JP2003092034A - Transposition superconductive tape unit and superconductive application equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transposition superconductive tape unit that has good geometric symmetry and a superconductive application equipment such as a superconductive cable, a superconductive transformer, a superconductive magnet, a superconductive current limitter or the like in which drop of critical current value by its own magnetic field at the time of current flow can be improved. SOLUTION: These are a transposition superconductive tape unit 15 that is constructed by transposing and twisting the even number of superconductive conductors 18 of tape shape, a superconductive application equipment using the transposition superconductive tape unit 15, and a superconductive cable that is constructed by winding the transposition superconductive tape unit 15 around the tube of a cylindrical shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dislocation superconducting tape unit in which tape-shaped superconducting conductors are twisted together in a dislocation and a superconducting application device using the same, and more specifically, a dislocation superconducting tape unit having good geometric symmetry and the same. It relates to a superconducting applied device using.

[0002]

2. Description of the Related Art In a superconducting application device such as a superconducting cable, a superconducting transformer, a superconducting magnet, a superconducting fault current limiter or the like, a dislocation superconducting tape unit in which a plurality of tape-shaped superconducting conductors are dislocated and twisted is used. 4 is a perspective view showing an example of a superconducting cable provided with a conventional dislocation superconducting tape unit, and FIG. 5 is an explanatory view of a dislocation superconducting tape unit provided in the superconducting cable of FIG. ) Is a perspective view and (b) is a sectional view. The superconducting cable 110 shown in FIG. 4 has a structure that suppresses uneven flow when an alternating current is applied.
Reference numeral 15 is a spiral former wound around a cylindrical former 117. The dislocation superconducting tape unit 115 is a long strip-shaped one formed by twisting five dislocation superconducting conductors (superconducting tapes) 118 as shown in FIG. 5A. In the dislocation superconducting tape unit 115, when a plurality of tape-shaped superconducting conductors 118 are gathered and twisted together, each tape-shaped superconducting conductor 118 is sequentially displaced in its longitudinal direction and displaced. It is a twisted thing.

The surface of the former 117 is
7 and the dislocation superconducting tape unit 115 are insulated in order to suppress the current flow. Further, the inside of the former 117 serves as a flow path of a cooling medium, and the tape-shaped superconducting conductor 118 is cooled. In the tape-shaped superconducting conductor 118, as shown in FIG. 5B, the surface of the tape-shaped superconducting element wire 119 obtained by flattening the superconducting multi-core element wire (superconducting element wire) is subjected to sulfurization treatment. High resistance film 120
Are formed. The superconducting multifilamentary wire is
Inside the base made of a sheath material made of Ag,
A core portion made of a superconductor such as a superconducting filament or a core portion made of a material that becomes a superconductor by heat treatment is provided. As a material for the superconductor of the core portion or a superconductor by heat treatment, Bi ₂ S is used.
r ₂ Ca ₁ Cu ₂ O _x (Bi2212 phase), Bi ₂ Sr ₂ C
The one having a composition represented by a ₂ Cu ₃ O _y (Bi2223 phase) or the like is used. On the outside of the superconducting cable 110 having the above structure, a semiconductor layer, an insulating layer,
A protective layer, a heat insulating layer, an anticorrosive layer, etc. are formed and used as necessary.

[0004]

However, in the conventional dislocation superconducting tape unit 115 composed of five tape-shaped superconducting conductors (superconducting tapes) provided in the above-mentioned superconducting applied equipment, geometrical symmetry is required. It was a bad thing. The dislocation superconducting tape unit 115 having such a poor geometric symmetry is replaced with a cylindrical former 117.
When it is wound around, the vertical magnetic field component of the self magnetic field during energization remains without being cancelled, and therefore, the superconducting cable 110 using this dislocation superconducting tape unit 115 is
The critical current of will decrease. Such a problem is not limited to the superconducting cable in which the conventional transposition superconducting tape unit 115 composed of five tape-shaped superconducting conductors is wound around the former 117, and the conventional transposition superconducting tape unit 115 is wound. The same applies to the superconducting transformer and superconducting magnet used for the parts.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dislocation superconducting tape unit having good geometric symmetry. Further, the present invention, by using a dislocation superconducting tape unit having good geometric symmetry, it is possible to improve the decrease of the critical current value due to the self-magnetic field during energization, a superconducting cable, a superconducting transformer, a superconducting magnet, a superconducting fault current limiter, etc. The other purpose is to provide the superconducting application equipment.

