Aiming at the problem of overvoltage caused by the restrike of the vacuum circuit breaker switching capacitor bank and NSDD

through the analysis on the restrike caused by switching capacitor bank and NSDD typical waveform

at the same time

in the past 5 years

the breakdown and the NSDD number of the vacuum circuit breaker in the type test and burn-in test

in the neutral ungrounded system

the NSDD number is much larger than the restrike number

the restriking and NSDD

the overvoltage between capacitor electrodes or breaks of vacuum breaker has no difference. Therefore

the harm of NSDD to the capacitor cannot be ignored.