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。
The earthing method of the metal sheath varies somewhat in different cable lengths, which affects greatly line parameters, especially zero sequence impedance.
第三种方法采用电缆线路的分布参数线路模型，根据功率平衡原理推导出故障测距方程，并通过搜索迭代方法解之。
The last proposed method is based on the distributed parameter model, the algorithm utilizes searching and iteration methods to locate the fault point.
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