[0006]

The present invention provides a transposition superconducting tape unit characterized in that even-numbered tape-shaped superconducting conductors are twisted by dislocations. The dislocation superconducting tape unit of the present invention having the above-described configuration preferably has a cross-sectional shape that is point-symmetric.

In the present invention, the tape-shaped superconducting conductor may be one in which the surface of the tape-shaped superconducting element wire is subjected to sulfurization treatment to form a high resistance film.
In the present invention, the tape-shaped superconducting element wire is formed by flattening a superconducting element wire provided inside a base made of a sheath material having a core portion made of a superconductor or a core portion having a material which becomes a superconductor by heat treatment. It is preferable that the high resistance film has a higher electrical resistivity than the sheath material forming the matrix. Examples of the superconductor forming the core portion or the material that becomes the superconductor by heat treatment of the core portion include, for example, Bi ₂ Sr ₂ Ca ₁ Cu ₂ O _x.
(Bi2212 phase), Bi ₂ Sr ₂ Ca ₂ Cu ₃ O _y (Bi
2223 phase), Bi _1.6 Pb _0.4 Sr ₂ Ca ₂ Cu ₃ O _x , T
l ₂ Ba ₂ Ca ₂ Cu ₃ O _y , Y ₁ Ba ₂ Cu ₃ O _7-x, etc., and high temperature superconducting materials such as oxide superconducting materials having a composition represented by Nb ₃ Sn, Nb ₃ Al, etc. One or more selected from superconducting materials having a composition described below are used. In particular, a Bi-based 2223 phase or a Bi-based 2212 is used.
It is preferable to use a Bi-based oxide superconducting material having a phase.

The sheath material is preferably made of a noble metal such as Ag, Pt, Au or an alloy thereof. The resistance-increasing film is preferably made of a sulfide of the sheath material, more preferably silver sulfide.

Further, the present invention provides a superconducting applied device characterized by using the dislocation superconducting tape unit of the present invention having any one of the above-mentioned constitutions as a means for solving the above-mentioned problems. Further, the present invention provides a superconducting cable in which the transposed superconducting tape unit of the present invention having any one of the above configurations is wound around a tubular body, as a means for solving the above problems. In the superconducting cable of the present invention, it is preferable that the tape-shaped superconducting conductor constituting the dislocation superconducting tape unit of the present invention used in this has a rectangular cross-sectional shape. The tubular body is preferably made of stainless steel.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a dislocation superconducting tape unit according to the present invention and a superconducting applied device using the same will be described below with reference to the drawings. (Embodiment of Dislocation Superconducting Tape Unit) FIG. 1 is a diagram showing an embodiment of the dislocation superconducting tape unit of the present invention, in which (a) is a perspective view and (b) is a sectional view. The dislocation superconducting tape unit 15 of the present embodiment is a long strip-shaped one in which even number (12 in the drawing) of tape-shaped superconducting conductors (superconducting tape) 18 are dislocation-twisted as shown in FIG. 1A. Is. More specifically, the dislocation superconducting tape unit 15 has a structure in which one of the laminated bodies 18a and 18a in which even number (six in the drawing) of tape-shaped superconducting conductors (superconducting tapes) 18 are laminated vertically
a and the upper and lower sides of the other laminated body 18a are arranged so as to be offset by the same number (one in the drawing) of the thickness of the tape-shaped superconducting conductor. When the tape-shaped superconducting conductors 18) are twisted together, the tape-shaped superconducting conductors 18 are twisted so that the tape-shaped superconducting conductors 18 are sequentially displaced in the longitudinal direction and displaced. The shape of the cross section of the dislocation superconducting tape unit 15 is formed so as to be point-symmetric with respect to the center point O. Specifically, the center point O
So that the corner P ₁ of the tape-shaped superconducting conductor 18 constituting the dislocation superconducting tape unit 15 coincides with the position of the corner P ₂ of the other tape-shaped superconducting conductor 18 when rotated by 180 ° about Has become.

