| Summary: | The high-voltage direct current (HVDC) electrical power transmission system utilizes direct current (DC) for bulk power transmission. Because of its numerous advantages which include system reliability and economic efficiency, HVDC transmission technology has been widely applied in the electrical engineering field. This paper presents a numerical simulation study to analyze charge accumulation profile within insulating materials which are Cross-Linked Polyethylene (XLPE), Low-Density Polyethylene (LDPE), and oil-impregnated paper insulation. This includes studying and explaining the effect of different values of permittivity and ambient temperature on the development of space charges within different types of insulating materials via numerical simulation. The bipolar charge transport (BCT) model is used to simulate the behavior of space charge in the insulation materials. The build-up of space charge within the insulation layer can affect the electric field distribution and, in extreme situations, it can lead to insulation failure. The fundamental findings of the numerical simulation in this paper reveal that changes in the ambient temperature and permittivity values could affect the dynamics and development of space charges within the insulating materials. © 2022 IEEE.
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