Abstract: A termination structure for a superconducting cable is described. The termination structure for a superconducting cable includes a first tube including a conductive rod therein to form a room temperature section, a second tube including a conductive rod therein to form a temperature gradient section, and a spacer provided between the first and second tubes, the spacer including a conductive connector configured to connect the conductive rods inside the first and second tubes to each other. The first and second tubes are joined to be separable from each other.

Abstract: The arrangement method of superconducting wires of a superconducting cable, includes: in a case where a refrigerator is installed at one of terminal structures provided on both sides of a superconducting cable, and a cooling fluid is passed through the superconducting cable by a pump for cooling, setting the numbers of superconducting wires of sections of the superconducting cable installed between the terminal structures on both the sides to be different depending to temperatures of the sections, wherein the numbers of superconducting wires are increased from the section of the superconducting cable having the lowest temperature to the section thereof having the highest temperature while maintaining a current-carrying capability.

Abstract: A terminal apparatus for a superconducting cable system connects an overhead transmission cable or power appliance such as a breaker in an ambient temperature state to a superconducting cable through which power is transmitted at a cryogenic temperature. The terminal apparatus has: a refrigerant tub which is connected to the end of a superconducting cable and is filled with a refrigerant; a vacuum heat insulating container that surrounds the exterior of the refrigerant tub; a current lead having one end connected to the end portion of the superconducting cable and the other end connected to the overhead transmission cable or power appliance through the refrigerant tub and the vacuum heat insulating container; and a superconducting fault current limiter installed at a center portion of the current lead in the interior of the refrigerant tub to limit fault current.

Abstract: The arrangement method of superconducting wires of a superconducting cable, includes: in a case where a refrigerator is installed at one of terminal structures provided on both sides of a superconducting cable, and a cooling fluid is passed through the superconducting cable by a pump for cooling, setting the numbers of superconducting wires of sections of the superconducting cable installed between the terminal structures on both the sides to be different depending to temperatures of the sections, wherein the numbers of superconducting wires are increased from the section of the superconducting cable having the lowest temperature to the section thereof having the highest temperature while maintaining a current-carrying capability.

Abstract: A termination structure for a superconducting cable is provided. The termination structure for a superconducting cable includes a first tube including a conductive rod therein to form a room temperature section, a second tube including a conductive rod therein to form a temperature gradient section, and a spacer provided between the first and second tubes, the spacer comprising a conductive connector configured to connect the conductive rods inside the first and second tubes to each other. The first and second tubes are joined to be separable from each other.

Abstract: A superconducting cable having wide-width superconducting strip lines. The superconducting cable having wide-width superconducting strip lines includes, from the center of the cable, a former, a superconducting layer, an electronic insulation layer, and a superconducting shield layer. The superconducting layer is formed as a plurality of superconducting strip lines spirally wound around the circumference of the former, and each of the strip lines has a rectangular cross section. The strip lines are, respectively, made up of a wide-width strip line of which the ratio of the width to the thickness is within the range of 20 to 30. The cable may prevent to deteriorate the efficiency of the cable, by reducing the vertical element of the magnetic field occurred around the strip lines. The structure disclosed herein may reduce the whole intensity of the magnetic field, and reduce the whole outer diameter of the cable.

Abstract: Disclosed herein is a shielding conductor connecting structure of a terminal for super-conductor cable. The shielding conductor connecting structure includes an inner cryostat for forming an extremely low temperature portion while having a super-conductor cable formed therein, an outer cryostat formed with an interval so that a shielding conductor is extracted from the super-conductor cable, a plurality of vacuum tubes formed at an interval to protrude along an outer circumferential surface of the outer cryostat, a short-circuit conductor formed in each of the vacuum tubes to be connected to another phase connection portion and a short-circuit conductor connection portion formed in the interior of the outer cryostat and connected to the short-circuit conductor in the vacuum tube while being connected to the shielding conductor connected to the super-conductor cable.

