Study on the Lightning Withstand Performance of Back Striking for the ±1100kV UHVDC Large Crossing Overhead Transmission Line

Wei Shi, Pipei Zhang, Jinxia Yao, Haiyan Yuan, Jingguo Ren
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Abstract

Large crossing overhead transmission lines are usually erected on the ultra-high towers with long span, and its lightning withstand performance should be paid more attention to. Considering the propagation process of lightning current along the high tower, an improved simulation model of back striking was established by using the electromagnetic transient program, and then the lightning withstand performance of back striking under different conditions for the ± 1100kV UHVDC large crossing line were studied. The results show that comparing with the conventional transmission line for the ±1100kV UHVDC project, the large crossing section has a much lower lightning withstand level of back striking (LWLBS); The LWLBS for the large crossing line with high tower is not significantly affected by the footing resistance, while enhancing the insulation level can effectively improve the LWLBS. Furthermore, the LWLBS increases with the increase of the distance between striking point and the tower when lightning strikes the large crossing overhead ground wire.
±1100kV特高压直流大型架空输电线路背击耐雷性能研究
大型跨架空输电线路通常架设在跨度较大的超高塔上,其耐雷击性能应受到重视。考虑雷电电流沿高塔的传播过程,利用电磁暂态程序建立了改进的反击仿真模型,研究了±1100kV特高压直流大型交叉线路在不同条件下的反击耐雷性能。结果表明:在±1100kV特高压直流工程中,与常规输电线路相比,大断面的抗雷击水平(LWLBS)明显降低;高塔大型跨线的横载载荷受基础阻力影响不大,提高绝缘等级可有效改善横载载荷。此外,当雷击大型交叉架空地线时,LWLBS随雷击点与塔的距离增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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