Evaluation of High Voltage Power Cable Accessories under Electrical Stress from Overvoltages

This study investigates the effects of overvoltage stress on the power cable joint and terminations. The cable joint and termination are subjected to electrical aging through applied overvoltages to study the influence of overvoltage. The cable joints and terminations are the main areas for degradation. To study the influence of over-voltage in XLPE insulated cables, which are widely utilized for medium and high-voltage power transmission. Experimental studies based on the dielectric power factor measurements are carried out to assess the condition of power cable joints and end terminations. The sequence of overvoltage is applied to a cable joint installed in an 11kV XLPE insulated power cable. The measurement results acknowledge the relevance of dielectric power factor measurements in evaluating how electrical surges impact the cable insulation at the HV cable joint.