This kind of fault is caused by the circuit breaker body. For the low oil circuit breaker, it is mainly manifested as fuel injection short circuit, arcing chamber burning loss, insufficient breaking capacity, explosion when closing, etc. For vacuum circuit breaker, it is manifested by air leakage of arc extinguishing chamber and bellows, reduction of vacuum degree, re ignition of cut-off capacitor bank, rupture of ceramic tube, etc.

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