JP5742006B2 - End structure of room temperature insulated superconducting cable - Google Patents

Description

  The present invention relates to a terminal structure of a room temperature insulated superconducting cable.

  A superconducting cable is expected as an energy-saving technology because it can transmit large-capacity power with low loss compared to existing power cables (eg, normal conducting cables such as CV cables and OF cables). Recently, a superconducting cable is laid on a line simulating a real line, and a demonstration test is being promoted for practical use.

In a superconducting cable, a conductor portion (so-called cable core) having an electric insulation layer on the outer periphery of the superconducting conductor layer is housed in a refrigerant pipe, and the electric insulation layer is also cooled to the temperature of the refrigerant (eg, liquid nitrogen (LN ₂ )). A low-temperature insulation type (see, for example, paragraph 0004 of Patent Document 1) and a conductor portion that does not have an electric insulation layer on the outer periphery of the superconducting conductor layer are accommodated in the refrigerant pipe, and an electric insulation layer is provided on the outer circumference of the refrigerant pipe Is formed, and the electrical insulating layer is maintained at room temperature, and is of a room temperature insulation type (see, for example, paragraph 0003 of Patent Document 1). For example, a double-pipe heat insulation pipe having an inner pipe and an outer pipe is used as the refrigerant pipe. In order to improve heat insulation, the space between the inner pipe and the outer pipe is evacuated. A vacuum heat insulating layer is formed, and furthermore, a heat insulating material such as super insulation is disposed on the vacuum heat insulating layer.

  By the way, when constructing | assembling a track | line using a superconducting cable, the terminal structure (terminal connection part) which connects a superconducting cable and a normal-conductivity power apparatus (for example, a normal-conducting cable) is required in the terminal of a superconducting cable. The terminal structure of the above-described low-temperature insulated superconducting cable is disclosed in Patent Document 2, for example. In this terminal structure, the conductor of the bushing (leading conductor) is connected to the conductor (superconducting conductor layer) exposed by processing the end of the superconducting cable, and current is passed from the cryogenic temperature side to the room temperature side through this bushing. It is a structure to pull out. The bushing has a conductor made of a normal conducting material inside, one end of the conductor is connected to the conductor portion of the superconducting cable, and the other end is drawn to the room temperature side. The terminal structure projects into one end side of the bushing conductor (side connected to the conductor portion of the superconducting cable), a vacuum container covering the outer periphery of the refrigerant tank, and a room temperature side of the vacuum container. The other end side of the bushing is housed in the soot tube, and the other end of the conductor passes through the soot tube and is drawn out to the room temperature side.

JP-A-8-64041 JP 2005-117724 A

  In putting the superconducting cable into practical use, it is conceivable to replace the existing installed power cable with a superconducting cable. However, in the case of a room temperature insulated superconducting cable, no specific terminal structure has been proposed in the past.

  In addition, when the same structure as the terminal structure of the above-mentioned low-temperature insulated superconducting cable is adopted as the terminal structure of the room temperature insulated superconducting cable, the existing terminal equipment such as a pipe used for the terminal structure of the power cable is used as it is. There is a possibility that it cannot be used. Specifically, when power corresponding to the capability of the superconducting cable is transmitted, a large current flows through the lead conductor, and the Joule loss in the lead conductor becomes very large. In order to avoid this, it is conceivable to increase the cross-sectional area (outer diameter) of the lead conductor to reduce the electrical resistance of the lead conductor, but in that case, the diameter of the soot tube that accommodates the lead conductor is also increased. Therefore, when the conventional terminal structure technology is applied, it is difficult to reduce the size, and it is necessary to design and construct a new terminal structure including a pipe.

  Accordingly, one of the objects of the present invention is to provide a terminal structure that can be miniaturized and is suitable for a room temperature insulated superconducting cable.

