JPH10106364A - Superconductive apparatus and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make electric current distribution in paralleled superconductive wires uniform by selecting one or a plurality of element wires from respective element wire bundles of multiple stranded superconductive conductor, connecting the selected element wires with one element wire bundle of another multiple stranded superconductive conductor, and displacing the selected element wires. SOLUTION: In this superconductive apparatus, one superconductive element wire 9 is selected respectively from superconductive strand bundles 10a-1, 10a-2, 10a-3 of 3×3 double-stranded superconductor 15a and replaced by joining each of the selected wires with one of superconductive strand bundle 10b-1 of another double-stranded superconductor 15b. Consequently, since the magnetic bonding between superconductive strands 9, which are magnetically firmly bonded in the same superconductive strand bundle, is lowered, unbalance of electric current distribution due to stranding disorder is hardly caused. Moreover, as compared with a method using a conventional electric resistance, no heat is generated based on Joule's law, so that consumption of liquid helium can be lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting device and a method for manufacturing the same, and more particularly to a superconducting device such as a superconducting magnet suitable for use in a nuclear fusion device.

[0002]

2. Description of the Related Art FIG. 21 shows an example of a circuit including a parallel superconducting line 1 using a superconducting wire having no electric resistance. Where L
1 and L2 are the self-inductances of the respective superconducting lines 2. M12 is a mutual inductance between the superconducting lines. i1 and i2 each indicate a current. Subscripts 1, 2
Represents each superconducting line.

Now, consider the case where a constant voltage is applied from the power supply 3 to change the current. The circuit equation in this case is as shown in the following equation (10).

L1di1 / dt + M12di2 / dt = V L2di2 / dt + M12di1 / dt = V (10)

A circuit equation of an equivalent circuit of the circuit shown in FIG. 22 is modified as in the following equation (11).

(L1-M12) di1 / dt + M12 (di1 + di2) / dt = V (L2-M12) di2 / dt + M12 (di1 + di2) / dt = V (11)

In FIG. 22, the current change rate is di / dt.
, The voltage across the parallel portion (L1-M12) di
Since 1 / dt and (L2-M12) di2 / dt are the same, the ratio of the current change rate di / dt is (L1-M12)
And the reciprocal ratio of (L2-M12). That is, the current distribution of each superconducting line 2 constituting the parallel superconducting line 1 is (L1
-M12) and (L2-M12).

For example, when a superconducting coil wound by two superconducting wires is considered as a parallel superconducting line, the two superconducting wires may have different lengths or different average winding radii. Because of the difference in inductance,
Current does not flow evenly. In a superconducting coil having an inductance of 1H (Henry) wound by two superconducting wires, the difference in self-inductance of each superconducting wire is 0.001.
Although it is considered to be about 0.0001H, even such a disturbance in inductance may cause an imbalance in current distribution.

In a superconducting stranded conductor having a large current capacity, which is an example of a superconducting parallel circuit, the magnetic coupling coefficient between the superconducting wires constituting the parallel superconducting line is close to 1 and the mutual inductance M is small. Since the size is almost the same as the self-inductance L, the value of LM becomes extremely small, and even a slight variation in the self-inductance L of the superconducting wire can cause an imbalance in the current distribution.

[0010] For the above reasons, at present, the superconducting stranded conductor has a configuration in which the electric current can be freely distributed between the superconducting strands by electrically contacting the superconducting strands without providing electrical insulation. Current unbalance is prevented. However, when a superconducting magnet made of a superconducting stranded wire conductor composed of superconducting wires without electrical insulation is excited, a transverse magnetic field is applied to the superconducting stranded wire conductor, and the coupling current flowing between the superconducting wires is Is induced, a loss occurs. This loss is called coupling loss and causes problems such as increased consumption of liquid helium.

