JP6395645B2 - Superconducting cable termination structure - Google Patents

Description

  The present invention relates to a termination structure of a superconducting cable.

  Patent Document 1 discloses a termination structure of a superconducting cable that takes a long current path (current path) by forming a slit in a conductive flange connected to a current lead connected to the end of the superconducting cable. Yes.

US Pat. No. 8,755,853

  However, in the termination structure of the superconducting cable disclosed in Patent Document 1, since a slit is formed in a thick metal conductive flange, it takes time and labor to process the slit.

  In view of the above facts, an object of the present invention is to provide a termination structure of a superconducting cable that can reduce heat penetration with a simple structure.

  The terminal structure of the superconducting cable according to claim 1 is a substantially cylindrical current deriving member connected to the end of the superconducting cable and a conductive plate spaced apart from each other, and the plate surface and the outer periphery of the current deriving member A laminated plate arranged so as to face the surface, a current extraction part arranged around the current deriving member, and the conductive plates are connected to each other, and the conductive plate on the current deriving member side and the current deriving A first connecting member that connects the members; and a second connecting member that connects the conductive plate on the current extraction portion side and the current extraction portion.

In the termination structure of the superconducting cable according to claim 1, the current deriving member and the current leading portion are electrically connected via a laminated plate in which the plate surface is arranged to face the outer peripheral surface of the current deriving member. .
The stacked plate is configured by stacking conductive plates apart from each other. The first connecting member connects the conductive plates to each other and connects the conductive plate on the current deriving member side and the current deriving member. Moreover, the 2nd connection member has connected the electrically-conductive plate by the side of an electric current extraction part, and an electric current extraction part.
Thus, by arranging the laminated plate composed of a plurality of conductive plates between the current deriving member and the current extracting portion, the current path from the current deriving member to the current extracting portion becomes longer and the heat transfer path becomes longer. The temperature gradient becomes longer by applying the current extraction member to the current extraction portion. Thereby, the heat penetration | invasion to the superconducting cable of a low-temperature state can be reduced normally through the electric current derivation member from the electric current extraction part arrange | positioned outside.
Moreover, in the termination | terminus part structure of the said superconducting cable, a laminated plate, a 1st connection member, and a 2nd connection member are compared with the structure which processes a slit in a thick metal member and lengthens a current path and a heat transfer path, for example It is possible to reduce the heat intrusion into the superconducting cable with a simple structure.

  In the terminal structure of the superconducting cable, the resistance of the laminated plate can be set to an appropriate value by changing the thickness and length of the conductive plate even if the current capacity drawn from the current deriving member increases. .

  The termination structure of the superconducting cable according to claim 2 is the termination structure of the superconducting cable according to claim 1, wherein the first connecting member is electrically conductive so that a surface direction of the conductive plate is a current path. The plates are connected together.

  In the termination structure of the superconducting cable according to claim 2, since the first connection member connects the conductive plates so that the surface direction of the conductive plate is a current path, the current path and the heat transfer path are further increased. Since it becomes long, the heat penetration | invasion to the superconducting cable of a low temperature state can be further reduced through an electric current derivation member.

  The termination structure of the superconducting cable according to claim 3 is the termination structure of the superconducting cable according to claim 1, wherein the conductive plate has a connection position with the conductive plate facing one surface and the other. The first connecting member is connected so that the connection position with the conductive plate facing the surface is different.

  In the termination structure of the superconducting cable according to claim 3, the conductive plate is connected to the conductive plate facing one surface by the first connecting member, and the connection position to the conductive plate facing the other surface is the first connection member. Are connected to be different. As described above, since the connection position is different, the current path and the heat transfer path are further lengthened, so that the heat intrusion into the superconducting cable in the low temperature state can be further reduced through the current deriving member.

  The termination structure of the superconducting cable according to claim 4 is the termination structure of the superconducting cable according to any one of claims 1 to 3, wherein an insulating heat insulating member is laminated between the adjacent conductive plates. ing.

  In the termination structure of the superconducting cable according to claim 4, the insulating heat insulating member is stacked between the adjacent conductive plates, that is, the stacked plate is configured by stacking the conductive plates between the insulating heat insulating members. ing. For this reason, heat transfer between adjacent conductive plates can be suppressed.