  The terminal structure of the room-temperature insulated superconducting cable of the present invention is a terminal structure that connects the terminal of the room-temperature insulated superconducting cable and the lead conductor drawn to the room temperature side. A room-temperature insulated superconducting cable (hereinafter sometimes simply referred to as a “superconducting cable”) includes a conductor part having a superconducting conductor layer, a refrigerant pipe that houses the conductor part and through which a refrigerant that cools the superconducting conductor layer flows, An electrical insulating layer formed on the outer periphery of the refrigerant pipe. And this terminal structure covers the outer periphery of the terminal of the superconducting cable and is arranged in a state where the conductor part at the tip of the terminal is exposed to the outside, the conductor part exposed to the outside from the pipe, and the lead conductor And a refrigerant tank which is joined to the refrigerant pipe so as to cover the outer periphery of the connection part and accommodates the connection part.

  According to this structure, the conductor part in the front-end | tip part of the terminal of the said cable is exposed outside from the soot pipe which covers the outer periphery of the terminal of a superconducting cable, and the connection part of this conductor part and an extraction conductor is provided in the exterior of a soot pipe. Therefore, even if the outer diameter of the lead conductor is increased, it is not necessary to increase the outer diameter of the soot tube, and the outer diameter of the soot tube can be reduced. Therefore, it is possible to reduce the size of the terminal structure, and when constructing the terminal structure, it is possible to use a part of the existing power cable terminal equipment (for example, a pipe) as it is, so that the installation cost of the superconducting cable can be reduced. Can be reduced.

  As one form of the terminal structure of the room-temperature insulated superconducting cable of the present invention, the refrigerant tank is joined to a branch refrigerant pipe that communicates with the side surface of the refrigerant tank and branches in a direction different from the drawing direction of the drawing conductor. It may be provided with a refrigerant conduction port.

  According to this structure, the refrigerant | coolant which distribute | circulates through the refrigerant | coolant piping of a superconducting cable can be pulled out from a terminal through a refrigerant | coolant conduction | electrical_connection opening in the direction different from the drawing-out direction of an extraction | drawer conductor. When power is transmitted by installing a superconducting cable, for example, the refrigerant drawn from the terminal on one end side is sent to the cooling system provided outside via the branch refrigerant pipe, and the refrigerant whose temperature has increased by circulating through the refrigerant pipe is used. After cooling to a predetermined temperature, the cooled refrigerant can be returned to the refrigerant pipe from the terminal on the other end side, and the refrigerant can be circulated.

  As one form of the terminal structure of the room-temperature insulated superconducting cable of the present invention, a vacuum tank covering the outer periphery of the refrigerant tank is further provided, and the side of the vacuum tank communicates with the vacuum tank, It is possible to provide a vacuum drawing port for vacuuming.

  According to this configuration, by providing the vacuum tank on the outer periphery of the refrigerant tank, the inside of the vacuum tank (the space between the refrigerant tank and the vacuum tank) can be evacuated to further enhance the heat insulation of the refrigerant tank. .

  As one form of the terminal structure of the room-temperature insulated superconducting cable of the present invention, the refrigerant tank is formed extending from the connecting portion to the lead conductor side, and the distance between the lead conductor and the refrigerant tank is 0.1 mm or more and 2.5 mm or less. There are some.

When the refrigerant in the refrigerant tank is maintained in a liquid state, the temperature gradient from the cryogenic temperature side to the normal temperature side cannot be sufficiently obtained, and the sealing member that seals the refrigerant tank may be excessively cooled and deteriorated. Therefore, the inside of the refrigerant tank is divided into a liquid refrigerant (eg, liquid nitrogen (LN ₂ )) and a gas refrigerant (eg, nitrogen gas (GN ₂ )). It is conceivable to fill the gas refrigerant with the gas refrigerant. Here, when the interval between the outer peripheral surface of the lead conductor and the inner peripheral surface of the refrigerant tank is increased, it is necessary to pressurize the gas refrigerant with a pressurizer in order to secure a region for the gas refrigerant. On the other hand, according to the above configuration, the space between the lead conductor and the refrigerant tank is reduced to 0.1 mm or more and 2.5 mm or less, so that the area of the gas refrigerant is secured without being pressurized by the pressurizer, and the gas refrigerant And the pressure of the liquid refrigerant are balanced, and the liquid level of the liquid refrigerant in the refrigerant tank is easily stabilized. Further, by reducing the interval, the volume of the gap between the lead conductor and the refrigerant tank is reduced, and heat intrusion is easily suppressed.

