CN104391246A - 12kV vacuum circuit breaker arc voltage testing device and method - Google Patents
12kV vacuum circuit breaker arc voltage testing device and method Download PDFInfo
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- CN104391246A CN104391246A CN201410686061.8A CN201410686061A CN104391246A CN 104391246 A CN104391246 A CN 104391246A CN 201410686061 A CN201410686061 A CN 201410686061A CN 104391246 A CN104391246 A CN 104391246A
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Abstract
The invention relates to a 12kV vacuum circuit breaker arc voltage testing device which comprises a high-capacity 12kV test power supply connected with an inlet end of a 12kV vacuum circuit breaker, an outlet end of the 12kV vacuum circuit breaker is grounded, the inlet end of a 12kV vacuum circuit breaker is connected with a voltage divider A, the outlet end of the 12kV vacuum circuit breaker is connected with a voltage divider B, secondary output of the voltage divider A and the voltage divider B is connected with a voltage-limiting protection device, output of the voltage-limiting protection device is connected with an isolation amplifier, output of the isolation amplifier enters a signal processing device, the signal processing device is connected with the front end of an optical fiber transmission system, the front end of the optical fiber transmission system is connected with the tail end of the optical fiber transmission system, and the tail end of the optical fiber transmission system is in bidirectional communication with a computer. Interference of a strong electromagnetic field is effectively suppressed, reliability of testing signals in the transmission process is ensured, and safety of a testing system is improved.
Description
Technical field
The present invention relates to arc voltage proving installation and method, belong to field of electrical testing, specifically a kind of 12kV vacuum circuit breaker arc voltage proving installation and method.
Background technology
Arc voltage is an important parameter that can reflect high-voltage breaker explosion chamber performance, because its difficulty of test is large, so also fewer both at home and abroad about arc voltage testing research.The eighties, Xian High voltage Apparatus Research Institute carried out research to this, the major product of isolating switch was oil-break at that time, its arc voltage is higher, for the feature of oil-break at that time, Xian High voltage Apparatus Research Institute develops a set of arc voltage test macro be made up of low-resistance voltage divider and light oscillograph, for measuring the arc voltage produced in oil-break on/off switch process.In recent years, vacuum circuit breaker and SF
6isolating switch is widely used in electric system, compares oil-break, and its arc voltage is less.Low-resistance voltage divider, for less voltage, affects the equivalence in loop.The core component of light oscillograph is oscillator, and corresponding different signal must adopt different oscillators accurately to measure, and therefore, this cover system is difficult to vacuum circuit breaker and SF
6isolating switch carries out Measurement accuracy.At the beginning of 21 century, Xi'an Communications University establishes a set of single-frequency oscillation circuit, on this basis to 12kV, 630A, clearance between open contacts is that the Arc Voltage Characteristics in Vacuum of the vacuum circuit breaker of 10mm is studied, single-frequency oscillation circuit cannot simulate the situation of cut-offfing short-circuit current, can only be used for studying the voltage characteristic under rated current.For above-mentioned situation, Xian High voltage Apparatus Research Institute devises 40.5kV ~ 252 kV primary cut-out arc voltage test macro in a set of Large Copacity synthetic test loop, the dropout current waveform of test macro and the measurement of arc voltage waveform are not come by a test macro, measure the dropout current waveform obtained asynchronous with arc voltage waveform, thus the arc time cannot be calculated exactly.The testing research work of the 12kV vacuum circuit breaker arc voltage that present widely used arc voltage is lower is but in blank for a long time.Therefore, the Theory and technology of vacuum circuit breaker arc voltage test also needs perfect further.
The arc voltage of vacuum circuit breaker is difficult to measure, mainly be the following aspects: (1) high power laboratory trial voltage 12kV, test current 2 ~ 50kA, the arc voltage signal measured is needed to be only tens volts, be in high voltage heavy current test environment, test site electromagnetic interference (EMI) is very large, affects the reliability of Signal transmissions.(2) when testing wiring, especially short-circuit test electric current reaches 40 ~ 50kA and cannot get rid of the impact of conductor's voltage drop on test result, and the sampling of measuring system directly affects measurement result accuracy.(3) industrial conventional voltage divider cannot meet the test request of arc voltage, and the voltage divider of the special high target of need could realize the measurement to arc voltage waveform.