The tape-shaped superconducting conductor 18 is shown in FIG.
As shown in (b), the surface of the tape-shaped superconducting element wire 19 is subjected to sulfurization treatment to form the high resistance film 20. The cross-sectional shape of this superconducting conductor 18 is preferably rectangular. The specific dimensions of the superconducting conductor 18 are about 1.0 mm to 5.0 mm in width and 0.1 mm in thickness.
The range is about 1.0 mm. The resistance-enhancing film 20 is made of a sulfide of a sheath material described later, and is preferably made of silver sulfide. The electric resistance of the high resistance film 20 is higher than that of the sheath material forming the matrix 29, which will be described later, so that the surface of the tape-shaped superconducting conductor 18 can be made high in resistance and adjacent to each other. A tape-shaped sheath material 29 for the superconducting conductor 18
This is preferable in that the eddy current does not conduct to each other and the eddy current can be retained inside each of the tape-shaped superconducting conductors 18. For example, the base 29 has a low electrical resistivity of Ag (7
When the electrical resistivity at 7K is 0.3 μΩcm or the like, the high resistance film 20 around the base 29 has a high electrical resistivity of silver sulfide (at 77K, about 10 ³ times the electrical resistivity of Ag). It has the above electrical resistivity) and the like.

The tape-shaped superconducting element wire 19 is formed by flattening a superconducting multi-core element wire (superconducting element wire) 25 as shown in FIG. The cross-sectional shape of this superconducting element wire 19 is preferably rectangular. This superconducting element 1
9 has a width of about 1.0 mm to 5.0 mm and a thickness of 0.1 mm
The range is about 1.0 mm. The superconducting multifilamentary wire 25 is provided inside a base 29 made of a sheath material in which a core portion 28 made of a plurality of superconductors 27 such as superconducting filaments or a core portion 28 having a material 27 to be a superconductor by heat treatment is formed. It will be.

Superconductor 27 of core 28 or heat treatment
As the material 27 that becomes a superconductor by, for example, Bi
₂Sr₂Ca₁Cu₂O_x (Bi2212 phase), Bi₂Sr₂
Ca ₂Cu₃O_y(Bi2223 phase), Bi_1.6Pb_0.4S
r₂Ca₂Cu₃O_x, Tl₂Ba ₂Ca₂Cu₃O_y, Y₁Ba
₂Cu₃O_7-xOxide superconducting material with composition shown by
Materials such as high temperature superconducting materials and Nb₃Sn, Nb₃Al
Selected from among the superconducting materials with the composition
One or more types are used, in particular, Bi-based 2223 phase
Or use Bi-based 2212 phase Bi-based oxide superconducting material
Can be The sheath material forming the base 29 is A
No precious metals such as g, Pt, Au or their alloys
One is used.

Further, the above dislocation superconducting tape unit 1
A fixing tape 36 made of polyimide resin or the like is partially wound around 5, and is fixed so that the dislocation twists of the even number of dislocation-twisted tape-shaped superconducting conductors 18 are not broken.

Next, an example of a method of manufacturing the dislocation superconducting tape unit 15 shown in FIG. 1 will be described in the order of steps. [Raw powder processing step] raw material powder of the oxide superconductor material, for example, _{Bi 2 O 3, PbO, SrCO} 3, CaCO 3, Cu
O is mixed such that the mixing ratio of Bi: Pb: Sr: Ca: Cu is 1.8: 0.4: 2.2: 3.0, and the mixture is mixed in the range of 780 ° C to 820 ° C. The heat treatment (calcination) performed under temperature conditions and the pulverization after the calcination are repeated multiple times. Here, the raw material powder to be mixed is
In addition to the above, any oxide or carbonate of each element of Bi, Pb, Sr, Ca and Cu may be used. [Filling Step] The crushed raw material powder is formed into a cylindrical body by, for example, CIP (cold isostatic pressing) molding, and then the cylindrical body is filled and sealed in a first pipe made of a sheath material such as Ag. Sheath material composite (Ag sheath composite)
To form.

