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This paper presents an experimental study on electrical tree propagation from a point electrode in an epoxy block subjected to polarity-reversed repetitive pulses after dc prestress. When the epoxy block at one end of a long coaxial cable is charged by a dc prestress and then directly grounded by closing a switch at the other end of the cable without any resistance, repetitive voltage pulses are applied...
This paper presents an attempt of modelling the treeing structures expanding in an insulating polymer. By assuming the treeing shapes to simple geometries and by considering the polymer /tree interface with or without charge, we establish a mathematical expression describing the dynamics of the propagation.This shows the relationship between the treeing length, the current and the loss factor and...
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