Quantification of corona discharges on nonceramic insulators

B. Pinnangudi, R. S. Gorur, A. J. Kroese

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


This paper attempts to establish a correlation of the visual images of corona obtained from a camera with discharge magnitude measured with conventional partial discharge equipment. A linear relationship is shown between the transformed image parameters and the discharge magnitude, thereby providing a means for quantifying corona observations made during routine maintenance inspections of insulators from ground. Different insulator designs using silicone rubber (SIR) and ethylene propylene diamene monomer (EPDM) housings were examined. The effect of fog has been examined by performing experiments inside a fog chamber. It is shown that this information can be used along with the corona degradation characteristics of housing materials to identify discharge patterns that can pose problems to the integrity of the insulator.

Original languageEnglish (US)
Pages (from-to)513-523
Number of pages11
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number3
StatePublished - Jun 2005


  • Corona
  • Field inspection
  • Hydrophobicity
  • Image processing
  • Insulators
  • Partial discharge

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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