Electric field computation for a 400 kV composite cross-arm

Vidyadhar Peesapati, C. Zachariades, Q. Li, S. M. Rowland, I. Cotton, F. Allison, D. Chambers, P. Rhodes

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

If not well designed, high voltage composite insulators are prone to ageing and failure due to corona and electric field stress. Particular care is required designing areas where the metal end connections meet the insulator core, otherwise a large electric field enhancement is observed. It is difficult to completely eradicate corona on any insulator, thus manufacturers try and minimise this phenomenon by designing the assembly to increase the corona inception voltage across the end connections and other metallic components. Often this involves introduction of corona rings, especially at the high voltage end of the composite insulator, to manage the magnitude of the electric field. The use of FEA to design corona/grading rings and optimise their position has recently been of great interest. The present paper reviews the use of FEA simulation to design stress relief devices across the high voltage end of a composite insulating cross-arm. Design work has been realised in practice and verified using corona inception measurements and compared to previous FEA results. © 2012 IEEE.
Original languageEnglish
Title of host publicationAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP|Annu. Rep. Conf. Electr. Insul. Dielectr. Phenom. CEIDP
Pages790-793
Number of pages3
DOIs
Publication statusPublished - 2012
Event2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012 - Montreal, QC
Duration: 1 Jul 2012 → …

Conference

Conference2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012
CityMontreal, QC
Period1/07/12 → …

Keywords

  • composite cross-arm
  • corona
  • Electric field analsyis
  • FEA
  • field control
  • Finite element analysis
  • Insulators

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