JP6444229B2 - Cryogenic cable termination connection - Google Patents

Description

  The present invention relates to a terminal connection part of a cryogenic cable such as a superconducting cable.

  Conventionally, a superconducting cable using a superconducting wire that becomes a superconducting state at an extremely low temperature as a conductor is known. The superconducting cable is expected as a power cable capable of transmitting a large current with a low loss, and is being developed for practical use.

  The superconducting cable has a structure in which a single-core or multiple-core cable core is accommodated in a heat insulating tube. The cable core includes, for example, a former, a superconducting conductor layer, an electrical insulating layer, a superconducting shield layer, a normal conducting shield layer, and a protective layer in order from the center. The heat insulation pipe includes an inner pipe (hereinafter referred to as “heat insulation inner pipe”) that accommodates the cable core and is filled with a refrigerant (for example, liquid nitrogen), and an outer pipe that covers the outer periphery of the heat insulation inner pipe (hereinafter referred to as “heat insulation outer pipe”). "). Between the heat insulating inner tube and the heat insulating outer tube, a vacuum state is set for heat insulation.

  In the terminal connection part of the superconducting cable, the terminal part of the superconducting cable is accommodated in a low temperature container that is a low temperature part, and the former of the superconducting cable and the superconducting conductor layer are connected to the actual system that becomes the room temperature part through the conductor lead-out part . In addition, the superconducting shield layer and the normal conducting shield layer of the superconducting cable are grounded via the shield energization part. The cryogenic container has a double structure composed of a refrigerant tank that accommodates the terminal portion of the superconducting cable and is filled with a refrigerant such as liquid nitrogen during operation, and a vacuum tank that accommodates the refrigerant tank and is in a vacuum state during operation.

  By the way, in the termination | terminus connection part of a superconducting cable, it is known that a superconducting cable and a refrigerant tank will heat-shrink at the time of cooling. Therefore, in the conventional terminal connection part, means for absorbing thermal contraction during cooling (hereinafter referred to as “shrinkage absorbing part”) is taken (for example, Patent Document 1). Patent Document 1 discloses that a conductor lead portion and a terminal portion of a superconducting cable are connected by a flexible flexible conductor such as a braided wire.

  Also, the terminal portion of the superconducting cable has a configuration in which a straight normal conducting conductor is attached to the tip of the superconducting cable, the normal conducting conductor is fixed to the energizing terminal, and the flexible conductor is connected to the energizing terminal. It has become. Although there is no specific description, it is considered that a superconducting cable former and a superconducting conductor layer are connected to the normal conducting conductor.

JP 2005-12911 A

  Although the terminal connection part described in Patent Document 1 can absorb the heat shrinkage of the superconducting cable during cooling, the conductor lead-out part and the terminal part of the superconducting cable are connected by a flexible conductor, so that the apparatus becomes large. In addition, during cooling, the former of the superconducting cable and the superconducting conductor layer also shrink, but if they are connected to one normal conducting conductor, the connection portion is damaged due to the difference in the amount of thermal shrinkage between them, and the electrical There is a risk that the characteristics (energization characteristics) may be impaired.

  It is an object of the present invention to provide a highly reliable cryogenic cable terminal connection that can absorb the difference in thermal shrinkage between the former and the superconducting conductor layer during cooling and can ensure good electrical characteristics.

The terminal connection part of the cryogenic cable according to the present invention includes at least a former and a terminal part of the cryogenic cable having a superconducting conductor layer,
A conductor connecting portion electrically connected to the former and the superconducting conductor layer;
A conductor lead portion that is electrically connected to the conductor connection portion and draws out the current flowing in the former and / or the superconducting conductor layer to the outside;
Containing a terminal portion of the cryogenic cable, and a refrigerant tank into which a refrigerant is introduced during operation,
The conductor connecting portion includes a first conductor connecting terminal connected to the conductor leading portion, a second conductor connecting terminal connected to the former, and a third conductor connecting terminal connected to the superconducting conductor layer. And having
Each of the second conductor connection terminal and the third conductor connection terminal is electrically connected to the first conductor connection terminal via a spring-like contact, and in the first conductor connection terminal. In the above, it is possible to move in the length direction of the cryogenic cable.

