Failure modes of porcelain and toughened glass suspension insulators

Ravi S. Gorur

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

6 Scopus citations

Abstract

The paper highlights the differences in failure modes and electrical and mechanical strengths of porcelain and toughened glass insulators that have been in service for many years. The findings are based on a vast body of published literature, as well as a study performed on insulators that were in service for up to 70 years. The insulators were tested for insulation resistance, dielectric strength, porosity and residual mechanical strength. The microstructure of the porcelain was analyzed using a scanning electron microscope. Significant differences in the compositional and mi-crostructure details of porcelain insulators were observed. The electrical and mechanical strengths of porcelain insulators was found to vary significantly from one manufacturer to another, with some aged insulators showing marginal changes and others showing significant reduction in these parameters. Glass insulators evaluated showed small reduction in their residual mechanical strength when compared to new ones. These differences should have significant impact on system reliability and maintenance procedures adopted by utilities.

Original languageEnglish (US)
Title of host publication2011 Electrical Insulation Conference, EIC 2011
Pages221-225
Number of pages5
DOIs
StatePublished - Sep 19 2011
Event30th Electrical Insulation Conference, EIC 2011 - Annapolis, MD, United States
Duration: Jun 5 2011Jun 8 2011

Publication series

Name2011 Electrical Insulation Conference, EIC 2011

Other

Other30th Electrical Insulation Conference, EIC 2011
CountryUnited States
CityAnnapolis, MD
Period6/5/116/8/11

Keywords

  • aging
  • mechanical and electrical strength
  • microstructure
  • porcelain
  • suspension insulators
  • toughened glass

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Gorur, R. S. (2011). Failure modes of porcelain and toughened glass suspension insulators. In 2011 Electrical Insulation Conference, EIC 2011 (pp. 221-225). [5996150] (2011 Electrical Insulation Conference, EIC 2011). https://doi.org/10.1109/EIC.2011.5996150