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高压电器  2014 

复合绝缘子沿面电场影响因素分析

, PP. 31-36

Keywords: 复合绝缘子,电场畸变,均压环,污秽,内部缺陷

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Abstract:

研究不同状态下的绝缘子表面电场特征对提高绝缘子可靠性具有重要意义。笔者以220kV交流复合绝缘子为例,借助于COMSOL有限元软件,对电场分布进行了计算分析,研究了均压环、表面污秽及内部缺陷对绝缘子沿面电场分布的影响。计算结果表明加装均压环可以大大降低沿面最大电场强度,有效改善表面电场不均匀程度;污秽条件下,伞群和护套交接处电场畸变严重,但畸变程度不足以引发局部放电;粘结面存在空气隙时,气隙附近电场明显畸变,护套内外存在一个较大的电场梯度,当达到一定程度时会造成护套击穿。

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