JP6401489B2 - Superconducting cable and superconducting equipment - Google Patents

Description

  Embodiments described herein relate generally to a superconducting cable and a superconducting device.

  Superconducting cables are attracting attention as a technology that can solve the shortage of transmission line capacity in areas where power demand increases and can reduce loss during power transmission. As a superconducting cable, a superconducting cable is known in which an oxide superconducting conductor processed into a wire is spirally wound around a former. In such a superconducting cable, a wire made of an oxide superconductor (oxide superconducting wire) is wound in multiple layers via an insulating layer.

  In the above-described superconducting cable, a drift phenomenon in which the current value flowing through each layer is not uniform easily occurs due to the difference in impedance between the layers of the superconducting conductor. That is, the current density is smaller in the superconducting layer on the inner circumference of the superconducting cable, and the current density tends to be larger in the outer superconducting layer. Since AC loss increases when a drift phenomenon occurs, various studies have been made to suppress the drift (for example, Patent Document 1).

  In the superconducting cable, a biased current may flow not only between layers but also between superconducting wires in the same layer. If the flowing currents are different in the same layer, there is a problem that not only the current load increases on a specific wire and the risk of heat generation increases, but also the surrounding magnetic field state becomes unstable and AC loss increases. In order to deal with such a problem, Patent Document 2 discloses a structure in which superconducting conductors in the same layer are short-circuited at a short-circuit portion. With such a structure, the current in the layer is uniformly distributed in the short-circuit portion.

JP 2005-353593 A JP 2001-256841 A

  However, the short circuit part of patent document 2 is formed so that between the superconducting wires of the same layer may be embedded. Thus, in order to embed the superconducting wires, solder is generally used for the short-circuit portion, but the short-circuit portion becomes hard and may be damaged by bending. In addition, when trying to connect the superconducting wires with solder, a resistance depending on the distance between adjacent superconducting conductors is generated. Since the distances between adjacent superconducting conductors do not completely coincide, there is a problem that the superconducting conductors are not completely equalized due to this.

  The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to provide a superconducting cable in which the current flowing through the superconducting conductor in the same layer is leveled.

The superconducting cable of the present invention includes a core material, a plurality of tape-shaped superconducting wires that form a wire layer made of a superconducting wire spirally wound around an outer peripheral side of the core material, and the wire layer It has a short-circuit superconducting wire you short superconducting wires to each other, the.
According to this configuration, the current flowing in each superconducting wire can be made uniform by short-circuiting the superconducting wires arranged in the same layer with the short-circuiting superconducting wire. Thereby, it is possible to prevent the current from concentrating on a part of the superconducting wires in the same layer, and to reduce the risk that the current flowing through the superconducting wire exceeds the critical current value. In addition, a designed magnetic field is formed around the superconducting cable, and AC loss can be reduced.
In the superconducting cable, the short-circuit superconducting wire may be in a tape shape.
In the superconducting cable, the short-circuit superconducting wire may have the same layer structure as the superconducting wire.

In the superconducting cable, the short-circuit superconducting wire may be wound around the wire layer by one or more turns via solder.
According to this configuration, the superconducting wires can be electrically connected to each other in the same layer. Also, by joining the short-circuit superconducting wire around the superconducting wire in the same layer via solder, the connection between the short-circuit superconducting wire and the superconducting wire is performed in close contact with each other. It is possible to reduce the variation in current flowing through each superconducting wire.

In the superconducting cable, the short-circuit superconducting wire may be disposed at the end of the superconducting cable.
By forming the short-circuit superconducting wire at the end of the cable, it is possible to suppress the current from concentrating on a part of the superconducting wire over the entire superconducting cable. In addition, such a short-circuit superconducting wire can be formed when connecting the superconducting cable and the power generator. That is, as compared with the case where it is provided in the middle of the superconducting cable, it can be easily formed, and a short-circuit portion that exhibits stable performance can be formed.

