一起因谐振引起的并联电容器组爆裂故障分析

Analysis of a Burst Fault of Shunt Capacitor Bank Caused by Suspected Resonance

并联电容器装置是电力系统中无功补偿的重要设备,但容易受系统谐波影响,如装置参与与系统不匹配,会发生严重故障。本文分析了某110 kV变电站发生的一起10 kV电容器组爆燃故障的现象。用排除法锁定分析了电容器组发生故障的可疑点,再通过计算对比,确定电容器组发生故障的根本原因是与系统发生谐振,并针对本次故障暴露出的问题,提出了防止类似故障的改进措施。

Shunt capacitors are important equipment for reactive power compensation in the power system,but it is easily affected by harmonics.If the parameters of the equipment does not match the system,serious fault will occur.This paper reports a fault in a 110 kV substation where a 10 kV capacitor bank burst into flames.The suspicious points of capacitor bank fault are proposed and then analyzed by the exclusive method.Through calculation and comparison,it is determined that the root cause of the fault of the capacitor bank is resonance with the system.In view of the problems exposed by the fault,improvement measures are proposed to prevent similar faults.