谐振对消弧线圈的影响分析

Analysis of Impact of Harmonic Vibration on Arc Suppression Coil

中性点经消弧线圈接地的企业供电系统内部过电压事故较频繁的原因主要有三方面:一是谐振过电压得不到有效抑制;二是绝缘配合裕度低;三是谐波引发高频电弧重燃过电压等事故。上述三方面问题均限于消弧线圈原理所致。分析了谐振对消弧线圈保护效果和作用,以改进中性点接地方式时预防系统中的谐振过电压,降低事故率。

Frequent overvoltage faults take place in the power supply system of the en terprises whose neutral points earth via the arc suppression coil. The causcs are Ks fol lows： firstly, harmonic vibration overvoltage can not be suppressed; secondly, insulation coordi nation margin is low; thirdly, overvoltage faults occur due to high frequency arc reignition caused by harmonic. The above issues are caused by the principle of arc suppression coil. The protection effect and function of harmonic vibration on the arc suppression coil are ana lyzed to prevent harmonic vibration overvoltage in the system during improving neutral point grounding mode, and to reduce fault rate.