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Internal discharge and electrical treeing in polymers involve the presence of voids or the creation of low-density channels at high fields to provide a favourable condition for impact ionization. A great deal of experimental evidence indicates that polyethylene contains a high density of microvoids with the sizes varying from less than 1 µm to larger than 10 µm. The microvoids may not be the direct...
In our earlier paper [1] we have presented a new model for electrical treeing in polymers. This model states that electrons and holes can be injected into the polymer from a metallic needle electrode either by tunneling via localized states or by thermionic emission, and that these injected charge carriers will form space charges which will then modify the electric field distribution and produce channels...
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