JP2011193607A - Intermediate connecting structure of superconductive cable power transmission line, and laying method of superconductive cable power transmission line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intermediate connecting structure of a superconductive cable power transmission line which is suitable for transmitting a low-voltage power, and can improve the degree of freedom of route design, and a laying method of the superconductive cable power transmission line. <P>SOLUTION: The intermediate connecting structure comprises cable cores 10a, 10b having superconductive bodies, and an intermediate connecting box 3a which connects the ends of the cable cores 10a, 10b. Then, the cable cores 10a, 10b are used for transmitting the low-voltage power. The intermediate connecting box 3a comprises a coolant vessel 30 which is filled with a coolant and accommodates the ends of the cable core 10a, 10b which are connected, and a connecting conductor 50 which is fixed into the coolant vessel 30, and connected with the ends of the cable cores 10a, 10b. Furthermore, the connecting conductor 50 electrically connects the ends of the cable cores 10a, 10b, and the advancing direction of the end of the cable core 10b on a demand side changes with respect to the advancing direction of the end of the cable core 10a on a power supply side via the connecting conductor 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an intermediate connection structure for a superconducting cable transmission line including a cable core having a superconducting conductor and an intermediate connection box for connecting ends of the cable core, and a method for laying the superconducting cable transmission line.

  Superconducting cables are expected as an energy-saving technology because they can transmit large amounts of power with low loss compared to existing normal conducting cables (eg, OF and CV cables). Recently, a demonstration test is being conducted in which a superconducting cable is installed and used for an actual transmission line.

A superconducting cable stores a cable core with a superconducting conductor in a heat insulating pipe (double corrugated pipe), and circulates a refrigerant (eg, liquid nitrogen (LN ₂ )) in the heat insulating pipe, thereby making the superconducting conductor superconductive. A structure that cools to a typical temperature is typical.

  In addition, the unit length of a superconducting cable is limited for reasons such as manufacturing, transportation, and installation. Therefore, when laying a superconducting cable transmission line over a long distance exceeding the unit length of the cable, an intermediate connection structure for connecting the superconducting cables to each other in the middle of the transmission line is required (for example, see Patent Documents 1 and 2). . Usually, this intermediate connection structure is constructed as follows. After laying the superconducting cable according to the route design of the power transmission line, the end of the cable core is pulled out from the end of the heat insulating tube of each superconducting cable to be connected. Next, the ends of the two cable cores drawn out are butted together to connect the superconducting conductors, and a reinforcing insulating layer is provided outside the connecting portion to form an intermediate connecting portion. And the refrigerant | coolant container which accommodates the intermediate connection part and the edge part of a cable core is attached, and an intermediate connection box is assembled.

JP 2005-251570 A JP 2006-221877 A

  In the conventional intermediate connection structure, the ends of the cable cores are butted against each other, so from the viewpoint of work, it is considered that the ends of the cable cores to be connected should be installed on the same straight line. It was done. That is, conventionally, the intermediate connection structure is not installed at the bent portion of the transmission line, and the intermediate connection structure is generally installed at the straight portion of the transmission line. On the other hand, in the route design of the power transmission line, when it is necessary to provide a bent portion in the middle of the power transmission line, this is dealt with by bending the intermediate portion of the superconducting cable with a radius of curvature greater than the allowable bending radius. However, the allowable bending radius of a general superconducting cable is about 5 m, and the curvature radius of the bent portion of the transmission line needs to be increased accordingly. For this reason, for example, a superconducting cable is not bent at right angles along the wall of a structure such as a building or a bridge, and a transmission line route is not designed in accordance with the structure.

In addition, at present, superconducting cables are mainly used for basic power transmission applications such as primary transmission lines from power plants to primary substations or secondary transmission lines from primary substations to secondary substations. . Therefore, since a high voltage (22 kV or more) is applied to the cable core, a reinforcing insulating layer is provided at a connection location between the ends of the cable core. In the future, in order to further reduce CO _2, it is considered to use superconducting cables for power distribution in industrial applications such as large buildings and factories that transmit low voltage (6.6 kV or less) after distribution substations. It is done. However, the use of superconducting cables for industrial power distribution applications has not been specifically studied.

  The present invention has been made in view of the above circumstances, and one of its purposes is an intermediate connection of superconducting cable transmission lines that is suitable for low-voltage power transmission applications and can improve the degree of freedom in route design. The object is to provide a structure and a method for laying a superconducting cable transmission line.

