Theoretically, the resistance, inductance and capacitance in per unit length, and the effective length of transmission line cannot be obtained accurately.

理论上讲，输电线路单位长度的电阻、电感、电容以及输电线路的实际长度等参数都是无法精确获得的。

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The effective length of the drag line will be obtained by solving the reverse catenary equation and then the expression of trajectory in actual state will be derived.

通过对反悬链方程的求解推求有效缆长，继而得出了实际状态下的轨迹表达式。

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In actual state, the change of the embedded point and the characteristic of the reverse catenary are taken into account. This paper will propose the concept of effective length of the drag line.

实际状态下，考虑嵌入点的变化和嵌入缆的反悬链特性，提出了拖曳缆有效缆长的概念。

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