±1100 kV吉泉线并行交流特高压线路施工中电磁感应及接地分析

Research on electromagnetic induction and grounding analysis of Jiquan ± 1 100 kV Anhui-to-East UHV parallel AC line construction

在±1100kV吉泉输电线路近距离并行皖电东送特高压1000kV交流输电线路,由于线路间的电磁耦合使得吉泉线在施工中面临严重的电磁感应问题。文章建立了三维输电线路的矩量法模型,计算分析了并行双回特高压交流线路施工时的感应电压和感应电流,对影响静电感应电压和电磁感应电流的主要因素进行了分析。最后,针对施工中的不同接地方案进行了研究,提出了施工中建议的接地方案。

The Jiquan±1100 kV transmission line in the construction close multiple parallel Anhui-to-East UHV 1000 kV AC transmission lines.Since the electromagnetic coupling between the lines makes the Jiquan transmission line in the construction facing serious problems of induction.A three-dimensional moment method model for transmission lines is established in this paper.And the induced voltage and induced current of the Jiquan transmission line under construction,which is in parallel with a double-circuit UHV AC line,are calculated and analyzed.The main factors affecting electrostatic induction voltage and electromagnetic induction current are also analyzed.Finally,a study is conducted on different grounding schemes during construction and the proposed grounding scheme are put forward.