  The termination structure of the superconducting cable according to claim 5 is the termination structure of the superconducting cable according to any one of claims 1 to 4, wherein the laminated plate is configured such that the conductive plate is detachably laminated. It is configured.

  In the termination structure of the superconducting cable according to the fifth aspect, the laminated plate is formed by detachably laminating the conductive plates in a separated state. For this reason, the number of conductive plates constituting the laminated plate can be changed as necessary. Note that by changing the number of conductive plates constituting the laminated plate, the resistance of the laminated plate can be set to an appropriate value, and the heat transfer path can be lengthened.

  The termination structure of the superconducting cable according to claim 6 is the termination structure of the superconducting cable according to any one of claims 1 to 5, wherein the conductive plate is an arc plate arranged on a concentric circle. These are arranged so as to surround the outer peripheral portion of the current deriving member having a cylindrical shape.

  In the termination structure of the superconducting cable according to the sixth aspect, the laminated plate can be compactly accommodated in a space formed between the current lead-out member and the current lead-out portion.

  The termination structure of the superconducting cable according to claim 7 is the termination structure of the superconducting cable according to any one of claims 1 to 6, wherein the second connection member is a flexible terminal.

  In the termination structure of the superconducting cable according to claim 7, electrical connection can be maintained even if the laminated plate and the current extraction portion are thermally expanded or contracted due to a temperature change.

  As described above, the present invention can provide a termination structure of a superconducting cable that can reduce heat intrusion with a simple structure.

It is a longitudinal cross-sectional view of the termination | terminus part structure of the superconducting cable which concerns on 1st Embodiment of this invention. It is an enlarged view of the part pointed by the arrow 2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is an enlarged cross-sectional view of a portion indicated by an arrow 4 in FIG. 3. It is a cross-sectional view (cross-sectional view corresponding to FIG. 3) of the termination | terminus part structure of the superconducting cable which concerns on 2nd Embodiment of this invention. It is a cross-sectional view (cross-sectional view corresponding to FIG. 3) of the termination | terminus part structure of the superconducting cable which concerns on 3rd Embodiment of this invention.

<First Embodiment>
Hereinafter, the termination structure 20 of the superconducting cable according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the termination structure 20 of the superconducting cable of the first embodiment (hereinafter simply referred to as “termination structure 20”) is a current deriving member connected to the end of the superconducting cable 21. A current lead 24 as an example and a conductive plate 26 (see FIGS. 3 and 4) are laminated between an insulating member 28 (see FIGS. 3 and 4) as an example of an insulating heat insulating member, and a plate surface 30A is a current lead. 24, the laminated plate 30 arranged to face the outer peripheral surface, the conductive flange 32 as an example of the current extraction portion arranged around the current lead 24, and the surface direction of the conductive plate 26 to be a current path. A screw member 34 (see FIGS. 3 and 4) as an example of a first connecting member for connecting the conductive plates 26 to each other and connecting the conductive plate 26 on the current lead 24 side and the current lead 24, Having a flexible terminal 36 as an example of a second connecting member connecting the conductive plate 26 and the conductive flange 32 of the flange 32 side.

  The superconducting cable 21 used in this embodiment is a single-core superconducting cable in which a single cable core 22 is housed in a heat insulating tube 23.

  The cable core 22 can be the same as the cable core used in a known superconducting cable. In this embodiment, the former includes, as an example, a superconducting conductor layer, an electrical insulating layer, a superconducting shield layer, and a normal conducting shield. A cable core formed by sequentially winding a layer, a protective layer, and the like is used.

  As the heat insulation pipe 23, the same heat insulation pipe as that used in a known superconducting cable can be used. In this embodiment, a double pipe including an inner pipe 23A and an outer pipe 23B is used as an example. The inner pipe 23A is a stainless corrugated pipe, and the cable core 22 is accommodated therein and filled with a liquid refrigerant (in this embodiment, liquid nitrogen). The outer tube 23B is a stainless corrugated tube and covers the outer periphery of the inner tube 23A with a gap between the outer tube 23B and the inner tube 23A. A heat insulating material (not shown) is disposed between the inner tube 23A and the outer tube 23B. As this heat insulating material, for example, a laminated body (so-called super insulation) of a PET film and non-woven fabric on which aluminum is deposited can be used. In addition, a space between the inner tube 23A and the outer tube 23B is maintained in a vacuum state with a heat insulating material provided. The outer periphery of the outer tube 23B is covered with a corrosion protection layer such as polyvinyl chloride.

