JP3501822B2 - Oxide 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 an oxide superconducting power cable which is being applied and developed for power transportation or for superconducting magnets.

[0002]

2. Description of the Related Art Conventionally, attempts have been made to manufacture an electric power cable for electric power transportation, a superconducting magnet, or a superconducting power cable for a field winding of a superconducting generator by using an oxide superconducting conductor having a high critical temperature. . As one conventional example of such a power cable, as shown in FIG. 6, a plurality of long oxide-based superconducting conductors 1 (16 in the example of FIG. 6) are used.
There is known a superconducting power cable 3 in which a book) is fixed around a pipe 2 made of copper or the like so as to be adjacently arranged in a spiral shape. As shown in the sectional structure of FIG. 7, the superconducting conductor 1 is formed by laminating a plurality of superconducting tapes 6 formed by covering a core oxide superconducting body 4 with a sheath 5 made of silver or the like with a joining material such as solder. It will be made. In the above example, as the oxide superconductor 4, for example, a Bi-based oxide superconductor having a composition of 2223 known as a composition of Bi _1.6 Pb _0.4 Sr ₂ Ca ₂ Cu ₃ O _y is used. In the superconducting conductor 1 having the structure shown in FIG. 6, liquid nitrogen is made to flow inside the central pipe 2 as a coolant, and the liquid nitrogen cools the surrounding oxide superconductor 4.

Next, as a second example of this type of superconducting power cable, as shown in FIG. 8, an outer corrugated pipe 11 having an outer periphery covered with an anticorrosion layer 10 and the outer corrugated pipe 1 are provided.
1, a pipe-shaped heat insulation pipe 12 inserted inside 1, and an inner corrugated pipe 13 provided inside the heat insulation pipe 12.
An insulating tube 16 having a blocking layer 15 inserted into the inner corrugated tube 13 with a refrigerant return path 14 formed therein; a cooling pipe 17 provided inside the insulating tube 16; and a superconducting conductor arranged around the cooling pipe 17. A superconducting power cable 20 comprising a conductor 18 is known. In the superconducting power cable 20 shown in FIG. 8, the internal space of the cooling pipe 17 is used as an outward path for a refrigerant such as liquid nitrogen, and the refrigerant return path 14 provided outside thereof is used as a return path for the refrigerant. As a result, the refrigerant can be circulated, whereby the superconducting conductor 18 is efficiently cooled.

Furthermore, the third type of superconducting power cable of this type is used.
As an example of the above, as shown in FIG. 9, an outer pipe 20, a heat insulating material 21 and an inner pipe 22 provided inside the outer pipe 20,
The superconducting wire rods 24, 24, 24 housed inside the inner pipe 22 with the refrigerant return path 23 opened are provided.
4 is a superconducting power cable 27 which is composed of a pipe having a refrigerant outward path 25, a superconducting conductor arranged around the pipe, and an insulating layer. In the superconducting power cable 27 shown in FIG. 9, a refrigerant such as liquid nitrogen is caused to flow through the refrigerant outward path 25 and the refrigerant return path 23 so that the superconducting wire 2
4, 24, 24 are configured to be cooled.

[0005]

However, in the superconducting power cable 3 having the structure shown in FIG.
Since the indirect cooling system in which the superconducting conductor 1 outside the pipe 2 is cooled by the refrigerant supplied inside the superconducting conductor 1, the cooling efficiency of the superconducting conductor 1 is poor. When the cooling efficiency is poor as described above, there is a drawback that the effect of suppressing the superconducting conductor is reduced when the superconducting conductor tries to transition to the normal conducting state for some reason. When the superconducting power cable 3 is bent for the purpose of pulling it into a conduit and laying it, the superconducting conductor 1 is replaced by the superconducting power cable 3.
Since it is not located at the center of the, there is a problem that it is easily affected by bending strain. Furthermore, in general, in a superconducting power cable, it is necessary to adopt a method of cooling while circulating a refrigerant in order to cool the superconducting conductor efficiently.
In the above-mentioned superconducting power cable 3, since the refrigerant return passage is not provided, there is a problem that the refrigerant cannot be circulated.