  According to the present invention, each of the second conductor connection terminal and the third conductor connection terminal is electrically connected to the first conductor contact via the spring-like contact, thereby allowing the former at the time of cooling. And the difference in heat shrinkage between the superconducting conductor layers is absorbed, and good electrical characteristics can be ensured. Therefore, a highly reliable terminal connection portion of the cryogenic cable is realized.

It is a figure which shows the termination | terminus connection part which concerns on one embodiment of this invention. It is an enlarged view which shows the connection structure of a conductor extraction part and the terminal part of a cryogenic cable.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing a termination connection unit 1 according to an embodiment of the present invention. For convenience of explanation, the side on which the cryogenic cable 10 is introduced will be described as the rear end side (right side in FIG. 1), and the opposite side will be described as the front end side (left side in FIG. 1).

  As shown in FIG. 1, the terminal connection portion 1 includes a terminal portion of the cryogenic cable 10, a cryogenic container 20, a conductor extraction portion 30, a shield energization portion 40, a soot tube 50, and the like. The terminal portion of the cryogenic cable 10 is accommodated in a predetermined state in the cryogenic container 20 (specifically, the refrigerant tank 21), and the conductor current of the cryogenic cable 10 is transferred to the actual system side such as a power device via the conductor lead-out portion 30. Pulled out. In addition, the shield layer of the cryogenic cable 10 is grounded via the shield energization unit 40.

  The cryogenic cable 10 is a single-core superconducting cable in which a single cable core 11 is accommodated in a heat insulating tube 12. Note that the cryogenic cable 10 may be a three-core three-phase superconducting cable accommodated in the heat insulating tube 12 in a state where three cable cores 11 are twisted together.

  The cable core 11 includes, for example, a former 111, a superconducting conductor layer 112, an electrical insulating layer 113, a superconducting shield layer 114, a normal conducting shield layer 115, a protective layer 116, and the like in order from the center.

  The former 111 has a configuration in which normal conductive wires such as copper wires are twisted together, for example, and an accident current flowing in the superconducting conductor layer 112 is shunted at the time of a short circuit accident. The superconducting conductor layer 112 is formed by spirally winding a plurality of superconducting wires on the former 111, and a transmission current flows during steady operation. An electrically insulating layer 113 is provided on the superconducting conductor layer 112. Superconducting shield layer 114 is formed by spirally winding a plurality of superconducting wires on electrical insulating layer 113, and current flows in reverse phase by electromagnetic induction during steady operation. The normal conducting shield layer 115 is formed by winding a normal conducting wire such as a copper wire on the superconducting shield layer 114, and an accident current flowing in the superconducting shield layer 114 is shunted in the event of a short circuit accident. Superconducting conductor layer 112 and superconducting shield layer 114 may have a laminated structure.

  In the terminal portion of the cryogenic cable 10, the cable core 11 is stepped and the layers are exposed in order from the tip side. A conductor connecting portion 13 that is electrically connected to the former 111 and the superconducting conductor layer 112 is disposed on the outer periphery of the superconducting conductor layer 112. A superconducting shield layer 114 and a shield connection portion 14 that is electrically connected to the normal conducting shield layer 115 are disposed on the outer periphery of the normal conducting shield layer 115. An electric field relaxation layer 15 such as a stress cone is disposed on the outer periphery of the electrical insulating layer 113 located between the conductor connection portion 13 and the shield connection portion 14. A connection structure between the former 111 and the superconducting conductor layer 112 and the conductor connecting portion 13 will be described later.

  The heat insulating tube 12 has a double tube structure including an inner heat insulating inner tube 121 and an outer heat insulating outer tube 122. The heat insulating inner pipe 121 accommodates the cable core 11 and is filled with a refrigerant (for example, liquid nitrogen) during operation. Thereby, the superconducting conductor layer 112 is maintained in a superconducting state. A space between the heat insulating inner pipe 121 and the heat insulating outer pipe 122 is kept in a vacuum state during operation for heat insulation.

