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棒形悬式复合绝缘子内部缺陷对电场分布的影响

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Keywords: 棒形悬式复合绝缘子,断裂,内部缺陷,电场分布,局部放电

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Abstract:

为了对棒形悬式复合绝缘子断裂事故原因进行分析,借助于有限元软件,建立了220kV复合绝缘子几何模型,对有内部缺陷存在时电场分布特性进行仿真分析。结果表明,气隙周围局部电场增大,且护套内外表面畸变程度不同,存在一个场强梯度,易引起护套击穿;随着气隙长度的增加,电场畸变程度有减弱趋势;水气渗入气隙后,绝缘子护套内外表面电场均减小,但仍存在较大场强差值。电场畸变严重将引起局部放电,若进一步发展会沿电场方向造成碳化通道,加上腐蚀性气体的影响,绝缘子机械性能会大大降低,易引起断裂。

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