JP2010020970A - Connecting structure of superconductive cable core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure of a superconductive cable core which is more miniaturized than that in the prior art. <P>SOLUTION: Th superconductive cable core includes a pair of the superconductive cable cores 10 with a superconductive conductor layer 12 at the outer periphery of a former 11, a connecting sleeve 8 by which ends of the formers 11 of these superconductive cable cores 10 are compressed and connected in a mutually butted state, a connecting superconductive wire material 5 arranged at the outer periphery of the connecting sleeve 8 by which the conductor layers 12 of both cable cores 10 are mutually electrically connected, and a conductive connecting member by which a plurality of the connecting superconductive wire materials are integrated with the connecting sleeve. Then, the connecting structure 1 of this superconductive cable core satisfies a relationship of Sf>Ss≥0.7×Sf when a cross-sectional area of the connecting sleeve 8 after compression at a position where the ends of the formers 11 are mutually butted is Ss and the cross-sectional area of the former 11 at the same position is Sf. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a superconducting cable core connection structure formed by connecting a pair of superconducting cable cores having a superconducting conductor layer on the outer periphery of a former.

  In recent years, it has been proposed to use a superconducting cable having a higher transmission capacity than a normal conducting cable as a power cable. As the superconducting cable, for example, a three-core superconducting cable 100 in which a three-core superconducting cable core 10 as shown in FIG.

  The superconducting cable core 10 includes a former 11, a superconducting conductor layer 12, an insulating layer 13, a superconducting shield layer 14, and a protective layer 15 in order from the center. When such superconducting cables 100 are connected to form a power path, a superconducting cable core connection structure in which the cores 10 included in the cable 100 are connected is formed (for example, Patent Document 1).

  7A and 7B show an example of a superconducting cable core connection structure. FIG. 7A is a partial longitudinal sectional view of the superconducting cable core connection structure, and FIG. In order to form this connection structure C, first, the end portion of the superconducting cable core 10 is stepped off to expose the former 11 and the superconducting conductor layer 12. Next, the exposed end portions of the former 11 are inserted into the former insertion hole 8h of the connection sleeve 80, and the end portions of the former 11 are connected by compressing the connection sleeve 80 from the outer peripheral side. Then, after connecting the superconducting wire 5 for connection to the outer periphery of the connecting sleeve 80 and electrically connecting both ends thereof to both the superconducting conductor layers 12 by soldering or the like, the superconducting wire 5 is connected to a conductive bonding material (for example, , Solder) to be integrated with the connection sleeve 80. Thereafter, a reinforcing insulating layer (not shown) and a shield connection layer (not shown) are formed outside the superconducting wire 5 to cover the outer periphery with a heat insulating structure, thereby completing the connection structure C.

JP 2005-353379 A

  By the way, it has been considered that a cable line using a superconducting cable is mainly laid in place of a normal conductive cable line laid on an existing pipe line. Therefore, in order to secure a working space with sufficient margin when laying the track and during maintenance after laying, the cable track is reduced in size, particularly the connection structure of the superconducting cable core that tends to increase in diameter. It is demanded.

  Here, the connection sleeve must be able to withstand the tension acting on the connection sleeve by the superconducting cable core to be connected, and a thick-walled one is used. Specifically, as shown in FIG. 7B, the cross-sectional area Ss0 of the connection sleeve 80 after compression at the end position of the former 11 is equal to or larger than the cross-sectional area Sf of the former 11 at the same position. The connection sleeve 80 was selected so that Therefore, the connection structure C of the superconducting cable core is apt to increase in diameter.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide a superconducting cable core connection structure that is smaller than the conventional superconducting cable core connection structure.

  The inventor conducted various tests for reexamination of the connection structure of the superconducting cable core. As a result, it has been clarified that if there is a conductive coupling member that integrates the superconducting wire for connection with the connection sleeve, a part of the tension acting on the connection sleeve can be shared by the coupling member. Based on this finding, the present invention is defined below.

The present invention provides a superconducting cable core connection structure comprising a pair of superconducting cable cores provided with a superconducting conductor layer on the outer periphery of the former, and a connection sleeve for compressing and connecting the ends of the formers of the superconducting cable cores. Related. The connection structure of the superconducting cable core according to the present invention is arranged on the outer periphery of the connection sleeve, and connects a superconducting wire for connection that electrically connects the superconducting conductor layers of both cable cores and a plurality of superconducting wires for connection. A conductive coupling member integral with the sleeve. When the cross-sectional area of the connection sleeve after compression at the position where the end portions of the former are abutted is Ss, and the cross-sectional area of the former at the same position is Sf, Ss is in the following range. To do.
Sf> Ss ≧ 0.7 × Sf

  According to the configuration of the present invention, since the cross-sectional area Ss of the connection sleeve is smaller than the conventional one, the connection structure of the superconducting cable core can be downsized.

  Hereinafter, a preferable aspect of the connection structure of the superconducting cable core of the present invention will be described.

  The connection structure of the superconducting cable core according to the present invention preferably includes a reinforcing member that hangs around the outer periphery of the connection sleeve and shares the tension acting on the connection sleeve.

  By making the reinforcing member share the tension acting on the connection sleeve, the connection structure can be more firmly maintained even when the above Ss is smaller than Sf.

  The reinforcing member described above may be disposed between the connecting superconducting wire and the connecting sleeve, or may be juxtaposed in the circumferential direction of the connecting sleeve together with the connecting superconducting wire. In this case, both ends of the reinforcing member are preferably connected to the outer periphery of the former exposed from between the connection sleeve and the end of each superconducting conductor layer.

  In the former case, the position at which the reinforcing member is disposed is a position that does not interfere with the connection of the connecting superconducting wire to the conductive layer of the core. This is because the connecting position of the reinforcing member to the former is shifted inward in the radial direction of the core and closer to the connecting sleeve in the axial direction of the core than the connecting position of the connecting superconducting wire and the conductor layer. is there. Further, since the reinforcing member does not hinder the connection of the connecting superconducting wire to the superconducting conductor layer, for example, the reinforcing member can be provided on the entire circumference of the connection sleeve, and as a result, the core connection structure can be further strengthened. it can. However, in this configuration, the connecting structure of the core is increased by the thickness of the reinforcing member in the radial direction. Therefore, the thickness of the reinforcing member is selected so that the effect of reducing the cross-sectional area of the connecting sleeve compared to the conventional case is not wasted. . The reinforcing member is only for strengthening the core connection structure, so it can be thin, and since it is a separate member from the connecting sleeve, use a material with a higher tensile strength than the sleeve. You can also.

  When the reinforcing member is juxtaposed in the circumferential direction of the connection sleeve together with the connecting superconducting wire, the core connection structure can be further strengthened while maintaining the size of the core connection structure. The reason why the reinforcing member can be juxtaposed with the connecting superconducting wire is that the connecting sleeve has an outer diameter larger than the core diameter up to the conductor layer, so that the connecting superconducting wires are spaced apart on the sleeve. On the other hand, the distance between the connecting superconducting wires decreases from the connecting sleeve toward the conductor layer, but at the position where the distance between the connecting wires decreases, the reinforcing member can be connected to the outer periphery of the former. Crew under the wire (inward of the core in the radial direction). Therefore, the reinforcing member does not interfere with the connection of the connecting superconducting wire to the superconducting conductor layer.

  Further, the reinforcing member may be arranged along the outer peripheral side of the connecting superconducting wire. In this case, not only the tension acting on the connecting sleeve but also the tension acting on the connecting superconducting wire can be reduced. Further, since the connecting superconducting wire can be protected from the outer peripheral side by the reinforcing member, for example, when the reinforcing insulating layer is formed on the outer periphery of the connecting sleeve, the connecting superconducting wire is hardly damaged.

  According to the connection structure of the superconducting cable core of the present invention, the core connection structure can be made smaller than the conventional connection structure of the superconducting cable core because the cross-sectional area Ss of the connection sleeve is reduced.

  Embodiments (Embodiments 1 to 4) according to a superconducting cable core connection structure of the present invention will be described below with reference to the drawings. First, prior to the description of the core connection structure, the configuration of the superconducting cable will be described.

(Embodiment 1)
<Superconducting cable>
As a superconducting cable used for the connection structure of the superconducting cable core of the present invention, a three-core superconducting cable for alternating current will be described.

  FIG. 6 is a cross-sectional view of a three-core collective superconducting cable. The superconducting cable 100 has a three-core superconducting cable core 10 and a heat insulating tube 20 that houses the core 10.

  The core 10 includes, in order from the center, a former 11, a cushion layer (not shown), a superconducting conductor layer 12, an internal semiconductive layer (not shown), an insulating layer 13, an external semiconductive layer (not shown), and a superconducting shield. It has a layer 14 and a protective layer 15. Of these layers, a superconducting wire is used for the conductor layer 12 and the shield layer 14. The superconducting wire constituting the core 10 is maintained in a superconducting state by circulating a refrigerant (for example, liquid nitrogen) in the space between the heat insulating tube 20 and the core 10.

  The former 11 keeps the conductor layer in a predetermined shape, and is also a shunt path for accident current. As the former 11, a pipe-like one or a bundle of strands (for example, a strand obtained by twisting a plurality of strands) can be used. When the former 11 is pipe-shaped, the inside of the former 11 can be a refrigerant flow path. The material of the former 11 is preferably a nonmagnetic metal material such as copper, stainless steel, or aluminum.

  The cushion layer provided on the former 11 can be formed by winding carbon paper around the former 11 in a spiral shape. With this cushion layer, the surface of the former 11 can be smoothed, and damage due to direct contact between the former 11 and the conductor layer 12 can be reduced.

  The conductor layer 12 can be formed by winding a superconducting wire in multiple layers on a cushion layer. Each layer constituting such a conductor layer 12 is usually different in the twist pitch of the superconducting wire. In addition, the current flowing in each layer can be equalized by changing the winding direction for each layer or for each of the plurality of layers. As the superconducting wire constituting the conductor layer 12, bismuth-based superconducting wire (for example, Bi2223-based Ag-Mn sheath tape wire), yttrium-based superconducting wire (for example, YBCO-based thin film wire), or the like can be used.

  The insulating layer 13 can be formed by, for example, winding semi-synthetic paper (PPLP: registered trademark, manufactured by Sumitomo Electric Industries, Ltd.) laminated with kraft paper and a resin film such as polypropylene around the inner semiconductive layer.

  The internal semiconductive layer provided between the conductor layer 12 and the insulating layer 13 and the external semiconductive layer provided between the insulating layer 13 and the shield layer 14 can be formed, for example, by winding carbon paper. . These internal semiconductive layer and external semiconductive layer suppress the generation of minute voids at the interface between the conductor layer 12 and the insulating layer 13 and the interface between the insulating layer 13 and the shield layer 14, respectively. Prevent partial discharge.

  The shield layer 14 provided on the external semiconductive layer can be formed by winding a superconducting wire similar to that used for the conductor layer 12. The shield layer 14 is substantially the same size as the conductor layer 12 and induces a reverse current to substantially cancel the magnetic field generated from the conductor layer 12 and prevent leakage of the magnetic field to the outside. it can.

  The protective layer 15 can be formed, for example, by winding kraft paper. The protective layer 15 mechanically protects the shield layer 14 and insulates it from the heat insulating tube 20.

  On the other hand, the heat insulating tube 20 has a stainless double tube structure having a corrugated inner tube 21 and a corrugated outer tube 22. Usually, a space is formed between the corrugated inner tube 21 and the corrugated outer tube 22, and the space is evacuated. In the space to be evacuated, a super insulation serving as a heat insulating material (not shown) is arranged to reflect radiant heat. An anticorrosion layer 23 made of a resin such as polyvinyl chloride is formed outside the corrugated outer tube 22.

<Connection structure of superconducting cable core>
FIG. 1A is a partial longitudinal sectional view showing a superconducting cable core connection structure 1 formed by connecting the cable cores of the above-described superconducting cables, and FIG. 1B is a sectional view taken along line XX in FIG. FIG. In FIG. 1, only the former 11 and the superconducting conductor layer 12 are shown as constituent members of the core 10. This also applies to FIGS. 2 to 5 used when explaining each of Embodiments 2 to 5 described later.

  The superconducting cable core connection structure 1 includes a pair of cores 10 and a connection sleeve 8 for compressing and connecting the ends of the formers 11 of the cores 10 to each other. The connection sleeve 8 is a cylindrical member having a former insertion hole 8h that can accommodate the end portion of the former 11, and can be formed of a nonmagnetic metal material such as copper or aluminum, for example. When the connection structure 1 is constructed, the connection sleeve 8 is compressed in a state where the former 11 is accommodated in the former insertion hole 8h. As a result, the formers 11 are connected to each other inside the connection sleeve 8.

  On the outer periphery of the connection sleeve 8, a superconducting wire 5 for connection for electrically connecting the superconducting conductor layers 12 of both cable cores 10 is disposed. The superconducting wire 5 is preferably the same as the superconducting wire constituting the conductor layer 12. The connection between the superconducting wire 5 and the conductor layer 12 is preferably performed by a conductive adhesive 7 (for example, Sn-Ag solder). If the conductive adhesive 7 is applied to both ends of the superconducting wire 5 in advance, the superconducting wire 5 can be easily attached.

  The number of superconducting wires 5 is the same as the number of superconducting wires constituting the one conductor layer 12, or one or two less than the number of superconducting wires constituting the one conductor layer 12. Is preferred. These superconducting wires 5 may be integrated by a fixing member suspended in a direction intersecting the axial direction of the wires 5 in a parallel state before being connected to the conductor layer 12. In this case, when the superconducting wire 5 is attached to the conductor layer 12, the superconducting wire 5 can be easily positioned, and a plurality of superconducting wires 5 can be attached to the outer periphery of the connection sleeve all at once. After connecting the superconducting wire 5 as an integrated product to the conductor layer 12, the fixing member may be removed. The fixing member is preferably made of a material having excellent heat resistance and insulation, and for example, a tape-shaped or linear material such as Kapton tape (trade name) or glass tape can be used. In addition, the fixing member may be a flexible sheet.

  The connecting superconducting wire 5 is integrated with the connecting sleeve 8 by a conductive coupling member (not shown), for example, Sn-Ag solder material. The conductive coupling member enters not only between the superconducting wire 5 and the connection sleeve 8 but also between the superconducting wires 5 and integrates all the superconducting wires 5 into the connection sleeve 8 at once. As a result, both end portions of the connecting superconducting wire 5 are substantially formed in a conical surface, and an intermediate portion thereof is formed in a substantially cylindrical surface. This conductive coupling member can prevent the superconducting wire 5 from being detached from the sleeve 8. Further, since the conductive coupling member shares the tension of the core 10 acting on the connection sleeve 8, it is possible to use the connection sleeve 8 having a smaller outer diameter of the cylinder, that is, a cross-sectional area than the conventional one.

  The dimensions of the connection sleeve 8 in this embodiment will be specifically described. First, when the cross-sectional area Ss of the connection sleeve 8 after compression at the position where the ends of the former 11 are abutted, and the cross-sectional area of the former at the same position (≈the area of the end face) Sf, Sf> Ss ≧ 0. The relationship of 7 × Sf is satisfied. That is, in the conventional superconducting cable core connection structure C shown in FIG. 7B, the cross-sectional area Ss0 of the connection sleeve 80 is larger than the cross-sectional area Sf of the former 11, whereas this embodiment shown in FIG. In the superconducting cable core connection structure 1, Ss is smaller than Sf.

  On the outer periphery of the configuration shown in FIG. 1, a reinforcing insulating layer, a superconducting wire that connects the shield layers of the core 10, and the like are disposed. Since the formation after the reinforcing insulating layer is the same as the conventional one, the description thereof is omitted.

  The superconducting cable core connection structure 1 formed as described above is smaller than the conventional core connection structure because the outer diameter of the connection sleeve 8 used in the connection structure 1 is smaller than the conventional one.

<Tensile test>
A simulated structure having the same configuration as that of the first embodiment described above was produced, and whether or not the connection structure was maintained by applying tension acting on the core connection structure during the operation of the superconducting cable line was actually tested. .

The former used in the test was a stranded wire obtained by twisting copper strands, and the cross-sectional area Sf after compression was about 140 mm ² . The former had a tensile strength of about 7 kg / mm ² . For such a former, a connection sleeve having a cross-sectional area Ss after compression that decreases in steps of about 150 mm ² to 5 mm ² was prepared and tested. As a result, if Ss is in the range of about 150 to 100 mm ² (≈1.07 Sf to 0.71 × Sf), the connection structure is maintained well, and if Ss is 95 mm ² (≈0.67 × Sf). There were problems such as elongation of the sleeve, and there was anxiety in the connection structure.

