Electrical conductors and processes for making and using same. In some examples, the electrical conductors can include an inner electrically conductive element, which can define a central longitudinal axis. A first polymer layer can be disposed circumferentially about the inner electrically conductive element. A plurality of electrical conductor segments can be disposed about the first polymer layer and spaced around the central longitudinal axis. A second polymer layer can be disposed between the electrical conductor segments. The second polymer layer and the electrical conductor segments together can define a substantially annular cross-sectional area and an outer perimeter surface. An electrical insulator can be disposed about the outer perimeter surface defined by the second polymer layer and the electrical conductor segments.

A system for transmission of power offshore comprises two or more power stations operably connected with a high voltage cable system. The high voltage cable system may comprise a dynamic, dry type high voltage submarine cable of varying length configured to transmit at least about 45 megawatts of power. In some cases the dynamic, dry type high voltage submarine cable comprises a first end connected to an offshore power station and second end connected to a static submarine cable system which is connected to an onshore power station. The systems may facilitate transmission of power for applications such as compressing and/or pumping subsea natural gas in deep water.

A method of manufacturing a dynamic power cable (1) includes providing a cable core (2) made of an electrical conductor (3) and an electrically insulating layer (4) arranged radially outside of the electrical conductor (3). A metallic sheet (7) is wrapped radially around the cable core (2) the metallic sheet (7) having a copper-nickel alloy. Opposing edges of the metallic sheet (7) are welded together to form a continuous water barrier layer (5) around the cable core (2). The welding (8) is performed by autogenous welding.

An electric cable includes at least one electric wire, and a plurality of string-shaped bodies each extending in a longitudinal direction of the electric cable and twisting with one another around the at least one electric wire being a core. The plurality of string-shaped bodies has connection parts twisting with one another excluding the at least one electric wire. The connection parts are connected to a frame of an underwater robot.

An cable that is flexible and watertight by means of a metallic water resistant barrier has at least two protective layers 20, 30 of metal tape wound to a cable core 10 with small gaps 50 between each turn of the tape, and where each layer is displaced 50% relative to each other thus covering the gaps in the layers 20, 30, and where the gaps 50 are filled with a water resistant material.

A dynamic submarine power cable including a first conductor, a first insulation system layer, a first sheath, and a first screen layer arranged between the first insulation system layer and the first sheath. The first screen layer includes a plurality of first screen wires each having a first diameter and a plurality of first polymer wires each having a second diameter which is larger than the first diameter. The first screen wires and the first polymer wires are arranged in a helical manner around the first insulation system layer. The first screen wires and the first polymer wires are arranged alternatingly along the periphery of the first insulation system layer in any cross section. A radial distance between the central axis of any of the first screen wires and the central axis of the first conductor is less than a radial distance between the central axis of any of the first polymer wires and the central axis of the first conductor.

Protrusion portions and recess portions are formed on a metal layer. The protrusion portions are repeatedly formed in a lattice shape at a pitch of P. Similarly, the recess portions are repeatedly formed in the lattice shape at the pitch of P. The protrusion portions and the recess portions are arranged in the same arrangement direction and arranged shifted to each other by half the pitch in the arrangement direction. The protrusion portions and the recess portions are formed independently of each other without contacting each other. In order to allow a multilayer tape to reliably follow the bending deformations of a power cable (submarine cable) in all directions, in an arbitrary cross-section taken in the longitudinal direction of the multilayer tape (in the axial direction of an impermeable layer), the protrusion portions or the recess portions are necessarily arranged at predetermined intervals.

An electrically conductive wire for deep water transmission includes a first wire portion and a second wire portion. The first wire portion makes up one end of the wire, and is formed from a first metal. The second wire portion is formed from a second metal. The first metal has a higher ultimate tensile strength than the second metal. The first wire portion is used to support the weight of the second wire portion, thereby allowing the electrically conductive wire to be used in underwater or subsea power cables which may be freely suspended from their origin for providing electricity to electrical devices located in deep water or ultra-deep water.

A submarine power cable system including: a dynamic submarine power cable having an element with a first axial section and a second axial section which are joined at a joint location; and a bend restriction device arranged around the dynamic submarine power cable, wherein the bend restriction device extends axially over the joint location, and wherein the bend restriction device is arranged to restrict bending of the dynamic submarine power cable at the joint location.

A bend stiffener assembly for coupling a tubular member includes a nonmetallic flange member having a central bore for receiving a tubular member and an elastomeric member coupled to the flange member and having a central bore for receiving the tubular member, wherein the elastomeric member is configured to provide a bending resistance to a tubular member extending therethrough.