JP4956271B2 - Superconducting cable - Google Patents

Description

  The present invention relates to the technical field of superconducting cables, and more particularly to the technical field of superconducting cables suitable for laying in pipes and sinuses.

  Superconducting cables are used, for example, as part of a transmission line that transmits power from a power plant to a demand area, and are often laid in underground facilities (pipeways, tunnels) near urban areas. An example of a conventional superconducting cable is shown in FIG. As shown in the figure, the superconducting cable 900 is composed of a cable core 910 having a former 911, a superconducting conductor 912, an electrical insulating layer 913, and a protective layer 914, and a heat insulating tube 920 that accommodates the cable core. .

  The heat insulating tube 920 is configured by arranging two flexible coaxial tubes as an inner tube 921 and an outer tube 922, and a heat insulating layer 923 disposed between the inner tube 921 and the outer tube 922. The space formed by the inner tube 921 and the outer tube 922 is evacuated when the cable core 910 is cooled to enhance heat insulation.

  In a state where the superconducting cable 900 can be used, the space between the cable core 910 and the inner tube 921 of the heat insulating tube 920 is filled with a refrigerant such as liquid nitrogen, so that the cable core 910 and the inner tube 921 are in a cryogenic state. Is maintained. In such a cooling state, the cable core 910 contracts by heat, but at this time, the inner tube 921 and the outer tube 922 of the heat insulating tube 920 may be corrugated so that excessive tension does not act on the cable core 910. Gives flexibility.

  When the superconducting cable having the above-described configuration is laid in an underground part such as a conduit, a method of drawing the superconducting cable into a conduit or a sinus by applying tension from one end of the superconducting cable is used. At this time, since a large tension is applied to the tip of the superconducting cable, the cable core is damaged, or the corrugation processing applied to the inner tube and the outer tube of the heat insulating tube is extended, and the superconducting cable is removed. There has been a problem that it is difficult to draw the inside of a pipe or the like in a preferable state.

Therefore, Patent Document 1 discloses a superconducting cable in which a tension member formed of stainless steel or an aramid resin is provided on the outer surface of a heat insulating tube so that the superconducting cable can be drawn into a pipe or the like in a good state. . As a result, the tension member can share the tension applied when laying the superconducting cable on the pipe line, etc., and the cable core and the inner pipe and the outer pipe of the heat insulation pipe can be prevented from being tensioned. It is possible.
JP 2006-059695 A

However, the above conventional techniques have the following problems.
In order to put the superconducting cable into the superconducting state, when the liquid core is filled with liquid nitrogen and cooled, the superconducting conductor and the inner pipe are cooled from room temperature to liquid nitrogen temperature. Causes heat shrinkage. At this time, in order to prevent tension from being generated in the superconducting conductor and the inner tube, it is necessary to provide flexibility so that the outer tube can be contracted simultaneously. For this reason, corrugation is also applied to the outer tube.

  However, in Patent Document 1, since a tension member having low flexibility is fixed to the outer surface of the outer tube of the heat insulating tube, even if the outer tube attempts to contract according to the thermal contraction of the superconducting conductor or the inner tube, It cannot be easily shrunk when pulled by a member. Since the superconducting conductor, inner tube, and outer tube are fixed at the cable end, the outer tube, which is not easily heat-shrinkable, applies stress to the superconducting conductor and inner tube that are thermally contracted to stretch at the cable end. As a result, there is a problem that the superconducting conductor is mechanically damaged and the performance is deteriorated.

  In addition, since the above stress is concentrated on the cable end connecting the inner tube and the outer tube, there is a possibility that a crack will occur at the cable end. There is a problem that air leaks into the vacuum section between the two, and as a result, the vacuum state deteriorates and the heat insulation performance deteriorates. Furthermore, there is also a problem that tensile stress is concentrated on a portion where the heat insulating tube and the cable core are fixed, which may cause the cable core to come off the fixed portion.

