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.
采用具有选择性的过电流方向继电器，对这种相互分隔直流系统的保护相对就简单。
Protection for these isolated systems has been a relatively simple task, which is carried out using over current directional relays with selectivity.
选择性：继电器对诸如系统瞬间切换或负载突变之类的无害的异常情况不作反应。
Selectivity: The relay must not respond to abnormal, but harmless, system conditions such as switching transients or sudden changes in load.
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