The core materials of insulation manufacturing are mainly high-molecular composite materials, such as cross-linked polyethylene (XLPE), epoxy glass cloth sheets, and polyimide films, which have characteristics of high voltage resistance, resistance to aging, and low loss. The mainstream processes include vacuum casting, molding, impregnation baking, and cross-linking modification. For example, the XLPE cable insulation layer is chemically or radiatively cross-linked to enhance heat resistance and insulation strength; epoxy insulation components use vacuum pressure impregnation (VPI) to reduce local discharge and ensure stability in high-voltage conditions.
