A polymer composition has at least one polypropylene-based thermoplastic polymer material and a dielectric liquid. The dielectric liquid has at least one mineral oil and at least one polar compound of the benzophenone type, acetophenone type or a derivative thereof.

Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.

Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.

Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.

Disclosed are cable types, including a type THHN cable, the cable types having a reduced surface coefficient of friction, and the method of manufacture thereof, in which the central conductor core and insulating layer are surrounded by a material containing nylon or thermosetting resin. A silicone based pulling lubricant for said cable, or alternatively, erucamide or stearyl erucamide for small cable gauge wire, is incorporated, by alternate methods, with the resin material from which the outer sheath is extruded, and is effective to reduce the required pulling force between the formed cable and a conduit during installation.

Power cable having an insulation system comprising at least one layer made of a thermoplastic material based on a polypropylene matrix admixed with a dielectric fluid, the thermoplastic material having a melting enthalpy of from 15 to 50 J/g and the polypropylene matrix being made of a material selected from: a heterophasic ethylene-propylene copolymer (a) having a melting enthalpy of from 15 to 50 J/g; or an intimate admixture of (a) and a propylene homopolymer or an ethylene propylene copolymer (b) having a melting enthalpy greater than 50 J/g. The cable is particularly suitable for current transport at high voltage or extra high voltage.

The invention relates to a process for the manufacture of an electric cable comprising an extruded thermoplastic layer obtained from a composition comprising at least one dielectric liquid and at least one thermoplastic polymer chosen from a propylene homopolymer and copolymer, and also to a cable obtained by said process.

An electrical cable (100, 101) includes at least one elongated electrical conductor (1), at least one protective element (4, 41, 42) surrounding the elongated electrical conductor (1), and at least one filling compound (5) surrounded by said protective element (4, 41, 42). The filling compound (5) has more than 20.0% by weight of a mineral oil, relative to the total weight of the filling compound, and at least one nanofiller.

A dielectric fluid is provided comprising a natural bio-sourced oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.

A dielectric fluid is provided comprising a natural bio-sourced oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.