JP2023161914A - Laminated wire overhead structure, and method for manufacturing the same - Google Patents

Abstract

To provide a novel laminated wire overhead structure whose connection resistance is fit within a fixed range and in which a plurality of laminated wires are connected without deteriorating a critical current.SOLUTION: A laminated wire overhead structure is formed by connecting a plurality of laminated wires, in which a long-sized first wire having a first superconducting layer and a long-sized second wire having a second superconducting layer are laminated, in a lengthwise direction, where an overhead wiring part of the laminated wires has a first bypass which has a third superconducting layer and connects adjacent two first wires, and a second bypass which has a fourth superconducting layer and connects adjacent two second wires, between the first wire and the second wire, the third superconducting layer of the first bypass is arranged so as to face the first superconducting layer of adjacent two first wires, and the fourth superconducting layer of the second bypass is arranged so as to face the second superconducting layer of adjacent two second wires.SELECTED DRAWING: Figure 2

Description

The present invention relates to a laminated wire overhead wire body and a method for manufacturing the same.

Since the critical temperature of high-temperature superconductors exceeds the temperature of liquid nitrogen, high-temperature superconductors are expected to be applied to superconducting magnets, superconducting cables, power equipment, devices, etc., and many research results have been reported.

In order to apply high-temperature superconductors to the above-mentioned fields, they need to be made into long wires. In particular, when using a compound containing rare earth (RE) as a high-temperature superconducting compound, the high-temperature superconducting compound may be laminated on a metal substrate such as a metal tape to form a tape-shaped wire. Common.

In recent years, a face-to-face double stacked wire (hereinafter also referred to as "FFDS wire") has been proposed, which is made by laminating two RE-based superconducting wires with superconducting layers containing rare earth elements so that the superconducting layers face each other. (Refer to Non-Patent Documents 1 to 3). Since RE-based high-temperature superconducting wires are manufactured through a long thin film formation process, current technology cannot completely eliminate defects (sites that lower Ic) present in the wires. On the other hand, in the above-mentioned FFDS wire, even if a defect occurs in one wire, the current is transferred to the other opposing wire, and the current can proceed while avoiding the defect. In other words, the influence of defects in the wire can be reduced. Furthermore, in the FFDS wire, since the superconducting layer is close to the stress center, the bending strength is strong. Furthermore, since the FFDS wire is made by bonding two superconducting wires together, it has a critical current (Ic) twice that of a normal superconducting wire. However, in order to apply such FFDS wire to magnets, cables, rotating machines, etc., a long wire of many kilometers is required.

Takanobu Kiss, et.al., "Analysis and Modeling of Current Transport Properties in Long Length Coated Conductors", International Symposium on Superconductivity 2017 Takanobu Kisu and 7 others, “Current-Voltage Characteristics in Face-to-Face Double Stacked (FFDS) 1-mm-Wide REBCO Coated Conductor Tapes)”, 96th 2018 Spring Cryogenic Engineering and Superconductivity Society, May 2018 Yudai Onizuka, 9 others, "Improvement of Robustness of Current Transport Properties in REBCO Coated Conductor by Face-to-Face Double Stack Structure" , 98th 2019 Spring Cryogenic Engineering and Superconductivity Society of Japan, May 2019

However, with current technology, it is difficult to make the single length of RE-based superconducting wires and FFDS wires several kilometers, and there is an urgent need to establish a connection method for FFDS wires. In addition, in applications of superconducting wires, connections are required in various situations such as connections between coils, and there is a need to provide laminated wire overhead wire bodies and methods for manufacturing the same.

Therefore, an object of the present invention is to provide a new laminated wire overhead wire body in which a plurality of laminated wires are connected without deteriorating the critical current (Ic), and a method for manufacturing the same.

That is, the present invention provides a laminated wire material in which a first elongated wire material having a first superconducting layer containing a rare earth element and a second elongated wire material having a second superconducting layer containing a rare earth element are laminated. A laminated wire overhead wire body in which a plurality of laminated wire rods are connected in the length direction, and the connection portion between the laminated wire rods has a third superconducting layer containing a rare earth element between the first wire rod and the second wire rod, and a first bypass for connecting two adjacent first wires; and a second bypass having a fourth superconducting layer containing a rare earth element and for connecting two adjacent second wires. The third superconducting layer of the first bypass is arranged to face the first superconducting layers of two adjacent first wires, and the fourth superconducting layer of the second bypass is A laminated wire connection body is provided, which is arranged so as to face the second superconducting layers of two adjacent second wires.

Further, the present invention provides a plurality of laminated wire rods in which a first elongated wire rod having a first superconducting layer containing a rare earth element and a second elongated wire rod having a second superconducting layer containing a rare earth element are laminated. a step of preparing a first bypass having a third superconducting layer containing a rare earth element, and a second bypass having a fourth superconducting layer containing a rare earth element, and one laminated wire of the plurality of laminated wires. a step of separating the first wire rod and the second wire rod at an end portion of the wire rod, and a step of separating the first wire rod and the second wire rod at an end portion of another laminated wire rod among the plurality of laminated wire rods. The first bypass is arranged such that the third superconducting layer of the first bypass faces the first superconducting layer of the two laminated wires, and the fourth superconducting layer of the second bypass is Provided is a method for manufacturing a laminated wire connection body, including the step of arranging the second bypass so as to face the second superconducting layer of the two laminated wires.

According to the present invention, a new laminated wire connector in which a plurality of laminated wires are connected without deteriorating the critical current (Ic), and a method for manufacturing the same are provided.