Next, in the superconducting power cable 20 having the structure shown in FIG. 8, the inside of the cooling pipe 17 is used as a forward path for a refrigerant such as liquid nitrogen, and the refrigerant return path 14 is used as a return path for the refrigerant. However, even in this structure, the cooling system is an indirect cooling system in which the coolant flowing inside the cooling pipe 17 is used, and a superconducting conductor is arranged on the peripheral surface of the cooling pipe 17. Therefore, there is a problem that the characteristics of the superconducting conductor are likely to deteriorate due to bending strain.

Next, in the superconducting power cable 27 having the structure shown in FIG. 9, a large refrigerant return path 2 is provided inside the inner tube 22.
Since the superconducting wire rods 24, 24, 24 are housed at 3 apart, each superconducting wire rod 24 can move relatively freely. However, when the superconducting power cable 27 is energized, the self magnetic field is 0.1 to 0.1.
Since a magnetic field of about 2T is generated and a force due to this magnetic field acts, it is basically preferable that the superconducting wire 24 is fixed.

The present invention has been made in view of the above circumstances, in which the superconducting conductor is fixedly arranged at the center of the cable so that the strain is less added even if the bending process is performed, and the superconducting conductor is directly connected by the refrigerant. It is an object of the present invention to provide an oxide superconducting power cable in which a direct cooling system capable of cooling a superconducting conductor is provided, and an outward path and a return path of the refrigerant are secured so that the refrigerant can be circulated.

[0009]

In order to solve the above-mentioned problems, an oxide superconducting conductor having a rectangular cross section and a metal having good conductivity for accommodating and fixing the oxide superconducting conductor. A hollow stabilizing material made of a material and provided with a ridge on the outer peripheral portion, and an internal protection pipe provided outside the stabilizing material to form a refrigerant flow path between the stabilizing material, A semiconductive layer and an insulating layer coated on the outer surface of the internal protection pipe, a semiconductive layer and a superconducting shield layer coated on the outer surface of the insulating layer, and a superconducting layer provided outside the superconducting shield layer via a spacer. A second protective pipe having a refrigerant flow path formed between it and the shield layer; a heat insulating layer coated on the outer surface of the second protective pipe; a first protective pipe attached to the outer surface of the heat insulating layer; An anticorrosion layer coated on the outer surface of the first protective pipe, It is those formed by provided.

In order to solve the above-mentioned problems, the invention according to claim 2 is such that the stabilizing material according to claim 1 is formed by fitting two channel-shaped stabilizing base materials, and the outer surface of each channel material is formed. Is formed with a ridge that abuts on the outer inner protection pipe and forms a refrigerant flow path between the inner protection pipe and the inner protection pipe.

According to a third aspect of the present invention, in order to solve the above-mentioned problems, the stabilizing material according to the first aspect is communicated with a refrigerant flow path outside thereof and the inside of the stabilizing material, and a flow path of the refrigerant is provided. A plurality of through holes are formed.

In order to solve the above-mentioned problems, the invention according to claim 4 is such that the insulating layer formed on the outer surface of the inner protective pipe according to the first, second or third aspect of the present invention has an outer surface of the inner protective pipe via a semiconductive layer. And a superconducting shield layer formed on the outside of the insulating layer with a semiconductive layer interposed between the superconducting tape wound around the outer surface of the insulating layer.

[0013]

[Function] Since the oxide superconducting conductor having a rectangular cross section is fixedly housed inside the hollow stabilizer, the oxide superconducting conductor moves or vibrates due to external force such as magnetic force generated by itself during energization. There is nothing to do. Also, when bending is applied during installation, etc., by adopting an oxide superconducting conductor with a rectangular cross-section, it is possible to install without causing twisting, and unnecessary strain due to twisting does not occur. .