In the superconducting cable, the interval between the short-circuited superconducting wires arranged in the longitudinal direction of the superconducting cable may be equal to or shorter than the length at which the superconducting cable exhibits a voltage drop corresponding to 1 μV / cm.
According to this configuration, when an alternating current is passed through the superconducting cable, the superconducting wire of the superconducting cable can stably supply power without exceeding the critical current value.

In the above superconducting cable, the critical current value of the short-circuit superconducting wire may be larger than the difference between the average value and the minimum value of the critical current values of the plurality of tape-shaped superconducting wires constituting the wire layer.
According to this configuration, by setting the critical current value of the short-circuit superconducting wire as described above, when there is a wire having a low critical current value in the superconducting wire in the same layer, the short-circuit superconducting wire is used as a bypass. Current can be assigned to the wire. Thereby, a current does not flow beyond the critical current value in the superconducting wire, and burning of the superconducting wire can be prevented.

In the superconducting cable, a first wire layer made of a plurality of tape-shaped first superconducting wires wound spirally around the core material and a first short circuit between the first superconducting wires. A second circuit comprising a short-circuit superconducting wire, an insulating layer provided on the outer peripheral side of the first wire layer, and a plurality of tape-like second superconducting wires wound spirally around the insulating layer. A wire layer; and a second short-circuited superconducting wire that short-circuits the second superconducting wires, wherein the first short-circuited superconducting wire and the second short-circuited superconducting wire are in the length direction of the superconducting cable. May be provided at different positions.
According to this configuration, the first short-circuited superconducting wire and the second short-circuited superconducting wire are located at different positions in the length direction of the superconducting cable, thereby suppressing an increase in the outer diameter of the superconducting cable. it can.

The superconducting device according to an embodiment includes a coil core and a plurality of tape-shaped superconducting wires wound in parallel around the coil core and connected in parallel, and the plurality of superconducting wires are short-circuited to each other. has a short-circuit superconducting wire you, the.
According to this configuration, a current can be allocated and flowed to a plurality of superconducting wires that are coiled in parallel. Therefore, it is possible to configure a superconducting device that exhibits stable performance with little AC loss.
In the superconducting device, the short-circuit superconducting wire may have a tape shape.
In the superconducting device, the short-circuit superconducting wire may have the same layer structure as the superconducting wire.

  According to the present invention, the current flowing through each superconducting wire can be allocated by short-circuiting the superconducting wires disposed in the same layer with the short-circuiting superconducting wire. Thereby, it is possible to prevent the current from concentrating on a part of the superconducting wires in the same layer, and to reduce the risk that the current flowing through the superconducting wire exceeds the critical current value. In addition, a designed magnetic field is formed around the superconducting cable, and AC loss can be reduced.

It is a partial section schematic diagram showing the structure of the superconducting cable of a 1st embodiment. It is a partial section schematic diagram showing the structure of the superconducting cable of the modification of a 1st embodiment. It is a perspective view which shows the short circuit structure of 2nd Embodiment. It is sectional drawing of the superconducting fault current limiter provided with the short circuit structure of 2nd Embodiment.

  Hereinafter, embodiments of an oxide superconducting wire according to the present invention will be described with reference to the drawings. In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

<First Embodiment>
FIG. 1 shows a partial cross-sectional schematic view of a superconducting cable 1 as a first embodiment.
The superconducting cable 1 has a cable core 85 and a metal heat insulating double tube 84 that houses the cable core 85.
The heat insulating double tube 84 has flexibility. The heat insulating double tube 84 includes an inner tube 84a and an outer tube 84c, and a vacuum heat insulating layer 84b is formed between the inner tube 84a and the outer tube 84c, thereby eliminating the influence of heat from the outside. It has a structure to do. A cable core 85 is accommodated inside the inner pipe 84a with a gap 87 for circulating the refrigerant.

