An electrical lead has a lead core composed of a plurality of individual conduction elements and surrounded by a jacket of multiple plies that are formed by extrusion. An inner ply is formed of a swellable material. An outer ply surrounds the inner ply. Upon penetration of moisture, the swellable material of the inner ply swells up and fills out interstices between the conduction elements.

An electrical lead has a lead core composed of a plurality of individual conduction elements and surrounded by a jacket of multiple plies that are formed by extrusion. An inner ply is formed of a swellable material. An outer ply surrounds the inner ply. Upon penetration of moisture, the swellable material of the inner ply swells up and fills out interstices between the conduction elements.

An electric power cable and a process for the production of the cable including a metal conductor and an electric insulation system surrounding the conductor coaxially and radially outwards of the conductor having improved electric properties. The insulation system includes an inner semi-conducting layer surrounded radially outwards by an insulation layer and wherein the insulation layer is surrounded radially outwards by an outer semi-conducting layer. The electric power cable further includes an inner water blocking material arranged in the conductor and/or to surround the conductor radially outwards and an outer water blocking material arranged radially outwards from the insulation system. An inner barrier layer is arranged as a diffusion hindering layer between the inner water blocking material and the insulation system and an outer barrier layer is arranged as a diffusion hindering layer between the insulation system and the outer water blocking material.

An electric power cable and a process for the production of the cable including a metal conductor and an electric insulation system surrounding the conductor coaxially and radially outwards of the conductor having improved electric properties. The insulation system includes an inner semi-conducting layer surrounded radially outwards by an insulation layer and wherein the insulation layer is surrounded radially outwards by an outer semi-conducting layer. The electric power cable further includes an inner water blocking material arranged in the conductor and/or to surround the conductor radially outwards and an outer water blocking material arranged radially outwards from the insulation system. An inner barrier layer is arranged as a diffusion hindering layer between the inner water blocking material and the insulation system and an outer barrier layer is arranged as a diffusion hindering layer between the insulation system and the outer water blocking material.

A static AC submarine power cable configured for at least 72 kV operation including: a power core including: a conductor, an insulation system surrounding the conductor, and a smooth metallic water-blocking sheath surrounding the insulation system, wherein the metallic water-blocking sheath includes stainless steel.

A static AC submarine power cable configured for at least 72 kV operation including: a power core including: a conductor, an insulation system surrounding the conductor, and a smooth metallic water-blocking sheath surrounding the insulation system, wherein the metallic water-blocking sheath includes stainless steel.

A power cable arrangement (28,40), having a power core with one or more conductors, an intermediate layer disposed about the power core, a water barrier layer tightly arranged about the intermediate layer, and a moisture ingress detection device (10,29) arranged between the water barrier layer and the intermediate layer in direct contact with the water barrier layer. The moisture ingress detection device has an elongated optical fiber (12) surrounded by a water-swellable material (14,32), the swellable material arranged to expand upon contact with moisture and exert a pressure on the underlying optical fiber sufficient to cause an observable change in the attenuation and/or propagation characteristics of the optical fiber.