# US 12,224,542 B2 · Power cable accessory assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,542 B2 - Document ID: US12224542B2 - Status: Granted - Kind: B2 - Application number: 18/327,940 - Filed: 2023-06-02 - Published: 2023-12-14 - Granted: 2025-02-11 - Earliest claimed: 2022-06-10 - Assignees: NKT HV Cables AB - Applicants: NKT HV Cables AB - Inventors: Gustaf Larsson - Web page: https://patentgrep.com/patent/US12224542B2 ## CPC - H01R 4/70: Insulation of connections (end caps H01R4/22) - H02G 15/184: with devices for relieving electrical stress - H01B 9/00: Power cables - H02G 1/14: for joining or terminating cables - H02G 15/02: Cable terminations (for gas- or oil-filled cables H02G15/22) - H02G 15/103: with devices for relieving electrical stress - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract A power cable accessory assembly including: a first power cable including: first conductor, and a first electrical insulation layer arranged around the first conductor, wherein the first electrical insulation layer includes a first insulation groove extending circumferentially along an outer surface of the first electrical insulation layer, a connection sleeve including: a first axial end opening receiving an end portion of the first conductor protruding axially from the first electrical insulation layer, and a first locking sleeve groove extending circumferentially along an outer surface of the connection sleeve; and a first locking sleeve including: a first radially inwards extending flange engaging with the first insulation groove and a second radially inwards extending flange engaging with the first locking sleeve groove to restrict axial movement between the first electrical insulation layer and the connection sleeve, wherein the first radially inwards extending flange has a first radial dimension that decreases gradually in an axial direction towards the connection sleeve, and wherein the first insulation groove has a second radial dimension that decreases gradually in the axial direction towards the connection sleeve. ## Claims ### Claim 1 A power cable accessory assembly comprising: a first power cable including: first conductor, and a first electrical insulation layer arranged around the first conductor, wherein the first electrical insulation layer includes a first insulation groove extending circumferentially along an outer surface of the first electrical insulation layer; a connection sleeve including: a first axial end opening receiving an end portion of the first conductor protruding axially from the first electrical insulation layer, and a first locking sleeve groove extending circumferentially along an outer surface of the connection sleeve; and a first locking sleeve including: a first radially inwards extending flange engaging with the first insulation groove and a second radially inwards extending flange engaging with the first locking sleeve groove to restrict axial movement between the first electrical insulation layer and the connection sleeve, wherein the first radially inwards extending flange has a first radial dimension that decreases gradually in an axial direction towards the connection sleeve, and wherein the first insulation groove has a second radial dimension that decreases gradually in the axial direction towards the connection sleeve; wherein the first radially inwards extending flange has a surface defines the gradually decreasing first radial dimension, wherein in a longitudinal section of the first locking sleeve the surface defines an axis that intersects a longitudinal axis of the first locking sleeve with an angle in a range of 15-80 degrees. ### Claim 2 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first radial dimension that decreases gradually decreases at a first linear rate. ### Claim 3 (depends on 2) The power cable accessory assembly as claimed in claim 2, wherein the second radial dimension that decreases gradually decreases at the first linear rate. ### Claim 4 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first radially inwards extending flange has a maximal radial dimension that is greater than a maximal radial dimension of the second radially inwards extending flange. ### Claim 5 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first radial dimension decreases gradually in an axial direction towards the connection sleeve only for an axial length that is between ⅓ and ⅔ of the largest radial thickness of the first electrical insulation layer outside the first insulation groove. ### Claim 6 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first electrical insulation layer has a smallest radial first insulation thickness in the first insulation groove, and a largest radial thickness outside the first insulation groove, wherein the smallest radial first insulation thickness is in a range of ⅓ to ½ of the largest radial thickness of the first electrical insulation layer. ### Claim 7 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first electrical insulation layer includes a thermosetting polymer. ### Claim 8 (depends on 1) The power cable accessory assembly as claimed in claim 1, wherein the first radially inwards extending flange has a far edge relative to the connection sleeve, the far edge being rounded or bevelled. ### Claim 9 (depends on 1) The power cable accessory assembly as claimed in claim 1, forming a power cable termination. ### Claim 10 A power cable accessory assembly comprising: a first power cable including: first conductor, and a first electrical insulation layer arranged around the first conductor, wherein the first electrical insulation layer includes a first insulation groove extending circumferentially along an outer surface of the first electrical insulation layer; a connection sleeve including: a first axial end opening receiving an end portion of the first conductor protruding axially from the first electrical insulation layer, and a first locking sleeve groove