Abstract

AbstractThe partial discharge (PD) activity during propagation of electrical treeing in epoxy resin is described. The electrical trees grew in needle‐plane samples without and with an internal barrier up to the final breakdown. The simultaneous tree growth and discharge activity show a correlation between the propagation state of the tree and the thereby measured PD. Especially, the changes in the tree structure can clearly be detected. Based on these characteristics a new model describing tree growth is presented. It appears that measurements from machine insulation can be interpreted in terms of the PD pattern. Copyright © 2005 John Wiley & Sons, Ltd.

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