Tree Growth in Epoxy Resin Under Unipolar and Bipolar Square-Wave Voltages

Faisal Aldawsari, Fang Liu, Harry McDonald, Simon Rowland

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


The influence of DC bias on electrical tree growth
under 13 kV square-wave voltages at 50 Hz in epoxy resin is
investigated. Tree growth is captured in a needle-plane
configuration using a CCD camera and digital microscope. Tree
growth is accelerated under positive unipolar square waves in
comparison with a bipolar square waves and negative square
waves. Tree growth under positive and negative unipolar square
wave voltages can be described as a three-stage process, while
under bipolar square wave voltages tree growth follows a fivestage process. Reverse tree growth is observed before breakdown
only under bipolar square waves. No reverse tree growth was
seen under unipolar square waves of either polarity. Damage was
observed at the bottom of the plane surface of epoxy where the
reverse tree channels initiated.
Original languageEnglish
Title of host publicationInternational Conference on Dielectrics
Publication statusPublished - 2022


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