An electric power transmission cable comprises electric power conductors and a plurality of parallel spiralled armouring wires. The electric power transmission cable comprises along its length a first section (I), a second section (III) and a transition section (II). The transition section (II) is provided between the first section (I) and the second section (III). The plurality of parallel spiralled armouring wires in the first section (I) comprises or consists out of first armouring wires (121). The first armouring wires (121) are carbon steel wires comprising a metallic corrosion resistant coating. At least part of the plurality of parallel spiralling armouring wires in the second section (III) comprise austenitic steel wires (123). In the transition section (II), ends of first armouring wires (121) are individually welded to ends of austenitic steel wires (123) of the second section (III). The transition section (II) starts at the first weld (137) between a first armouring wire (121) and an austenitic steel wire (123). The transition section (II) ends at the last weld (130) between a first armouring wire (121) and an austenitic steel wire (123). The transition section (II) is at least 10 meter long.

An electric power transmission cable comprises electric power conductors and a plurality of parallel spiralled armouring wires. The electric power transmission cable comprises along its length a first section (I), a second section (III) and a transition section (II). The transition section (II) is provided between the first section (I) and the second section (III). The plurality of parallel spiralled armouring wires in the first section (I) comprises or consists out of first armouring wires (121). The first armouring wires (121) are carbon steel wires comprising a metallic corrosion resistant coating. At least part of the plurality of parallel spiralling armouring wires in the second section (III) comprise austenitic steel wires (123). In the transition section (II), ends of first armouring wires (121) are individually welded to ends of austenitic steel wires (123) of the second section (III). The transition section (II) starts at the first weld (137) between a first armouring wire (121) and an austenitic steel wire (123). The transition section (II) ends at the last weld (130) between a first armouring wire (121) and an austenitic steel wire (123). The transition section (II) is at least 10 meter long.

A water blocking layer/sheathing is provided for subsea power cables made from a CuNiSi-alloy.

A water blocking layer/sheathing is provided for subsea power cables made from a CuNiSi-alloy.

A submarine power cable is provided having stranded conductor(s) and an insulation system, each individual stranded conductor, at given intervals, being compressed across an area to form a plurality of watertight partitions along a length of the of the submarine power cable. A method provides a plurality of watertight partitions along a length of the submarine power cable. The method includes, at a given point, arranging a compression tool around an outer circumference of the stranded conductor, using the compression tool to compress the stranded conductor, releasing the compression tool from the stranded conductor, and repeating the compression at a number of different points and using the compression tool to compress the stranded conductor at each of these points, thereby forming a plurality of watertight partitions along the length of the submarine power cable.

A submarine power cable is provided having stranded conductor(s) and an insulation system, each individual stranded conductor, at given intervals, being compressed across an area to form a plurality of watertight partitions along a length of the of the submarine power cable. A method provides a plurality of watertight partitions along a length of the submarine power cable. The method includes, at a given point, arranging a compression tool around an outer circumference of the stranded conductor, using the compression tool to compress the stranded conductor, releasing the compression tool from the stranded conductor, and repeating the compression at a number of different points and using the compression tool to compress the stranded conductor at each of these points, thereby forming a plurality of watertight partitions along the length of the submarine power cable.

Process for manufacturing a power cable includes: providing a power cable core having an electric conductor; providing a copper foil; providing a protective strip over the power cable core, the protective strip having a radially inner and outer surface and being made of copper with a coating; folding the copper foil around the power cable core so as to bring two longitudinal copper foil rims to contact one to the other; welding the two contacted longitudinal copper foil rims thus obtaining a copper sheath in form of a tube with a welding seam; reducing the diameter of the copper sheath to put it into direct contact with the power cable core and the protective strip; heating the protective strip and the copper sheath at a temperature higher than the melting temperature of the coating of the strip so that the coating fuses in the welding seam.

Process for manufacturing a power cable includes: providing a power cable core having an electric conductor; providing a copper foil; providing a protective strip over the power cable core, the protective strip having a radially inner and outer surface and being made of copper with a coating; folding the copper foil around the power cable core so as to bring two longitudinal copper foil rims to contact one to the other; welding the two contacted longitudinal copper foil rims thus obtaining a copper sheath in form of a tube with a welding seam; reducing the diameter of the copper sheath to put it into direct contact with the power cable core and the protective strip; heating the protective strip and the copper sheath at a temperature higher than the melting temperature of the coating of the strip so that the coating fuses in the welding seam.

An electric-submersible-pump composite duct cable is provided and includes a steel tube shell and an isolation layer. The isolation layer covers the outer circumferential surface of an ethylene-propylene jacket. The steel tube shell covers the outer circumferential surface of the isolation layer. Multiple signal cable assemblies and multiple injection agent tubes are arranged inside the isolation layer. Each signal cable assembly and each injection agent tube are in staggered arrangement at the internal center of the ethylene-propylene jacket. A manufacturing method of the electric-submersible-pump composite duct cable mainly includes two steps of manufacturing the isolation layer and machining the steel tube shell.

Aggregated, submarine cable system information is securely stored, accessed and managed. Security is assured through the use of multi-factor authentication that is compliant with National Institutes of Standards And Technology and US. Government Defense Federal Acquisition Regulation requirements. Further, real-time audit logs are generated as end-users access controlled unclassified information.