NDLI: Mechanism of contaminant accumulation and flashover of insulator in heavily polluted coastal area

Content Provider	IEEE Xplore Digital Library
Author	Huafeng Su Zhidong Jia Zhicheng Guan Licheng Li
Copyright Year	1994
Abstract	This paper attempts to address the issue of serious insulator string partial discharge activity and flashover resulted from severe contaminant accumulation of insulators on a 220 kV transmission line in coastal areas during winter when the rain is sparse and heavy contamination accumulates over time. Samples of silicone composite insulators, glass insulator with RTV coating and ceramic station insulator are tested in a series of experiments including ESDD and NSDD measurement, hydrophobicity classification, the measurement of static contact angle, TGA and FTIR analysis. Taking the terrain of the transmission line into consideration, it probes into the mechanism of contaminant accumulation and flashover of insulators in heavily polluted coastal areas. A conclusion has been made that the high salt deposit on the surface of the insulators resulted from peculiar terrain and the dampening effect on hydrophobicity transfer characteristic of silicone composite material lower the flashover voltage of silicone composite insulators and ceramic or glass insulators with RTV coatings leading to severe partial discharge activity and flashovers during dry winter. Finally it sums up the lessons in regards to this problem and proposes appropriate solutions.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
File Size	1158801
File Format	PDF
ISSN	10709878
Volume Number	17
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulators Surface treatment Coatings Glass Partial discharges Surface contamination Flashover partial discharge activity Coastal area, flashover mechanism, insulators
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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