蓝磊;张韬;文习山;王羽;邓冶强;王健;黄强;裴欢;

• 1:武汉大学电气与自动化学院

摘要(Abstract)：

雷害是输电线路故障的主要原因之一,而当前±1100kV特高压直流输电线路雷电屏蔽系统的设计主要借鉴较低电压等级输电线路的运行经验,因此有必要开展模型试验为对±1100kV直流输电线路的雷电屏蔽性能进行研究。首先针对铁塔表面发生电晕时的电场强度幅值和变化率确定了采用负极性250/2500μs操作冲击电压波,然后开展了以±1100kV特高压直流输电线路Z38102AL型铁塔为对象的模型比例为1:12.5的平原情况下雷电屏蔽模拟试验,并开展高速摄影观测。进行试验绕击概率统计分析,得到±1100kV输电线路绕击概率的空间分布近似为抛物线,且正极性工作电压下,线路的屏蔽性能差;杆塔另一侧的负极性导线对靠近高压电极一侧的正极性导线的引雷能力有一定削弱作用,但对避雷线和大地的屏蔽性能影响不大。并将试验结果与交流500 kV线路模型试验进行对比,说明在缩比模型试验中应尽可能采用大的缩比比例,以在负保护角情况下有效避免夸大避雷线的引雷能力,提高模型有效性。根据高速摄影机观测结果分析了绕击输电线路放电过程,并开展电压波形同步分析,说明了导线的负极性电压对迎面流注起始和发展以及下行先导发展的抑制作用。

关键词(KeyWords)： 雷电屏蔽;特高压直流输电;绕击;模型试验;放电观测

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFB0900800);; 国家电网公司科技项目(GY71-17-041)~~

作者(Author): 蓝磊;张韬;文习山;王羽;邓冶强;王健;黄强;裴欢;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.2966

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