交流500kV复合绝缘子断裂原因分析

发布时间：2018-01-11 17:26

本文关键词：交流500kV复合绝缘子断裂原因分析　出处：《绝缘材料》2014年06期 　论文类型：期刊论文

【摘要】：通过对某交流500 k V复合绝缘子断裂情况进行分析,认为由电场畸变引起的局部放电是促使绝缘子断裂的原因。利用有限元软件ANSYS建立500 k V复合绝缘子几何模型,对其电场分布特性进行仿真计算。结果表明:绝缘子断裂位置位于高压端附近的场强极大值处,当此处护套芯棒界面存在气隙缺陷时,护套内外局部电场均出现不同程度的增大,且内外场强存在较大差值易造成护套击穿。电场不均匀引起的局部放电进一步会沿电场方向形成碳化通道,在水气及酸性物质的影响下,绝缘子力学性能会极大降低,严重时导致绝缘子断裂。
[Abstract]:The fracture of a 500 kV AC composite insulator is analyzed. The partial discharge caused by electric field distortion is considered to be the cause of insulator fracture. The geometrical model of 500kV composite insulator is established by using finite element software ANSYS. The simulation results show that the fault location of insulator is located at the maximum of field strength near the high voltage end, when there is air gap defect in the interface of sheath mandrel. The local electric field inside and outside the sheath increases to some extent, and the difference between the internal and external electric field intensity can easily lead to the sheath breakdown. The partial discharge caused by the non-uniform electric field will further form a carbonization channel along the electric field direction. Under the influence of water and acid, the mechanical properties of insulators will be greatly reduced, which will lead to the breakage of insulators.
【作者单位】：河南职业技术学院;河南省电力公司驻马店供电公司;
【分类号】：TM216
【正文快照】： 0引言复合绝缘子以其体积小、绝缘强度高、耐污闪性能好等优点近年来得到广泛应用,尤其是在污秽地区。然而随着运行年限的增加,加上各种外部环境因素的影响,运行线路上复合绝缘子会发生电蚀脆断、掉串等恶性事故,严重影响输电线路的安全运行。据统计数据显示,在绝缘子损坏事故

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