750kV架空输电线路线下感应电压实测分析及控制对策

为明确750 kV架空输电线路线下感应电压的影响因素,对宁夏境内多条750 kV线路线下感应电压进行实测分析并总结相关规律。结果表明:同一线路其线下感应电压值与测试时间、环境温湿度无关,与导线排列方式、线下有无树木、有无其他线路交叉穿越有关。对实际的某750 kV线路线下电磁环境进行仿真,进一步验证了实测分析结果及抑制感应电压的必要性。最后提出了750 kV线路线下感应电压控制对策。

Measurement analysis and control strategy of the induced voltage under 750 kV overhead transmission line

In order to clarify the influencing factors of induced voltage under 750 kV overhead transmission line, the induced voltage of several 750 kV lines in Ningxia was measured and analyzed and the relevant laws were summarized. The results show that the induced voltage value of the same line has nothing to do with the test time, environmental temperature and humidity, and connected with the arrangement of wires, whether there are trees under the line or other lines crossing. The simulation of the electromagnetic environment under an actual 750 kV line had implemented, further confirmed the analysis results and the necessity of suppressing induced voltage. Finally, the control strategy of induced voltage under the 750 kV lines was proposed.