Since the refrigerant flow path outside the stabilizer and the refrigerant flow path outside the superconducting shield layer are provided, the refrigerant flow path outside the stabilizer is used as the outward path of the refrigerant, If the refrigerant flow path outside the shield layer is used as the return path of the refrigerant, the refrigerant can be circulated, so that the oxide superconducting conductor can be efficiently cooled, which contributes to stabilization of the superconducting characteristics. The ridge formed on the outer surface of the stabilizing material secures the refrigerant flow path between the internal protection pipe and the stabilizing material, so that the oxide superconducting conductor can be cooled by the refrigerant passing through the refrigerant flow path. Further, since the refrigerant flows into the stabilizing material through the flow holes formed in the stabilizing material, the superconducting conductor can be directly cooled by the flowing refrigerant.

Further, when the insulating layer is formed by winding the insulating tape, and the superconducting shield layer is formed by winding the superconducting tape, the refrigerant flowing in the refrigerant flow path outside the superconducting shield layer is made of the superconducting tape. It soaks into the insulating layer side through the respective gaps between the winding portion and the semiconductive layer therebelow, and further soaks into the gaps at the winding portion of the insulating tape, thus contributing to the improvement of the insulating property of the insulating layer.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of an oxide-based superconducting power cable according to the present invention. A superconducting power cable 30 of this example has an oxide superconducting conductor 31 arranged at the center thereof.
Is covered with other various members. As shown in the enlarged view of FIG. 2, the superconducting conductor 31 arranged in the central portion is formed into a rectangular cross section by laminating a plurality of superconducting tapes 32 and integrating them with a bonding material 33 such as solder. Each of the superconducting tapes 32 is made of Y-Ba-C.
u-O system, Bi-Pb-Sr-Ca-Cu-O system, Tl-Ba-
A tape body of an oxide superconductor represented by Ca-Cu-O system is covered with a sheath material made of silver or a noble metal. In the example shown in FIGS. 1 and 2, a plurality of superconducting tapes 32 are laminated to form one block conductor 3
The superconducting conductor 31 is formed by further connecting four block conductors 32A to 2A. Further, it is preferable to join the block conductors 32A so that the superconducting tapes 32 are laminated in the same direction as shown in FIG.

Next, outside the superconducting conductor 31, a hollow stabilizing material 36 is formed by fitting long channel-shaped stabilizing base materials 34 and 35 made of a highly conductive metal material such as copper.
Are provided so as to cover the superconducting conductor 31. The stabilizing base material 34 includes a central wall 37 and a side wall 3 as shown in FIG.
The cross section of the central wall 37 has a substantially U-shaped cross section and is formed of three ridges 3 along the length direction of the stabilizing base material 34.
9 are formed on the outer surface of the side wall 38, and two ridges 40 are formed along the length direction of the stabilizing base material 34. Also,
The stabilizing base material 35 has a structure similar to that of the stabilizing base material 34, and is composed of a central wall 41 and side walls 42, 42, and three ridges 43 are formed on the outer surface of the central wall 41 similarly to the ridge 39. ing. The stabilizing base material 35 has side walls 42, 4
2 is disposed inside the side walls 38, 38 of the stabilizing base material 34 and is fitted into the stabilizing base material 34 to form a hollow stabilizing material 36.
Is configured. The stabilizing base materials 34 and 35 are fitted to each other with a size about 0.1 to 0.2 mm larger than the thickness of the superconducting conductor so as not to damage the superconducting conductor 31 housed inside. With such a clearance, the superconducting conductor 31 housed inside the stabilizing material 36 is stably held inside the stabilizing material 36 so as to be hardly moved. A plurality of slits 45 are formed on the side walls 38, 38 of the stabilizing base material 34 and the side walls 42, 42 of the stabilizing base material 35 at predetermined intervals to facilitate bending, and the stabilizing base material 34 is formed. The central wall 37 of the material 34 and the central wall 41 of the stabilizing base material 35 are formed with circulation holes 46 ... Which secure the entrance and exit of the refrigerant at predetermined intervals.