  As one form of the terminal structure of the room temperature insulation type superconducting cable of the present invention, two superconducting cables are laid, and on the side surface of the refrigerant tank in each terminal structure provided at the terminal on the same one end side of both superconducting cables, A refrigerant conduction port is provided that communicates with the refrigerant tank and is joined to a branch refrigerant pipe that branches in a direction different from the drawing direction of the drawing conductor. And it is mentioned that the refrigerant | coolant conduction | electrical_connection openings in each terminal structure are connected via the said branch refrigerant | coolant piping.

  According to this configuration, first, since two superconducting cables are laid, each superconducting cable can share current, and each superconducting cable can be downsized by reducing the current capacity per one piece. Is possible. Next, the refrigerant conduction ports in each terminal structure are connected via the branch refrigerant pipe, so that the refrigerant flowing through the refrigerant pipe of one superconducting cable and the refrigerant flowing through the refrigerant pipe of the other superconducting cable Can be shared. Specifically, when the refrigerant flowing through the refrigerant pipe of one superconducting cable flows from the other end side to the one end side, this refrigerant is sent to the refrigerant pipe of the other superconducting cable via the branch refrigerant pipe, and the other end By flowing from the side to the one end side, the refrigerant of both superconducting cables can be shared. Thereby, a cooling system can also be made common and the installation space of a cooling system can be reduced. In the above case, the cooling system is installed on the other end of both superconducting cables, the refrigerant returned through the refrigerant piping of the other superconducting cable is sent to the cooling system, cooled by the cooling system, and then again one superconducting cable The refrigerant piping can be supplied and circulated.

  The terminal structure of the room temperature insulation type superconducting cable of the present invention is such that the lead conductor is attached to the conductor portion exposed to the outside from the soot tube, and the connecting portion between the conductor portion and the lead conductor is provided outside the soot tube, Small in diameter and can be miniaturized. Accordingly, terminal equipment such as a soot pipe used in the existing power cable terminal structure can be used as it is, and the installation cost of the superconducting cable can be reduced.

It is a schematic sectional drawing which shows typically an example of a normal temperature insulated superconducting cable. 1 is a partially cutaway cross-sectional view showing an overall schematic configuration of a terminal structure of a room temperature insulated superconducting cable according to Embodiment 1. FIG. 4 is a half cross-sectional view showing a schematic configuration of a main part of a terminal structure of a room temperature insulated superconducting cable according to Embodiment 1. FIG. 6 is a partially cutaway cross-sectional view showing an overall schematic configuration of a terminal structure of a room temperature insulated superconducting cable according to Embodiment 2. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same reference numerals are used for the same or corresponding members.

(Embodiment 1)
First, a room temperature insulated superconducting cable will be described with reference to FIG. A superconducting cable 200 shown in FIG. 1 is a cable in which a conductor 210 having a superconducting conductor layer 212 is accommodated in a refrigerant pipe 213. The superconducting conductor layer 212 is cooled by the refrigerant 214, and the electric insulating layer 215 is cooled by the refrigerant 214. It is a configuration that is not. Here, a single-core cable in which one conductor portion 210 is accommodated in the refrigerant pipe 213 is shown.

  The conductor part 210 typically includes a former 211, a superconducting conductor layer 212, and a protective layer (not shown) in order from the center. The former 211 is a member used for a support for the superconducting conductor layer 212 and a flow path for an abnormal current (such as a short circuit current), and is formed of a normal conductor such as copper or aluminum. More specifically, for example, solid bodies such as a stranded wire obtained by twisting a plurality of metal wires having an insulating coating such as enamel, and a hollow body such as a spiral pipe formed by spirally forming a metal pipe or a metal strip. . When a hollow body such as a metal pipe is used, the internal space can be used as a refrigerant flow path.

