Simulation study of partial discharge in air gap of XLPE cable

Partial Discharge (PD) is one of the manifestations of insulation deterioration in electrical equipment. In order to study the variation law of PD caused by air gap in cross-linked polyethylene (XLPE) cables, a PD simulation circuit was built in Simulink. Under the influence of different positions, sizes and power supply voltages of air gap, The variation characteristics of PD current are studied. The results show that the discharge current is related to the position, size and supply voltage of the air gap. When the air gap is closer to the conductor, the amplitude of discharge current is larger. The larger the air gap size, the larger the discharge current and discharge time. The greater the supply voltage, the greater the scope of PD. The results provide data reference for the follow-up research on PD localization.