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Title: The Role of Bulk Charge Transport Processes in Electrical Tree Formation and Breakdown Mechanisms in Epoxy Resins
Authors: Chalashkanov, N. M.
Dodd, S. J.
Dissado, L. A.
Fothergill, J. C.
First Published: 19-Jan-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23(6)
Abstract: Electrical treeing experiments have been conducted at different temperatures and levels of absorbed moisture in Araldite CY1311 epoxy resin samples above their glass transition temperature, i.e. when the resin was in a flexible state. The fractal dimension of the electrical trees obtained and the rate of tree growth were found to depend on the environmental factors: temperature and humidity. It has also been found that at certain levels of temperature and moisture absorbed in the samples, a transition occurs from electrical treeing degradation to breakdown by thermal runaway. Complementary investigations of the dielectric properties of the same epoxy resin system have revealed that a bulk quasi-dc (QDC) charge transport mechanism takes place above the glass transition temperature, and we show that the characteristic features of the dielectric response are related to the shape of the electrical treeing degradation and the transition to thermal breakdown. This is explained qualitatively through the effect of the bulk QDC charge transport process in modifying the local space charge electric field distribution.
DOI Link: 10.1109/TDEI.2016.006141
ISSN: 1070-9878
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Engineering

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