The cryogenic container 20 has a double structure including an inner refrigerant tank 21 and an outer vacuum tank 22.
The refrigerant tank 21 has a hollow cylindrical shape, for example, and accommodates the terminal portion of the cryogenic cable 10. The refrigerant tank 21 has a conductor outlet 21 </ b> A for introducing the conductor extraction portion 30 and a shield outlet 21 </ b> B for introducing the shield energization portion 40. The refrigerant tank 21 may be placed on a gantry (not shown) disposed in the vacuum tank 22, for example.

  The end of the cryogenic cable 10 is introduced into the refrigerant tank 21 from the rear end side. The heat insulation inner pipe 121 of the cryogenic cable 10 is connected to the rear end portion 212 of the refrigerant tank 21. The refrigerant is circulated and supplied to the refrigerant tank 21 by a refrigerant circulation device (not shown) during operation. The inside of the heat insulating inner pipe 121 communicating with the refrigerant tank 21 is also filled with the refrigerant.

  An insulating spacer 62 is disposed at the conductor outlet 21 </ b> A of the refrigerant tank 21 in close contact with the conductor drawing portion 30 and the outer surface of the refrigerant tank 21. The insulating spacer 62 is made of, for example, epoxy resin or fiber reinforced plastics (FRP). A lid 63 is disposed at the shield outlet 21 </ b> B of the refrigerant tank 21 in close contact with the outer surface of the refrigerant tank 21. The refrigerant tank 21 and the vacuum tank 22 are partitioned by the insulating spacer 62, the lid 63, and the tip 211 of the refrigerant tank 21, and the refrigerant tank 21 is hermetically and water-tightly sealed.

  The vacuum chamber 22 has, for example, a hollow cylindrical shape, and includes a vacuum chamber main body portion 22A that houses the refrigerant tank 21, a first cylindrical portion 22B that hangs upward from the vacuum tank main body portion 22A, and a first The second cylindrical portion 22C is provided so as to be spaced upward from the vacuum chamber main body portion 22A and spaced apart from the cylindrical portion 22B. In general, the first cylindrical portion 22B and the second cylindrical portion 22C are called temperature gradient portions.

  In the vacuum chamber 22, the conductor outlet 21A is positioned below the first cylindrical portion 22B, and the shield outlet 21B is positioned below the second cylindrical portion 22C. The refrigerant tank 21 is arranged. A heat insulating outer tube 122 of the cryogenic cable 10 is connected to the rear end portion 222 of the vacuum chamber 22. The tip 221 of the vacuum chamber 22 is hermetically sealed.

  The conductor lead-out portion 30 is disposed on the first tubular portion 22B, and the soot tube 50 is disposed on the upper portion of the first tubular portion 22B. The second tubular portion 22C is provided with the measurement pipe 61 and the shield energizing portion 40. The measurement pipe 61 is a corrugated pipe for introducing a sensor 65 of various instruments (for example, a liquid level gauge, a thermometer, a pressure gauge, etc.) into the refrigerant tank 21. One end of the measurement pipe 61 passes through the upper surface of the second cylindrical portion 22 </ b> C of the vacuum chamber 22 in an airtight manner and is drawn to the outside, and the other end penetrates the lid 63 in an airtight manner and extends to the refrigerant bath 21. The measuring unit 64 as ancillary equipment including various instruments is disposed in the vicinity of the measurement pipe 61.

  Since the conductor outlet 21A and the shield outlet 21B of the refrigerant tank 21 are accommodated in the vacuum tank body 22A of the vacuum tank 22, the conductor extraction part 30, the shield energization part 40, and the measurement pipe 61 serving as a heat transfer path are The vacuum chamber body 22A is introduced into the interior. Thereby, since it becomes easy to ensure the heat transfer path length for reducing heat penetration, the length of the first cylindrical portion 22B and the second cylindrical portion 22C can be minimized, and the end connection The part 1 can be downsized.

