Cross-linked polyethylene is an excellent thermosetting insulating material that is currently widely used to insulate low, medium and high-voltage cables. Among them, the 345KV ultra-high voltage cross-linked polyethylene (XLPE) power cable, Dadong Electric Co., Ltd. In 2015, it passed Taipower’s 345kV cross-linked PE cable finalization test and introduced the leading brand of cable machinery manufacturing, Finland’s Maillefer CCV high-quality dry vulcanized three-layer extruder, using the most advanced three-layer head design, feeding system, and X- ray and EHT systems can greatly improve production efficiency and ensure stable quality.