By analyzing the zero-sequence full current for single-phase grounding fault in isolated neutral distribution network, a new approach to determine the faulty transmission line is obtained.

通过对中性点不接地配电网单相接地故障时零序全电流的分析，得出了利用零序全电流的大小和方向进行故障选线的新方法。

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The healthy line is unloaded for zero-sequence component when a single-phase fault occurs in a non-solid earthed network.

小电流接地系统发生单相接地故障时，对零序分量而言，非故障线路相当于空载。

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