FIG. 1A is a schematic sectional view of a first wire rod and a second wire rod, and FIG. 1B is a schematic sectional view of a laminated wire rod. FIGS. 2A to 2D are schematic cross-sectional views for explaining the structure of the connection portion between the laminated wires of the laminated wire connection body according to the embodiment of the present invention. 3A to 3E are perspective views showing an example of a method for manufacturing a laminated wire connection body according to an embodiment of the present invention. 4A to 4F are perspective views showing an example of a method for manufacturing a laminated wire connection body according to another embodiment of the present invention. 5A to 5F are perspective views showing an example of a method for manufacturing a laminated wire connection body according to another embodiment of the present invention. 6A to 6F are perspective views showing an example of a method for manufacturing a laminated wire connection body according to another embodiment of the present invention. FIG. 7A is a perspective view showing the configuration of a laminated wire connection body of a comparative example, and FIG. 7B is a graph showing the current-voltage characteristics of the laminated wire connection body. FIG. 8A is a schematic cross-sectional view of the connection portion of the laminated wire connection body of the example, and FIG. 8B is a graph showing the current-voltage characteristics of the laminated wire connection body. FIG. 9A is a schematic cross-sectional view of the connection portion of the laminated wire connection body of the example, and FIGS. 9B to 9D are graphs showing current-voltage characteristics when the conditions of the laminated wire connection body are changed. FIG. 10A is a schematic diagram for explaining the method of measuring bending strength, FIG. 10B is a graph showing current-voltage characteristics when measuring bending strength, and FIG. It is a graph showing the relationship between the diameter of the tool and the critical current (Ic). FIG. 11A is a schematic cross-sectional view of the connection part of the laminated wire connection body of the example, FIG. 11B is a graph showing current-voltage characteristics when bending strength is measured, and FIG. 11C is a graph showing the current-voltage characteristics when bending strength was measured. 2 is a graph showing the relationship between the diameter of the jig and the critical current (Ic) in FIG. FIG. 12A is a schematic cross-sectional view of the connection part of the laminated wire connection body of the example, FIG. 12B is a graph showing current-voltage characteristics when bending strength is measured, and FIG. 12C is a graph showing the current-voltage characteristics when bending strength was measured. 2 is a graph showing the relationship between the diameter of the jig and the critical current (Ic) in FIG. FIG. 13 is a graph showing the current-voltage characteristics of the laminated wire connector of the present invention in which 23 laminated wires are connected.

In this specification, a numerical range indicated by "~" means a numerical range including the numerical values written before and after "~".

1. Laminated Wire Connector The laminated wire connector of the present invention (hereinafter also referred to as "FFDS wire connector") includes a long first wire having a first superconducting layer containing a rare earth element and a rare earth element. It is a structure in which a plurality of laminated wire rods (hereinafter also referred to as "FFDS wire rods") in which a long second wire rod having a second superconducting layer is laminated are connected in the length direction. The number of FFDS wire rods in the FFDS wire rod connection body is not particularly limited, and may be, for example, two or three or more. Further, the length of each FFDS wire is not particularly limited, and an example is an FFDS wire with a length of 100 m to 150 m. Hereinafter, the structure of each FFDS wire rod included in the FFDS wire rod connection body will be described, and then the connection portion between the FFDS wire rods will be described.

(About FFDS wire)
The FFDS wire has a structure in which two wires (also referred to as a first wire and a second wire in this specification) are bonded together so that their superconducting layers face each other. In this specification, "the superconducting layers face each other" means that the two superconducting layers face each other without sandwiching the metal substrate, and there is no space between the two superconducting layers. Other layers (eg, stabilization layer, intermediate layer, etc.) may also be included.

FIG. 1A shows a sectional view perpendicular to the length direction of the first wire 101 and the second wire 102, and FIG. 1B shows a sectional view perpendicular to the length direction of the FFDS wire 100.

As shown in FIG. 1A, the first wire 101 has a structure in which a first metal substrate 11a, a first buffer layer 12a, a first superconducting layer 13a, and a first stabilizing layer 14a are stacked in this order. Similarly, the second wire 102 has a structure in which a second metal substrate 11b, a second buffer layer 12b, a second superconducting layer 13b, and a second stabilizing layer 14b are laminated in this order.

In addition, as shown in FIG. 1B, the two wire rods (the first wire rod 101 and the second wire rod 102) can be formed by disposing an intermediate layer 15 between the first stabilizing layer 14a and the second stabilizing layer 14b. It is pasted together.

The first metal substrate 11a and the second metal substrate 11b (hereinafter collectively referred to as "metal substrate 11") are elongated substrates capable of supporting each layer placed thereon. However, the type is not particularly limited. However, it is preferable that the metal substrate 11 has low magnetism, high heat resistance, and high strength. If the metal substrate 11 has these features, it becomes easier to apply the FFDS wire connection body to various uses. The metal substrate 11 may be comprised of a single layer or may be comprised of multiple layers. Further, the first metal substrate 11a and the second metal substrate 11b may be the same type of substrate, or may be different types of substrates.

Examples of materials for the metal substrate 11 include nickel (Ni), nickel alloy, tungsten alloy, stainless steel, silver (Ag), copper (Cu), and the like. More specifically, Ni-Cr alloys such as Hastelloy (registered trademark) B, Hastelloy (registered trademark) C, and Hastelloy (registered trademark) X; W-Mo alloys; Fe-Cr alloys such as austenitic stainless steel; Alloys; non-magnetic Fe--Ni alloys; and the like. The metal substrate 11 preferably has a Vickers hardness (Hv) of 150 or more from the viewpoint of strength. Further, the thickness of the metal substrate 11 is preferably 100 μm or less.

The first buffer layer 12a and the second buffer layer 12b (hereinafter also collectively referred to as "buffer layer 12") are the first superconducting layer 13a and the second superconducting layer 13b (hereinafter collectively referred to as "superconducting layer 12"). 13'') on the metal substrate 11. The first buffer layer 12a and the second buffer layer 12b may be the same type of layer or may be different types of layers.

The buffer layer 12 preferably has biaxial orientation, and may be composed of a single layer or a plurality of layers. When the buffer layer 12 is composed of multiple layers, a diffusion prevention layer for suppressing the diffusion of elements from the metal substrate 11 to the superconducting layer 13 side, and an alignment layer for imparting biaxial orientation to the buffer layer 12. It is preferable to include the following.

As an example of the buffer layer 12 consisting of multiple layers, in order from the metal substrate 11 side, ₃ layers of Al ₂ O or ₇ layers of Gd ₂ ZrO (first layer) / ₃ layers of Y ₂ O (second layer) / MgO layer (Third layer) / ₃ layers of LaMnO (4th layer) / ₂ layers of CeO (5th layer) are laminated in this order. However, the buffer layer 12 is not limited to this configuration; for example, there may be one without _two CeO layers (fifth layer), or one where Al ₂ O ₃ /Y ₂ O ₃ serves as the first layer and the second layer. Various configurations can be used, such as: Further, the thickness of each layer is appropriately selected. The total thickness of the buffer layer 12 is preferably less than 1.5 μm.

The superconducting layer 13 (first superconducting layer 13a and second superconducting layer 13b) is not particularly limited as long as it contains a superconductor containing a rare earth element. Examples of the superconducting layer 13 include REBa ₂ Cu ₃ O _x based compounds (RE is selected from Gd, Eu, Y, Sm, Nd, Dy, Er, Yb, Ho, La, Tb, Tm, and Lu) as superconductors. and x represents at least one element selected from the group consisting of 6.2 to 7.0. Here, RE may be any of the above elements, but Y, Gd, Eu or a combination of Y and Gd is preferred, and Y or a combination of Y and Gd is particularly preferred. Further, the amount of the REBa ₂ Cu ₃ O _x based compound in the superconducting layer 13 is preferably 70% by volume or more, more preferably 80 to 100% by volume. The first superconducting layer 13a and the second superconducting layer 13b may be the same type of layer or may be different types of layers.

