The Space Charge Characteristics of XLPE Cable Peelings Under Power Frequency Voltage

The reliability of the cable plays an important role in the stable operation of the power system. However, the dielectric strength of cables declines under the effect of AC electrical and thermal stresses when in operation. The gradual degradation processes caused by composite stress on dielectrics, known as electrical aging, have a close relationship with the reliability of electrical equipment, though are not completely recognized. During operation, alternating voltage will lead to the change of internal charge distribution of cable insulation, resulting in local electric field distortion and aging of insulation materials. At present, the most widely used cable insulation material is XLPE, so it is necessary to study the space charge distribution of XLPE high AC voltage.