[Wire drawing (pulling) process of single-core wire] The above-mentioned sheath material composite (Ag sheath composite) is wire-drawn to a predetermined wire diameter with a die or the like to obtain a superconducting single-core wire (single wire). Form a core line). [Multi-core process] After arranging a predetermined number (for example, 19) of the above-mentioned single-core wires inside the second pipe made of a sheath material such as Ag and enclosing it, a predetermined wire diameter is obtained by a die or the like. The wire drawing process is performed until a superconducting multi-core element wire (superconducting element wire) 25 as shown in FIG. 2 is formed.

[Repeating Step of Heat Treatment for Superconducting Element Wire] The superconducting multifilamentary element wire 25 is subjected to rolling processing such as roll rolling.
It is rolled to a predetermined thickness and flattened. As an apparatus used for the rolling process here, for example, a double rolling machine provided with a pair of upper and lower rolls, and a superconducting multi-core wire 25 between the rolls.
A rolling device (not shown) composed of a conveyer including a feeding drum that feeds out the superconducting multicore wire 25 rolled between the rolls and a winding drum that winds up the superconducting multicore element wire 25 is preferably used. In order to roll the superconducting multifilamentary wire 25 using such a rolling device, the superconducting multifilamentary wire 25 is fed from the delivery drum between the rolls and rolled, and the rolled superconducting multifilamentary wire 25 is rolled. It is performed by winding with a winding drum. Then, the flattened superconducting multi-core wire 25 is housed inside an electric furnace or the like in a wound state on 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. The heat treatment is performed in the range of up to 200 hours. Further, the rolling process (or pressing process) and the heat treatment are repeated a plurality of times to form a tape-shaped superconducting element wire 19 having a predetermined thickness.

[Sulfurization Step of Superconducting Element Wire] The surface of the tape-shaped superconducting element wire 19 is subjected to sulfurization treatment to obtain a high resistance film 2
By forming 0, a tape-shaped superconducting conductor (superconducting tape) 18 as shown in FIG. 1 is formed. Examples of the apparatus used for the sulfurization treatment include a reaction vessel that can be evacuated and is filled with sulfur vapor, a delivery drum that delivers the tape-shaped superconducting element wire 19 into the reaction vessel, and the above reaction. A sulfidation treatment device including a winding drum that winds the tape-shaped superconducting element wire 19 that has been subjected to sulfidation treatment in the container is preferably used. The reaction container is formed with an introduction hole for introducing the tape-shaped superconducting element wire 19 into the inside and a lead-out hole for leading out the introduced tape-shaped superconducting element wire 19. At the peripheral portion of the hole, a sealing mechanism is provided to close the gap between the holes while allowing the tape-shaped superconducting element wire 19 to pass therethrough to make the inside of the reaction vessel airtight. The reaction container is equipped with a heater (not shown) so that the reaction container can be heated.

In order to perform the sulfurating treatment on the surface of the tape-shaped superconducting element wire 19 by using such a sulfurizing treatment apparatus, the inside of the reaction vessel is evacuated and then the sulfur in the predetermined temperature range is placed in the reaction vessel. The steam is supplied, and then the tape-shaped superconducting element wire 19 is sent out from the delivery drum into the reaction vessel filled with the sulfur vapor, and the tape-shaped superconducting element wire 19 that has been subjected to sulfurization is wound up. When wound on a drum, a tape-shaped superconducting conductor (superconducting tape) 18 having a high resistance film 20 on its surface is obtained. Examples of the sulfur vapor supplied into the above reaction vessel include sulfur dichloride, disulfur dichloride, sulfur dioxide and the like.
The temperature of the sulfur vapor supplied into the reaction vessel,
It is set within the range of about 50 ° C to 170 ° C. The temperature inside the reaction vessel is such that the supplied sulfur vapor does not liquefy. The sulfurization time is 60 to 3
It is about 0000 seconds. The sulfiding time here can be changed by the linear velocity of the tape-shaped superconducting element wire 19 fed into the reaction vessel.