  As shown in FIG. 1, the terminal portion of the superconducting cable 21 is accommodated in the cryogenic container 38 and is electrically connected to the current lead 24 via the movable connection terminal 40.

  As the low temperature container 38, a stainless steel double structure container is used. The cryogenic container 38 includes a refrigerant tank 38A that constitutes the inside of the container, and a vacuum tank 38B that constitutes the outside of the container. The outer tube 23B of the heat insulating tube 23 is joined (for example, welded) to the vacuum chamber 38B. On the other hand, the inner tube 23A of the heat insulating tube 23 is joined (for example, welded) to the refrigerant tank 38A. And the area | region between the refrigerant | coolant tank 38A and the vacuum tank 38B made hollow and the area | region between the inner tube 23A and the outer tube 23B of the heat insulation pipe 23 are each vacuum-sucked, and a vacuum heat insulation layer is formed. Yes. In addition, the internal region of the refrigerant tank 38A communicates with the internal region of the inner tube 23A of the heat insulating tube 23, and these regions are filled with a liquid refrigerant (in this embodiment, liquid nitrogen).

  The cryogenic container 38 has a cylindrical opening 38 </ b> C formed in the upper part. A cylindrical insulator tube 42 is connected to the opening 38C. A cylindrical insulator tube 44 is connected to the upper end portion of the insulator tube 42 with a plate-like conductive flange 32 interposed therebetween. The upper part of the insulator tube 44 is closed by a closing plate 45.

  As shown in FIG. 3, the conductive flange 32 is an annular member formed of a metal material (for example, aluminum or copper), and as described above, the upper end portion of the insulator tube 42 and the lower end portion of the insulator tube 44. The upper end portion of the insulator tube 42 and the lower end portion of the insulator tube 44 are fastened and fixed by a screw member (not shown). In addition, the conductive flange 32 is formed with a terminal connection portion 33 that protrudes radially outward from the outer peripheral portion. A terminal (not shown) on the actual system side such as a substation is screwed to the terminal connection portion 33.

  The current lead 24 is a substantially columnar member made of a metal material (for example, aluminum or copper). The lower end portion is housed in the cryogenic vessel 38 and connected to the movable connection terminal 40, and the upper end portion is an insulator. Housed in tube 44. Further, the current lead 24 is disposed inside the insulator tube 42 and the insulator tube 44 so that the center axis thereof substantially coincides with the center axis of the insulator tube 42 and the insulator tube 44. In the present embodiment, a current lead having a diameter of 80 mm is used as an example. In addition, the substantially columnar shape here includes a regular columnar shape, an elliptical columnar shape, a columnar shape (for example, a cylindrical shape) in which a hole is formed.

  An insulating block body 46 as an example of an insulating member is attached to the lower end portion side of the current lead 24 so as to surround the outer peripheral portion of the current lead 24. The insulating block body 46 has a cylindrical shape, and a lower end portion is supported by an annular pedestal portion 48 formed on the inner side in the radial direction and formed on the back side of the opening 38C of the cryogenic vessel 38, and the pedestal portion 48 It is fixed.

There are liquid nitrogen (LN ₂ ) and nitrogen gas (GN ₂ ) in the respective inner regions of the insulator tubes 42 and 44, and the liquid nitrogen becomes nitrogen gas before reaching the opening 38C. For this reason, the upper part of the insulator tube 42 and the insulator tube 44 correspond to a normal temperature part.

  As shown in FIGS. 2 and 3, the laminated plate 30 is disposed on the upper end portion side of the current lead 24 so that the plate surface 30 </ b> A faces the outer peripheral surface of the current lead 24. Specifically, the laminated plate 30 is disposed so as to surround the outer peripheral portion on the upper end side of the current lead 24. The laminated plate 30 is formed by laminating a conductive plate 26 with a plate-like insulating member 28 interposed therebetween.

