The electric field modelling of a high voltage bushing with contaminants on the lower porcelain surfaces

Donald J. Smith, Scott G. S.G. McMeekin, Brian Stewart, P.A. Wallace

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

3 Citations (Scopus)

Abstract

In industry, there have been several documented failures on the lower (oil side) region of high voltage power transformer bushings. In these cases, the failure mode was considered to be due to localised discharges, as a result of accumulated surface contaminants. Given failure is often catastrophic, it is therefore difficult to establish the exact point of failure. In this paper, a numerical model that simulates the electric field and equipotential distributions for an oil impregnated paper bushing with contaminants on the lower porcelain surface is presented. The associated tangential electric field stresses are established through simulation for four likely locations of contaminants. The contaminants dependence on dielectric properties, location and thickness is modelled and discussed. The results demonstrate bushings are highly sensitive to contaminants on the lower porcelain.
Original languageEnglish
Title of host publicationProceedings of the 2011 Electrical Insulation and Dielectric Phenomena Conference (CEIDP 2011)
Place of PublicationPiscataway, N.J.
PublisherIEEE
Pages555-558
Number of pages4
ISBN (Print)9781457709852
DOIs
Publication statusPublished - 19 Oct 2011
Externally publishedYes

Keywords

  • porcelian insulators
  • conductivity
  • surface contamination
  • electric fields

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  • Cite this

    Smith, D. J., McMeekin, S. G. S. G., Stewart, B., & Wallace, P. A. (2011). The electric field modelling of a high voltage bushing with contaminants on the lower porcelain surfaces. In Proceedings of the 2011 Electrical Insulation and Dielectric Phenomena Conference (CEIDP 2011) (pp. 555-558). IEEE. https://doi.org/10.1109/CEIDP.2011.6232717