雨凇覆冰对输电线路光滑铝导线起晕电压的影响  

Influences of Glaze Icing on Corona Inception Voltage of Smooth Conductor for Transmission Lines

作　　者：蒋兴良[1] 高标[1] 张满[1] 舒立春[1] 胡建林[1] 陈吉[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》2014年第5期1290-1297,共8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：为探求雨凇覆冰形态对输电线路导线电晕起始特性的影响规律,在低温低气压人工气候试验室内完成了光滑铝导线的雨凇覆冰及覆冰后的交流电晕试验,并结合紫外成像仪技术和电流-电压(I-U)曲线拟合方法对雨凇形貌和导线起晕电压进行了测量和分析。试验结果表明:光滑导线上雨凇覆冰导致其起晕电压严重降低,且随着覆冰时间延长,导线起晕电压还将持续下降,但下降的速度呈逐渐减慢的趋势;雨凇覆冰形态并不随覆冰水电导率的不同而发生改变,但随着覆冰水电导率的增加,导线起晕电压会逐渐降低。所得结论可供雨凇频发地区的输电线路设计与选型参考。In order to investigate the influence of glaze icing form on corona onset voltage for conductors of transmission lines, we implemented a series of tests of AC corona on glaze-iced aluminum conductors in an artificial climate chamber. UV imaging technology and I-U curve fitting measurement were adopted to analyze the glaze icing morphology and onset voltage obtained in the tests. The results show that the onset voltage is decreased seriously（by 25%） by glaze icing, and it keeps getting lower before gradually becomes to be saturated as the icing time increases. Glaze icing morphology does not vary with the conductivity of freezing water, but when the conductivity rises, the corona onset voltage of glaze-iced conductor will decrease gradually. The results can be used as a reference for transmission line designs in glaze-iced areas.

关 键 词：光滑导线 雨凇覆冰 冰柱 起晕电压 覆冰水电导率 紫外成像 

分 类 号：TM852[电气工程—高电压与绝缘技术]