摘要
严重覆冰时采用大小伞结构的复合绝缘子依然出现冰凌桥接现象。为防止出现冰凌桥接和覆冰闪络,开展超大伞裙结构复合绝缘子的覆冰特性研究有着重要意义。建立220 k V的超大伞裙结构复合绝缘子二维轴对称模型,并采用准静态场有限像元法进行仿真分析,对比采用不同数量的超大伞裙绝缘子在清洁和覆有干、湿冰时绝缘子的电位、电场分布。发现清洁时,超大伞裙对电位、电场分布不产生影响,在覆有干、湿冰时,超大伞裙提供的多个空气间隙,能有效改善绝缘子的电位、电场分布,特别是靠近高压端的第1个伞裙采用超大伞裙结构能改善高压端电位分布。最后结合仿真数据提出了优化后的超大伞裙结构的复合绝缘子。
Composite insulators with large and small sheds will still be completely bridged under heavy ice conditions. To prevent icing bridge and icing flashover, it makes sense to study on composite insulators with extra large sheds. In this paper, two-dimensional axial symmetric model of composite insulators in 220 k V transmission line is established and simulated with quasi-static field finite element method. Distributions of potential and electrical field of composite insulators with different extra large sheds are compared when they are clean, under dry or wet ice. It turns out that the extra large sheds has no effect on distribution of potential and electrical field when the composite insulators are clean. When the composite insulators are covered with dry or wet ice, the air gap produced by extra large sheds can improve the distribution of potential and electrical field. Especially, the extra large shed near the high voltage terminal effectively improves the potential distribution in high voltage terminal. In this paper, the optimized composite insulator with extra large sheds is put forward with numerical simulation.
出处
《电网技术》
EI
CSCD
北大核心
2015年第7期2064-2068,共5页
Power System Technology
基金
国家电网公司科技项目(5216A5120003)~~
关键词
超大伞裙
重覆冰
电位电场分布
有限像元法
数值仿真
extra large shed
heavy icing condition
potential and electric field distribution
finite element method
numerical simulation
