AC clean fog tests on non ceramic insulating materials and a comparison with porcelain

A. De La O, R. S. Gorur, J. Chang

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


AC Clean Fog tests were performed on NON CERAMIC materials used for outdoor high voltage insulators, namely, Room and High Temperature Vulcanizing (RTV and HTV) silicone rubber, and ethylene propylene rubber (EPR), with porcelain used as the reference. The steam input rate was varied upwards from the value standardized for porcelain insulators. Results indicate that higher steam input rates produce a significant reduction in the flashover voltage of silicone rubber family materials, although it is always higher than that obtained for EPR and porcelain. For EPR, the reduction is less and is similar to that established for porcelain. The mechanisms involved have been examined. The trend in the results is found to be consistent for different formulations and insulator geometries of the generic polymer (e.g. silicone rubber, EPR) evaluated. A new, simple method for consistently applying uniform contamination on silicone rubber (both RTV and HTV) is described, without the use of extensive physical or chemical treatments, or prior conditioning by dry band arcing.

Original languageEnglish (US)
Pages (from-to)2000-2008
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number4
StatePublished - Oct 1994


  • Contamination
  • clean fog
  • flashover voltage
  • steam input rate
  • surface conductance

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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