Design of Measurement System of Electrical Tree in XLPE Power Cable Insulation

Based on the principle of impulse current method,a partial discharge measurement system was designed for the continuous test of discharge of electrical tree in XLPE cable insulation.In addition,the experimental results of conventional corona model verified the stability and reliability of the system.A real-time microscope digital imaging system was constructed for the real-time observation of the initiation and propagation of electrical tree.An experiment on a 110kV XLPE cable sample shows that the whole system can fulfill the requirements of real-time observation of electrical treeing and its continuous partial discharge measurement.This study helps provide an experimental platform for the study of initiation and propagation mechanism of electrical tree in XLPE cable insulation as well as its partial discharge characteristics.