So, it is significant to prevent the occurrence of faulted neutral line within the circuit of three phase and four line system.
因此，防止三相四线制配电回路断零事故的发生，具有更广泛的意义。
The circuit breaker after getting command from the protective relay, disconnects only the faulted element.
从后得到的保护继电器命令断路器，只有断开故障因素。
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