NDLI: Influence of snow accretion on arc flashover gradient for various types of insulators

Content Provider	IET Digital Library
Author	Hu, Yuyao Jiang, Xingliang Guo, Sihua Xian, Richang Zong, Chunyu Yang, Zhongyi Han, Xingbo
Abstract	Atmospheric snow accretion along the insulators can eventually bridge adjacent shed spacing, which pose severe risks to the security of power networks. Aiming to investigate the influence of snow accumulation on the electrical performance of various types of insulators, the flashover tests of snow-accreted insulators were conducted. The effects of various factors on the electrical characteristics of insulators were analysed based on the experimental data. Results show that AC arc flashover gradient of the insulator covered with nonuniform snow accumulation is lower than that of the uniform snow-covered insulator. The former is as low as 22.5% lower than the latter. Moreover, the AC arc flashover gradient of the porcelain and glass insulators is 0.27–6.27% higher than that of the DC. For a silicone rubber insulator, this gap is greater than 20%. The flashover gradient of the glass insulator is the minimum at the snow thickness of 10 mm. The flashover process of snow-covered insulator is neither similar to that of the contaminated insulator nor different from that of the iced insulator but a combination of the two. The presented work helps to better understand the flashover mechanism of snow-covered insulators, and take efforts to mitigate its effects.
Starting Page	2361
Ending Page	2367
Page Count	7
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 12, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2020.0012
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-03-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Arc Flashover Gradient Connector Contaminated Insulator Dielectric Breakdown And Discharges Flashover Flashover Mechanism Flashover Process Flashover Tests Glass Insulator Ice Iced Insulator Insulator Insulator Contamination Land Surface Snow Nonuniform Snow Accumulation Overhead Power Line Porcelain Power Line Supports Power Overhead Line Reliability Silicone Rubber Insulator Size 10.0 Mm Snow Snow Accretion Snow Thickness Snow-accreted Insulator Statistics Uniform Snow-covered Insulator
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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