Patents Assigned to NKT HV CABLES AB
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Patent number: 11862362Abstract: A multi-phase submarine power cable including: a plurality of power cores arranged in a stranded configuration, and a curvature sensor including: an elastic elongated member, and a plurality of Fibre Bragg Grating, FBG, fibres, each FBG fibre extending axially along the elongated member at a radial distance from the centre of the elongated member; wherein the elongated member extends between the stranded power cores along a central axis of the multi-phase submarine power cable.Type: GrantFiled: October 19, 2021Date of Patent: January 2, 2024Assignee: NKT HV Cables ABInventors: Andreas Tyrberg, Patrik Holmberg, Petrus Althini
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Patent number: 11652327Abstract: A method for improving the properties of a joint between two cable ends having obtaining two cable ends, having uncovered conductors being joined in a connection zone, each cable end also including an uncovered insulation zone including uncovered insulation formed as a cone adjacent the uncovered conductor, covering the conductors with an additional insulation layer, measuring the additional insulation layer and the cones, determining the geometry of the cones and the additional insulation layer based on the measurements, determining a deviation of the geometry from a desired geometry of the cones and the additional insulation layer, where the desired geometry includes a smooth transition between two zones, determining, based on the deviation determination, material to be removed from the cones and the additional insulation layer achieving the desired geometry, and removing the material from the cones and the additional insulation layer.Type: GrantFiled: September 14, 2021Date of Patent: May 16, 2023Assignee: NKT HV Cables ABInventor: Kristian Gustafsson
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Patent number: 11502498Abstract: A power cable termination system including: a power cable having a power cable conductor and a power cable insulation system configured to electrically insulate the power cable conductor, a termination cable having a termination cable conductor and a termination cable insulation system configured to electrically insulate the termination cable insulation system, wherein the termination cable is at least one order of magnitude shorter than the power cable, wherein the termination cable conductor has an electrical resistance which is lower than the electrical resistance of the power cable conductor and/or the termination cable insulation system has a higher insulation resistance per unit length than the power cable insulation system, a joint configured to join the power cable and the termination cable, and a cable termination device configured to terminate the termination cable.Type: GrantFiled: June 4, 2020Date of Patent: November 15, 2022Assignee: NKT HV Cables ABInventor: Fredrik Fälth
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Patent number: 11467224Abstract: A power cable measurement system for facilitating measurements of a power cable terminated at an electrical substation and connected to an overhead busbar, including: a first movable structure provided with a first busbar connector, and a measurement equipment connector device configured to be electrically connected to the first busbar connector and to measurement equipment, wherein the first movable structure is configured to be maneuvered between a default lowered position in which the first busbar connector is disconnected from the overhead busbar, and a temporary elevated position in which the first busbar connector is set in electrical connection with the overhead busbar to provide an electrical connection between the overhead busbar and the measurement equipment connector device.Type: GrantFiled: November 6, 2019Date of Patent: October 11, 2022Assignee: NKT HV Cables ABInventor: Thomas Worzyk
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Patent number: 11437166Abstract: A high voltage DC power cable designed for voltages of 320 kV or higher, including: a multi-wire conductor, an inner semiconducting layer arranged around the multi-wire conductor, the inner semiconducting layer forming a screen layer for the multi-wire conductor, a solid insulation system arranged around the inner semiconducting layer, and a water-blocking compound configured to restrict water migration into the high voltage DC power cable.Type: GrantFiled: May 20, 2020Date of Patent: September 6, 2022Assignee: NKT HV Cables ABInventors: Kristian Gustafsson, Amirhossein Abbasi, Tommy Johansson
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Patent number: 11346744Abstract: A method for fatigue-monitoring of a submarine cable during off-shore jointing or reparation includes: a) determining a plurality of curvature values concerning a curvature of the submarine cable at different points in time during the off-shore jointing or reparation, b) determining a plurality of strain ranges of the submarine cable based on the plurality of curvature values, and c) determining a fatigue damage of the submarine cable based on the plurality of strain ranges.Type: GrantFiled: November 7, 2018Date of Patent: May 31, 2022Assignee: NKT HV Cables ABInventor: Andreas Tyrberg