  The intermediate connection structure for a superconducting cable transmission line according to the present invention includes a cable core having a superconducting conductor and an intermediate connection box for connecting ends of the cable core. The cable core is for low-voltage power transmission. The intermediate connection box includes a refrigerant container that is filled with a refrigerant and accommodates an end portion of the cable core to be connected, and a connection conductor that is fixed in the refrigerant container and to which the end portion of the cable core is connected. Further, the connecting conductor electrically connects the ends of the cable cores, and through the connecting conductor, at least one on the demand side with respect to the traveling direction of the at least one cable core end on the power supply side. It is characterized in that the traveling direction of the two cable core ends changes.

  According to the intermediate connection structure of the present invention, the traveling direction of the cable core end on the demand side can be changed with respect to the traveling direction of the cable core end on the power supply side by the connection conductor of the intermediate connection box. Therefore, by installing the intermediate connection structure of the present invention at a predetermined position in the transmission line route, a bent portion is formed at that position, and the traveling direction of the transmission line can be arbitrarily changed. Further, the radius of curvature of the bent portion of the transmission line can be made smaller than the allowable bending radius of the superconducting cable, and the radius of curvature of the bent portion can be reduced as compared with the conventional case. Therefore, the degree of freedom in route design of the transmission line can be improved, and the route design according to the structure can be performed, so that it is particularly suitable for power distribution for industrial use such as large-scale buildings and factories. In addition, the low voltage power transmission referred to in the present invention means power transmission of 6.6 kV or less.

  In the present invention, the number of cable cores on the power supply side and the demand side connected via the connection conductor may be the same or different. That is, the number of cable cores on the power supply side versus the cable core on the demand side may be one-to-one or the same number of multiple-to-multiple correspondences, or may be one-to-multiple or vice versa. .

  In addition, since the cable core is for low-voltage power transmission, it is possible to ensure sufficient insulation by the refrigerant in the refrigerant container, and reinforcement insulation is provided outside the connection portion between the cable core end and the connection conductor. It is not always necessary to provide a layer. Therefore, the reinforcing insulating layer can be omitted or simplified, and the intermediate connection box (intermediate connection structure) can be reduced in size and simplified.

In the intermediate connection structure of the present invention, the form in which the traveling direction of the cable core end on the demand side changes with respect to the traveling direction of the cable core end on the power supply side includes the following forms.
Form 1: A form in which the traveling direction of the cable core end on the power supply side and the traveling direction of the cable core end on the demand side are shifted from each other and opposite to each other.
Form 2: Form in which the traveling direction of the cable core end on the power supply side intersects with the traveling direction of the cable core end on the demand side.
Form 3: The traveling direction of the cable core end on the power supply side and the traveling direction of the cable core end on the demand side are shifted from each other, and the extension direction in the traveling direction of the cable core end on the power supply side and the cable core on the demand side A form in which the direction of travel of the end is the same.

  When said form 1 is employ | adopted, the advancing direction of the cable core (superconducting cable) edge part of an electric power supply side and a demand side may become reverse direction, and a U-shaped bending part may be provided in the middle of a power transmission line. it can.

  When said form 2 is employ | adopted, the advancing direction of the cable core (superconducting cable) edge part of a power supply side and a demand side cross | intersects, and the bending part of arbitrary angles can be provided in the middle of a power transmission line. For example, when the traveling directions of the cable core ends on the power supply side and the demand side are orthogonal to each other, an L-shaped (right angle) bent portion can be provided in the middle of the transmission line.

  When the above form 3 is adopted, the traveling directions of the cable cores (superconducting cables) on the power supply side and the demand side are shifted from each other, and the traveling directions are the same, and a Z-shape is formed in the middle of the transmission line. A bent portion can be provided.

  Moreover, in said form 2, you may make it the advancing direction of the cable core edge part of a demand side cross | intersect three-dimensionally with respect to the advancing direction of the cable core edge part of an electric power supply side.

  In this case, the traveling direction of the other cable core (superconducting cable) end can be changed to the height direction with respect to the traveling direction of one cable core (superconducting cable), and the inclination or It is possible to cope with when it is necessary to provide a height difference. For example, the traveling direction can be changed from the horizontal direction to the vertical direction or vice versa by providing an L-shaped (right angle) bent portion so that the traveling directions of the two are orthogonal to each other.