  For the superconducting conductor layer 212, for example, a tape-shaped wire having an oxide superconductor can be suitably used. Tape-like wires include, for example, Bi2223 series superconducting tape wires (sheath wires in which filaments made of oxide superconductors are arranged in a stabilizing metal such as Ag-Mn or Ag), RE123 thin film wires (RE: rare earth elements ( For example, Y, Ho, Nd, Sm, Gd, etc.) (Laminated wire in which an oxide superconducting phase is formed on a metal substrate). The superconducting conductor layer 212 includes a single layer structure or a multilayer structure formed by spirally winding the tape-shaped wire. In this example, the superconducting conductor layer 212 has a multilayer structure (see FIGS. 2 and 3). The protective layer is for protecting the superconducting conductor layer 212, and includes a configuration in which kraft paper or the like is wound.

  In the refrigerant pipe 213 that houses the conductor portion 210, a refrigerant 214 (typically liquid nitrogen or liquid helium) for cooling the superconducting conductor layer 212 and maintaining it in a superconducting state circulates. Function. This refrigerant pipe 213 has a double pipe structure vacuum having an inner pipe 213i and an outer pipe 213o made of metal such as stainless steel, aluminum or an alloy thereof, and a vacuum heat insulating layer is formed between the pipes 213i and 213o. It is an insulated pipe. In this example, each of the inner tube 213i and the outer tube 213o is corrugated. Moreover, if a heat insulating material such as super insulation is disposed in the vacuum heat insulating layer, the heat insulating property can be enhanced. If a spacer is disposed between the inner tube 213i and the outer tube 213o, contact between the two tubes 213i and 213o can be prevented, heat intrusion from the contact portion can be prevented, and heat insulation can be improved.

  In the superconducting cable 200, an electric insulating layer 215 is formed on the outer periphery of the refrigerant pipe (vacuum heat insulating pipe) 213. Since the electrical insulation layer 215 is used in a normal temperature environment, its constituent materials are materials with excellent electrical insulation strength that have been proven in ordinary conductive cables, typically cross-linked polyethylene (XLPE) used for CV cables. Available. An insulating resin such as cross-linked polyethylene is excellent in manufacturability of a superconducting cable because the electric insulating layer 215 can be easily formed on the refrigerant pipe 213 by extrusion. Although not shown, a shield such as copper or aluminum or a sheath such as vinyl or polyethylene is applied on the electrical insulating layer 215. This shielding mainly functions as an electric field shielding layer, while the sheath functions as a mechanical protective layer.

  Next, with reference to FIGS. 2 and 3, the terminal structure of the room temperature insulated superconducting cable will be described. The terminal structure 100 shown in FIGS. 2 and 3 is a terminal structure for connecting the terminal of the superconducting cable 200 and the lead conductor 110 drawn to the room temperature side. The conductor part 210 at the tip of the terminal is exposed to the outside, and the connection part 130 between the conductor part 210 and the lead conductor 110 is provided outside the soot tube 120.

  The lead conductor 110 is a member that is electrically connected to the conductor portion 210 (superconducting conductor layer 212) at the end of the end of the superconducting cable 200 and is used for drawing current from the cryogenic temperature side to the room temperature side. As the lead conductor 110, for example, a rod-like body or a tubular body formed of a normal conductor such as copper or aluminum can be used. In this example, the lead conductor 110 is a copper rod-like body, and an insertion hole into which the conductor portion 210 is inserted is formed on one end side.

  The soot tube 120 is a member that is disposed in a state in which the terminal of the superconducting cable 200 is inserted, covers the outer periphery of the terminal of the superconducting cable 200, and the conductor part 210 at the tip of the terminal is exposed to the outside. The soot tube 120 may be made of, for example, porcelain, polymer, or resin (for example, epoxy resin). In this example, the insulator tube 120 is made of porcelain, and is supported via a support insulator 122 on a bottom plate 121 attached to a portion having the electric insulation layer 215 of the superconducting cable 200 (see FIG. 2). In addition, an electric field shield ring 125 is provided at the tip of the soot tube 120.

