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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 eac

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.

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What is claimed is: 1. A multiphase superconducting cable connection structure comprising: a pair of multiphase superconducting cables each including a plurality of cable cores that each have a superconductor; a connection box accommodating a plurality of conductor connects, each of the plurality o

What is claimed is: 1. A multiphase superconducting cable connection structure comprising: a pair of multiphase superconducting cables each including a plurality of cable cores that each have a superconductor; a connection box accommodating a plurality of conductor connects, each of the plurality of conductor connects connecting a superconductor of a corresponding cable core of the plurality of cable cores of one of the pair of multiphase superconducting cables to a superconductor of a corresponding cable core of the plurality of cable cores of another one of the pair of multiphase superconducting cables; a plurality of solid insulation members, each solid insulation member of the plurality of solid insulation members fixed to an outer circumference of a corresponding conductor connect of said plurality of conductor connects; and a metal flange fixing the plurality of solid insulation members to said connection box; wherein each cable core of the plurality of cable cores of the one of the pair of multiphase superconducting cables includes a shield layer surrounding said superconductor of the cable core; wherein the multiphase superconducting cable connection structure further includes a shield connect provided to short circuit shield layers of at least two cable cores of the plurality of cable cores of the one of the pair of multiphase superconducting cables; and wherein the shield connect is formed of an element different from said shield layers of said at least two cable cores. 2. The multiphase superconducting cable connection structure according to claim 1, wherein said connection box has a refrigerant introduced therein; and wherein said metal flange has a flow hole allowing refrigerant to be communicated therethrough. 3. The multiphase superconducting cable connection structure according to claim 1, wherein said connection box is formed of pieces and thus dividable in a longitudinal direction of a cable core of the plurality of cable cores of the one of the pair of multiphase superconducting cables. 4. The multiphase superconducting cable connection structure according to claim 1, wherein said connection box is a cylinder. 5. The multiphase superconducting cable connection structure according to claim 1, wherein said shield connect is formed of at least one of normal-conducting material and superconducting material. 6. The multiphase superconducting cable connection structure according to claim 1, further comprising a shield link connecting together a shield layer of a cable core of the plurality of cable cores of the one of the pair of multiphase superconducting cables and a shield layer of a cable core of the plurality of cable cores of the another one of the pair of multiphase superconducting cables. 7. The multiphase superconducting cable connection structure according to claim 6, wherein said shield link is formed of at least one of normal-conducting material and superconducting material. 8. The multiphase superconducting cable connection structure according to claim 1, wherein the metal flange has a first surface and a second surface opposite the first surface; and wherein, when a refrigerant is filled into the connection box, the first surface and the second surface of the metal flange are in contact with the refrigerant. 9. The multiphase superconducting cable connection structure according to claim 1, wherein the metal flange has a first surface and a second surface that face opposite directions; wherein there is no gap between the first surface and the second surface of the metal flange; and wherein, when a refrigerant is filled into the connection box, the first surface and the second surface of the metal flange are in contact with the refrigerant. 10. A multiphase superconducting cable line comprising: a multiphase superconducting cable connection structure, the multiphase superconducting cable connection structure comprising: a pair of multiphase superconducting cables each including a plurality of cable cores that each have a superconductor; a connection box accommodating a plurality of conductor connects, each of the plurality of conductor connects connecting a superconductor of a corresponding cable core of the plurality of cable cores of one of the pair of multiphase superconducting cables to a superconductor of a corresponding cable core of the plurality of cable cores of another one of the pair of multiphase superconducting cables; a plurality of solid insulation members, each solid insulation member of the plurality of solid insulation members fixed to an outer circumference of a corresponding conductor connect of said plurality of conductor connects; and a metal flange fixing the plurality of solid insulation members to said connection box; wherein each cable core of the plurality of cable cores of the one of the pair of multiphase superconducting cables includes a shield layer surrounding said superconductor of the cable core; wherein the multiphase superconducting cable connection structure further includes a shield connect provided to short circuit shield layers of at least two cable cores of the plurality of cable cores of the one of the pair of multiphase superconducting cables; and wherein the shield connect is formed of an element different from said shield layers of said at least two cable cores. 11. A multiphase superconducting cable connection structure, comprising: a first multiphase superconducting cable having a plurality of cable cores, each of the plurality of cable cores of the first multiphase superconducting cable having a superconductor; a second multiphase superconducting cable having a plurality of cable cores, each of the plurality of cable cores of the second multiphase superconducting cable having a superconductor; a plurality of connection sleeves, each connection sleeve of the plurality of connection sleeves connecting an end of a superconductor of a corresponding cable core of the plurality of cable cores of the first multiphase superconducting cable to an end of a superconductor of a corresponding cable core of the plurality of cable cores of the second multiphase superconducting cable; a plurality of solid insulation members, each solid insulation member of the plurality of solid insulation members fixed to an outer circumference of a corresponding connection sleeve of the plurality of connection sleeves; a connection box accommodating the plurality of solid insulation members; and a metal flange fixing the plurality of solid insulation members to the connection box; wherein each cable core of the plurality of cable cores of the first multiphase superconducting cable further includes a shield layer surrounding the superconductor of the cable core; wherein the multiphase superconducting cable connection structure further comprises a shield connect connected to at least two cable cores of the plurality of cable cores of the first multiphase superconducting cable, the shield connect short circuiting the shield layers of the at least two cable cores; and wherein the shield connect is formed of an element different from said shield layers of said at least two cable cores. 12. The multiphase superconducting cable connection structure of claim 11, wherein the connection box is formed of four or more pieces connected in a longitudinal direction of the first multiphase superconducting cable. 13. The multiphase superconducting cable connection structure of claim 11, wherein each cable core of the plurality of cable cores of the second multiphase superconducting cable further includes a shield layer surrounding the superconductor of the cable core; and wherein the multiphase superconducting cable connection structure further comprises a plurality of shield links, each shield link of the plurality of shield links connecting a shield layer of a corresponding cable core of the plurality of cable cores of the first multiphase superconducting cable to a shield layer of a corresponding cable core of the plurality of cable cores of the second multiphase superconducting cable. 14. The multiphase superconducting cable connection structure of claim 11, wherein the shield connect is formed of a normal-conducting material. 15. The multiphase superconducting cable connection structure of claim 11, wherein said shield connect comprises: a first cylindrical member covering an outer circumference of a first shield layer of said shield layers of said at least two cable cores; a second cylindrical member covering an outer circumference of a second shield layer of said shield layers of said at least two cable cores; and a link member linking the first cylindrical member to the second cylindrical member. 16. The multiphase superconducting cable connection structure of claim 15, wherein the link member is flexible. 17. The multiphase superconducting cable connection structure of claim 15, wherein the link member is formed of braided material that is able to follow a movement of the at least two cable cores when the at least two cable cores are cooled and contract. 18. The multiphase superconducting cable connection structure of claim 15, wherein the first cylindrical member is formed of a normal-conducting material; wherein the second cylindrical member is formed of a normal-conducting material; and wherein the link member is formed of a superconducting material.