NDLI: Flashover of contaminated nonceramic outdoor insulators in a wet atmosphere

Content Provider	IEEE Xplore Digital Library
Author	de la O, A. Gorur, R.S.
Copyright Year	1994
Abstract	This paper deals with the flashover mechanism and performance of contaminated nonceramic (also known as composite and polymeric) outdoor insulators under wet conditions. Two types of wetting that occur in service, namely fog and rain, were considered. Different profiles of line insulators having weathersheds made from material families such as, high temperature vulcanizing (HTV) silicone rubber (SR) and ethylene propylene (EP) diene monomer rubber, were evaluated. The results demonstrate that the performance, and hence the relative ranking of nonceramic line insulators is influenced by the wetting mode and insulator geometry; that flashover of contaminated insulators can occur with rain at a much lower contamination severity than with fog; and that the mechanism of contamination flashover under rain is significantly different from that under fog condensation. New insulator profiles have been identified and tested to show that they can provide improved flashover performance, when compared to existing designs. This work proves that a comprehensive evaluation of outdoor insulator performance can be obtained by performing flashover tests that include more than one form of wetting, and hence illustrates the limitations of current standard contamination tests that employ only one form of insulator wetting.
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
Starting Page	814
Ending Page	823
Page Count	10
File Size	1259668
File Format	PDF
ISSN	10709878
Volume Number	5
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Rain Contamination Insulator testing Rubber Polymers Plastic insulation Temperature Strontium Geometry
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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