低气压下三种覆冰支柱绝缘子直流闪络特性研究

根据人工气候试验室内三种支柱绝缘子的人工覆冰直流闪络试验结果，分析了低气压下覆冰对支柱绝缘子直流闪络特性的影响。结果表明：不同伞裙结构对重冰条件下的三种支柱绝缘子的直流闪络电压影响不明显，但对临界闪络电流的影响较大；低气压下，三种支柱绝缘子的闪络电压和临界闪络电流下降明显；三种绝缘子覆冰闪络的极性效应不明显。

STUDY ON DC FLASHOVER PERFORMANCE OF THREE TYPES OF ICED POST INSULATORS AT LOWER ATMOSPHERIC PRESUURE

Based on the DC flashover test results of three types of iced post insulators at lower atmospheric pressure in the artificial climate chamber, this paper analyzes the effect of ice on the DC flashover performance of iced post insulators. The influence of the contours and sizes of sheds on the flashover voltages and the critical flashover currents at severely icing condition is obtained. There is an obvious degradation of the flashover voltages and the critical flashover currents at lower air pressure. And it is found that the polarity effect is not obvious.