NDLI: Additional salt deposit density of polluted insulators in salt fog

Content Provider	IET Digital Library
Author	Jiang, Xingliang Guo, Yujun Meng, Zhigao Li, Zhenyu Jiang, Zidan
Abstract	The surface pollution layer of polluted insulator absorbs fog water and gets damp in salt fog. Meanwhile, the salts in the salt fog deposit on insulator surface, which increases the surface conductivity and degrades the flashover performance of insulators. At present, the effects of fog water conductivity (γ 20) and equivalent salt deposit density (ESDD) are analysed separately, which does not reveal the essence of the flashover in salt fog. In this study, a plenty of experiments on porcelain, glass and composite insulators are carried out in salt fog conditions, and the 50% flashover voltage stress, leakage current and variation of ESDD during the wetting process are studied. The concept of additional salt deposit density (ASDD) is proposed to quantitatively analyse the additional ESDD caused by salt fog. The test results indicate that the ac flashover voltage stress decreases with the increase of both ESDD and fog-water conductivity. Both the ESDD and leakage current become larger in salt fog compared with those in clean fog. The ASDD can be applied to analyse the combined effect of ESDD and fog-water conductivity and be expressed as ASDD = k × γ 20 × ESDD. Then the flashover voltage stress is E = A × (ESDD + ASDD)−a . The values of k for the porcelain, glass and composite insulators are 0.179, 0.191 and 0.230, respectively. The flashover in salt fog environment is a special kind of pollution flashover in essence.
Starting Page	3691
Ending Page	3697
Page Count	7
ISSN	17518687
Volume Number	10
e-ISSN	17518695
Issue Number	Issue 15, Nov (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/10/15
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2015.1387
Journal	IET Generation, Transmission & Distribution
Publisher Date	2016-11-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Flashover Voltage Stress Additional Salt Deposit Density ASDD Composite Insulators Connector Equivalent Salt Deposit Density ESDD Flashover Fog Fog-water Conductivity Gaseous Insulation, Breakdown And Discharges Glass Insulator Insulator Insulator Contamination Leakage Current Polluted Insulator Pollution Flashover Porcelain Insulator Power Line Supports Salt Fog Surface Pollution Layer Wetting Process
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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