Further, the thickness of the superconducting layer 13 is preferably 0.5 μm or more and 5.0 μm or less, more preferably 1.0 μm or more and 2.0 μm or less. When the thickness of the superconducting layer 13 is within this range, the FFDS wire connector can be easily used for various purposes.

The first stabilizing layer 14a and the second stabilizing layer 14b (hereinafter also collectively referred to as "stabilizing layer 14") are layers for suppressing deterioration of the superconducting layer 13, for example, the superconducting layer 14. This layer contains silver, which does not easily react with the superconductor in No. 13. In addition to the layer made of silver, the stabilizing layer 14 may further include a layer containing copper, gold, platinum, an alloy thereof, or the like. The first stabilizing layer 14a and the second stabilizing layer 14b may be of the same type or may be of different types. Further, the thickness of the stabilizing layer 14 is preferably several μm or more.

The intermediate connection layer 15 is preferably a layer formed of a conductive material such as solder or alloy paste. Furthermore, as will be described later, when connecting a plurality of FFDS wires 100, the first stabilizing layer 14a of the first wire 101 and the second stabilizing layer 14b of the second wire 102 are connected at the ends of the FFDS wire 100. Separation needs to be made between. Therefore, the intermediate connection layer 15 is preferably a layer that is easily melted by heat, and is preferably a layer formed of solder.

Further, the resistance of the intermediate connection layer 15 is usually preferably 100 nΩ or less, more preferably 50 nΩ or less. When the resistance of the intermediate connection layer 15 is 100 nΩ or less, when one superconducting layer 13 has a defect, a superconducting current tends to flow into the other superconducting layer 13 side, and the critical current (Ic ) becomes difficult to decrease.

The thickness of the intermediate connection layer 15 is preferably 2 μm or more and 20 μm or less. When the thickness of the intermediate connection layer 15 is within this range, when connecting the plurality of FFDS wires 100, it becomes easy to separate the first wire 101 and the second wire 102 at the end of the FFDS wire 100.

Note that each FFDS wire may include layers other than the above-mentioned layers, if necessary. For example, a layer containing silver or copper (not shown) may be further disposed on the side opposite to the buffer layer of each metal substrate 11, and a solder layer (not shown) may be further disposed outside of the layer. Good too.

(About the overhead line parts of two adjacent FFDS wires)
Next, the structure of the overhead wire section that connects two adjacent FFDS wire rods 100 will be described with reference to FIGS. 2A to 2D. 2A to 2D are all cross-sectional views taken in the vicinity of the overhead wire section 2 of the FFDS wire overhead wire body 1, taken parallel to the length direction. In FIGS. 2A to 2D, two wire rods (hereinafter, one wire rod will be referred to as the "first FFDS wire rod 100" and the other wire rod will also be referred to as the "second FFDS wire rod 200") are connected using different methods. ing. In an FFDS wire overhead wire body, FFDS wires of the same type and structure are usually connected. Therefore, in the following, the first FFDS wire rod 100 and the second FFDS wire rod have the same configuration, and the respective first wire rods 101, 201 and second wire rods 102, 202 are of the same type and have the same configuration. It will be explained as follows. However, the structure of the FFDS wire overhead wire body and the manufacturing method of the FFDS wire overhead wire body of the present invention can also be applied to the case where different types of FFDS wire rods are connected.

In any aspect, the overhead wire section 2 of the FFDS wire overhead wire body 1 of the present invention includes a first bypass 310 for connecting two adjacent first wire rods 101, 201, two adjacent second wire rods 102, 202, and these are inserted between the first wire rods 101, 201 and the second wire rods 102, 202. Further, the first bypass 310 includes a superconducting layer (not shown, also referred to as a "third superconducting layer" in this specification) containing a rare earth element, and the superconducting layer is connected to the two adjacent first wires 101. , 201 to face the first superconducting layer (not shown). Similarly, the second bypass 320 also has a superconducting layer (not shown, also referred to as a "fourth superconducting layer" in this specification) containing a rare earth element, and the superconducting layer is connected to the two adjacent second wires 102. , 202 so as to face the second superconducting layer (not shown).

Here, the structure of the first bypass 310 and the second bypass 320 is not particularly limited, and it is sufficient that each includes a superconducting layer, but they may have the same structure as the first wire 101 and the second wire 102 described above. preferable. Specifically, the first bypass 310 preferably includes a third metal substrate, a third buffer layer, a third superconducting layer, and a third stabilizing layer. Similarly, second bypass 320 preferably includes a fourth metal substrate, a fourth buffer layer, a fourth superconducting layer, and a fourth stabilizing layer. Further, the type (composition) of each layer of the first bypass 310 and the second bypass 320 may be the same as or different from those of the first wires 101 and 201 and the second wires 102 and 202. Each layer included in the first bypass 310 and the second bypass 320 is the same as each layer explained for the above-mentioned FFDS wire material, so a detailed explanation is omitted here, and the first to fourth aspects of the overhead wire section 2 are explained below. The detailed structure of the embodiment will be explained below.

- First aspect In the first aspect shown in FIG. 2A, the first bypass 310 and the second bypass 320 are inserted in a stacked state between the first wire rods 101, 201 and the second wire rods 102, 202. ing. At this time, the first bypass 310 and the second bypass 320 are arranged such that the metal substrates (not shown) face each other.

The lengths of the first bypass 310 and the second bypass 320 (hereinafter also collectively referred to as "bypasses 310, 320") in this embodiment (the length indicated by L2 in FIG. 2A) may be the same as each other. They can often be different, but they are usually the same. In addition, the length of each bypass 310, 320 is such that when the current flows from the first FFDS wire 100 to the second FFDS wire 200, the current flowing through each wire (the first wire 101 or the second wire 102) is Any length is sufficient as long as it can pass through the bypasses 310 and 320 and return to the wire (first wire 201 or second wire 202), and is usually preferably about 3 to 16 cm, more preferably about 6 to 12 cm. When the length of the bypass 310, 320 is 3 cm or more, the current flowing through the wire moves to the bypass 310, 320, and then easily returns to the wire again. On the other hand, when the length of the bypasses 310 and 320 is 16 cm or less, there is an advantage that the length of the overhead wire section 2 does not become excessively long.