An external protective pipe 47 is provided outside the stabilizing member 37 so as to surround the stabilizing member 36 in contact with the plurality of ridges 39 ... A plurality of refrigerant flow paths (refrigerant outward paths) 48 with the material 36
Are formed. The internal protection pipe 47 is made of a copper pipe, a stainless pipe, a Cu-Ni alloy pipe, or the like. A coolant such as liquid nitrogen is supplied to the coolant channel 48 from a coolant supply source (not shown), and the coolant contains the circulation holes 46 and the slits 45.
Through a portion of the stabilizing base materials 34, 35 from the outside to the inside, or from the stabilizing base materials 34, 35 to the outside. In addition,
When the superconducting power cable is used as an AC power cable, a high resistance metal tape such as a Cu-Ni (30% Ni) alloy tape is preferably separately disposed between the superconducting conductor 31 and the stabilizing material 37. . In this case, the high resistance metal tape can be arranged vertically or wound in a spiral shape.

The outer periphery of the internal protection pipe 47 is covered with an insulating layer 49 via a semiconductive layer 49a. The insulating layer 49 is formed by winding an insulating tape such as kraft paper or PPLP (polypropylene laminated paper), and is provided to ensure the dielectric strength.
Since the insulating layer 49 is formed by winding an insulating tape, the liquid nitrogen of the refrigerant flowing through the later-described refrigerant channel 54 on the outer side of the insulating layer 49 soaks into this portion and contributes to the improvement of the insulating characteristic. .

A semiconductive layer 49 is formed on the outer periphery of the insulating layer 49.
The superconducting shield layer 50 is covered via b. The superconducting shield layer 50 is made of Y-Ba-Cu-O having a thickness of about 0.1 to 1 μm on a metal tape such as Hastelloy tape.
A superconducting tape wound with a thin-film superconducting layer such as a system, or the above oxide superconducting conductor 31.
It is composed of a wound superconducting tape. Here, in order to form the superconducting layer on the metal tape, laser deposition, CVD (chemical vapor deposition), MB
A film forming method such as the E method (molecular beam epitaxy method) may be performed. In addition, a thick film having a thickness of 5 to 50 μm is applied on the metal tape by a doctor blade method and heat-treated in an oxygen stream to form a thick film superconducting layer such as a Y—Ba—Cu—O system. You may make a superconducting tape and wind it.

During this winding, it is preferable to wind the superconducting tape with the metal tape facing outward and the superconducting layer facing inward. As a result, when the superconducting power cable 30 is used for alternating current, it is possible to suppress the eddy current loss that occurs when the alternating current is used for the metal tape of the normal conducting portion,
Further, when the superconducting tape is wound, compressive strain is added to the superconducting layer, and deterioration of the superconducting characteristics can be reduced. Further, since the insulating layer 49 is provided outside the inner protective pipe 47 via the semiconductive layer 49a, the corner portion of the inner protective pipe 47 is rounded, and thereby the bending strain applied to the superconducting layer at the corner portion. Can be reduced.

Next, a spacer 52 made of stainless steel wire such as SUS304L is wound around the outside of the superconducting shield layer 50. In addition, this spacer 5
Reference numeral 2 may be ceramics such as CBN, Al ₂ O ₃ or partially stabilized zirconia, or a linear or strip body made of synthetic resin such as polytetrafluoroethylene (Teflon), polyethylene or nylon. It doesn't matter.

A second protective pipe 53 is covered outside the spacers 52 so as to contact the spacers 52, and a refrigerant flow path (refrigerant return path) is provided between the second protective pipe 53 and the superconducting shield layer 50. ) 54 are formed. The second protective pipe 53 is made of a metal material such as stainless steel or copper having a thickness of about 1.5 to 2 mm, and also serves as a ground conductor for a ground fault as described later. A heat insulating layer 55 having a thickness of about 10 to 20 mm is provided on the outside of the second protection pipe 53, and a first protection pipe 56 is covered on the outside thereof.
Further, the outer surface of the first protective pipe 56 is covered with a corrosion-proof layer 57 made of polyethylene, ethylene propylene rubber or the like.

The coolant channel 54 is a channel through which a coolant such as liquid nitrogen for cooling the superconducting conductor 31 flows, and the coolant channel 48 and the coolant channel 54 are connected at one end of the superconducting power cable 30. Then, the coolant channel 48 and the coolant channel 54 on the other end side are connected to a coolant supply source such as liquid nitrogen (not shown),
By supplying the coolant from the coolant supply source to the coolant channel 48 and returning the coolant via the coolant channel 54, the coolant can be circulated over the entire length of the superconducting power cable 30.

