高电压技术2017，Vol.43Issue(9)：2943-2950,8.DOI:10.13336/j.1003-6520.hve.20170831023
基于泄漏电流特性的交流悬式绝缘子覆冰闪络特性
AC Suspension Insulator's Ice Flashover Based on Characteristics of Leakage Current
摘要
Abstract
In order to clarify the features of the pre-flashover and predict ice flashover more accurately,the entire evolution of leakage current during the pre-flashover process of both AC long and short suspension insulator strings covered with ice was recorded and analyzed.The tests were carried out in two separate climate chambers,and showed that the pre-flashover processes of both ice-covered long and short insulator strings could be divided into four stages based on the time domain characteristics of leakage current.Two significant parameters were proposed as characteristic parameters for the analysis of pre-flashover characteristics,namely the characteristic current (Iw) which was the quasi-constant value in stage Ⅲ,and the critical current (IFT) which was the leakage current amplitude value in the last cycle before flashover in stage Ⅳ.The relationships between these two characteristic parameters and the influencing factors including ice build-up severity,the contamination degree,and the conductivity of the freezing water were also studied.It was found that Iw and IFr increased with the conductivity of the freezing water almost linearly,but they were barely influenced by the contamination level.And the two parameters increased with the ice build-up severity,finally reaching a saturated level when the air gaps amid the insulator sheds were completely bridged by icicles.It was believed that the characteristic parameter Iw could be adopted as early-warning value of pre-flashover along the ice-covered suspension insulator,and IFT as the criterion of the critical flashover.关键词
绝缘子闪络/覆冰/污秽/电弧长度/泄漏电流/冰棱桥接Key words
insulators flashover/icing/contamination/arc length/leakage current/ice bridging引用本文复制引用
于昕哲,杨晓磊,唐其筠,张乔根,杨昊,李舟..基于泄漏电流特性的交流悬式绝缘子覆冰闪络特性[J].高电压技术,2017,43(9):2943-2950,8.基金项目
国家电网公司科技项目(GY71-13-034).Project supported by Science and Technology Project of SGCC(GY71-13-034). （GY71-13-034）
