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 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。
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