Flashover Performance and Process of Suspension Insulator Strings Artificially Covered with Snow

Yuyao Hu, Sihua Guo, Richang Xian, Xingbo Han, Zhongyi Yang and Ying Wu
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Yuyao Hu: College of Electrical and Electronic Engineering, Shandong University of Technology, Zhangdian District, Zibo 255000, China
Sihua Guo: State Grid Chongqing Electric Power Company Electric Power Research Institute, Chongqing 400015, China
Richang Xian: College of Electrical and Electronic Engineering, Shandong University of Technology, Zhangdian District, Zibo 255000, China
Xingbo Han: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
Zhongyi Yang: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
Ying Wu: State Grid Weifang Hanting Electric Power Company, Hanting District, Weifang 261100, China

Energies, 2018, vol. 11, issue 11, 1-14

Abstract: Snow accumulates on the surface of insulator string, causing a decrease in its electrical performance, seriously threatening the reliable operation of the power grid. Most previous studies have focused on iced insulators; however, there is a lack of research on snow-covered insulators. In this paper, to reveal the influencing mechanism that snow has on the electrical characteristics of insulator string, based on an artificial snowing test in a chamber, the effects of equivalent salt deposit density, applied voltage type, and snow thickness on the flashover performance of snow-covered insulators are analyzed, and the flashover process is investigated. The results show that the relationship between the arc flashover gradient and the equivalent salt deposit density is a power function with a negative exponent, which is similar to that of polluted and ice-covered insulator strings. For the insulator strings with the same snow accretion, the direct current (DC) arc flashover gradient is lower than the alternating current (AC) arc flashover gradient. The relationship between arc flashover gradient and snow thickness is also a power function. The formation of a dry band during the flashover of snow-covered insulator string is similar to the flashover of the polluted insulator, and the arc propagation along the surface of the snow-covered insulator is similar to the flashover of the iced insulator.

Keywords: flashover performance; insulator string; snow; arc flashover gradient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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