  At the end of the superconducting cable 200, the electric insulation layer 215 is removed and the refrigerant pipe 213 is exposed, and the conductor portion 210 drawn out from the end of the refrigerant pipe 213 is stripped at the tip, and the conductor portion 210 is removed. The superconducting conductor layer 212 and the former 211 are exposed. Then, a conductor 210 (former 211 and superconducting conductor layer 212) exposed in an insertion hole formed on one end side of the lead conductor 110 is inserted, and one end side of the lead conductor 110 is caulked to join the former 211, By connecting the superconducting conductor layer 212 to the insertion hole of the lead conductor 110 by soldering, a connection portion 130 that electrically connects the conductor portion 210 (superconducting conductor layer 212) and the lead conductor 110 is formed.

  The refrigerant tank 140 is a member that is joined to the refrigerant pipe 213 (inner pipe 213i (see FIG. 3)) so as to cover the outer periphery of the connection part 130, and stores the connection part 130. The refrigerant tank 140 is internally (the connection part 130 and the refrigerant tank 140). ) Is filled with the refrigerant flowing through the refrigerant pipe 213. For the refrigerant tank 140, for example, a cylindrical body formed of a metal such as stainless steel, aluminum, or an alloy thereof can be used. In this example, on the side surface of the refrigerant tank 140, there is provided a refrigerant conduction port 141 that communicates with the refrigerant tank 140 and is joined to a branch refrigerant pipe 145 that branches in a direction different from the drawing direction of the lead conductor 110. .

  Furthermore, a vacuum tank 150 that covers the refrigerant tank 140 is provided on the outer periphery of the refrigerant tank 140. The vacuum tank 150 is a member that is joined to the refrigerant pipe 213 (outer pipe 213o (see FIG. 3)) and insulates the refrigerant tank 140. Similar to the refrigerant tank 140, for example, a cylindrical body formed of a metal such as stainless steel, aluminum, or an alloy thereof can be used for the vacuum tank 150. In this example, a vacuum suction port 151 for communicating with the inside of the vacuum tank 150 (the space between the refrigerant tank 140 and the vacuum tank 150) on the side surface of the vacuum tank 150 and evacuating the vacuum tank 150 is provided. Is provided. By evacuating the vacuum tank 150 to form a vacuum heat insulating layer, the heat insulating property of the refrigerant tank 140 is enhanced. Further, an opening is provided on the side surface of the vacuum tank 150 at a position corresponding to the refrigerant conduction port 141 of the refrigerant tank 140, and the branch refrigerant pipe 145 is joined to the refrigerant tank 140 through this opening. In the vacuum chamber 150, similarly to the refrigerant pipe 213, a heat insulating material (not shown) such as super insulation is arranged, or a spacer (not shown) for preventing the refrigerant vessel 140 and the vacuum vessel 150 from contacting each other. May be arranged.

  In this example, the refrigerant tank 140 and the vacuum tank 150 are joined to the inner pipe 213i and the outer pipe 213o of the refrigerant pipe 213 by welding, respectively. Similarly to the refrigerant pipe 213, the branch refrigerant pipe 145 is a vacuum heat insulating pipe having a double pipe structure.

  In addition, in this example, an electric field shield 160 is attached to the lead-out conductor 110 on the room temperature side at a position on the opposite side of the electric field shield ring 125 of the soot tube 120 with the connecting portion 130 interposed therebetween. The electric field shield 160 is a cylindrical body made of a metal such as stainless steel, aluminum, or an alloy thereof, and has a through hole through which the lead conductor 110 is inserted. As shown in FIG. 161 and a cylindrical leg portion 162 extending from the head portion 161 to the connection portion 130 side. The through holes (the inner peripheral surface of the head 161 and the inner peripheral surface of the leg 162) are formed by one straight tube 163. The inside of the electric field shield 160 is a cavity and is filled with air.