In addition, when viewed from above, the longitudinal center portions of the bypasses 310 and 320, the overhead wire portions 2a of the two first wire rods 101 and 201, and the overhead wire portions 2b of the two second wire rods 102 and 202 are at the same position, respectively. It is preferable that the bypasses 310, 320 are arranged so that. By arranging bypasses of the same length on both sides of each overhead wire section 2a, 2b, it becomes easier for the current to move to the bypasses 310, 320, or to return to the bypasses 310, 320.

Further, the shape of the overhead wire sections 2a and 2b when the FFDS wire overhead wire body 1 is viewed from above is not particularly limited, and may be a straight line substantially perpendicular to the length direction of the FFDS wire overhead wire body 1; It may be omitted, or it may be curved. However, it is preferable that the shape of the overhead wire parts 2a and 2b is a straight line substantially perpendicular to the length direction of the FFDS wire overhead wire body 1. In this case, the critical current value (Ic) tends to become high. Furthermore, when the FFDS wire overhead wire body 1 is viewed in cross section, the width of the overhead wire portion 2a of the two first wire rods 101, 201 and the width of the overhead wire portion 2b of the two second wire rods 102, 202 are determined for the purpose of the present invention. There is no particular restriction as long as the effect is not impaired.

In addition, between the first wire rods 101, 201 (first stabilizing layer) and the first bypass 310 (first stabilizing layer), and between the first bypass 310 (metallic substrate) and the second bypass 320 (metallic substrate), Furthermore, between the second bypass 320 (second stabilizing layer) and the second wire rods 102, 202 (second stabilizing layer), a layer derived from molten solder, solder plating, indium plating, metal paste, etc. is usually used. is fixed.

- Second aspect In the second aspect shown in FIG. 2B, the overhead wire portions 2a of the two adjacent first wire rods 101 and 201 and the overhead wire portions 2b of the two adjacent second wire rods 102 and 202 are When you are in a remote location. Furthermore, a predetermined gap (a length indicated by L3 in FIG. 2B ) are spaced apart. In this way, the thickness of the overhead wire section 2 can be reduced by arranging the overhead wire sections 2a and 2b of the two wires at separate positions so that the first bypass 310 and the second bypass 320 do not overlap. Furthermore, by arranging the overhead wire parts 2a and 2b of each wire at separate positions, the critical current (Ic) across the two wires becomes comparable to that of the wires before connection, as shown in the example below. . Moreover, by setting it as such a structure, the FFDS wire becomes difficult to break at the overhead wire parts 2a and 2b of each wire, and the strength is also significantly increased. In this embodiment, the distance between the overhead wire portions 2a and 2b of the two wire rods (the length indicated by L1 in FIG. 2B) is preferably about 3 to 16 cm, more preferably 6 to 12 cm. When the distance L1 between the overhead wire portions 2a and 2b is 3 cm or more, the lengths of the first bypass 310 and the second bypass 320 can be made sufficiently long. On the other hand, when the distance L1 between the overhead wire sections 2a and 2b is 16 cm or less, there is an advantage that the length of the overhead wire section 2 does not become excessively long.

Furthermore, in this aspect, the lengths of the first bypass 310 and the second bypass 320 may be the same or different, but are preferably the same. Further, the length of the bypasses 310 and 320 (the length indicated by L2 in FIG. 2B) is usually preferably about 3 to 16 cm, more preferably about 6 to 12 cm. When the length of the bypasses 310, 320 is 3 cm or more, the current flowing through the first wires 101, 201 and the second wires 102, 202 tends to transfer to the bypasses 310, 320 or return. On the other hand, when the length of the bypasses 310 and 320 is 16 cm or less, the length of the overhead wire section 2 does not become excessively long.

Furthermore, when the overhead wire section 2 is viewed from above, the bypass 310 is arranged such that the central portion in the length direction of the bypass 310 and the overhead wire section 2a of the two first wire rods 101 and 201 are at the same position. It is preferable. Similarly, it is preferable that the bypass 320 is arranged such that the longitudinal center portion of the bypass 320 and the overhead wire portions 2b of the two second wire rods 102, 202 are located at the same position. By arranging bypasses of the same length on both sides of each overhead wire section 2a, 2b, it becomes easier for the current to move to the bypasses 310, 320, or to return to the bypasses 310, 320.

Here, the length L3 between the ends of the bypasses 310 and 320 is appropriately selected according to the distance L1 between the overhead wire sections 2a and 2b and the length L2 of each bypass 310 and 320.

In addition, in this aspect, between the first wire rods 101, 201 (first stabilizing layer) and the first bypass 310 (third stabilizing layer), between the first bypass 310 (third metal substrate) and the second wire rod 102, , 202 (second stabilizing layer), between the second bypass 320 (fourth metal substrate) and the first wire rods 101, 201 (first stabilizing layer), and further between the second bypass (fourth stabilizing layer). layer) and the second wire rods 102, 202 (second stabilizing layer) are usually fixed with a layer made of molten solder, solder plating, indium plating, metal paste, or the like.

- Third aspect Also in the third aspect shown in FIG. 2C, the overhead wire portions 2a of the two adjacent first wire rods 101 and 201 and the overhead wire portions 2b of the two adjacent second wire rods 102 and 202 are When you are in a remote location. Furthermore, the first bypass 310 and the second bypass 320 are arranged between the first wire rods 101, 201 and the second wire rods 102, 202 so as not to overlap, and the first bypass 310 and the second bypass 320 A spacer 330 is placed in between.

As described above, by arranging the overhead wire sections 2a and 2b of the two wire rods at separate positions so that the first bypass 310 and the second bypass 320 do not overlap, the overhead wire sections of the two FFDS wire rods 100 and 200 can be separated. The thickness of 2 can be made thinner. Furthermore, with such a configuration, the critical current (Ic) across the wire becomes approximately the same as that of the wire before connection, as shown in Examples described later. Moreover, by arranging the spacer 330 between the first bypass 310 and the second bypass 320, the FFDS wire becomes difficult to break between the overhead wire parts 2a and 2b, and the bending strength becomes good. In this embodiment, the distance L1 between the overhead wire portions 2a and 2b of the two wire rods and the length L2 of the first bypass 310 and the second bypass 320 can be the same as in the second embodiment.

In addition, the spacer 330 disposed between the first bypass 310 and the second bypass 330 may be of any type or structure, as long as it can fill the space between the first bypass 310 and the second bypass 320. Not restricted. However, it is preferable to have the same thickness as the first bypass 310 and the second bypass 320. Moreover, it is preferable that the first wire rods 101 and 201 and the second wire rods 102 and 202 are hardly affected, and it is preferable that the wire rods have the same structure as the first bypass 310 and the second bypass 320. At this time, the direction of the wire is not limited. Further, its length is appropriately selected depending on the distance L1 between the overhead wire portions 2a and 2b described above and the length L2 of each bypass 310 and 320.

