The way of neutral grounding in 380V LV distribution system was introduced and the characteristics of grounded and non grounded systems were analyzed.

本文介绍了380V低压配电系统中性点的接地方式，分析了接地与不接地系统特性。

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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.

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。

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When single-phase-to-earth fault occurs on a neutral non-direct grounded power system, it is nexessary for improving the reliability of power supplying to select the faulted line quickly.

中性点非有效接地配电网发生单相接地故障时，尽快选出故障线路对提高电网的供电可靠性有重要意义。

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