... 电源阻抗 supply impedance 高阻抗故障 high impedance failure 电源阻抗被认为是无穷大时的故障（见附录G）。 ...
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Because high impedance fault doesn’t draw enough fault current to operate overcurrent protective devices, it is hard to detect it.
由于高阻抗故障引起的故障电流较小,不能使过流保护装置产生动作,因此它的检测比较困难。
参考来源 - 配电网高阻抗故障时频检测方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
尤其较好地解决了高阻抗非线性故障的识别问题。
Especially it solves the identification problem of high impedance fault well.
对于后备保护装置防止高阻抗接地故障，将配置一只双极方向过电流继电器，同瞬时跳闸附件的时间成反比。
For backup protection against high resistive ground faults, there will be a dual polarized directional overcurrent relay, inverse time with instantaneous trip attachment.
首先通过测量阻抗轨迹法对异相短路故障的测量阻抗的进行分析，得出牵引网发生异相高阻电弧短路故障时，常规原理的阻抗保护将拒动的结论。
Conventional impedance relay will refuse to trip according to an analysis of measuring impedance by means of impedance locus method when wrong-phase-coupling of traction power supply system occurs.
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