JP3630968B2 - Oxide superconducting cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oxide superconducting cable having improved mechanical strength and reduced AC loss.
[0002]
[Prior art]
Conventionally, as an example of an oxide superconducting cable, an oxide superconducting cable 1 in which a superconducting conductor 3 is spirally wound around a pipe-shaped former 2 made of copper or the like is known as shown in FIG. It has been.
As shown in FIG. 7A, the superconducting conductor 3 is formed by covering a core 4 which is an aggregate of a plurality of superconducting cores 6 with a sheath 7 made of silver or the like. A superconducting laminate 8 shown in FIG. 6A is formed by winding a plurality of layers around the former 2.
[0003]
Examples of the oxide superconducting material used for the superconducting core 4 include Bi ₂ Sr ₂ Ca ₁ Cu ₂ O _x (Bi-based 2212 phase), Bi ₂ Sr ₂ Ca ₂ Cu ₃ O _y (Bi-based 2223 phase),
Those having a composition such as Bi _1.6 Pb _0.4 Sr ₂ Ca ₂ Cu ₃ O _x , Tl ₂ Ba ₂ Ca ₂ Cu ₃ O _y are used. Among them, Bi-based, particularly Bi-based 2223 phase oxide superconducting materials are widely applied to the superconducting core 4 as a stable material having a high critical temperature.
Next, as another structural example of the oxide superconducting cable, as shown in FIG. 6 (b), the superconducting wire is plastically processed into segments, and the segmented superconducting conductor 6 is wound around the former 2. A superconducting cable 7 configured as described above is known.
[0004]
In any of the conventional superconducting cables 1 and 7 shown in FIGS. 6 (a) and 6 (b), it is considered preferable to adopt an insulating structure in order to reduce loss during AC energization. In the superconducting cables 1 and 7, interlayer insulation is applied to the spiral superconducting conductor 3 or interlayer insulation is applied to the segmented superconducting conductor 6 to reduce AC loss as a superconducting cable. . Conventionally, in order to perform this interlayer insulation, an insulating paper or polyimide tape is wound around the outer surface of the superconducting conductors 3 and 6 and then wound around the former 2.
[0005]
[Problems to be solved by the invention]
However, if the insulation between the superconducting conductors is made by paper insulation or polyimide tape insulation, the force acting in the longitudinal direction of the cable when the superconducting conductor is wound around the former 2, for example, the stress due to the winding force And the like are directly loaded onto the superconductors 3 and 6 themselves. In this case, since the mechanical tensile strain acts on the superconductors 3 and 6, for example, the load of a tensile stress of about 30 MPa reduces the critical current density of the superconductor to about 80% before the load. It had the problem of end.
[0006]
Further, in the oxide superconducting cable 1 as described above, when an alternating current is passed through the superconducting conductor 3, the influence of the self-magnetic field due to the alternating current flowing in the direction perpendicular to the paper surface in FIG. As a result, an eddy current F is generated. At this time, since the sheath 5 is made of Ag having a low electrical resistivity (Ag is an electrical resistivity of 1.63 μΩcm at 20 ° C.) or the like, as shown in FIG. 7C, the eddy current F1 is adjacent to the superconducting conductor. 3 has a problem of conducting to the sheath 5. As a result, as shown in FIG. 8, since the eddy current F2 is conducted across the entire superconducting laminate 8, the eddy current F2 becomes dominant as a whole of the oxide superconducting cable 1, and the AC loss increases. There was a problem.
[0007]
The present invention has been made in view of the above circumstances, and is capable of being strong against stress by increasing mechanical strength and preventing deterioration of superconducting characteristics, and reducing eddy current loss during AC energization to reduce AC loss. An object of the present invention is to provide an oxide superconducting cable that can reduce the number of wires.