  The conductive plate 26 is an arc plate in which a metal material (for example, aluminum or copper) is formed in an arc shape. In the present embodiment, the laminated plate 30 is formed by laminating five conductive plates 26. The conductive plates 26 have the same thickness and length (length along the axial direction of the current lead 24), but the present invention is not limited to this configuration. Hereinafter, the five conductive plates 26 are appropriately referred to as 26A, 26B, 26C, 26D, and 26E in the order of proximity to the current leads 24.

As shown in FIGS. 3 and 4, the screw member 34 mechanically and electrically connects the adjacent conductive plates 26 so that the surface direction of the conductive plates 26 becomes a current path. Specifically, one end portions of the conductive plate 26A and the conductive plate 26B are mechanically and electrically connected using the screw member 34 with the plate-like conductive member 50 sandwiched therebetween. Similarly, the other ends of the conductive plate 26B and the conductive plate 26C are mechanically and electrically connected using the screw member 34 with the conductive member 50 sandwiched therebetween, and the conductive plate 26C and the conductive plate 26D are connected to each other. The screw member 34 is used to mechanically and electrically connect one end portion with the conductive member 50 interposed therebetween, and the other end portions of the conductive plate 26D and the conductive plate 26E are connected to each other. The screw member 34 is used for mechanical and electrical connection in a state of sandwiching.
In other words, the conductive plate 26 (for example, the conductive plate 26B) is connected to the conductive plate 26 (for example, the conductive plate 26A) facing one surface and the conductive plate 26 (for example, the conductive plate 26) facing the other surface. The screw member 34 is connected so that the connection position with the plate 26C) is different.

  Further, the screw member 34 is used to mechanically and electrically connect the other end portion of the conductive plate 26A and the current lead 24 with the conductive member 50 interposed therebetween so that the surface direction of the conductive plate 26A becomes a current path. doing.

The insulating member 28 is disposed between the ends of the conductive plate 26 opposite to the side where the conductive member 50 is disposed. Further, the conductive member 50 has the same thickness as that of the insulating member 28, and keeps the stacking interval of the conductive plates 26 constant. Further, the conductive member 50 electrically connects adjacent conductive plates 26 together with the screw member 34. Therefore, the resistance (R) from the current lead 24 to the conductive flange 32 can be changed by changing the contact area between the conductive member 50 and the conductive plate 26. Further, the resistance (R) can be similarly changed by changing the contact area between the conductive member 50 and the current lead 24.
In the present embodiment, the screw member 34 penetrates the conductive member 50 in the plate thickness direction, and the tip portion thereof is screwed into the insulating member 28.

  The flexible terminal 36 is a flexible terminal and electrically connects the conductive plate 26 </ b> E and the conductive flange 32. Specifically, one end of the flexible terminal 36 is connected to the conductive plate 26 using the screw member 52, and the other end is connected to the inner peripheral portion of the conductive flange 32 using the screw member 53. ing. In the present embodiment, the conductive plate 26 </ b> E and the conductive flange 32 are electrically connected by twelve flexible terminals 36. In addition, this invention is not limited to the said structure. The number of the flexible terminals 36 may be more or less than 12, and some or all of the flexible terminals may have different cross-sectional areas. The resistance (R) from the current lead 24 to the conductive flange 32 can be changed by varying the number of the flexible terminals 36 and the cross-sectional area.

Here, a current path (current path) from the current lead 24 to the conductive flange 32 according to the present embodiment will be described.
As shown in FIG. 3, first, the current from the current lead 24 flows through the conductive member 50 and the screw member 34 to the other end of the conductive plate 26A. This current flows along the surface direction of the conductive plate 26A from the other end of the conductive plate 26A toward the one end (current flows counterclockwise in FIG. 3). Next, the current flows from one end of the conductive plate 26A to one end of the conductive plate 26B through the conductive member 50 and the screw member 34, and then flows along the surface direction of the conductive plate 26B (clockwise in FIG. 3). Current will flow through.) Similarly, the current flows from the other end of the conductive plate 26B to the other end of the conductive plate 26C through the conductive member 50 and the screw member 34, and then flows along the surface direction of the conductive plate 26C (in FIG. 3). Current flows counterclockwise.), Flows from one end of the conductive plate 26C to one end of the conductive plate 26D through the conductive member 50 and the screw member 34, and then flows along the surface direction of the conductive plate 26D (FIG. 3, the current flows clockwise), and flows through the conductive member 50 and the screw member 34 from the other end of the conductive plate 26D to the other end of the conductive plate 26E.