Summary of the invention
In order to solve above-mentioned existing arc voltage proving installation Problems existing, the invention provides a kind of 12kV vacuum circuit breaker arc voltage proving installation and method of testing, object accurately tests arc voltage waveform, provides technological means for setting up arc physics model.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of 12kV vacuum circuit breaker arc voltage proving installation, include: 12kV vacuum circuit breaker, Large Copacity 12kV experiment power supply, voltage divider A, voltage divider B, protective arrangement for limiting output voltage, isolated amplifier, signal processing apparatus, fibre-optic transmission system (FOTS) front end, fibre-optic transmission system (FOTS) end and computing machine, computing machine is by serial ports RS232 Communication Control dynamic routine controller, described Large Copacity 12kV experiment power supply is connected with 12kV vacuum circuit breaker end of incoming cables, 12kV vacuum circuit breaker leading-out terminal ground connection; 12kV vacuum circuit breaker inlet wire termination voltage divider A; outlet termination voltage divider B; voltage divider A and voltage divider B bis-output is connected protective arrangement for limiting output voltage; protective arrangement for limiting output voltage exports and connects isolated amplifier; isolated amplifier exports entering signal treating apparatus; signal processing apparatus connecting fiber transmission system front end, fibre-optic transmission system (FOTS) front end connecting fiber transmission system end, fibre-optic transmission system (FOTS) end communicates with computer bidirectional.
Described signal processing apparatus is made up of single-chip microcomputer integrated circuit, power module and accumulator.
Described fibre-optic transmission system (FOTS) end turns RS-232 converter by RS-485, RS-485 and computing machine realizes two-way communication.
A method of testing for 12kV vacuum circuit breaker arc voltage proving installation, comprises the following steps:
12kV vacuum circuit breaker is in closing position, dynamic routine controller sends " combined floodgate " instruction to Large Copacity 12kV experiment power supply isolating switch makes it close a floodgate, short-circuit current i is had to pass through in such test loop, dynamic routine controller sends " separating brake " instruction to 12kV vacuum circuit breaker and makes its separating brake, at this moment voltage signal is by voltage divider A, voltage divider B carries out dividing potential drop, the voltage signal that voltage divider secondary exports is transferred to protective arrangement for limiting output voltage amplitude limit, thus retain the voltage signal of-1V ~ 1V, then carry out isolation through isolated amplifier 7 to amplify, it is made to become the voltage signal of-10V ~ 10V, such signal processing apparatus can receive and carry out data processing, calculate arc voltage signal to export with digital signal after analog to digital conversion in device inside, digital signal is through the electro-optic conversion effect of fibre-optic transmission system (FOTS) front end, digital signal is converted into light signal.Light signal to fibre-optic transmission system (FOTS) end, becomes digital signal by Optical Fiber Transmission after electro-optic conversion, digital signal by RS-485, RS-485 turn RS-232 converter finally by this Signal transmissions to computing machine.
The advantage that the present invention has and beneficial effect are:
(1) protective arrangement for limiting output voltage in the present invention, isolated amplifier, signal processing apparatus and fibre-optic transmission system (FOTS) are made of one; be enclosed in EMC(electromagnetic compatibility) shell in; analog signals is directly converted to digital signal by its front end; its end utilizes Optical Fiber Transmission that digital signal is directly turned RS-232 converter by a RS-485 and is transferred to and adopts on computing machine; restrained effectively the interference of strong-electromagnetic field; ensure that the reliability of test signal in transmitting procedure, and improve the security of test macro.
(2) the present invention adopts differential type data acquisition modes, namely the direct measurement point by voltage divider is put in breaker fracture both sides and carries out data acquisition, then Difference Calculation is carried out at signal processing apparatus, reduce conductor's voltage drop to greatest extent to the impact of test result, improve the accuracy of signals collecting.
(3) the present invention can Measurement accuracy arc voltage waveform, and can be judged the position of arcing point and blow-out point by test waveform, its performance can reach the requirement on industrial test completely.
(4) the 12kV vacuum circuit breaker arc voltage method of testing of the present invention's employing, fill up the blank of domestic high power laboratory room 12kV vacuum circuit breaker arc voltage measuring technology, supplement and enriched the arc voltage theory of testing, simultaneously also for the data acquisition of other high voltages, cranking test provides technological means.
(5) the inventive method is to the measurement of 12kV vacuum circuit breaker arc voltage waveform, in conjunction with on/off switch coil current signal and the short-circuit test current signal of vacuum circuit breaker, thus calculate opening time and arc time exactly, for client provide more abundant, high-quality test figure accurately, serve client better, the market competitiveness of strengthen test room.
