Abstract: Provided is a method of constructing a normal joint structure for connecting superconducting cables having a cable core and an optical fiber arranged along the cable core. With the method, which includes the steps of: pulling out an optical fiber from the end of each of two superconducting cables to be connected together and splicing the optical fibers thus pulled out; returning the excess length of the pulled-out optical fiber to a superconducting cable side upon the completion of splicing; and connecting the cable cores, it is possible to reduce the quantity of optical fiber housed in a joint box, and accordingly to downsize the joint box.

Abstract: The present invention offers a sealing-end structure for a superconducting cable. The structure performs, through a bushing, the outputting and inputting of electric power between a normal-temperature side and a cryogenic-temperature side, where an end portion of a superconducting cable is placed. The sealing-end structure is provided with a coolant vessel at the cryogenic-temperature side for cooling the bushing. The coolant vessel has a liquid-coolant region filled with a liquid coolant and a gaseous-coolant region filled with a gaseous coolant. The coolant vessel is provided with a contraction-absorbing portion for absorbing the contraction of the coolant vessel when it thermally contracts by the effect of the coolant. The sealing-end structure for a superconducting cable suppresses the deterioration of the sealing performance of sealing members placed at the boundary between the normal-temperature side and the cryogenic-temperature side over a long period of use.

Abstract: A cryogenic apparatus of superconducting equipment with excellent assembly workability and a termination structure of a superconducting cable including the cryogenic apparatus are provided. A termination structure of a superconducting cable includes a terminal of the superconducting cable disposed on a low-temperature side, a bushing 10 for communicating power between the low-temperature side and a room-temperature side, a connection part 2 connecting the terminal of the cable and the bushing 10, and a terminal connection box 3 accommodating the connection part 2. The terminal connection box 3 includes a coolant vessel 20 accommodating a terminal of the bushing 10 on the low-temperature side and the connection part 2 and filled with a coolant for cooling the terminal and the connection part 2 and a vacuumed vessel 30 disposed so as to surround the coolant vessel 20.

Abstract: A terminal structure of a superconducting cable is provided that is capable of preventing degradation in airtightness of a seal provided on the boundary between a room-temperature side and a cryogenic side for a long-term use. The terminal structure includes a terminal of a superconducting cable, a bushing providing electrical conduction with a superconducting conductor of the cable, and a refrigerant bath housing the terminal and the bushing. The refrigerant bath includes a liquid nitrogen layer in its cryogenic side and a nitrogen gas layer in its room-temperature side that are adjacent to each other. In the nitrogen gas layer, distance t between an inner surface of the refrigerant bath and an outer periphery of the bushing is dimensioned such that nitrogen gas is kept in a gaseous state without being pressurized by a pressurizer and respective pressures of nitrogen gas and liquid nitrogen counterbalance each other.

Abstract: Provided is a method of constructing a normal joint structure for connecting superconducting cables having a cable core and an optical fiber arranged along the cable core. With the method, which includes the steps of: pulling out an optical fiber from the end of each of two superconducting cables to be connected together and splicing the optical fibers thus pulled out; returning the excess length of the pulled-out optical fiber to a superconducting cable side upon the completion of splicing; and connecting the cable cores, it is possible to reduce the quantity of optical fiber housed in a joint box, and accordingly to downsize the joint box.

Abstract: A joint for a superconducting cable joints superconducting cables with one another. The superconducting cable comprises a former, superconducting conductor, and insulating layer. The construction of the joint comprises the following steps: preparing a jointing ferrule for jointing the formers, sliding the ferrule over the end portions of the formers to be jointed, butting the end faces of the formers against each other in the jointing ferrule, compressing the jointing ferrule to joint the formers such that the compressed ferrule has a diameter equal to that of the former of the superconducting cable, butting the end faces of the superconducting conductors against each other at the outside of the compressed ferrule, and jointing the superconducting conductors with each other such that the jointed superconducting conductors have a diameter equal to that of the superconducting conductor of the superconducting cable. The foregoing steps can decrease the size of the joint.

Abstract: A coupling structure of a superconducting cable is formed at an end portion of the superconducting cable having a superconducting layer and an outer peripheral layer formed thereon. The superconducting layer is coupled to a coupling member. A holding member 220 covers the superconducting layer between an end portion of the coupling member and an end portion of the outer peripheral layer. The holding member holds the superconducting layer so that the superconducting layer is prevented from being pushed in a longitudinal direction in a state in which the superconducting layer is in a direct contact with the outer peripheral layer, even when a relative movement occurs between the superconducting layer and the outer peripheral layer. Therefore, a buckling of the superconducting layer can be prevented.

Abstract: A cryogenic apparatus of superconducting equipment with excellent assembly workability and a termination structure of a superconducting cable including the cryogenic apparatus are provided. A termination structure of a superconducting cable includes a terminal of the superconducting cable disposed on a low-temperature side, a bushing 10 for communicating power between the low-temperature side and a room-temperature side, a connection part 2 connecting the terminal of the cable and the bushing 10, and a terminal connection box 3 accommodating the connection part 2. The terminal connection box 3 includes a coolant vessel 20 accommodating a terminal of the bushing 10 on the low-temperature side and the connection part 2 and filled with a coolant for cooling the terminal and the connection part 2 and a vacuumed vessel 30 disposed so as to surround the coolant vessel 20.