The cable core 85 has a multi-layer structure, and a former (core material) 81, a first wire material layer 6, an insulating layer 82, a second wire material layer 7, a cable stabilization layer 86, in order from the inside. And a protective layer 83.
The former 81 is made of a stranded wire made of metal (for example, copper). The first wire layer 6 is formed by spirally winding a plurality of rows of tape-shaped superconducting wires 2 around a former 81. An insulating layer 82 is formed around the first wire layer 6 to insulate the inner layer (first wire layer 6) and the outer layer (second wire layer 7) of the insulating layer 82. . Similar to the first wire layer 6, the second wire layer 7 is formed by spirally winding a plurality of rows of tape-like superconducting wires 3. As the superconducting wire 3 constituting the second wire layer 7, the same wire as the superconducting wire 2 constituting the first wire layer 6 may be used, or a wide wire may be used. FIG. 1 shows an example in which the spiral directions of the superconducting wire 2 of the first wire layer 6 and the superconducting wire 3 of the second wire layer 7 are matched, but the spiral directions may be opposite to each other. .
The cable stabilization layer 86 is made of a conductive metal and plays a role of stabilizing the current flowing through the cable. The protective layer 83 serves to protect the cable core 85 from the refrigerant.

The tape-shaped superconducting wires 2 and 3 of the present embodiment are RE123-based oxide superconducting wires in which an alignment intermediate layer, an RE-based superconducting layer, and a stabilizing layer are formed on a metal substrate, and the dimensions are 3 to 3 in width. The thickness is about 10 mm and the thickness is about 0.5 mm. A bismuth-based multi-core oxide superconducting wire can also be applied.
The superconducting wires 2 and 3 are spirally wound in the superconducting cable 1 so that the metal substrate is disposed inside and the stabilization layer is disposed outside.

  In the present embodiment, the wire layer formed by spirally winding the superconducting wires 2 and 3 has a two-layer structure of the first wire layer 6 and the second wire layer 7, but more than this. These layers may be formed. Further, a superconducting shield layer may be formed on the outer periphery of the second wire layer 7 via an insulating layer. In this case, a wire similar to the superconducting wires 2 and 3 of the first and second wire layers 6 and 7 can be spirally wound as the superconducting shield layer. By providing the superconducting shield layer, the electromagnetic field generated by the current that can flow through the superconducting conductor layer can be canceled out so that the influence of the electromagnetic field does not affect the outside of the superconducting cable 1.

A first short-circuit superconducting wire 4 is wound around the first wire layer 6 to form a first short-circuit portion 10.
The first short-circuit superconducting wire 4 is wound around the first wire layer 6 so that the end portions 4a and 4a are abutted with each other. The first short-circuit superconducting wire 4 and the superconducting wire 2 of the first wire layer 6 are connected via solder 8.
The superconducting wire 2 of the first wire layer 6 has a base material on the inner peripheral side and a stabilization layer on the outer peripheral side. Moreover, the 1st short circuit superconducting wire 4 can use the wire of the same layer structure and width as the superconducting wire 2 of the 1st wire layer 6, and is wound by making the stabilization layer side into an inner side. The first short-circuit superconducting wire 4 and the superconducting wire 2 are arranged such that their stabilization layers face each other, and the stabilization layers are joined by solder 8.
In the 1st short circuit part 10, all the several superconducting wire 2 which comprises the 1st wire layer 6 is short-circuited. Therefore, the 1st short circuit part 10 can equalize the electric current which flows into the several superconducting wire 2 spirally wound in parallel.

  A second short-circuit superconducting wire 5 is wound around the second wire layer 7 to form a second short-circuit portion 11. The second short circuit portion 11 is formed by shifting the position of the superconducting cable 1 in the length direction with respect to the first short circuit portion 10. The superconducting cable 1 in the portion where the first and second short-circuit portions 10 and 11 are formed has an outer diameter that is thicker by the thickness of the first and second short-circuit superconducting wires 4 and 5. By disposing the first and second short-circuit parts 10 and 11 in the length direction of the superconducting cable 1 (at different positions), the outer diameter of the superconducting cable 1 does not become extremely thick.

