The numerical modelling and experimental validation of a partial discharge within an air-filled cavity bound in oil impregnated paper

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

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

1 Citation (Scopus)

Abstract

A numerical model to simulate a partial discharge within a bound cavity is presented in this paper. The partial discharge inception voltage and current pulse characteristics are established numerically and compared against experimental tests. The defect geometry used in this work is associated with a high voltage transformer bushing, namely a cavity formed between a punctured aluminium grading foil layer and the surrounding oil impregnated paper insulation. In the simulations, hydrodynamic drift-diffusion formulation is used to transport electron, positive and negative ion concentrations under the influence of an electric field; the movement of species is translated into an external current pulse. Experimentally, a high speed oscilloscope is used to capture the current pulse during a discharge. The numerical technique, defect sample preparation and high voltage laboratory setup, are discussed in detail. The results show a good agreement between numerical and experimental methods.
Original languageEnglish
Title of host publicationProceedings of the 2012 IEEE International Symposium on Electrical Insulation (ISEI 2012)
Place of PublicationPiscataway, N.J.
PublisherIEEE
Pages117-121
Number of pages5
ISBN (Print)9781467304887
DOIs
Publication statusPublished - 13 Jun 2012
Externally publishedYes

Keywords

  • partial discharge
  • insulation
  • dielectric breakdown
  • finite element method
  • pulse measurement
  • electrohydrodynamic

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