Gelling behaviour of natural ester transformer liquid under thermal ageing

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    There have been increasing interests on natural esters as potential substitutes to conventional mineral oils in transformers, due to their less-flammable, non-toxic and environmentally friendly properties. The application has been successful in traction and distribution transformers with sealed type. But the susceptibility to oxidation and hence the suspected gelling behaviour prevent the application of natural esters in free-breathing transformers. This paper presents an experimental study of gelling/oxidation behaviour of thin films of a natural ester under thermal ageing. Ageing experiments were carried out with presence of air at different temperatures of 120°C and 20°C and durations up to 2 years. The gelling/oxidation behaviour of natural ester was evaluated in terms of changes in viscosity and acidity. Results showed that both viscosity and acidity can be used to assess gelling/oxidation behaviour of natural ester from initial liquid phase to eventually gelled form. In addition to temperature, the thickness of the thin film samples has a significant effect on the gelling speed, i.e. the thinner of the film, the faster of the gelling speed. © 2012 IEEE.
    Original languageEnglish
    Title of host publicationICHVE 2012 - 2012 International Conference on High Voltage Engineering and Application|ICHVE - Int. Conf. High Voltage Eng. Appl.
    Pages643-647
    Number of pages4
    DOIs
    Publication statusPublished - 2012
    Event2012 International Conference on High Voltage Engineering and Application, ICHVE 2012 - Shanghai
    Duration: 1 Jul 2012 → …

    Conference

    Conference2012 International Conference on High Voltage Engineering and Application, ICHVE 2012
    CityShanghai
    Period1/07/12 → …

    Keywords

    • acidity change
    • ageing
    • Aging
    • distribution transformers
    • environmental friendly properties
    • Films
    • free-breathing transformers
    • gelling speed
    • initial liquid phase
    • Liquids
    • natural ester transformer liquid gelling behaviour
    • oxidation
    • power transformers
    • susceptibility
    • temperature 20 degC
    • temperature 120 degC
    • Temperature measurement
    • thermal ageing
    • thin film gelling behaviour
    • thin films
    • thin film samples
    • traction transformers
    • transformer mineral oils
    • transformer oil
    • viscosity
    • viscosity change

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