  In the intermediate connection structure of the present invention, a mode including a hook attachment portion to which a hook for pulling the intermediate connection box is attached is preferable.

  In the present invention, the end of the cable core may be connected to the connection conductor, and the intermediate connection box may be assembled in advance, and then the intermediate connection box may be moved and installed at a predetermined position in the transmission line path. In this case, since the construction of the intermediate connection structure can be performed in a place where a sufficient work space can be secured, for example, it is possible to cope with a case where a sufficient work space cannot be secured in a predetermined position of the transmission line route, and workability is improved. The construction period can be shortened. According to the above configuration, when moving the intermediate connection box, it is possible to pull the intermediate connection box by attaching a hook to the hook mounting portion. Can be lifted or pulled into the pipeline with the intermediate junction box at the top.

  In the intermediate connection structure of the present invention, the refrigerant is filled into the refrigerant container when the refrigerant flows out of the refrigerant introduction port for supplying the refrigerant to the refrigerant container and the opening provided vertically above the refrigerant container. And a refrigerant discharge port for detecting that it has been performed.

  When there is a height difference in the transmission line route, it is considered that the intermediate connection structure of the present invention is installed at the highest position in the height direction. In this case, the refrigerant is supplied from the refrigerant container of the intermediate connection box, It is conceivable to distribute the refrigerant over the entire cable transmission line. According to the above configuration, the refrigerant is supplied from the refrigerant introduction port to introduce the refrigerant to the entire transmission line, and the refrigerant flows out from the refrigerant discharge port, so that it can be confirmed that the refrigerant has spread throughout the transmission line. .

On the other hand, the laying method of the superconducting cable transmission line of the present invention is characterized by comprising the following steps.
Connecting the end of the power supply side cable core having the superconducting conductor to the connecting conductor;
Connecting the end portion of the demand side cable core having the superconducting conductor to the connecting conductor so that the traveling direction changes with respect to the traveling direction of the end portion of the power supply side cable core;
A step of assembling the intermediate connection box by storing the ends of both cable cores in the refrigerant container and fixing the connection conductor in the refrigerant container in a state where the ends of both cable cores are connected to the connection conductor.
The step of moving the intermediate connection box and installing the intermediate connection box at a predetermined position of the transmission line.
A step of filling the refrigerant container with the refrigerant after installing the intermediate junction box.

  According to the laying method of the present invention, since the transmission line is laid in a state where the construction of the intermediate connection structure is completed, the construction of the intermediate connection structure can be performed in a place where a sufficient work space can be secured, It is possible to improve workability and shorten the construction period.

  The intermediate connection structure of the superconducting cable transmission line according to the present invention can change the traveling direction of the cable core end on the demand side with respect to the traveling direction of the cable core end on the power supply side. Improvements can be made. In particular, it is possible to design a route according to a structure, and is suitable for application to power distribution for industrial use such as large-scale buildings and factories that receive power at a low voltage.

  On the other hand, the method for laying a superconducting cable transmission line according to the present invention can improve the workability and shorten the construction period because the intermediate connection box is assembled in advance and installed at a predetermined position at the laying site.

It is a schematic sectional drawing which shows an example of the structure of the superconducting cable used for the intermediate | middle connection structure of this invention. It is a schematic front sectional drawing which shows the intermediate connection structure of the superconducting cable power transmission line which concerns on Embodiment 1 of this invention. FIG. 3 is a schematic side sectional view taken along line AA in FIG. 2. It is a schematic diagram explaining an example of the laying method of a superconducting cable power transmission line provided with the intermediate connection structure of Embodiment 1. (A) is a schematic diagram which shows the intermediate | middle connection structure of Embodiment 1, (B), (C) is a schematic diagram which shows the intermediate | middle connection structure of other embodiment. (D), (E) is a schematic diagram showing a modification of the intermediate connection structure according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Moreover, the same code | symbol is attached | subjected to the same member in the figure. Here, first, the structure of the superconducting cable used in the embodiment of the present invention will be described with reference to FIG. 1, and then the intermediate connection structure of the superconducting cable transmission line according to the embodiment of the present invention will be described with reference to FIGS. To explain.