  Therefore, the present invention has been made to solve the above problems, and can be laid in a pipe or the like without applying tension to the superconducting conductor and the heat insulating tube, and stress can be applied to the superconducting conductor and the heat insulating tube even during heat shrinkage due to cooling. An object of the present invention is to provide a superconducting cable capable of preventing the occurrence of the above.

A first aspect of the superconducting cable of the present invention is a superconducting cable comprising: a heat insulating tube having a cylindrical inner tube and an outer tube each corrugated; and a superconducting conductor housed inside the inner tube. And the tension member fixed to the outer surface of the at least one end part of the said inner pipe is characterized by the above-mentioned. By providing the tension member on the outer surface of the inner tube, the tension member can also be thermally contracted during thermal contraction due to cooling, and stress can be prevented from being generated in the superconducting conductor and the heat insulating tube.

  According to another aspect of the superconducting cable of the present invention, a pooling eye having a main body and a fixing bracket is provided at the one end where the tension member is fixed to the inner tube, and the end of the tension member is provided on the main body. And an end of the outer tube is connected to the fixing bracket. By pulling the tension member and the outer tube with the pooling eye provided in this way, the cable core and the inner tube can be drawn into the pipeline etc. with the tension member fixed to the inner tube without applying tension to the cable core. It becomes possible. Further, by pulling the outer tube at the same time with the fixing bracket, it is possible to prevent the stress from being generated between the inner tube and the outer tube.

  Another aspect of the superconducting cable of the present invention is characterized in that the superconducting conductor is disposed on an outer periphery of a cylindrical former having a Young's modulus smaller than that of the tension member, and the former is connected to the pooling eye. To do. It is possible to configure the former to be connected to the pooling eye in a state where the former is hardly stressed.

  Another aspect of the superconducting cable of the present invention is characterized in that the tension member is formed by spirally winding a stainless steel tape with a pitch of 300 mm or more and 2000 mm or less around the inner tube. Thus, when the pitch is set to 300 mm or more and 2000 mm or less, even when the superconducting cable is bent, it is possible to apply force evenly to the tension member.

  In another aspect of the superconducting cable of the present invention, the tension member is formed by arranging one or more fiber tapes formed by twisting high-tensile polymer fibers on the outer surface of the inner tube. Features. Thus, by using a polymer fiber having a smaller thermal conductivity than that of a metal, a function as a spacer can be provided between the inner tube and the outer tube.

  According to another aspect of the superconducting cable of the present invention, the tension member is formed by twisting a high-strength polymer fiber into a net-like shape so as to cover the outer surface of the inner tube. Features. The tension member can be easily formed by winding and constructing a tape-like material formed by twisting in a net shape.

  In another aspect of the superconducting cable of the present invention, the tension member is a linear body having a cross section whose thickness or diameter is substantially equal to the interval between the inner tube and the outer tube. It is characterized in that it is formed by arranging 4 or more and 10 or less at substantially equal intervals between them. By arranging the tension member in this manner, the tension member can serve as a spacer for keeping the distance between the inner tube and the outer tube constant as well as the role of traction.

  In another aspect of the superconducting cable of the present invention, the inner tube and the outer tube are corrugated so that the wave height is 5% or more and 20% or less of each diameter and the pitch is 1 to 4 times the wave height. It is processed. Both the inner tube and the outer tube have high flexibility by being corrugated in this way.

  As described above, according to the present invention, by providing the tension member on the outer surface of the inner tube of the heat insulation pipe, the superconducting conductor and the heat insulation pipe can be laid in a pipe or the like without applying tension, and the superconducting conductor and the heat insulation pipe are also provided. Thus, it is possible to provide a superconducting cable capable of preventing the occurrence of stress in the cable.

  A superconducting cable according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Each component having the same function is denoted by the same reference numeral for simplification of illustration and description.

