绞线带电雾凇覆冰后的电晕起始特性  

Corona Onset Characteristics of Stranded Conductor after Energized Rime Icing

作　　者：陈吉[1] 蒋兴良[1] 舒立春[1] 张志劲[1] 王尧玄[1] 郭裕钧 

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》2014年第6期1738-1747,共10页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724501;2009CB724502)~~

摘　　要：为深入研究不同雾凇冰树枝形态对覆冰导线表面电场分布及其电晕起始特性的影响规律,在多功能人工气候实验室中,使用4种导线进行了不同电场下雾凇带电覆冰后的起晕电压试验。结合紫外成像仪和曲线拟合法对覆冰导线的起晕电压进行研究,根据雾凇形态建立了冰树枝尖端的电场分布模型,利用Ansoft有限元软件进行了仿真计算。研究结果表明:雾凇覆冰后,导线起晕电压会明显下降;冰树枝形态的不同会导致起晕电压出现波动趋势;相同覆冰时间内,覆冰对粗导线的影响较小;覆冰厚度的增加会增大导线等效直径从而升高起晕电压,但升高速度逐渐减慢;冰水电导率对雾凇形态及起晕电压没有影响;雾凇冰树枝会增大导线粗糙度从而使导线电场分布发生畸变。研究结论可为研究覆冰导线的起晕特性提供理论参考。To further understand how the rime ice trees of different forms affect the surface electric field and the corona onset characteristics of iced conductors, using four kinds of conductors, we tested their corona onset voltages under rime-iced condition and different electric fields in an artificial climate chamber. In the tests, we used an ultraviolet imager and the curve-fitting method to study the corona onset voltages of the conductors. Moreover, using the finite element method（FEM） software, Ansoft, we modeled and calculated the electric field distribution around the rime ice-tree tips according to different rime forms. The results show that, the rime icing significantly decreases the corona onset voltage of a conductor. However, the corona onset voltage may fluctuate with various ice-tree shapes. In the same iced period, the thicker wires are affected less by the rime than the thinner ones. The increase in diameter of a conductor due to the icing will raise the corona onset voltage of the conductor at a gradually slowing speed. The icing-water conductivity does not influence the rime morphology and the corona onset voltage. The branches rime ice will increase the conductor roughness and consequently distort the electric field of the conductor. The results can be used as a reference for studying the corona onset characteristics of transmission line in the icing areas.

关 键 词：绞线 带电覆冰 雾凇 起晕电压 电导率 紫外成像 

分 类 号：TM752[电气工程—电力系统及自动化]