Investigation on Charge Transport Model Considering the Influence of Ionized Charges

Bipolar carrier transport models are widely used in the design of typical insulation structures, but the influence of ionized charges is rarely taken into account in the models currently used. In this report, based on the measurement results of actual ionization current parameters by blocking experiments, a modified bipolar carrier transport model is proposed, in which the influence of ionized charges is taken into account. The interfacial charge behavior of the XLPE-EPDM double-layer structure is simulated and calculated using the new model, and compared with the experimental results. It is found that the interfacial charge polarity of the XLPE-EPDM double-layer structure is reversed as the field strength increases, and the simulation results calculated using the new model agree with the experimental results, which proves the validity of the new model. This work enriches the original bipolar carrier transport model, making it better serve for engineering applications.