# US 10,872,713 B1 · Power cable system with cooling capability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,713 B1 - Document ID: US10872713B1 - Status: Granted - Kind: B1 - Application number: 16/506,643 - Filed: 2019-07-09 - Published: 2021-01-14 - Granted: 2020-12-22 - Earliest claimed: 2019-07-09 - Assignees: NKT HV Cables AB - Applicants: NKT HV Cables AB - Inventors: Robert Wayne Hobson - Web page: https://patentgrep.com/patent/US10872713B1 ## CPC - H01B 7/423: {using a cooling fluid} - F28D 7/00: Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall - H02G 3/03: Cooling - H02G 9/06: in underground tubes or conduits; Tubes or conduits therefor - H01B 12/16: characterised by cooling - H02G 15/34: Cable fittings for cryogenic cables {(superconductive cables per se H01B12/00)} - 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}) - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES ## Abstract 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. ## Claims ### Claim 1 A power cable system comprising: a power cable, and an evaporator pipe assembly arranged external to the power cable and extending along the power cable, wherein the evaporator pipe assembly comprises 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. ### Claim 2 (depends on 1) The power cable system as claimed in claim 1, wherein the liquid refrigerant is arranged to flow along the length of the evaporator pipe assembly. ### Claim 3 (depends on 2) The power cable system as claimed in claim 2, wherein the evaporator pipe assembly extends along the entire or essentially the entire length of the power cable. ### Claim 4 (depends on 2) The power cable system as claimed in claim 2, further comprising: a compressor unit having a suction side and a discharge side, wherein the outer gas pipe is connected to the suction side and the inner liquid pipe is connected to the discharge side. ### Claim 5 (depends on 2) The power cable system as claimed in claim 2, wherein the inner liquid pipe and the outer gas pipe are made of metal. ### Claim 6 (depends on 1) The power cable system as claimed in claim 1, wherein the evaporator pipe assembly extends along the entire or essentially the entire length of the power cable. ### Claim 7 (depends on 1) The power cable system as claimed in claim 1, further comprising: a compressor unit having a suction side and a discharge side, wherein the outer gas pipe is connected to the suction side and the inner liquid pipe is connected to the discharge side. ### Claim 8 (depends on 7) The power cable system as claimed in claim 7, wherein the compressor unit is configured to compress the evaporated refrigerant to liquid state as the evaporated refrigerant passes through the compressor unit and discharge it on the discharge side to the inner liquid pipe. ### Claim 9 (depends on 8) The power cable system as claimed in claim 8, wherein the compressor unit is configured to be controlled to change the suction in the outer gas pipe to provide the evaporator pipe assembly with a controllable cooling functionality. ### Claim 10 (depends on 7) The power cable system as claimed in claim 7, wherein the compressor unit is configured to be controlled to change the suction in the outer gas pipe to provide the evaporator pipe assembly with a controllable cooling functionality. ### Claim 11 (depends on 1) The power cable system as claimed in claim 1, wherein the inner liquid pipe and the outer gas pipe are made of metal. ### Claim 12 (depends on 1) The power cable system as claimed in claim 1, comprising an outer pipe, wherein the power cable and the evaporator pipe assembly are arranged in the outer pipe. ### Claim 13 (depends on 1) The power cable system as claimed in claim 1, wherein the liquid refrigerant is carbon dioxide. ### Claim 14 (depends on 1) The power cable system as claimed in claim 1, wherein the outer pipe is filled with a fluid. ### Claim 15 (depends on 14) The power cable system as claimed in claim 14, wherein the fluid is a liquid. ### Claim 16 (depends on 15) The power cable system as claimed in claim 15, wherein the liquid is water. ### Claim 17 (depends on 16) The power cable system as claimed in claim 16, comprising a first liquid tank, and a liquid movement system configured to move the liquid from the first liquid tank and back to the first liquid tank through the outer pipe. ### Claim 18 (depends on 15) The power cable system as claimed in claim 15, comprising a first liquid tank, and a liquid movement system configured to move the liquid from the first liquid tank and back to the first liquid tank through the outer pipe. ### Claim 19 (depends on 18) The power cable system as claimed in claim 18, wherein the liquid movement system is configured to move the liquid with turbulent flow through the outer pipe. ### Claim 20 (depends on 18) The power cable system as claimed in claim 18, wherein the liquid movement system comprises at least one pump. ### Claim 21 (depends on 1) The power cable system as claimed in claim 1, wherein the power cable is spaced apart from the evaporator pipe assembly.