  The vacuum chamber 22 is evacuated by a vacuum pump (not shown) during operation and kept in a vacuum state. The space between the heat insulating inner tube 121 and the heat insulating outer tube 122 communicating with the vacuum chamber 22 and the inside of the soot tube 50 are also maintained in a vacuum state.

  The conductor lead-out part 30 is a conductor for drawing a current from the cryogenic cable 10 to the actual system. The conductor lead-out part 30 has a conductor lead-out bar made of, for example, a copper bar. In addition, the structure of the conductor extraction part 30 is not limited to this, A well-known structure is applicable. One end of the conductor lead-out part 30 (conductor lead-out bar) is hermetically penetrated through the soot tube 50 and drawn to the outside, and the other end is connected to the conductor connection part 13. The conductor lead portion 30 is electrically connected to the former 111 and the superconducting conductor layer 112 of the cryogenic cable 10 via the conductor connecting portion 13.

  The shield energization unit 40 is a conductor for grounding the superconducting shield layer 114 and the normal conducting shield layer 115 of the cryogenic cable 10. The shield energization unit 40 includes a shield lead bar made of, for example, a copper bar. In addition, the structure of the shield energization part 40 is not limited to this, A well-known structure is applicable. One end of the shield energization part 40 (shield lead bar) is hermetically penetrated through the second cylindrical part 22C of the vacuum chamber 22 and drawn to the outside, and the other end is connected to the shield connection part 14. The shield energization unit 40 is electrically connected to the superconducting shield layer 114 and the normal conducting shield layer 115 of the cryogenic cable 10 via the shield connection unit 14.

The soot tube 50 has a polymer sleeve 51 and a shielding fitting 52.
The polymer sleeve 51 includes an insulating cylinder 51a and a polymer cover 51b. The insulating cylinder 51a is made of FRP (fiber reinforced plastic) having high mechanical strength. The polymer covering 51b is made of a material having excellent electrical insulation performance, for example, a polymer material such as silicone polymer (silicone rubber). The polymer cover 51b is provided on the outer periphery of the insulating cylinder 51a, and a plurality of umbrella-shaped ridges are formed on the outer peripheral surface of the polymer cover 51b so as to be separated in the longitudinal direction. The inside of the polymer sleeve 51 (inside the insulating cylinder 51a) is hollow.

  The shielding metal fitting 52 has a cylindrical portion 52a embedded concentrically with the polymer sleeve 51, and a flange portion 52b extending radially outward from the lower end of the cylindrical portion 52a. The cylindrical portion 52a has an electric field relaxation function, and relaxes the electric field of the soot tube 50.

  By placing the soot tube 50 on the upper part of the first cylindrical portion 22B of the vacuum chamber 22 and connecting the flange portion 52b of the shielding metal fitting 52 with a connecting member (not shown) such as a bolt, the soot tube 50 is in the vacuum chamber 22. To be airtightly fixed. The inside of the soot tube 50 communicates with the first cylindrical portion 22B and is in a vacuum state during operation. Thereby, since a vacuum heat insulation part can be ensured largely, the heat penetration | invasion from the outside through the conductor extraction | drawer part 30 can be reduced.

  FIG. 2 is an enlarged view showing a connection structure between the conductor lead-out portion 30 and the terminal portion of the cryogenic cable 10. In FIG. 2, the upper half of the second conductor connection terminal 132 and the third conductor connection terminal 133 is shown in cross section.

  As shown in FIG. 2, in the present embodiment, the conductor connecting portion 13 includes a first conductor connecting terminal 131 connected to the conductor lead-out portion 30 and a second conductor connecting terminal 132 connected to the former 111. And a third conductor connection terminal 133 connected to the superconducting conductor layer 112.

  The first conductor connection terminal 131 has a head portion 131a and a body portion 131b. The head portion 131 a has an attachment hole 131 c for attaching the conductor lead-out portion 30 from a direction perpendicular to the extending direction of the cryogenic cable 10. The leading end of the conductor lead-out portion 30 is inserted into the mounting hole 131c and is electrically connected. The trunk portion 131b has a cylindrical shape, extends in the longitudinal direction of the cryogenic cable 10, and is electrically connected to the head portion 131a. Here, the trunk portion 131 b is connected to the head portion 131 a and extends perpendicular to the direction in which the conductor leading portion 30 is pulled out.