  The structure of the superconducting cable according to the embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a superconducting cable 100 of the present embodiment, and FIG. 2 is a side view showing a cable core 110 provided in the superconducting cable 100. The superconducting cable 100 has a configuration in which a cable core 110 is housed inside a heat insulating tube 120.

  The cable core 110 has a structure in which a superconducting conductor 112 is disposed on the outer periphery of the former 111 and an electric insulating layer 113 and a protective layer 114 are provided on the outer periphery thereof. In the present embodiment, for example, a Bi-based or Y-based superconducting material can be used as the superconducting conductor 112, and a tape-like wire formed by tape-like this can be spirally wound on the former 111 and arranged.

  The former 111 is used to maintain the shape of the superconducting conductor 112, and for example, a nonmagnetic metal material can be used. The electrical insulating layer 113 can be formed by winding insulating paper such as kraft paper around the top of the superconducting conductor 112. The protective layer 114 can be formed using conductive paper or copper braided wire. Although not shown in FIG. 1, a superconducting conductor can be disposed between the protective layer 114 and the electrical insulating layer 113. In this case, the superconductor can confine the magnetic field generated from the cable and reduce the leakage magnetic field by passing a current in the opposite direction to the superconducting conductor 112.

  The heat insulation pipe 120 includes an inner pipe 121 and an outer pipe 122 which are coaxial pipes, and a heat insulation layer 123 disposed therebetween. For example, a metal such as stainless steel or aluminum can be used for the inner tube 121 and the outer tube 122, and a super insulation formed by laminating a polymer material film deposited with aluminum and a polyethylene net on the heat insulating layer 123. Can be used.

  When the superconducting cable 100 is in a superconducting state, the inside of the inner tube 121 is cooled with liquid nitrogen and maintained at a cryogenic state, while the outside of the outer tube 122 is at a room temperature, for example, so It is necessary to achieve high heat insulation using the heat insulating tube 120 so as to reduce heat transfer between the temperature and the room temperature as much as possible. Therefore, the heat insulating layer 123 is provided between the inner tube 121 and the outer tube 122, and the space between the inner tube 121 and the outer tube 122 is maintained in a high vacuum state of, for example, 0.1 MPa or less. In order to maintain such a high vacuum state, the heat insulation tube 120 is free from poor welding, cracks, pinholes, and the like, thereby realizing high airtightness.

  The inner tube 121 and the outer tube 122 are both corrugated and have high flexibility, thereby preventing a large stress from being applied to the superconducting conductor 112 during cooling and in a cryogenic state. That is, in a state where the superconducting cable 100 can be used, the space between the cable core 110 and the inner tube 121 of the heat insulating tube 120 is filled with a refrigerant such as liquid nitrogen, and is cooled to a cryogenic state of 77K, for example. As a result, both the cable core 110 and the inner tube 121 are thermally contracted, but the two are not necessarily contracted by the same length due to cooling. If the lengths of both the heat contraction are different, a large stress is applied to the cable core 110. Will be added.

  In addition, since the outer side of the outer tube 122 is at room temperature, for example, the outer tube 122 does not undergo thermal contraction as described above. As a result, the magnitude of the heat shrinkage differs among the cable core 110, the inner tube 121, and the outer tube 122, and there is a possibility that stress that pulls each other is generated. In this embodiment, the inner tube 121 and the outer tube 122 of the heat insulating tube 120 are corrugated to have flexibility, thereby preventing such stress from occurring.

  By providing the inner tube 121 with flexibility, even if there is a difference in thermal shrinkage between the cable core 110 and the inner tube 121, tension is not applied to the cable core 110 due to expansion and contraction of the inner tube 121. be able to. In addition, by giving flexibility to the outer tube 122, the heat insulation tube 120 can be easily contracted in accordance with the thermal contraction of the cable core 110 and the inner tube 121, so that no stress is applied to the cable core 110. In addition, the occurrence of cracks is prevented by preventing stress from being applied to the joint between the inner tube 121 and the outer tube 122.