  The electric field shield 160 has a head 161 joined to a base 165 fixed to the outer periphery of the lead conductor 110, a refrigerant tank 140 joined to the tip of the leg 162, and a vacuum tank 150 joined to the bottom of the head 161. As a result, the lead conductor 160 is attached so as to cover the outer periphery. The lead conductor 110 and the straight pipe 163 are not in close contact with each other, and the space between the lead conductor 110 and the straight pipe 163 communicates with the space filled with the refrigerant in the refrigerant tank 140. That is, the straight pipe 163 functions as an extension of the refrigerant tank 140, and the refrigerant tank 140 is formed to extend from the connection part 130 to the lead conductor 110 side.

  Further, a bellows is provided on a part of the leg portion 162 (here, the outer peripheral surface of the leg portion 162), so that heat expansion and contraction can be absorbed. Further, by providing the bellows, it is possible to increase the heat transfer distance and to easily suppress heat penetration.

  In the extended portion of the refrigerant tank 140, the distance between the outer peripheral surface of the lead conductor 110 and the inner peripheral surface of the extended portion (straight tube 163) is set to 0.1 mm or more and 2.5 mm or less. In addition, the inside of the refrigerant tank 140 is divided into a liquid refrigerant and a gas refrigerant, and an area of the gas refrigerant is secured in the extended portion of the refrigerant tank 140. Thereby, in the extended portion of the refrigerant tank 140, a temperature gradient from the cryogenic temperature side to the normal temperature side can be provided. For example, the seal member 166 for sealing the contact surface between the lead conductor 110 and the base 165 is excessive. Therefore, it is possible to prevent the seal member 166 from being deteriorated. In addition, by setting the interval to be 0.1 mm or more and 2.5 mm or less, the area of the gas refrigerant is secured without being pressurized by the pressurizer, and the pressure of the gas refrigerant and the pressure of the liquid refrigerant are balanced, The liquid level of the liquid refrigerant at is easily stabilized.

  Further, the vacuum chamber 150 is formed to extend so as to cover the outer periphery of the leg portion 162 of the electric field shield 160.

  Next, in this room temperature insulation type superconducting cable terminal structure 100, as shown in FIG. It is pulled out in a direction different from the direction. The drawn refrigerant is sent from the branch refrigerant pipe 145 to the cooling system 400 provided outside via the fluid pipes 310 and 320. Here, in the case of a room temperature insulation type superconducting cable, the refrigerant pipe 213 is at a high potential because the electric insulation layer 215 is not provided on the outer periphery of the superconducting conductor layer 212 which is a high voltage portion. Therefore, the fluid pipe 310 connected to the branch refrigerant pipe 145 and indirectly connected to the refrigerant pipe 213 is also at a high potential. On the other hand, since an external device such as the cooling system 400 is usually provided in the grounding portion (low voltage portion), the fluid piping 320 connected to the cooling system 400 has a low potential. Therefore, when the high-potential fluid pipe 310 and the low-potential fluid pipe 320 are directly connected, the cooling system 400 may fail due to a potential difference. Therefore, a fluid pipe connection structure 300 for connecting the fluid pipe 310 and the fluid pipe 320 in an electrically insulated state is provided. The connection structure 300 includes an insulating joint (not shown) and connects the fluid pipe 310 and the fluid pipe 320 via the insulating joint.

(Embodiment 2)
In the first embodiment described above, an example of a terminal structure in the case where a line is constructed using a single room-temperature insulated superconducting cable has been described. In the second embodiment, an example of a terminal structure in the case of constructing a line using two room-temperature insulated superconducting cables will be described with reference to FIG. Here, the description will focus on differences from the terminal structure according to Embodiment 1 described with reference to FIGS.

