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电网技术  2015 

特殊污秽条件下电流互感器复合绝缘外套电蚀损缺陷机理分析

DOI: 10.13335/j.1000-3673.pst.2015.10.035, PP. 2915-2922

Keywords: 互感器外套,液体硅橡胶,电蚀损,导电颗粒,模拟试验

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Abstract:

宁夏福祥变220kV电流互感器因绝缘外套严重电蚀损缺陷而退运。福祥变地区气候干燥,降雨少,雾日少,互感器外套的电蚀损现象无法用常规污闪理论模型解释。从污秽分析、材料分析、电磁场计算3个方面,对互感器复合外套电蚀损缺陷进行了分析,并且在实验室中模拟出了材料表面放电及蚀损现象,验证了原因分析的结论福祥变地区积污严重,污秽中含可导电颗粒;互感器绝缘外套硅橡胶材料憎水性良好,主要元素含量未发生明显变化;互感器护套低压端伞裙设计存在缺陷,低压端法兰与护套伞裙直接相连导致连接处液体硅橡胶材料运行场强过高诱发放电。特殊污秽条件以及伞裙设计缺陷是互感器外套缺陷的主要原因。

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