Negative DC Flashover Performance of Post Insulators with Non-uniform Pollution on Top and Bottom Surfaces

被引：0
|
作者：
Zhang Z. [1 ]
Li X. [1 ]
Qiao X. [1 ]
Jiang X. [1 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing
来源：
Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 10期
基金：
国家重点研发计划;
关键词：
DC; Flashover voltage; Non-uniform pollution; Post insulator; Surface conductivity;
D O I：
10.13336/j.1003-6520.hve.20190700
中图分类号：
学科分类号：
摘要：
Porcelain post insulators have been widely used in DC converter stations. Recent studies have shown that the pollution of the top surface is heavier than that of the bottom surface. The ZSW56-126/8 insulator was artificially contaminated to study the DC flashover characteristics under the non-uniform pollution, and the flashover voltage under each non-uniformity was obtained. The relationship between the flashover voltage and the salt density was fitted by the least squares method, and the DC flashover characteristics of the non-uniform pollution were obtained. Furthermore, the influence of non-uniform pollution on the surface conductivity of the insulator was analyzed, and the equivalent conductivity was obtained as a function of the non-uniformity. Based on the equivalent conductivity function, the theoretical expression of the non-uniform pollution flashover voltage correction coefficient was derived and verified, providing a theoretical basis for the non-uniform pollution flashover voltage variation. Meanwhile, the empirical formula of the correction coefficient was analyzed, and the expression of the flashover voltage with the correction coefficient was obtained and verified by error calculation. It can concluded that the empirical formula of DC flashover voltage Uf and salt density pSDD can be obtained as: Uf=apSDD-b, when the upper and lower surfaces of the insulator are unevenly polluted. The coefficient a is positively correlated with the inhomogeneity, the a increases with the increase of the inhomogeneity, and the index b value is not affected by the inhomogeneity. Non-uniform pollution on the upper and lower surfaces of the pillar insulators will affect the conductivity of the surface fouling layer and then the flashover voltage. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3569 / 3575
页数：6
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