中文摘要：

输电线路带电水冲洗是电力系统防污闪的主要措施之一。500 k V输电线路4联污秽绝缘子串具有间距小、污秽重、难以清洗等特点,为实现其带电水冲洗,在武汉大学户外带电水冲洗试验场进行了冲洗试验,比较了4个污秽度等级下1冲4回和1冲6回这2种冲洗方法。结果表明：冲洗过程中在较长冲洗时间段泄漏电流幅值都〈10 m A;冲洗到绝缘子串上部3/4及5/6位置附近处时出现了泄漏电流突增现象;冲洗泄漏电流基波幅值最大值、结束时刻泄漏电流基波幅值随污秽度等级增大而增大。4种污秽度等级下,1冲4回和1冲6回冲洗过程中泄漏电流基波幅值最大值分别小于61 m A和31 m A,这2种方法用于500 k V输电线路4联污秽绝缘子串的带电水冲洗都是安全的。

英文摘要：

Hot washing is one of key measures against pollution flashover in power systems. Some characteristics of quadruple polluted insulator string on 500 k V transmission lines, including small distance between strings, heavy contamination, and certain shapes, make it difficult to hot wash the strings. To realize the hot washing of quadruple polluted insulator strings, we conducted experiments in the 500 k V outdoor test site in Wuhan University, and compared two methods namely the four-cycle hot washing method and the six-cycle hot washing method at four different contamination degrees. The leakage current（LC） was less than 10 m A during washing process for most of the length of string, though there was a sudden rise of LC when hot washing proceeded to the position near 3/4 or 5/6 of the insulator string. Meanwhile, the maximum LC amplitude, the amplitude of LC＇s fundamental waveform at the end of hot washing for of LC both increased with contamination degree. For all four contamination degrees, the maximum amplitudes of fundamental waveform were less than 61 m A and 31 m A for the four-cycle method and the six-cycle method. This indicates that both methods are safe for the hot washing of quadruple polluted insulator strings on 500 k V transmission lines.