Experimental Investigation on Influence of Shed Parameters on Surface Rainwater Characteristics of Large-Diameter Composite Post Insulators under Rain Conditions

Yanpeng Hao, Yifan Liao, Zhiqiang Kuang, Yijie Sun, Gaofeng Shang, Weixun Zhang, Guiyun Mao, Lin Yang, Fuzeng Zhang and Licheng Li
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Yanpeng Hao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yifan Liao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Zhiqiang Kuang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yijie Sun: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Gaofeng Shang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Weixun Zhang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Guiyun Mao: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Lin Yang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Fuzeng Zhang: Electric Power Research Institute, China Southern Power Grid Co., Ltd., Guangzhou 510080, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China

Energies, 2020, vol. 13, issue 19, 1-16

Abstract: The discharges of water columns and droplets between the sheds make the leakage distance not effectively used, which is one of the main reasons for flashover of composite post insulators under heavy rainfall. To study the influence of shed parameters on surface rainwater characteristics, artificial rain tests were carried out on the large-diameter composite post insulators under the rainfall intensity of 2–15 mm/min. L wc (the length of water columns at the edge of large sheds), N wc (the number of water columns at the edge of large sheds), N wde (the number of water droplets at the edge of large sheds) and N wds (the number of water droplets in the space between two adjacent large sheds) were proposed as the parameters of surface rainwater characteristics. The influences of large shed spacing, large shed overhang and rod diameter on the parameters of surface rainwater characteristics under different rainfall intensities were analyzed. The experimental results show that, under the same rainfall intensity, with the rise in large shed spacing, large shed overhang or rod diameter, L wc , N wc , N wde and N wds all increase. Under different rainfall intensities, the trends of the parameters with the change in shed parameters are basically invariant; however, the change ranges of the parameters are different. The increases in the parameters with the rises in shed parameters and rainfall intensity are mainly attributed to the change in the rainfall on the insulator surface. The experimental results can provide references for the quantitative description of surface rainwater characteristics and the design of large-diameter composite post insulators for DC transmission systems.

Keywords: large-diameter; composite post insulators; shed parameters; surface rainwater characteristics; heavy rainfall (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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