Zero-sequence current criterion, negative sequence current criterion and phase current variation can be used to improve the performance of breaker failure protection for ACF sub-bank.

针对单纯采用相电流判据的不足之处，本文提出增加零序电流、负序电流及电流变化量判据，以有效地避免保护误动或者拒动。

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At the time of failure, no matter what kind of start state of voltage phase, the zero-sequence transient current has the characteristic of inverse phase.

在故障时刻，无论故障相电压的相位处在何种初始状态下，都有零序电流反向的特征。

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Use is made of that zero-sequence transformer outputs a voltage signal when phase-failure occurs in three-phase induction motor.

这种新方法的基础是零序变压器在三相异步电动机断相时输出一个电压信号。

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