  The structure of the heat insulation pipe | tube 120 is demonstrated according to a manufacturing process procedure. In addition to stainless steel or aluminum, a plate having a thickness of 0.5 mm to 2 mm made of any metal of copper or an alloy containing these as a main component is used, and is formed in a cylindrical shape so as to accommodate the cable core 110. Thereafter, the inner tube 121 is formed by corrugating from the outside. Thereafter, the heat insulating layer 123 is wound around the inner tube without a gap on the outer side of the inner tube 121. Further, a metal plate having a thickness of 0.5 mm to 2 mm is formed on the outside in a cylindrical shape, and the outer tube 122 is formed by corrugating the outside. The corrugation processing is performed so that the wave height is 5 to 20% deep with respect to the diameter of the inner tube 121 or the outer tube 122, and the pitch (wave period) of one mountain valley is 1 to 4 times the wave height. Yes.

  In order to prevent the superconducting cable 100 from being damaged by friction when the superconducting cable 100 is drawn into a pipe or the like during installation, or to prevent corrosion after installation, a protective coating portion 130 is provided on the outer periphery of the heat insulating pipe 120. . The protective coating 130 can be formed using a resin such as vinyl chloride resin, polyethylene, or nylon.

  In the present embodiment, the tension member 140 is further arranged on the outer surface of the inner tube 121 with respect to the superconducting cable 100 having the above structure. The tension member 140 needs to be installed so as not to impair the flexibility of the heat insulating pipe 120. In particular, the inner pipe 121 to which the tension member 140 is fixed is not subjected to large stress even during cooling. It is necessary to install as follows.

  Therefore, in this embodiment, the tension member 140 is fixed to the inner tube 121 only at one end of the superconducting cable 100. FIG. 1 shows that the tension member 140 is fixed to the inner tube 121 by the fixing portion 141. The tension member 140 can be formed using a high-strength alloy such as stainless steel or Ni alloy, or a high-strength super fiber such as an aramid resin or an aramid fiber, and the tension can be increased.

  The tension member 140 of the present embodiment is formed by spirally winding a stainless steel tape formed in a tape shape around the outer surface of the inner tube 121 so as not to impair the flexibility of the heat insulating tube 120. Yes. For example, it may be arranged along the inner tube 121 in the longitudinal direction. When the tension member 140 is formed by spirally winding a stainless steel tape, the winding pitch is preferably 300 mm or more and 2000 mm or less. Here, the winding pitch is the moving distance in the longitudinal direction when one stainless steel tape is spirally wound around the outer periphery of the inner tube 121 one turn.

  The shape of the tension member 140 is not limited to the tape shape, and may be, for example, a square line or a round line. The tension member 140 may be disposed along the inner tube 121 or may be installed by being spirally wound. Further, as a material used for the tension member 140, a stainless steel wire, an invar wire, or the like may be used in addition to the above stainless steel tape. One layer of these stainless steel tapes or wires may be wound around the outer surface of the inner tube 121, or two layers may be wound in the opposite direction to form the tension member 140. When two layers are wound, each layer is pulled in the direction of rotation opposite to each other, so that the heat insulation pipe 120 can be prevented from being twisted.

  As another material used for the tension member 140, high-tensile polymer fibers such as Kevlar (registered trademark of DuPont, USA) and arylate fibers can also be used. When using these, in addition to forming the tension member 140 by directly wrapping around the inner tube 121 as described above, each fiber is twisted in advance in a tape shape, and this is applied to the outer surface of the inner tube 121. It is also possible to install. Thus, FIG. 3 shows an embodiment of the tension member installed on the outer surface of the inner tube 121 after being twisted into a tape shape. The tension member 240 is composed of a plurality of fiber tapes 241 formed by twisting the high-tensile polymer fibers as described above.

