Flashover Characteristics of 110 kV Snow-covered Post Insulators

被引：0

作者：

Mei H. ^{[1
]}

Shi Q. ^{[1
]}

Lu M. ^{[2
]}

Wang L. ^{[1
]}

Liu Z. ^{[2
]}

Zhang C. ^{[3
]}

机构：

[1] Graduate School at Shenzhen, Tsinghua University, Shenzhen

[2] Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou

[3] School of Information Engineering, China University of Geosciences (Beijing), Beijing

来源：

Gaodianya Jishu/High Voltage Engineering | 2018年 / 44卷 / 12期

关键词：

ESDD; Post insulators; Shed geometry; Snow flashover; Snow thickness;

D O I：

10.13336/j.1003-6520.hve.20181126022

中图分类号：

学科分类号：

摘要：

Under the condition of snow, the electrical performance of polluted insulators will decrease obviously, even causing snow flashover. To study the effect of equal salt deposit density (ESDD), snow thickness and shed geometry on the snow flashover voltage, we designed a test method of artificial snow covering, performed artificial contamination snow flashover tests of 4 kinds of 110 kV AC post insulators with different shed geometry, and analyzed the process of flashover. Research shows that conductivity of snow melting water per unit time will decrease in a snow melting progress. Arc discharge and flashover path often occurs where snow melts or falls off. The snow flashover voltage has a negative power function with ESDD, decreases and tends to saturation with the increase of ESDD. Compared that at snow thickness of 5 mm, 10 mm and 15 mm, the lower snow flashover voltage is lower at the snow thickness of 10 mm. Post insulators with large umbrella spacing and edge have higher snow flashover voltage gradient, and can more effectively prevent the snow flashover. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：3944 / 3950

页数：6

共 21 条

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