介绍了煤矿井下设置保护接地网的原因及重要性。
The reasons and importance of setting underground protective grounding net to coal mine are introduced.
保护接地；
服务主密钥直接或间接地保护树中的所有其他密钥。
The service master key directly or indirectly secures all other keys in the tree.
因为我们的电箱必须使用未接地在德国，保护开关。
Because our electrical boxes must be used are not grounded in Germany, the protection switch.
零序电流保护是一种重要的接地保护方法。
The zero-sequence current protection is an important means of power system ground protection.
指出传统的接地保护原理的不足。
The shortage of traditional single-phase ground fault protection principle is pointed out.
指出传统的接地保护原理的不足。
The shortage of traditional single-phase ground fault protection principle is pointed out.
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