[Dislocation Twisting Step] An even number (12 in this embodiment) of the tape-shaped superconducting conductors 18 are twisted at a predetermined dislocation pitch by using a dislocation twisting machine as shown in FIG. The dislocation superconducting tape unit 15 is formed. The dislocation pitch here is 20 mm to 500
It is within a range of about mm.

Dislocation superconducting tape unit 1 of this embodiment
According to No. 5, even-numbered tape-shaped superconducting conductors 18 are formed by twisting dislocations, so that a dislocation superconducting tape unit having good geometric symmetry can be obtained.
In the present embodiment, the dislocation superconducting tape unit 15
Although the description has been made of the case where the tape-shaped superconducting conductor 18 is composed of 12 tape-shaped superconducting conductors 18, the number of tape-shaped superconducting conductors 18 (however, even number) can be selected according to the required superconducting characteristics and mechanical strength. It is possible to provide a dislocation superconducting tape unit having desired characteristics.

(Embodiment of Superconducting Cable) FIG. 3 is a perspective view showing an embodiment of a superconducting cable using the transposed superconducting tape unit according to the embodiment of the present invention. The superconducting cable 10 is formed by spirally winding a transposed superconducting tape unit 15 around a pipe-shaped former (tubular body) 47. As the dislocation superconducting tape unit 15 used here, the dislocation superconducting tape unit 15 of the embodiment shown in FIGS. 1 and 2 described above is used.
The winding direction of the dislocation superconducting tape unit 15 is the direction of S winding (right winding) or the direction of Z winding (left winding).

The former 47 is made of stainless steel or the like. The surface of such a former 47 is
Insulation is applied to suppress the energization between the former 47 and the dislocation superconducting tape unit 15. The inside of the former 47 serves as a flow path for a cooling medium such as liquid nitrogen, and cools the tape-shaped superconducting conductor 18 constituting the dislocation superconducting tape unit 15.

As a method of manufacturing the superconducting cable 40 having such a structure, for example, the former 4 having a plurality of sets of the above-mentioned dislocation superconducting tape units 15 whose surface is insulated.
The superconducting cable 40 as shown in FIG. 3 is obtained by winding the wire 7 around the wire 7 with a predetermined spiral pitch in a Z winding or an S winding. The spiral pitch here is within a range of about 100 to 2000 mm. Outside the superconducting cable 40 having such a structure, a semiconductor layer, an insulating layer, a protective layer, a heat insulating layer, an anticorrosive layer, etc., which are not shown, are formed and used as necessary.

In the superconducting cable 40 of this embodiment, the dislocation superconducting tape unit 15 of the embodiment of the present invention having good geometrical symmetry is used as the dislocation superconducting tape unit wound around the cylindrical former 47. Since the vertical magnetic field component of the self-magnetic field during energization of this superconducting cable is canceled, it is possible to reduce the decrease in the critical current value due to the self-magnetic field during energization, and to have excellent superconducting properties. You can In the above-described embodiment, the case where the transposition superconducting tape unit of the embodiment of the present invention is used for the superconducting cable has been described, but the transposition superconducting tape unit of the present invention is a superconducting transformer, a superconducting magnet, or a superconducting fault current limiter. It can be used for the winding part of superconducting equipment such as. In the superconducting application device in which the dislocation superconducting tape unit of the present invention is used in the winding portion, the vertical magnetic field component of the self-magnetic field at the time of energization is canceled, so that the reduction of the critical current value due to the self-magnetic field at the time of energization is reduced. In addition, it can have excellent superconducting properties.

