Abstract: A fixation structure for fixing a superconducting cable including a cable core and a thermal insulation tube. The fixation structure includes a fixation box connected to the thermal insulation tube, including a hollow thermal insulation structure, and through which the cable core is passed, a fixation body for fixing the cable core on the inner wall of the fixation box, and a diameter-expanded reinforcement layer that is an electrical insulation layer that has a diameter decreasing toward both ends and is formed on the cable core. A refrigerant flows through the inside of the inner wall of the fixation box. The cable core is fixed on the inner wall with the fixation body through the diameter-expanded reinforcement layer. The structure implements a simple and low-cost fixation structure appropriate for an electric field design.

Abstract: In an intermediate connecting unit 50 of superconducting cables, by forming the connecting superconducting wires 101 in a trapezoid shape tapered in the direction of the electric insulating layer 113 (the superconducting shield layers 114) sides from the large radius section 213a side of the reinforcement insulating layer 213, the inclined surface sections 213b can be covered without spaces and without the plurality of connecting superconducting wires overlapping. The plurality of connecting superconducting wires 101 cover the inclined surface sections 213b of the reinforcement insulating layer 213 formed thicker than the radius of the cable cores 11 of the superconducting cables 10. The connecting superconducting wires 101 further connects the superconducting wires 10 arranged on the outer periphery of the large radius section 213a of the reinforcement insulating layer 213 and the superconducting wires 100 constituting the superconducting shield layers 114.

Abstract: A connection structure of formers for connecting hollow formers provided inside superconducting cables, comprising: a connection conduit which is hollow, wherein one end section and the other end section of the connection conduit are inserted into open sections leading to hollow internal sections formed at connection end sections of the respective formers, and the opposed connection end sections of the respective formers are connected to each other by welding. The connection conduit thereby ensures circulation of a refrigerant. Also, there is no incidence of the cooling medium circulation path being blocked when welding is performed in the connection conduit, allowing formers to be more easily connected.

Abstract: An AC superconducting cable with an insulating layer on the external circumference of a conductor, and wherein: the insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer, from the inside layer to the outside layer; the insulating layer is impregnated with liquid nitrogen; the product of the dielectric constant ?1 of the first insulating layer and the dielectric loss tangent tan ?1 and the product of the dielectric constant ?2 of the second insulating layer and the dielectric loss tangent tan ?2 fulfilling the relationship ?1×tan ?1>?2×tan ?2; and the product of the dielectric constant ?2 of the second insulating layer and the dielectric loss tangent tan ?2 and the product of the dielectric constant ?3 of the third insulating layer and the dielectric loss tangent tan ?3 fulfilling the relationship ?2×tan ?2<?3×tan ?3.

Abstract: In a terminal structure of a superconducting cable conductor, a terminal portion of the superconducting cable conductor is connected with a terminal member of a good conductor. The terminal portion includes a superconducting layer disposed on an outer periphery of a central support; and an insulating layer surrounding the superconducting layer. The insulating layer and the superconducting layer are partially removed to expose the central support and the superconducting layer in this order from an end of the superconducting cable conductor. The terminal member includes a metal sleeve which includes a first cylindrical portion whose inner surface is in close contact with an exposed portion of the central support; a second cylindrical portion which is soldered around an exposed portion of the superconducting layer; and a third cylindrical portion into which the insulating layer is inserted.

Abstract: In an intermediate connecting unit 50 of superconducting cables, by forming the connecting superconducting wires 101 in a trapezoid shape tapered in the direction of the electric insulating layer 113 (the superconducting shield layers 114) sides from the large radius section 213a side of the reinforcement insulating layer 213, the inclined surface sections 213b can be covered without spaces and without the plurality of connecting superconducting wires overlapping. The plurality of connecting superconducting wires 101 cover the inclined surface sections 213b of the reinforcement insulating layer 213 formed thicker than the radius of the cable cores 11 of the superconducting cables 10. The connecting superconducting wires 101 further connects the superconducting wires 10 arranged on the outer periphery of the large radius section 213a of the reinforcement insulating layer 213 and the superconducting wires 100 constituting the superconducting shield layers 114.

