覆冰圆柱绝缘子起弧前电位与电场分布研究  

Study on Potential and Electric Field Distributions Along a Cylindrical Insulator Covered With Ice Before Arc Inception

作　　者：舒立春[1] 张仕焜[2] 蒋兴良[1] 胡琴[1] 汪诗经[1] 袁伟[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]重庆市电力公司南岸供电局,重庆市南岸区400060

出　　处：《中国电机工程学报》2012年第31期106-113,225,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2009CB724502)~~

摘　　要：绝缘子覆冰闪络之所以比污秽闪络过程复杂,不仅在于电弧发展过程中放电路径不唯一,而且往往与覆冰水电导率、覆冰形态等因素有关,因此该文在人工气候室对覆冰光滑圆柱绝缘子进行了交流闪络特性试验,着重从电场的角度研究覆冰水电导率与无冰带对绝缘子起弧前沿面电位、电场分布的影响。试验和计算结果表明:无冰带长度与绝缘子闪络电压成线性关系;无冰带的位置对闪络电压和沿面最大电场强度有较大的影响;覆冰水电导率越高闪络电压越低,同时电位、电场畸变越明显;较高相对介电常数的冰体、较高电导率的融冰水膜和无冰带的存在,是使绝缘子沿面电位、电场分布发生变化,进而一定条件下导致起弧的重要因素。The flashover process of ice-covered insulators is more complex than that of polluted insulators, which is due to not only the two different discharge paths, on the ice surface or inside the ice, but also such factors as ambient temperature, applied water conductivity, water film thickness and ice distribution. Therefore the effects of applied water conductivity and ice free zone on potential and electric field distributions before arc inception were studied based on a series of AC flashover experiments in the artificial climate chamber. Both experimental and calculated results indicate that insulator＇s flashover voltage is linearly correlated with the length of ice free zone; flashover voltage and distribution of the maximum electric field strength are influenced by the position of ice free zone; as applied water conductivity rises, flashover voltage declines, and simultaneously the distortions of potential and electric field are more serious; the high permittivity of ice, a highly conductive water film and the presence of ice free zone are key factors to change the potential and electric field distributions along a cylindrical insulator, which may give rise to the formation and propagation of arc.

关 键 词：圆柱形绝缘子 覆冰 无冰带 覆冰水电导率 电 位 电场分布 有限元 

分 类 号：TM85[电气工程—高电压与绝缘技术]