Recently, as shown in FIG. 23, as a means for making the current distribution of the superconducting twisted wire conductor uniform, a method of attaching an electric resistance 5 in series to each superconducting line 2 (referred to as "balance resistance"). There is. In this method, by providing the electric resistance 5 such that the voltage between both ends of the parallel portion becomes substantially equal to the product of the current and the resistance value of each superconducting line 2, the current distribution can be balanced by the magnitude of the resistance. (Reference: English paper S. Torii et. Al. “ANALYSI
S OF DEGRADATION IN AC SUPERCONDUCTING CABLES '' IEE
E TRANSACTIONS ON APPLIED APPLIED SUPERCONDUCTIVIT
Y, VOL.3, NO1,1993).

[0012] Further, in the autumn of 1995, the Society of Low Temperature Engineering and Superconductivity, as shown in FIG. 24, as shown in FIG.
The idea of shorting through is proposed. Ideally, the above-mentioned coupling current circulating between the superconducting wires 9 does not occur by making the short-circuiting pitch an integral multiple of the twisting pitch (Reference literature: Outline of the 54th Autumn Meeting of Low Temperature Engineering and Superconductivity Society of Japan in 1995) Shu P192 (Yokohama National University), P19
6 (Toshiba)).

[0013]

In the above-mentioned conventional method for making the current distribution uniform, Joule heat is generated in the balance resistor portion. Therefore, such a balance resistor is disposed in a low temperature portion such as liquid helium. It is not possible. In addition, in the method of providing electric resistance to each superconducting element wire, an extra Joule loss occurs as compared with the present invention.

Further, when the current change rate is large, a sufficiently large resistance value (impedance) for improving current imbalance due to variation in inductance is provided.
Cannot be obtained, and the current distribution uniformity effect is small.

However, at present, when the superconducting wires are insulated, it is considered that a balance resistor is indispensable to realize a superconducting parallel circuit.

The method of short-circuiting between superconducting wires is also described in the case where these methods are applied to the multi-stranded superconducting conductor 15.
When manufacturing is difficult and twisting occurs, a closed circuit is formed by superconducting wires in different superconducting wire bundles through electrical contacts, and the fluctuating magnetic field created by the superconducting coil is interlinked. In such a case, there is a problem that a large circulating current is generated, which may cause a coupling loss or a quench.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has as its object to reduce the consumption of liquid helium due to Joule loss as much as possible and to easily equalize the current distribution of parallel superconducting lines. To provide a superconducting device.

[0018]

The above object is achieved according to the present invention by the following means.

According to the first aspect of the present invention, one or a plurality of superconducting wires are selected from each superconducting wire bundle of the multi-twisted superconducting conductor, and one superconducting wire bundle of another multi-twisted superconducting conductor is selected. The transposition is performed by connecting to. Thus, by weakening the magnetic coupling between the superconducting element bundles that are strongly magnetically coupled within the same superconducting element bundle, it is possible to eliminate the imbalance in the current distribution due to the twisting disorder.

According to the second aspect of the present invention, one or a plurality of superconducting wires are selected from each superconducting wire bundle of the multi-twisted superconducting conductors, and the superconducting wires are bundled and an electric resistance is attached. With this configuration, it is possible to eliminate imbalance in the current distribution between the superconducting wires.

According to the third aspect of the present invention, one or a plurality of superconducting wires are selected from each superconducting wire bundle of the multi-twisted superconducting conductors, and the superconducting wires are bundled and an inductance is attached thereto. For this reason, imbalance in the current distribution can be eliminated.

According to the fourth aspect of the present invention, the superconducting stranded conductor is provided with a pipe made of a magnetic material for one or more of the superconducting stranded conductors. As a result, the self-inductance of the superconducting element wire in that section can be increased, so that imbalance in the current distribution can be eliminated.

According to the fifth aspect of the present invention, a part of the superconducting element wire has a parallel electric resistance, whereby
When a critical current is exceeded by a certain superconducting wire at the time of occurrence of a drift, an electric resistance is automatically generated and the imbalance of the current distribution can be eliminated.

In the invention according to claim 6, a fully stabilized superconducting wire having a known critical current is provided in series with the superconducting wire, whereby when the current flowing through the superconducting wire becomes more than the critical current. Electric resistance is generated, and imbalance in current distribution can be eliminated.

