Effects of corona ring design upon impulse voltage withstand level of 380 kV V-strings

Suat Ilhan*, Aydogan Ozdemir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

This study presents the influence of corona rings on impulse withstand performance of 380 kV V-insulator strings. Those strings comprising cap-and-pin type glass insulator units are one of the most common configurations in Turkish National Power Transmission System. Laboratory test setup was constructed for the centre phase of a full scaled tower. Laboratory tests are performed to investigate the lightning and switching impulse performance of the strings equipped with the existing racket type corona rings and the circular type corona rings. Withstand voltages, lower flashover probability levels, flashover routes and times to flashovers are determined under dry and wet test conditions. In addition, some 3D field simulations regarding potential and electric field distributions are also performed for the interpretation of insulator surface flashovers.

Original languageEnglish
Article number6032834
Pages (from-to)1638-1646
Number of pages9
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume18
Issue number5
DOIs
Publication statusPublished - 1 Oct 2011

Keywords

  • Corona ring
  • flashover voltage
  • lightning impulse
  • switching impulse
  • withstand voltage

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