±1100kV吉泉线并行交流特高压线路施工中电磁感应及接地分析

在建的±1100 kV吉泉输电线路近距离并行皖电东送特高压1000 kV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感应电问题。本文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。

Research on parallel line induction of 1000 kV Anhui-to-East UHV AC line and suppression measure

The Jiquan ±1100kV transmission line in the construction close multiple parallel Anhui-to-East UHV 1000kV 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 parallelling 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. In the end, a study is conducted on different grounding schemes during construction and the proposed grounding scheme are put forward.