覆冰圆柱形绝缘子的交流闪络特性与放电过程  

AC Flashover Performance and Discharge Process of a Cylindrical Insulator Covered with Ice

作　　者：舒立春[1] 张仕焜[1] 蒋兴良[1] 胡琴[1] 尚宇[1] 邱宗奎[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2011年第7期1569-1575,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724502;2009CB724501);国家重点实验室项目(2007DA10512708101;2007DA10512708102)~~

摘　　要：绝缘子覆冰闪络事故仍然严重威胁着电力系统的安全稳定运行,尽管国内外的电力科学研究者对此开展了大量广泛的研究工作,但是在覆冰闪络特性和机理方面依然未能达成统一认识。为对其进行深入探讨,在人工气候室内对圆柱形绝缘子物理模型进行了交流覆冰闪络试验,同时利用摄像仪记录了覆冰绝缘子的整个闪络过程,分析研究了局部电弧的起始位置和可能发展的形式。试验结果表明:无冰带的位置对闪络电压有较大的影响,覆冰水电导率越高闪络电压越低;较高电导率的融冰水膜和无冰带的存在,是使绝缘子沿面电位分布发生变化,从而可能导致电弧起弧和发展延伸形式有所不同的重要影响因素;在电弧的不同发展阶段,内部和外部电弧的速度和燃烧状态也有所差异。A series of AC flashover experiments based on a cylindrical insulator model are performed in the artificial climate chamber. The whole discharge process of ice-covered insulator is recorded by the camera technique at the same time, for the purpose of analyzing the formation and possible propagation of the arc. Experimental results indicate that flashover voltage is influenced by the position of ice free zone; as applied water conductivity rises, flashover voltage declines; the highly conductive water film and the presence of ice free zone are key factors to change the potential distribution along the cylindrical insulator, which can lead to the different initial position of partial arc and the different discharge path; during various stage of the arc development, the propagation velocities and states of outer and inner arcs are also different

关 键 词：圆柱形绝缘子 覆冰 无冰带 覆冰水电导率 交流闪络特性 放电过程 

分 类 号：TM855[电气工程—高电压与绝缘技术]