高电压技术2018，Vol.44Issue(6)：1806-1813,8.DOI:10.13336/j.1003-6520.hve.20180529011
SF6气体绝缘直流穿墙套管污秽闪络特性
Pollution Flashover Performances of SF6 Insulated DC Wall Bushing
摘要
Abstract
In order to study the pollution flashover performances of DC wall bushing under different pollution conditions, the influences of different composite umbrella structures on the flashover characteristics of DC wall bushing, and the influences of the internal conductor and shielding structure of the wall bushing on pollution flashover characteristics of composite coat, we carried out artificial pollution tests of ±400 kV SF6 insulated DC wall bushing with composite insulator as its coat in the large artificial climate laboratory, and obtained the negative power index relation between the 50％ withstand voltage (U50) and salt deposit density (SDD) of different composite umbrella structures of wall bushing. The research demonstrates that the flashover voltage value of unit creepage distance of the wall bushing composite insulator with one big/one small umbrella structure is higher than that with one big/two small umbrella structure. The results are also obtained when the SDD is 0.08, 0.15, and 0.20 mg/cm2, the 50％ withstand voltage (U50) of the DC wall bushing with internal conductor and shielding structure is improved by 5.3％, 4.2％, and 5.3％ than the DC hollow composite insulator without internal conductor and shielding structure. According to the research results, we suggest that the umbrella structure with a higher utilization ratio of creepage distance can be employed in the appropriate external umbrella structure design of ±1 100 kV UHV DC wall bushing, and the creepage distance is not less than 48 mm/kV.关键词
直流/穿墙套管/污秽闪络特性/伞形结构/爬电比距Key words
DC/wall bushing/pollution flashover performance/umbrella structure/creepage distance引用本文复制引用
谢雄杰,刘琴,许佐明,徐涛,胡伟,邓宏伟..SF6气体绝缘直流穿墙套管污秽闪络特性[J].高电压技术,2018,44(6):1806-1813,8.基金项目
国家高技术研究发展计划(863 计划)(2014AA051804) （863 计划）
国家电网公司科技项目(GY71-14-033). Project supported by National High-tech Research and Development Program of China(863 Program)(2014AA051804), Science and Technology Project of SGCC(GY71-14-033). （GY71-14-033）
