Investigations into the stray gassing of oils in the fault diagnosis of transformers

Daniel Martin, Nick Lelekakis, Jaury Wijaya, Michel Duval, Tapan Saha

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)


In this paper, we present an analysis of the gases generated by mineral oil and cellulose transformer insulation, at temperatures lower than those expected to be caused by an actual thermal fault. Gassing at relatively low temperatures, 100 O C to 200O C, often presents a problem to the asset manager since it can be difficult to distinguish this event from that caused by an actual fault. Previous stray gassing tests were only performed for 164 h, at two temperatures, and two oxygen contents. We tested a mineral oil under 20 different conditions of oxygen and water content, for up to nearly 100 days. We found that at low-temperature levels and that by using high oxygen levels, the generation of ethylene can be more significant when compared to the other hydrocarbon gases than first thought.

Original languageEnglish
Article number6810884
Pages (from-to)2369-2374
Number of pages6
JournalIEEE Transactions on Power Delivery
Issue number5
Publication statusPublished - 1 Oct 2014


  • Dissolved gas analysis
  • oil insulation
  • paper insulation
  • power transformer insulation
  • power transformers

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