An insert for constructing a cable accessory used to inject a fluid into a cable. The cable accessory has an outer body defining an interior configured to house a conductor of the cable. The outer body includes an injection port with an internal channel configured to receive the fluid. The insert has first and second portions. The first portion is configured to line a portion of the interior of the cable accessory. The first portion has a first through-channel configured to allow the conductor of the cable to pass at least partway therethrough. The second portion is configured to line the internal channel of the injection port. The second portion has a second through-channel in fluid communication with the first through-channel. The insert is less permeable to the fluid than the outer body of the cable accessory. The insert may be molded into the outer body.

The present invention related to an electrical element (100, 101, 102) including an electrically conductive element (3, 5, 10, 31, 32, 51), characterized in that the electrical element also includes a first layer (1) of a polymer material with electrical conductivity gradient obtained from a polymer composition including at least one polymer and conductive carbonaceous fillers.

Exemplary embodiments are disclosed of electrically insulated conductors. In exemplary embodiments, an electrically insulated conductor comprises an electrically conductive core and one or more electrically nonconductive layers. The one or more electrically nonconductive layers include adhered end portions parallel to and/or longitudinally extending at least partially along the length of the electrically conductive core. The one or more electrically nonconductive layers are at least partially along the perimeter of the electrically conductive core.

Coated conductors including a conductive core at least partially surrounded by a polymeric coating. The polymeric coating has an -olefin based polymer and an -olefin based block composite. The -olefin block composite has block copolymers having hard segments and soft segments.

Polymeric compositions comprising a high-density polyethylene, a crystalline polypropylene, and an olefin block composite. Optical cable components fabricated from an extrudable polymeric composition of high-density polyethylene, a crystalline polypropylene, and an olefin block composite. Optionally, the polymeric composition can further comprise a nucleating agent. The polymeric composition may also contain one or more additives. The optical fiber cable components can be selected from buffer tubes, core tubes, and slotted core tubes, among others.

A cross-linked polyethylene composition for a power cable insulator including (A) 100 parts by weight of a polyethylene base resin, (B) 0.1 to 0.6 parts by weight of a hindered phenol-based antioxidant, (C) 1 to 4 parts by weight of a crosslinking agent, (D) 0.2 to 1.0 parts by weight of magnesium oxide and (E) 0.1 to 1.0 parts by weight of a scorch inhibitor, which advantageously exhibits superior resistance to water tree generated when a power cable insulator is exposed to outside water and electric field, and superior electrical insulation characteristics.

The present invention relates to stabilising compositions, particularly stabilising compositions which can be used to stabilise insulation or semi-conductive compositions, such as are used for electrically insulating wires and cables. The stabilising composition comprises: a first stabilising component comprising at least one fully hindered phenolic antioxidant; a second stabilising component comprising at least one partially hindered phenolic antioxidant; and a third stabilising component comprising at least one sulphur-containing antioxidant.

A cable includes at least one electrical conductor and at least one electrically insulating layer surrounding the electrical conductor, wherein the at least one electrically insulating layer includes: (a) a thermoplastic polymer material selected from: at least one copolymer (i) of propylene with at least one olefin comonomer selected from ethylene and an a-olefin other than propylene, the copolymer having a melting point greater than or equal to 130 C. and a melting enthalpy of 20 J/g to 90 J/g; a blend of at least one copolymer (i) with at least one copolymer (ii) of ethylene with at least one -olefin, the copolymer (ii) having a melting enthalpy of 0 J/g to 70 J/g; a blend of at least one propylene homopolymer with at least one copolymer (i) or copolymer (ii); at least one of copolymer (i) and copolymer (ii) being a heterophasic copolymer; (b) at least one dielectric fluid intimately admixed with the thermoplastic polymer material; and (c) at least one water tree retardant selected from ethoxylated fatty acids and amide derivatives thereof.

An umbilical for use in the offshore production of hydrocarbons, the umbilical comprising a plurality of functional elements contained within an outer sheath, at least one of said functional elements comprising a multicore electric cable, said multicore electric cable comprising a plurality of insulated electric conductors electrically insulated from each other and assembled together in a helical or S/Z manner, said multicore electric cable further comprising a protective polymer sheath surrounding said plurality of insulated electric conductors, said multicore electric cable further comprising a tubular metallic layer located inside said protective polymer sheath and surrounding said plurality of insulated electric conductors.

An insulated wire having a conductor coated with at least one layer of an insulating material, and having at least one layer of a bubble layer in a thickness direction in a coating layer, wherein the insulated wire has a part in which a thickness is small in a length direction or a circumferential direction in an identical coating layer; a method of producing the same; a method of producing a stator for a rotating electrical machine; and the rotating electrical machine.