In typical six-phase transmission system, half positive sequence, half zero sequence and half negative sequence fault components are independent of the variance of system impedance.

在典型的六相输电系统中，半正序、半零序和半负序故障分量不受系统阻抗变化的影响。

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The phase comparison error is the primary factor leading to mistaken action in the selective leakage protective system of underground LV networks based on zero sequence current direction.

在基于零序电流方向原理的矿井低压电网选择性漏电保护中，比相误差是导致保护误动的主要因素。

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So it is necessary to find some ways for the fault location detection. In the phase-to-earth fault power system, the value of zero-sequence impedance is directly related to the earth conductivity.

这样就降低了供电可靠性，故找出一种新思路使其能更准确有效地判断故障点具有重要意义。

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