  The end portion of the cryogenic cable 10 to which the second conductor connection terminal 132 and the third conductor connection terminal 133 are attached is inserted into the trunk portion 131b. The rear end portion of the trunk portion 131b extends to the electrical insulating layer 113. The length of the body portion 131b is set such that the superconducting conductor layer 112 is not exposed even when the cryogenic cable 10 contracts during cooling.

  The second conductor connection terminal 132 has a two-stage cylindrical shape including a former conducting portion 132a and a former attaching portion 132b having a smaller diameter than the former conducting portion 132a. The inner diameter of the insertion hole 132 d of the second conductor connection terminal 132 is substantially the same as the outer diameter of the former 111. The outer diameter of the former conducting portion 132a is substantially the same as the inner diameter of the trunk portion 131b of the first conductor connection terminal 131.

  The former conducting portion 132a has an annular groove 132c on the outer peripheral surface. The former spring contactor 134 is disposed in the annular groove 132c. Here, a multi-contact is applied as the former spring-like contactor 134. As the former spring-like contactor 134, a coil spring type contactor such as a valve seal may be applied instead of the multi-contact. The former 111 is inserted into the insertion hole 132 d of the second conductor connection terminal 132 and the former attachment portion 132 b is compressed, whereby the second conductor connection terminal 132 is connected to the former 111.

  The second conductor connection terminal 132 is electrically connected to the first conductor connection terminal 131 through the former spring-like contactor 134. Since the second conductor connection terminal 132 is not fixed to the first conductor connection portion 131, when the former 111 contracts during cooling, the former 111 moves along with the former 111 and moves to the rear end side. .

  The third conductor connection terminal 133 has a two-stage circular shape including a superconducting conduction portion 133a and a superconducting attachment portion 133b having a smaller diameter than the superconducting conduction portion 133a. The inner diameter of the insertion hole 133d of the third conductor connection terminal 133 is larger than the outer diameter of the former 111, and the insertion hole 133d penetrates in the longitudinal direction. The outer diameter of the superconducting conduction portion 133a is substantially the same as the inner diameter of the body 131b of the first conductor connection terminal 131.

  Superconducting conductive portion 133a has an annular groove 133c on the outer peripheral surface. A superconducting spring-like contact 135 is disposed in the annular groove 133c. Here, a multi-contact is applied as the superconducting spring-like contactor 135. As the superconducting spring-like contact 135, a coil spring type contact such as a valve seal may be applied instead of the multi-contact.

  Superconducting mounting portion 133b has a tapered shape that decreases in diameter toward the rear end side. When the former 111 is inserted into the insertion hole 133 d of the third conductor connection terminal 133, the rear end portion of the superconducting attachment portion 133 b pushes the superconducting conductor layer 112 outward in the radial direction so that the former 111 and the superconducting conductor layer 112 Installed between. The third conductor connection terminal 133 is connected to the superconducting conductor layer 112 by soldering the superconducting conductor layer 112 to the outer peripheral surface of the superconducting attachment portion 133b.

  The insertion hole 133d of the third conductor connection terminal 133 penetrates in the longitudinal direction, and the tip of the former 111 inserted into the insertion hole 133d is inserted into the insertion hole 132d of the second conductor connection terminal 132, and the above-mentioned As described above, the second conductor connection terminal 132 is compression-connected to the former 111.

  The third conductor connection terminal 133 is electrically connected to the first conductor connection terminal 131 via the superconducting spring-like contact 135. Since the third conductor connection terminal 133 is not fixed to the first conductor connection portion 131 and the former 111, when the superconducting conductor layer 112 contracts during cooling, the third conductor connecting terminal 133 follows this and is integrated with the superconducting conductor layer 112. Move to the rear end side.