  Then, the current that flows through the conductive plate 26 </ b> E flows through the flexible terminal 36 to the conductive flange 32. The current flowing through the conductive flange 32 can flow to the actual system side through the terminal attached to the terminal connection portion 33.

Next, the operation and effect of the termination structure 20 of this embodiment will be described.
In the termination structure 20, the current lead 24 and the conductive flange 32 are electrically connected via the laminated plate 30. The laminated plate 30 is configured by laminating five conductive plates 26 with an insulating member 28 interposed therebetween, and is electrically conductive so that the surface direction of the conductive plate 26 becomes a current path by the screw member 34 and the conductive member 50. The plates 26 are connected to each other, and the conductive plate 26 (conductive plate 26A) on the current lead 24 side and the current lead 24 are connected. Further, the conductive plate 26 (conductive plate 26 </ b> E) on the conductive flange 32 side and the conductive flange 32 are connected by the flexible terminal 36.
Thus, by making the surface direction of the conductive plate 26 the current path, the current path becomes longer and the heat transfer path becomes longer, and a temperature gradient can be created from the current lead 24 to the conductive flange 32. Thereby, the heat penetration | invasion to the superconducting cable 21 of a low temperature state from the electrically conductive flange 32 arrange | positioned outside can be reduced through the current lead 24.

  Moreover, in the termination | terminus part structure 20, compared with the structure which processes a slit in a thick metal member and lengthens an electric current path and a heat transfer path | route, it is easy to use the laminated plate 30, the screw member 34, and the flexible terminal 36, for example. With this structure, heat intrusion into the superconducting cable 21 can be reduced.

  Further, in the termination structure 20, for example, the laminated plate 30 is disposed to face the outer peripheral surface of the current lead 24 as compared with a configuration in which the current lead itself is lengthened to create a temperature gradient, so that the current lead 24 is excessive. There is no need to make it long. Thereby, the enlargement of the termination | terminus part structure 20 can be suppressed, and installation of the cryogenic container 38 does not become unstable. Further, an increase in cost can be suppressed.

  In the termination structure 20, even if the current capacity drawn from the current lead 24 increases, the resistance (R) of the laminated plate 30 can be set to an appropriate value by changing the thickness and length of the conductive plate 26. Can do.

  In the terminal portion structure 20, the conductive plate 26 is laminated with the insulating member 28 interposed therebetween to constitute the laminated plate 30, so that heat transfer between the adjacent conductive plates 26 can be suppressed.

  Moreover, in the termination | terminus part structure 20, the laminated plate 30 can be stored compactly in the space formed between the electric current lead 24 and the conductive flange 32 by making the electrically conductive plate 26 into an arc plate.

Furthermore, since the terminal structure 20 uses the flexible flexible terminal 36, even if the laminated plate 30 and the conductive flange 32 are thermally expanded or contracted due to a temperature change, the laminated plate 30 and the conductive flange 32 are You can maintain the electrical connection between.
Furthermore, since the terminal structure 20 can change the resistance (R) by changing the number of the flexible terminals 36, the resistance (R) can be set to an appropriate value according to the specification. A plurality of screw holes used for connecting the flexible terminals 36 are provided in the conductive plate 26E in advance so that the number of the flexible terminals 36 can be changed, and the screw holes used for connecting the flexible terminals 36 to the conductive flange 32 are provided. It is desirable to provide a plurality of these in advance.

  Furthermore, in the termination | terminus part structure 20, the adjacent conductive plates 26 are electrically and mechanically connected by the screw member 34. FIG. For this reason, the number of conductive plates 26 constituting the laminated plate 30 can be changed as necessary. Note that by changing the number of conductive plates 26 constituting the laminated plate 30, the resistance of the laminated plate 30 can be set to an appropriate value, and the heat transfer path can be lengthened.

