US 12,367,991 B2
AC submarine power cable with reduced losses
Ola Thyrvin, Karlskrona (SE); Andreas Persberg, Karlskrona (SE); Andreas Tyrberg, Lyckeby (SE); and Håkan Sandell, Karlskrona (SE)
Assigned to NKT HV Cables AB, Lyckeby (SE)
Appl. No. 17/757,612
Filed by NKT HV Cables AB, Lyckeby (SE)
PCT Filed Dec. 18, 2020, PCT No. PCT/EP2020/087309
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/123373, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19218059 (EP), filed on Dec. 19, 2019.
Prior Publication US 2023/0019405 A1, Jan. 19, 2023
Int. Cl. H01B 7/20 (2006.01); H01B 7/14 (2006.01); H01B 7/282 (2006.01); H01B 7/288 (2006.01); H01B 9/00 (2006.01)
CPC H01B 7/2825 (2013.01) [H01B 7/14 (2013.01); H01B 7/207 (2013.01); H01B 7/288 (2013.01); H01B 9/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A static AC submarine power cable configured for at least 72 kV operation, comprising:
a power core comprising:
a conductor,
an insulation system surrounding the conductor, the insulation system comprising an inner semiconducting layer arranged radially outside of the conductor, an insulation layer arranged radially outside of the inner semiconducting layer, and an outer semiconducting layer arranged radially outside of the insulation layer,
a smooth metallic water-blocking sheath surrounding the insulation system, the metallic water-blocking sheath comprising austenitic stainless steel, the metallic water-blocking sheath being made from an austenitic stainless-steel sheet that is folded or wrapped around the insulation system and that has facing edges which are welded together,
a swellable semiconductive bedding which is a moisture barrier, the semiconductive beddinq being a semiconductive tape wound around the outer semiconducting layer and arranged between the outer semiconducting layer and the metallic water-blocking sheath, and
a semiconducting polymeric sheath surrounding the metallic water-blocking sheath,
a plurality of armour wires forming an armour layer around the power core, and
an outer serving arranged around the armour layer.