  A superconducting cable 1 shown in FIG. 1 is a so-called three-core superconducting cable having a structure in which three-core cable cores 10 are twisted and accommodated together in a heat insulating tube 20. The heat insulating tube 20 is a corrugated tube having a double tube structure including an inner tube 21 and an outer tube 22, and a vacuum heat insulating layer is formed between both the tubes 21 and 22. You may arrange | position heat insulating materials, such as a super insulation (brand name), to this vacuum heat insulation layer. An anticorrosion layer 25 is formed on the outer peripheral surface of the outer tube 22.

  On the other hand, the cable core 10 has a structure in which a former 11, a superconducting conductor 12, an insulating layer 13, a shield layer 14, and a protective layer 15 are arranged in order from the center. The superconducting conductor 12 and the shield layer 14 are formed by winding a Bi2223 superconducting tape wire. The insulating layer 13 is formed by winding PPLP (registered trademark, Polypropylene Laminated Paper).

(Embodiment 1)
The intermediate connection structure of the superconducting cable transmission line according to the first embodiment of the present invention shown in FIGS. 2 and 3 includes the ends of the cable cores 10a and 10b of the superconducting cables 1a and 1b having the same structure as the superconducting cable 1 described above. An intermediate connection box 3a to be connected is provided. Here, superconducting cable 1a and superconducting cable 1b constitute a part of the transmission line, and power is transmitted from superconducting cable 1a (cable core 10a) on the power supply side toward superconducting cable 1b (cable core 10b) on the demand side. Is done. The superconducting cables 1a and 1b are 3.3 kV, 1000 A class power transmission cables.

  The cable cores 10a and 10b are for low-voltage power transmission. Further, the intermediate connection box 30a is filled with a refrigerant, the refrigerant container 30 in which the ends of the cable cores 10a and 10b to be connected are accommodated, and the ends of the cable cores 10a and 10b are fixed in the refrigerant container 30. And a connecting conductor 50 to be connected. Here, only one cable core is illustrated among the three cable cores 10a and 10b of the superconducting cables 1a and 1b.

  In this example, the end portions of the cable cores 10a and 10b are drawn out from the end portions of the heat insulation pipes 20 of the superconducting cables 1a and 1b, respectively, and the end portions of the heat insulation pipes 20 are provided in the refrigerant container 30. , 31b, the cable cores 10a, 10b are housed in the refrigerant container 30. The refrigerant container 30 is housed in the vacuum container 40, and a vacuum heat insulating layer is formed between the refrigerant container 30 and the vacuum container 40.

  The ends of the cable cores 10a and 10b accommodated in the refrigerant container 30 are stripped, the superconducting conductor 12 is exposed, and is connected to the connecting conductor 50. The connection conductor 50 is a copper member, and has a columnar base 51 and two connection portions 52 protruding in parallel from the base 51. Then, by connecting the superconducting conductor 12 of each cable core 10a, 10b to the connection portion 52 of the connection conductor 50, the ends of the cable cores 10a, 10b are electrically connected to each other by the connection conductor 50. Yes. Specifically, the superconducting conductor 12 of each cable core 10a, 10b and the connecting portion 52 of the connecting conductor 50 are connected via an attachment 53 (for example, multi-contact (trade name)). The attachment 53 is a cylindrical member made of copper, and has a first insertion hole into which the cable core former 11 can be inserted on one end side, and a second insertion into which the connection portion 52 of the connection conductor 50 can be inserted on the other end side. With holes. The inner peripheral surface of the first insertion hole of the attachment 53 is provided with a plurality of elastic contacts, and the elasticity of these elastic contacts holds the former 11 of the inserted cable core 10a (10b), and the superconducting conductor 12 The attachment 53 is soldered. Further, the second insertion hole of the attachment 53 has the same configuration as the first insertion hole, and holds the connection portion 52 of the inserted connection conductor 50. Thereby, the end portions of the cable cores 10a and 10b are electrically connected to the connection conductor 50 via the attachment 53, and the end portions of the cable cores 10a and 10b are electrically connected to each other by the connection conductor 50. It is connected.

