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。
Use is made of that zero-sequence transformer outputs a voltage signal when phase-failure occurs in three-phase induction motor.
经研究发现，零序变压器输出电压与断相点间电压u _ (A ' A)成正比。
It is found that output voltage of zero-sequence transformer is proportional to voltage UA 'a between phase-failure points.
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