PD characteristics and degradation in PET insulation with vented and unvented internal voids

Dipasree Adhikari, Donald Hepburn, Brian Stewart

    Research output: Contribution to journalArticle


    Voids in solid insulation give rise to partial discharge (PD). Factors affecting PD activity in internal voids include the type of gas contained, gas pressure and surface properties of the void. Identifying the presence of PD and understanding the measurable parameters may allow improved management of industrial assets. This paper reports on quantifiable and measurable differences in PD activity and material degradation among voids which have vented and unvented channels. To investigate changes in PD activity with void characteristics experiments are carried out using artificial voids created from layered sections of poly(ethylene terephthalate) (PET) polymer.
    Original languageEnglish
    Pages (from-to)65-72
    Number of pages8
    JournalElectric Power Systems Research
    Publication statusPublished - Jul 2013



    • partial discharge (PD)
    • polymeric insulation
    • solid insulation
    • voids

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