A new model for charges transport and build-up in extruded insulation (XLPE) for HVDC cables
Résumé
This paper presents a bipolar charge transport model based on new assumptions of energy levels distribution of traps and allowing to predict the XLPE electrical behaviour under DC stress. The model assumes that shallow traps are distributed over a single energy level and can participate in transport with a hopping mobility, whereas an exponential distribution is used to model the repartition of deep traps. Trapping, detrapping and recombination of charges are taken into account. Results show that the model (simulated under COMSOL Multiphysics®) reproduces the main characteristics of space charge density obtained by PEA measurement on degassed XLPE plates samples.
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