  As shown in FIG. 3, there are the same number of connecting conductors 50 as the cable cores 10a and 10b of the superconducting cables 1a and 1b. The three connecting conductors 50 allow the corresponding cable cores of the superconducting cables 1a and 1b. The ends of 10a and 10b are electrically connected to each other. These connecting conductors 50 are collectively held at intervals by an insulating holding member 54 to ensure insulation between the connecting conductors 50, and this holding member 54 is fixed to the refrigerant container 30 with bolts. Thus, the refrigerant container 30 is fixed. In addition, a gap is formed between the ends of the cable cores 10a (10b) of the superconducting cable 1a (1b) at the connection point with the connection conductor 50, and the refrigerant container 30 is filled with the refrigerant, As a result, the cable cores 10a (10b) can be insulated from each other. For this reason, the reinforcing insulating layer is not provided outside the connection portion between the end portions of the cable cores 10a and 10b and the connection conductor 50.

  In addition, since the end portions of the cable cores 10a and 10b are connected to the connecting conductor 50, the traveling direction of the end portion of the cable core 10b is changed with respect to the traveling direction of the end portion of the cable core 10a. Specifically, the traveling direction of the end portion of the cable core 10a and the traveling direction of the end portion of the cable core 10b are shifted from each other and are opposite to each other (see FIG. 5A). Show directions). In this case, a U-shaped bent portion is provided at the installation position of the intermediate connection structure in the power transmission line.

  Further, the intermediate connection box 3a is provided with a refrigerant introduction port 32 for supplying the refrigerant to the refrigerant container 30, and a refrigerant discharge port 33 for detecting that the refrigerant is filled in the refrigerant container 30. Both the refrigerant introduction port 32 and the refrigerant discharge port 33 communicate with the refrigerant container 30 and open vertically above the refrigerant container 30.

  On the upper surface and the front surface of the vacuum vessel 40, a hook attachment portion 41 to which a hook that pulls the intermediate connection box 3a is attached is provided. On the other hand, leg portions 42 for fixing and installing the intermediate connection box 3a at predetermined positions are provided on the lower surface and the rear surface of the vacuum vessel 40. Further, a vacuum port 43 communicating with the vacuum heat insulating layer between the refrigerant container 30 and the vacuum container 40 is provided, and the vacuum heat insulating layer can be evacuated after assembling the intermediate connection box 3a.

  Next, an example of a method for laying a superconducting cable transmission line provided with the intermediate connection structure of the first embodiment will be described with reference to FIG.

  Here, as shown in FIG. 4, a U-shaped bent portion u is provided at the position of the mounting portion 110 that extends in the height direction from the ground and protrudes in the horizontal direction from the roof of the building 100, and returns to the ground again. Considering the transmission line route P, a case where a superconducting cable transmission line is laid according to this route design will be described as an example.

  First, the intermediate connection box 3a is assembled on the ground beforehand, and the intermediate connection structure is constructed. Specifically, the ends of the cable cores 10a and 10b are pulled out from the ends of the heat insulating tubes of the superconducting cables 1a and 1b, and the ends of the cable cores 10a and 10b are stripped to expose the superconducting conductor. Next, the ends of the cable cores 10a and 10b where the superconducting conductors are exposed are connected to the connection conductors 50, respectively. Next, with the ends of both cable cores 10a and 10b connected to the connection conductor 50, a refrigerant container is attached so as to accommodate the ends of both cable cores 10a and 10b, and the connection conductor 50 is placed inside the refrigerant container. To fix. Finally, a vacuum container is attached so as to accommodate the refrigerant container, and the intermediate connection box 3a is assembled.

  After assembling the intermediate connection box 3a, the hook is hooked on the hook mounting portion 41 provided on the upper surface of the intermediate connection box 3a (vacuum vessel 40), and the intermediate connection box 3a is lifted with a crane (in this example, It is installed on the mounting part 110) of the building 100, and the leg part 42 provided on the lower surface of the intermediate connection box 3a is fixed to the mounting part 110. Next, the refrigerant is supplied from the refrigerant introduction port 32 provided in the intermediate connection box 3a, and the refrigerant is distributed in the heat insulating pipes of the superconducting cables 1a and 1b, and the refrigerant container is filled with the refrigerant. Thus, the installation of the power transmission line in which the U-shaped bent portion is provided at the position of the mounting portion 110 where the intermediate connection structure is installed is completed.

  In this example, since the intermediate connection box 3a is installed at the highest position in the transmission line path P, the refrigerant can be distributed throughout the transmission line by supplying the refrigerant from the refrigerant inlet 32 of the intermediate connection box 3a. (See FIGS. 2 and 3). At that time, it can be confirmed that the refrigerant has spread over the entire transmission line by the refrigerant flowing out from the opening of the refrigerant discharge port 33 of the intermediate connection box 3a.