extending circumferentially along an outer surface of the connection sleeve; and surface of the connection sleeve; and a first locking sleeve including: a first radially inwards extending flange engaging with the first insulation groove and a second radially inwards extending flange engaging with the first locking sleeve groove to restrict axial movement between the first electrical insulation layer and the connection sleeve, wherein the first radially inwards extending flange has a first radial dimension that decreases gradually in an axial direction towards the connection sleeve, and wherein the first insulation groove has a second radial dimension that decreases gradually in the axial direction towards the connection sleeve; wherein the power cable accessory assembly forms a power cable joint, the power cable accessory assembly comprising: a second power cable including: second conductor, and a second electrical insulation layer arranged around the second conductor, wherein the second electrical insulation layer includes a second insulation groove extending circumferentially along an outer surface of the second electrical insulation layer, wherein the connection sleeve is arranged axially between the first electrical insulation layer and the second electrical insulation layer, and includes: a second axial end opening receiving an end portion of the second conductor protruding axially from the second electrical insulation layer, a second locking sleeve groove extending circumferentially along an outer surface of the connection sleeve; and a second locking sleeve including a third radially inwards extending flange engaging with the second insulation groove and a fourth radially inwards extending flange engaging with the second locking sleeve groove to restrict axial movement between the second electrical insulation layer and the connection sleeve, and wherein the third radially inwards extending flange has a third radial dimension that decreases gradually in an axial direction towards the connection sleeve, and wherein the second insulation groove has a fourth radial dimension that decreases gradually in the axial direction towards the connection sleeve. ### Claim 11 (depends on 10) The power cable accessory assembly as claimed in claim 10, wherein the third radial dimension that decreases gradually decreases at a second linear rate. ### Claim 12 (depends on 11) The power cable accessory assembly as claimed in claim 11, wherein the fourth radial dimension that decreases gradually decreases at the second linear rate. ### Claim 13 (depends on 10) The power cable accessory assembly as claimed in claim 10, wherein the third radially inwards extending flange has a surface that defines the gradually decreasing third radial dimension, wherein in a longitudinal section of the second locking sleeve the surface defines an axis that intersects a longitudinal axis of the second locking sleeve with an angle in a range of 15-80 degrees. ### Claim 14 (depends on 10) The power cable accessory assembly as claimed in claim 10, wherein the third radial dimension decreases gradually in an axial direction towards the connection sleeve only for an axial length that is between ⅓ and ⅔ of the largest radial thickness of the second electrical insulation layer outside the second insulation groove. ### Claim 15 A power cable accessory assembly comprising: a first power cable including: first conductor, and a first electrical insulation layer arranged around the first conductor, wherein the first electrical insulation layer includes a first insulation groove extending circumferentially along an outer surface of the first electrical insulation layer; a connection sleeve including: a first axial end opening receiving an end portion of the first conductor protruding axially from the first electrical insulation layer, and a first locking sleeve groove extending circumferentially along an outer surface of the connection sleeve; and a first locking sleeve including: a first radially inwards extending flange first engaging with the first insulation groove and a second radially inwards extending flange engaging with the first locking sleeve groove to restrict axial movement between the first electrical insulation layer and the connection sleeve, wherein the first radially inwards extending flange has a first radial dimension that decreases gradually in an axial direction towards the connection sleeve, and wherein the first insulation groove has a second radial dimension that decreases gradually in the axial direction towards the connection sleeve; and wherein the first radially inwards extending flange has a maximal radial dimension that is greater than a maximal radial dimension of the second radially inwards extending flange. ### Claim 16 (depends on 15) The power cable accessory assembly as claimed in claim 15, wherein the first radially inwards extending flange has a surface that defines the gradually decreasing first radial dimension, wherein in a longitudinal section of the first locking sleeve the surface defines an axis that intersects a longitudinal axis of the first locking sleeve with an angle in a range of 15-80 degrees. ### Claim 17 (depends on 15) The power cable accessory assembly as claimed in claim 15, wherein the first radial dimension decreases gradually in an axial direction towards the connection sleeve only for an axial length that is between ⅓ and ⅔ of the largest radial thickness of the first electrical insulation layer outside the first insulation groove. ### Claim 18 (depends on 15) The power cable accessory assembly as claimed in claim 15, wherein the first electrical insulation layer has a smallest radial first insulation thickness in the first insulation groove, and a largest radial thickness outside the first insulation groove, wherein the smallest radial first insulation thickness is in a range of ⅓ to ½ of the largest radial thickness of the first electrical insulation layer.