电网技术2017，Vol.41Issue(11)：3691-3697,7.DOI:10.13335/j.1000-3673.pst.2017.0034
不同覆冰类型绝缘子串的泄漏电流特征分析
Characteristic Analysis of Leakage Current of Insulator Strings Under Different Icing Types
摘要
Abstract
Leakage current analysis on insulator is an important method for early-warning of icing flashover. Characteristics of insulator leakage current are affected by both icing type and characteristics of insulator string. This paper presented artificial icing on glass insulators in research of trend of leakage current and change rule of ice resistance in icing and melting stages of glaze, hard rime and soft rime. With FFT analysis, harmonic components and distribution of resistive and capacitive components of leakage current in different stages of icing and melting were studied. Icing state judgment factor was defined for quantitative evaluation of insulator icing state. Results showed that leakage current in icing period did not change significantly. However, it increased rapidly in initial period of melting process, and kept flat or rose slightly in middle and final periods of melting. Icing type had little effect on ice resistance in icing period. In melting period, resistance of hard rime and soft rime was lower than that of glaze. The main component of ice-covered insulators' leakage current was fundamental component. When relative value between fundamental resistive and fundamental capacitive components to total fundamental current is different, the icing state on the insulator is different, thus helping to judge the icing state on the insulator and make early-warning of flashover.关键词
泄漏电流/绝缘子/覆冰类型/阻容分量/闪络预警Key words
leakage current/insulator/icing type/resistive and capacitive components/early-warning of flashover分类
信息技术与安全科学引用本文复制引用
李亚伟,张星海,贾志东,周朋,孙磊,柳顺楠..不同覆冰类型绝缘子串的泄漏电流特征分析[J].电网技术,2017,41(11):3691-3697,7.基金项目
中国博士后科学基金面上资助(2014M562506XB). The China Postdoctoral Science Foundation Grant (2014M562506XB). （2014M562506XB）
