直流接地极线路与同塔或同走廊架设交流输电线路相互影响

为节省线路走廊占地，直流接地极线路会部分与站外交流电源线路同塔共架或同走廊架设，2种架设方式均存在交流线路和直流接地极线路相互影响的问题。采用电磁暂态计算程序，对接地极线路与35 kV交流线路同塔共架和接地极线路与330 kV交流线路同走廊架设条件下，交流线路和直流接地极线路的相互影响进行研究。结果表明：直流接地极线路与35 kV交流线路同杆共架时，35 kV交流线路在直流接地极线路上产生的感应电动势很小，最高感应电动势小于2 kV，对直流系统不会造成影响；直流接地极线路在35 kV交流系统上产生的感应电动势远小于35 kV交流设备的绝缘水平，对35 kV交流系统的安全运行不会造成危害。直流接地极线路与330 kV交流线路同走廊架设时，330 kV交流线路在直流接地极线路上产生的最高感应电动势不大于18 kV，对直流接地极线路的安全运行不会造成危害。研究结果对保障交流线路和直流接地极线路的安全稳定运行具有重要意义。

Mutual Influence Research of DC Grounding Electrode Line and AC Transmission Line on Same Tower or Corridor

To save the land occupation of line corridor, parts of DC grounding electrode lines may be set up with AC external power lines on the same tower or corridor. These two layouts both have the mutual influence problems of AC lines and DC grounding electrode lines. By using electromagnetic transient program (EMTP), the mutual influences of AC transmission lines and DC grounding electrode lines were studied on the condition that grounding electrode lines were set up with 35 kV AC transmission lines on same tower or with 330 kV AC transmission lines on same corridor. The results show that: when DC grounding electrode lines are set up with 35 kV AC transmission lines on same tower, the induced electromotive force caused by 35 kV AC lines on DC grounding electrode lines is little, its maximum value is less than 2 kV, which will not affect the DC system； the induced electromotive force caused by DC grounding electrode lines on 35 kV AC system is far less than the insulation level of 35 kV AC equipments, which will not cause harm to the safe operation of 35 kV AC system； when DC grounding electrode lines are set up with 330 kV AC transmission lines on same corridor, the maximum induced electromotive force caused by 330 kV AC line on DC grounding electrode lines is not more than 18 kV, which will not cause harm to the safe operation of DC grounding electrode lines. The research result has great significance for ensuring the safe and stable operation of AC lines and DC grounding electrode lines.