本文研究了输电线路接地故障时的故障选相判据。
This paper studied the transmission lines when earthing fault fault phase selection criterion.
线路接地故障是配电网最频发的故障，也是配网运行面临的主要问题。
Line grounding fault is the most frequency failure for distribution network, and is also the major problem that distribution network operation is faced with.
因此，小电流接地系统线路故障的快速自动定位对于提高供电可靠性、减少停电损失具有重要的意义。
Therefore, locating fault position fastly and automatically is significant to improve the power supply reliability and reduce the outage loss.
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