Simulink” graphical environment. The system, converter-inverter, has been simulated for a specific parameters R, L, C. These parameters have been obtained after a designing calculation for a universal load. The simulations presented use the static switching device as optimal for a proper behaviour of the inverter in the case of the given charge.

Ioan Mircea GORDAN; Claudiu MICH-VANCEA

2009-01-01

409

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

Energy Technology Data Exchange (ETDEWEB)

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

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

2001-12-01

410

High voltage switch isolation for implantable cardioverters/defibrillators  

UK PubMed Central (United Kingdom)

A battery powered cardioverter or defibrillator employing a DC-DC converter for charging high voltage output capacitors and for delivering biphasic cardioversion or defibrillation pulses through a bridge circuit including high and low side drive circuits under the control of a microprocessor controlled arrhythmia detection system. Upon the detection of an arrhythmia and the selection of cardioversion/defibrillation therapy, the charging of the high voltage output capacitors is commenced and the capacitor voltage enables a regulated voltage source for the high and low side drive circuits for the high power IGTs of each branch of the bridge circuit. High voltage switching transients are suppressed from re-triggering or otherwise affecting operation of the drive circuits.; Fail-safe circuitry disables operation of the drive circuits in the event that the first and second control signals are inadvertently provided simultaneously or overlap.

THOMPSON DAVID L

411

High voltage switch drive for implantable cardioverter/defibrillator  

UK PubMed Central (United Kingdom)

A battery powered cardioverter or defibrillator employing a DC-DC converter for charging high voltage output capacitors and for delivering biphasic cardioversion or defibrillation pulses through a bridge circuit including high and low side drive circuits under the control of a microprocessor controlled arrhythmia detection system. Upon the detection of an arrhythmia and the selection of cardioversion/defibrillation therapy, the charging of the high voltage output capacitors is commenced and the capacitor voltage enables a regulated voltage source for the high and low side drive circuits for the high power IGTs of each branch of the bridge circuit. High voltage switching transients are suppressed from re-triggering or otherwise affecting operation of the drive circuits. Fail safe circuitry disables operation of the drive circuits in the event that the first and second control signals are inadvertently provided simultaneously or overlap.

KUEHN KEVIN P; ROSSING MARTIN A; BERG WILLIAM C

412

DC power supplies power management and surge protection for power electronic systems  

CERN Document Server

Modern electronic systems, particularly portable consumer electronic systems and processor based systems, are power hungry, compact, and feature packed. This book presents the most essential summaries of the theory behind DC-DC converter topologies of both linear and switching types. The text discusses power supply characteristics and design specifications based on new developments in power management techniques and modern semiconductors entering into the portable electronics market. The author also addresses off-the-line power supplies, digital control of power supply, power supply protection

Kularatna, Nihal

2011-01-01

413

Spark-proof power supply source  

Energy Technology Data Exchange (ETDEWEB)

A spark-proof power supply source contains an electromotive force source, main thyristor, shunting thyristor, auxiliary thyristor, measurement thyristor, sensor which indicates the beginning of charge with control signal generator. The electo motice force source, primary thyristor, measurement thytristor, and sensor indicating the onset of charge are connected in series with the mode. The output of the control signal generator is connected to the control electrode of the shunting thyristor, and control electrode of the auxiliary thyristor is connected to the measurement resistor. In order to improve the spark-proof capacity the power supply source is equipped with a current source, capacitor and threshhold element. The capacitor is connected in parallel to the output of the current source. The current source is connected in series and matched to the electro motive force source. An auxiliary thyristor is connected in parallel to their output. A control electrode of the primary thyristor is c onnected to the output of the current source through the threshhold element.

Podpal' ko, L.F.; Chashchinov, A.V.; Chernov, B.V.; Davydov, V.V.; Kamynin, Yu.N.; Nichik, A.Ya.; Oksengendlev, M.E.; Radchenko, V.I.; Yerygin, A.T.

1980-03-28

414

Development of high-power inverter supply for current drive of FRC plasma  

International Nuclear Information System (INIS)

High-Power RF supply is developed for the current drive of FRC (Field Reversed Configuration) plasma. The rotating magnetic field is produced by the four antennas set in the parallel direction to the geometrical axis of the FRC and faced each other. The sinusoidal currents with shifted phases by 90 degree each other should be supplied to the antennas. The two power supplies are necessary if a pair of the antennas faced oppositely are connected. Considering the plasma parameters, the rotating field of 50-100kHz and 50G at the center axis is expected to be required. We develop the adequate RF power supply for the purpose. The power supply consists of the inverter circuit, the step-up transformer and the LC tank ciruit. For the switching device of the inverter circuit, the IGBT (Insulated Gate Bipolar Transistor) is adopted. The inverter circuit is full bridge type. To operate it at high voltages, its arm consists of the 3 IGBTs arranged series. The output of the inverter is connected to the tank circuit by way of the step-up transformer with air core. The tank circuit is the parallel circuit of the antenna and the capacitor. By the adjustment of the frequency of the inverter output to the resonance frequency of the tank circuit, the large sinusoidal waveform current is obtained. The developed power supply can produce the current of 5kA at 10kV to the dummy antenna with almost the same inductance of the antenna. (author)

2003-01-01

415

Coaxial-type water load for measuring high voltage, high current and short pulse of a compact Marx system for a high power microwave source  

Science.gov (United States)

A coaxial-type water load was used to measure the voltage output from a Marx generator for a high power microwave source. This output had a rise time of 20 ns, a pulse duration of a few hundred ns, and an amplitude up to 500 kV. The design of the coaxial water load showed that it is an ideal resistive divider and can also accurately measure a short pulse. Experiments were performed to test the performance of the Marx generator with the calibrated coaxial water load.

