Using polyethylene insulation material with added peroxide crosslinking agent, the extrusion of the conductor shielding layer insulation layer insulation shielding layer is completed through three-layer co extrusion, and then the cross-linking process is continuously and uniformly completed through a sealed cross-linking tube filled with high temperature and high pressure nitrogen gas. The heat transfer medium is nitrogen (inert gas), and cross-linked polyethylene has excellent electrical properties and a production range of up to 500KV level.
