Electric field computation of composite line insulators up to 1200 kV AC

T. Doshi, R. S. Gorur, J. Hunt

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


Satisfactory operation of composite insulators is intimately related to the surface electric field (stress) distribution. This paper presents results of calculation of the electric field distribution for composite insulators up to 1200 kV, using a 3D software package based on the Boundary Element Method. The impact of corona and grading rings, single and bundled conductors, insulator orientation (dead-end and suspension), single and double units, and surface condition (dry and wet) on the electric field distribution has been analyzed. For UHV systems (higher than 750 kV ac) the use of dual insulators with individual corona rings at the line and ground end and a common grading ring at the line end is beneficial. The existence of optimal dimensions of corona and grading arrangement has been illustrated on a 1000 kV insulator string. It was found that the dead end insulators experience higher electric stress when compared to their suspension counterparts and this difference gets more prominent as the system voltage increases.

Original languageEnglish (US)
Article number5931075
Pages (from-to)861-867
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number3
StatePublished - Jun 2011


  • Composite insulators
  • EHV and UHV systems
  • bundled conductors
  • dead end
  • electric field/stress calculation
  • grading rings
  • suspension

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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