Abstract Icing of insulators in transmission line will seriously affect its electrical performance and endanger the operation safety. DC transmission has the advantages of low cost, low power loss during operation, saving line corridor and the ability to connect two AC power networks, and so on. It is suitable for large capacity and long distance transmission, and promotes the power transmission pattern of “power transmission from west to east” and “power transmission from north to south” in China. In this paper, the natural icing DC ice flashover test was carried out at the natural icing test base of Xuefeng Mountain, Chongqing University. The results show that under the condition of natural icing, the DC ice flashover voltage varies with the pollution ice parameter ISP in a negative power function. Under natural conditions, the DC ice flashover tests of LXY-160, XWP-210 and FXBW-220/100 insulators show that the minimum flashover voltage gradient of dry arc is affected by both creeping distance and dry arc distance of insulators, and the external insulation effect of XWP-210 insulator is the best in the area covered with ice and pollution. In addition, the artificial icing experiment was carried out in the multi-function artificial climate room of Chongqing University. After the air pressure conversion of the experimental results, compared with the natural icing results, it is known that the DC ice flash voltage of natural icing is higher and the dispersion is greater than that of artificial icing. The test results can provide a reference for the external insulation design of EHV DC transmission lines.
Jiang Xingliang,Zou Jiayu,Han Xingbo等. DC Flashover Characteristics of Natural Environment Insulators Covered with Ice[J]. Transactions of China Electrotechnical Society, 2020, 35(12): 2662-2671.
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2020, Vol. 35 