In addition, also in this aspect, between the first wire rods 101, 201 (first stabilizing layer) and the first bypass 310 (third stabilizing layer), the first bypass 310 (third metal substrate) and the second wire rod 102 , 202 (second stabilizing layer), between the second bypass 320 (fourth metal substrate) and the first wire rods 101, 201 (first stabilizing layer), and further between the second bypass (fourth stabilizing layer). layer) and the second wire rods 102, 202 (second stabilizing layer) are usually fixed with a layer derived from molten solder, solder plating, indium plating, metal paste, etc., respectively. Further, the spaces between the spacer 330 and the first wire 201 and between the spacer 330 and the second wire 102 are also fixed with molten solder, solder plating, indium plating, a layer derived from metal paste, etc., respectively.

- Fourth aspect Also in the fourth aspect shown in FIG. 2D, the overhead wire portions 2a of the two adjacent first wire rods 101 and 201 and the overhead wire portions 2b of the two adjacent second wire rods 102 and 202 are When you are in a remote location. Furthermore, the end portion of the first bypass 310 and The first bypass 310 and the second bypass 320 are arranged such that the ends of the second bypass 320 are in contact with each other. Note that the ends of the first bypass 310 and the second bypass 320 only need to be partially in contact with each other when the FFDS wire overhead wire body 1 is viewed from above, but they should be connected so that there is no gap between them. It is more preferable that the

As described above, by arranging the overhead wire sections 2a and 2b of the two wire rods at separate positions so that the first bypass 310 and the second bypass 320 do not overlap, the overhead wire sections of the two FFDS wire rods 100 and 200 can be separated. The thickness of 2 can be made thinner. Furthermore, as in this embodiment, by arranging the first bypass 310 and the second bypass 320 so that they are in contact with each other, the critical current (Ic) that straddles the two wires can be Not only is the strength comparable to that of the wire, but the FFDS wire is less likely to break between the overhead wire portions 2a and 2b, and the bending strength is significantly higher. There is also an advantage that the length of the overhead wire section 2 is shorter than that of the overhead wire section 2 of the second embodiment or the third embodiment. In this embodiment, the distance L1 between the overhead wire portions 2a and 2b of the two wire rods and the length L2 of the first bypass 310 and the second bypass 320 can be the same as in the second embodiment.

In addition, also in this aspect, between the first wire rods 101, 201 (first stabilizing layer) and the first bypass 310 (third stabilizing layer), the first bypass 310 (third metal substrate) and the second wire rod 102 , 202 (second stabilizing layer), between the second bypass 320 (fourth metal substrate) and the first wire rods 101, 201 (first stabilizing layer), and further between the second bypass (fourth stabilizing layer). layer) and the second wire rods 102, 202 (second stabilizing layer) are usually fixed by molten solder, solder plating, indium plating, etc., respectively.

(Application)
The use of the above-mentioned FFDS wire overhead wire body is not particularly limited, but it can be applied to superconducting magnets (MRI, gantry, accelerator magnets, etc.), superconducting cables, superconducting rotating machines (motors, generators, etc.), power equipment, and various devices. It is possible.

(Effects of the laminated wire overhead wire body of the present invention)
Generally, when trying to connect two FFDS wires, it is conceivable to stack the metal plates of one of the FFDS wires by overlapping each other a certain distance and then connect them (see Comparative Example and FIG. 7A to be described later). However, in this method, the connection resistance at the overhead wire portion between the FFDS wires becomes extremely high, and this is not practical.

On the other hand, in the laminated wire overhead wire body of the present invention, two bypasses are arranged between two adjacent first wire rods and second wire rods in any of the above-mentioned overhead wire sections. Therefore, the current flowing through one of the first wires or one of the second wires can pass through the first bypass 310 or the second bypass 320 and transfer to the other first wire or the other second wire. In other words, the current flows around the overhead wire portion of each wire. In the FFDS wire overhead wire body of the present invention, the critical current (Ic) across the two wires is approximately the same as that of the wires before connection. As a result, in the laminated wire overhead wire body of the present invention, it is possible to keep the connection resistance of each overhead wire portion to about several tens of nΩ, and the critical current (Ic) can be kept at a practical level.

2. Manufacturing method of laminated wire overhead wire body The above-mentioned FFDS wire overhead wire body can be manufactured, for example, by the following manufacturing method. However, the method for manufacturing the FFDS wire overhead wire body is not limited to these.

As an example of the method for manufacturing the above-mentioned FFDS wire overhead wire body, a first elongated wire having a first superconducting layer containing a rare earth element, a second elongated wire having a second superconducting layer containing a rare earth element, A step of preparing a plurality of laminated wire rods (FFDS wire preparation step), a step of preparing a first bypass having a third superconducting layer containing a rare earth element, and a second bypass having a fourth superconducting layer containing a rare earth element. (bypass preparation step); a step of separating the first wire rod and the second wire rod at the end of one of the plurality of laminated wire rods (first separation step); A step of separating the first wire and the second wire at the ends of the laminated wires (second separation step), and a third superconducting layer of the first bypass facing the first superconducting layer of the two laminated wires. , a step of arranging the first bypass and arranging the second bypass so that the fourth superconducting layer of the second bypass faces the second superconducting layer of the two laminated wires (bypass arrangement step). Can be mentioned. Hereinafter, a method for manufacturing an FFDS wire overhead wire body having the above-described first to fourth overhead wire sections will be described.

- Method for manufacturing the FFDS wire overhead wire body of the first aspect A case of manufacturing an FFDS wire overhead wire body having the overhead wire section of the first aspect will be described based on FIGS. 3A to 3E. First, a plurality of the above-mentioned FFDS wire rods are prepared (FIG. 3A, FFDS wire preparation step). Specifically, the above-mentioned first wire rod and second wire rod (not shown) are produced and bonded together so that the superconducting layers face each other, and a plurality of FFDS wire rods (here, the first FFDS wire rod 100 and the 2 FFDS wire rod 200) is prepared. Subsequently, two similarly produced wire rods of a desired length are bonded together so that the metal plates face each other to prepare a first bypass 310 and a second bypass 320 (FIG. 3B, bypass preparation step).

Next, the first wire 101 and the second wire 102 at the end of the first FFDS wire 100 are separated. Similarly, the first wire 201 and the second wire 202 at the end of the second FFDS wire 200 are separated (FIG. 3C, first separation step and second separation step). The method for separating the first wire rods 101, 201 and the second wire rods 102, 202 is not particularly limited, and is appropriately selected depending on the type of intermediate connection layer connecting the first wire rods 101, 201 and the second wire rods 102, 202. be done. For example, if the intermediate connection layer is connected with solder or the like, it can be easily separated by applying heat to the intermediate connection layer.