(6) the inventive method has carried out computational analysis to choosing of voltage divider ratio, and the difference proposing voltage divider ratio reciprocal can not more than 10
-5special technique index, choose voltage divider than for 100:1, test findings shows that system has very strong anti-common mode interference ability.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representations.
In figure: 12kV vacuum circuit breaker 1; Dynamic routine controller 2; Large Copacity 12kV experiment power supply 3; Voltage divider A4; Voltage divider B5; Protective arrangement for limiting output voltage 6; Isolated amplifier 7; Signal processing apparatus 8; Fibre-optic transmission system (FOTS) front end 9; Fibre-optic transmission system (FOTS) end 10; Computing machine 11.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, a kind of 12kV vacuum circuit breaker of the present invention arc voltage proving installation, include: 12kV vacuum circuit breaker 1, Large Copacity 12kV experiment power supply 3, voltage divider A4, voltage divider B5, protective arrangement for limiting output voltage 6, isolated amplifier 7, signal processing apparatus 8, fibre-optic transmission system (FOTS) front end 9, fibre-optic transmission system (FOTS) end 10 and computing machine 11, computing machine 11 is connected with dynamic routine controller 2 by RS232 serial ports, described Large Copacity 12kV experiment power supply 3 is connected with 12kV vacuum circuit breaker 1 end of incoming cables, 12kV vacuum circuit breaker 1 leading-out terminal ground connection; 12kV vacuum circuit breaker 1 inlet wire termination voltage divider A4; outlet termination voltage divider B5; voltage divider A4 and voltage divider B5 bis-output is connected protective arrangement for limiting output voltage 6; protective arrangement for limiting output voltage 6 exports and connects isolated amplifier 7; isolated amplifier 7 exports entering signal treating apparatus 8; signal processing apparatus 8 connecting fiber transmission system front end 9, fibre-optic transmission system (FOTS) front end 9 connecting fiber transmission system end 10, fibre-optic transmission system (FOTS) end 10 and computing machine 11 two-way communication.Computing machine 11 to be connected with dynamic routine controller 2 by serial communication interface RS232 and to send sequential control instruction, and dynamic routine controller 2 exports and controls triode ON control 12kV vacuum circuit breaker 1 on/off switch wire loop and Large Copacity 12kV experiment power supply 3 isolating switch on/off switch wire loop.
Described protective arrangement for limiting output voltage, isolated amplifier, signal processing apparatus and fibre-optic transmission system (FOTS) are made of one, and are enclosed in EMC(electromagnetic compatibility) shell in.
Described signal processing apparatus 8 is made up of single-chip microcomputer integrated circuit, power module and accumulator.
Described fibre-optic transmission system (FOTS) end 10 turns RS-232 converter by RS-485, RS-485 and computing machine 11 realizes two-way communication.
A kind of method of testing of 12kV vacuum circuit breaker arc voltage proving installation comprises the following steps:
12kV vacuum circuit breaker 1 is in closing position, dynamic routine controller 2 pairs of Large Copacity 12kV experiment power supply 3 isolating switchs send " combined floodgate " instruction makes it close a floodgate, short-circuit current i is had to pass through in such test loop, dynamic routine controller 2 pairs of 12kV vacuum circuit breakers 1 send " separating brake " instruction and make its separating brake, at this moment voltage signal carries out dividing potential drop by voltage divider A4, voltage divider B5, the present invention has carried out computational analysis to choosing of voltage divider ratio, and voltage divider can not more than 10 than difference reciprocal
-5, choose voltage divider than being 100:1.The voltage signal that voltage divider secondary exports is transferred to protective arrangement for limiting output voltage 6 amplitude limit, thus retain the voltage signal of-1V ~ 1V, then carry out isolation through isolated amplifier 7 to amplify, it is made to become the voltage signal of-10V ~ 10V, such signal processing apparatus 8 can receive and carry out data processing, calculate arc voltage signal to export with digital signal after analog to digital conversion in device inside, digital signal is through the electro-optic conversion effect of fibre-optic transmission system (FOTS) front end 9, digital signal is converted into light signal, light signal by Optical Fiber Transmission to fibre-optic transmission system (FOTS) end 10, digital signal is become after electro-optic conversion, digital signal passes through RS-485, RS-485 turn RS-232 converter finally by this Signal transmissions to computing machine 11, signal will be recorded by arc voltage testing software to show intuitively on the computer screen in graph form, signal will be recorded by arc voltage testing software to show intuitively on the computer screen in graph form.
