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. 在典型的六相輸電系統(tǒng)中，半正序、半零序和半負(fù)序故障分量不受系統(tǒng)阻抗變化的影響。
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. 這樣就降低了供電可靠性，故找出一種新思路使其能更準(zhǔn)確有效地判斷故障點(diǎn)具有重要意義。