This paper studied the transmission lines when earthing fault fault phase selection criterion.

本文研究了输电线路接地故障时的故障选相判据。

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Currently used fault phase selector components are compared and their characteristics and shortcomings are pointed out.

对目前实用的突变量及稳态量选相元件进行了比较，指出了其特点和存在的不足。

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The fault phase selector discussed is based on the result that the fault component of sound phases is zero when a single-phase-to-ground fault occurs.

文中所探讨的相电流突变量选相元件，是利用单相接地故障时，两健全相相间电流突变量为零这一特征来得到的。

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