The earthing method of the metal sheath varies somewhat in different cable lengths, which affects greatly line parameters, especially zero sequence impedance.
对于不同长度的电缆线路其金属护套的接地方式亦不尽相同，从而对电缆线路参数，尤其是对零序阻抗将产生较大的影响。
In the meanwhile it is pointed out that the quantity change of the parallel line and zero-sequence impedance must be retested.
同时还指出平行线路条数变化，零序阻抗均需重新测试。
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。
Autotransformers with all windings in Y-connection result in a Peculiar Zero-Sequence impedance.
全星形自耦变压器结构特殊。造成零序阻抗的特殊性。
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。
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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