Grounding state of Overhead Line Tower in transmission grids has an important significance for security and steady operation of power system.

输电线路杆塔接地状况对电力系统的安全稳定运行具有重要意义。

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The overhead line of HVDC power transmission system needs positive and negative leads only, allowing for high power, low loss and long distance power transmission;

高压直流输电系统架空线路只需正负两 极导线，可实现大功率、低损耗、长远距离电 力的直接输送；

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