Analysis of a SVC Device Filter Capacitor Bank Circuit Breaker Explosion

When SVC device is in operation mode, it can provide fast dynamic reactive power compensation for the system when the power grid is disturbed greatly, and it can improve the voltage stability of the system. With the growing popularity of SVC devices in China, it is particularly important to study the faults of SVC devices in the process of operation. In this paper, the recent explosion of filter capacitor bank breaker in SVC device of a substation which was put into operation earlier in China is analyzed in detail. Through the inspection of equipment after failure, combined with the background of computer monitoring system, relay protection, and fault recording, the failure process is analyzed, and finally five preventive measures are put forward. It can provide guidance for the operation and maintenance of other station capacitor bank breakers, especially for the station capacitor bank breakers installed with SVC device, so as to ensure the safe and stable operation of the power grid.