Electrochemical treeing studies: Voltage stress, temperature, cmd solution penetration effects under accelerated test conditions

Abstract

This paper reviews progress in studies sponsored by the Electric Power Research Institute on the subject of electro-chemical treeing in extruded miniature cable insulations. Effects of applied voltage stress and controlled temperature on tree growth in polyethylene (PE) and cross-linked polyethylene (XLPE) are discussed. In addition, the relationships between tree growth and cable dielectric strength for PE, XLPE, and mineral-free Ethylene-Propylene Rubber (EPR) are presented. Evidence is provided to demonstrate that a salt incororated into the water employed to accelerate tree growth is present in the tree region.