So, it is significant to prevent the occurrence of faulted neutral line within the circuit of three phase and four line system.

因此，防止三相四线制配电回路断零事故的发生，具有更广泛的意义。

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Then the idea of integral control of automatic resonance and single-phase earth faulted line selection was put forward.

并在此基础上给出了补偿电网中消弧线圈自动调谐与单相接地故障选线一体化的综合控制思路。

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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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