This paper analyses selectors of transverse differential current direction protection using two types polarizing voltage for double circuit lines on the same tower.

对两种极化电压下的横联差动电流方向保护的选择元件在同杆并架双回线故障下的动作行为进行了研究。

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The validity check of zero-sequence operating direction for transformer directional over-current protection is also essential.

另外还需要进行变压器零序方向过电流保护动作方向正确性的检查。

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