[0026]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. _{(Example) Bi 2 O 3, PbO,} SrCO 3, CaCO 3,
CuO was mixed so that the mixing ratio of Bi: Pb: Sr: Ca: Cu was 1.8: 0.4: 2.2: 3.0,
Heat treatment (calcination) performed at a temperature of 800 ° C
And crushing after the calcination are repeated multiple times,
A raw material powder was obtained. This raw material powder was made into a cylindrical shape by CIP (cold isostatic pressing), and had an outer diameter of 15 mm and an inner diameter of 1
The inside of a 0 mm Ag pipe (first pipe) was filled and sealed to obtain an Ag sheath composite. This Ag sheath composite was drawn by a die or the like to a wire diameter of 1.9 mm to form a single core wire. Next, outer diameter 15 mm, inner diameter 10 m
After placing 19 of the above-mentioned single-core wires inside the Ag pipe (second pipe) of m, and enclosing, the wire was drawn to a wire diameter of 0.9 mm with a die or the like, and the superconducting multi-core wire Was formed.

This superconducting multifilamentary wire was flattened by rolling it to a thickness of 0.30 mm by using a rolling device consisting of a double rolling mill and a conveyor. Further, the flattened superconducting element wire is housed in the electric furnace in a state of being wound around a heat treatment drum, the temperature condition is 830 ° C., and the processing time is 150
Heat treatment was performed for a period of time. Further, the above-mentioned rolling process (or pressing process) and heat treatment were repeated a plurality of times to form a tape-shaped superconducting element wire having a rectangular cross section with a width of 2.0 mm and a thickness of 0.20 mm. Then, the inside of the reaction vessel was evacuated using a sulfurization treatment apparatus, sulfur vapor of about 150 ° C was supplied to the reaction vessel, and then a tape-shaped superconducting element wire was drawn from the delivery drum at a linear velocity of 20 cm / hour. When the tape-shaped superconducting element wire that has been subjected to sulfurization and is sent into a reaction vessel filled with the above-mentioned sulfur vapor is wound up by a winding drum, a tape having a high resistance film made of black silver sulfide on the surface A superconducting conductor (superconducting tape) was obtained. The atmospheric pressure in the reaction vessel here was about 1 atm.

Then, the above six tape-shaped superconducting conductors thus prepared were used with a dislocation twisting machine to give a dislocation pitch of 100 mm.
Then, the dislocations were twisted together to obtain a dislocation superconducting tape unit (Example 1). The dislocation superconducting tape unit of Example 1 obtained here had good geometric symmetry. Further, the seven tape-shaped superconducting conductors thus prepared were twisted with a dislocation twisting machine at a dislocation pitch of 100 mm to obtain a dislocation superconducting tape unit (Comparative Example 1). The dislocation superconducting tape unit of Comparative Example 1 obtained here had poor geometric symmetry. The tape-shaped superconducting element wires used in the dislocation superconducting tape units of Example 1 and Comparative Example 1 had a critical current of 30 at 77 K and 0 Tesla.
A's.

Next, the superconducting cable of the example prepared by winding 21 dislocation superconducting tape units of the example 1 obtained as described above around the former (tubular body) having an outer diameter of 22 mm, and the outside. A superconducting cable of Comparative Example produced by winding 18 dislocation superconducting tape units of Comparative Example 1 obtained as described above around a former (tubular body) having a diameter of 22 mm was subjected to a direct magnetic field and a vertical magnetic field, respectively. 77
The critical current at K, 0 Tesla was measured. The results are shown in Table 1 below. The decrease rate of the critical current in Table 1 is the sum of the critical current values of the tape-shaped superconducting element wires used in the superconducting cable (the number of dislocation superconducting tape units used in the superconducting cable × 1 superconducting tape used in the dislocation superconducting tape unit). The sum of the critical current values for the number of strands) is 100
%, Which is the rate of decrease in the critical current of the superconducting cable.

