Modeling flashover of AC outdoor insulators under contaminated conditions with dry band formation and arcing

L. Bo, R. S. Gorur

Research output: Contribution to journalReview article

27 Scopus citations


School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona, USA This paper presents a theoretical model for evaluating flashover performance of insulators under contaminated conditions. The model introduces several new features when compared with existing models such as, the formation of dry bands, variations in insulator geometry and surface wettability. The electric field distribution obtained from software for 3-Dimensional models along with form factor are used to determine the dimensions of the dry bands and the onset of arcing. The model draws heavily from experimental measurements of flashover voltage and surface resistance under wet conditions of porcelain and composite insulators. The model illustrates the dominant role played by the insulator shape and housing material on the flashover performance.

Original languageEnglish (US)
Article number6215110
Pages (from-to)1037-1043
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number3
StatePublished - Jun 1 2012



  • Composite insulators
  • EPDM
  • contamination performance
  • epoxy
  • porcelain insulators
  • silicone rubber
  • surface hydrophobicity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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