A dielectric frequency response model to evaluate the moisture content within an oil impregnated paper condenser bushing

David Smith, Scott McMeekin, Brian Stewart, Peter Wallace

Research output: Contribution to journalArticle


Increased moisture content within an oil-paper insulation system can significantly reduce its life expectancy, and for oil impregnated paper condenser type bushings, it is the most common cause of failure. Distinction between moisture contents using traditional power frequency tests of dissipation factor and capacitance can be difficult, particularly at ambient temperatures. Dielectric frequency response is becoming an established technique to measure the dissipation factor and capacitance of a bushing, but to date an accurate model to evaluate the condenser moisture content has not been presented using this technique.
Original languageEnglish
Pages (from-to)223-231
JournalIET Science Measurement and Technology
Issue number4
Publication statusPublished - Jul 2013



  • oil-paper insulation
  • moisture content
  • dielectric frequency response
  • bushing model

Cite this