Investigation of electrical failures in porcelain cap and pin line insulators

A. P. Mishra, R. S. Gorur

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

2 Scopus citations

Abstract

Suspension and dead-end porcelain insulator strings were removed after 25-30 years in service for various reasons, and the insulator bells (units) were evaluated in the laboratory. Some units failed the puncture test and these were cut open and analyzed. The electric field due to the presence of microscopic defects in porcelain was modeled using a 3 D software package. It has been shown that the local electric field enhancement can be high enough to cause dielectric breakdown of porcelain. The electrical deterioration is a slow process. The breakdown process creates phase changes in the porcelain microstructure and this was confirmed by scanning electron microscopy.

Original languageEnglish (US)
Title of host publicationAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Pages95-98
Number of pages4
DOIs
StatePublished - 2007
Event2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Vancouver, BC, Canada
Duration: Oct 14 2007Oct 19 2007

Other

Other2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
CountryCanada
CityVancouver, BC
Period10/14/0710/19/07

ASJC Scopus subject areas

  • Engineering(all)
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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