The second short-circuit superconducting wire 5 has the same layer structure and width as the superconducting wire 3 of the second wire layer 7. The second short-circuit superconducting wire 5 is wound around the second wire layer 7 so that the end portions 5a and 5a are abutted with each other. The second short-circuit superconducting wire 5 can use a wire having the same layer structure and width as the superconducting wire 3 of the second wire layer 7. Further, the superconducting wire 3 and the second short-circuited superconducting wire 5 constituting the second wire layer 7 are bonded to each other by solder 8.
All the superconducting wires 3 constituting the second wire rod layer 7 are short-circuited by the second short-circuit portion 11, and the current flowing through each superconducting wire 3 is equalized.

  The first and second short-circuit superconducting wires 4 and 5 are joined to the outer periphery of the first and second wire layers 6 and 7 via solder 8. The first and second short-circuited superconducting wires 4 and 5 and the superconducting wires 2 and 3 are joined with each other in close contact with each other. Accordingly, the thickness of the solder 8 is very thin (a maximum of several μm), and the connection resistance can be reduced. Furthermore, since the wires are brought into close contact with each other, the thickness of the solder 8 is uniform, and variations in connection resistance can be reduced. In addition, since the connection resistance due to the solder 8 is small, there is almost no difference in current flowing through each wire due to variation in connection resistance.

Moreover, the 1st short circuit superconducting wire 4 WHEREIN: When there exists a wire with a low critical current value in the some superconducting wire 2 which comprises the 1st wire layer 6, the electric current exceeding the critical current value of this wire is sent to another wire. It can be sorted and flowed.
The first short-circuit superconducting wire 4 applies the same voltage to the plurality of superconducting wires 2 and causes a current to flow evenly through the wires. However, when there is a variation in the critical current value of the superconducting wire 2 constituting the first wire layer 6, the evenly flowed current value may exceed the critical current value of the superconducting wire 2 having the lowest critical current value. is there. At this time, the surplus current can be distributed to other wires through the first short-circuit superconducting wire 4. Therefore, current exceeding the critical current value does not flow through the superconducting wire 2 and the superconducting wire 2 can be prevented from being burned out.

The critical current value Ic _S of the first short-circuit superconducting wire 4 is preferably larger than the difference between the average value Ic _AVE of the critical current values of the plurality of superconducting wires 2 constituting the first wire layer 6 and the minimum value Ic _MIN. .
That is, it is preferable to configure the critical current value Ic _S of the first short-circuit superconducting wire 4 so as to follow the following formula.
Ic _S > Ic _AVE -Ic _MIN

When there is a wire having a low critical current value among the plurality of superconducting wires 2 constituting the first wire layer 6, the first short-circuit superconducting wire 4 distributes the current that cannot be passed by this wire to other superconducting wires. Let it flow. When the critical current value of the superconducting wire having the lowest critical current value among the superconducting wires constituting the first wire layer 6 is Ic _MIN , when the current value flowing through the wire reaches the critical current value Ic _MIN , A current is passed through another superconducting wire via the short-circuit portion 10. The critical current value Ic _S of the first short-circuit superconducting wire 4 of the first short-circuit portion 10 is the difference between the critical current value Ic _MIN of the wire with the lowest critical current value and the average value Ic _AVE of the critical current values of the other wires. With the above critical current value, the current can be bypassed to other wires in this way.
Therefore, the critical current value Ic _S of the first short-circuit superconducting wire 4 is preferably equal to or greater than Ic _AVE −Ic _MIN .

  Similarly, when the second short-circuit superconducting wire 5 has a wire with a low critical current value among the plurality of superconducting wires 3 constituting the second wire layer 7, the second short-circuit superconducting wire 5 generates a current exceeding the critical current value of this wire. It can be distributed and distributed to the wire. Like the first short-circuit superconducting wire 4, the critical current value of the second short-circuiting superconducting wire 5 is preferably larger than the difference between the average and the minimum value of the plurality of superconducting wires 3 constituting the second wire layer 7.