Thereafter, the superconducting layer of the first bypass 310 faces the first superconducting layers of the two adjacent first wires 101 and 201, and the superconducting layer of the second bypass 320 faces the first superconducting layers of the two adjacent second wires 102 and 202. The first bypass 310 and the second bypass 320 are arranged so as to face the second superconducting layer, respectively (FIG. 3D, bypass arrangement step).

Thereafter, each layer is fixed with solder or the like to obtain an FFDS wire overhead wire body 1. Note that when connecting two or more FFDS wires, the same process is repeated.

- Method for manufacturing the FFDS wire overhead wire body according to the second aspect A case of manufacturing an FFDS wire overhead wire body having the overhead wire section according to the second aspect will be described based on FIGS. 4A to 4F. First, similarly to the first FFDS wire preparation step, a plurality of FFDS wires are prepared (FIG. 4A, FFDS wire preparation step). Subsequently, a first bypass 310 and a second bypass 320 (both wire rods) having desired lengths are prepared (FIG. 4B, bypass preparation step).

Next, the first wire 101 and the second wire 102 at the end of the first FFDS wire 100 are separated, and the length of the first wire 101 is set to be a predetermined length longer than the length of the second wire 102 (in FIG. 4D, L1) Cut a part of the first wire 101 so that it becomes shorter (left diagram in FIG. 4C and left diagram in FIG. 4D, first separation step). Further, the first wire 201 and the second wire 202 at the end of the second FFDS wire 200 are separated so that the length of the second wire 202 is a predetermined length longer than the length of the first wire 201 (in FIG. 4D L1) Cut a part of the second wire 202 so that it becomes shorter (right diagram in FIG. 4C, right diagram in FIG. 4D, second separation step). Note that the method for separating the first wire rods 101, 201 and the second wire rods 102, 202 is not particularly limited, and may be a method of applying heat to the intermediate connection layer, as in the first embodiment. Furthermore, the method for cutting the first wire 101 and the second wire 202 is not particularly limited, and any known method can be used.

After that, the first bypass 310 is arranged so that the superconducting layer of the first bypass 310 faces the two adjacent first wires 101 and 201, respectively. Similarly, the second bypass 320 is arranged so that the superconducting layer of the second bypass 320 faces the two adjacent second wires 102 and 202, respectively (FIGS. 4E and 4F, bypass arrangement step). At this time, as shown in FIG. 4E, a first bypass 310 is sandwiched between the first wire rod 101 and the second wire rod 102 of the first FFDS wire rod 100, and the first wire rod 201 and the second wire rod 102 of the second FFDS wire rod 200 are The second bypass 320 may be sandwiched between the two wire rods 202 and these may be overlapped.

Thereafter, each layer is fixed with solder or the like to obtain an FFDS wire overhead wire body 1. Note that when connecting two or more FFDS wires, the same process is repeated.

- Manufacturing method of FFDS wire overhead wire body according to the third embodiment A case in which an FFDS wire overhead wire body having the overhead wire section according to the third embodiment is manufactured is shown in FIGS. 5A to 5F. FIG. 5A shows the FFDS wire preparation process, FIG. 5B shows the bypass preparation process, and FIGS. 5C and 5D show the first separation process and the second separation process. These steps are the same as each step of the second embodiment. Further, the bypass placement process (FIGS. 5E and 5F) is also similar to the bypass placement process of the second embodiment, except that a spacer 330 is placed between the first bypass 310 and the second bypass 320. As the spacer 330, the first wire rod 101 and the second wire rod 201 which were cut in the first separation step or the second separation step may be cut into a desired length and used.

Thereafter, each layer is fixed with solder or the like to obtain an FFDS wire overhead wire body 1. Note that when connecting two or more FFDS wires, the same process is repeated.

- Method for manufacturing an FFDS wire overhead wire body according to the fourth aspect A case in which an FFDS wire overhead wire body having an overhead wire section according to the fourth aspect is manufactured is shown in FIGS. 6A to 6F. FIG. 6A shows the FFDS wire preparation process, FIG. 6B shows the bypass preparation process, and FIGS. 6C and 6D show the first separation process and the second separation process. These steps are the same as each step of the second embodiment. However, in this aspect, in the bypass preparation step, the first bypass 310 and the second bypass 320 are prepared which are longer than the desired length (FIG. 6B). Then, in the bypass arrangement step, the first bypass 310 is arranged so that the superconducting layer of the first bypass 310 faces the first superconducting layers of the two adjacent first wires 101 and 201, respectively. Similarly, the second bypass 320 is arranged so that the superconducting layer of the second bypass 320 faces the second superconducting layers of the two adjacent second wires 102 and 202 (FIGS. 6E and 6F). At this time, as shown in FIG. 6E, a first bypass 310 is sandwiched between the first wire rod 101 and the second wire rod 102 of the first FFDS wire rod 100, and the first wire rod 201 and the second wire rod 102 of the second FFDS wire rod 200 are When the second bypass 320 is sandwiched between the two wire rods 202 and then placed at a desired position, the first bypass 310 and the second bypass 320 partially overlap. Therefore, they are overlapped and cut to remove the excess first bypass 310 and second bypass 320. As a result, the first bypass 310 and the second bypass 320 do not overlap and their ends come into contact. Thereafter, each layer is fixed with solder or the like to obtain an FFDS wire overhead wire body. Note that when connecting two or more FFDS wires, the same process is repeated.

(Effects of the method for manufacturing a laminated wire overhead wire body of the present invention)
According to the method for manufacturing a laminated wire overhead wire body of the present invention, a plurality of FFDS wires can be connected by a simple method without using any special equipment. Further, according to this method, the critical current (Ic) across the two wires becomes comparable to that of the wires before connection. In other words, according to the method of manufacturing a laminated wire overhead wire body of the present invention, the connection resistance of each overhead wire section can be kept to about several tens of nΩ, and a very high quality laminated wire with a practical level of critical current (Ic) can be produced. Catenary wire bodies can be manufactured efficiently.

Hereinafter, the present invention will be explained in more detail with reference to Examples. However, the scope of the present invention is not limited thereby.