[0008]
[Means for Solving the Problems]
In the oxide superconducting wire according to the present invention, a plurality of composite superconducting conductors formed by attaching a metal tape to a tape-shaped superconducting conductor formed by arranging a plurality of oxide superconducting cores inside a metal sheath, A dislocation superconducting tape unit is configured by twisting dislocations, and a plurality of the dislocation superconducting tape units are wound around a pipe-shaped former,
The dislocation superconducting tape unit includes a plurality of the composite superconducting conductors arranged side by side in two rows and stacked in the thickness direction, and the plurality of composite superconducting conductors are disposed in the length direction of the dislocation superconducting tape unit. When the plurality of composite superconducting conductors arranged in two rows are stacked in the thickness direction so as to repeat the case of being located on the front side and the case of being located on the bottom side, the plurality of composite superconducting conductors are The plurality of composites positioned at both ends in the width direction of the dislocation superconducting tape unit by switching within the width of the composite superconducting conductors arranged in two rows between the left and right rows and the upper and lower layers in the middle of their length direction It is arranged and arranged so that the ends of the superconducting conductor are aligned between the upper and lower layers,
Each of the dislocation superconducting tape units is wound in a state where a plurality of dislocation superconducting tape units are in contact with widthwise ends of the dislocation superconducting tape unit on the outer periphery of the former,
It said metal tape is formed of a metallic material having a high strength at high electrical resistivity than the metal sheath, characterized in Rukoto.
The superconducting core of the oxide superconducting conductor is composed of Bi ₂ Sr ₂ Ca ₁ Cu ₂ O _x (Bi 2212 phase), Bi ₂ Sr ₂ Ca ₂ Cu ₃ O _y (Bi 2223 phase), Bi _1.6 Pb _0.4 Sr _2. It is assumed to have a composition represented by Ca ₂ Cu ₃ O _x , Tl ₂ Ba ₂ Ca ₂ Cu ₃ O _y , etc., and in particular, a Bi-based oxide superconducting material of Bi-based 2223 phase or Bi-based 2212 phase is selected. It is preferable.
The metal sheath is preferably a noble metal such as Ag, Pt, or Au.
[0009]
Next, in the present invention, the metal tape, are arranged in a stacking direction above the front Symbol dislocation superconducting tape unit thickness direction layered tape-like superconducting conductor in the configuration are preferred.
The metal tape is preferably made of a heat resistant high strength Ni alloy such as Hastelloy. In the case of Hastelloy, the resistance value between adjacent sheaths can be set to 5.9 Ωcm ² through Hastelloy, and for example, the resistance can be increased to about 10,000 times higher than when Ag sheaths are brought into direct contact with each other. Eddy current can be suppressed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a superconducting cable and a method for manufacturing the same according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the superconducting cable of the present invention. The superconducting cable 10 of this form is one in which a dislocation superconducting tape unit 15 is spirally wound around a pipe-shaped former (tubing body) 17.
[0011]
As shown in FIGS. 2 and 3, the dislocation superconducting tape unit 15 is a long belt-shaped unit formed by twisting a plurality of (5 in the drawing) dislocation twists of a tape-shaped composite superconducting conductor (composite superconducting tape) 18. It is. The dislocation superconducting tape unit 15 in this form is configured such that when a plurality of composite superconducting conductors 18 formed by attaching a metal tape 20 of the same width to a tape-like superconducting conductor 19 are assembled and twisted together, each tape-like composite As shown in FIGS. 2 and 3, the superconducting conductor 18 is twisted so that the position of the superconducting conductor 18 is sequentially changed as shown in FIGS. That is, the composite superconducting conductor 18 is arranged so that the case where it is located on the surface side of the dislocation superconducting tape unit 15 and the case where it is located on the bottom side are alternately repeated in the length direction.
In addition, as shown in FIGS. 2 and 3, the dislocation superconducting tape unit 15 includes the plurality of composite superconducting conductors 18 when the plurality of composite superconducting conductors 18 arranged in two rows are stacked in the thickness direction thereof. Are replaced at the both ends of the dislocation superconducting tape unit 15 in the width direction of the dislocation superconducting tape unit 15 by exchanging them within the width of the composite superconducting conductors arranged in two rows between the left and right rows and the upper and lower layers. 1 are arranged so that the end portions of the composite superconducting conductors 18 are aligned between the upper and lower layers, and a plurality of dislocation superconducting tape units 15 are arranged on the outer periphery of the former 17 as shown in FIG. The unit 15 is wound while the end portions in the width direction are in contact with each other.
The winding direction of such a dislocation superconducting tape unit 15 is the direction of S winding (right winding) or Z winding (left winding).
The former 17 is made of a metal material such as stainless steel or copper pipe. The surface of the former 17 is subjected to an insulation treatment in order to suppress energization between the former 17 and the dislocation superconducting tape unit 15.