The first and second short-circuit portions 10 and 11 are preferably provided at the end of the superconducting cable 1.
For example, a power generation device that supplies power is connected to the end of the superconducting cable 1. The connection between the end portion of the superconducting cable 1 and such a power generation device is performed by solder bonding with a terminal extending from the power generation device. In solder bonding with a terminal, it is difficult to connect to the superconducting wires 2 and 3 constituting the first and second wire layers 6 and 7 of the superconducting cable 1 with the same connection resistance. Accordingly, the plurality of superconducting wires 2 constituting the first wire layer 6 and the plurality of superconducting wires 3 constituting the second wire layer 7 are connected to the power generator by different connection resistances. Since the superconducting wires 2 and 3 have a resistance value of 0 at a low temperature, the flowing current greatly changes due to a slight difference in connection resistance.
By providing the first and second short-circuit portions 10 and 11 at the end portion of the superconducting cable 1, the influence due to the difference in the current value caused by the connection resistance at the end portion of the superconducting cable 1 is spread over the entire area of the superconducting cable 1. Can be eliminated.

  Further, when the superconducting cable 1 is connected to a power generation device or the like, the respective layers at the end are exposed as shown in FIG. Since the first and second wire layers 6 and 7 are exposed in the vicinity of the end portions, the first and second short-circuit portions 10 and 11 can be easily formed. Moreover, since it is not necessary to perform the process of exposing each layer of the superconducting cable 1 in order to form the 1st, 2nd short circuit parts 10 and 11, the short circuit part which exhibits the stable performance can be formed.

  Such a superconducting cable 1 can be used as a cable for passing any direct current or alternating current. When a direct current flows, it is desirable to provide as many (as short intervals as possible) the first and second short-circuit portions 10 and 11 in addition to the ends of the superconducting cable 1. By providing as many first and second short-circuit portions 10 and 11 as possible, it is possible to reduce the risk that the superconducting wire generates heat by suppressing the current from concentrating on the specific superconducting wire.

In addition, when an alternating current flows, the first and second short-circuit portions 10 and 11 are spaced at intervals shorter than the end of the superconducting cable 1 so that the voltage drop of the superconducting cable 1 reaches the critical current reference 1 μV / cm. It is preferable that it is formed.
The superconducting wire does not generate voltage because its resistance value is zero below the critical temperature. However, when the flowing current I approaches the critical current value Ic, a voltage V represented by V∝I ⁿ (n value is a constant) is generated. In general, in the measurement of the critical current value Ic of an oxide superconducting wire, a large current is gradually passed through the oxide superconducting wire, and the current value at which a voltage of 1 μV per cm is generated is determined as the critical current value. That is, when the voltage drop reaches the critical current reference 1 μV / cm, the critical current value Ic is reached, and the superconducting wire may generate heat.
Therefore, the risk that the superconducting wire generates heat can be reduced by providing the first and second short-circuit portions 10 and 11 at shorter intervals than the voltage drop reaches the critical current reference of 1 μV / cm.

As an example, a case will be described in which the inductance of the superconducting wire 2 constituting the first wire layer 6 of the superconducting cable 1 is 10 μH / m and an alternating current having a frequency of 50 Hz and 100 A is passed. The voltage drop of the superconducting wire 2 is 50 mV according to the calculation formula of 10 μH / m × 50 Hz × 100 A. Considering the critical current reference of 1 μV / cm, it is desirable to form the first short-circuit portions 10 at intervals of 500 m or less.
The inductance of the superconducting wire 3 constituting the second wire layer 7 is substantially the same or slightly smaller than that of the superconducting wire 2 of the first wire layer 6. Since the second wire layer 7 is configured to pass the same current as the first wire layer 6, the second short-circuit portions 11 may be formed at the same interval also in the second wire layer 7.

