该判据对接地故障具有很高的选择性能。
This action criterion shows that it is highly selective to the ground fault.
具有高可靠的异向接地故障电流开断能力；
With high & reliable ground fault current breaking capacity;
单相接地故障仍是矿山电网的主要事故形式。
Single-phase grounded failure is still the main reason of mine power-net fault.
直流系统环网是接地故障检测中的一个关键因素。
Loop net of DC system is an important factor in the grounding fault detection.
分析了采用小电阻接地系统的必要性及该系统的故障特性。
The necessity of low resistance ground system and its fault characteristic were analyzed.
分析了采用小电阻接地系统的必要性及该系统的故障特性。
The necessity of low resistance ground system and its fault characteristic were analyzed.
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