[Comparative example 1]
On one side of a tape-shaped first metal substrate made of Hastelloy C276 (registered trademark) with a width of 4 mm and a thickness of 40 μm, Gd ₂ Zr ₂ O ₇ (GZO) with a thickness of about 56 nm, Y ₂ O ₃ layers with a thickness of about 14 nm, and , an MgO layer with a thickness of approximately 5 nm, _three layers of LaMnO with a thickness of approximately 7 nm, and _two layers of CeO with a thickness of 600 to 900 nm were formed, and these were used as the first buffer layer. A first superconducting layer made of EuBa ₂ Cu ₃ O ₇ with a thickness of 1.6 μm was formed on the first buffer layer. Further, on the first superconducting layer, a silver film was formed as a first stabilizing layer to a thickness of 2 μm, and a copper film was further formed to a thickness of 5 μm, and this was used as a first wire material. Thereafter, a second wire was prepared in the same manner as the first wire. Then, gold nanopaste was applied onto the first stabilizing layer of the first wire. Then, the first wire rod and the second wire rod are stacked so that the first stabilizing layer of the first wire rod and the second stabilizing layer of the second wire rod face each other, and are connected by heat treatment at 150 ° C. for 2 hours, This was used as the first FFDS wire. A second FFDS wire was prepared in a similar manner.

Then, as shown in FIG. 7A, the first metal substrate (not shown) of the first FFDS wire 100 and the second metal substrate (not shown) of the second FFDS wire 200 are fixed with solder so that they overlap by 6 cm. did. Then, current terminals 900 (copper blocks) were placed at the ends of the first laminated wire 100 and the second laminated wire 200, and the current-voltage characteristics between the current terminals 900 were measured. The results are shown in Figure 7B. As can be read from FIG. 7B, the connection resistance was 1.9 μΩ, which was extremely high compared to the practical level.

[Example 1]
A first FFDS wire 100 and a second FFDS wire 200 were produced in the same manner as in Comparative Example 1 described above. In addition, two wire rods were manufactured in the same manner as the wire rod manufacturing method of Comparative Example 1 described above, and these were bonded together so that the metal substrates faced each other to form a first bypass and a second bypass.

Then, as shown in FIG. 3C, the first wire 101 and the second wire 102 at the ends of the first FFDS wire 100 were separated. Similarly, the first wire 201 and the second wire 202 at the ends of the second FFDS wire 200 were separated. Then, as shown in FIG. 3D, the first superconducting layers of the two first wires 101 and 201 and the superconducting layer of the first bypass 310 face each other, and the second superconducting layers of the two second wires 102 and 202 are further added. The first bypass 310 and the second bypass 320 were sandwiched and fixed with solder so that the superconducting layer of the second bypass 320 faced each other.

Regarding the FFDS wire overhead wire body, the current-voltage characteristics were measured in the same manner as in Comparative Example 1. The results are shown in Figure 8B. As can be read from FIG. 8B, the critical current Ic was 170 A and the connection resistance was 56 nΩ. In other words, in the FFDS connection wire, the connection resistance was significantly lower and the critical current Ic was higher than in Comparative Example 1, which was at a practical level.

[Example 2]
A first FFDS wire 100 and a second FFDS wire 200 were produced in the same manner as in Comparative Example 1 described above. In addition, two wire rods were manufactured in the same manner as the wire rod manufacturing method of Comparative Example 1 described above, and these were used as a first bypass and a second bypass.

Then, as shown in FIGS. 4C and 4D, the first wire 101 and the second wire 102 at the end of the first FFDS wire 100 are separated, and the length of the first wire 101 is longer than the length of the second wire 102. The first wire 101 was cut so as to be shorter by L1. On the other hand, the first wire 201 and the second wire 202 at the end of the second FFDS wire 200 are also separated, and the second wire 202 is separated so that the length of the second wire 202 is L1 shorter than the length of the first wire 201. Amputated. Then, as shown in FIGS. 4E and 4F, the first superconducting layer of the two first wires 101, 201 and the superconducting layer of the first bypass 310 face each other, and the first superconducting layer of the two second wires 102, 202 The first bypass 310 and the second bypass 320 were sandwiched and fixed with solder so that the two superconducting layers and the superconducting layer of the second bypass 320 faced each other. Thereafter, in the same manner as Comparative Example 1, the current-voltage characteristics were measured.

Furthermore, the distance L1 between the overhead wire portion 2a of the two first wire rods 101, 201 and the overhead wire portion 2b of the two second wire rods 102, 202, the length L2 of the first bypass 310 and the second bypass 320, and the length L2 of the first bypass 310 and the second bypass 320, and the first A plurality of FFDS wire overhead wire bodies were manufactured by changing the distance L3 from the end of the bypass 310 to the end of the second bypass 320. The results of Examples 2-1 to 2-3 are shown in FIGS. 9B to 9D. Table 1 also shows the values of connection resistance and critical current.

As shown in FIGS. 9B to 9D and Table 1 above, in all cases, the connection resistance was sufficiently low and the critical current (Ic) was at a practical level. In addition, from the results shown in Table 1, as L1, L2, and L3 became longer, the connection resistance decreased and the critical current Ic increased.

(Measurement of bending strength)
The bending strength of the FFDS wire overhead wire body of Example 2-4 was measured according to the following procedure. First, the current-voltage characteristics of a straight FFDS wire overhead wire body were measured. Then, as shown in FIG. 10A, the FFDS wire overhead wire body 1 was placed on the circumferential surface of the cylinder of a jig 910 having a cylinder of 100 mmφ. At this time, the position was adjusted so that the overhead wire section 2 of the FFDS wire overhead wire body 1 was in contact with the peripheral surface. Then, one end of the FFDS wire overhead wire body 1 was fixed to a jig 910, and a 5 kg weight A was attached to the other end. Thereafter, weight A was removed, and the current-voltage characteristics were measured in the bent state and at room temperature. Attachment and removal of weight A and measurement of current-voltage characteristics were performed for 5 cycles. As a result, in the FFDS wire overhead wire body, almost no change occurred in the critical current (Ic) even after 5 cycles.

Next, the diameters of the cylinders of the jig 910 were set to 90 mm, 80 mm, 70 mm, 60 mm, and 50 mm, and the current-voltage characteristics were similarly measured. Graphs showing the relationship between critical current (Ic) and cylinder diameter after 5 cycles are shown in FIGS. 10B and 10C. As shown in FIGS. 10B and 10C, there was almost no change in the critical current (Ic) up to a cylinder diameter of 80 mm, but when the diameter reached 70 mm, the critical current (Ic) tended to decrease. In addition, some peeling was observed in the overhead wire section 2 of the FFDS wire overhead wire body 1. Although the FFDS wire overhead wire body 1 having this structure has very good properties regarding connection resistance and critical current (Ic), the bending strength may sometimes be low.