[0012]
The tape-shaped superconducting conductor 18 is obtained by plastically processing a superconducting multi-core strand (superconducting strand) 25 having a structure shown in FIG. 4 into a rectangular shape and flattening it into a tape shape. A twisted superconducting element wire obtained by twisting the superconducting multi-core element wire 25 may be flattened. The superconducting conductor 18 has a width of about 1.0 mm to 5.0 mm and a thickness of about 0.1 mm to 1.0 mm. In FIG. 4, the direction of the arrow indicates an example of the twisting direction when the superconducting multi-core strand 25 is twisted.
The superconducting multi-core wire 25 includes a core portion 28 made of a superconductor such as a superconducting filament or a core portion 28 made of a material that becomes a superconductor by heat treatment provided inside a metal sheath 29 made of a sheath material. It is.
[0013]
As a superconductor of the core portion 28 or a material that becomes a superconductor by heat treatment,
Bi ₂ Sr ₂ Ca ₁ Cu ₂ O _x (Bi 2212 phase),
Bi ₂ Sr ₂ Ca ₂ Cu ₃ O _y (Bi2223 phase),
A material having a composition represented by Bi _1.6 Pb _0.4 Sr ₂ Ca ₂ Cu ₃ O _x , Tl ₂ Ba ₂ Ca ₂ Cu ₃ O _y or the like is used. For example, a Bi-based oxide of a Bi-based 2223 phase A superconducting material is used.
As a material constituting the metal sheath 29, a material made of a noble metal such as Ag, Pt, Au or an alloy thereof is used.
Therefore, the superconducting conductor 19 composed of such a superconducting multi-core wire 25 has a structure in which a plurality of superconducting filaments 21 are dispersed inside a base made of a noble metal such as Ag, Pt, Au, or an alloy thereof. Yes.
Outside the oxide superconducting cable 10 having such a configuration, a semiconductor layer, an insulating layer, a protective layer, a heat insulating layer, an anticorrosive layer, etc. (not shown) are formed as necessary, and used as a practical superconducting cable. .
[0014]
The metal tape 20 is preferably heat-resistant, and has a higher strength and higher heat resistance than the sheath material constituting the base 29. Specifically, those related to Hastelloy (patented by Haynes Stellite, USA) are preferred, and examples of compositions include Hastelloy A (Ni 58%, Mo 20%, Mn 2%), Hastelloy C (Mo 15 to 17%, W 3 to 5%, Cr 14 to 16.5%, Co 2.5%, Si and Mn 1%, balance Ni), Hastelloy D (Ni 85%, Si 10%, Al 2%), Hastelloy B (Mo 26-30%, Fe 4-7%, Co 2.5%, Cr 1%, Si 1%, C 0.05%, balance Ni), Hastelloy X (Cr 20-23%, Mo 8-10%, Fe 17-20%, Co 0.5-2.5%, Si and Mn 1%)) The composition can be exemplified.
[0015]
Next, an example of the manufacturing method of the superconducting cable 10 of the embodiment shown in FIG.
[Raw material processing process]
A raw material powder of an oxide superconducting material, for example, Bi ₂ O ₃ , PbO, SrCO ₃ , CaCO ₃ , CuO, is used, and a mixing ratio of Bi: Pb: Sr: Ca: Cu is 1.8: 0.4: It mixes so that it may become 2.2: 3.0, The heat processing (calcination) performed on the temperature conditions of the range of 750 to 820 degreeC and the grinding | pulverization after this calcination are repeated several times.
Here, the raw material powder to be mixed may be any of oxides and carbonates of each element of Bi, Pb, Sr, Ca, and Cu in addition to the above.
[Filling process]
The pulverized raw material powder is formed into, for example, a cylindrical body by CIP (cold isostatic pressing) molding or the like, and then the cylindrical body is filled and sealed inside a first pipe made of a sheath material such as Ag. (Ag sheath composite) is formed.
[0016]
[Single wire drawing (drawing) process]
The sheath material composite (Ag sheath composite) is drawn to a predetermined wire diameter with a die or the like to form a superconducting single core wire (single core wire).
[Multi-center process]
After disposing a rod made of Ag or the like inside a second pipe made of a sheath material such as Ag and arranging a predetermined number (for example, 6) of the single core wires around the rod, sealing, Drawing to a predetermined wire diameter with a die, etc.
A superconducting multi-core strand (superconducting strand) 25 as shown in FIG. 4 is formed.