Abstract: A branch-type intermediate joint structure for connecting a first superconducting cable having at least one cable core including superconducting conductors and a second superconducting cable having a plurality of cable cores including superconducting conductors. The intermediate joint structure comprises a conductor joint part, a joint box, and a coolant. The conductor joint part can integrally connect the superconducting conductors of the at least one cable core exposed from the first superconducting cable and the superconducting conductors of the plurality of cable cores exposed from the second superconducting cable. The joint box houses the conductor joint part and the cable core ends connected with the conductor joint part. The coolant is filled in the joint box and cools the superconducting conductors.

Abstract: The present invention provides a method for forming a connecting part of superconducting cables by which the outside diameter of the connecting part can be reduced. A method for assembling a connecting part of superconducting cables, to form a connecting part at an end of a superconducting cable including a thermal insulating tube 100 and a cable core 200 accommodated therein, the method including the following steps: the step of holding the thermal insulating tube with an end of the cable core 200 exposed from the thermal insulating tube 100, at the end of the superconducting cable; the step of forming a connecting structure 710 at the end of the cable core 200; and the step of pushing back the cable core 200 into the thermal insulating tube 100 by a predetermined length.

Abstract: The present invention offers a sealing-end structure for a superconducting cable. The structure performs, through a bushing, the outputting and inputting of electric power between a normal-temperature side and a cryogenic-temperature side, where an end portion of a superconducting cable is placed. The sealing-end structure is provided with a coolant vessel at the cryogenic-temperature side for cooling the bushing. The coolant vessel has a liquid-coolant region filled with a liquid coolant and a gaseous-coolant region filled with a gaseous coolant. The coolant vessel is provided with a contraction-absorbing portion for absorbing the contraction of the coolant vessel when it thermally contracts by the effect of the coolant. The sealing-end structure for a superconducting cable suppresses the deterioration of the sealing performance of sealing members placed at the boundary between the normal-temperature side and the cryogenic-temperature side over a long period of use.

Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.

Abstract: A multiphase superconducting cable connection structure includes a connection box accommodating three conductor connects connecting a superconductor of a cable core of each phase extracted from a pair of 3-phase superconducting cables, a solid insulation member fixed to an outer circumference of each conductor connect, and a metal flange fixing the solid insulation member to the connection box. By fixing the metal flange to the connection box (a refrigerant vessel), the conductor connect can be positioned and the conductor connector's movement caused as the cable core thermally contracts can be reduced. The structure can help to position the conductor connect in the connection box and reliably hold it at a prescribed position.

Abstract: A terminal structure of a superconducting cable is provided that is capable of preventing degradation in airtightness of a seal provided on the boundary between a room-temperature side and a cryogenic side for a long-term use. The terminal structure includes a terminal of a superconducting cable, a bushing providing electrical conduction with a superconducting conductor of the cable, and a refrigerant bath housing the terminal and the bushing. The refrigerant bath includes a liquid nitrogen layer in its cryogenic side and a nitrogen gas layer in its room-temperature side that are adjacent to each other. In the nitrogen gas layer, distance t between an inner surface of the refrigerant bath and an outer periphery of the bushing is dimensioned such that nitrogen gas is kept in a gaseous state without being pressurized by a pressurizer and respective pressures of nitrogen gas and liquid nitrogen counterbalance each other.

Abstract: Provided is a splice structure of a superconducting cable comprising: a joint box housing an end of a superconducting cable having a superconducting conductor; a coolant filled in the joint box so as to cool the end; and a pressure-adjusting part provided in the joint box and capable of adjusting the pressure by changing its shape according to a change of pressure in the joint box.

Abstract: A terminal structure is provided between an end of a multiphase superconducting cable and a room temperature side, the multiphase superconducting cable having a plurality of superconducting layers for flowing currents of different phases, the superconducting layers being concentrically disposed and separated by conductor-insulation layers. The terminal structure includes a refrigerant tank filled with a refrigerant for cooling the ends of the superconducting layers; leads electrically connected to the ends of the individual superconducting layers; and an insulating member disposed around the peripheries of the leads, the insulating member sealing the refrigerant in the refrigerant tank.

Abstract: A first flange and a second flange are superposed and fastened with a bolt and a nut in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange has a thickness L1 and a coefficient of linear expansion ?1, the second flange has a thickness L2 and a coefficient of linear expansion ?2, superposed first flange and second flange have a thickness L, and the bolt has a coefficient of linear expansion ?, a relation of L·??L1·?1+L2·?2 is satisfied, i.e. heat shrinkage of the bolt is not smaller than the total heat shrinkage of the first and second flanges. Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.

Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.

Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.

Abstract: A joint for a superconducting cable joints superconducting cables with one another. The superconducting cable comprises a former, superconducting conductor, and insulating layer. The construction of the joint comprises the following steps: preparing a jointing ferrule for jointing the formers, sliding the ferrule over the end portions of the formers to be jointed, butting the end faces of the formers against each other in the jointing ferrule, compressing the jointing ferrule to joint the formers such that the compressed ferrule has a diameter equal to that of the former, butting the end faces of the superconducting conductors against each other at the outside of the compressed ferrule, and jointing the superconducting conductors with each other such that the jointed superconducting conductors have a diameter equal to that of the superconducting conductor of the superconducting cable. The foregoing steps can decrease the size of the joint.