JPH103825A - Super conducting bus line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high electrical insulating performance, and to prevent the generation of return to the ordinary conductive condition for stabilization by arranging a radiation shield and conduits, in which superconducting wires are respectively inserted, inside an outer cylinder. SOLUTION: An outer cylinder 5 as a vacuum pipeline for vacuum insulating is arranged outside of a radiation shield 4. Besides the shield 4, conduits 6, in which a superconducting wire 1 is respectively inserted, are arranged in the cylinder 5. With this structure, the whole of a device is miniaturized, and a space for installation can be reduced. Since a load at the time of installation or use can be received by the outer cylinder 5, application of an excessive load to the wire 1 can be prevented. Furthermore, the insulating material 2 is wound around the outer surface of each conduit 6 for electrical insulation, generation of vacuum atmosphere in the material 2 is prevented, and high electrical insulating performance can be maintained. Four wires 1 as a group are concentrically arranged, and the direction for flowing current is switched each other so as to lower the strength of a magnetic field to be applied to the wire 1, and the stabilized superconducting condition can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting bus line for transporting electric power used for, for example, a nuclear fusion device or a superconducting energy storage device, and in particular, has a high electric insulation performance and is stable and hard to return to a normal conduction state. It relates to a superconducting bus line.

[0002]

2. Description of the Related Art Generally, for example, in a nuclear fusion device or a superconducting energy storage device, it is possible to efficiently generate or store energy by using a superconducting coil to reduce the generation loss of the device itself. For that purpose, it is necessary to make the power transmission line superconductive.

Therefore, recently, a superconducting bus line using a superconducting wire has been proposed, and its application examples have been increasing. FIG. 5 is a cross-sectional view showing a configuration example of such a conventional superconducting bus line.

[0005] In FIG. 5, reference numeral 1 denotes superconducting wires in which a pair of two superconducting wires flow in opposite directions to each other, and the superconducting wires 1 are electrically insulated from each other by an insulating material 2.
The superconducting wire 1 and the insulating material 2 are made of a liquid helium tube 3
And the liquid helium tube 3 is supplied with liquid helium to cool the superconducting wire 1.

Further, a radiation shield 4 for preventing heat radiation from the outside is disposed outside the liquid helium tube 3, and an outer cylinder for performing vacuum insulation is provided outside the radiation shield 4. 5 are arranged.

As described above, inside the liquid helium tube 3,
The superconducting wire 1 is caused to flow so that the superconducting wire 1 is in a superconducting state, and superconducting power transmission is performed. By the way, in such a superconducting bus line, liquid helium may be gasified due to heat penetration, heat generation of the superconducting wire, or the like. And because gas helium has very low withstand voltage characteristics,
If gas helium is present during energization, a short circuit may occur. The superconducting wire 1 tends to return from the superconducting state to the normal conducting state as the strength of the magnetic field increases, and it is necessary to reduce the magnetic field generated by energization.

[0007]

As described above, the conventional superconducting bus line has problems that the electric insulation performance is low and that the superconducting state easily returns from the superconducting state to the normal conducting state. An object of the present invention is to provide a stable superconducting bus line having high electric insulation performance and hardly returning to a normal conducting state.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a superconducting bus line used for transporting electric power includes a superconducting wire,
A conduit with a superconducting wire inserted inside, a radiation shield provided outside the conduit to prevent heat radiation from outside, and an outer cylinder provided outside the radiation shield to provide vacuum insulation And comprising.

Therefore, in the superconducting bus line according to the first aspect of the present invention, since the radiation shield and the conduit containing the superconducting wire are arranged in the outer cylinder, the whole becomes compact and the installation space is reduced. The superconducting wire is not subjected to an excessive load because the outer cylinder can receive the load during installation and use.

On the other hand, according to the invention corresponding to claim 2, in the superconducting bus line according to the invention corresponding to claim 1,
An insulating material is wound around the outer surface of the conduit. Therefore, in the superconducting bus line according to the second aspect of the invention, besides being able to achieve the same operation as the superconducting bus line according to the first aspect of the present invention, an electric insulating material is wound around the outer surface of the conduit. Is performed, the insulating material does not become a vacuum atmosphere, so that high electrical insulation performance can be maintained.

According to a third aspect of the present invention, in the superconducting bus line according to the first aspect,
A plurality of superconducting wires are arranged as one set, and are arranged so that the directions in which current flows are alternately opposite.

