空气间隙放电对于直流输电线路耐雷性能的影响  

Research on Influence of Air Gap Discharge on HVDC Line's Lightning Performance

作　　者：张婷[1] 洪心 冉洪伟 张小亮 

机构地区：[1]上海工程技术大学工程实训中心,上海201620 [2]长江电力股份有限公司,湖北宜昌443133 [3]国网运行分公司上海管理处,上海201402

出　　处：《中国电力》2016年第6期107-111,共5页Electric Power

摘　　要：同塔双回直流输电线路具有节约输电走廊的优点,其空气间隙通常较小,会先于绝缘子闪络,因此同塔双回直流输电线路的耐雷性能较易受到空气间隙放电的影响。通过仿真计算,比较各种线路形式下空气间隙闪络前后输电线路雷电反击、绕击的耐雷性能,结果表明:考虑空气间隙闪络后,线路的绕击/反击耐雷水平均出现一定程度下降,雷击闪络率也随之增加。因此在对直流输电线路耐雷性能进行评估时,必须要考虑空气间隙闪络影响。HVDC double circuit transmission llne can save transmission line corridor resource. However, the small air gap between transmission line and tower leads to easy flashover instead of insulator which affects lightning performance. After simulation, lightning withstand levels in different transmission line forms with or without air gap-flashover are compared. The results show that back stroke lightning withstand level and shielding performance level are both reduced with consideration of air gap discharge, while lightning flashover rate is raised.Air gap has to be taken into consideration in evaluating HVDC lightning performance.

关 键 词：直流输电 同塔双回 空气间隙 耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]