Influence of electrode separation on electrical treeing in a glassy epoxy resin

Hualong Zheng, Simon Rowland, Ningyu Jiang

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    Abstract

    The influence of electrode separation on electrical treeing in a glassy epoxy resin of needle-plane geometry has been studied under a fixed 50 Hz AC stress of 15 kV peak voltage. Growth of electrical trees is compared between samples of 1 mm, 2 mm, 4 mm and 6 mm electrode separation. The tree inception times and their distributions imply a change of mechanism for tree initiation when the electrode separation is above 4 mm. Subsequent tree growth was not affected by electrode separation. The trees were of the filamentary non-conductive type and did not feature a classical runaway to breakdown. Rather, tree propagation along the needle axis has been found to follow a rate independent of electrode separation. This implies that the filamentary tree growth is not dominated by modification of the electrical field in front of the tree tips, although such a conclusion is in conflict with existing treeing models. Breakdown does not
    occur rapidly after a filamentary tree fully crosses the dielectric, but is still primarily determined by the average electrical field across the sample.
    Original languageEnglish
    Title of host publicationIEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
    DOIs
    Publication statusPublished - 2018

    Keywords

    • electrical tree
    • Epoxy resin
    • electrode distance

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