Next, the superconducting power cable 30 having the above structure.
The case of using will be described. In the superconducting power cable 30, the refrigerant such as liquid nitrogen is circulated through the refrigerant flow path 48 and the refrigerant flow path 54 to make the superconducting conductor 31.
Is cooled and the superconducting conductor 31 is transitioned to a superconducting state to be used for energization. In this case, when liquid nitrogen is flown into the coolant flow channel 48, the flow path 4 of the stabilizing material 36 flows from the coolant flow channel 48.
6 and a part of the slit 45, liquid nitrogen flows to the inside of the stabilizing material 36, and the liquid nitrogen directly cools the superconducting conductor 31. Therefore, the indirect cooling type superconducting power cable described in the conventional example. Better cooling efficiency. Therefore, when energized in the superconducting state, the superconducting conductor 31
The stability of is improved.

In the conventional superconducting force cable having a round cross section, the superconducting conductor may be twisted when installed, but if the cross section is rectangular like the superconducting force cable 30 of this example, the superconducting force cable may be twisted. Is eliminated, and unnecessary strain is not given to the superconducting conductor 31. Further, since the superconducting conductor 31 is arranged at the central portion of the superconducting power cable 30, the bending strain is less applied than that of the conventional superconducting force cable arranged at the outer peripheral portion, and the characteristic deterioration is less. Moreover, since the slits 45 ... Are formed in the side walls 38, 42 of the stabilizing base materials 34, 35,
The central wall 37 of the stabilizing base material 34 and the central wall 41 of the stabilizing base material 35 are both easily bendable. Further, since the stabilizing material 36 covers and holds the superconducting conductor 31 stably, the superconducting conductor 31 does not move or vibrate inside the stabilizing material 36, and has a structure strong against external force. .

Next, the insulating layer 49 is formed by winding an insulating tape around the semiconductive layer 49a, and the superconducting shield layer 50 is formed by winding a superconductive tape around the semiconductive layer 49b. Refrigerant flow path 5 outside them
The liquid nitrogen as the refrigerant flowing in 4 penetrates into the superconducting shield layer 50 inside the gap of the wound superconducting tape, and the liquid nitrogen also penetrates into the insulating layer 49.
Here, since the insulating layer 49 soaked with liquid nitrogen has an improved withstand voltage, the withstand voltage of the superconducting power cable 30 can be improved. In addition, when the superconducting power cable 30 is energized, if the superconducting conductor 31 transitions to the normal conducting state for some reason, it is necessary to temporarily release large power supplied from the power supply source. In such a case, in the superconducting power cable 30 having the above structure,
The second protective pipe 53 and the first protective pipe 56 serve as a grounding conductor for releasing the current.

The superconducting shield layer 50 has a function of repelling the magnetic field generated by the superconducting conductor 31 by the Meissner effect when the superconducting conductor 31 is energized. In particular, when an alternating magnetic field acts when an alternating current is applied, an AC loss may occur, which can be prevented by the superconducting shield layer 50.

FIG. 4 shows a second example of the stabilizing material applied to the superconducting power cable according to the present invention.
The stabilizing material 60 of this example is a stabilizing base material 6 having a U-shaped cross section.
1 and 61 are abutted against each other, and a plurality of recesses 62 are formed in the outer peripheral portion of each stabilizing base material 61 along the lengthwise direction of the stabilizing base material 61. An internal protection pipe 64 equivalent to that of the embodiment is covered, and a coolant passage 65 is formed by the recess 62 and the internal protection pipe 64.
Are formed. Although other configurations are omitted in FIG. 4, they are the same as those of the previous embodiment, and the structure of this embodiment can also obtain the same effect as that of the superconducting power cable 30 of the previous embodiment.

