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

Energies

Fuzeng Zhang¹  Zhiqiang Kuang²  Gaofeng Shang²  Licheng Li²  Weixun Zhang²  Guiyun Mao²  Lin Yang²  Yijie Sun²  Yifan Liao²  Yanpeng Hao² 

[1] Electric Power Research Institute, China Southern Power Grid Co., Ltd., Guangzhou 510080, China;School of Electric Power, South China University of Technology, Guangzhou 510640, China;

关键词: large-diameter;    composite post insulators;    shed parameters;    surface rainwater characteristics;    heavy rainfall;   

DOI  :  10.3390/en13195011

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown