JP2016195484A - Terminal structure of superconducting cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure of a superconducting cable capable of reducing the installation space by making compact, and capable of reducing heat intrusion.SOLUTION: A terminal structure of a superconducting cable includes a superconducting cable including a superconductor layer, and a conductor insulation layer provided thereon, a refrigerant tank to be filled with a refrigerant for cooling the end of the superconducting cable, an electric field relaxation part provided on the outer periphery of the conductor insulation layer, and disposed in the refrigerant tank, a lead part connected electrically with the end of the superconductor layer exposed by being stripped, and a vacuum tank disposed on the outer periphery of the refrigerant tank, coaxially with the superconductor cable at a position corresponding to the electric field relaxation part, and the inside of which is brought into vacuum state during operation. The refrigerant tank is an insulation tube, and the vacuum tank has a porcelain tube disposed coaxially with the superconducting cable at a position corresponding to the electric field relaxation part, on the outer periphery of the refrigerant tank.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal structure such as a terminal connection portion of a superconducting cable.

  Conventionally, a superconducting cable using a superconducting wire that becomes a superconducting state at an extremely low temperature as a conductor is known. The superconducting cable is expected as a power cable capable of transmitting a large current with a low loss, and is being developed for practical use.

  A superconducting cable having a structure in which a single-core or multiple-core cable core is accommodated in a heat insulating tube is known. The single-core cable core includes, for example, a former, a superconducting conductor layer, an electrical insulating layer, a cable shield layer, and a protective layer in order from the center. As a cable core, a coaxial cable core having a plurality of superconducting conductor layers arranged concentrically alternately on the outer periphery of the former and having a superconducting conductor layer and an electrical insulating layer arranged concentrically is known.

  The heat insulation pipe includes an inner pipe (hereinafter referred to as “heat insulation inner pipe”) in which the cable core is accommodated and filled with a refrigerant (for example, liquid nitrogen), and an outer pipe (hereinafter referred to as “heat insulation outer pipe”) covering the outer periphery of the heat insulation inner pipe. Have Between the heat insulating inner tube and the heat insulating outer tube, a vacuum state is set for heat insulation.

  In a terminal structure applied to a terminal connection portion of a superconducting cable, the terminal portion of the superconducting cable is accommodated in a low temperature container serving as a low temperature portion, and a conductor (for example, a superconducting conductor layer) of the superconducting cable is passed through a conductor lead-out portion. It is pulled out to the room temperature part. The cryogenic container has a double structure composed of a refrigerant tank that accommodates the terminal portion of the superconducting cable and is filled with a refrigerant such as liquid nitrogen during operation, and a vacuum tank that accommodates the refrigerant tank and is in a vacuum state during operation.

  Specifically, as shown in Patent Document 1 and Patent Document 2, in the conventional superconducting cable terminal structure, the cryogenic container is directed upward from the vacuum tank body to the vacuum tank body that houses the refrigerant tank. And has a cylindrical portion that is vertically suspended. The refrigerant tank accommodates a terminal portion of a superconducting cable disposed horizontally, and a conductor (for example, a superconducting conductor layer) in the terminal portion is connected to a lower end portion of a conductor lead-out portion suspended in the cylindrical portion. Yes. The conductor lead-out rod is configured to be inserted through a cylindrical insulating tube (insulation tube) disposed on the cylindrical portion and to be drawn from the upper end portion of the insulating tube to the outside from above.

JP 2005-253204 A JP 2013-150545 A

  However, in the techniques described in Patent Document 1 and Patent Document 2, which are conventional terminal structures, the cryogenic vessel is not limited to the vacuum chamber body extending in the horizontal direction, but the cylindrical portion surrounding the conductor extraction rod is vacuumed. Because it is a structure that hangs upward from the tank main body, when installing the terminal structure, in addition to the installation area of the vacuum main body, secure the installation area of the tubular part and the insulating tube above. There is a need. In addition, when the terminal structure itself is enlarged, the conductor extraction rod serving as a heat transfer path becomes longer, and there is a concern that heat penetration into the refrigerant tank increases.

  Thereby, as a terminal structure of a superconducting cable, it is desired to make the terminal structure itself more compact by making the cryogenic container smaller.

  An object of the present invention is to provide a terminal structure of a superconducting cable that can reduce the installation space and reduce heat intrusion by reducing the size.

A terminal structure of a superconducting cable according to the present invention is a superconducting cable comprising a superconducting conductor layer and a conductor insulating layer provided on the superconducting conductor layer,
A refrigerant tank filled with a refrigerant that cools a terminal portion of the superconducting cable; and
An electric field relaxation portion provided on an outer periphery of the conductor insulating layer and disposed in the refrigerant tank;
A lead portion electrically connected to an end portion of the superconducting conductor layer exposed by being stepped off at a terminal portion of the superconducting cable;
Containing the refrigerant tank, and a vacuum tank whose inside is evacuated during operation;
With
The refrigerant tank is formed of an insulating tube,
The vacuum tank has a configuration in which an outer periphery of the refrigerant tank has a insulator pipe disposed at a position corresponding to the electric field relaxation portion and coaxially with the superconducting cable.

  According to the present invention, the terminal structure of a superconducting cable that can reduce installation space and reduce heat intrusion can be realized by downsizing.

The figure which shows the terminal structure which concerns on one embodiment of this invention Sectional drawing which shows schematic structure of the superconducting cable in the terminal structure which concerns on one embodiment of this invention The figure which shows the principal part structure containing the insulator pipe part of the terminal structure which concerns on one embodiment of this invention The perspective view which shows the principal part structure of the connection electrode part of the lead part of the terminal structure which concerns on one embodiment of this invention The front end side perspective view which shows the principal part structure of the connection electrode part of the lead part of the terminal structure which concerns on one embodiment of this invention The figure which shows the connection part of a cryogenic container and the heat insulation pipe | tube of a superconducting cable in the terminal structure which concerns on one embodiment of this invention. The perspective view which shows the principal part structure of the internal holding member in the terminal structure which concerns on one embodiment of this invention The perspective view which shows the modification 1 of the connection electrode part of the terminal structure which concerns on one embodiment of this invention The perspective view which shows the modification 2 of the connection electrode part of the terminal structure which concerns on one embodiment of this invention The perspective view which shows the modification 3 of the connection electrode part of the terminal structure which concerns on one embodiment of this invention The perspective view which shows the modification 4 of the connection electrode part of the terminal structure which concerns on one embodiment of this invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a terminal structure 1 according to an embodiment of the present invention. For convenience of explanation, the side where the superconducting cable 10 is introduced will be described as the rear end side (right side in FIG. 1), and the opposite side will be described as the front end side (left side in FIG. 1 and also referred to as the insertion direction side).

  As shown in FIG. 1, the terminal structure 1 includes a terminal part of the superconducting cable 10, a connection electrode part 13, an electric field relaxation part 15, a cryogenic container 20 having a refrigerant tank 21 and a vacuum tank 22, and a lead part 30. And a shield energization part 40 and a support leg part (support part) 28. The terminal of the superconducting cable 10 is accommodated in the cryogenic container 20 (specifically, the refrigerant tank 21) so as to extend in the horizontal direction in a predetermined state, and the conductor of the superconducting cable 10 is connected via the connection electrode part 13 and the lead part 30. Current is drawn to the real system side such as power equipment. In addition, the cable shield layer 114 of the superconducting cable 10 is grounded via the shield energization unit 40. The superconducting cable 10 of the present embodiment has a multi-layer superconducting conductor layer, and in the terminal structure 1, the superconducting cable 10 arranged in a substantially horizontal direction is spaced from the superconducting conductor layer by a predetermined interval in the horizontal direction. A conductor current is drawn through the connection electrode portion 13 and the lead portion 30.

  FIG. 2 is a cross-sectional view showing a schematic configuration of the superconducting cable in the terminal structure according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the superconducting cable 10 includes a superconducting conductor layer 112 in a heat insulating tube 12 via an electric insulating layer (conductor insulating layer) 113 (113-1, 113-2, 113-3). This is a superconducting cable in which a cable core 11 having a plurality of concentric circles (112-1, 112-2, 112-3) is accommodated. The superconducting cable 10 may be a multiphase superconducting cable that allows currents having different phases to flow in each superconducting conductor layer. Here, a superconducting conductor layer is a three-phase superconducting cable having three layers on the same axis as conductors through which U-phase, V-phase, and W-phase currents flow from the center.

The cable core 11 includes, for example, a central cooling pipe 111, which is an N ₂ cooling pipe, a first superconducting conductor layer 112-1, a first electric insulating layer (conductor insulating layer) 113-1, and a second superconducting conductor layer 112 in order from the center. -2, second electrical insulation layer (conductor insulation layer) 113-2, third superconducting conductor layer 112-3, third electrical insulation layer (conductor insulation layer) 113-3, cable shield layer 114, protective layer 115, etc. Have

  Each superconducting conductor layer 112 and cable shield layer 114 are composed of, for example, a large number of superconducting tapes (tape-shaped superconducting wires) wound spirally around the outer surface of the lower layer. The superconducting tapes constituting the superconducting conductor layer are arranged without overlapping each other.

Here, the superconducting tape is a REBa _y Cu ₃ O _z system (RE represents one or more elements selected from Y, Nd, Sm, Eu, Gd, and Ho, and y ≦ 2 and z = 6.2. It is an oxide superconducting material provided with the high-temperature superconducting thin film. In this superconducting tape, an oxide superconducting layer (hereinafter referred to as “superconducting layer”), which is a tape-like superconducting thin film, and a stabilizing layer are laminated in this order on an intermediate layer formed on a tape-like metal substrate. It is produced by doing. The metal substrate of the superconducting tape is nickel (Ni), nickel alloy, stainless steel, or silver (Ag). In addition, the intermediate layer is formed of, for example, an aluminum oxide (Al ₂ O ₃ ) layer, a gallium-doped zinc oxide layer (Gd ₂ Zr ₂ O ₇ : GZO), or a yttrium-stabilized zirconia (YSZ) layer on a metal substrate. One layer, a _second layer that is a layer such as Y ₂ O ₃ or LaMnO _{3, a third} layer that is composed of magnesium oxide (MgO), a fourth layer that is a layer such as lanthanum manganese oxide (LaMnO ₃ ), cerium oxide ( The fifth layer, which is a CeO ₂ ) layer, is laminated in order.

  The superconducting layer is made of an organic metal salt or an organic metal compound as a raw material, and is formed on the intermediate layer by a MOD method (Metal Organic Deposition Processes) without using a vacuum process. In the MOD method, a metal organic acid salt on a composite substrate provided with an intermediate layer on a metal substrate is heated and thermally decomposed to form a thin film as a superconducting layer on the composite substrate.

  The electrical insulating layer 113 is configured by, for example, winding semi-synthetic insulating paper around the outer periphery of the lower superconducting conductor layer 112.

  The protective layer 115 is configured, for example, by winding kraft paper or the like around the outer periphery of the cable shield layer 114.

  At the terminal portion of the superconducting cable 10, as shown in FIG. 1, the cable core 11 is stepped, and the layers are exposed in order from the tip side. Each superconducting conductor layer 112 (112-1, 112-2, 112-3) has a connecting electrode portion 13 that is electrically connected to each superconducting conductor layer 112 (112-1, 112-2, 112-3). (13-1, 13-2, 13-3) are connected. Here, the connection electrode portion 13 is disposed on the outer periphery of the superconducting conductor layer 112. A shield connection terminal 14 that is electrically connected to the cable shield layer 114 is disposed on the outer periphery of the cable shield layer 114. On the outer periphery of the electrical insulating layer 113 (113-1, 113-2, 113-3) disposed on the outer periphery of the superconducting conductor layer 112 (112-1, 112-2, 112-3), there is an electric field such as a stress cone. Relaxation part 15 (15-1, 15-2, 15-3) is arranged. Specifically, the electric field relaxation part 15-1 is arrange | positioned on the outer periphery of the electric insulation layer 113-1 located between the connection electrode part 13-1 and the connection electrode part 13-2. An electric field relaxation portion 15-2 is disposed on the outer periphery of the electrical insulating layer 113-2 located between the connection electrode portion 13-2 and the continuous electrode portion 13-3. An electric field relaxation portion 15-3 is disposed on the outer periphery of the electrical insulating layer 113-3 located between the connection electrode portion 13-3 and the shield connection terminal 14.

  The heat insulating tube 12 has a double tube structure including an inner heat insulating inner tube 121 and an outer heat insulating outer tube 122. The heat insulating inner tube 121 and the heat insulating outer tube 122 preferably have a corrugated shape. The heat insulation inner pipe 121 and the heat insulation outer pipe 122 are each configured by, for example, a corrugated pipe (corrugated pipe) made of stainless steel (SUS).

  The heat insulating inner pipe 121 accommodates the cable core 11 and is filled with a refrigerant (for example, liquid nitrogen) during operation. Thereby, the superconducting conductor layer 112 is maintained in a superconducting state. A space between the heat insulating inner pipe 121 and the heat insulating outer pipe 122 is kept in a vacuum state during operation for heat insulation.

  As described above, the superconducting cable 10 has a configuration in which a superconducting conductor layer and a heat insulating tube having a double structure of a heat insulating inner tube and a heat insulating outer tube, which are corrugated tubes, are sequentially provided on the outer peripheral side of the former.

  The cryogenic container 20 has a double structure including an inner refrigerant tank 21 and an outer vacuum tank 22.

  The refrigerant tank 21 has a hollow cylindrical shape, for example, and accommodates the terminal portion of the superconducting cable 10. The refrigerant tank 21 is an insulating tube made of an insulating material such as epoxy resin or fiber reinforced plastics (FRP). That is, the terminal portion of the superconducting cable 10 is accommodated in the insulating tube that is the refrigerant tank 21. The refrigerant tank 21 includes an inner conductor through portion (referred to as an “inner through portion”) 214 (214-1, 214-2, 214-3) for introducing the lead portion 30 and a shield inner through portion for introducing the shield energizing portion 40. 216. The refrigerant tank 21 may be placed on a gantry (not shown) disposed in the vacuum tank 22, for example.

  A terminal portion of the superconducting cable 10 is introduced into the refrigerant tank 21 from the rear end side. A heat insulating inner pipe 121 of the superconducting cable 10 is connected to the rear end surface 212 of the rear end portion of the refrigerant tank 21. Further, the cable core 11 in the heat insulating inner pipe 121 is inserted into the refrigerant tank 21. The refrigerant is circulated and supplied to the refrigerant tank 21 by a refrigerant circulation device (not shown) during operation. The inside of the heat insulating inner pipe 121 communicating with the refrigerant tank 21 is also filled with the refrigerant. In the present embodiment, the heat insulating inner tube 121 is connected to the rear end portion (rear end surface 212) via an internal flange portion 74 attached to the front end portion. Regarding the connection between the rear end surface 212 of the refrigerant tank 21 and the heat insulation inner pipe 121 of the heat insulation pipe 12 in the superconducting cable 10, the rear end part (rear end side pipe part) of the vacuum tank 22 and the heat insulation outer pipe 122 of the superconducting cable 10. The connection structure between the cryogenic vessel 20 and the heat insulation pipe 12 will be described in detail later.

  A conductor relay portion 32 (see FIG. 3) of the lead portion 30 is attached to the inner through portion 214 of the refrigerant tank 21. The conductor relay portion 32 is airtightly attached to the inner through portion 214 via an insulating spacer made of an insulating material such as epoxy resin or FRP. That is, the refrigerant tank 21 and the vacuum tank 22 are partitioned by the insulating spacer and the conductor relay portion 32, and the refrigerant tank 21 is sealed airtight and watertight.

  The vacuum tank 22 has a hollow cylindrical shape, for example, and accommodates the refrigerant tank 21. The vacuum tank 22 is disposed so as to surround the refrigerant tank 21. The vacuum chamber 22 is a pipe portion 23 (23-1, 23-2) disposed coaxially with the superconducting cable 10 at a position corresponding to the electric field relaxation portion 15 (15-1, 15-2, 15-3). , 23-3) and outer conductor penetrating portions (referred to as “outer penetrating portions”) 224 (224-1, 242-2, 224-3). The outer through portion 224 is connected to the distal end side in the axial direction of the insulator tube portion 23.

  FIG. 3 is a diagram showing a configuration of a main part including the insulator pipe part 23 of the terminal structure 1 according to the embodiment of the present invention. In addition, since each insulator pipe part 23-1,23-2,23-3 is comprised similarly, it demonstrates as the insulator pipe part 23. FIG. Also, the relationship between the insulator tube portion 23-1, the superconducting conductor layer 112-1, the connection electrode portion 13-1, the electrical insulating layer 113-1, and the electric field relaxation portion 15-1, the insulator tube portion 23-2, and the superconducting conductor layer. 112-2, connection electrode portion 13-2, electrical insulation layer 113-2, and electric field relaxation portion 15-2, and insulator tube portion 23-3, superconducting conductor layer 112-3, connection electrode portion 13-3, electrical The relationship between the insulating layer 113-3 and the electric field relaxation unit 15-3 is the same. Therefore, the following description will be made using the superconducting conductor layer 112, the connection electrode portion 13, the electrical insulating layer 113, and the electric field relaxation portion 15 together with the insulator tube portion 23.

  The insulator tube portion 23 (23-1, 23-2, 23-3) is constituted by, for example, a polymer insulator tube or a porcelain insulator tube. Here, the description will be made assuming that the insulator tube portion 23 is constituted by a polymer insulator tube.

  As shown in FIG. 3, the insulator tube portion 23 includes an insulating cylinder 232 and a polymer cover 234. The insulating cylinder 232 is made of FRP (fiber reinforced plastic) having high mechanical strength, and is disposed around the electric field relaxation unit 15 attached to the superconducting cable 10 in the refrigerant tank 21 at a position surrounding the electric field relaxation unit 15. . The polymer cover 234 is made of a material excellent in electrical insulation performance, for example, a polymer material such as silicone polymer (silicone rubber). The polymer cover 234 is provided on the outer periphery of the insulating cylinder 232, and a plurality of umbrella-shaped ridges are formed on the outer peripheral surface of the polymer cover 234 so as to be separated in the longitudinal direction. The inside of the insulator tube part 23 (inside the insulating cylinder 232) is hollow.

  The inside of the insulator tube section 23 is evacuated during operation to be in a vacuum state. In the present embodiment, the insulator tube portion 23 surrounds the electric field relaxation portion 15 provided in the cable core 11 (specifically, the outer periphery of the electric insulation layer 113) in the refrigerant vessel 21 which is an insulating tube, and is in the refrigerant vessel. Since it is arrange | positioned on the outer side of 21, the vacuum heat insulation part can be ensured large. Thereby, the heat penetration | invasion which penetrates into the refrigerant tank 21 from the outside via the lead part 30 can be reduced.

  An external terminal portion 34 of the lead portion 30 is attached to the outer through portion 224 of the vacuum chamber 22. The external terminal portion 34 is airtightly attached to the outer through portion 224 via an insulating spacer made of an insulating material such as epoxy resin or FRP. That is, the vacuum chamber 22 is hermetically and watertightly sealed by the insulating spacer and the external terminal portion 34.

  The vacuum chamber 22 is positioned so that the inner through-hole 214 is positioned below the outer through-hole 224 and the shield inner through-hole 216 is positioned below the outer shield through-hole 226 (see FIG. 1). Thus, the refrigerant tank 21 is arranged. A heat insulating outer tube 122 of the superconducting cable 10 is connected to the rear end surface 222 (see FIG. 1) of the vacuum chamber 22. In the present embodiment, the heat insulating outer tube 122 is connected to the rear end surface 222 of the vacuum chamber 22 via an external flange portion 84 (see FIG. 1) attached to the front end portion thereof.

  Since the inner penetration part 214 and the shield inner penetration part 216 of the refrigerant tank 21 are accommodated in the vacuum tank 22, the connection electrode part 13, the lead part 30, and the shield energization part 40 serving as a heat transfer path are introduced to the inside of the vacuum tank 22. Is done. Thereby, since it becomes easy to ensure the heat transfer path length for reducing heat penetration, the length of the connection electrode and the external terminal portion can be minimized, and the terminal structure 1 can be miniaturized. it can.

  The vacuum chamber 22 is evacuated by a vacuum pump (not shown) during operation and kept in a vacuum state. A space between the heat insulating inner tube 121 and the heat insulating outer tube 122 communicating with the vacuum chamber 22 is maintained in a vacuum state.

  The lead portion 30 is a conductor for drawing a current from the superconducting cable 10, specifically, the terminal structure 1 to the actual system. The lead portion 30 is connected to the connection electrode portion 13 connected to the superconducting conductor layer 112 of the superconducting cable 10, and has an internal intermediate conductor 31, a conductor relay portion 32, an external intermediate conductor 33, and an external terminal portion 34. .

  In the present embodiment, the inner intermediate conductor 31 and the outer intermediate conductor 33 are configured to have flexibility such as a flexible conductor such as a flat knitted copper wire, and the inner intermediate conductor 31 and the outer intermediate conductor 33 are configured. However, it functions as a shrinkage absorbing portion that absorbs heat shrinkage of the refrigerant tank 21 during cooling.

  The external terminal portion 34 and the conductor relay portion 32 are made of, for example, a conductive material, for example, copper. The external terminal portion 34 passes through the vacuum chamber 22 in an airtight manner and is fixed to the vacuum chamber 22. One end 34 a of the external terminal portion 34 is drawn outside and exposed to the outside of the vacuum chamber 22. Further, the other end 34 b of the external terminal portion 34 is electrically connected to the conductor relay portion 32 inside the vacuum chamber 22 via the external intermediate conductor 33. The conductor relay portion 32 passes through the refrigerant tank 21 in an airtight manner and is fixed to the refrigerant tank 21. The conductor relay part 32 is connected to the external intermediate conductor 33 at one end 32 a located outside the refrigerant tank 21, and is connected to the connection electrode part 13 via the internal intermediate conductor 31 at the other end 32 b in the refrigerant tank 21. The Since the inner intermediate conductor 31 is flexible like the outer intermediate conductor 33, it can easily absorb the thermal contraction (particularly the horizontal thermal contraction) of the refrigerant tank 21 during cooling.

  4 and 5 are perspective views showing the main configuration of the connection electrode portion 13 of the terminal structure according to one embodiment of the present invention.

  4 and 5 is electrically connected to the terminal of the superconducting conductor layer 112 (specifically, the superconducting tape 1120) in the refrigerant tank 21.

  The connection electrode portion 13 is electrically connected to a lead portion 30 that is a normal conductive conductor for connecting to a room temperature side device. The connection electrode portion 13 connects the superconducting conductor layer 112 of the superconducting cable 10 and the external terminal portion 34.

  The connection electrode portion 13 is formed of a conductive member such as copper and has an electrode body 132 having a ring-shaped plate shape. The electrode main body 132 is provided with a connecting piece 134 projecting therefrom, and the inner intermediate conductor 31 (see FIG. 3) is connected to the connecting piece 134.

  The superconducting cable 10 in the refrigerant tank 21 is inserted through the central opening that penetrates the electrode main body 132. The electrode body 132 is connected to a plurality of superconducting tapes (tape-shaped superconducting wire) 1120 constituting the superconducting conductor layer 112 which is stripped and exposed on the outer peripheral side. Note that the superconducting tape 1120 connected to the electrode body 132 includes a plurality of superconducting conductors constituting the superconducting conductor layer 112 positioned on the outermost side among the superconducting conductor layers through which the electrode body 132 can be inserted in the cable core 11. A tape 1120 is preferable.

  Here, in the cable core 11, a portion other than the end portions 11201 of the plurality of superconducting tapes 1120 constituting the outermost superconducting conductor layer 112, that is, a portion located on the center side of the outermost superconducting conductor layer 112. Is inserted into the opening of the electrode body 132. Ends 11201 of the plurality of superconducting tapes 1120 constituting the outermost superconducting conductor layer 112 do not pass through the opening of the electrode main body 132, and are on the opposite side in the insertion direction of the front and back surfaces opened in the electrode main body 132. The surface (rear end side surface) 132a is electrically connected via solder. Here, each superconducting tape 1120 is connected to the electrode body 132 (the rear end surface 132a) at equal intervals in the circumferential direction.

  Further, the plurality of superconducting tapes 1120 are connected to the electrode main body 132 in a bent state so as not to contact each other and other members. As a result, even if the superconducting tape 1120 itself contracts during cooling (especially horizontal thermal contraction), it is easily absorbed and the electrode body 132 itself, and thus the other lead portions themselves including the inner intermediate conductor 31 and the inner intermediate conductor 31 themselves. The load will not be applied. Further, the superconducting tape 1120 is raised from the state in which the cable core 11 extending through the electrode main body 132 extends and is connected to the surface 132a on the rear end side of the electrode main body 132. As a result, the flexible superconducting tape 1120 attempts to return to the original position along the extending direction of the cable core 11, so that it is in close contact with the rear end surface 132 a positioned in the returning direction. Contact. Thereby, the superconducting tape 1120 and the electrode main body 132 can be more reliably and stably electrically connected via the solder.

  The shield energization unit 40 shown in FIG. 1 is a conductor for grounding the cable shield layer 114 of the superconducting cable 10. The shield energization part 40 can apply a publicly known composition, such as having a shield lead bar made of a copper bar. Here, the shield energization section 40 is configured in the same manner as the lead section 30, is connected to the shield connection terminal 14 connected to the shield layer 114 of the superconducting cable 10, and is configured in the same manner as the internal intermediate conductor 31. Internal intermediate conductor (not shown), shield relay portion 42 configured similarly to the conductor relay portion 32, external intermediate conductor (not shown) configured similar to the external intermediate conductor 33, and configuration similar to the external terminal portion 34 A shield external terminal portion (not shown). In the shield energization part 40, the shield external terminal part is fixed so as to penetrate the shield outer through part 226 in the vacuum chamber 22 in an airtight manner and be drawn to the outside. The shield external terminal portion is electrically connected to one end of the shield relay portion 42 inside the vacuum chamber 22 through the internal intermediate conductor. The shield relay portion 42 passes through the refrigerant tank 21 in an airtight manner and is fixed to the refrigerant tank 21. Specifically, the shield relay part 42 penetrates the refrigerant tank 21 and is hermetically fixed to the shield inner penetration part 216. The shield relay part 42 is connected to the shield connection terminal 14. The shield energization unit 40 is electrically connected to the cable shield layer 114 of the superconducting cable 10 via the shield connection terminal 14. The inner intermediate conductor and the outer intermediate conductor in the shield energization unit 40 are configured by a flexible conductor (not shown) such as a flat knitted copper wire, for example. Thereby, even if the position of the shield connection terminal 14 moves in the horizontal direction (left and right direction in FIG. 1) due to thermal expansion and contraction of the superconducting cable 10, it can easily follow, so that the shield outer through portion of the vacuum chamber 22 226 etc. can be prevented from being damaged. In this Embodiment, the site | part arrange | positioned in the refrigerant tank 21 in the shield relay part 42 is comprised with the flexible conductor, and it connects to the shield connection terminal 14 via this flexible conductor.

  The support leg portion 28 shown in FIG. 1 supports the vacuum chamber 22 (specifically, the strip tube portion 23) separately from another device, here, the installation surface. Here, the support leg portion 28 is provided so as to protrude downward from the lower surface of the front end side and the rear end side of the vacuum chamber 22, and extends in the horizontal direction along the axial direction of the superconducting cable 10. I support it.

  Since a high voltage is applied to the leg portion 28-1 on the distal end side of the support leg 28 on the distal end side of the vacuum chamber 22, an electric field relaxation portion (insulator) 282 having a plurality of flange portions is provided on the outer surface thereof. It has been.

  FIG. 6 is a diagram showing a connection portion between the cryogenic container 20 and the heat insulating tube 12 of the superconducting cable 10 in the terminal structure 1 according to one embodiment of the present invention.

  As shown in FIG. 6, at the rear end portion of the cryocontainer 20 in the superconducting cable 10, the heat insulating inner pipe 121 passes through the rear end surface 222 of the vacuum chamber 22 and is drawn into at least the vicinity of the rear end surface 212 of the refrigerant chamber 21. Yes.

  The inner flange portion 74 is in contact with the edge portion of the opening 212 a in a state where the central opening corresponds to the opening 212 a of the rear end surface 212 of the refrigerant tank 21. The internal flange portion 74 hermetically connects the rear end surface 212 of the refrigerant tank 21 and the heat insulating inner pipe 121 to the refrigerant tank 21 in the vacuum tank 22 without impairing the sealing performance.

  The internal flange portion 74 is continuously provided at the end portion of the heat insulating inner pipe 121 between the rear end surface 212 of the refrigerant tank 21 and the rear end surface 222 of the vacuum chamber 22. The cable core 11 is inserted into the inner flange portion 74.

  The internal flange portion 74 is disposed so as to surround the outer periphery of the cable core 11. The inner flange portion 74 has an annular surface on one end side (one end portion of the inner flange portion 74) abutting against the rear end surface 212 of the refrigerant tank 21, and the other end of the inner cylinder portion 76 formed on the other end side. The part (rear end part) is connected to one end part (front end part) of the heat insulating inner pipe 121. The inner flange portion 74 is airtightly bonded (welded) to the heat insulating inner tube 121 to the inner tube portion 76, so that no load is applied to the heat insulating inner tube 121. It is fixed so as to protrude to the outer peripheral side. In the internal flange portion 74, an annular surface on one end side (one end portion of the internal flange portion 74) is pressed against the rear end surface 212 of the refrigerant tank 21, and the internal flange portion 74 includes the rear end surface 212 and the internal holding member 50. It is fixed by being pinched by.

  The internal holding member 50 includes a holding portion main body 52 having an engaging portion that engages with the internal flange portion 74, and a fastening portion 54 that fastens and holds the holding portion main body 52 to the rear end surface 212 of the refrigerant tank 21. Have.

  FIG. 7 is a perspective view showing a configuration of a main part of the internal holding member 50 in the terminal structure 1 according to the embodiment of the present invention.

  Here, the holding portion main body 52 has a ring shape that can be engaged with the internal flange portion 74 from the rear end side. When the holding portion main body 52 is disposed on the rear end face side of the inner flange portion 74, the holding portion main body 52 is interposed between the two members before connecting the inner flange portion 74 and the heat insulating inner pipe 121 via the joint portion 90. Let me. Moreover, what comprised the holding | maintenance part main body 52 by the division body divided | segmented into plurality by the surface which passes along an axial center may be sufficient. In this case, after the inner flange portion 74 and the heat insulating inner pipe 121 are assembled, the divided body can be disposed on the rear end face side of the inner flange portion 74.

  The fastening portion 54 is, for example, a bolt and is inserted from the rear end side in the thickness direction at the outer peripheral edge portion of the holding portion main body 52, the head is hooked on the rear end side surface, and protrudes from the front end side surface. The shaft portion to be engaged is screwed into the rear end surface 212 of the refrigerant tank 21. By this fastening part 54, the holding part main body 52 is fastened to the rear end face 212 of the refrigerant tank 21 on the outer peripheral edge side (see FIG. 6). As a result, by tightening the fastening portion (bolt) 54, the holding portion main body 52 is displaced toward the rear end surface 212, and the inner flange portion 74 that engages with the surface 52a on the front end side of the holding portion main body 52 extends over the entire circumference. Are uniformly pressed against the rear end face 212 (see FIGS. 1 and 6). That is, the holding portion main body 52 holds the inner flange portion 74 with the rear end face 212 in a sandwiched state. Further, an airtight member 18 such as a gasket (O-ring) is provided between the inner flange portion 74 and the rear end surface 212, and the inner flange portion 74 sandwiches the airtight member 18 and is more airtight on the rear end surface 212. Fixed.

  As described above, when the internal flange portion 74 is fixed to the refrigerant tank 21 by screwing the fastening portion 54 such as a bolt into the holding portion main body 52, the load at the time of screwing is applied to the holding portion main body 52. Therefore, there is no load (screwing direction (twisting direction) load) when screwing into the internal flange portion 74, and the internal flange portion 74 is substantially on the rear end face 212 side along the axial direction of the superconducting cable 10. Can be translated. Thereby, the internal holding member 50 can be held in a state where the internal flange portion 74 of the internal flange portion 74 (specifically, one end surface of the internal flange portion 74) is pressed against the rear end surface 212 and sandwiched. Therefore, the inner holding member 50 has one end portion (inner flange portion 74) of the inner flange portion 74 whose other end side is connected to the heat insulating inner tube 121 without deforming the inner flange portion 74, that is, the heat insulating inner tube. It can be suitably fixed to the refrigerant tank 21 without applying a load to 121.

  As shown in FIG. 6, the rear end surface 222 of the vacuum chamber 22 and the heat insulating outer tube 122 are connected via an outer flange portion 84.

  The external flange portion 84 is connected at the distal end side of the heat insulating outer tube 122 (here, connected to the distal end portion of the heat insulating outer tube 122), and the cable core 11 and the heat insulating inner tube are disposed inside the heat insulating outer tube 122. 121 is inserted.

  The outer flange portion 84 is configured in the same manner as the inner flange portion 74, and here has an annular plate-like portion and is disposed so as to surround the outer periphery of the cable core 11. The outer flange portion 84 has an annular surface on one end side (one end portion of the inner flange portion 74) abutting on the rear end surface 222 of the vacuum chamber 22 and is formed on the other end portion (rear end portion) side. The portion 82 is continuously formed at one end (tip portion) of the heat insulating outer tube 122. Here, in the outer flange portion 84, the heat insulating outer tube 122 is airtightly joined to the inner peripheral surface of the outer cylindrical portion 82 via a joint portion 90 formed by welding or the like. It should be noted that the outer peripheral surface of the outer cylindrical portion 82 may be airtightly bonded to the heat insulating outer tube 122 via the bonding portion 90. The outer diameter of the outer flange portion 84 (the outer diameter of the annular plate-shaped portion) is larger than the opening 222a of the rear end surface 222 of the vacuum chamber 22, and the front end side surface of the outer peripheral edge of the outer flange portion 84 is the opening 222a. It is located at a position facing the edge. The external flange portion 84 (specifically, the front end side surface of the outer peripheral edge of the external flange portion 84) is pressed against the rear end surface 222 of the vacuum chamber 22 by the external holding member 60 and is sandwiched between the rear end surfaces 222. Is held by.

  The external holding member 60 includes a holding portion main body 62 having an engaging portion that engages with the external flange portion 84 from the other end portion side (rear end surface side) of the external flange portion 84, and the holding portion main body 62 of the vacuum chamber 22. And a fastening portion 64 that fastens and fixes to the rear end face 222.

  For example, the outer holding member 60 has a different outer diameter and inner diameter as compared with the inner holding member 50, and is formed in a ring shape like the inner holding member 50.

  That is, the holding portion main body 62 has a ring shape that can be engaged with the external flange portion 84 from the rear end side.

  The fastening portion 64 is, for example, a bolt, and is inserted from the rear end side in the thickness direction at the outer peripheral edge portion of the holding portion main body 62, the head is hooked on the rear end side surface, and protrudes from the front end side surface. A shaft portion to be engaged with the rear end surface 212 of the vacuum chamber 22 is screwed. By this fastening part 64, the holding part main body 62 is fastened to the edge part of the opening 222 a in the rear end surface 222 of the vacuum chamber 22 on the outer peripheral edge side. That is, when the fastening portion (bolt) 64 is tightened, the holding portion main body 62 is displaced toward the rear end surface 222 side, and the external flange portion 84 engaged therewith is uniformly pressed against the rear end surface 212 over the entire circumference. . An airtight member 18 such as a gasket (O-ring) is provided between the outer flange portion 84 and the rear end surface 222, and the outer flange portion 84 is airtightly fixed to the rear end surface 222 with the airtight member 18 interposed therebetween.

  As described above, when the outer flange portion 84 is fixed to the vacuum chamber 22 by screwing the fastening portion 64 such as a bolt into the holding portion main body 62, the load at the time of screwing is applied to the holding portion main body 62. Therefore, the load (screwing direction (twisting direction) load) when screwing into the external flange portion 84 is not applied, and the external flange portion 84 of the external flange portion 84 is moved rearward along the axial direction of the superconducting cable 10. It can be moved substantially parallel to the end face 222 side. As a result, the outer flange portion 84 of the outer flange portion 84 (specifically, one end surface of the outer flange portion 84) can be pressed against the rear end surface 222 and held. Therefore, the external holding member 60 can suitably fix the external flange portion 84 whose other end side is connected to the heat insulating outer tube 122 to the vacuum chamber 22 without deforming the external flange portion 84.

  In the terminal structure 1, in order to absorb the shrinkage of the refrigerant tank 21 during cooling and the shrinkage of each layer in the cable core 11 of the superconducting cable 10, the inner intermediate conductor 31 and the outer intermediate made of a flexible conductor such as a flat knitted copper wire are used. The conductor 33 or the superconducting tape 1120 is bent and connected to the connection electrode portion 13. Thereby, even if the refrigerant tank 21 and the superconducting cable 10 are thermally contracted during cooling, the lead portion 30 and the like can be prevented from being damaged.

  In addition, in the connection electrode part 13 shown in FIG. 4, it is good also as a structure which provided the pressing part which hold | suppresses the superconducting tape 1120 in the surface 132a of the insertion direction reverse side (rear end side) of the electrode main body 13 to which the superconducting tape 1120 is connected. .

  FIG. 8 is a diagram illustrating a first modification of the connection electrode portion.

  The connection electrode portion 13A shown in FIG. 8 is formed on the surface 132a on the opposite side (rear end side) in the insertion direction of the electrode main body 132 to which the superconducting tape 1120 is connected in the configuration of the connection electrode portion 13 shown in FIGS. A pressing portion 136 is attached so as to cover the surface 132a.

  The holding portion 136 has an annular plate shape having the same outer shape as the electrode body 132 viewed in the axial direction. The pressing portion 136 may be formed of any material, either an insulating material or a conductive material. It is preferable that the rear end surface 132a of the electrode main body 132 and the pressing portion 136 are in close contact with the superconducting tape 1120 by sandwiching solder or the like. According to such a configuration of the connection electrode portion 13A, electrical connection can be made more reliably with a plurality of superconducting tapes 1120 connected at equal intervals in the circumferential direction.

  Further, like the connection electrode portion 13B as the modified example 2 shown in FIG. 9, it is connected to the superconducting conductor layer 112 (specifically, the superconducting tape 1120) of the superconducting cable 10 through the superconducting current lead 137. Also good.

  The connection electrode portion 13B has an annular plate-like electrode main body 132B formed of a conductive member such as copper, and the inner intermediate conductor 31 (see FIG. 3) is connected to a part of the outer periphery of the electrode main body 132B. The connecting piece 134 is projected in the radial direction.

  A plurality of superconducting tapes 1120 are connected to the rear end surface 132Ba of the electrode body 132B via superconducting current leads 137 formed of a superconducting tape (oxide superconducting wire). Note that the superconducting tape in the superconducting current lead 137 may be composed of a superconducting tape similar to the superconducting tape 1120. That is, the superconducting tape of the superconducting current lead 137 has a superconducting thin film formed by a TFA-MOD method on a composite substrate (similar to the composite substrate of the superconducting tape 1120). In this superconducting thin film, oxide particles of 50 nm or less containing at least one of Y, Zr, Sn, Ti, and Ce are dispersed as magnetic flux pinning points. At this time, the superconducting tape 1120 is preferably solder-connected to the superconducting current lead 137 on the surface on the superconducting layer side.

  In the terminal structure 1, according to the structure using the connection electrode portion 13 </ b> B instead of the connection electrode portion 13, the superconducting tape 1120 that constitutes each superconducting conductor layer 112 of the superconducting cable 10 is a superconducting current lead that hardly transmits heat. It is electrically connected to the connection electrode portion 13B via 137. As a result, when heat is transferred from the outside into the refrigerant tank 21, it passes through the superconducting current lead, so that compared to the connection electrode portion 13, it is more difficult for heat to enter.

  Further, like the connection electrode portion 13C as the modification 3 shown in FIG. 10, the superconducting conductor layer 112 (specifically, the superconducting cable 10 is connected via a normal conducting wire (normal conducting tape 138) different from the superconducting tape). You may make it connect with the superconducting tape 1120).

  A connection electrode portion 13C shown in FIG. 10 has an annular plate-like electrode main body 132C formed of a conductive member such as copper, and an inner intermediate conductor 31 (see FIG. 3) is formed on a part of the outer periphery of the electrode main body 132C. ) Are connected to project in the radial direction.

  A plurality of superconducting tapes 1120 each comprising the superconducting conductor layer 112 of the superconducting cable 10 are electrically connected to the rear end surface 132Ca of the electrode main body 132C via normal conductive tapes (normal conductive wires) 138, respectively. Has been. Here, the normal conductive tape 138 may be any wire as long as it is a wire having normal conductivity. For example, a copper tape is used. When the superconducting tape 1120 and the connection electrode portion 13C are electrically connected (for example, by solder connection) via the normal conductive tape 138 such as the copper tape 138, the copper tape (normal conductive tape 138) and the connection electrode portion 13C are connected. Solder having a different melting point may be used as the solder used for connection to the solder and the solder used for connecting the copper tape (normal conductive tape 138) and the superconducting tape 1120. Furthermore, since the superconducting tape 1120 can be bent and connected to the connection electrode portion 13C through the normal conducting wire, the shrinkage of the refrigerant tank 21 during cooling can be absorbed. Further, in the connection electrode portion 13B shown in FIG. 9, the normal conductive tape 138 shown in FIG. 10 may be interposed between the superconductive current lead 137 and the superconductive tape 1120. In this configuration, the superconducting current lead 137, the superconducting tape 1120, and the normal conducting tape 138 are electrically connected by solder. Even in this configuration, it is desirable that the superconducting tape 1120 is solder-connected to the normal conducting tape 138 as a connection target on the surface of the superconducting tape 1120 on the superconducting layer side.

  Further, in the terminal structure 1, instead of the connection electrode portion 13, a connection electrode portion 13D of Modification 4 shown in FIG.

  A connection electrode portion 13D shown in FIG. 11 has an annular plate-like electrode main body 132D formed of a conductive member such as copper, and an inner intermediate conductor 31 (see FIG. 3) is formed on a part of the outer periphery of the electrode main body 132D. ) Are connected to project in the radial direction.

  In addition, an annular plate portion 139 that is formed of a conductive member such as copper and through which the superconducting cable 10 is inserted is disposed in the electrode main body 132D. The electrode body 132D and the annular plate portion 139 are connected via a superconducting current lead 137. In the annular plate portion 139, a plurality of superconducting tapes 1120 constituting the superconducting conductor layer 112 for each layer are provided on one surface (the rear end surface) 139a of the front and back surfaces positioned in the opening direction via solder. Are electrically connected. It is desirable that the superconducting tape 1120 in this configuration is solder-connected on the surface on the superconducting layer side to the annular plate portion 139 as a connection target.

  With this configuration, the annular plate portion 139 to which the plurality of superconducting tapes 1120 are connected and the electrode main body 132 are electrically connected via the superconducting current leads 137 that are difficult to thermally conduct. It is possible to prevent heat from entering the refrigerant tank 21 disposed.

  According to the terminal structure 1 of the superconducting cable of the present embodiment, the superconducting cable 10 including the superconducting conductor layer 112 and the conductor insulating layer (electrical insulating layer) 113 provided on the superconducting conductor layer 112, and the superconducting cable 10. Steps are stripped at the refrigerant tank 21 filled with the refrigerant that cools the terminal part of the conductor, the electric field relaxation part 15 provided in the outer periphery of the conductor insulating layer 113 and disposed in the refrigerant tank 21, and the terminal part of the superconducting cable 10. The lead part 30 electrically connected with the edge part of the superconducting conductor layer 112 exposed by this, and the vacuum tank which accommodates the refrigerant | coolant tank 21 and is made into a vacuum state at the time of an operation are provided.

  Refrigerant tank 21 is formed of an insulating tube, and vacuum tank 22 is an insulator pipe (an insulating tube) disposed on the outer periphery of refrigerant tank 21 at a position corresponding to electric field relaxation unit 15 and coaxially with superconducting cable 10. Part 23). The vacuum chamber 22 may include a conductor penetrating portion (outer penetrating portion 224) that is connected to the distal end side in the axial direction of the garment tube (gait tube portion 23). The lead portion 30 may be airtightly penetrated through the conductor penetration portion (outer penetration portion 224), and the end portion of the lead portion (one end portion 34 a of the external terminal portion 34) may be exposed to the outside of the vacuum chamber 22. . Moreover, you may provide the support leg part (support part) 28 which spaces apart the vacuum chamber 22 which has an insulator tube from the ground, and supports it horizontally. The support leg portion 28 preferably includes an electric field relaxation portion (insulator) 282. By this electric field relaxation part 282, the high voltage applied on the front end side of the vacuum chamber 22 can be relaxed. Further, the insulator tube portion 23 may be made of a polymer insulator tube or a porcelain insulator tube. Further, the superconducting cable 10 is configured in the same manner as the other conductor insulating layer 113-2 and the superconducting conductor layer 112-3, which are configured in the same manner as the conductor insulating layer 113-3, inside the superconducting conductor layer 112-3. Other superconducting conductor layers 112-2 may be concentrically arranged in order. In this case, at the terminal portion of the superconducting cable 10, another electric field relaxation portion 15-2 is provided on the outer periphery of the other conductor insulating layer 113-2, and at the end of the other superconducting conductor layer 112-2, The other lead part 30-2 is electrically connected. In addition, in the vacuum chamber 22, another insulator tube (for example, an insulator tube portion 23-2 for the insulator tube portion 23-3) is provided on the outer periphery of the refrigerant tank 21 with another electric field relaxing portion (for example, the electric field relaxing portion 15). -3 is arranged coaxially with the superconducting cable 10 at a position corresponding to the insulator pipe portion 15-2). In addition, the vacuum chamber 22 is connected to the other end of the other pipe (for example, the end of the superconducting cable 10 at the end of the superconducting cable 10) in the axial direction of the other pipe (for example, the pipe section 23-2). (For example, you may provide the outer side penetration part 224-2 comprised similarly to the outer side penetration part 224-3.). The other lead portion 30 is disposed in an airtight manner in the other conductor penetration portion (outer penetration portion 224-2). In addition, the end portion of the other lead portion 30 is exposed to the outside of the vacuum chamber 22. Another insulator tube portion 23-2 is airtightly connected to the tip end of the conductor penetrating portion 224-3 (the end portion on the tip end side in the terminal portion of the superconducting cable 10).

  Here, in the refrigerant tank 21 arranged along the extending direction of the superconducting cable 10, the cable core 11 is a conductor insulating layer (electrical insulating layer) 113-3 from the rear end side toward the front end side, Superconducting conductor layer 112-3, conductor insulating layer (electrical insulating layer) 113-2, superconducting conductor layer 112-2, conductor insulating layer (electrical insulating layer) 113-1, and superconducting conductor layer 112-1 are stepped off. They are arranged in a straight line. By the conductor insulating layer (electrical insulating layer) 113-3 and the superconducting conductor layer 112-3, an insulating part and a conducting part for drawing out the outermost superconducting conductor layer 112-3 are formed. Subsequently, an insulating portion and a conducting portion for drawing out the superconducting conductor layer 112-2 that is lower than the outermost layer are formed by the conductor insulating layer (electrical insulating layer) 113-2 and the superconducting conductor layer 112-2. Further, the conductor insulating layer (electrical insulating layer) 113-1 and the superconducting conductor layer 112-1 are used to draw out the superconducting conductor layer 112-1 below the superconducting conductor layer 112-2, here the innermost superconducting conductor layer 112-1. An insulating part and a current-carrying part are formed.

  That is, in the terminal structure 1, the electric field relaxation part 15 is provided in the conductor insulating layer (electrical insulating layer) 113 covering the predetermined superconducting conductor layer 112, and surrounds the position corresponding to the stress cone, that is, the periphery of the electric field relaxation part 15. An insulating tube is arranged at a position to constitute an insulating portion. Next, the conductive portion is connected to a predetermined superconducting conductor layer covered with a conductor insulating layer (electrical insulating layer) 113 in a linearly continuous manner in the extending direction of the superconducting cable 10 to this insulating portion. It is composed. Unlike the conventional case, the insulating portion and the current-carrying portion required for one superconducting conductor layer are arranged side by side (substantially horizontal here) along the axial direction of the superconducting cable 10 without being orthogonally arranged. In this state, a plurality of superconducting conductor layers 112-3, 112-2, 112-3 are arranged in a straight line, and currents flowing through the respective superconducting conductor layers 112-3, 112-2, 112-3 are connected. It is drawn out of the terminal structure 1 through the electrode part 13 and the lead part 30.

Therefore, unlike the conventional case, it is not necessary to secure an installation area for the cylindrical portion and the insulating tube above, the cryogenic container can be made smaller, the terminal structure itself can be made compact, and the installation space can be reduced. , Heat penetration can be reduced.
In the terminal structure 1, the conductor (current flowing through the superconducting conductor layer) is drawn from the superconducting cable 10 from above the hollow cryogenic container 20 extending in the horizontal direction. 13, the lead-out direction of the conductor can be freely changed by the position and number of the connecting piece portions 134 formed on the outer periphery of the annular electrode body 132 to which the superconducting tape 1120 is connected. For example, the conductor of the superconducting tape can be drawn out in the horizontal direction, drawn down, or drawn in an oblique direction on the outer peripheral surface of the cryogenic container 20. In that case, it is a matter of course that the positions of the conductor relay portion 32 and the external terminal portion 34 through which the lead portion 30 penetrates are appropriately changed.

In the terminal structure 1 of the present embodiment, the superconducting cable 10 having a plurality of superconducting conductor layers, particularly a three-phase superconducting cable is used. However, the present invention is not limited to this, and a single-phase superconducting cable 10 is used. It is good also as the structure which was.
The superconducting cable 10 may be a three-core one-phase superconducting cable accommodated in the heat insulating tube 12 in a state where three single-core cable cores 11 each having a single superconducting conductor layer are twisted together. Good. In that case, in the terminal of the superconducting cable, the terminal structure of the present embodiment is formed by each of the cable cores 11 for each phase. That is, the respective cable cores 11 are arranged in the cryogenic vessel 20 and the terminal structure 1 is formed for each cable core. Even in this configuration, in the terminal structure as a terminal connection portion of the conventional superconducting cable, in the cryogenic container 20 having the double-pipe structure of the refrigerant tank 21 and the vacuum tank 22 in which the terminal of the cable core is disposed, There is no need to provide a projecting cylindrical portion, insert a conductor lead bar into the cylindrical portion, and provide a cannula above the cylindrical portion. Therefore, as in the present embodiment, the terminal structure of the superconducting cable can be realized by reducing the installation space and reducing the heat penetration as compared with the conventional configuration.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Terminal structure 10 Superconducting cable 11 Cable core 12 Heat insulation pipe 13, 13A, 13B, 13C, 13D Connection electrode part 14 Shield connection terminal 15 Electric field relaxation part 18 Airtight member 20 Low temperature container 21 Refrigerant tank 22 Vacuum tank 23, 23-1 , 23-2, 23-3 Insulation tube portion 28 Support leg portion 30 Lead portion 31 Internal intermediate conductor 32 Conductor relay portion 33 External intermediate conductor 34 External terminal portion 34a One end portion of the external terminal portion (end portion of the lead portion)
40 Shield energizing part 42 Shield relay part 50 Internal holding member 52, 62 Holding part main body 54, 64 Fastening part 60 External holding member 74 Internal flange part 76 Internal cylindrical part 82 External cylindrical part 84 External flange part 111 Central cooling pipe 112, 112-1, 112-2, 112-3 Superconducting conductor layer 113, 113-1, 113-2, 113-3 Electrical insulation layer 114 Cable shield layer 115 Protection layer 121 Heat insulation inner tube 122 Heat insulation outer tube 132, 132B, 132C , 132D Electrode body 132a, 132Ba, 132Ca Rear end face 134 Connection piece 136 Presser 137 Superconducting current lead 138 Normal conductive tape (normal conductive wire)
139 Ring plate portion 212, 222 Rear end face (end face)
222a Opening 232 Insulating cylinder 234 Polymer covering 282 Electric field relaxation part (insulator)
1120 Superconducting tape 11201 End

Claims (7)

A superconducting cable comprising a superconducting conductor layer and a conductor insulating layer provided on the superconducting conductor layer;
A refrigerant tank filled with a refrigerant that cools a terminal portion of the superconducting cable; and
An electric field relaxation portion provided on an outer periphery of the conductor insulating layer and disposed in the refrigerant tank;
A lead portion electrically connected to an end portion of the superconducting conductor layer exposed by being stepped off at a terminal portion of the superconducting cable;
Containing the refrigerant tank, and a vacuum tank whose inside is evacuated during operation;
With
The refrigerant tank is formed of an insulating tube,
The vacuum chamber has a pipe that is disposed coaxially with the superconducting cable at a position corresponding to the electric field relaxation portion on the outer periphery of the refrigerant tank.
Superconducting cable terminal structure. The vacuum chamber includes a conductor penetrating portion connected to the distal end side in the axial direction of the insulator tube,
In the conductor penetrating portion, the lead portion is arranged in an airtight manner,
The end of the lead part is exposed to the outside of the vacuum chamber,
The superconducting cable terminal structure according to claim 1. A support portion for horizontally supporting the vacuum chamber away from the ground;
The terminal structure of the superconducting cable according to claim 1 or 2. The support portion includes a lever;
The terminal structure of the superconducting cable according to claim 3. The insulator tube comprises a hollow polymer insulator tube or a hollow porcelain insulator tube.
The terminal structure of the superconducting cable according to any one of claims 1 to 4. The superconducting cable has concentric circles in order of other conductor insulation layers and other superconducting conductor layers inside the superconducting conductor layer,
In the terminal part of the superconducting cable,
On the outer periphery of the other conductor insulating layer, another electric field relaxation portion is provided,
The other lead portion is electrically connected to the end of the other superconducting conductor layer,
On the outer periphery of the refrigerant tank, another insulator pipe is arranged coaxially with the superconducting cable at a position corresponding to the other electric field relaxation portion,
The vacuum chamber has the insulator tube and the other insulator tube.
The terminal structure of the superconducting cable according to any one of claims 1 to 5. The vacuum chamber includes another conductor penetrating portion connected to the axial front end side of the other insulating tube,
In the other conductor penetrating portion, the other lead portion is arranged so as to penetrate airtightly,
An end of the other lead portion is exposed to the outside of the vacuum chamber,
The other insulator tube is airtightly connected to the tip end side in the axial direction of the conductor penetration portion.
The terminal structure of the superconducting cable according to claim 6.

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