Abstract: A superconducting wire connection structure comprises a first superconducting wire and a second superconducting wire, ends of which are arranged across from each other, and a third superconducting wire which spans and connects the first superconducting wire and the second superconducting wire along a longitudinal direction of the first superconducting wire and the second superconducting wire. Each of the first superconducting wire, the second superconducting wire and the third superconducting wire is a tape-shaped superconducting wire which includes a substrate laminated with at least a superconductive layer. The third wire is narrower in at least one portion than the first superconducting wire and the second superconducting wire.

Abstract: A thermal insulation tube has a double-structure including a thermal insulation internal tube and a thermal insulation external tube, an intermediate connecting part has a double-structure including an outer container and an inner container, the internal tube and the external tube penetrate through a wall surface of the outer container and are introduced at least up to a wall surface of the inner container, a region between the internal tube and the external tube is sealed by joining an end to be introduced of the internal tube and an end to be introduced of the external tube, at an introduction portion of the external tube to be positioned on an inner side of a wall surface of the outer container, and a corrugated tubular part has a tube wall thinner than the external tube outside of the wall surface.

Abstract: A connection structure for superconducting cables includes: superconducting cables that are connected to each other and include cable cores containing formers and superconducting conductor layers, and each cable core is housed in a thermal insulation tube with a cooling medium, wherein the cable cores include electric insulating layers obtained by winding insulating sheets around the superconducting conductor layers, the electric insulating layers on both sides of a conductor connecting part, in which the formers and the superconducting conductor layers are connected to each other, include taper shape portions each having a diameter reducing towards the conductor connecting part, each taper shape portion is formed so as to have an inclination angle changing in a stepwise fashion by a plurality of tapered portions among which a tapered portion nearer the conductor connecting part has smaller inclination angle, and a reinforcing insulating layer is provided between the taper shape portions.

Abstract: A fixation structure for fixing a superconducting cable including a cable core and a thermal insulation tube. The fixation structure includes a fixation box connected to the thermal insulation tube, including a hollow thermal insulation structure, and through which the cable core is passed, a fixation body for fixing the cable core on the inner wall of the fixation box, and a diameter-expanded reinforcement layer that is an electrical insulation layer that has a diameter decreasing toward both ends and is formed on the cable core. A refrigerant flows through the inside of the inner wall of the fixation box. The cable core is fixed on the inner wall with the fixation body through the diameter-expanded reinforcement layer. The structure implements a simple and low-cost fixation structure appropriate for an electric field design.

Abstract: An AC superconducting cable with an insulating layer on the external circumference of a conductor, and wherein: the insulating layer includes a first insulating layer, a second insulating layer and a third insulating layer, from the inside layer to the outside layer; the insulating layer is impregnated with liquid nitrogen; the product of the dielectric constant ?1 of the first insulating layer and the dielectric loss tangent tan ?1 and the product of the dielectric constant ?2 of the second insulating layer and the dielectric loss tangent tan ?2 fulfilling the relationship ?1×tan ?1>?2×tan ?2; and the product of the dielectric constant ?2 of the second insulating layer and the dielectric loss tangent tan ?2 and the product of the dielectric constant ?3 of the third insulating layer and the dielectric loss tangent tan ?3 fulfilling the relationship ?2×tan ?2<?3×tan ?3.

Abstract: In a superconducting cable line in which a superconducting cable is connected to a terminal connecting part or an intermediate connecting part, an offset part in which a superconducting cable is laid in a curved-shape is provided near the terminal connecting part or the intermediate connecting part. Further, when it is assumed that the superconducting cable is movable in the offset part, an external tube of the superconducting cable is fixed such that a maximum amplitude part which maximizes the amount of movement of the superconducting cable following thermal expansion and contraction of a cable core becomes immovable.