The present invention adopts differential type data acquisition modes, and namely the direct measurement point by voltage divider is put in breaker fracture both sides and carries out data acquisition, then carries out Difference Calculation at signal processing apparatus.
Claims (4)
1. a 12kV vacuum circuit breaker arc voltage proving installation, it is characterized in that including: 12kV vacuum circuit breaker, Large Copacity 12kV experiment power supply, voltage divider A, voltage divider B, protective arrangement for limiting output voltage, isolated amplifier, signal processing apparatus, fibre-optic transmission system (FOTS) front end, fibre-optic transmission system (FOTS) end and computing machine, computing machine is connected with dynamic routine controller 2 by RS232 serial ports, described Large Copacity 12kV experiment power supply is connected with 12kV vacuum circuit breaker end of incoming cables, 12kV vacuum circuit breaker leading-out terminal ground connection; 12kV vacuum circuit breaker inlet wire termination voltage divider A; outlet termination voltage divider B; voltage divider A and voltage divider B bis-output is connected protective arrangement for limiting output voltage; protective arrangement for limiting output voltage exports and connects isolated amplifier; isolated amplifier exports entering signal treating apparatus; signal processing apparatus connecting fiber transmission system front end, fibre-optic transmission system (FOTS) front end connecting fiber transmission system end, fibre-optic transmission system (FOTS) end communicates with computer bidirectional.
2. a kind of 12kV vacuum circuit breaker arc voltage proving installation according to claim 1, is characterized in that described signal processing apparatus is made up of single-chip microcomputer integrated circuit, power module and accumulator.
3. a kind of 12kV vacuum circuit breaker arc voltage proving installation according to claim 1, is characterized in that described fibre-optic transmission system (FOTS) end turns RS-232 converter by RS-485, RS-485 and computing machine realizes two-way communication.
4. a method of testing for 12kV vacuum circuit breaker arc voltage proving installation, is characterized in that comprising the following steps:
12kV vacuum circuit breaker is in closing position, dynamic routine controller sends " combined floodgate " instruction to Large Copacity 12kV experiment power supply isolating switch makes it close a floodgate, short-circuit current i is had to pass through in such test loop, dynamic routine controller sends " separating brake " instruction to 12kV vacuum circuit breaker and makes its separating brake, at this moment voltage signal is by voltage divider A, voltage divider B carries out dividing potential drop, the voltage signal that voltage divider secondary exports is transferred to protective arrangement for limiting output voltage amplitude limit, thus retain the voltage signal of-1V ~ 1V, then carry out isolation through isolated amplifier to amplify, it is made to become the voltage signal of-10V ~ 10V, signal processing apparatus receives and carries out data processing, calculate arc voltage signal to export with digital signal after analog to digital conversion in device inside, digital signal is through the electro-optic conversion effect of fibre-optic transmission system (FOTS) front end, digital signal is converted into light signal, light signal by Optical Fiber Transmission to fibre-optic transmission system (FOTS) end, digital signal is become after electro-optic conversion, digital signal passes through RS-485, RS-485 turn RS-232 converter finally by this Signal transmissions to computing machine.
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Cited By (3)
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| CN104977531A (en) * | 2015-07-22 | 2015-10-14 | 上海电气输配电试验中心有限公司 | 126kV synthesis loop arc voltage online detection system |
| CN106771785A (en) * | 2017-02-24 | 2017-05-31 | 锐思特电子科技（苏州）有限公司 | Electric hammer electric spark value test device |
| CN108732493A (en) * | 2018-06-21 | 2018-11-02 | 沈阳工业大学 | A kind of experimental rig and method being suitable for measuring arc voltage |
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| CN203232136U (en) * | 2013-04-16 | 2013-10-09 | 苏州电器科学研究院股份有限公司 | Arc voltage measuring device of high-voltage circuit breaker |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977531A (en) * | 2015-07-22 | 2015-10-14 | 上海电气输配电试验中心有限公司 | 126kV synthesis loop arc voltage online detection system |
| CN106771785A (en) * | 2017-02-24 | 2017-05-31 | 锐思特电子科技（苏州）有限公司 | Electric hammer electric spark value test device |
| CN108732493A (en) * | 2018-06-21 | 2018-11-02 | 沈阳工业大学 | A kind of experimental rig and method being suitable for measuring arc voltage |
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