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Polymeric insulation is widely used as the main insulation of power equipment and electronic devices. When DC voltage is applied on the polymer insulation, space charge may accumulate inside and cause electric field distortion. So, space charge accumulation is important for HVDC insulation materials. The origin of the space charge is considered to be from ionization and charge injection. The space charge accumulation is determined by the charge injection, transportation, extraction, trapping, and other factors. The charge injection rate at the electrode/insulation interface is a key factor that determines the charge accumulation inside insulation material.