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Patent number: 11232886Abstract: A submarine power cable having: a power core including a conductor, wherein the conductor has a conductor joint in a joint region of the power core, a main armor layer including a plurality of main armor wires arranged around the power core and extending in the axial direction of the power core, and a joint reinforcement armor layer including a plurality of joint reinforcement armor wires axially locked relative to the main armor wires, wherein the joint reinforcement armor layer is provided only in the joint region and arranged layered with the main armor layer, the joint reinforcement armor layer and the main armor layer thereby forming a dual-layer armor only in the joint region.Type: GrantFiled: October 21, 2019Date of Patent: January 25, 2022Assignee: NKT HV Cables ABInventors: Andreas Tyrberg, Krister Nordlund
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Patent number: 11201458Abstract: A joint, termination or cross-connection arrangement for a cable includes a first cable and a protective casing. The arrangement further includes a transition sleeve. The transition sleeve, at a first longitudinal end surface thereof, is welded to the metallic sheath of the first cable around the whole circumference of the metallic sheath. The transition sleeve is furthermore welded to the protective casing around the whole circumference of the transition sleeve. A method of providing such an arrangement includes: welding the transition sleeve, at the first longitudinal end surface, to the metallic sheath of the first cable around the whole circumference of the metallic sheath; and welding the transition sleeve to a first tubular end portion of the protective casing around the whole circumference of the transition sleeve.Type: GrantFiled: May 13, 2016Date of Patent: December 14, 2021Assignee: NKT HV Cables ABInventors: Henrik Ekholm, Johan Jäderberg
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Patent number: 11146032Abstract: A method for improving the properties of a joint between two cable ends having obtaining two cable ends, having uncovered conductors being joined in a connection zone, each cable end also including an uncovered insulation zone including uncovered insulation formed as a cone adjacent the uncovered conductor, covering the conductors with an additional insulation layer, measuring the additional insulation layer and the cones, determining the geometry of the cones and the additional insulation layer based on the measurements, determining a deviation of the geometry from a desired geometry of the cones and the additional insulation layer, where the desired geometry includes a smooth transition between two zones, determining, based on the deviation determination, material to be removed from the cones and the additional insulation layer achieving the desired geometry, and removing the material from the cones and the additional insulation layer.Type: GrantFiled: March 20, 2019Date of Patent: October 12, 2021Assignee: NKT HV Cables ABInventor: Kristian Gustafsson
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Patent number: 11011895Abstract: A pull-in head for a high voltage cable provided with a multi-wire conductor having an end portion which is stepped and tapering, with a layer-by-layer exposure of the wires in the direction towards the end face of the multi-wire conductor, wherein the pull-in head includes: a conductor clamp assembly having a plurality of clamping segments, wherein each clamping segment has an axial first central channel configured to receive the multi-wire conductor, wherein at least some of the clamping segments have mutually differing central channel width and central channel depth dimensions, the clamping segments being configured to be arranged one after the other in an order with a decreasing central channel width and central channel depth dimension, the central channel width and central channel depth dimensions being adapted to the tapering stepped configuration of the multi-wire conductor, whereby the first central channels together form a multi-wire conductor channel which is tapering in an axial direction, and wherType: GrantFiled: May 7, 2018Date of Patent: May 18, 2021Assignee: NKT HV Cables ABInventor: Stefan Hansson
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Patent number: 10872713Abstract: A power cable system including a power cable, and an evaporator pipe assembly extending along the power cable, wherein the evaporator pipe assembly having an inner liquid pipe including a pressurised liquid refrigerant, and an outer gas pipe arranged outside of and coaxially with the inner liquid pipe, wherein the inner liquid pipe is provided with a plurality of openings distributed along its length, and wherein the openings provide fluid communication between the inner liquid pipe and the outer gas pipe, allowing part of the pressurised liquid refrigerant to escape from the inner liquid pipe to the outer gas pipe and evaporate in the outer gas pipe, thereby cooling the power cable.Type: GrantFiled: July 9, 2019Date of Patent: December 22, 2020Assignee: NKT HV Cables ABInventor: Robert Wayne Hobson
