JPH0950719A - Superconducting power cable - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a superconducting power cable capable of reducing the weight of the superconducting power cable and preventing the spacer from damaging the insulating layer and the like even when the cable is cooled. To do. SOLUTION: A superconducting power cable has a core 3 in which a flow path 2 for a coolant is formed in a central portion thereof and a plurality of grooves are formed in grooves on an outer peripheral surface, and a superconducting conductor 4 arranged in the groove. Core 3
Insulating layer 5 laminated on the outer peripheral surface of the, and a plurality of spacers 6 arranged on the outer peripheral surface of the insulating layer 5 and having a spiral shape similar to a spiral used as an oil passage of an OF cable or the like.
An inner metal cover layer 8 that covers the spacers 6, and a heat insulating layer 9, an outer metal cover layer 10, and an anticorrosion layer 11 that are sequentially stacked on the outer peripheral surface of the inner metal cover layer 8. Further, the spacer 6 may cover the peripheral surface of the EPR or rubber insulated wire with a metal braid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting electromotive force cable for reducing the weight of a spacer for forming a coolant flow path inside the superconducting electromotive force cable, and thus for reducing the weight of a cable body.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional superconducting power cable. As shown in FIG. 4, the superconducting power cable 41 has a cylindrical core 4 made of Cu or the like at the center.
3 is provided, and the inside thereof serves as a refrigerant flow path (outward path) 42. On the outer peripheral surface of the core 43, a plurality of grooves are formed spirally or linearly in the axial direction of the cable, and the superconducting conductor 44 is arranged in each groove. And the superconducting conductor 4
An insulating layer 45 is laminated on the outer peripheral surface of the core 43 in which the 4 are arranged.

Further, a spacer 46 made of a solid body of a plurality of metals (SUS etc.) is spirally or linearly provided in the axial direction of the cable on the outer peripheral surface of the insulating layer 45 so as to cover these spacers. Inside metal (aluminum, SUS
Etc.) The layer 48 is formed.

Thus, the insulating layer 45 and the inner metal coating layer 4 are
By arranging a plurality of spacers 46 between the spacers 8 and 8, a constant gap is formed, and this gap serves as a refrigerant flow path (return path) 47.

Further, a heat insulating layer 49 and an outer metal (aluminum, SUS, etc.) layer 5 are formed on the outer peripheral surface of the inner metal layer 48.
0 and the anticorrosion layer 51 are sequentially stacked.

In the superconducting power cable constructed as described above, the refrigerant is passed as follows. First, the refrigerant to which a constant pressure is applied flows into the inflow port of the outward path 42 of the cable, and the refrigerant flows in the outward path 42. And the outgoing route 42
The refrigerant that has reached the outflow port inside flows into the cable again from the inflow port of the return path 47 located at the outer peripheral portion of the outflow port,
A flow is made to flow in the return path 47 in the direction opposite to the outward path 42. afterwards,
The refrigerant that has reached the outlet of the return path 47 is reapplied to flow in the forward path 42.

As described above, the refrigerant flows through the electric power cable, the superconducting conductor 44 is cooled, and the superconducting state appears, whereby the above-mentioned electric power cable functions as a superconducting power cable.

[0008]

By the way, the wire shield used for a normal power cable has 66 to 7 wires.
With a 7 kV power cable, the diameter is 1.0 to 1.2 mm (× 4
0) is used, and for the 154, 275 and 500 kV power cables, the diameter is 1.
Those of 2, 2.0 and 2.4 mm are used.

However, the spacer used in the superconducting power cable has the same function as that of the wire shield, and also has a role of forming a refrigerant flow path for cooling the superconducting conductor, so that the refrigerant flow path is sufficiently formed. In order to ensure the above, it is necessary to set the diameter to about 10 mm. As described above, since the conventional spacer is made of a solid material such as SUS, the cable main body becomes heavy, and the spacer itself narrows the region of the refrigerant flow path. Further, when the cable is cooled, that is, when a cooling medium is passed through the cable, the spacer 46 may shrink and rub against the insulating layer 45 or the inner metal coating layer 48 shown in FIG. 4 to cause external damage.

The present invention has been made in view of the above problems, and it is possible to reduce the weight of the superconducting power cable, and to prevent the spacer from damaging the insulating layer even when the cable is cooled. An object is to provide a superconducting power cable that can be prevented.

[0011]

In a superconducting power cable according to the present invention, a plurality of spacers are linearly or spirally arranged in the axial direction, and a refrigerant flow path is provided between an insulating layer and an inner metal coating layer. In the superconducting power cable for forming, the spacer is formed in a spiral shape.

Further, the spacer may be formed by covering the peripheral surface of rubber with a metal braid. Further, the spacer may be formed by covering the peripheral surface of the rubber insulated wire with a metal braid.

[0013]

In the present invention, since the plurality of spacers, which are arranged between the insulating layer and the inner metal covering layer of the superconducting power cable and form the refrigerant flow path, have a spiral shape, the weight of the cable body can be reduced. Since it is possible to flow the refrigerant inside the spacer,
It is possible to secure a sufficient flow path for the refrigerant.