Therefore, in the superconducting bus line according to the third aspect of the present invention, the same effect as the superconducting bus line according to the first aspect of the present invention can be obtained. By alternately changing the direction in which the current flows, the strength of the magnetic field applied to each superconducting wire can be reduced, so that a stable superconducting state can be maintained.

Further, in the invention corresponding to claim 4, in the superconducting bus line of the invention corresponding to claim 1, the conduit, the radiation shield, and the outer cylinder are made of flexible piping.

Therefore, in the superconducting bus line according to the fourth aspect of the present invention, the conduit, the radiation shield, and the outer cylinder can be provided with the same function as the superconducting bus line of the first aspect of the present invention. By using a flexible pipe, flexibility can be provided, so that selection of an installation position and installation work can be facilitated.

Further, in the invention according to claim 5, in the superconducting bus line according to the invention according to claim 1, supercritical pressure helium is caused to flow inside the conduit to cool the superconducting wire.

Therefore, in the superconducting bus line according to the fifth aspect of the present invention, in addition to having the same effect as the superconducting bus line according to the first aspect of the present invention, by using supercritical pressure helium. The operation can be performed with a small pressure loss, and a small liquefier can be used.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a partial perspective view showing a configuration example of a superconducting bus line according to the present embodiment. FIG. 2 is a cross-sectional view showing a configuration example of the superconducting bus line. Are shown.

That is, in the superconducting bus line of this embodiment, as shown in FIG. 1, a superconducting wire 1 is inserted into a conduit 6, and supercritical pressure helium is flowed into the conduit 6 so that the superconducting wire is 1 is to be cooled.

The insulating material 2 is provided on the outer surface of the conduit 6.
Is wound around each of the conduits 6 for electrical insulation. Further, a radiation shield 4 for preventing heat radiation from the outside is provided outside each of the conduits 6.

Further, outside the radiation shield 4,
An outer cylinder 5 as a vacuum pipe for performing vacuum insulation is provided. Here, the superconducting wire 1 is, as shown in FIG.
Four concentric circles are arranged, and these four are arranged as a set so that the direction of current flow is alternately opposite.

Next, in the superconducting bus line of the present embodiment configured as described above, the radiation shield 4 and the conduit 6 containing the superconducting wire 1 are disposed in the outer cylinder 5 so that the whole is compact. In addition, the installation space can be reduced, and the load at the time of installation and use can be received by the outer cylinder, so that an unreasonable load is not applied to the superconducting wire 1.

Further, since the insulating material 2 is wound around the outer surface of the conduit 6 to provide electrical insulation, the insulating material 2
Does not become a vacuum atmosphere, so that high electrical insulation performance can be maintained.

Further, the superconducting wires 1 are arranged concentrically as a set of four wires, and the direction of current flow is alternately opposite, so that the strength of the magnetic field applied to each superconducting wire 1 can be reduced as compared with the prior art. Since it can be reduced to about one-fourth, a stable superconducting state can be maintained.

Further, since supercritical helium is used, operation can be performed with a small pressure loss, and a small liquefier can be used. As described above, in the superconducting bus line of the present embodiment, the superconducting wire 1 is inserted into the inside of the conduit 6, supercritical pressure helium flows through the inside of the conduit 6 to cool the superconducting wire 1, and the outer surface of the conduit 6 The insulating material 2 is wound around each conduit 6
And a radiation shield 4 for preventing heat radiation from the outside is provided outside each of the conduits 6.
An outer cylinder 5 is provided outside the radiation shield 4 as a vacuum pipe for performing vacuum insulation, and the superconducting wire 1 is further provided.
Are arranged concentrically so that the direction in which the current flows is alternately opposite to each other.

Therefore, the following various effects can be obtained. (A) Since the radiation shield 4 and the conduit 6 containing the superconducting wire 1 are disposed in the outer cylinder 5, the whole can be made compact and the installation space can be reduced. Since the load can be received by the outer cylinder, it is possible to prevent an unreasonable load from being applied to superconducting wire 1.

(B) Since the insulating material 2 is wound around the outer surface of the conduit 6 to provide electrical insulation, the insulating material 2 does not become a helium gas atmosphere, so that high electrical insulating performance can be maintained. Becomes

(C) The superconducting wires 1 are arranged concentrically as a set of four wires, and the direction of current flow is alternately opposite. Therefore, the strength of the magnetic field applied to each superconducting wire 1 is smaller than that of the prior art. Since it can be reduced, a stable superconducting state can be maintained.