  By adopting such a laying method, the construction of the intermediate connection structure can be performed on the ground where a sufficient work space can be secured, so even when a sufficient work space cannot be secured on the mounting part 110 of the building 100 It is possible to cope with it, improving workability and shortening the construction period. It is also possible to take a branch from the intermediate connection box 3a of Embodiment 1 and distribute power from the roof to each floor of the building.

(Other embodiments)
An intermediate connection structure according to another embodiment different from the intermediate connection structure according to the first embodiment will be described.

  The intermediate connection structure according to the embodiment shown in FIG. 5B is different from the intermediate connection structure of the first embodiment in the connection form between the end portions of the cable cores 10a and 10b and the connection conductor 50. This is an example in which the traveling direction of the cable core 10b and the traveling direction of the end portion of the cable core 10b intersect each other (the arrow in the figure indicates the traveling direction of the cable core end portion. In the intermediate connection box 3b, the connection portions of the connection conductors 50 are arranged in an L shape, and the end portions of the cable cores 10a and 10b are connected to the connection conductors 50, so that the end portions of the cable cores 10a are connected. The traveling direction and the traveling direction of the end portion of the cable core 10b are orthogonal to each other. In this case, an L-shaped bent portion is provided at the installation position of the intermediate connection structure in the transmission line. For example, the cable cores 10a and 10b can be arranged on the same horizontal plane, and an L-shaped bent portion can be provided in the middle of the transmission line laid in the horizontal direction.

  In this example, it is also possible to install the intermediate connection box 3b so that the traveling direction of the cable core 10b end portion three-dimensionally intersects with the traveling direction of the cable core 10a end portion. In this case, the traveling direction of the cable core 10b end can be changed to the height direction with respect to the traveling direction of the cable core 10a end, and this corresponds to the case where a height difference needs to be provided in the middle of the transmission line. Can do. For example, when there is a vertical difference in the middle of the transmission line route, the traveling direction can be changed from the horizontal direction to the vertical direction or vice versa by installing this intermediate connection box 3b at the position where the height difference is provided. it can. In particular, it can be suitably used when laying power transmission lines along the wall surfaces of structures such as buildings and bridges.

  In the intermediate connection structure according to the embodiment shown in FIG. 5C, the connection form between the end portions of the cable cores 10a and 10b and the connection conductor 50 is such that the traveling direction of the end portion of the cable core 10a and the end portion of the cable core 10b are the same. In this example, the traveling directions are shifted from each other, and the extending direction of the cable core 10a end and the cable core 10b end are the same. In the intermediate connection box 3c, the connection portions of the connection conductors 50 are arranged in opposite directions and in parallel. In this case, a Z-shaped bent portion is provided at the installation position of the intermediate connection structure in the power transmission line.

  The intermediate connection structure according to the embodiment of the present invention described above can improve the degree of freedom of design of the transmission line route, and also enables route design according to the structure. Suitable for power distribution in industrial applications such as factories.

  Note that the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. For example, in the above-described embodiment, the case where the number of cable cores on the power supply side and the demand side is the same has been described as an example, but the number of cable cores on the power supply side and the demand side may be different.

  In the intermediate connection structure according to the modification of the embodiment shown in FIG. 6 (D), the connection conductor 50 includes the end of one cable core 10a on the power supply side and the end of the two cable cores 10b on the demand side. This is an example of connection. In the intermediate connection box 3d, the three connection portions of the connection conductor 50 are arranged in a Y shape, and the end portions of the cable core are connected to each other, so that the Y position is set at the installation position of the intermediate connection structure in the transmission line. Can be provided. In this example, the connecting portion of the connecting conductor 50 is arranged in a Y shape, but the connecting portion may be arranged in a T shape to realize a T-shaped branch portion. Further, the connecting portion connected to the end portion of the cable core 10a may be changed. Further, each cable core end is connected to the connecting conductor so that the traveling direction of at least one other cable core end is changed to the height direction with respect to the traveling direction of at least one cable core end. May be.

