污湿环境下复合绝缘子电场分布的研究  

A Study of Electric Fields Around Composite Insulators under Polluted and Wet Conditions

作　　者：张海兵[1] 田甜 文旭[3] 

机构地区：[1]重庆市电力公司检修分公司,重庆401554 [2]重庆电力设计院,重庆401121 [3]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《广东工业大学学报》2012年第2期58-62,共5页Journal of Guangdong University of Technology

基　　金：教育部高等学校博士点专项科研基金资助项目(20090191120019);国家电网公司科技项目(渝电KJ(2010)419)

摘　　要：研究污秽潮湿状态下复合绝缘子表面电场特性可有效地提高复合绝缘子运行的可靠性.综合考虑了复合绝缘子的污秽层厚度以及均匀性,在Comsol Multiphysics软件环境中建立了110 kV线路复合绝缘子的二维电场仿真模型,采用有限元法计算了复合绝缘子在不同污湿状态下的电位和电场分布.研究结果表明,当复合绝缘子表面形成均匀水膜润湿污秽层后,对绝缘子电场分布的影响程度与污层电导率有关,当污层电导率增大到10-7S后,复合绝缘子高压端附近伞群承受的电场强度明显增强;当复合绝缘子表面有水滴滴落时,水滴周围的电场急剧增强.Electric-field characteristics of composite insulators under polluted and wet conditions can ef- fectively reduce the risk of composite insulator flashover. The surface thickness and uniformity of compos- ite insulators were researched, and the simulation model for two-dimensional electric fields of 110 kV composite insulators was established via the software Comsol Muhiphysics. The finite element method was applied to calculate the potential and field distribution for 110 kV under polluted and wet conditions. The research shows that the effect of uniform water is related with pollution layer conductivity, and that the umbrella group of the composite insulator near the high voltage supports higher voltage if pollution layer conductivity increases to 10-7 S. When there are drops dripping on the surface of the composite insulator, the electric field intensity surrounding the drops grows rapidly.

关 键 词：污湿环境 复合绝缘子 污层电导率 电场强度 电位分布 

分 类 号：TM852[电气工程—高电压与绝缘技术]