FIG. 5 shows a third example of the stabilizing material applied to the superconducting power cable according to the present invention. The stabilizing material 70 of this example is a stabilizing base material 7 having a U-shaped cross section.
1 and 71 are abutted against each other, and a plurality of recesses 72 and 73 are formed on the outer peripheral portion and the inner peripheral portion of each stabilizing base material 71 along the length direction of the stabilizing base material 71. Outside the 70, an internal protection pipe 74 equivalent to that of the previous embodiment.
Is covered with the recess 72 and the internal protection pipe 74.
Form a coolant channel 75, and the recess 73 and the superconducting wire 31 form a coolant channel 76. Although other configurations are omitted in FIG. 5, they are the same as those of the previous embodiment, and the structure of this embodiment can also obtain the same effect as that of the superconducting power cable 30 of the previous embodiment. In the structure of this example, since the coolant flow path 76 is separately provided, the flow path 76 can also be used to cool the superconducting conductor 31 more efficiently.

"Production Example" Bi _1.6 Pb _0.4 Sr ₂ Ca ₂ Cu
A superconducting tape having a thickness of 0.1 mm and a width of 5 mm formed by covering a ₃ O _x oxide superconducting layer with a sheath material made of silver was used. The critical current density (Jc) of this superconducting tape is 77
5000A / cm ^{2 at} K and 0T, critical current (I
c) was about 8A. 20 superconducting tapes were laminated to form a block conductor having a thickness of 2 mm and a width of 5 mm. The Ic _{20 of} this block conductor is about 130A. In addition, four block conductors are prepared, and four blocks are assembled and fixed by soldering to obtain a thickness of 4 mm, a width of 10 mm, and an I
A superconducting conductor having c of about 500 A was obtained.

Next, the superconducting conductor is housed in a stabilizing material made of pure copper, and SUS304 having a thickness of 1.0 mm is provided around the stabilizing material.
Cover with a stainless pipe, wrap a semi-conductive tape around the circumference, wrap a polypropylene laminate sheet on it to form an insulating layer with a thickness of 5 mm, and wrap a 0.1 mm semi-conductive tape around the circumference. After that, a superconducting tape formed by forming a Y-Ba-Cu-O-based superconducting thin film having a thickness of 1 μm on a base material of Hastelloy C276 tape having a thickness of 0.1 mm was wound. When winding this superconducting tape, the superconducting thin film was wound on the inner peripheral side. Next, a diameter of 5
mm Poly-tetrafluoroethylene (Teflon) spacer is wrapped around it, and the thickness of pure copper is 1.0 m
m second protective pipe was covered, and a 10 mm-thick heat insulating layer made of super insulation was formed on the outer side of the second protective pipe to cover the first protective pipe. The outer surface of the first protective pipe was formed with a 5 mm thick anticorrosion layer made of polyethylene. With respect to the obtained superconducting power cable, liquid nitrogen was circulated from the liquid nitrogen cylinder to the refrigerant channel, and the liquid nitrogen was circulated so that the liquid nitrogen was returned from the refrigerant channel to the liquid nitrogen cylinder to cool the superconducting conductor. When this superconducting power cable was energized, it was confirmed that a superconducting current could flow and that it could operate stably. Next, when the withstand voltage of the superconducting power cable was measured, it was 80 kV before flowing the liquid nitrogen refrigerant, but was improved to 100 kV after flowing the liquid nitrogen. It is considered that this is because the liquid nitrogen used as the refrigerant permeated the superconducting shield layer and the insulating layer.

[0033]

As described above, according to the present invention, since the oxide superconducting conductor having a rectangular cross section is accommodated in the hollow stabilizing material in a fixed state, the magnetic force generated by itself when energized, etc. The oxide superconducting conductor moves due to the external force of
It does not vibrate. Further, when the cable is laid, the oxide superconducting conductor having a rectangular cross section can be used for laying the cable without causing twisting, and unnecessary strain due to twisting does not occur.

Since the refrigerant flow path outside the stabilizer and the refrigerant flow path outside the superconducting shield layer are provided, the refrigerant flow path outside the stabilizing material is used as the outward path of the refrigerant and the superconducting shield is used. If the refrigerant flow path outside the layer is used as the return path of the refrigerant, the circulation of the refrigerant can be performed. Therefore, the oxide superconducting conductor can be cooled efficiently, which contributes to stabilization of the superconducting characteristics. In addition, since the refrigerant flow path is formed between the internal protection pipe and the stabilizing material by the ridge formed on the outer surface of the stabilizing material, the oxide superconducting conductor housed and held inside the stabilizing material is used together with the stable household material. It is possible to secure the refrigerant flow path while stably maintaining the above, and it is possible to cool the oxide superconducting conductor by the refrigerant that passes through this refrigerant flow path. Further, since the refrigerant can be made to flow into the inside of the stabilizing material through the flow holes formed in the stabilizing material, the superconducting conductor can be efficiently and directly cooled by the flowing-in refrigerant.

