具有防雷功能的500kV防冰闪绝缘子结构设计及电场仿真研究  

Structure Design and Electric Field Simulation Research on 500kV Anti-icing Flash Insulator with Lightning Protection Function

作　　者：吴伟 蒋正龙 陆佳政 方针 胡建平 王博闻 

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

出　　处：《高压电器》2018年第1期9-15,共7页High Voltage Apparatus

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,严重威胁电网的稳定运行。文中将避雷器和绝缘子结合,通过绝缘段雷电冲击和工频闪络试验,设计出一种新的500kV防冰防雷复合绝缘子,并利用有限元法对该500kV防冰防雷复合绝缘子电场分布进行仿真计算,研究了清洁和覆冰工况。结果表明:局部高场强区域集中在高压段、绝缘段和避雷段交界处,最大场强为18.1kV/cm,满足现场运行要求;结合间隙雷电冲击试验,采用带1.8 m均压环间隙的绝缘段和避雷器串联具有较好的防雷保护效果。Lightning and ice-coating are two natural disasters faced by transmission hne, serious threat to the stable operation of power grid. Combined arrester with insulation, the paper design a kind of 500 kV lightning and icing protection composite insulator with the method of lightning impulse and AC flashover test; in addition, the electrical field analyzes on 500 kV lightning and icing protection composite insulator is made by finite element method. The study on clean and icing conditions found that the local high field strength region focus on high voltage section as well as the junction between insulation section and lightning protection section; meanwhile, the maximum field strength is 18.1 kV/cm, which meet the requirements of the field operation. By means of gap lightning impulse tests, it can obtain a better lightning protection effect when an insulation segment with 1.8 meters corona ring gap is in series with arrester.

关 键 词：绝缘子 防冰防雷 场强计算 电弧自熄 有限元法 

分 类 号：TM216[一般工业技术—材料科学与工程]