In the invention according to claim 7, one or a plurality of superconducting wires are selected from each superconducting wire bundle of the multi-stranded superconducting conductor.
When the current flowing through the superconducting element wire is equal to or greater than the critical current, the imbalance of the current distribution can be eliminated because the circuit described in (1) is attached.

In the eighth aspect of the present invention, since the insulation of the superconducting wires is partially removed in the low-order twist, the current distribution of the superconducting wires in the low-order superconducting wire bundle is uniform. In other words, since the overall current distribution is relatively uniform between the higher-order twisted superconducting element bundles, the imbalance of the current distribution can be entirely eliminated. At the same time, even when a quench occurs in a certain superconducting wire, the commutation to an adjacent superconducting wire can be easily performed, so that the stability of the superconducting twisted wire conductor is improved.

According to the ninth aspect of the present invention, the operation of removing the insulating coating of the superconducting strand of the superconducting stranded wire conductor is performed in the stranded wire step. Ensures electrical contact.

According to the tenth or eleventh aspect of the present invention, the superconducting stranded wire conductor from which a part of the insulation is removed is passed through a low-melting metal bath to be bonded with a low-melting metal. By manufacturing by the above method, coupling between superconducting wires can be easily achieved.

In the twelfth aspect of the invention, after the superconducting wires are connected to each other or the superconducting wire and the electric resistance are connected to the low melting point metal, the connection portion is finished by blowing off excess low melting point metal with hot air. By manufacturing according to the method described above, no extra electrical contact occurs.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

[0031]

Embodiment 1 An embodiment of the present invention will be described with reference to FIG. 3 × 3 twisted double stranded superconductor 15a
Example in which transposition is performed by selecting one superconducting wire 9 from each of the superconducting wire bundles 10a, 10b, and 10c and connecting it to one superconducting wire bundle 10a of another double-stranded superconducting conductor 15b. Is shown.

Before explaining the operation principle of this embodiment, 3 ×
The circuit equation and equation (1) when a sine wave voltage Ve- ^jω is applied to both ends of the three superconducting stranded conductors 15 will be described.

[0033]

(Equation 1)

Here, the suffix of the self-inductance L of the superconducting wire 9 is the number of the superconducting wire 9, and the suffix of the mutual inductance M, m between the superconducting wires 9 is before the superconducting wire 9.
, And the number after it indicates the number of the superconducting element wire 9 to be magnetically coupled. The superconducting wires 9 of numbers 1, 2, 3, 4, 5, 6 and 7, 8, 9 constitute different superconducting wire bundles 10, respectively.

The impedance matrix of the 3 × 3 superconducting stranded conductor 15 is obtained by adding -j to the inductance matrix.
Multiplied by ω. In this impedance matrix, since the superconducting wires 9 constituting the primary twisted superconducting wire bundle 10 have a small geometric distance, magnetic coupling is large, and the mutual inductance M between the superconducting wires 9 is almost equal to that of the superconducting wires 9. It becomes equal to the self-inductance L of itself. Next, since the mutual inductance m between the two superconducting wires 9 in the different superconducting wire bundles 10 is geometrically large, the mutual inductance m between the superconducting wires 9 belonging to the same superconducting wire bundle 10 is large. Somewhat smaller than M. A capital letter M indicates that the magnetic coupling is strong, and a small letter m indicates that the magnetic coupling is weak.

Hereinafter, an example in which the influence of twist disorder is specifically calculated will be described below. The self-inductance of the superconducting wires is 1.392 mH, the mutual inductance between the superconducting wires in the same superconducting wire bundle is 1.365 mH, the mutual inductance between the superconducting wires in different superconducting wire bundles is 1.255 mH, and the twisting is performed. Due to the disturbance, the self-inductance of one superconducting wire is a small value of 1.380 mH.
It was calculated assuming that Originally, when twisting occurs, the mutual inductance also changes, but in this calculation, only the self-inductance was changed for simplicity.
The inductance matrix is as shown in Table 1.

[0037]

[Table 1]

FIG. 25 shows a current distribution when an AC voltage is applied to both ends of such a superconducting stranded conductor.

