main protection earthing point 主保护接地点
neutral point earthing [电] 中性点接地
Earthing reference point 接地基准点
earthing resistor of neutral point 中性接地电阻
neutral-point earthing 中性点接地
point earthing 点接地
one-point earthing 单点接地
one point earthing 一点接地
The signal of DC can only flew from the injection point and the earthing point,so the method can settle all the faults of the single-phase-to earth,such as large resistor,fault line with long and short branches,and et al.
直流信号仅在注入点和接地点之间形成回路,定位可靠性高,可以解决一切单相接地故障的定位问题。
参考来源 - 中性点非有效接地系统单相接地故障定位方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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