  The two superconducting cables 201 and 202 shown in FIG. 4 have the same configuration as the superconducting cable 200 described in the first embodiment. Both superconducting cables 201 and 202 are laid in parallel, and as shown in FIG. 4, terminal structures 101 and 102 similar to the terminal structure 100 described in the first embodiment are provided at the terminals on the same end side of both superconducting cables 201 and 202, respectively. It has been. The lead conductors 110 in the terminal structures 101 and 102 are electrically connected by the connection conductor 170. That is, both the superconducting cables 201 and 202 are connected in parallel to each other, and the direction of the current flowing through the conductor portion 210 (superconducting conductor layer 212) is the same. In this example, a current flows from the other end side of both the superconducting cables 201 and 202 toward one end side (in FIG. 4, from the superconducting cable 200 side to the lead conductor 110 side), and the lead conductor 175 electrically connected to the connecting conductor 170. As a result, current is taken out from each lead conductor 110 in a lump and is sent to the normal electric power equipment. The connection conductor 170 and the extraction conductor 175 are each formed by a braided wire of a normal conductor. In this way, by constructing a line using a plurality of superconducting cables and sharing the current with the plurality of superconducting cables, it is possible to reduce the current capacity per one line and downsize each superconducting cable. is there.

  Further, in the terminal structures 101 and 102 provided at the terminals on the same one end side (current extraction side) of both the superconducting cables 201 and 202 shown in FIG. 4, the refrigerant conduction ports 141 in the respective terminal structures 101 and 102 are connected to each other via the branched refrigerant pipe 145. It is connected. That is, the refrigerant can flow between the refrigerant tank 140 in one terminal structure 101 and the refrigerant tank 140 in the other terminal structure 102 via the branched refrigerant pipe 145. In this example, the refrigerant flowing in the refrigerant pipe 213 in one superconducting cable 201 flows in the same direction as the current direction, and the refrigerant flowing in the refrigerant pipe 213 in the other superconducting cable 202 via the branch refrigerant pipe 145 Flows in the opposite direction. Thus, the refrigerant flowing through the refrigerant pipe 213 of one superconducting cable 201 is configured to return through the refrigerant pipe 213 of the other superconducting cable 202.

  Furthermore, the same terminal structure is also provided at the same other end side (current supply side, not shown) of both superconducting cables 201 and 202, and the branch refrigerant pipe is connected from the refrigerant conduction port in the other terminal structure. The refrigerant drawn through the refrigerant is supplied from the refrigerant conduction port in one terminal structure through the branch refrigerant pipe and circulates. Here, a cooling system (not shown) is installed on the current supply side, and the refrigerant returned through the refrigerant pipe 213 of the other superconducting cable 202 is once sent to the cooling system and cooled by the cooling system. Then, the refrigerant is supplied to the refrigerant pipe 213 of one superconducting cable 201 and circulates.

  The above-described embodiments can be appropriately changed without departing from the gist of the present invention, and the scope of the present invention is not limited to the above-described configuration.

  The terminal structure of the room temperature insulation type superconducting cable of the present invention can be suitably used for a line using the room temperature insulation type superconducting cable. For example, since the terminal equipment such as a soot pipe used in the existing power cable terminal structure can be used as it is, the laying cost of the superconducting cable can be reduced.

100,101,102 Room-temperature insulated superconducting cable terminal structure
110 Lead conductor
120 steel pipe
121 Bottom plate 122 Support insulator 125 Electric field shield ring
130 connections
140 Refrigerant tank 141 Refrigerant conduction port 145 Branch refrigerant piping
150 Vacuum chamber 151 Vacuum port
160 Electric field shield
161 Head 162 Leg 163 Straight tube (through hole)
165 Base 166 Seal member
170 Connection conductor 175 Lead conductor
200,201,202 Room temperature insulated superconducting cable
210 Conductor 211 Former 212 Superconducting conductor layer
213 Refrigerant piping (vacuum insulation pipe) 213i Inner pipe 213o Outer pipe
214 Refrigerant 215 Electrical insulation layer
300 Fluid piping connection structure
310,320 Fluid piping
400 cooling system

Claims (5)