It can be seen that a large current is flowing through the superconducting wire (No. 1) in the superconducting wire bundle given a small self-inductance. On the other hand, when comparing the three superconducting element bundles, the current balance (comparing the sum of the currents flowing through the three superconducting element wires) is maintained.

As described above, when the superconducting wires 9 are twisted and disordered, the current distribution among the superconducting wires 9 tends to be unbalanced in the three superconducting wires 9 constituting the primary twist. On the other hand, since the electromagnetic center line of superconducting element bundle 10 is relatively far away, the current distribution between superconducting element bundles 10 is unlikely to be unbalanced.

The operation principle of this embodiment will be described.

The transposition as shown in FIG. 1 is performed on the two 3 × 3 twisted superconducting conductors 15a and 15b. Equation (2) shows a circuit equation when a sine wave voltage V ^ej ω is applied to such a 3 × 3 twisted superconductor. ω is the angular velocity, ω = frequency f × 2π.

[0043]

(Equation 2)

The superconducting wires 9 which were strongly magnetically coupled in the first term of the above equation (2) have a small magnetic coupling in the matrix of the second term. Unbalance is less likely to occur.

An example in which a specific calculation is performed in the same manner as described above will be described. This figure shows a case where two 3 × 3 twisted superconducting conductors 15 are connected by transposition assuming the above-mentioned twist disorder. The inductance matrix corresponding to the first term of Equation 2 was calculated by substituting the same numerical values as in Table 1, and the inductance matrix corresponding to the second term by substituting the numerical values of Table 2.

[0046]

[Table 2]

FIG. 26 shows a current distribution when an AC voltage is applied. It can be seen that the imbalance of the current distribution is reduced as compared with FIG.

In the present embodiment, since no Joule heat is generated, the consumption of liquid helium can be reduced as compared with the conventional method of equalizing the current distribution using electric resistance.

[0049]

Embodiment 2 A second embodiment of the present invention will be described with reference to FIG. One superconducting element wire 9 is selected from each superconducting element bundle 10 of the 3 × 3 stranded superconducting conductor 15, bundled and the electric resistance 5 is attached. 3x with such a configuration
Equation (3) shows a circuit equation when a sine wave voltage Ve ^-j ω is applied to the three-stranded superconducting conductor 15.

[0050]

(Equation 3)

Due to the effect of the matrix of the second term of the above equation (3), the superconducting wires 9 constituting the same superconducting wire bundle 10
A uniform current distribution can be realized. As compared with the case where the electric resistances are connected one by one, the number of the connection portions 7 can be reduced, so that the manufacture becomes easy.

[0052]

Embodiment 3 A third embodiment of the present invention will be described with reference to FIG. The state where the electric resistance 5 is attached to the power lead 16 is shown. 12 is a superconducting coil, 1
3 is a liquid helium, 14 is a cryostat. With the above configuration, Joule heat is generated in gas helium, so that consumption of liquid helium 13 can be reduced.

[0053]

Embodiment 4 A fourth embodiment of the present invention will be described with reference to FIG. A coil 17 is formed by selecting one superconducting wire 9 from each superconducting wire bundle 10 of the 3 × 3 stranded superconducting conductor 15 and bundling and winding them.

The following equation (4) shows that the 3 × 3 stranded superconductor 15
^Shows a circuit equation when a sine wave voltage Ve ^-j ω is applied to the circuit.

[0055]

(Equation 4)

In the matrix of the second term of the above equation (4), 1 is the self-inductance of the superconducting wire in the coil 17, and m is the mutual inductance between the superconducting wires in the coil 17. In Equation 4, it is assumed that superconducting wires constituting another coil are not magnetically coupled to each other, and the mutual inductance is zero. Due to the effect of the matrix of the second term, uniformity of current distribution can be realized also in each superconducting wire 9 constituting superconducting wire bundle 10.

According to this method, since the superconducting wires 9 are not connected, Joule loss can be reduced.

