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Polymeric insulation aging is closely related to the change of its physical and chemical properties. An attempt is tried to correlate the space charge and electroluminescence (EL) behaviors of aged low-density polyethylene (LDPE) samples films. LDPE samples were aged in a thermal aging oven with five different time intervals (120, 240, 360, 480 and 600h). After thermal aging, their molecular structures...
Water treeing is associated with high electric stress and contaminated environment involving moisture, water or chemical solutions. It is generally accepted that water trees cause reduction in breakdown voltage of cables, and currently suspected that water trees lead to final failure and decrease in the lifetime of cables [1]. A considerable amount of experimental data on water treeing is now available...
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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