A Review on Electrical Treeing in Solid Dielectrics

Electrical trees constitute a cause for breakdown in solid dielectrics. Electrical trees are related with Partial Discharges (PD), enclosed defects, which in turn cannot be separated from faulty interfaces. In this review, certain aspects related to electrical treeing such as space charges, PD and enclosed voids are investigated. Charges related to electrical treeing must be classified in two categories. The charges that are redistributed continuously in the interior of the tree channels and charges that are moving and being trapped in the solid dielectric. The first category of charges constitute the PD charges and the second category charges are referred to as the space charges.