[0058]

Embodiment 5 A fifth embodiment of the present invention will be described with reference to FIG. A coil 17 is formed by selecting one superconducting wire 9 from each superconducting wire bundle 10 of the 3 × 3 stranded superconducting conductor 15 and bundling and winding them. Further, the coil 17 includes the magnetic circuit 4. In such a case, the value of the second term in the above equation (4) becomes large, and the effect of current uniformization is great.

[0059]

[Embodiment 6] A sixth embodiment of the present invention will be described with reference to FIG. One superconducting element wire 9 is selected from each superconducting element bundle 10 of the 3 × 3 stranded superconducting conductor 15, bundled and a magnetic pipe 18 is attached. The superconducting wire 9 in the magnetic pipe 18 has a large self-inductance and a large mutual inductance between the superconducting wires 9, so that the above-described fourth or fifth embodiment is used.
With the same principle as described above, the current distribution can be made uniform. At the same time, it is only necessary to pass the superconducting wire bundle 10 through the magnetic pipe 18, so that manufacture is easy.

[0060]

Seventh Embodiment A seventh embodiment of the present invention will be described with reference to FIG. One superconducting element wire 9 is selected from each superconducting element bundle 10 of the 3 × 3 stranded superconducting conductor 15, and a magnetic sheet 19 is provided around a bundle of these. With the above configuration, the magnetic sheet 19 can be easily applied even after the connection of the superconducting wires 9 is completed.

[0061]

Embodiment 8 An eighth embodiment of the present invention will be described with reference to FIG. A coil 17 is formed by selecting one superconducting wire 9 from each superconducting wire bundle 10 of the 3 × 3 stranded superconducting conductor 15 and bundling and winding them. Here, the coils 17 are in directions in which they are hardly magnetically coupled to each other. If the distance between the coils 17 is arranged,
It goes without saying that a similar effect can be obtained even if a magnetic shield is attached.

[0062]

Embodiment 9 A ninth embodiment of the present invention will be described with reference to FIG. By providing the magnetic pipe 18 for each superconducting strand 9 in a part of the superconducting stranded conductor 8, the self-inductance of the superconducting strand 9 increases. The sine wave voltage Ve-jω is applied to the 3 × 3 twisted superconducting conductor 15 having the magnetic pipe 18 as described above. Equation 5 shows a circuit equation in the case where is applied. This indicates that the effect of the provision of the magnetic pipe 18 increases the self-inductance of the superconducting wire 9 in this section by one in the matrix of the second term. The uniformity of the current distribution can be realized by the effect of the second term.

[0063]

(Equation 5)

[0064]

Embodiment 10 FIG. 1 shows a tenth embodiment of the present invention.
0 will be described. In this embodiment, a magnetic sheet 19 is used instead of the magnetic pipe 18 of the ninth embodiment.
Is used. With the above configuration, the same effects as those of the ninth embodiment can be obtained, and at the same time, the manufacturing becomes easy.

[0065]

Embodiment 11 FIG. 1 shows an eleventh embodiment of the present invention.
This will be described with reference to FIG. In the present embodiment, an example is shown in which a tubular magnetic body 20 having an opening in the longitudinal direction is applied instead of the magnetic pipe 18 of the ninth embodiment. Since the labor for passing the superconducting wires 9 can be omitted, it can be easily manufactured. If the magnetic plug 21 is provided, the self-inductance of the superconducting wire 9 is further increased.

It is needless to say that the same effect can be obtained by applying the tubular magnetic body 20 having an opening in the longitudinal direction instead of the magnetic pipe 18 in the sixth embodiment.

[0067]

Embodiment 12 FIG. 1 shows a twelfth embodiment of the present invention.
This will be described with reference to FIG. In the figure, reference numeral 22 denotes a superconducting wire whose critical current is smaller than the critical current of the superconducting element wire 9. When the current flowing through the superconducting wire 9 exceeds the critical current of the superconducting wire 22 with a known critical current, normal conduction occurs in the superconducting wire 22 with a known critical current. At this time, since the current is shunted to the electric resistance 5 in parallel, the normal conduction region is not expanded by the quench, and a certain amount of electric resistance is generated. As a result, when a current imbalance occurs, a normal conduction resistance is automatically generated, and the current distribution is balanced.