Room temperature insulation type comprising: a conductor part having a superconducting conductor layer; a refrigerant pipe that houses the conductor part and through which a refrigerant that cools the superconducting conductor layer flows; and an electric insulating layer formed on an outer periphery of the refrigerant pipe. A terminal structure for connecting the terminal of the superconducting cable and the lead conductor drawn to the room temperature side,
Covering the outer periphery of the terminal of the superconducting cable, and a soot tube arranged in a state where the conductor part at the tip of the terminal is exposed to the outside,
A connection part for electrically connecting the conductor part exposed to the outside from the pipe and the lead conductor;
A refrigerant tank that is joined to the refrigerant pipe so as to cover the outer periphery of the connection part, and stores the connection part;
A vacuum chamber covering the outer periphery of the refrigerant tank,
A terminal structure of a room temperature insulation type superconducting cable provided on a side surface of the vacuum chamber with a vacuum suction port that communicates with the vacuum chamber and evacuates the vacuum chamber . Room temperature insulation type comprising: a conductor part having a superconducting conductor layer; a refrigerant pipe that houses the conductor part and through which a refrigerant that cools the superconducting conductor layer flows; and an electric insulating layer formed on an outer periphery of the refrigerant pipe. A terminal structure for connecting the terminal of the superconducting cable and the lead conductor drawn to the room temperature side,
Two superconducting cables are laid, and the terminal structure is provided at each end of the same one end of both superconducting cables,
Each said terminal structure is
Covering the outer periphery of the terminal of the superconducting cable, and a soot tube arranged in a state where the conductor part at the tip of the terminal is exposed to the outside,
A connection part for electrically connecting the conductor part exposed to the outside from the pipe and the lead conductor;
A refrigerant tank that is joined to the refrigerant pipe so as to cover the outer periphery of the connection part, and stores the connection part ,
A branch refrigerant pipe that communicates with the side of the refrigerant tank in each of the terminal structures provided at the terminals on the same one end side of both superconducting cables and branches in a direction different from the drawing direction of the drawing conductor. A refrigerant conduction port joined to the
The terminal structure of a room temperature insulated superconducting cable in which the refrigerant conduction ports in each of the terminal structures are connected via the branch refrigerant pipe . Room temperature insulation type comprising: a conductor part having a superconducting conductor layer; a refrigerant pipe that houses the conductor part and through which a refrigerant that cools the superconducting conductor layer flows; and an electric insulating layer formed on an outer periphery of the refrigerant pipe. A terminal structure for connecting the terminal of the superconducting cable and the lead conductor drawn to the room temperature side,
Two superconducting cables are laid, and the terminal structure is provided at each end of the same one end of both superconducting cables,
Each said terminal structure is
Covering the outer periphery of the terminal of the superconducting cable, and a soot tube arranged in a state where the conductor part at the tip of the terminal is exposed to the outside,
A connection part for electrically connecting the conductor part exposed to the outside from the pipe and the lead conductor;
A refrigerant tank that is joined to the refrigerant pipe so as to cover the outer periphery of the connection part, and stores the connection part;
A vacuum tank covering the outer periphery of the refrigerant tank;
A vacuum suction port for communicating with the inside of the vacuum chamber on the side surface of the vacuum chamber and evacuating the inside of the vacuum chamber,
A branch refrigerant pipe that communicates with the side of the refrigerant tank in each of the terminal structures provided at the terminals on the same one end side of both superconducting cables and branches in a direction different from the drawing direction of the drawing conductor. A refrigerant conduction port joined to the
The terminal structure of a room temperature insulated superconducting cable in which the refrigerant conduction ports in each of the terminal structures are connected via the branch refrigerant pipe . A side surface of the refrigerant tank, communicates with the refrigerant tank, cold insulation according to 請 Motomeko 1 Ru including a refrigerant conducting port to be joined to the branch refrigerant pipe branched in a direction different from the pull-out direction of the lead conductor Type superconducting cable terminal structure. The refrigerant tank is formed to extend to the lead conductor side from the connection portion,
Terminal structure of cold insulated superconducting cable according to any one of the lead conductors and spacing 請 Motomeko 1 Ru der than 2.5mm or less 0.1mm of the refrigerant tank 4.

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