  In the intermediate connection structure according to the modification of the embodiment shown in FIG. 6E, the end portions of the two cable cores 10a on the power supply side and the end portions of the two cable cores 10b on the demand side are connected conductors 50. This is an example of connection. In the intermediate connection box 3e, the four connection portions of the connection conductor 50 are arranged in an H shape, and the end portions of the cable core are connected to each other, so that the intermediate connection structure in the transmission line has an H shape. Can be provided. In this example, the connecting portion of the connecting conductor 50 is arranged in an H shape, but the connecting portion is arranged in an X shape (cross shape) to realize an X shape (cross shape) branching portion. May be. Further, each cable core end is connected to the connecting conductor so that the traveling direction of at least one other cable core end is changed to the height direction with respect to the traveling direction of at least one cable core end. May be.

  The intermediate connection structure of the superconducting cable transmission line and the method for laying the superconducting cable transmission line of the present invention can be suitably used in the field of power distribution for industrial use such as large-scale buildings and factories.

1,1a, 1b Superconducting cable
10,10a, 10b Superconducting cable core
11 Former 12 Superconducting conductor 13 Insulating layer
14 Shield layer 15 Protective layer
20 Insulated pipe
21 Inner tube 22 Outer tube 25 Anticorrosion layer
3a, 3b, 3c, 3d, 3e Intermediate connection box
30 Refrigerant container
31a, 31b Cable inlet
32 Refrigerant inlet 33 Refrigerant outlet
40 vacuum vessel
41 Hook mounting part 42 Leg part 43 Vacuum port
50 Connecting conductor
51 Base 52 Connection 53 Attachment
54 Holding member
100 Building 110 Placement
P Transmission line path u Curved part

Claims (8)

An intermediate connection structure of a superconducting cable transmission line comprising a cable core having a superconducting conductor and an intermediate connection box for connecting ends of the cable cores,
The cable core is for low-voltage power transmission,
This intermediate connection box
A refrigerant container filled with a refrigerant and containing an end of the connected cable core; and
A connecting conductor fixed in the refrigerant container and connected to an end of the cable core;
With
The connection conductor electrically connects the ends of the cable core;
A superconducting cable transmission line characterized in that the traveling direction of at least one cable core end on the demand side changes via the connecting conductor with respect to the traveling direction of at least one cable core end on the power supply side. Intermediate connection structure.   The intermediate direction of the superconducting cable transmission line according to claim 1, wherein the traveling direction of the cable core end portion on the power supply side and the traveling direction of the cable core end portion on the demand side are shifted from each other and opposite to each other. Connection structure.   The intermediate connection structure of a superconducting cable transmission line according to claim 1, wherein a traveling direction of the cable core end on the power supply side intersects a traveling direction of the cable core end on the demand side.   The traveling direction of the cable core end on the power supply side and the traveling direction of the cable core end on the demand side are shifted from each other, and the extending direction of the traveling direction of the cable core end on the power supply side and the cable on the demand side The intermediate connection structure for a superconducting cable transmission line according to claim 1, wherein the traveling direction of the core end portion is the same direction.   The intermediate direction of the superconducting cable transmission line according to claim 3, wherein the traveling direction of the cable core end portion on the demand side three-dimensionally intersects with the traveling direction of the cable core end portion on the power supply side. Connection structure.   The intermediate connection structure for a superconducting cable transmission line according to any one of claims 1 to 5, further comprising a hook attachment portion to which a hook that pulls the intermediate connection box is attached. A refrigerant inlet for supplying the refrigerant to the refrigerant container;
An opening provided vertically above the refrigerant container, and a refrigerant discharge port for detecting that the refrigerant is filled in the refrigerant container when the refrigerant flows out of the opening;
The intermediate connection structure of the superconducting cable transmission line according to any one of claims 1 to 6, wherein the intermediate connection structure is provided. Connecting the end of the cable core on the power supply side having the superconducting conductor to the connecting conductor;
Connecting the end of the demand-side cable core having a superconducting conductor to the connecting conductor such that the traveling direction changes with respect to the traveling direction of the end of the power supply-side cable core;
With the ends of both cable cores connected to the connection conductor, the ends of the cable cores are housed in a refrigerant container, the connection conductor is fixed in the refrigerant container, and an intermediate connection box is assembled. Process,
Moving the intermediate connection box and installing the intermediate connection box at a predetermined position of a power transmission line;
After installing the intermediate junction box, filling the refrigerant container with a refrigerant;
A method for laying a superconducting cable transmission line, comprising:

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