Han, Jaeeun; Kim, Jung-ho; Park, Sang-duck; Yoon, Moohyun; Park, Soo Yong; Choi, Do Won; Shin, Jin Woo; So, Joon Ho

2009-11-01

416

Measurement ot the switching over-voltages at the disconnection of the high voltage shunt reactors in the Romanian power system  

Energy Technology Data Exchange (ETDEWEB)

The paper presents the measurements of the switching over-voltages made in the Romanian Power System, at the 400/220/110 kV Urechesti substation at the disconnection of a 400 kV, 100 MVAr shunt reactor type DFAL, Siemens, Germany, in 3 consecutive versions. The first one is for shunt reactor controlled by live-tank oil circuit breaker, the second one is for shunt reactor controlled by SF6 circuit breaker, and the third one is for shunt reactor controlled by SF6 circuit breaker and synchronize device.

Stroica, Paul Constantin; Merfu, Ion; Stroica, Mihail; Merfu, Marius; Cojocaru, Florian; Stefan, Dinu; Cojocaru, Mihai

2010-09-15

417

Feasibility comparison of heat and power supply options  

International Nuclear Information System (INIS)

The paper analyses three options for heat and power supply of the facility. The most efficient option both for the operator and the government recommended by the Project Design is a trigeneration complex, which completely covers electrical power needs of the project facility, with exceed of the generated power sold to a centralized power supply system. (authors)

2009-01-01

418

Parallel connection of high-power DC/DC power supply based on IGBT device  

International Nuclear Information System (INIS)

Parallel connection technique of DC/DC power supplies is adopted, and DC high-power supply is designed based on IGBT device, which can be used as the plasma displacement fast control power supply for EAST device. Based on the simulation and experiment, satisfactory dynamic and static performance of the DC/DC power supply was obtained. (authors)

2006-01-01

419

Without transformer directly to the high-voltage grid. First commercial Powerformer in a thermal power plant; Ohne Transformator direkt ins Netz. Erstmaliger Einsatz eines Powerformers in einem Waermekraftwerk  

Energy Technology Data Exchange (ETDEWEB)

ABB has developed a completely new generator, Powerformer, which is able to supply electricity directly to the high-voltage grid without the need for a step-up transformer. Here, the basic philosophy of the design of the new generator will be presented as well as the ways that the new generator can improve the efficiency and economics of powerplants. Recently, ABB was awarded a contract on the first commercial Powerformer in the thermal field by a Swedish utility. Some features of that plant will be presented. Finally, some future prospects of Powerformer will be discussed. (orig.) [Deutsch] ABB hat einen voellig neuen Generator, Powerformer genannt, entwickelt, der die elektrische Leistung direkt, d.h. ohne Transformator, in das Hochspannungsnetz einspeisen kann. Die Verfasser erlaeutern die Grundlagen der Powerformer-Technologie und zeigen auf, wie der neue Generator die Effizienz und Wirtschaftlichkeit von Kraftwerken verbessert. Der Powerformer soll erstmals in einem Waermekraftwerk in Schweden eingesetzt werden. Die Verfasser stellen einige Besonderheiten dieses Kraftwerks vor und diskutieren abschliessend die Zukunftsaussichten der Powerformer-Technologie. (orig.)

Owman, F. [ABB Corporate Research, Vaesteraas (Sweden); Soerqvist, T.; Emlinger, A. [ABB Generation AB, Vaesteraas (Sweden)

1999-02-08

420

MST's Programmable Power Supplies: Results and Plans  

Science.gov (United States)

Programmable power supplies for the toroidal field (BT PPS, recently commissioned) and poloidal field (BP PPS, now being designed) will maximize MST's inductive capabilities. The BT PPS gives unprecedented control of MST's toroidal field, and has already produced several key results. For example, it has provided routine reduction of the dominant magnetic fluctuations via inductive current profile control, and it has allowed the first production of tokamak plasmas in MST. These results have been somewhat limited, however, by the present passive control of the poloidal field. The planned BP PPS will augment tremendously MST's inductive control flexibility, and it will maximize MST's plasma current and pulse length. This supply will use IGBT H-bridge modules similar to those in the BT PPS. Groups of three 900-V modules in series will be combined to drive about +/- 80 kA at +/- 2.5 kV into the existing poloidal field transformer, connected at 10:1. The series-triplet topology allows control using seven-level Pulse Width modulation, which provides reduced ripple, noise, and IGBT switching losses.

Holly, D. J.; Chapman, B. E.; McCollam, K. J.; Morin, J. C.; Thomas, M. A.

2011-11-01

 
 
 
 
421

Neutron-induced single event burnout in high voltage electronics  

International Nuclear Information System (INIS)

[en] Energetic neutrons with an atmospheric neutron spectrum, which were demonstrated to induce single event burnout in power MOSFETs, have been shown to induce burnout in high voltage (>3,000V) electronics when operated at voltages as low as 50% of rated voltage. The laboratory failure rates correlate well with field failure rates measured in Europe

1997-01-01

422

RF Compact Modeling of High-voltage MOSFETs  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The High-Voltage MOSFET is used in a wide variety of applications covering from