500kV输电线路4联污秽绝缘子串带电水冲洗

发布时间：2019-04-26 08:51

【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。
[Abstract]:Live water flushing of transmission line is one of the main measures to prevent pollution flashover in power system. In order to realize live water flushing of 500 kV transmission line, 4-connection pollution insulator string has the characteristics of small spacing, heavy pollution and difficult to clean, etc. The flushing test was carried out in the outdoor electrified water flushing test ground of Wuhan University. The two methods of flushing were compared under four levels of pollution: 1 stroke 4 times and 1 wash 6 times. The results show that the leakage current amplitude is 10 Ma in the longer flushing time, and the leakage current increases abruptly when flushing to the positions of 3 / 4 and 5 / 6 in the upper part of the insulator string. At the end of the time, the fundamental amplitude of the leakage current increases with the increase of the pollution level. Under 4 kinds of pollution levels, the fundamental amplitude of the flushing leakage current increases with the increase of the pollution level. The maximum fundamental amplitudes of leakage current are less than 61 Ma and 31 Ma respectively during 1 flushing 4 cycles and 1 flush 6 flushing, respectively. These two methods are safe for flushing with charged water in 4 pollution insulator strings of 500 kV transmission line. The maximum values of leakage current fundamental amplitudes are less than 61 Ma and 31 Ma respectively in the process of 1 flushing and 6 flushing.
【作者单位】：武汉大学电气工程学院;广东电网公司;国网湖北省电力公司;
【基金】：国家自然科学基金(51477123) 中国南方电网有限责任公司科技项目(K-GD2012-147)~~
【分类号】：TM75

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