②检漏继电器采用零序电抗器并不影响选择性漏电保护的实现，而对其可靠工作作用明显；
A feeding switch with a leakage protection function to replace a leakage check relay should not be adopted for practices.
重点介绍零序功率方向继电器的分析及判定方法。
It mainly focuses on analysis and determining method of zero sequence power direction relay.
提出了适用于平行双回线路的零序距离继电器新判据。
A double lines distance relay based on the zero sequence components is presented.
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