(Embodiment 2)
In the second embodiment, in addition to the configuration of the first embodiment, an example in which a reinforcing member that shares tension acting on the connection sleeve by the superconducting cable core is provided will be described with reference to the drawings. In this Embodiment 2, the same code | symbol is attached | subjected to the structure which is common in Embodiment 1, and the description is abbreviate | omitted.

  2A is a partial cross-sectional view of the superconducting cable core connection structure 2 according to the second embodiment, and FIG. 2B is a YY cross-sectional view of FIG.

  The superconducting cable core connection structure 2 has a reinforcing member 6 that is suspended on the outer periphery of the connection sleeve 8 and shares the tension acting on the connection sleeve 8. The reinforcing member 6 is disposed between the connecting superconducting wire 5 and the connecting sleeve 8, and both ends thereof are connected to the outer periphery of the former 11 exposed between the connecting sleeve 8 and the end of the conductor layer 12. . The connection between the reinforcing member 6 and the connection sleeve 8 may be performed by, for example, solder.

  The thickness of the reinforcing member 6 is selected so that the length obtained by adding the outer diameter of the connection sleeve 8 and the thickness of the reinforcing member 6 (L in FIG. 2B) is smaller than the outer diameter of the conventional sleeve. Just do it. The core connection structure 2 is larger than that of the first embodiment by the amount of the reinforcing member 6.

  The reinforcing member 6 may be formed of the same material as the connection sleeve 8 (for example, copper or aluminum), or may be formed of another material. In particular, when a material having a higher tensile strength than the sleeve 8 such as stainless steel is used, a high reinforcing effect can be obtained even if the reinforcing member 6 is thin. In addition, the reinforcing member 6 may have plating on the surface for improving the adhesion with the sleeve 8.

  It is preferable that the reinforcing member 6 before the attachment has a form in which a plurality of reinforcing members 6 are integrated by a fixing member, like the superconducting wire 5 for connection. With such a configuration, attachment of the reinforcing member 6 to the former 11 is facilitated.

  According to the configuration of the second embodiment described above, since the reinforcing member 6 shares the tension acting on the connection sleeve 8, the core connection structure 2 can be further strengthened. Furthermore, by providing the reinforcing member, it is possible to reduce work size tolerances and variations in construction during assembly work. Further, in this configuration, since the reinforcing member 6 is disposed on the inner side of the core 10 than the connecting superconducting wire 5, the reinforcing member 6 is used when the superconducting wire 5 is connected to the conductive layer 12 of the core 10. It won't get in the way.

(Embodiment 3)
Embodiment 3 demonstrates the example which provided the reinforcement member 6 demonstrated in Embodiment 2 in the position different from the connection structure of the superconducting cable core of Embodiment 2 based on figures.

  FIG. 3A is a partial longitudinal sectional view of the superconducting cable core connection structure 3 according to Embodiment 3, and FIG. 3B is a ZZ sectional view of FIG. Hereinafter, the arrangement of the reinforcing member 6 will be mainly described.

  In this embodiment, the reinforcing member 6 is juxtaposed in the circumferential direction of the connecting sleeve 8 together with the connecting superconducting wire 5. The combination of the number of superconducting wires 5 for connection and the number of reinforcing members 6 and the parallel order of the superconducting wires 5 and the reinforcing members 6 may be appropriately selected. The reason why the reinforcing member 6 and the superconducting wire 5 can be arranged in parallel is that the interval between the superconducting wires 5 is widened by the connection sleeve 8. Further, the distance between the superconducting wires 5 decreases from the connection sleeve 8 toward the conductor layer 12, but the reinforcing member 6 gets under the superconducting wire 5 toward the conductor layer 12. Therefore, the reinforcing member 6 does not hinder the superconducting wire 5 from being connected to the conductor layer 12.

  The superconducting wire 5 and the reinforcing member 6 described above may be integrated with a fixing member in a parallel state. In this case, the superconducting wire 5 and the reinforcing member 6 can be easily attached when the core connection structure 3 is formed. Specifically, the integrated product is wound around the outer periphery of the connection sleeve 8, and the reinforcing member 6 is first connected to the outer periphery of the former 11. The superconducting wire 5 is preferably connected to the conductor layer 12 of the core 10.

  According to the configuration of the third embodiment described above, it is a connection structure of a superconducting cable core having the same size as that of the first embodiment, and a connection structure stronger than the connection structure can be obtained.