[Example 3]
The FFDS wire overhead wire body 1 was constructed in the same manner as in Example 2-4 above, except that a spacer 330 (a wire rod in this example) having the same thickness as these was placed between the first bypass 310 and the second bypass 320. (Fig. 11A). Then, using the bending strength measurement jig 910 of Example 2, the current-voltage characteristics were measured in the same manner as in Example 2, with the diameters of the cylinders being 100 mm, 90 mm, 80 mm, 70 mm, 60 mm, and 50 mm. . The results are shown in FIGS. 11B and 11C. As shown in FIGS. 11B and 11C, in the FFDS wire overhead wire body 1 of this example, the decrease in critical current (Ic) was small even when the diameter was reduced. It is thought that the inclusion of the spacer improved the bending strength. However, when comparing the critical current (Ic) when the cylinder is straight and the critical current (Ic) when it is bent, the critical current (Ic) slightly decreases from the stage when the diameter of the cylinder is 100 mm.

[Example 4]
The FFDS wire catenary wire was used in the same manner as in Example 2-4 above, except that the first bypass 310 and the second bypass 320 were arranged so that the end of the first bypass 310 and the end of the second bypass 320 were in contact with each other. Body 1 was produced (FIG. 12A). Note that the distance L1 between the overhead wire portions 2a of the two first wire rods 101 and 201 and the overhead wire portion 2b of the two second wire rods 102 and 202 was 10 cm. Furthermore, the length L2 of the first bypass 310 and the second bypass 320 was also 10 cm. Regarding the FFDS wire overhead wire body 1, the current-voltage characteristics were measured using the bending strength measuring jig 910 in the same manner as in Example 2. The results are shown in Figures 12B and 12C. As shown in FIGS. 12B and 12C, even when the diameter of the bending strength measurement jig 910 becomes smaller, the critical current (Ic) decreases less, and the critical current (Ic) when bent is Even when compared with the critical current (Ic) when

[Example 5]
The structure of the overhead wire section was the same as in Example 4, and 23 FFDS wire rods with a single length of 100 to 150 m were connected to produce an FFDS wire overhead wire body with a total length of 1936 m. FIG. 13 shows the results of measuring the end-to-end critical current (Ic) of the FFDS wire overhead wire body. The FFDS wire overhead wire body had 22 connection points. Since the connection resistance over the entire length was 546 nΩ, the connection resistance was approximately 25 nΩ per point.

According to the present invention, a new laminated wire overhead wire body in which a plurality of laminated wires are connected without deteriorating the critical current (Ic) can be obtained. The superconductor can be applied to superconducting magnets, superconducting cables, power equipment, devices, and the like.

1 Laminated wire overhead wire body 2 Overhead line section 2a Overhead line section of first wire rod 2b Overhead line section of second wire rod 11a First metal substrate 11b Second metal substrate 12a First buffer layer 12a Second buffer layer 13a First superconducting layer 13b Second Superconducting layer 14a First stabilizing layer 14b Second stabilizing layer 15 Intermediate connection layer 100 First FFDS wire 101, 201 First wire 102, 202 Second wire 200 Second FFDS wire 310 First bypass 320 Second bypass 330 Spacer 900 Current terminal 910 Jig

Claims (11)

A plurality of laminated wire rods in which a first elongated wire rod having a first superconducting layer containing a rare earth element and a second elongated wire rod having a second superconducting layer containing a rare earth element are laminated in the length direction. It is a connected laminated wire overhead wire body,
The overhead wire portion between the laminated wire rods is formed between the first wire rod and the second wire rod,
a first bypass having a third superconducting layer containing a rare earth element and connecting two adjacent first wires;
a second bypass having a fourth superconducting layer containing a rare earth element and connecting two adjacent second wires;
has
The third superconducting layer of the first bypass is arranged to face the first superconducting layers of two adjacent first wires,
The fourth superconducting layer of the second bypass is arranged to face the second superconducting layers of two adjacent second wires,
Laminated wire overhead wire body. Each of the laminated wires includes, in this order, a first metal substrate, the first superconducting layer, a first stabilizing layer, an intermediate connection layer, a second stabilizing layer, the second superconducting layer, and a second metal substrate.
The laminated wire overhead wire body according to claim 1. The first bypass includes a third metal substrate, the third superconducting layer, and a third stabilizing layer in this order,
The second bypass includes, in this order, a fourth metal substrate, the fourth superconducting layer, and a fourth stabilizing layer.
The laminated wire overhead wire body according to claim 1 or 2. The overhead wire portions of the first wire rods and the overhead wire portions of the second wire rods are at different positions when viewed from above,
The laminated wire overhead wire body according to claim 1 or 2. the first bypass and the second bypass are arranged so as not to overlap;
The laminated wire overhead wire body according to claim 1 or 2. a spacer is arranged between the first bypass and the second bypass of each of the overhead wire sections;
The laminated wire overhead wire body according to claim 5. an end of the first bypass and an end of the second bypass are arranged so as to touch each other;
The laminated wire overhead wire body according to claim 5. preparing a plurality of laminated wire rods in which a first elongated wire rod having a first superconducting layer containing a rare earth element and a second elongated wire rod having a second superconducting layer containing a rare earth element are laminated;
preparing a first bypass having a third superconducting layer containing a rare earth element and a second bypass having a fourth superconducting layer containing a rare earth element;
separating the first wire rod and the second wire rod at an end of one of the plurality of laminated wire rods;
separating the first wire rod and the second wire rod at an end of another laminated wire rod among the plurality of laminated wire rods;
The first bypass is arranged such that the third superconducting layer of the first bypass faces the first superconducting layer of the two laminated wires, and the fourth superconducting layer of the second bypass faces the first superconducting layer of the two laminated wires. arranging the second bypass so as to face the second superconducting layer of one laminated wire;
including,
A method for manufacturing a laminated wire overhead wire body. In the step of separating the first wire rod and the second wire rod of the one laminated wire rod, after separating the first wire rod and the second wire rod, a part of the first wire rod is cut, and the first wire rod is separated from the first wire rod. shorten the length of
In the step of separating the first wire rod and the second wire rod of the other laminated wire rod, after separating the first wire rod and the second wire rod, a part of the second wire rod is cut and the second wire rod is separated. shorten the length of
In the step of arranging the first bypass and the second bypass, the first bypass and the second bypass are arranged so that they do not overlap;
A method for manufacturing a laminated wire overhead wire body according to claim 8. arranging a spacer between the first bypass and the second bypass in the step of arranging the first bypass and the second bypass;
The method for manufacturing a laminated wire overhead wire body according to claim 9. In the step of arranging the first bypass and the second bypass,
arranging the first bypass and the second bypass such that an end of the first bypass and an end of the second bypass are in contact with each other;
The method for manufacturing a laminated wire overhead wire body according to claim 9.

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