Electrical strength reduction of porcelain suspension insulators on AC transmission lines

A. Rawat, R. S. Gorur

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Porcelain suspension insulators that were in service for up to 38 years on 115-500 kV ac transmission lines were evaluated for residual electrical strength. It was seen that the reduction in electrical strength or aging, was significant for some insulators causing them to puncture. The reasons for the reduction in electrical breakdown strength were investigated using scanning electron microscopy and x-ray diffraction. The marked reduction in electrical breakdown strength with time has been correlated with large number and size of defects in the porcelain microstructure. It has been shown that local field enhancement created by these defects is sufficient to initiate progressive dielectric breakdown that ultimately leads to puncture.

Original languageEnglish (US)
Title of host publication2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
Pages245-248
Number of pages4
DOIs
StatePublished - Dec 1 2008
Event2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008 - Quebec City, QC, Canada
Duration: Oct 26 2008Oct 29 2008

Publication series

NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN (Print)0084-9162

Other

Other2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
CountryCanada
CityQuebec City, QC
Period10/26/0810/29/08

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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