On the other hand, when the insulating layer is formed by winding the insulating tape and the superconducting shield layer is formed by winding the superconducting tape, the refrigerant flowing through the refrigerant flow path outside the superconducting shield layer is prevented from flowing through the refrigerant of the superconducting tape. It can be made to soak into the insulating layer side through the gap of the winding part,
Further, the gap between the wound portion of the insulating tape and the wound portion of the semi-conductive tape can be soaked in, so that the insulating property of the insulating layer during cooling can be improved and the withstand voltage can be improved.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing an oxide superconducting conductor provided in the superconducting power cable shown in FIG.

FIG. 3 is an exploded perspective view showing an example of a stabilizer provided in the superconducting power cable shown in FIG. 1.

4 is a cross-sectional view showing another example of the stabilizing material shown in FIG.

5 is a cross-sectional view showing another example of the stabilizing material shown in FIG.

FIG. 6 is a cross-sectional view showing a first example of a conventional superconducting power cable.

FIG. 7 is a cross-sectional view of a superconducting tape provided in the conventional superconducting power cable shown in FIG.

FIG. 8 is a sectional view showing a second example of a conventional superconducting power cable.

FIG. 9 is a cross-sectional view showing a third example of a conventional superconducting power cable.

[Explanation of symbols]

30 Superconducting power cable, 31
Oxide superconducting conductor, 34, 35 stabilizing base material,
36 Stabilizer, 39, 40, 43 Projection, 46 Flow hole, 47
Internal protection pipe, 48 refrigerant flow paths, 4
9 insulating layer, 50 superconducting shield layer, 49a, 49b semiconductive layer, 52
Spacer, 53 Second protection pipe, 54 Refrigerant flow path,
55 heat insulation layer, 56 first protection pipe, 57 anticorrosion layer,

Claims (4)

(57) [Claims] 1. An oxide superconducting conductor having a rectangular cross section, and a hollow stabilizing material made of a metal material of good conductivity for accommodating and fixing the oxide superconducting conductor and having a ridge on its outer peripheral portion. , An internal protective pipe provided outside the stabilizing material to form a refrigerant flow path between the stabilizing material, a semiconductive layer and an insulating layer coated on the outer surface of the internal protective pipe, and the insulating material. A semi-conductive layer and a superconducting shield layer coated on the outer surface of the layer, and a second protective pipe having a refrigerant flow path formed between the superconducting shield layer and a spacer provided outside the superconducting shield layer, A heat insulating layer coated on the outer surface of the second protective pipe, a first protective pipe coated on the outer surface of the thermal insulating layer, and an anticorrosion layer coated on the outer surface of the first protective pipe. Oxide superconducting power cable characterized by. 2. The stabilizing material is configured by fitting two channel-shaped stabilizing base materials, and the outer surface of each stabilizing base material is abutted against the inner protective pipe on the outer side of the stabilizing base material. The oxide superconducting power cable according to claim 1, wherein a ridge that forms a refrigerant flow path is formed between the oxide pipe and the protective pipe. 3. The stabilizing material is provided with a plurality of circulation holes which serve as a cooling medium flow path for communicating the refrigerant flow path outside thereof with the inside of the stabilizing material. Alternatively, the oxide superconducting power cable described in 2. 4. A superconducting shield layer formed outside the insulating layer, wherein the insulating layer formed on the outer surface of the inner protective pipe is composed of an insulating tape wound around the outer surface of the inner protective pipe via a semiconductive layer. The oxide superconducting power cable according to claim 1, 2 or 3, wherein the superconducting tape is wound around the outer surface of the insulating layer via a semiconductive layer.