By adopting the above configuration, compared with the method of connecting the electric resistance 5 to all the superconducting wires 9 shown in the prior art, the current distribution unbalance can be reduced without generating extra Joule heat. Can be suppressed.

[0069]

Embodiment 13 A thirteenth embodiment of the present invention will be described with reference to FIG.
3 will be described. In the figure, 22 is a superconducting wire whose critical current is known. A heat sink 24 is provided so that the quench does not widen the normal conduction region. Similar to the twelfth embodiment, there is an effect of making the current distribution uniform. At the same time, since the heat sink 24 is provided, the quench does not spread to the superconducting stranded wire conductor 8.

[0070]

Embodiment 14 FIG. 1 shows a fourteenth embodiment of the present invention.
This will be described with reference to FIG. In the figure, 23 is a fully stabilized superconducting wire whose critical current is known. According to the same principle as in the thirteenth embodiment, an effect of equalizing the current distribution can be obtained. Further, in the completely stabilized superconducting wire 23, the quench does not occur, so that the superconducting device can be easily designed.

[0071]

Embodiment 15 A fifteenth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In the 3 × 3 superconducting twisted conductor 15, a critical current known fully stabilized superconducting wire 23 is attached in series to a bundle of three superconducting wires 9 selected one by one from the superconducting wire bundle 10. An example is shown. The sum of the current values of the three superconducting wires 9 connected to one completely stabilized superconducting wire 23 is
When the critical current exceeds the critical current, electric resistance is generated, so that the current distribution can be made uniform, as in the second embodiment.

[0072]

Embodiment 16 FIG. 1 shows a sixteenth embodiment of the present invention.
This will be described with reference to FIG. In the first embodiment, as described using the above equation (1), the overall current distribution between the superconducting wire bundles 10 tends to be more uniform than the current distribution between the superconducting wires 9. Similarly, in the case of a superconducting multiple stranded wire, the current imbalance between the superconducting wires is more likely to occur in a superconducting wire bundle of a lower twist.

In this embodiment, the 3 × 3 stranded superconductor 15
, The primary twist superconducting element bundle 29 which is a low-order twist
Only an example is shown in which electrical contact is made at a location 25 where the electrical insulating coating 31 is removed in a certain section.

With the above configuration, the current distribution becomes uniform, and the commutation of the current is easy even when normal conduction occurs in a certain superconducting element wire. Further, since the connection between the superconducting wires 9 is performed only in the low-order twist, the superconducting wires 9 can be reliably and easily electrically connected to each other even in a multi-stranded superconducting conductor.

Further, even in a multi-stranded superconducting conductor composed of superconducting wires whose surface is coated with a high electric resistance, for example, chromium plating, the superconducting wires forming a low-order twist using a low-melting-point metal can be used. Needless to say, the same effect can be obtained by contacting with low electric resistance.

[0076]

Embodiment 17 A seventeenth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. An example is shown in which the insulating coating 31 is removed by sandblasting at the time of a stranded wire operation using the stranded wire device 32. By such a manufacturing method, contact between superconducting wires 9 can be easily and accurately realized.

[0077]

Embodiment 18 FIG. 1 shows an eighteenth embodiment of the present invention.
8 will be described. The superconducting stranded conductor 8 is passed through a low melting metal bath 28. At this time, the melting point of the low melting point metal 27 is lower than the heat resistant temperature of the insulating coating 31. The connection between the superconducting wires 9 can be easily manufactured by the above manufacturing method. Furthermore, since the electrical connection is ensured, the conductor design becomes easier as compared with a case where the superconducting wires 9 are simply brought into contact. In addition, since the movement of superconducting element wire 9 is reduced by connecting with low melting point metal 27, quenching is less likely to occur.

[0078]

Embodiment 19 FIG. 1 shows a nineteenth embodiment of the present invention.
This will be described with reference to FIG. For example, as described in Example 1 above,
The case where the superconducting stranded wire conductors 15 are connected to each other is shown. In the figure, the wind is hot air, and 27 is a low melting point metal. By blowing the hot air after connecting the superconducting wires 9 to each other, no extra connecting portion is generated, so that the current can be made uniform as designed.

