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Post arc current measurement method based on current transfer characteristics and magnetic blowout

A technology of transfer characteristics and measurement methods, applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of low measurement accuracy, shunt interference, weak signal, etc., achieve low control accuracy requirements, and avoid ground interference signals , the effect of high measurement accuracy

Inactive Publication Date: 2017-04-26
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

This method has high requirements on the heat capacity of the coaxial shunt and the control accuracy of the mechanical switch, and the signal is weak and has ground interference.
Another measurement method is to use a shunt or a special Rogowski coil to measure directly, but due to the large difference between the main current and the back-arc current (the main current is generally tens of thousand amps, while the back-arc current is generally 1~2 amps) Current measuring equipment such as shunts or special Rogowski coils are difficult to withstand large currents and can accurately measure small currents. Unable to get accurate absolute time signal and complicated design

Method used

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  • Post arc current measurement method based on current transfer characteristics and magnetic blowout
  • Post arc current measurement method based on current transfer characteristics and magnetic blowout
  • Post arc current measurement method based on current transfer characteristics and magnetic blowout

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Embodiment Construction

[0020] The structure of the embodiment of the present invention is as figure 1 As shown, a vacuum switch 1 is provided, and the vacuum switch 1 is a prior art, preferably a vacuum switch driven by a fast repulsion mechanism. The structure of the vacuum switch driven by the rapid repulsion mechanism is that there are inlet terminals connected to the contacts, outlet terminals, vacuum interrupters, insulating pull rods, overtravel connectors, rapid repulsion mechanisms, displacement sensors, drive and intelligent control systems and Optical communication terminal, etc. In the embodiment of the present invention, a main current sensor 4 is connected in series with the inlet terminal 2 or the contact outlet terminal 3 of the vacuum switch 1 to detect the main current I. The vacuum switch current sensor 6 connected in series with the vacuum switch contact 5 is connected between the 3 for detecting the branch current of the vacuum switch I 1， In parallel with the vacuum switch c...

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Abstract

The present invention relates to a post arc current measurement method without ground interference and with high precision based on current transfer characteristics and magnetic blowout. With the current transfer characteristics as a basis, with magnetic field arc blow as auxiliary, the isolation measurement of a measurement circuit and a main circuit is realized, and a ground interference signal is effectively avoided. At the same time, through transfer branch resistance parameter design and a magnetic blowout effect, the current of a resistance branch can be effectively controlled, thus a vacuum switch is switched off after a main current peak, and thus the control precision requirement of the vacuum switch is low. The method has the advantages of high measurement precision, less interference, and high reliability. In addition, through optical fiber isolation control and data communication, the on-line measurement of the post arc current of a power system can be satisfied.

Description

technical field [0001] The invention belongs to the field of back-arc current measurement of medium and high-voltage circuit breakers, and in particular relates to a back-arc current measurement method based on current transfer characteristics and magnetic blow without ground interference and with high precision. Background technique [0002] Subsequently, the construction of national smart grid and the increase of grid capacity put forward higher requirements for the protection switch of high voltage smart grid - high voltage circuit breaker. When the circuit breaker breaks a large current, there is a back-arc current under the action of the transient recovery voltage (TRV) due to the residual plasma in the arc gap after the current crosses zero. The back-arc current can be used to judge the breaking performance of the circuit breaker, and is an important parameter in the breaking process of the circuit breaker. [0003] At present, one of the measurement methods for the b...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01R19/00
CPCG01R31/3271G01R19/0046
Inventor 廖敏夫葛国伟段雄英黄智慧卢刚邹积岩
Owner DALIAN UNIV OF TECH
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