Analysis of Electrical Tree Growth in Crossed Link Polyethylene Cable Insulation under Different AC Voltages

Abstract

The suggested model in the paper is for exploring the electrical treeing characterization in 33kV 3core cross linked poly ethylene (XLPE) insulation. Where XLPE has found its path in HV (high voltage) insulation owing to its excellent dielectric strength, mechanical strength, and internal bonding between elements that is physical property. But aging is a vital factor for all type of insulation which is mostly affected by environmental condition that is mechanical stress and electrical stress by the formation of electrical treeing structure. Electrical tree characterization is the important phenomenon for estimation of age of insulation. So as to check the life expectancy of cable insulation study of tree growth is necessary at different voltage for different duration of time and different distance of electrode arrangement. From tree length verses time, width verses time and area of tree spread verses time gives an idea for the aging of cable insulation and pre-breakdown information. As applied voltage amplitude and applied time duration increases electrical tree length and tree spread area increases that are observed under digital microscope.