Capacitor damage is a frequent occurrence in the substation

which

especially in switching shunt capacitor by vacuum circuit breaker

affects seriously safe operation of shunt capacitor.For repeatedly multi-phase restrike fault of shunt capacitor during opening operation in this paper

the process is simulated by ATPDraw simulation procedure based on data of wave recorder and disassembly inspection of capacitor.The analysis results indicate that the main reason of the capacitor dielectric breakdown is the overvoltage and inrush current which caused by multiple restrikes during the vacuum circuit breaker opening;and reduce reignition rate of vacuum circuit breaker switching capacitor is crucial to reduce the fault of shunt capacitor.