Abstract: A thermal insulation tube has a double-structure including a thermal insulation internal tube and a thermal insulation external tube, an intermediate connecting part has a double-structure including an outer container and an inner container, the internal tube and the external tube penetrate through a wall surface of the outer container and are introduced at least up to a wall surface of the inner container, a region between the internal tube and the external tube is sealed by joining an end to be introduced of the internal tube and an end to be introduced of the external tube, at an introduction portion of the external tube to be positioned on an inner side of a wall surface of the outer container, and a corrugated tubular part has a tube wall thinner than the external tube outside of the wall surface.

Abstract: In a terminal structure of a superconducting cable conductor, a terminal portion of the superconducting cable conductor is connected with a terminal member of a good conductor. The terminal portion includes a superconducting layer disposed on an outer periphery of a central support; and an insulating layer surrounding the superconducting layer. The insulating layer and the superconducting layer are partially removed to expose the central support and the superconducting layer in this order from an end of the superconducting cable conductor. The terminal member includes a metal sleeve which includes a first cylindrical portion whose inner surface is in close contact with an exposed portion of the central support; a second cylindrical portion which is soldered around an exposed portion of the superconducting layer; and a third cylindrical portion into which the insulating layer is inserted.

Abstract: A cryogenic cable termination connector having a small heat inflow from the outside and stable electrical insulation properties. The cryogenic cable termination connector includes a lead-out conductor led out from a site at a very low temperature to a site at room temperature via a liquid refrigerant layer, a refrigerant gas layer, and an oil layer. The lead-out conductor includes a capacitor-cone insulator in which plural metal foils for dividing an electric field from a high voltage level down to the ground voltage level are stacked through an insulator. Among electric field tilting portions in which voltage changes gradually from the high voltage level to the ground voltage level, an electric field tilting portion positioned at a lower part is located in the liquid refrigerant layer and an electric field tilting portion positioned at an upper part is located in the oil layer.

Abstract: A superconducting wire having at least a superconducting thin film and a stabilizing film formed one on top of another in order on a substrate having a predetermined width and a predetermined length, the superconducting wire having at least one cut made along a direction of the length of the superconducting wire, the superconducting wire being bendable at the cut in a width direction.

Abstract: A current terminal structure of a superconductor has a former, and a superconducting wire wound around the former in one or more layers and including a substrate and a superconducting layer formed on the substrate. A first layer superconducting wire wound around immediately above the former is arranged so that a substrate side thereof becomes outside and a superconducting layer side thereof becomes inside. A surface of the superconducting layer at an end of the first layer superconducting wire, which is directed toward the inside, and part of a surface of the superconducting layer of a connection superconducting wire, which is directed toward the outside, are faced and connected to each other.

Abstract: A thin film superconductive wire material (16) and an electro conductive tape (15) are immersed in a solder bath (35) containing a solder, which includes Sn(tin) and Bi (bismuth), to bond the thin film superconductive wire material (16) and the electro conductive tape (15) and a composite superconductive wire material (10) is formed.

Abstract: A current terminal structure of a superconductor has a former, and a superconducting wire wound around the former in one or more layers and including a substrate and a superconducting layer formed on the substrate. A first layer superconducting wire wound around immediately above the former is arranged so that a substrate side thereof becomes outside and a superconducting layer side thereof becomes inside. A surface of the superconducting layer at an end of the first layer superconducting wire, which is directed toward the inside, and part of a surface of the superconducting layer of a connection superconducting wire, which is directed toward the outside, are faced and connected to each other.

Abstract: A thin film superconductive wire material (16) and an electro conductive tape (15) are immersed in a solder bath (35) containing a solder, which includes Sn(tin) and Bi(bismuth), to bond the thin film superconductive wire material (16) and the electro conductive tape (15) and a composite superconductive wire material (10) is formed.