<Modification>
FIG. 2 shows a partial cross-sectional schematic view of a superconducting cable 9 according to a modification of the present embodiment. The superconducting cable 9 is different from the above-described superconducting cable 1 in the configuration of the first and second short-circuit portions 10A and 11A.
The first short-circuit superconducting wire 4A of the first short-circuit portion 10A is wound one or more times so that the end portions 4Aa and 4Aa overlap in the width direction. Similarly, the second short-circuit superconducting wire 5A of the second short-circuit portion 11A is wound one or more times so that the end portions 5Aa and 5Aa overlap in the width direction.
In this way, the first and second short-circuit superconducting wires 4A and 5A are wound one or more times, and the superconducting wires 2 of the first wire layer 6 and the superconducting wires 3 of the second wire layer 7 are reliably short-circuited. May be. Further, the first and second short-circuited superconducting wires 4A and 5A may be wound twice and three times to more reliably perform a short circuit.

Second Embodiment
In FIG. 3, the short circuit structure 14 of the superconducting wire 13 as 2nd Embodiment is shown.
The short-circuit structure 14 has a plurality of tape-shaped superconducting wires 13 arranged in parallel, and a short-circuit superconducting wire 12 arranged across a direction orthogonal to these superconducting wires 13. The plurality of superconducting wires 13 and the short-circuit superconducting wires 12 are joined by solder 8.

  As the superconducting wire 13 and the short-circuit superconducting wire 12, an RE123-based oxide superconducting wire in which an alignment intermediate layer, an RE-based superconducting layer, and a stabilizing layer are formed on a metal substrate can be applied. The superconducting wire 13 and the short-circuit superconducting wire 12 are arranged with their stabilization layers facing each other, and the stabilization layers are soldered together.

In the short-circuit structure 14, since a plurality of superconducting wires 13 arranged in parallel are short-circuited by the short-circuit superconducting wire 12, a current can be allocated to the plurality of superconducting wires 13 and flowed.
By adopting such a short-circuit structure 14 for a superconducting device, for example, a current can be distributed and passed through a plurality of stacked coils at the same voltage. A superconducting current limiting device will be exemplified as a superconducting device, and such a structure will be described with reference to FIG.

FIG. 4 shows a superconducting fault current limiter 99 having a short-circuit structure 14.
The superconducting current limiting device 99 has a superconducting current limiting device module 90. The superconducting fault current limiter module 90 has a structure in which a superconducting coil 90 </ b> A in which a plurality of superconducting wires 13 are wound around a coil core 15 is laminated.
The superconducting fault current limiter module 90 is stored in a liquid nitrogen container 95 filled with liquid nitrogen 98. Further, the liquid nitrogen container 95 is stored inside a vacuum container 96 that blocks heat from the outside. The liquid nitrogen container 95 has a liquid nitrogen filling part 91 and a refrigerator 93 in the upper part, and a heat anchor 92 and a hot plate 97 are provided below the refrigerator 93.

The superconducting fault current limiter 99 has current lead portions 94A and 94B for connection to an external power source (not shown). On the outer peripheral side of the superconducting current limiter module 90, the outer peripheral end of the superconducting wire 13 of the plurality of superconducting coils 90A is connected to the terminal 94a of the current lead portion 94A. In addition, on the inner peripheral side of the superconducting current limiter module 90, the inner peripheral end of the superconducting wire 13 of the plurality of superconducting coils 90A is connected to the terminal 94b of the current lead portion 94B. As a result, a plurality of superconducting coils 90A constituting the superconducting fault current limiter module 90 are connected in parallel between the current lead portions 94A and 94B.
The short-circuit superconducting wire 12 is connected so as to bridge the superconducting wire 13 of each superconducting coil 90A wound in parallel around the coil core 15, and constitutes the short-circuit structure 14 shown in FIG.
The current supplied from the current lead portion 94A flows to the short-circuit superconducting wire 12 via the terminal 94a and is equally distributed to the superconducting wire 13 wound in parallel. Therefore, a uniform current can flow through each superconducting coil 90A.
The superconducting coil 90A shown in FIG. 4 can be a single pancake coil, a double pancake coil, a non-inductive coil, or the like, but is not particularly limited thereto.