[0017]
[Rolling heat treatment repeat process]
The superconducting element wire 25 is rolled and flattened to a predetermined thickness by a rolling process such as roll rolling. As an apparatus used for the rolling process here, for example, a double rolling mill having a pair of upper and lower rolls, a delivery drum for feeding the superconducting element wire 25 between the rolls, and a superconducting element wire 25 rolled between the rolls. A rolling device (not shown) composed of a conveying machine composed of a take-up drum for winding up is preferably used. In order to roll the superconducting element wire 25 using such a rolling device, the superconducting element wire 25 is fed between the rolls from the delivery drum and rolled, and the rolled superconducting element wire 25 is taken up by a take-up drum. Is done.
Subsequently, the flattened superconducting element wire 25 is housed in an electric furnace or the like, for example, wound around a heat treatment drum, the temperature condition is set to a range of 820 ° C. to 850 ° C., and the treatment time is set to 10 hours to 200 hours. Heat treatment is performed at a range.
Furthermore, the rolling process (or press process) and the heat treatment are repeated a plurality of times to form a tape-shaped superconducting conductor 19 having a predetermined thickness.
[0018]
[Dislocation twisting process]
A metal tape 20 such as a high-strength and high heat-resistant Ni alloy such as Hastelloy tape is attached to one surface of the tape-shaped superconducting conductor 19 and supplied as a composite superconducting conductor 18 to a plurality of dislocation twisting machines.
A dislocation superconducting tape unit 15 as shown in FIGS. 2 and 3 is formed by twisting a plurality of the tape-shaped composite superconducting conductors 18 (five in the drawing) at a predetermined dislocation pitch using a dislocation twisting machine. To do. The dislocation pitch here is in the range of about 20 mm to 500 mm.
[Winding process]
FIG. 1 shows a plurality of sets (for example, 24 sets) of dislocation superconducting tape units 15 wound around a former 17 whose surface is subjected to an insulation treatment with a Z or S winding at a predetermined spiral pitch. Such a superconducting cable 10 is obtained. The spiral pitch here is in the range of about 100 to 200 mm.
[0019]
In the superconducting cable 10 of the present invention, the use of the dislocation superconducting tape unit 15 in which a plurality of tape-like composite superconducting conductors 18 obtained by flattening the twisted superconducting wires 26 are twisted together to form an inner layer side and an outer layer side. The interlayer current gradient can be suppressed. That is, when the superconducting conductor 19 is wound around the outer periphery of the former 2 as it is, a large amount of current flows through the superconducting conductor 19 on the outermost layer of the cable due to the influence of the self-magnetic field, and the current that actually flows toward the inner layer side of the cable. Since there is a tendency to generate an interlayer current gradient that decreases, the critical current density decreases, so that a single superconducting conductor 19 moves back and forth between the inner layer side and the outer layer side by twisting dislocations. Can be suppressed. Thereby, the drift at the time of alternating current supply can be prevented, and deterioration of critical current density can be prevented.
[0020]
Next, in the superconducting cable 10 of the present invention, a number of superconducting conductors 19 reinforced with Hastelloy metal tape 20 are wound around the outer periphery of the former 17, so that even if tensile stress or the like acts on the superconducting cable 10. Since this tensile stress is borne by the metal tape 20, there is less risk of distortion acting on the superconducting conductor 19, and superconducting characteristics such as a decrease in critical current density are less likely to occur.
[0021]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited only to this Example.
Bi ₂ O ₃ , PbO, SrCO ₃ , CaCO ₃ , CuO are mixed so that the mixing ratio of Bi: Pb: Sr: Ca: Cu is 1.8: 0.4: 2.2: 3.0, A heat treatment (calcination) performed under a temperature condition of 800 ° C. and pulverization after the calcination were repeated a plurality of times to obtain a raw material powder.
This raw material powder was formed into a cylindrical shape by CIP (cold isostatic pressing), filled and sealed inside an Ag pipe (first pipe) having an outer diameter of 40 mm and an inner diameter of 20 mm, and an Ag sheath composite was obtained. This Ag sheath composite was drawn to a wire diameter of 3.0 mm with a die or the like to form a single core wire. Next, an Ag rod having a diameter of 3.5 mm is arranged inside an Ag pipe (second pipe) having an outer diameter of 15 mm and an inner diameter of 10 mm, and six single-core wires are arranged around the Ag rod, and sealed. Then, the wire was drawn to a diameter of 0.9 mm with a die or the like to form a superconducting multi-core wire.
[0022]
This superconducting multi-core wire was twisted at a twist pitch of 50 cm to form a twisted superconducting wire. Next, the twisted superconducting wire was rolled to a thickness of 0.30 mm using the above-described rolling apparatus including the double rolling mill and the transfer machine, and was flattened.