(Embodiment 4)
Embodiment 4 demonstrates the example which provided the reinforcement member 6 in the position different from the connection structure of the superconducting cable core of Embodiment 2,3 based on a figure.

  4A is a partial longitudinal sectional view of the superconducting cable core connection structure 4 according to the fourth embodiment, and FIG. 4B is a WW sectional view of FIG. Hereinafter, the arrangement of the reinforcing member 6 will be mainly described.

  In this embodiment, the reinforcing member 6 is disposed along the outer peripheral side of the connecting superconducting wire 5. This reinforcing member 6 serves not only to share the tension acting on the connection structure 4 but also to protect the superconducting wire 5 mechanically.

  The reinforcing member 6 illustrated in this embodiment has the same length and the same width as the superconducting wire 5 and is superposed on the superconducting wire 5. When the reinforcing member 6 and the superconducting wire 5 are bonded with an adhesive or the like, the reinforcing member 6 can effectively share the tension acting on the superconducting wire 5. When the reinforcing member 6 and the superconducting wire 5 are joined and then integrated by the fixing member, the superconducting wire 5 and the reinforcing member 6 are attached when the core connection structure 4 is formed as in the third embodiment. Becomes easier.

  The reinforcing member 6 may have a size different from that of the superconducting wire 5. For example, the reinforcing member 6 may be longer than the superconducting wire 5, and in this case, both ends of the reinforcing member 5 may be connected to the superconducting layer 12. In addition, the reinforcing member 6 may be wider than the superconducting wire 5, and in that case, the reinforcing member 6 may connect two adjacent superconducting wires 5. Further, the number of the reinforcing members 6 may be selected as appropriate, but it is preferable that any one of the reinforcing members 6 is along any one of the superconducting wires 5.

  According to the configuration of the fourth embodiment described above, a strong connection structure can be obtained, and the reinforcing member 6 covers the outer periphery of the superconducting wire 5. Therefore, for example, when a reinforcing insulating layer is formed on the outer periphery of the connecting sleeve 8 Moreover, it is possible to prevent the superconducting wire 5 from being mechanically damaged.

(Embodiment 5)
In the fifth embodiment, a connection structure of a superconducting cable core having a multilayer superconducting conductor layer will be described with reference to FIG.

  FIG. 5A shows a superconducting cable core 10 including three superconducting conductor layers 12 (inner peripheral layer 12a, intermediate layer 12b, and outer peripheral layer 12c), a superconducting wire 5 (5a-5c) for connection having a multilayer structure, and It is a fragmentary sectional view explaining the correspondence with the integrated object of the reinforcing member. FIG. 5B is a cross-sectional view taken along the line AA of the integrated body shown in FIG. In this case, the conductor layer 12 is exposed stepwise so that the end of the inner peripheral layer 12 a is close to the end of the former 11 and the end of the outer peripheral layer 12 c is far from the end of the former 11.

  On the other hand, the connecting superconducting wire 5 has a laminated structure so as to correspond to the stepped structure of the conductor layer 12. Specifically, the superconducting wire 5a corresponding to the inner peripheral layer 12a is short and the superconducting wire 5c corresponding to the outer peripheral layer 12c is long. The superconducting wire 5b corresponding to the conductor layer 12b has a length intermediate between the wires 5a and 5c. These laminated superconducting wires 5a to 5c may be joined in advance with conductive adhesives 71 and 72 (for example, solder).

  On the other hand, the reinforcing member 6 is configured to be laminated together with the superconducting wires 5b and 5c, and is arranged in parallel with the superconducting wire 5a on the outer periphery of the connection sleeve 8. The length of the reinforcing member 6 is made shorter than the superconducting wire 5a so as not to obstruct the connection of the superconducting wires 5a to 5c with the conductor layers 12a to 12c. The reinforcing member 6 may be arranged in parallel with the superconducting wire 5a alone without forming a laminated structure with the superconducting wires 5b and 5c. In this case, the thickness of the reinforcing member 6 can be appropriately selected within a range obtained by adding the thicknesses of the superconducting wires 5a to 5c and the thicknesses of the adhesives 71 and 72.