[0030] "Table 1"                             Vertical magnetic field Critical current decrease rate Example superconducting cable 1.43 Gauss / A 5%                         (0.143mT / A) Superconducting cable of comparative example 2.09Gauss / A 11%                         (0.209 mT / A)

From the results shown in Table 1, the dislocation superconducting tape unit used in the superconducting cable of the comparative example has an odd number of tape-shaped superconducting conductors and has poor geometric symmetry, and therefore has a cylindrical shape. It can be seen that in the case of spiral winding on the former, the vertical magnetic field component remains without being canceled, the rate of decrease in the critical current value due to the self-magnetic field during direct current application is large, and the superconducting property is deteriorated. On the other hand, the dislocation superconducting tape unit used in the superconducting cable of the example has good geometrical symmetry because it is an even number of tape-shaped superconducting conductors dislocation-twisted, and therefore spirally wound on a cylindrical former. In this case, since the vertical magnetic field component is canceled, the rate of decrease in the critical current value due to the self magnetic field during direct current application is small, and the superconducting characteristics are excellent.

[0032]

As described above, according to the dislocation superconducting tape unit of the present invention, even number of tape-shaped superconducting conductors are formed by dislocation twisting, so that the dislocation superconducting tape unit having good geometrical symmetry. Can be Further, according to the superconducting application device of the present invention, since the dislocation superconducting tape unit of the present invention having good geometrical symmetry is used in the winding portion, the vertical magnetic field component of the self magnetic field during energization is canceled and It is possible to reduce the decrease in the critical current value due to the self-magnetic field at that time, and to have excellent superconducting properties. Further, according to the superconducting cable of the present invention, the dislocation superconducting tape unit of the present invention having good geometrical symmetry is used as the dislocation superconducting tape unit wound around the cylindrical tubular body. Since the vertical magnetic field component of the self magnetic field when the superconducting cable is energized is canceled, it is possible to reduce the decrease in the critical current value due to the self magnetic field when energizing, and it is possible to provide excellent superconducting properties.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of a dislocation superconducting tape unit of the present invention, in which (a) is a perspective view,
(B) is a sectional view.

FIG. 2 is an explanatory diagram of a superconducting element wire used in a tape-shaped superconducting element wire that constitutes the dislocation superconducting tape unit of FIG.

FIG. 3 is a perspective view showing an embodiment of a superconducting cable of the present invention.

FIG. 4 is a perspective view showing an example of a conventional superconducting cable provided with a transposed superconducting tape unit.

5 is an explanatory view of a transposed superconducting tape unit included in the superconducting cable of FIG. 4, (a) being a perspective view;
(B) is a sectional view.

[Explanation of symbols]

15 ... Dislocation superconducting tape unit, 18 ... Tape-shaped superconducting conductor (superconducting tape), 19 ... Tape-shaped superconducting element wire, 20 ... High resistance film, 25 ... Superconducting multi-core Strands (superconducting strands), 27 ... Superconductor or material to be a superconductor, 28 ... Core part, 29 ... Base (sheath material), 4
0 ... Superconducting cable, 47 ... Forma (tube).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Goto             1-5-1 Kiba Stock Exchange, Koto-ku, Tokyo             Inside Fujikura (72) Inventor Kaoru Takeda             1-5-1 Kiba Stock Exchange, Koto-ku, Tokyo             Inside Fujikura (72) Inventor Naoji Kashima             20 Kitakanzan, Otakamachi, Midori-ku, Nagoya-shi, Aichi             No. 1 Chubu Electric Power Co., Inc. (72) Inventor Shigeo Nagaya             20 Kitakanzan, Otakamachi, Midori-ku, Nagoya-shi, Aichi             No. 1 Chubu Electric Power Co., Inc. F-term (reference) 5G321 AA01 AA11 AA12 BA01 BA03                       BA04 CA18 CA30 CA44 DA02                       DA06

Claims (4)

[Claims] 1. A dislocation superconducting tape unit, wherein an even number of tape-shaped superconducting conductors are twisted together with dislocations. 2. The dislocation superconducting tape unit according to claim 1, wherein the cross-sectional shape is point-symmetrical. 3. A superconducting application device comprising the dislocation superconducting tape unit according to claim 1 or 2. 4. A superconducting cable, characterized in that the transposed superconducting tape unit according to claim 1 or 2 is wound around a tubular body.