Further, the rolling process (or press process) and the heat treatment were repeated a plurality of times to form a tape-shaped superconducting wire having a width of 1 mm and a thickness of 0.20 mm and a rectangular cross-sectional shape.
A 1 mm wide and 0.05 mm thick Hastelloy C tape was added to the surface of the formed tape-shaped superconducting wire to form a composite superconducting conductor, which was then sent to a dislocation twisting machine.
[0023]
A dislocation superconducting tape unit was obtained by using a dislocation twisting machine to dispose and twist five of the tape-shaped composite superconducting conductors at a transition pitch of 80 mm.
The dislocation superconducting tape unit obtained in this manner was applied to a stainless steel corrugated tube (tube) having an outer diameter of 25 mm and a length of 2 m, which had been insulated by applying Kapton tape on the surface, at a pitch of 50 cm ( 24 sets) A spiral shape (4 rolls) was wound to obtain an oxide superconducting cable.
[0024]
(Comparative example)
A superconducting conductor was formed in the same manner as in the above example, and a polyimide tape was wrapped around the superconducting conductor to insulate it, and then treated in the same manner as in the above example to obtain an oxide superconducting cable. We also prototyped a superconducting cable with a composite superconducting conductor wound around the former without dislocation twisting.
[0025]
In the oxide superconducting cable obtained in the above example and the oxide superconducting cable obtained in the comparative example, a measurement experiment is performed under the following conditions, a critical current is obtained, a relationship between AC loss and peak current is obtained, This is shown in FIG.
External magnetic field: 0T, temperature: 77K, AC cycle: 60Hz
Critical current of one superconducting conductor: 10A
Critical current of superconducting cable: 1.2 kA
Furthermore, when the resistance value between the Ag sheath materials provided with the Hastelloy tape was measured at a liquid nitrogen temperature of 77K, it was 5.9 Ωcm ² , which was about 10,000 times higher than the structure in which the Ag sheaths were in direct contact with each other. Since it became resistance, it was grasped that it was suitable as a structure for suppressing eddy current.
[0026]
As shown in FIG. 5, it has been found that the AC loss of the superconducting cable according to the present invention is equivalent to that of the comparative superconducting cable having a structure insulated with polyimide tape. In addition, a tensile test in which a tensile tension of 30 MPa was applied to each superconducting cable was performed. However, the composite of the Hastelloy tape did not cause a decrease in the critical current density, but the composite of the polyimide tape was the critical current. The density was reduced by 20%.
Next, a prototype of a superconducting cable obtained when the composite superconducting conductor was directly wound in a multi-layer spiral without being subjected to dislocation twist was also made. However, the AC loss was 35 compared with the sample subjected to the dislocation twist described above. % Has increased.
As a result, by combining and twisting dislocation twisted hastelloy tape, AC loss can be reduced compared to those without dislocation twisting, and the AC loss value is equivalent to that of polyimide insulation, and the mechanical strength is further improved to make it critical. It has been found that it is possible to provide a superconducting cable that can prevent deterioration of the current value.
[0027]
【The invention's effect】
As described above, in the superconducting cable of the present invention, in particular, a plurality of composite superconducting conductors in which a metal tape is attached to a tape-like superconducting conductor, a dislocation superconducting tape unit formed by dislocation twisting is formed in a pipe shape. As the dislocation superconducting tape unit, a plurality of the composite superconducting conductors are stacked side by side in two rows and stacked in the thickness direction, and the plurality of the superconducting conductors are wound in the length direction. The composite superconducting conductors of the dislocation superconducting tape unit are laminated on the surface side and the bottom side, and the plurality of composite superconducting conductors arranged in two rows are laminated in the thickness direction. When the plurality of composite superconducting conductors are arranged, the width of the composite superconducting conductors arranged in two rows between the left and right rows and the upper and lower layers in the middle of their length direction. Are arranged so that ends of the plurality of composite superconducting conductors positioned at both ends in the width direction of the dislocation superconducting tape unit are aligned between upper and lower layers, and a plurality of the dislocation superconducting tape units are formed in the former. since wound in a state contacting the widthwise end portions to each other of the dislocation superconducting tape unit to the outer circumferential portion of the load of the tension or the like about to be added to the superconducting conductor metal tape is borne, mechanical strength of the cable Will improve. Further, since the metal tape bears a load, the strain acting on the superconducting conductor is reduced, and there is no possibility that the critical current density of the superconducting conductor is deteriorated.