  In the termination structure 20 of the present embodiment, the thickness and length of the five conductive plates 26 are all the same, but the present invention is not limited to this configuration. For example, when the plate thickness of the conductive plate 26 on the conductive flange 32 side is thicker than the conductive plate 26 on the current lead 24 side, the resistance (R) from the current lead 24 to the conductive flange 32 is easily set to an appropriate value. The effect is obtained. When the conductive plate 26 on the conductive flange 32 side is made longer than the conductive plate 26 on the current lead 24 side, the resistance from the current lead 24 to the conductive flange 32 is the same as when the plate thickness is increased. The effect that it becomes easy to make (R) into an appropriate value is acquired. In addition, you may apply the said structure to 2nd Embodiment and 3rd Embodiment which are mentioned later.

  Furthermore, in the termination | terminus part structure 20 of this embodiment, although the edge part of the one side of the adjacent conductive plate 26 is electrically connected by the screw member 34 and the electrically-conductive member 50, this invention is not limited to this structure. For example, a part of the insulating members 28 may be replaced with the conductive members 50. As described above, when some of the insulating members 28 are changed to the conductive members 50, the current path is changed. As a result, not only the resistance (R) but also the inductance (L) can be changed. In addition, you may apply the said structure to 2nd Embodiment and 3rd Embodiment which are mentioned later.

  Moreover, in the termination | terminus part structure 20 of this embodiment, although the adjacent conductive plates 26 are electrically and mechanically connected by the screw member 34, this invention is not limited to this structure. For example, the conductive plates 26 may be mechanically connected with an insulating component, and the conductive plates 26 may be electrically connected with a conductive component such as a terminal. In addition, you may apply the said structure to 2nd Embodiment and 3rd Embodiment which are mentioned later.

Second Embodiment
Next, a termination structure 60 (hereinafter, simply referred to as “termination structure 60”) of the superconducting cable according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 5, the termination structure 60 of this embodiment has the same configuration as that of the first embodiment except for the configuration of the laminated plate 62.

  The laminated plates 62 are arranged on both sides of the current lead 24 so that the plate surface 62 </ b> A faces the outer peripheral surface of the current lead 24 on the upper end side of the current lead 24. Specifically, the laminated plates 62 on both sides are arranged so as to surround the outer peripheral portion on the upper end side of the current lead 24. The laminated plate 62 is formed by laminating a conductive plate 64 with a plate-like insulating member 28 interposed therebetween.

  The conductive plate 64 is an arc plate in which a metal material (for example, aluminum or copper) is formed in an arc shape. In the present embodiment, the laminated plate 62 is formed by laminating five conductive plates 64. Hereinafter, the five conductive plates 64 are appropriately referred to as 64A, 64B, 64C, 64D, and 64E in the order of proximity to the current lead 24. The arrangement of the insulating member 28 and the conductive member 50 and the mechanical and electrical connection between the conductive plates 64 by the screw member 34 are the same as those of the laminated plate 30 of the first embodiment.

  Next, the operation and effect of the termination structure 60 of this embodiment will be described. In addition, description is abbreviate | omitted about the effect | action and effect obtained by the structure similar to the termination | terminus part structure 60 which concerns on 1st Embodiment.

  In the termination structure 60, the laminated plates 62 are arranged on both sides of the current lead 24. Therefore, the resistance (by changing the thickness and length of the conductive plate 64 constituting the laminated plate 62 on one side is changed. R) can be made appropriate. Further, since the laminated plate 62 is disposed on both sides of the current lead 24, for example, the upper end portion of the current lead 24 is inserted into the current lead 24 as in the laminated plate 30 of the first embodiment. Compared to the configuration arranged around, the stacking plate mounting work (mechanical connection work) is simplified.

<Third Embodiment>
Next, a termination structure 70 (hereinafter simply referred to as “termination structure 70”) of the superconducting cable according to the third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure similar to 1st Embodiment, and description is abbreviate | omitted suitably.

  As shown in FIG. 6, the termination structure 70 of the present embodiment uses the same configuration as that of the first embodiment except for the configuration of the laminated plate 72.

  A plurality of (four in this embodiment) laminated plates 72 are arranged on the outer periphery of the current lead 24 so that the plate surface 72A faces the outer peripheral surface of the current lead 24 on the upper end side of the current lead 24. Specifically, the plurality of laminated plates 72 are disposed so as to surround the outer peripheral portion on the upper end side of the current lead 24. The laminated plate 72 is formed by laminating a conductive plate 74 with a plate-like insulating member 28 interposed therebetween.

