Impact of high resistance faults on impedance protection perfomance

Rhulani Matshidza, Adam Bartylak, Rastko Zivanovic

Research output: Contribution to journalConference articlepeer-review


ESKOM has relied primarily on impedance-based measurement protection relays for the protection of EHV transmission lines. One of the main disadvantages of a distance relays is the limited fault resistance measurement capability. There are currently more than 20 relay types applied as transmission line protection on the ESKOM's transmission network with the most common types of characteristic being mho and polygonal characteristics.

Original languageEnglish
Pages (from-to)399-403
Number of pages5
JournalIEE Conference Publication
Issue number2005-11034
Publication statusPublished - 2005
Externally publishedYes
EventEighteenth International Conference and Exhibition on Electricity Distribution, CIRED 2005, Technical Reports - Session 1: Network Components - Turin, Italy
Duration: 6 Jun 20059 Jun 2005


  • Algorithm
  • Distance protection
  • High resistance fault
  • Relays


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