(D) Since supercritical helium is used, operation can be performed with a small pressure loss, and a small liquefier can be used. (Second Embodiment) FIG. 3 is a sectional view showing a configuration example of a superconducting bus line according to the present embodiment.
The same elements as those described above are denoted by the same reference numerals and description thereof will be omitted, and only different parts will be described here.

That is, in the superconducting bus line of the present embodiment, as shown in FIG. 3, six superconducting wires 1 are arranged concentrically, and these six wires constitute a set, and the direction in which current flows is alternately opposite. Configuration.

Therefore, in the operation of the superconducting bus line of the present embodiment configured as described above, the superconducting wire 1
By arranging concentrically as one set and alternately flowing currents in opposite directions, the magnetic field strength applied to each superconducting wire 1 can be reduced to about one sixth compared to the conventional case. Therefore, a stable superconducting state can be maintained.

When the total amount of current is constant, the amount of current per superconducting wire 1 can be reduced, so that a stable superconducting state can be maintained. (Third Embodiment) FIG. 4 is a sectional view showing a configuration example of a superconducting bus line according to the present embodiment.
The same elements as those described above are denoted by the same reference numerals and description thereof will be omitted, and only different parts will be described here.

That is, as shown in FIG. 4, the superconducting bus line of the present embodiment has a configuration in which the conduit 6, the radiation shield 4, and the outer cylinder 5 in FIGS.

Therefore, in the operation of the superconducting bus line of the present embodiment configured as described above, the conduit 6,
Since the radiation shield 4 and the outer cylinder 5 can be made flexible by using flexible piping, the installation position can be easily selected and the installation work can be facilitated.

[0034]

As described above, according to the first aspect of the present invention, in a superconducting bus line used for transporting electric power, a superconducting wire, a conduit in which the superconducting wire is inserted, and an outside of the conduit And a radiation shield for preventing heat radiation from the outside, and an outer cylinder for vacuum insulation provided outside the radiation shield. In addition, a stable superconducting bus line that does not easily return to the normal conducting state can be provided.

On the other hand, according to the invention corresponding to claim 2,
In the superconducting bus line according to the first aspect of the present invention, since an insulating material is wound around the outer surface of the conduit, a stable superconducting bus line having high electric insulation performance and hardly returning to the normal conducting state can be provided.

According to the third aspect of the present invention,
In the superconducting bus line of the invention corresponding to claim 1, since a plurality of superconducting wires are arranged as one set and the current flowing directions are alternately opposite to each other, the superconducting bus line has high electric insulation performance, In addition, a stable superconducting bus line that does not easily return to the normal conducting state can be provided.

According to a fourth aspect of the present invention, in the superconducting bus line according to the first aspect of the present invention, the conduit, the radiation shield, and the outer cylinder are made of flexible piping. Selection and installation work can be facilitated, and a stable superconducting bus line having high electric insulation performance and hardly returning to a normal conducting state can be provided.

According to a fifth aspect of the present invention, in the superconducting bus line of the first aspect of the present invention, supercritical pressure helium is flowed inside the conduit to cool the superconducting wire. It is possible to provide a stable superconducting bus line which can be operated with a small pressure loss, has high electric insulation performance, and hardly returns to a normal conducting state.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a first embodiment of a superconducting bus line according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of a superconducting bus line according to the present invention.

FIG. 3 is a sectional view showing a second embodiment of a superconducting bus line according to the present invention.

FIG. 4 is a partial perspective view showing a third embodiment of a superconducting bus line according to the present invention.

FIG. 5 is a sectional view showing a configuration example of a conventional superconducting bus line.

[Explanation of symbols]

 1: superconducting wire, 2: insulating material, 3: liquid helium tube, 4: radiation shield, 5: outer cylinder, 6: conduit.

Claims (5)

[Claims] 1. A superconducting bus line used for transporting electric power, comprising: a superconducting wire; a conduit in which the superconducting wire is inserted; and a conduit disposed outside the conduit for preventing heat radiation from the outside. A superconducting bus line, comprising: a radiation shield; and an outer cylinder disposed outside the radiation shield to perform vacuum insulation. 2. The superconducting bus line according to claim 1, wherein an insulating material is wound around an outer surface of the conduit. 3. The superconducting bus line according to claim 1, wherein a plurality of the superconducting wires are arranged as a set and the directions in which current flows are alternately opposite to each other. 4. The superconducting bus line according to claim 1, wherein the conduit, the radiation shield, and the outer cylinder are flexible pipes. 5. The superconducting bus line according to claim 1, wherein superconducting pressure helium flows inside the conduit to cool the superconducting wire.