High voltage and ultra-high voltage direct current (DC) cross-linked polyethylene insulated sea electric power cable

The invention relates to a high voltage and ultra-high voltage direct current (DC) cross-linked polyethylene insulated sea electric power cable, comprising a waterproof conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive waterproof buffer layer, a metal shielding layer, a semi-conductive plastic reinforcing protective layer, filling strips, a cabling strapping tape, a metal armoring layer and an outer coating respectively from inside to outside in sequence. The high voltage and ultra-high voltage DC cross-linked polyethylene insulated sea electric power cable adopts a positive and negative DC transmission wire core integrated cabling structure, and avoids the polarized electric field corrosion effect of the metal armoring layer, and the metal armoring layer of the cable can be manufactured by using a common galvanized mild steel wire. Simultaneously, a dual-core DC high voltage sea electric power cable is more convenient to lay than a single-core DC high voltage sea electric power cable, and occupies less tidal flat laying route resource. The DC high voltage sea electric power cable can adopt a single solid core aluminum conductor, and has low manufacturing cost and better water-tightness.