Most faults in power distribution systems are single phase to ground faults.

小电流接地系统发生最多的故障是单相接地故障。

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Each alarm kit displays the phase to ground insulation through 15-20 branches of the network.

每台报警显示箱可反映15～20条电网支路的单相对地绝缘状态。

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On account of the weak fault current and unstable fault arc, the problems of the single phase to ground fault line selection in the non-solid earthed network have never been thoroughly resolved.

由于故障电流小、电弧不稳定等原因，小电流接地系统单相故障选线问题始终没有得到彻底解决。

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