  As a tension member of still another embodiment of the present invention, it is also possible to form the tension member on the outer surface of the inner tube 121 by twisting it in a net shape. An example of a tension member formed in this way is shown in FIG. The tension member 340 is formed by twisting in a net shape using high-tensile polymer fibers, and is installed so as to cover the outer surface of the inner tube 121.

  A tension member according to still another embodiment of the present invention will be described with reference to FIG. The tension member 440 of the present embodiment is formed in a linear shape having a cross section whose thickness or diameter is substantially equal to the distance between the inner tube 121 and the outer tube 122, and this is about 4 to 10 inner tubes 121. The outer tube 122 is wound around the inner tube 121 at substantially equal intervals. The tension member 440 installed in this way can serve as a spacer for pulling the superconducting cable 100 when it is laid and making the distance between the inner tube 121 and the outer tube 122 constant.

  In the embodiment shown in FIG. 5, since the tension member 440 contacts not only the inner tube 121 but also the outer tube 122, heat is transmitted from the outer tube 122 to the inner tube 121 via the tension member 440. In order to reduce as much as possible, it is preferable to form the tension member 440 using a material having as low a thermal conductivity as possible.

  The heat insulating layer 123 installed between the inner tube 121 and the outer tube 122 is disposed on the outer periphery of the tension member 140 installed on the outer surface of the inner tube 121. As the heat insulating layer 123, for example, a layer formed by evaporating aluminum on a resin film can be used. In addition, when there is a possibility that the tension member 140 may damage the heat insulating layer 123, a metal steel strip or a fiber tape may be wound around the outer periphery of the tension member 140, and the heat insulating layer 123 may be installed thereon. it can.

  In the superconducting cable 100 configured as described above, when the inner tube 121 is filled with liquid nitrogen after being laid in a pipe or the like, the cable core 110 and the inner tube 121 and the outer surface thereof are installed. The tension members 140 are both cooled to the liquid nitrogen temperature and thermally contracted by substantially the same length. As a result, there is no possibility that the inner tube 121 and the tension member 140 will apply stress to the cable core 110 to break it or change its characteristics.

  Even when the length of heat shrinkage between the cable core 110 and the inner tube 121 is different, the inner tube 121 is contracted to substantially the same length as the cable core 110 because the inner tube 121 is flexible. Is done. Even when the length of the tension member 140 that is thermally contracted is different from that of the cable core 110 and the inner tube 121, the tension member 140 is fixed only by the inner tube 121 at one end of the fixing portion 141. However, no stress is applied to the inner tube 121.

  Furthermore, since the tension member 140 is installed in the inner tube 121 in such a shape that can be easily contracted as described above, the tension member 140 can also contract to a length substantially equal to the inner tube 121 and the cable core 110. it can. As a result, there is no possibility that the inner tube 121 and the tension member 140 will apply stress to the cable core 110 to break it or change its characteristics.

  On the other hand, the outer tube 122 of the heat insulating tube 120 is not shrunk due to its temperature being maintained at about room temperature, but is corrugated and has high flexibility. It can be easily shrunk along with heat shrinkage. As described above, along with the thermal contraction of the cable core 110 and the like due to cooling, all of the inner tube 121, the outer tube 122, and the tension member 140 of the heat insulating tube 120 can be contracted without applying stress to each other. . As a result, the conventional problem that the outer tube is pulled by the tension member during cooling and cannot be easily contracted can be solved, and damage to the cable core 110 and the superconducting conductor 112 installed thereon can be prevented. Can do.

  Next, a pooling eye for drawing the superconducting cable 100 of the present embodiment into a conduit or the like will be described. In order to draw the superconducting cable 100 into a pipe line or the like, a method of connecting a pooling eye to the end of the superconducting cable 100 and connecting it with a rope or the like is used, but a large tension is applied to the pooling eye. If the connection between the pooling eye and the superconducting cable 100 is not appropriate, problems such as applying a large tension to a part of the superconducting cable 100 and damaging it or degrading the superconducting performance occur. The pooling eye is connected to the superconducting cable 100 at one end portion of the fixing portion 141 where the tension member 140 is fixed to the inner tube 121.

