Dissolved Gas Analysis (DGA) of Arc Discharge Fault in Transformer Insulation Oils (Ester and Mineral Oils)

Zerye Ayalew, Kazuo Kobayashi, Satoshi Matsumoto, Masamichi Kato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

24 Citations (Scopus)


Transformer insulation oil is an important liquid for insulating and cooling of transformers. For many years' mineral oil has been used for as an insulating liquid in high voltage transformer. Mineral oil has good dielectric properties, however, due to environmental problem; recently many researchers have been looking for an alternative insulating liquid. Biodegradable and environmentally friendly ester oils have attracted more attention in recent years. This paper presents the experimental results of electrical arc stress on dissolved gases of transformer insulating oils (PFAE, MIDEL 7131 and mineral oil). The generated dissolved gases in the sample oils were examined by dissolved gas analysis (DGA) techniques. The test device used for testing is acrylic tube with a high voltage copper electrode at the top and a ground aluminum electrode at the bottom immersed in the oil. The experimental results from dissolved gas analysis (DGA) indicated that arc fault produce large amounts of hydrogen (H2) and acetylene (C2H2) with small quantities of methane (CH4), ethylene (C2H4) and ethane (C2H6) for both oils. Acetylene (C2H2) gas is the highest combustible gas generated by arc discharge in both mineral and ester oils. Therefore, there is a possibility that the diagnosis of a transformer filled with ester oil can be done using dissolved gas analysis (DGA) method.

Original languageEnglish
Title of host publication2018 IEEE Electrical Insulation Conference, EIC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781538641781
Publication statusPublished - 2018 Oct 3
Event2018 IEEE Electrical Insulation Conference, EIC 2018 - San Antonio, United States
Duration: 2018 Jun 172018 Jun 20

Publication series

Name2018 IEEE Electrical Insulation Conference, EIC 2018


Other2018 IEEE Electrical Insulation Conference, EIC 2018
Country/TerritoryUnited States
CitySan Antonio


  • Arc discharge
  • Dissolved gas analysis
  • Ester oils
  • Mineral oil

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Safety, Risk, Reliability and Quality


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