500 kV防冰防雷复合绝缘子防雷特性仿真研究  

Simulation Study of Lightning Protection Performance of 500 kV Anti-Icing and Anti-Thunder Composite Insulator

作　　者：王博闻[1] 蒋正龙[1] 陆佳政[1] 胡建平[1] 吴伟[1] 方针[1] 

机构地区：[1]电网输变电设备防灾减灾国家重点实验室(国网湖南省电力公司防灾减灾中心),湖南省长沙市410129

出　　处：《电网技术》2017年第7期2393-2400,共8页Power System Technology

基　　金：国家电网公司科技项目(5216A015001N)~~

摘　　要：雷击和覆冰是输电线路面临的两大自然灾害,将避雷器和绝缘子结合设计了一种500 k V防冰防雷复合绝缘子。设计采用外径86 mm、内径26 mm、高度22 mm氧化锌电阻片,对冲击电流下电阻片的吸收能量进行了数值研究。建立了电磁暂态仿真模型,分别对-32 k A绕击和-300 k A反击雷电流下的防冰防雷复合绝缘子的通流、能量、残压进行分析,结果表明防冰防雷复合绝缘子防雷段的耐受能量和残压满足标准和线路运行要求。仿真分析了不同幅值工频相电压和差异化接地电阻对于防冰防雷复合绝缘子防雷特性的影响,得到了不同影响因素下其防雷性能变化规律。基于数值计算和仿真分析,文中所设计的防冰防雷复合绝缘子,在通过幅值为100 kA的4/10μs波形脉冲电流测试情况下,500 kV线路运行时最大耐受的绕击雷电流幅值为-59 k A。Lightning and icing are two natural disasters adversely affecting transmission lines. In this paper, anti-icing and anti-lightning composite insulator applied to 500 k V transmission line, combining functions of arrester and insulator, is developed. Under different current waveforms, numerical calculation analysis is carried out for absorbed energy of Zn O varistor with 86 mm outer diameter, 26 mm inner diameter and 22 mm height. Based on electromagnetic transient simulation analysis, current, energy and residual voltage of the composite insulator are obtained under-32 k A lightning shielding failure and-300 k A counter-attack. Analysis results indicate that the composite insulator could meet requirements of national standard and operation conditions. Effects of phase voltage value at power frequency and grounding resistance are analyzed. Variation tendency of lighting protection characteristics under different conditions are obtained. According to numerical calculation and simulation analysis, lightning shielding failure withstand level of the composite insulator is-59 k A for 100 k A 4/10 μs surge current test.

关 键 词：防冰防雷复合绝缘子 PSCAD计算 雷电流 通流能量 脉冲电流 

分 类 号：TM85[电气工程—高电压与绝缘技术]