带电雨凇下瓦型及传统导线起始电晕电压对比

Comparative Analysis of Corona Onset Voltage Between T-Type and Ordinary Conductor After Energized Glaze Icing

本文在人工气候试验室内对直径18mm的JNRLH60X/LBIA-185/30和直径为28.14mm的Drake1020瓦型导线、直径18mm的LGJ-185/10和28mm的LGJ-400/65普通绞线在不同覆冰条件下进行带电雨凇覆冰,再施加交流电压并采用紫外成像技术及曲线拟合法对导线起晕电压进行测量,根据雨凇冰柱形态建立有限元模型进行最大场强计算,得到雨凇覆冰下瓦型导线的起晕电压特性。结果表明:带电雨凇覆冰会导致瓦型导线起晕电压值降低约63%;覆冰程度的增加会使得瓦型导线起晕电压持续下降但逐渐趋于饱和;雨凇形态不随覆冰水电导率的不同而发生改变,但覆冰水电导率的增加会使得导线起晕电压持续下降;同等条件雨凇覆冰情况下,普通绞线比瓦型导线的起晕电压低。

In the paper, the multifunction artificial climate chamber in different condition is used to make glaze icing for four conductors--JNRLH60X/LBIA-185/30, Drake 1020, LGJ-185/10, LGJ-400/65. The UV imaging technology and 1-U curve fitting measurement is used to analyze corona inception voltage, and combined with the glaze icing morphology to establish icing branches＇electrical field model to research the corona characteristics of the conductor. The results show that energized glaze icing can cut down the inception voltage value of T-type wire about 63%, corona onset voltage will decrease continually with the icing time increasing, but it will gradually become saturated. Glaze icing morphology dose not vary with the difference of the freezing-water conductivity, but with the increase of the salt concentration, the conductor corona starting voltage will decrease gradually. Under the same icing conditions, the ordinary conductor＇s corona inception voltage is lower than T-type conductor.