Needless to say, this is also effective when the electric resistance 5 is connected to the superconducting element wire 9.

[0080]

Embodiment 20 FIG. 2 shows a twentieth embodiment of the present invention.
0 will be described. FIG. 20 shows an example in which the present invention is applied to a superconducting cable 30. Superconducting cable 3
A value of 0 is easier to design for uniforming the current distribution because it is not wound and only the self-magnetic field needs to be considered, as compared to the case of a superconducting coil. In addition, because of the large degree of spatial freedom, a separate cryostat 1
It is easy to provide 4. Incidentally, it is needless to say that a predetermined effect can be obtained even when the means of claim 2 or later is applied.

[0081]

As described above, according to the present invention,
There is an effect that the current distribution of the parallel superconducting line, particularly the multi-stranded superconducting conductor, can be made uniform.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a superconducting device according to a first embodiment of the present invention.

FIG. 2 is a schematic view illustrating a superconducting device according to a second embodiment of the present invention.

FIG. 3 is a schematic view illustrating a superconducting device according to a third embodiment of the present invention.

FIG. 4 is a schematic view illustrating a superconducting device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic view illustrating a superconducting device according to a fifth embodiment of the present invention.

FIG. 6 is a schematic view illustrating a superconducting device according to a sixth embodiment of the present invention.

FIG. 7 is a schematic view illustrating a superconducting device according to a seventh embodiment of the present invention.

FIG. 8 is a schematic view illustrating a superconducting device according to an eighth embodiment of the present invention.

FIG. 9 is a schematic view illustrating a superconducting device according to a ninth embodiment of the present invention.

FIG. 10 is a schematic diagram illustrating a superconducting device according to a tenth embodiment of the present invention.

FIG. 11 is a schematic view showing a superconducting device according to Embodiment 11 of the present invention.

FIG. 12 is a schematic view illustrating a superconducting device according to a twelfth embodiment of the present invention.

FIG. 13 is a schematic view showing a superconducting device according to Embodiment 13 of the present invention.

FIG. 14 is a schematic diagram showing a superconducting device according to Embodiment 14 of the present invention.

FIG. 15 is a schematic view showing a superconducting device according to Embodiment 15 of the present invention.

FIG. 16 is a schematic diagram showing a superconducting device according to Embodiment 16 of the present invention.

FIG. 17 is a schematic diagram showing a superconducting device according to Embodiment 17 of the present invention.

FIG. 18 is a schematic diagram showing a superconducting device according to Example 18 of the present invention.

FIG. 19 is a schematic diagram showing a superconducting device according to Embodiment 19 of the present invention.

FIG. 20 is a schematic diagram illustrating a superconducting device according to a twentieth embodiment of the present invention.

FIG. 21 is a superconducting parallel circuit diagram.

FIG. 22 is a circuit diagram showing an equivalent circuit of a superconducting parallel circuit.

FIG. 23 is a circuit diagram showing a conventional example of the present invention.

FIG. 24 is a schematic view showing a conventional example of the present invention.

FIG. 25 is an example of a calculation result of a current distribution of a 3 × 3 twisted superconducting conductor having twisting disorder.

FIG. 26 is an example of a calculation result of a current distribution of the 3 × 3 stranded superconducting conductor according to the first embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Parallel superconducting line 2 Superconducting line 3 Power supply 4 Magnetic circuit 5 Electric resistance 6 Electric contact part 7 Connection part 8 Superconducting twisted conductor 9 Superconducting element wire 10 Superconducting element bundle 11 Parallel electric resistance 12 Superconducting coil 13 Liquid helium 14 Cryostat 15 3 × 3 twisted superconducting conductor 16 Power lead 17 Coil wound by bundling superconducting wires 18 Magnetic pipe 19 Magnetic sheet 20 Tubular magnetic body having an opening in the longitudinal direction 21 Magnetic plug 22 Superconducting wire whose critical current is known 23 Fully stabilized superconducting wire with a known critical current 24 Heat sink 25 Location where insulating coating is removed 26 Sand blast 27 Low melting point metal 28 Low melting point metal bath 29 Primary stranded superconducting element bundle 30 Superconducting cable 31 Insulating coating 32 Twisting wire Wind Hot air self inductor of the i current B magnetic field φ flux L ^* superconducting line Mutual inductance 1 _p1 1 primary twist twisting pitch 1 _p2 2 primary twist twisting pitch between chest M ^** superconducting line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazutake Senoo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Masao Morita 2- 2-3 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (12)

