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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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-sequenceimpedance is directly related to the earth conductivity.