本文推导出用结点阻抗矩阵进行中性点不接地系统中任意两点异相接地故障计算公式，并编制程序在IBM机上调试通过，最后进行了算例分析。
This paper has derived calculating formulas of arbitrary two point faults in neutral non-grounded power system by bus impedance matrix. An example of calculation is carried out with IBM computer.
通过对比电缆整定的单位千米阻抗值和电压电流值，来确定线路上的故障点。
Power lines have set impedance per kilometre and using this value and comparing voltage and current the distance to a fault can be determined.
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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