摘要
为向国内高海拔地区特高压直流换流站外绝缘的设计提供参考,在1970m实际高海拔条件下,以不同伞裙结构的5种复合支柱绝缘子和2种瓷支柱绝缘子为试品(染污采用固体污层法),采用恒压升降法,系统研究了伞裙结构和淋雨情况(淋雨量和雨水电导率)对复合支柱绝缘子污雨闪电压的影响。试验结果表明:伞间距对伞裙间污水柱的桥接现象影响较大,使得污雨闪电压差别较大;伞伸出增大会加大爬电距离,污雨闪电压升高;淋雨量、雨水电导率大小对支柱绝缘子的污雨闪电压影响也较大,且均符合幂函数关系。
This paper presents the experimental results of five types of composite post insulators and two types of porcelain post insulators with different shed designs in natural high-altitude areas （1 970 m）, on wet flashover. The solid layer method was used in experiments and 50% wet flashover voltages （U50%） were determined by using the Up-and-Down Method with negative voltage. Experimental results indicated that shed spacing had a significant influence on the contaminated water column between every two sheds, so the wet flashover voltage differed greatly with different shed design. When the shed overhang increased, the leakage distance of the post insulator enlarged. The wet flashover voltage with large shed overhang was higher than that with small shed overhang. The precipitation and the water conductivity also had great effects on the wet flashover voltage. The relationship between the wet flashover voltage and the precipitation or the water conductivity was congruous with the power function relation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第1期14-19,共6页
Proceedings of the CSEE
基金
"十一五"国家科技支撑计划重大项目(2006BAA-02A19)~~
关键词
高海拔
直流换流站
支柱绝缘子
污雨闪特性
复合绝缘子
high altitude
DC converter station
post insulator
wet flashover characteristic
composite insulator