  The conductive plate 74 is a plate in which a metal material (for example, aluminum or copper) is formed in a flat plate shape. In this embodiment, the laminated plate 72 is formed by laminating four conductive plates 74. In the following, the four conductive plates 74 are appropriately referred to as 74A, 74B, 74C, and 74D in order of proximity to the current lead 24. The arrangement of the insulating member 28 and the conductive member 50 and the mechanical and electrical connection between the conductive plates 74 by the screw member 34 are the same as those of the laminated plate 30 of the first embodiment. In the present embodiment, a part of the conductive plate 74A is bent so as to be stepped.

  Next, the operation and effect of the termination structure 70 of this embodiment will be described. In addition, description is abbreviate | omitted about the effect | action and effect obtained by the structure similar to the termination | terminus part structure 70 which concerns on 1st Embodiment.

  In the termination structure 70, a plurality of flat conductive plates 74 are stacked to form a stacked plate 72. For example, the conductive plate 26 is formed in an arc shape like the stacked plate 30 of the first embodiment. In comparison, the processing of the conductive plate is simple, and an increase in cost can be suppressed. Further, in the termination structure 70, similarly to the termination structure 60 of the second embodiment, the resistance (R) is appropriately adjusted by changing the plate thickness and length of the conductive plate 74 constituting a part of the laminated plates 72. And the attachment work (mechanical connection work) of the laminated plate 72 is simplified.

  In the first embodiment, the current is drawn from the superconducting cable 21 by one current lead 24, but the present invention is not limited to this configuration. For example, a configuration may be adopted in which current is drawn from the superconducting cable 21 by a plurality of current leads 24. In this case, by making the resistance (R) of the laminated plate 30 connected to each current lead 24 different, or changing the number of flexible terminals 36, the current flowing through each current lead 24 is made to be uniform. Or can be biased. In addition, you may apply the said structure to 2nd Embodiment and 3rd Embodiment.

  In the first embodiment, the laminated plate 30 is configured by laminating a plurality of conductive plates 26 with the insulating member 28 interposed therebetween, but the present invention is not limited to this configuration. For example, the laminated plate 30 may be configured by laminating a plurality of conductive plates 26 separated from each other, that is, with an air layer disposed between adjacent conductive plates 26. In addition, you may apply the said structure to 2nd Embodiment and 3rd Embodiment.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

20, 60, 70 Terminal structure 21 Superconducting cable 24 Current lead (current deriving member)
26, 64, 74 Conductive plate 28 Insulating member (insulating heat insulating member)
30, 62, 72 Laminated plates 30A, 62A, 72A Plate surface 32 Conductive flange (current extraction part)
34 Screw member (first connecting member)
36 Flexible terminal (second connecting member)

Claims (7)

A substantially cylindrical current deriving member connected to the end of the superconducting cable;
A laminated plate in which the conductive plates are spaced apart and laminated so that the plate surface and the outer peripheral surface of the current deriving member face each other;
A current extraction portion disposed around the current deriving member;
Connecting the conductive plates to each other, and a first connecting member for connecting the conductive plate on the current deriving member side and the current deriving member;
A second connecting member that connects the conductive plate on the side of the current extraction unit and the current extraction unit;
A terminal structure of a superconducting cable.   2. The superconducting cable termination structure according to claim 1, wherein the first connection members connect the conductive plates to each other so that a surface direction of the conductive plates is a current path.   The conductive plate is connected by the first connection member so that a connection position with the conductive plate facing one surface and a connection position with the conductive plate facing the other surface are different. Item 2. The superconducting cable termination structure according to Item 1.   The termination | terminus part structure of the superconducting cable of any one of Claims 1-3 by which the insulation heat insulation member is laminated | stacked between the said adjacent conductive plates.   The termination structure of the superconducting cable according to any one of claims 1 to 4, wherein the laminated plate is configured by stacking the conductive plates in a detachable manner.   The said conductive plate is a circular arc plate arrange | positioned on a concentric circle, and is arrange | positioned so that the outer peripheral part of the said current derivation member made into the column shape may be surrounded. Superconducting cable termination structure.   The terminal structure of a superconducting cable according to any one of claims 1 to 6, wherein the second connection member is a flexible terminal.

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