Abstract: A superconductive cable is provided which upon normal state, restricts flowing of electric current to a former to the maximum extent to thereby keep a cryogenic state in the superconductive cable stable. The superconductive cable includes a former surrounded by a superconductive layer and a cryostat provided at the outside of the superconductive layer, wherein the former includes a metal wire-wound part around which a plurality of wires is wound and an eddy-current prevention layer provided on the outer face of the wire-wound part, and the metal wires and the eddy-current prevention layer are made of a copper alloy.

Abstract: A terminal apparatus for a superconducting cable system connects an overhead transmission cable or power appliance such as a breaker in an ambient temperature state to a superconducting cable through which power is transmitted at a cryogenic temperature. The terminal apparatus has: a refrigerant tub which is connected to the end of a superconducting cable and is filled with a refrigerant; a vacuum heat insulating container that surrounds the exterior of the refrigerant tub; a current lead having one end connected to the end portion of the superconducting cable and the other end connected to the overhead transmission cable or power appliance through the refrigerant tub and the vacuum heat insulating container; and a superconducting fault current limiter installed at a center portion of the current lead in the interior of the refrigerant tub to limit fault current.

Abstract: The present invention relates to a combination twist structure of a superconducting cable core. The present invention relates to a new type of a combination twist structure of a superconducting cable core capable of accommodating the thermal contraction of the cable core in the longitudinal direction without having a space for accommodation, thereby capable of reducing an outer diameter of the superconducting cable, and eliminating the use of an additional equipment for forming the space for accommodation. The present invention provides a combination twist structure of a superconducting cable core formed by twisting a plurality of cable cores. The cable cores are combined by repeatedly changing a twist direction of the cable cores, and the contraction of the cable cores in the longitudinal direction is accommodated by untwisting the cable cores.

Abstract: A cryostat of a superconducting cable disclosed herein includes an inner metallic tube filled with liquid nitrogen and extended along the circumference of a core, an outer metallic tube surrounding the circumference of the inner metallic tube at a distance, a cooling vessel of a terminal connecting box connected to the inner metallic tube and filled with liquid nitrogen, an insulation tube surrounding the circumference of the cooling vessel at a distance, an inner bellows tube connecting an end of the outer metallic tube to the cooling vessel, and an outer bellows tube spaced apart from the inner bellows tube and connecting the end of the outer metallic tube to the insulation tube.

Abstract: An apparatus for supplying liquid nitrogen for a decompression device: includes a liquid nitrogen supply line extending such that high-temperature, high-pressure liquid nitrogen is introduced to a decompression device; a bypass pipe diverging from the liquid nitrogen supply line; and an expansion unit installed at the bypass pipe to evaporate the liquid nitrogen into nitrogen gas. The expansion unit is disposed to absorb heat from the liquid nitrogen in the liquid nitrogen supply line before being introduced to the decompression device.

Abstract: Provided is a superconducting cable provided with an enhanced cooling ability, the superconducting cable including a core including a superconducting wire rod; an inner sheath surrounding the core; an outer sheath surrounding the inner sheath; a plurality of communication pipes that have both ends communicating with the inner and outer sheaths, and are mounted in the longitudinal direction of the inner and outer sheaths; a plurality of valves that are mounted in the communication pipes; and a plurality of auxiliary cooling systems that are mounted on some of the communication pipes. Cooling fluid supplied from the cooling systems is supplied into the inner sheath through the communication pipes, and is then discharged to the outside through the valves.

Abstract: A superconductive cable is provided which upon normal state, restricts flowing of electric current to a former to the maximum extent to thereby keep a cryogenic state in the superconductive cable stable. The superconductive cable includes a former surrounded by a superconductive layer and a cryostat provided at the outside of the superconductive layer, wherein the former includes a metal wire-wound part around which a plurality of wires is wound and an eddy-current prevention layer provided on the outer face of the wire-wound part, and the metal wires and the eddy-current prevention layer are made of a copper alloy.

Abstract: A cryogenic refrigerator has a separating device provided between a lower temperature portion and a heat exchanger to selectively separate the lower temperature portion and the heat exchanger, and thus to selectively block heat transfer between the lower temperature portion and the heat exchanger. According to the cryogenic refrigerator, it can have an ability to perform a maintenance operation of the cryogenic refrigerator at normal temperature by blocking heat transfer from the lower temperature portion to the heat exchanger during maintenance after disassembly.