  The superconducting device that can employ the short-circuit structure 14 is not limited to the superconducting fault current limiter. Any structure can be adopted as long as it is a structure in which superconducting wires are arranged in parallel and coiled, and is also applicable to SMES (Superconducting Magnetic Energy Storage).

  Each embodiment of the present invention has been described above, but each configuration and combination thereof in each embodiment is an example, and the addition, omission, replacement, and configuration of the configuration is within the scope of the present invention. Other changes are possible. Further, the present invention is not limited by the embodiment.

DESCRIPTION OF SYMBOLS 1, 9 ... Superconducting cable, 2, 3 ... Superconducting wire 4, 4A ... 1st short circuit superconducting wire, 4a, 4Aa, 5a, 5Aa ... End part 5, 5A ... 2nd short circuit superconducting wire, 6 ... 1st wire Layer, 7 ... second wire layer, 8 ... solder, 10, 10A ... first short circuit part, 11, 11A ... second short circuit part, 12 ... short circuit superconducting wire, 13 ... superconducting wire, 14 ... short circuit structure, 15 ... coil Core, 81 ... former (core material), 82 ... insulating layer, 83 ... protective layer, 84 ... insulated double tube, 85 ... cable core, 90 ... module for superconducting current limiting device, 90A ... superconducting coil, 94 ... current lead part 94a ... terminal, 99 ... superconducting current limiting device

Claims (9)

A core material,
A plurality of tape-shaped superconducting wires that form a wire layer made of a superconducting wire spirally wound on the outer peripheral side of the core material;
Have a, a short-circuit superconducting wire shorting the superconducting wires that constitute the wire layer,
The short-circuit superconducting wire is a tape-shaped superconducting cable. The superconducting cable according to claim 1, wherein the short-circuit superconducting wire has the same layer structure as the superconducting wire. The superconducting cable according to claim 1 or 2 , wherein the short-circuit superconducting wire is wound around the wire layer by one or more turns via solder. The short superconducting wires are arranged in a superconducting cable end, a superconducting cable according to claim 1-3. The superconductivity according to any one of claims 1 to 4 , wherein an interval between the short-circuit superconducting wires arranged in the longitudinal direction of the superconducting cable is equal to or less than a length at which the superconducting cable exhibits a voltage drop corresponding to 1 µV / cm. cable. Critical current value of the short superconducting wire is larger than the difference between the average value and the minimum value of the critical current value of the plurality of tape-shaped superconducting wire constituting the wire layer, any one of claims 1 to 5 The superconducting cable described in 1. A first wire layer composed of a plurality of tape-shaped first superconducting wires wound spirally around the core;
A first short-circuit superconducting wire that short-circuits the first superconducting wires;
An insulating layer provided on the outer peripheral side of the first wire layer;
A second wire layer made of a plurality of tape-like second superconducting wires wound spirally around the insulating layer;
A second short-circuited superconducting wire that short-circuits the second superconducting wires,
The superconducting cable according to any one of claims 1 to 6 , wherein the first short-circuit superconducting wire and the second short-circuiting superconducting wire are provided at different positions in the length direction of the superconducting cable. A coil core;
A plurality of tape-shaped superconducting wires that are wound in parallel and connected in parallel around the coil core,
Have a, a short-circuit superconducting wire shorting the plurality of superconducting wires to each other,
The short-circuit superconducting wire is a superconducting device having a tape shape . The superconducting device according to claim 8 , wherein the short-circuit superconducting wire has the same layer structure as the superconducting wire.

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