Electrostatic modelling of gas-filled voids and conductive particles in highly non-uniform electric fields

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Abstract

The reliability of modern high voltage equipment strongly relies upon the prevention of partial (or complete) electrical discharges. Electric field enhancement, caused by defects and contaminants inside insulating materials, can play a major role in discharge initiation, potentially leading to the catastrophic failure of critical equipment. The problem is exacerbated when considering existing regions of nonuniform electric field, possibly caused by unintended metallic protrusions, surface roughness, and other high aspect-ratio features. In this work, gas-filled voids and conductive particles of spheroidal geometry were investigated under highly nonuniform field conditions. By employing an analytical methodology, the electric field distribution has been modelled around a spheroidal dielectric inclusion, subjected to a nonuniform electric field, and generated with a needle-plane electrode system. A systematic study was conducted to investigate the effects of inclusion type (gas-void or conductive particle); inclusion proximity to the HV electrode; inclusion radius; inclusion eccentricity; and needle curvature, on the enhancement factor of the redistributed field inside and outside of the inclusion. The results arising from this work further advances the understanding of insulation defects and contaminants near complex geometrical features, aiding the future development of high voltage power and pulsed power systems.
Original languageEnglish
Title of host publication23rd International Symposium on High Voltage Engineering (ISH 2023)
Place of PublicationStevenage
Pages1022-1028
Number of pages7
Volume2023
Edition46
ISBN (Electronic)9781839539923
DOIs
Publication statusPublished - 9 Apr 2024
EventThe 23rd International Symposium on High Voltage Engineering - Glasgow, United Kingdom
Duration: 28 Aug 20231 Sept 2023
https://ish2023.org/

Publication series

NameIET Conference Proceedings
ISSN (Electronic)2732-4494

Conference

ConferenceThe 23rd International Symposium on High Voltage Engineering
Abbreviated titleISH2023
Country/TerritoryUnited Kingdom
CityGlasgow
Period28/08/231/09/23
Internet address

Keywords

  • electrical insulation
  • dielectrics
  • insulation defects
  • electric field enhancement
  • nonuniform electric field

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