Measurement of surface resistance of silicone rubber sheets under polluted and dry band conditions

Arshad*, A. Nekahi, S.G. McMeekin, M. Farzaneh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
90 Downloads (Pure)


Ageing and degradation of silicone rubber insulators in contaminated environments is a major concern due to their organic nature. Understanding the flashover process of silicone rubber insulators under contamination is very important and needs standardized tests and procedures. Surface resistance measurement can be used as an indication of ageing and contamination severity of outdoor silicone rubber insulators. This paper presents experimental and mathematical results on surface resistance of high-temperature vulcanized silicone rubber sheets under various environmental and contaminated conditions. Rectangular silicone rubber sheets were polluted artificially in laboratory using a modified solid layer method based on IEC 60507 and tested in a climate chamber where fog rate, humidity and temperature can be controlled. Influence of non-soluble salt deposit density (NSDD), pollution severity, relative humidity, ambient temperature, dry band location and width, and multiple dry bands on surface resistance have been investigated. The obtained results show that surface resistance decreases with increase in NSDD, pollution severity and relative humidity. Increase in surface resistance was observed with the formation of dry bands. Although surface resistance was effected by all parameters, the most dominant parameter was noted down to be pollution severity level and dry band formation. Repeatability of results was confirmed by performing each test five times and concluded that surface resistance measurement can be standardized to evaluate ageing and pollution severity of silicone rubber insulators. These results along with the available literature on equivalent salt deposit density (ESDD) measurement could be used to formulate a relation between ESDD and surface resistance that could be useful for evaluating the performance of silicone rubber insulators in wet and contaminated environments.
Original languageEnglish
Pages (from-to)1729-1738
Number of pages10
JournalElectrical Engineering
Early online date26 Oct 2017
Publication statusPublished - Sep 2018


  • silicone rubber, pollution, ambient temperature, relative humidity
  • relative humidity
  • NSDD
  • pollution
  • surface resistance
  • ambient temperature
  • dry bands
  • ESDD
  • silicone rubber

ASJC Scopus subject areas

  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Measurement of surface resistance of silicone rubber sheets under polluted and dry band conditions'. Together they form a unique fingerprint.

Cite this