[Claims] 1. A superconducting wire constituting one superconducting wire bundle of another multi-twisted superconducting conductor by selecting one or a plurality of superconducting wires from each superconducting wire bundle of a multi-twisted superconducting conductor. A superconducting device characterized by being connected and transposed. 2. A multi-twisted superconducting conductor, wherein one or more superconducting wires are selected and bundled from each superconducting wire bundle, and a resistance element is connected in series. Superconducting device. 3. The multi-twisted superconducting conductor, wherein one or more superconducting wires are selected and bundled from each superconducting wire bundle, and an inductance element is connected in series. Superconducting device. 4. A superconducting stranded wire conductor comprising a tubular magnetic body for every one or a plurality of superconducting element wires in a part, and the one or more superconducting elements in a range provided with the tubular magnetic substance. A superconducting device characterized in that the wire has a large self-inductance. 5. A superconducting wire having a predetermined critical current with respect to the parallel superconducting line and having a smaller critical current than one or more superconducting wires constituting the parallel superconducting line. Alternatively, the superconducting device is provided in series with a plurality of the superconducting wires, and an electric resistance is provided in parallel with the superconducting wire whose critical current is known. 6. One or more fully-stabilized superconducting wires whose critical current is known and which is smaller than the critical current of one or more superconducting wires constituting the parallel superconducting lines are provided for the parallel superconducting lines. Wherein the superconducting wires are provided in series with each other. 7. One or more superconducting wires of a multi-twisted superconducting conductor are selected from each superconducting wire bundle, and the bundle is provided with a superconducting wire having a known critical current in series. A superconducting device, characterized in that: 8. A superconducting device in which a superconducting strand of a superconducting stranded wire conductor is partially removed and a portion of which is electrically in contact with an adjacent superconducting wire, wherein the insulating covering is removed and partially electrically connected. A superconducting device characterized in that the contacting portion is provided only in the low-order twisted superconducting element bundle. 9. In a superconducting device in which a superconducting strand of a superconducting stranded wire is partially removed and the portion is electrically in contact with an adjacent superconducting strand, the insulating covering is removed in a stranded wire manufacturing process. A method of manufacturing a superconducting device. 10. A portion of a superconducting twisted wire conductor in which a part of an insulating coating of a superconducting element wire is removed, and that part is electrically in contact with an adjacent superconducting element wire, and the insulating coating is removed to make a partial electric contact. The method of manufacturing a superconducting device provided only in a low-twisted superconducting element wire bundle, wherein the portion where the insulating coating is removed by passing the superconducting wire through a low melting metal bath whose melting point is lower than the heat resistant temperature of the insulating coating is low melting point. A method for manufacturing a superconducting device, wherein the superconducting device is joined by a metal. 11. A superconducting superconducting stranded wire conductor, wherein a part of an insulating coating of a superconducting element wire is removed, and the part is electrically contacted with an adjacent superconducting element wire to remove the insulating coating in a stranded wire manufacturing process. A superconducting device, characterized in that a portion where the insulating coating is removed by passing the superconducting wire through a low-melting metal bath whose melting point is not higher than the heat-resistant temperature of the insulating coating is joined by the low-melting metal. Manufacturing method. 12. When superconducting wires or superconducting wire bundles constituting a superconducting twisted wire conductor are connected to each other with a low melting point metal,
A method for manufacturing a superconducting device, wherein excess low melting point metal is blown off with hot air after connection.