Charge Simulation of XLPE Cable Based on Bipolar Carrier Model

XLPE cable is widely used in power transmission because of many advantages, high voltage direct current (HVDC) cable is greatly affected by space charge during operation. In this paper, the variation of charge density and electric field intensity distribution in XLPE cable under different working conditions is studied based on bipolar carrier transport model. The results show that in the absence of temperature gradient, the charge density growth rate of copper and XLPE junction region is significantly higher than that of other regions. When there is a temperature gradient, the overall charge distribution and electric field intensity distribution are basically the same as without temperature gradient. In the direction of XLPE cable core, the field strength increases in some areas, while the part away from the core direction decreases gradually. When the cable ages, the space charge density increases, and the increase in the density of the trap in the insulating medium leads to an increase in the charge density. The research results will provide some reference for XLPE cable operation. The innovation lies in the application of a bipolar carrier transport model to investigate the intricate details of charge density and electric field intensity in XLPE cables, particularly focusing on the challenges posed by space charge during the operation of high voltage direct current cables. The findings contribute to the knowledge base for enhancing the design and operation of XLPE cables, with potential implications for the broader field of power transmission.