JP3081097B2 - High temperature superconducting power cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor for a high-temperature superconducting power cable used for a high-temperature superconducting power cable and a high-temperature superconducting power cable.

[0002]

2. Description of the Related Art A conventional high-temperature superconducting power cable is shown in FIG.
As shown in the figure, a plurality of superconducting conductors 23 made of a superconducting material are spirally (or linearly) formed in the cable axial direction on the outer peripheral surface of a cylindrical former 21 as a core through which a coolant such as liquid nitrogen flows in the center. ) So as to extend. These superconducting conductors 23 have a tape shape, are densely arranged in the circumferential direction of the cable, and are laminated in, for example, two layers. Then, on these superconducting conductors 23, insulating layer 2
3 are stacked.

As shown in FIG. 6, another conventional high-temperature superconducting power cable has a groove 31a extending spirally (or linearly) in the cable axis direction on the outer peripheral surface of a former 31, and has a U-shaped cross section. A plurality of tape-shaped superconducting conductor tapes 34 are laminated in a letter-shaped case 35, and a superconducting conductor 33 comprising the superconducting conductor tape 34 and the case 35 is formed in a groove 31.
It is configured to fit inside. And Former 31
The insulating layer 32 is laminated on the peripheral surface of the substrate.

[0004]

However, in the conventional high-temperature superconducting power cable shown in FIG. 5, the tightening force of the insulating layer 22 and the layer disposed further outside thereof is reduced.
A pressing force acts on the superconducting conductor 23. There is a disadvantage that the superconducting conductor 23 is distorted due to the pressing force and the superconducting characteristics are deteriorated.

In the conventional high-temperature superconducting power cable shown in FIG. 6, the uppermost superconducting tape 34 is positioned lower than the peripheral surface of the former 31 so that no tightening force acts on the superconducting conductor 34. I have. Therefore, as shown in FIG. 7, there is a disadvantage that a step D is generated between the peripheral surface of the former 31 and the uppermost superconducting conductive tape 34, electric field concentration occurs, and electrical insulation is deteriorated. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in view of the fact that the superconducting characteristics are not degraded even when a tightening force is applied, and there is no step between the peripheral surface of the former and a high temperature. It is an object to provide a conductor for a superconducting power cable and a high-temperature superconducting power cable.

[0007]

[0008]

A high-temperature superconducting power cable according to the present invention comprises a plurality of conductor tapes provided with a high-temperature superconducting material, a metal or alloy case accommodating a plurality of the conductor tapes, and A stress relieving member housed with the conductive tape and having elasticity, a core having a groove in which the case is fitted, and an insulating layer covering the core;
And the height of the case matches the depth of the groove.
Characterized in that that.

The high-temperature superconducting power cable according to the present invention comprises:
A plurality of conductor tapes provided with a high-temperature superconducting material, a metal or alloy case accommodating a plurality of the conductor tapes, a core having a groove in which the case is fitted, and a case housed inside the groove together with the case; A stress relaxation member having a predetermined elasticity, and an insulating layer covering the core.
The height of the groove is equal to the depth of the groove .

[0010]

In the present invention, since a plurality of conductor tapes provided with the high-temperature superconducting material are housed in a metal or alloy case, no direct pressing force acts on the conductor tapes.

Further, in this case, the stress relaxing member having elasticity is housed together with the conductive tape, or the stress relaxing member is arranged between the case and the groove bottom of the core. There is no gap between the insulating layer and other layers.

As described above, the pressing force does not directly act on the conductor tape, and the stress relaxation member is disposed. Therefore, excessive stress is applied to the superconducting material by the tightening force of the insulating layer and the layers disposed outside the insulating layer. The superconducting characteristics do not deteriorate due to the action.

[0013]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a partial sectional view showing a part of a high-temperature superconducting power cable according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing the high-temperature superconducting conductor.
A spiral or linear groove 7 extending in the cable axis direction is formed on the outer peripheral surface of the cylindrical former 1 through which the refrigerant flows at the center as a core, and the superconducting conductor 3 is formed in the groove 7. They are fitted and arranged. Then, an insulating layer 2 is arranged so as to cover the former 1.

