Phenomena and Mechanisms of Tree Inception in Epoxy Resins
- 1 December 1979
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electrical Insulation
- Vol. EI-14 (6) , 306-314
- https://doi.org/10.1109/tei.1979.298186
Abstract
The inception of ac treeing has been investigated in various cast epoxy resins, using a needle-plane test configuration. Mechanical stress due to shrinkage in the curing process is present at the needle tip, and in some cases causes micro-cracks. Lower tree inception voltages were observed in mechanically stressed specimens indicating that the micro-cracks act as weak points. In less stressed samples which have higher tree inception voltages light emission, probably electroluminescence, was observed at a voltage much lower than that of tree inception. In those cases, a small discolored area (about 10 μ) appeared prior to tree inception as the ac applied voltage was increased.Keywords
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