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Vacuum arc extinguishing chamber employing external rotation magnetic field and DC cutoff method of vacuum arc extinguishing chamber

A technology of vacuum interrupter and rotating magnetic field, which is applied to circuit breaker components and other directions, can solve the problems of small arc voltage and limited application, and achieve the effects of short breaking time, high vacuum arc voltage, and simple maintenance

Inactive Publication Date: 2018-08-24
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the arc voltage is small when the vacuum circuit breaker is extinguished, which limits its application in the field of low-voltage DC breaking

Method used

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  • Vacuum arc extinguishing chamber employing external rotation magnetic field and DC cutoff method of vacuum arc extinguishing chamber
  • Vacuum arc extinguishing chamber employing external rotation magnetic field and DC cutoff method of vacuum arc extinguishing chamber

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0020] The structural diagram of a vacuum interrupter using an externally applied rotating magnetic field provided by the present invention is as follows figure 1 As shown, it mainly includes: a vacuum interrupter 1 and an external rotating magnetic field generating device. The external rotating magnetic field generating device is composed of n pairs of coil units 2, and each pair of coil units 2 is composed of two opposite coils connected in series. N pairs of coil units 2 are symmetrically arranged outside the vacuum interrupter 1, and each pair of coil units 2 has a current i 1 i 2 …i n , the amplitude of the current is arbitrary, the frequency is arbitrary, and the initial phase θ 1 , θ 2 …theta 3 Can differ by any degree.

[0021] The vacuum interrupter using an externally applied rotating magnetic field can be used as a low-voltage DC circuit breaker in c...

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PUM

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Abstract

The invention discloses a vacuum arc extinguishing chamber employing an external rotation magnetic field and a DC cutoff method of the vacuum arc extinguishing chamber, and belongs to the field of a power system circuit breaker. The vacuum arc extinguishing chamber comprises a vacuum arc extinguishing chamber and a plurality of external coil units. The cutoff method comprises the steps of 1) opening a contact of the vacuum arc extinguishing chamber to generate an arc when a fault occurs; 2) enabling currents with phase difference to pass through the plurality of pairs of coils externally arranged outside the vacuum arc extinguishing chamber to generate the rotation magnetic field; and 3) allowing the arc to move under an effect of the rotation magnetic field, rising an arc voltage to a system voltage, and extinguishing the arc so as to achieve cutoff.

Description

technical field [0001] The invention relates to the technical field of power system circuit breakers, in particular to a vacuum interrupter using an externally applied rotating magnetic field and a method for breaking a direct current. Background technique [0002] 1. The low-voltage DC power system is more and more widely used in the field of ship power system, telecommunication equipment power distribution system, subway and other rail transit traction power distribution systems and DC micro-grids composed of renewable energy. Low-voltage DC circuit breakers are key equipment for the safe operation and protection of low-voltage DC power grids, and their performance is critical to the formulation of system protection strategies and engineering realization. However, since the DC current does not have a natural zero-crossing point, the arc extinguishing during the breaking process mainly depends on increasing the arc voltage to limit the current. At present, the relatively m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/18
CPCH01H73/18
Inventor 刘志远易修立王建华耿英三马慧张在秦王静怡刘思远
Owner XI AN JIAOTONG UNIV
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