The present invention relates to a power cable. More particularly, the present invention relates to a power cable which is, when compared to the existing power cables, lightweight and includes a watertight layer which improves a corrosion resistance and is effectively suppressed from being peeled since the interlayer adhesiveness thereof is maintained regardless of an externally physical impact and a temperature change.

A high voltage or medium voltage transmission power cable includes a metallic conductor and an insulation system including an electrical insulation layer including a first composite material, and a semiconducting layer including a second composite material. The insulation layer and the semiconducting layer are arranged to surround the conductor. The first composite material in the insulation layer includes a polymer matrix and first inorganic conductive filler particles, wherein the amount of the first inorganic conductive filler particles is from 0.1 to 10 wt-%, based on the total weight of the first composite material, and wherein the first inorganic conductive filler particles are other than carbon black. A method of manufacturing the cable is also disclosed.

The invention relates to power cable polymer composition which comprises a single site polyethylene (SSPE), a power cable, for example, a high voltage direct current (HV DC), a power cable polymer insulation, use of a polymer composition for producing a layer of a power cable, and a process for producing a power cable.

A power cable including: a conductor, an insulation system including: an inner semiconducting layer arranged radially outside the conductor, an insulation layer arranged radially outside the inner semiconducting layer, and an outer semiconducting layer arranged radially outside the insulation layer, and an adhesive layer arranged between the conductor and the inner semiconducting layer, the adhesive layer directly contacting an inner surface of the inner semiconducting layer and/or the adhesive layer directly contacting an outer surface of the conductor.

Low-loss lightweight high-power kilohertz alternating-current high-voltage electrical cables 1 usable in low pressure having a bundle 2 of metallic wires 3 being separated from each other by non-conductor layers 4 provided on the individual metallic wires, wherein the metallic wires 3 alternate between outer positions 5 and inner positions 6 in the bundle along a longitudinal extension 7 of the electrical cable in order to counteract skin effect in the electrical cable bundle 2, as well as enabling counteraction of proximity effect, when in use, an inner semi-conductive layer 8 of broad range temperature rated polymeric material surrounding said bundle 2 of metallic wires 3, and an insulating layer 9 of broad range temperature rated polymeric material surrounding and bonded to the inner semi-conductive layer 5, at least one of the metallic wires 3 being in electric contact with the inner semi-conductive layer 8 as well as a manufacturing method.

A polymer composition comprising: (i) at least 40 wt % LDPE; (ii) a polypropylene homopolymer; and (iii) a random heterophasic polypropylene copolymer.

A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

A power cable with a termination connection box. The power cable includes a conductor, an inner semiconducting layer, an insulating layer, and an outer semiconducting layer which are sequentially formed. The termination connection box includes: a porcelain tube configured to provide an inner space into which an end portion of the power cable from which portions of the outer semiconducting layer, the insulating layer, and the inner semiconducting layer are sequentially removed is inserted; and a reinforcing insulating layer configured to cover an outer side of the insulating layer of the power cable so as to reinforce dielectric strength of a portion of the power cable from which the portion of the outer semiconducting layer is removed and at which an electric field is thus concentrated.

An alternating current (AC) power cable includes a conductor surrounded by at least an inner semiconductive layer including a first semiconductive composition, an insulation layer including a polymer composition, an outer semiconductive layer including a second semiconductive composition, and optionally a jacketing layer including a jacketing composition, in that order. The polymer composition of the insulation layer includes an unsaturated low density polyethylene (LDPE) copolymer of ethylene with one or more polyunsaturated comonomers and a crosslinking agent. The polymer composition of the insulation layer has a dielectric loss expressed as tan (50 Hz) of 12.010.sup.4 or less, when measured at 25 kV/mm and 130 C. according to Test for Tan measurements on 10 kV cables.

A method is provided for applying a field grading layer to a power cable includes preparing a polymer composition having a polymer matrix, at least one conductive filler different from a non-linear conductive organic filler, and at least one crosslinking agent. The method includes extruding the polymer composition into a crosslinkable field grading tape and winding the crosslinkable field grading tape onto a section of power cable in need of field grading. The crosslinkable tape is crosslinked to obtain a field grading layer.