  It is preferable that the laminated body of the superconducting wires 5a to 5c and the laminated body of the reinforcing member 6 and the superconducting wires 5b and 5c are integrated with an appropriate fixing member 9 in parallel. When attaching a unit integrated with an appropriate fixing member 9, the integrated member is disposed on the outer periphery of the connection sleeve 8, and the reinforcing member 6 is fixed to the outer periphery of the connection sleeve 8. Then, the superconducting wire 5a and the conductor layer 12a, the superconducting wire 5b and the conductor layer 12b, the superconducting wire 5c and the conductor layer 12c are connected in this order. By setting it as such a structure, the connection structure of a superconducting cable can be strengthened with the reinforcement member 6, and the conductor layers 12a-12c of the core 10 which faced can be connected.

  The embodiments of the present invention are not limited to the above-described embodiments, and modifications and changes can be made as appropriate without departing from the gist of the invention.

  The connection structure of the superconducting cable core of the present invention can be suitably used for a superconducting cable line laid in a place where the installation space is limited.

(A) is the fragmentary longitudinal cross-sectional view which shows typically the connection structure of the superconducting cable core which concerns on Embodiment 1, (B) is XX sectional drawing of (A). (A) is the fragmentary longitudinal cross-sectional view which shows typically the connection structure of the superconducting cable core which concerns on Embodiment 2, (B) is YY sectional drawing of (A). (A) is the fragmentary longitudinal cross-sectional view which shows typically the connection structure of the superconducting cable core which concerns on Embodiment 3, (B) is ZZ sectional drawing of (A). (A) is the fragmentary longitudinal cross-sectional view which shows typically the connection structure of the superconducting cable core which concerns on Embodiment 4, (B) is WW sectional drawing of (A). (A) is the schematic explaining the connection of the superconducting cable core provided with a multilayer superconducting conductor layer, and the integrated thing of the superconducting wire for a connection of a multilayer structure, and a reinforcement member. (B) is AA sectional drawing of the integrated object shown to (A). It is a cross-sectional view of a three-core batch type superconducting cable. (A) is the fragmentary longitudinal cross-sectional view which shows typically the connection structure of the conventional superconducting cable core, (B) is PP sectional drawing of (A).

Explanation of symbols

1, 2, 3, 4, C Superconducting cable core connection structure 5, 5a, 5b, 5c Superconducting wire for connection 7, 71, 72 Conductive adhesive 6 Reinforcement member 8, 80 Connection sleeve 8h Former insertion hole 9 Fixing member DESCRIPTION OF SYMBOLS 100 Superconducting cable 10 Superconducting cable core 11 Former 12, 12a, 12b, 12c Superconducting conductor layer 13 Insulating layer 14 Superconducting shield layer 15 Protective layer 20 Thermal insulation pipe 21 Inner pipe 22 Outer pipe 23 Corrosion-proof layer Ss, Ss0 Cross section Sf Cross section of former after compression

Claims (5)

A superconducting cable core connection structure comprising a pair of superconducting cable cores provided with a superconducting conductor layer on the outer periphery of the former, and a connection sleeve for compression connection in a state where the ends of the formers of these superconducting cable cores are butted together.
A superconducting wire for connection that is disposed on the outer periphery of the connection sleeve and electrically connects the superconducting conductor layers of both cable cores;
A conductive coupling member that integrates the connecting superconducting wire with a connection sleeve;
Superconductivity characterized in that Ss is in the following range, where Ss is the cross-sectional area of the connection sleeve after compression at the position where the ends of the former are abutted, and Sf is the cross-sectional area of the former at the same position. Cable core connection structure.
Sf> Ss ≧ 0.7 × Sf A reinforcing member that is suspended on the outer periphery of the connection sleeve and shares the tension acting on the connection sleeve;
2. The superconducting cable core connection structure according to claim 1, wherein both ends of the reinforcing member are connected to the outer periphery of the former exposed from between the connection sleeve and the end of each superconducting conductor layer.   The superconducting cable core connection structure according to claim 2, wherein the reinforcing member is disposed between the connecting superconducting wire and a connecting sleeve.   The superconducting cable core connection structure according to claim 2, wherein the reinforcing member is juxtaposed in the circumferential direction of the connection sleeve together with the superconducting wire for connection. A reinforcing member that is suspended on the outer periphery of the connection sleeve and shares the tension acting on the connection sleeve;
2. The superconducting cable core connection structure according to claim 1, wherein the reinforcing member is disposed along an outer peripheral side of the connection superconducting wire. 3.

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