# US 11,309,102 B2 · Power cable > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,102 B2 - Document ID: US11309102B2 - Status: Granted - Kind: B2 - Application number: 16/326,013 - Filed: 2017-03-30 - Published: 2021-10-28 - Granted: 2022-04-19 - Earliest claimed: 2016-08-18 - Assignees: Ls Cable & System Ltd. - Applicants: Ls Cable & System Ltd. - Inventors: Sung Woo Jang; Jae Cheol Gwag - Web page: https://patentgrep.com/patent/US11309102B2 ## CPC - H01B 3/48: fibrous materials (fibre-reinforced plastics H01B3/47) - H01B 9/027: {composed of semi-conducting layers} - H01B 1/04: mainly consisting of carbon-silicon compounds, carbon or silicon - H01B 3/20: liquids, e.g. oils (silicone oils H01B3/46) - H01B 7/0225: {Three or more layers} - H01B 7/1875: {Multi-layer sheaths} - H01B 7/2813: {Protection against damage caused by electrical, chemical or water tree deterioration} - H01B 7/14: Submarine cables - 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 Provided is a power cable, and more particularly, to an ultra-high-voltage underground or submarine cable. In detail, the present invention relates to a power cable which is capable of effectively preventing a decrease in dielectric strength due to penetration of copper powder from a copper conductor into an insulating layer, thereby increasing the lifespan thereof, is capable of preventing damage to insulating paper, semiconductor paper, etc. even when repeatedly bent and unfolded, thereby maintaining an interlayer structure formed by winding the insulating paper, the semiconductor paper, etc., and is capable of improving bendability, flexibility, installability, workability, etc. ## Claims ### Claim 1 A power cable comprising: a conductor; an inner semi-conductive layer covering the conductor; an insulating layer covering the inner semi-conductive layer; an outer semi-conductive layer covering the insulating layer; a metal sheath layer covering the outer semi-conductive layer; and a cable protection layer covering the metal sheath layer, wherein the inner semi-conductive layer comprises a plurality of layers formed by horizontally winding semi-conductive paper, wherein the plurality of layers comprise at least one layer formed by overlap-winding the semi-conductive paper such that portions of a width of the semi-conductive paper overlap each other, when the semi-conductive paper is horizontally wound, wherein a total width of the inner semi-conductive layer is in a range of 0.2 to 1.5 mm. ### Claim 2 (depends on 1) The power cable of claim 1, wherein remaining layers of the plurality of layers of the inner semi-conductive layer, other than the at least one layer formed by overlap-winding the semi-conductive paper, comprise layers formed by gap-winding semi-conductive paper such that regular gaps are formed between portions of the horizontally wound semi-conductive paper and the gaps in a certain layer are covered with sheets of semi-conductive paper forming layers above and below the certain layer. ### Claim 3 (depends on 1) The power cable of claim 1, wherein the at least one layer formed by overlap-winding the semi-conductive paper comprises a layer directly above the conductor. ### Claim 4 (depends on 1) The power cable of claim 1, wherein an overlap ratio of the at least one layer formed by overlap-winding the semi-conductive paper is in a range of 20 to 80%, the overlap ratio being a ratio between overlapping portions of the semi-conductive paper and a width of the semi-conductive paper. ### Claim 5 (depends on 1) The power cable of claim 1, wherein a number of the plurality of layers of the semi-conductive paper is in a range of 4 to 10, and the semi-conductive paper has a width of 15 to 30 mm. ### Claim 6 (depends on 1) The power cable of claim 1, wherein the semi-conductive paper comprises carbon paper obtained by processing insulating paper with carbon black. ### Claim 7 (depends on 1) The power cable of claim 1, wherein the insulating layer comprises a plurality of layers formed by horizontally winding insulating paper, wherein the plurality of layers comprise layers formed by gap-winding the insulating paper such that regular gaps are formed between portions of the horizontally wound insulating paper and the gaps in a certain layer are covered with sheets of insulating paper forming layers above and below the certain layer. ### Claim 8 (depends on 7) The power cable of claim 7, wherein the insulating layer comprises an inner insulating layer, an intermediate insulating layer, and an outer insulating layer which are sequentially stacked, wherein each of the inner insulating layer and the outer insulating layer is formed of kraft paper impregnated with insulating oil, the intermediate insulating layer is formed by semi-synthetic paper impregnated with the insulating oil, wherein the semi-synthetic paper comprises: a plastic film; and kraft paper stacked on at least one surface of the plastic film, and the inner insulating layer and the outer insulating layer have resistivity lower than that of the intermediate insulating layer. ### Claim 9 (depends on 8) The power cable of claim 8, wherein a thickness of the inner insulating layer is 1 to 10% of a total thickness of the insulating layer, a thickness of the intermediate insulating layer is 75% or more of the total thickness of the insulating layer, and a thickness of the outer insulating layer is 5 to 15% of the total thickness of the insulating layer. ### Claim 10 (depends on 9) The power cable of claim 9, wherein the thickness of the outer insulating layer is greater than that of the inner insulating layer. ### Claim 11 (depends on 1) The power cable of claim 1, wherein the cable protection layer comprises an inner sheath, bedding layers, a metal reinforcement layer, and an outer sheath. ### Claim 12 (depends on 11) The power cable of claim 11, wherein the cable protection layer further comprises a wire sheath and an outer serving layer.