Provided is an ultra-high-voltage direct-current (DC) power cable system. Specifically, the present disclosure relates to an ultra-high-voltage DC power cable system capable of simultaneously preventing or minimizing electric field distortion, a reduction of DC dielectric strength, and a reduction of impulse breakdown strength due to the accumulation of space charges in an insulating layer of a cable and an insulating material of an intermediate connection part.

The present disclosure relates to a power cable joint system capable of minimizing expansion, deformation or damage of a metal sheath restoration layer, which is formed of a material such as lead sheath, due to internal expansion due to heat generated in an intermediate connection part of the power cable joint system.

A spliced cable including: a first shielded wire, wherein the first shielded wire comprises at least one conductor and a first shield layer having an outer surface coated with a first outer sheath; a second shielded wire, wherein the second shielded wire comprises at least one conductor and a second shield layer having an outer surface coated with a second outer sheath; a third shielded wire, wherein the third shielded wire comprises at least one conductor and a third shield layer having an outer surface coated with a third outer sheath; wherein the first conductor is electrically connected to the second conductor and to the third conductor; and a flexible shield tube, wherein the flexible shield tube comprises a first portion and a second portion longitudinally adjacent or spaced from the first portion.

A wire harness assembly including a first, second, and third shielded wire cable, each having a core conductor surrounded by a shield conductor which is surrounded by a insulative jacket. Portions of the core conductors are sonically welded to one another. The assembly also includes a flexible insulative layer wrapped about the sonically welded core portions, a flexible conductive layer wrapped about the flexible insulative layer and exposed shield portions, and a section of heat shrink tubing in which the flexible conductive layer and portions of the insulative jackets are enclosed. The assembly further including an insulative housing having a longitudinal cavity extending therethrough in which the section of heat shrink tubing, the flexible conductive layer, and portions of the insulative jackets are disposed.

A method for creating a flexible transition joint between HVDC-MI cables having different diameters. The central wires of the conductors are thermally joined by a conical connection piece. The strands of the layers of stranded wires surrounding the central wires are rewound, cut and thermally joined along their respective lay lengths. The stranded are sanded/ground along the lay length of the strands to form a smooth uniform transition having the same slope as the conical connection piece. A paper lapping machine is used to form an insulation patch over the transition joint.

The present disclosure relates to a power cable and an intermediate connection structure, for connection thereof, which is capable of preventing the concentration of stress on a soldered part, which is configured to join a metal sheath of the power cable and a metal sheath restoration layer of the intermediate connection structure while ensuring airtight or watertight sealing therebetween, preventing deformation of or damage to the soldered part due to stress applied thereto, and minimizing thermal history in the power cable during the formation of the soldered part.

The present disclosure relates to a power cable and an intermediate connection structure, for connection thereof, which is capable of preventing the concentration of stress on a soldered part, which is configured to join a metal sheath of the power cable and a metal sheath restoration layer of the intermediate connection structure while ensuring airtight or watertight sealing therebetween, preventing deformation of or damage to the soldered part due to stress applied thereto, and minimizing thermal history in the power cable during the formation of the soldered part.

A method of building an insulation system around an axial section of a conductor of a power cable, the method including: a) providing a power cable including a conductor and an insulation system arranged around the conductor, the insulation system including insulation system layers, including an inner semiconducting layer arranged around the conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, wherein the power cable includes an axial section between a first insulation system section and a second insulation system section of the insulation system which at least is without an outer semiconducting layer, b) winding a tape around the conductor along the axial section in a plurality of layers to form a plurality of layers of tape connecting with the first insulation system section and the second insulation system section, and c) heating the plurality of layers of tape to melt and fuse the plurality of layers of tape to form an insulation system layer between the first insulation system section and the second insulation system section, wherein the tape has a width defined by a distance between lateral edges, wherein the tape has a mid-section between its lateral edges, wherein in the mid-section the tape has a largest thickness, and wherein the thickness of the tape decreases from the mid-section towards both lateral edges.

A seal assembly for a longitudinally extending cable comprises a gland shiftable between an unsealed position and a sealed position, and a receiver including an inner portal-defining wall that defines a portal configured to receive at least a portion of the cable. The gland is at least in part received within the portal when in the sealed position. The receiver defines a radially extending, annular receiver face. The gland includes a tapered body configured to circumscribe the cable. The gland further includes a head including an outwardly extending flange. The flange presents a radially extending, annular seal face that engages the receiver face when the gland is in the sealed position. The tapered body presents an axially tapering outer wall that is spaced in its entirety radially inwardly from the portal-defining wall when the gland is in the sealed position, such that an annular buffer is defined therebetween.

A seal assembly for a longitudinally extending cable comprises a gland shiftable between an unsealed position and a sealed position, and a receiver including an inner portal-defining wall that defines a portal configured to receive at least a portion of the cable. The gland is at least in part received within the portal when in the sealed position. The receiver defines a radially extending, annular receiver face. The gland includes a tapered body configured to circumscribe the cable. The gland further includes a head including an outwardly extending flange. The flange presents a radially extending, annular seal face that engages the receiver face when the gland is in the sealed position. The tapered body presents an axially tapering outer wall that is spaced in its entirety radially inwardly from the portal-defining wall when the gland is in the sealed position, such that an annular buffer is defined therebetween.