Furthermore, when the superconducting conductor is wound around the former as it is in multiple layers, a large amount of current flows through the superconducting conductor on the outermost layer of the cable due to the influence of the self-magnetic field, and the current that actually flows toward the inner layer of the cable decreases. There is a tendency to generate a current gradient, and the critical current density decreases. With the above configuration, the generation of an interlayer current gradient can be suppressed by moving the superconducting conductor back and forth between the inner layer side and the outer layer side by twisting dislocations. . As a result, it is possible to provide a superconducting cable that can prevent drift during alternating current conduction and prevent deterioration of critical current density.
[0028]
The metal tape is made of a metal material having a higher electrical resistance and strength than the metal sheath of the superconducting conductor, and is laminated in the stacking direction of the tape-shaped superconducting conductor laminated in the thickness direction in the dislocation superconducting tape unit. As a result, a higher-strength metal tape than the metal sheath of the superconducting conductor bears a load such as tension to be applied to the superconducting conductor, so that the mechanical strength of the superconducting cable is improved. Further, since the metal tape bears a load, the strain acting on the superconducting conductor is reduced, and there is no possibility that the critical current density of the superconducting conductor is deteriorated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a superconducting cable according to the present invention.
FIG. 2 is a perspective view showing a dislocation superconducting tape unit used in a superconducting cable according to the present invention.
FIG. 3 is a cross-sectional view of the unit.
FIG. 4 is a perspective view showing a superconducting element wire before twisting in an embodiment of a superconducting cable according to the present invention.
FIG. 5 is a diagram showing an AC loss test result of a superconducting cable obtained in an example.
FIG. 6 (a) is a perspective view showing a cross section of a part of an example of a conventional oxide superconducting cable, and FIG. 6 (b) is a cross section of a part of another example of a conventional oxide superconducting cable. FIG.
7A is a schematic cross-sectional view of a conventional superconducting conductor, FIG. 7B is a schematic cross-sectional view showing an eddy current generation state in the conventional superconducting conductor, and FIG. 7C is a conventional superconducting conductor. FIG. 3 is a schematic cross-sectional view showing a state in which eddy currents are coupled when AC current is applied.
FIG. 8 is a cross-sectional view showing an eddy current generated in a superconducting conductor layer of a conventional superconducting cable.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Superconducting cable, 15 ... Dislocation superconducting tape unit, 17 ... Former (tube), 18 ... Tape-like superconducting conductor (superconducting tape), 19 ... Tape-like superconducting wire 20 ... metal tape, 25 ... superconducting multi-core wire (superconducting wire), 29 ... metal sheath.

Claims (3)

A plurality of composite superconducting conductors obtained by attaching a metal tape to a tape-shaped superconducting conductor formed by arranging a plurality of oxide superconducting cores inside a metal sheath, dislocation twisting to constitute a dislocation superconducting tape unit, A number of dislocation superconducting tape units are wound around a pipe-shaped former.
The dislocation superconducting tape unit includes a plurality of the composite superconducting conductors arranged side by side in two rows and stacked in the thickness direction, and the plurality of composite superconducting conductors are disposed in the length direction of the dislocation superconducting tape unit. When the plurality of composite superconducting conductors arranged in two rows are stacked in the thickness direction so as to repeat the case of being located on the front side and the case of being located on the bottom side, the plurality of composite superconducting conductors are The plurality of composites positioned at both ends in the width direction of the dislocation superconducting tape unit by switching within the width of the composite superconducting conductors arranged in two rows between the left and right rows and the upper and lower layers in the middle of their length direction It is arranged and arranged so that the ends of the superconducting conductor are aligned between the upper and lower layers,
Each of the dislocation superconducting tape units is wound in a state where a plurality of dislocation superconducting tape units are in contact with each other in the widthwise ends of the dislocation superconducting tape unit on the outer periphery of the former.
It said metal tape is formed of the metallic metal material having a high strength at high electrical resistance than the sheath oxide superconducting cable according to claim Rukoto. It said metal tape is an oxide superconducting cable according to claim 1, characterized by being arranged in the laminating direction above the front Symbol dislocation superconducting tape unit thickness direction layered tape-like superconducting conductor in. 3. The oxide superconducting cable according to claim 2, wherein the metal tape is made of a heat-resistant high-strength Ni alloy such as Hastelloy.

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