  Accordingly, a superconducting cable 500 according to an embodiment of the present invention in which a pooling eye is suitably connected to the one end will be described with reference to FIG. FIG. 6 shows a longitudinal cross-sectional view of the superconducting cable 500 of this embodiment with the pooling eye 550 connected to the end. In this embodiment, a pooling eye 550 is connected to the end of the superconducting cable main body 501, and the pooling eye 550 has a structure in which a fixing bracket 552 is screw-connected to the main body 551. The main body 551 is provided with a pulling cap 551a for connecting a rope or the like when laying. For example, the superconducting cable 100 according to the first embodiment can be used as the superconducting cable main body 501.

  In the method of connecting the pooling eye 550 to the end portion of the superconducting cable main body 501, the tension member 140 is welded to the main body 551 and the outer pipe 122 of the heat insulating pipe 120 is welded to the fixing bracket 552. With this connection, when the pooling eye 550 is pulled, the cable core 110 and the inner tube 121 of the heat insulating tube 120 are pulled to the pooling eye 550 via the tension member 140, and at the same time, the outer tube 122 is fixed to the fixing bracket 552. It is pulled by the pooling eye 550 through.

  As described above, as a result of pulling the tension member 140 and the outer tube 122 with the pooling eye 550, the cable core 110 and the cable core 110 and the cable member 110 are fixed to the inner tube 121 without applying tension to the cable core 110. It becomes possible to draw the inner pipe 121 into a pipe line or the like. Further, by simultaneously pulling the outer tube 122 with the fixing bracket 552, it is possible to prevent stress from being generated between the inner tube 121 and the outer tube 122, and between the inner tube 121 and the outer tube 122. It is possible to prevent a situation in which the degree of vacuum is reduced by damaging the joint.

  The former 111 of the cable core 110 can also be configured to be connected to the pooling eye 550, but in this case, it is preferable to use the former 111 having a Young's modulus smaller than the tension member 140. Thereby, the stress applied to the superconducting cable main body 501 from the pooling eye 550 can be applied to the tension member 140, and the former 111 can be hardly stressed.

  The process of connecting the pooling eye 550 to the superconducting cable body 501 will be described below. First, the end of the tension member 140 is welded and joined to the first welded portion 551b of the pooling eye main body 551 which is the main body of the pooling eye 550. Thereafter, the fixing bracket 552 is screwed into the threaded portion of the main body 551 and fixed, and the outer tube 122 is welded to the second welding portion 552a at the tip of the fixing bracket 552. As a result, the pooling eye 550 is integrated with the superconducting cable body 501 to form the superconducting cable 500. In addition, the welding of the second welded portion 552a is preferably a full circumference welding, and it is preferable that the second welding portion 552a be hermetically sealed so that water or the like does not enter from the outside.

  As an example of laying the superconducting cable 500 of this embodiment, when the superconducting cable 500 having a length of 500 m was drawn into a predetermined pipe line, a tension of 170 kN at maximum was applied to the pooling eye 550. No tension was applied to 112. As a result, the superconducting performance of the superconducting conductor 112 was not affected at all. In the present embodiment, since tension is not applied to the cable core 110, even when the superconducting cable main body 501 is bent along the pipe line, it is pressed against the heat insulating pipe 120 and a side pressure is applied. Can be avoided. As a result, the electric insulation layer 113 surrounding the outer periphery of the superconducting conductor 112 is not damaged, such as being crushed or rubbed, and no problem in electric insulation performance occurs.