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Patent number: 10855063Abstract: A method in the manufacturing of an insulated electric high voltage DC termination or joint includes providing an insulated electric high voltage DC cable including a high voltage DC conductor, a polymer based insulation system surrounding the high voltage DC conductor, the polymer based insulation system including an insulation layer and a semiconducting layer surrounding the insulation layer, and a grounding layer surrounding the semiconducting layer; removing the grounding layer and the semiconducting layer in at least one end portion of the high voltage DC cable, mounting a field grading adapter or joint body in the at least one end portion of the high voltage DC cable; and subjecting the insulation layer of the polymer based insulation system in the at least one end portion of the high voltage DC cable for a heat treatment procedure, while being covered by the mounted field grading adapter or joint body.Type: GrantFiled: January 12, 2018Date of Patent: December 1, 2020Assignee: NKT HV CABLES ABInventors: Carl-Olof Olsson, Markus Saltzer, Anders Lindgren
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Patent number: 10770873Abstract: A process for producing a flexible vulcanized joint between two electric power cables includes the steps of: producing an exposed conductor joint between each end of the two cable ends to be joined; producing an inner semi-conducting layer thereby radially surrounding and covering the exposed conductor joint; winding an insulation tape including an organic peroxide around the inner semi-conducting layer thereby radially surrounding and covering the inner semi-conducting layer; curing the insulation tape to produce an insulation layer; and producing an outer semi-conducting layer thereby radially surrounding and covering the insulation layer. The step of winding the insulation tape around the inner semi-conductor layer is performed under an oxygen-free atmosphere. The present invention also provides a flexible vulcanized joint produced by this process, and an electric power cable including such a joint.Type: GrantFiled: November 23, 2015Date of Patent: September 8, 2020Assignee: NKT HV Cables ABInventors: Hossein Ghorbani, Eric Rèbillard, Svetlana Zlatkovic, Sofie Lindahl
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Patent number: 10679772Abstract: An electric power cable and a process for the production of the cable including a metal conductor and an electric insulation system surrounding the conductor coaxially and radially outwards of the conductor having improved electric properties. The insulation system includes an inner semi-conducting layer surrounded radially outwards by an insulation layer and wherein the insulation layer is surrounded radially outwards by an outer semi-conducting layer. The electric power cable further includes an inner water blocking material arranged in the conductor and/or to surround the conductor radially outwards and an outer water blocking material arranged radially outwards from the insulation system. An inner barrier layer is arranged as a diffusion hindering layer between the inner water blocking material and the insulation system and an outer barrier layer is arranged as a diffusion hindering layer between the insulation system and the outer water blocking material.Type: GrantFiled: June 23, 2015Date of Patent: June 9, 2020Assignee: NKT HV Cables ABInventors: Hossein Ghorbani, Peter Sunnegårdh, Birgitta Källstrand, Carl-Olof Olsson, Ulf Nilsson, Per-Ola Hagstrand, Villgot Englund, Emy Silfverberg, Niklas Thorn
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Patent number: 10662323Abstract: The present invention relates to a polymer composition suitable for the manufacture of an electrical insulation layer for cables having superior mechanical and electrical properties and being environmentally friendly, to a cable comprising said polymer composition as well as to the use of the polymer composition as an electrical insulation layer in cables.Type: GrantFiled: August 12, 2013Date of Patent: May 26, 2020Assignee: NKT HV CABLES ABInventors: Chau-Hon Ho, Cherif Ghoul, Gustavo Dominguez, Anneli Jedenmalm, Andreas Friberg, Andrej Krivda, Lei Xie, Andreas Farkas
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Patent number: RE48918Abstract: A power cable termination device for a high voltage direct current gas-insulated switchgear including: an outer housing made of an electrically conducting material, connectable to the switchgear; a terminal portion of a power cable, the power cable including an electrical conductor, a circumferential electrically insulating layer, and a circumferential conductive shield which is stripped off along a first part of the power cable; an electric field grading system including a resistive field grading material layer arranged circumferentially around the power cable to axially cover the edge of the conductive shield where the conductive shield is terminated, the resistive field grading material layer being in electrical contact therewith, and a connection device connectable to the gas-insulated switchgear and arranged to provide mechanical support and electrical contact with the gas-insulated switchgear.Type: GrantFiled: March 6, 2020Date of Patent: February 1, 2022Assignee: NKT HV Cables ABInventors: Fredrik Fälth, Markus Saltzer, Christian Sonehag, Tomas Ahlberg, Linus Adolfsen, Anders Lindgren