As shown in FIG. 2, the high-temperature superconducting conductor 3 has a plurality of conductive tapes 6 stacked and housed in a rectangular cylindrical metal or alloy case 5. The conductor tape 6 is obtained by covering a high-temperature superconducting material with a sheath layer made of a metal such as Ag, and the conductor tape 6 itself may have a structure similar to that of the related art. The high-temperature superconducting conductor 3 houses a stress-relaxing member 4 having elasticity at the bottom of the case 5. The above-described conductor tape 6 is laminated on the stress relaxation member 4. As the stress relaxation member 4, for example, an EP-based semiconductive rubber or the like can be used.

In the high-temperature superconducting power cable of this embodiment constructed as described above, each conductor tape 6 including the superconducting material is housed in the case 5 made of metal or alloy. Even if the pressing force acts on the superconducting conductor 3 due to the force, the pressing force does not directly act on the conductor tape 6. Further, since the stress relaxation member 4 is housed in the case 5 and is interposed between the conductor tape 6 and the inner surface of the case 5, even if the case 5 is distorted and stress tries to act on the conductor tape 6. This stress is relieved by the stress relieving member 4. Therefore, according to the present embodiment, no excessive stress acts on the conductive tape 6,
Its superconductivity does not deteriorate.

Next, another embodiment of the present invention will be described in detail with reference to FIGS. A spiral or linear groove 7 extending in the cable axis direction on the outer peripheral surface of the former 1
A superconducting conductor 13 is fitted and disposed in the groove 7. An insulating layer (see FIG. 1) is arranged so as to cover the former 1.

The superconducting conductor 13 of the present embodiment has a conductor tape 16 similar to the conductor tape 6 laminated and housed in a rectangular cylindrical case 15 made of metal or alloy. In this embodiment, only the conductor tape 16 is disposed in the case 15. In this embodiment, the stress relaxing member 14 having elasticity is disposed between the bottom of the groove 7 and the bottom of the case 15.

In this embodiment having such a configuration, when a tightening force acts on the superconducting conductor 13, the tightening force is relaxed by the stress relaxing member 14 disposed between the case 15 and the groove bottom. You. For this reason, excessive stress does not act on the conductor tape 16, and deterioration of the superconducting characteristics is prevented.

[0019]

As described above, according to the present invention,
Multiple conductor tapes are stored in a metal or alloy case,
Since a stress-relief member having elasticity is housed in the case or the stress-relief member is arranged between the case and the core groove, even when a tightening force is applied at the time of disposing the outer layer, the conductive tape is formed by the tightening force. Is prevented from acting on the superconducting material, and deterioration of the superconducting characteristics of the superconducting material is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a part of a superconducting power cable according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the superconducting conductor.

FIG. 3 is a sectional view showing a part of a superconducting power cable according to another embodiment of the present invention.

FIG. 4 is a perspective view showing the superconducting conductor.

FIG. 5 is a sectional view showing a part of a conventional high-temperature superconducting power cable.

FIG. 6 is a sectional view showing a part of another conventional high-temperature superconducting power cable.

FIG. 7 is a schematic view showing the conductor.

[Explanation of symbols]

 1, 21, 31; Former 2, Insulating layer 3, 13, 23, 33; Superconducting conductor 4, 14, Stress relaxation member 5, 15, Case 6, 16, 34;

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Riki Iwasawa 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (56) References JP-A-5-62536 (JP, A) JP-A-5-625 81941 (JP, A) JP-A-53-51487 (JP, A) JP-A-4-3477 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 12 / 00-13 / 00

Claims (2)

(57) [Claims] 1. A plurality of conductor tapes provided with a high-temperature superconducting material, a metal or alloy case accommodating a plurality of the conductor tapes, a stress relaxation member accommodated in the case together with the conductor tapes and having elasticity, A core having a groove into which the case is fitted , and an insulating layer covering the core,
A high-temperature superconducting power cable , wherein the height of the case is equal to the depth of the groove . 2. A plurality of conductive tapes having a high-temperature superconducting material, a metal or alloy case accommodating a plurality of the conductive tapes, and a core having a groove into which the case is fitted;
An elastic stress-relieving member housed together with the case inside the groove, and an insulating layer covering the core;
A high-temperature superconducting power cable , wherein the height of the case is equal to the depth of the groove .