Further, as the spacer, a rubber such as ethylene propylene rubber (EPR) which does not crack even at an extremely low temperature and whose peripheral surface is covered with a metal braid is used. It is possible to electrically connect the shield layer of the cable core and the inner metal cover layer, and to reduce the weight of the spacer itself, and thus the weight of the cable body. In addition, when a rubber insulated wire is used instead of the rubber, the weight of the cable body can be similarly reduced. It is preferable to use Cu for the metal braid.

Further, since the spacer is formed in a spiral shape and a rubber and rubber insulated electric wire whose peripheral surface is covered with a metal braid, the spacer changes its shape like a spring even when the cable is cooled. It is possible to prevent the spacer from damaging the insulating layer or the like.

[0016]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. First, as a first embodiment, a superconducting electromotive force cable in which a spacer has a spiral shape will be described.

FIG. 1 is a sectional view showing a superconducting power cable according to an embodiment of the present invention. As shown in FIG.
A superconducting power cable 1 according to the present embodiment has a flow path 2 for a refrigerant formed in a central portion thereof, a core 3 having a plurality of grooves formed on an outer peripheral surface thereof, a superconducting conductor 4 arranged in the groove, An insulating layer 5 laminated on the outer peripheral surface of the core 3, and a plurality of spacers 6 arranged on the outer peripheral surface of the insulating layer 5 and having a spiral shape similar to a spiral used as an oil passage of an OF cable or the like.
An inner metal cover layer 8 that covers the spacers 6, and a heat insulating layer 9, an outer metal cover layer 10, and an anticorrosion layer 11 that are sequentially stacked on the outer peripheral surface of the inner metal cover layer 8.

FIG. 2 is an enlarged perspective view of the spacer 6 shown in FIG. As shown in FIG. 2, since the spacer of the superconducting electromotive force cable has a spiral shape, the weight of the spacer itself can be reduced, which in turn can reduce the weight of the superconducting electromotive force cable body.

Further, when the spacer is formed in a spiral shape, the coolant can flow not only to the outside of the spacer 6 but also to the inside thereof, so that a sufficient flow path of the coolant for cooling the superconducting conductor 4 can be secured. .

Next, as a second embodiment, the spacer is
A superconducting electromotive force cable formed by covering the peripheral surface of rubber with a metal braid will be described. FIG. 3 is a perspective view showing a spacer in the superconducting power cable according to this embodiment. As shown in FIG. 3, the spacer 36 is formed by covering the peripheral surface of ethylene propylene rubber (EPR) 37 with a metal braid 38. The structure of the superconducting power cable according to the present embodiment other than the spacer is the same as that of the first embodiment described above.

As described above, since the spacer is formed mainly of lightweight rubber that does not crack even during cooling, the spacer itself is reduced in weight, and in turn, the weight of the superconducting power cable body is reduced. be able to.

Further, since the peripheral surface of the rubber 37 is covered with the metal braid 38, the strength of the spacer 36 can be maintained above a predetermined level, and since the spacer as a whole has flexibility, it is insulated even during cooling. It is possible to prevent damage to the layer and the inner metal coating.

Further, a spacer is used as EPR37 shown in FIG.
Even if a rubber insulated wire is used instead of and the peripheral surface thereof is covered with a metal braid, the same effect as described above can be obtained.

[0024]

As described above, according to the present invention,
By making the spacer of the superconducting power cable a rubber or rubber insulated wire covered with a spiral shape or a metal braid, it is possible to reduce the weight of the superconducting power cable while ensuring the electrical and mechanical characteristics of the superconducting power cable. . In addition, it is possible to secure a coolant flow path that can sufficiently cool the superconducting conductor in the superconducting power cable. Further, it is possible to prevent the spacer from damaging the insulating layer and the inner metal coating layer.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing an example of a spacer in the superconducting power cable according to the embodiment of the present invention.

FIG. 3 is a perspective view showing an example of a spacer in the superconducting power cable according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional superconducting power cable.

[Explanation of symbols]

 1, 41; superconducting power cable 2, 7, 42, 47; refrigerant flow path 3, 43; core 4, 44; superconducting conductor 5, 45; insulating layer 6, 36, 46; spacer 8, 48; inner metal (aluminum) , SUS, etc.) Layer 9,49; Thermal insulation layer 10, 50; Outer metal (aluminum, SUS, etc.) layer 11, 51; Anticorrosion layer 37; EPR 38; Metal braid

Claims (3)

[Claims] 1. A superconducting electromotive force cable in which a plurality of spacers are linearly or spirally arranged in an axial direction thereof to form a refrigerant flow path between an insulating layer and an inner metal coating layer, the spacers having a spiral shape. Superconducting power cable characterized by being formed in. 2. In a superconducting power cable in which a plurality of spacers are linearly or spirally arranged in the axial direction to form a refrigerant flow path between an insulating layer and an inner metal coating layer, the spacers are made of rubber. A superconducting electromotive force cable characterized in that the peripheral surface is covered with a metal braid. 3. A superconducting electromotive force cable in which a plurality of spacers are linearly or spirally arranged in the axial direction to form a refrigerant flow path between an insulating layer and an inner metal coating layer, wherein the spacers are rubber-insulated. A superconducting power cable, characterized in that the peripheral surface of an electric wire is covered with a metal braid.