  In addition, after superconducting cable 500 is laid on a predetermined pipeline, the end of superconducting cable body 501 is connected to a predetermined terminal connection portion and filled with liquid nitrogen, whereby cable core 110 is brought to a predetermined cryogenic state. When cooled, the cable core 110 having a length of 500 m thermally contracted by 1.5 m. The inner tube 121 and the tension member 140 are similarly thermally contracted together with the cable core 110, and the outer tube 122 is also smoothly contracted along with it, so that the superconducting cable body 501 is not buckled in the middle, and the end portion It was also possible to avoid the occurrence of leaks due to cracks. Furthermore, it was confirmed that the superconducting conductor 112 could be laid and cooled soundly without a decrease in the critical current.

  In the above embodiment, a superconducting power cable for power transmission has been described as an example. However, the present invention is not limited to this. For example, a superconducting bus line that supplies power to a superconducting power storage device or a large superconducting magnet used in a nuclear fusion reactor, etc. It is also possible to apply to. The description in the present embodiment shows an example of the superconducting cable according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the conductive cable in the present embodiment can be appropriately changed without departing from the spirit of the present invention.

1 is a longitudinal sectional view of a superconducting cable according to an embodiment of the present invention. It is a side view of the cable core built in the superconducting cable of this embodiment. It is a perspective view which shows the tension member used in another embodiment of this invention. It is a perspective view which shows the tension member used in another embodiment of this invention. It is sectional drawing which shows the tension member used in another embodiment of this invention. It is longitudinal direction sectional drawing of the superconducting cable which concerns on another embodiment of this invention. It is longitudinal direction sectional drawing which shows an example of the conventional superconducting cable.

Explanation of symbols

100, 500, 900 Superconducting cable 110, 910 Cable core 111, 911 Former 112, 912 Superconducting conductor 113, 913 Electrical insulation layer 114, 914 Protective layer 120, 920 Heat insulation pipe 121, 921 Inner pipe 122, 922 Outer pipe 123, 923 Thermal insulation layer 130 Protective coating 140, 240, 340, 440 Tension member 501 Superconducting cable body 550 Pooling eye 551 Pooling eye body 552 Fixing bracket

Claims (8)

A heat insulating tube having a cylindrical inner tube and an outer tube each corrugated;
A superconducting cable comprising a superconducting conductor housed inside the inner tube,
A superconducting cable comprising a tension member fixed to an outer surface of at least one end of the inner tube. A pooling eye having a main body and a fixing bracket is provided at the one end where the tension member is fixed to the inner pipe,
Connecting the end of the tension member to the body;
The superconducting cable according to claim 1 , wherein an end portion of the outer tube is connected to the fixing bracket. The superconducting conductor is disposed on the outer periphery of a cylindrical former having a Young's modulus smaller than the tension member,
The superconducting cable according to claim 2 , wherein the former is connected to the pooling eye. The superconducting cable according to any one of claims 1 to 3 , wherein the tension member is formed by spirally winding a stainless steel tape around the inner tube with a pitch of 300 mm or more and 2000 mm or less. The tension members are one of claims 1 to 3, characterized in that it is formed of one or more fiber tape formed by twisting high-tensile polymeric fibers disposed on the outer surface of the inner tube The superconducting cable according to item 1. The tension members can be of any claims 1 to 3, characterized in that it is formed by a high-tensile polymeric fibers disposed one formed by twisting a mesh to cover the outer surface of the inner tube 121 The superconducting cable according to claim 1. The tension member includes four or more linear bodies having a cross section whose thickness or diameter is substantially equal to the interval between the inner tube and the outer tube, and approximately 10 or more between the inner tube and the outer tube. The superconducting cable according to any one of claims 1 to 4 , wherein the superconducting cable is arranged and formed as follows. The inner tube and the outer tube, claims, characterized in that it is 5% or more and 20% or less of the height and corrugation machining to be a 1-fold or more than four times the pitch of the wave height of the respective diameters The superconducting cable according to any one of 1 to 7 .

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