The Dynamic Character of Partial Discharge in Epoxy Resin at Different Stages of Treeing

Ibrahim Iddrissu, Zepeng Lv, Simon Rowland

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    Simultaneous imaging of electrical tree growth and partial discharge measurement have allowed 5 stages of tree growth to be identified. Partial discharge (PD) characteristics have been collected from tree growth in needle-plane epoxy resin samples under 15 kV peak AC voltage, and have been shown to behave differently at different stages of tree growth. Initial slow growth is accompanied by large discharges (about 10 pC). Thereafter, growth of fine channels is associated with smaller PDs (about 0.3 pC). It was observed that the tree propagation is further driven by even smaller PDs below the equipment sensitivity. However, when the tree approaches the counter electrode, the PD magnitude increases again and a more substantial tree grows with a low propagation rate. Reverse tree channels then occur from the planar electrode towards the needle, together with higher magnitude PDs characterized by thick and dark branches before breakdown.
    Original languageEnglish
    Title of host publicationIEEE Int. Conf. on Dielectrics
    Publication statusPublished - 2016
    EventInternational Conference on Dielectrics 2016 - Montpellier, France
    Duration: 3 Jul 20167 Jul 2016


    ConferenceInternational Conference on Dielectrics 2016
    Abbreviated titleICD 2016
    Internet address


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