  The second conductor connection terminal 132 and the third conductor connection terminal 133 are arranged side by side along the longitudinal direction of the cryogenic cable 10. The rear end portion of the second conductor connection terminal 132 and the front end portion of the third conductor connection terminal 133 are separated in consideration of the shrinkage amount during cooling of the former 111 and the superconducting conductor layer 112. Note that the second conductor connecting terminal 132 and the third conductor connecting terminal 133 may partially overlap in the length direction of the cryogenic cable 10 as long as the second conductor connecting terminal 132 and the third conductor connecting terminal 133 can move independently. In this case, it is possible to reduce the size of the terminal connection portion 1 in the length direction.

As described above, the terminal connection portion 1 includes at least the former 111 and the terminal portion of the cryogenic cable 10 having the superconducting conductor layer 112, and the conductor connecting portion 13 electrically connected to the former 111 and the superconducting conductor layer 112. A conductor lead-out portion 30 that is electrically connected to the conductor connection portion 13 and draws out the current flowing through the former 111 and / or the superconducting conductor layer 112 and the terminal portion of the cryogenic cable 10 are accommodated, and a refrigerant is introduced during operation. The refrigerant tank 21 is provided.
The conductor connecting portion 13 includes a first conductor connecting terminal 131 connected to the conductor lead-out portion 30, a second conductor connecting terminal 132 connected to the former 111, and a third conductor connected to the superconducting conductor layer 112. A connection terminal 133. Then, each of the second conductor connection terminal 132 and the third conductor connection terminal 133 is electrically connected to the first conductor connection terminal 131 via the former spring-like contactor 134 and the superconducting spring-like contactor 135. In addition to being connected, the first conductor connection terminal 131 is movable in the longitudinal direction of the cryogenic cable 10.

  According to the termination connection portion 1, the second conductor connection terminal 132 and the third conductor connection terminal 133 are electrically connected to the first conductor contact 131 via the spring-like contacts 134 and 135, respectively. As a result, the difference in thermal shrinkage between the former 111 and the superconducting conductor layer 112 during cooling is absorbed, so that good electrical characteristics can be ensured. Therefore, a highly reliable terminal connection portion of the cryogenic cable is realized.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.

  For example, the configurations of the first conductor connection terminal 131, the second conductor connection terminal 132, and the third conductor connection terminal 133 are not limited to those shown in the embodiment. At the time of cooling, electrical connectivity with the first conductor connection terminal 131 is ensured, and the second conductor connection terminal 132 can move following the contraction of the former 111 to follow the contraction of the superconducting conductor layer 112. The third conductor connection terminal 133 may be moved.

  For example, in the embodiment, the connection of the conductor lead portion 30 to the first conductor connection terminal 131 is described from the direction perpendicular to the extending direction of the cryogenic cable 10. The connection direction is not limited.

Further, for example, the connection structure between the conductor connection portion 13 and the conductor lead-out portion 30 in the embodiment may be applied to the connection structure between the shield connection portion 14 and the shield energization portion 40. That is, the shield connection part 14 includes a first shield connection terminal (not shown) connected to the shield energization part 40 and a second shield connection terminal (not shown) connected to the normal conducting shield layer 115. And a third shield connection terminal (not shown) connected to the superconducting shield layer 114, and each of the second shield connection terminal and the third shield connection terminal is connected via a spring-like contactor It is electrically connected to the first shield connection terminal.
Further, the third conductor connection terminal 133 may be mounted on the superconducting conductor layer 112.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Termination connection part 10 Cryogenic cable 11 Cable core 111 Former 112 Superconducting conductor layer 113 Electrical insulation layer 114 Superconducting shield layer 115 Normal conduction shield layer 116 Protection layer 12 Heat insulation pipe 121 Heat insulation inner pipe 122 Heat insulation outer pipe 13 Conductor connection part 131st 1 conductor connection terminal 132 second conductor connection terminal 133 third conductor connection terminal 134 spring-like contactor for former 135 spring-like contactor for superconductivity 14 shield connection part 15 electric field relaxation layer 20 low temperature vessel 21 refrigerant tank 22 vacuum tank 30 Conductor extraction part 40 Shield energization part 50 Steel pipe

Claims (7)

A terminal portion of a cryogenic cable having at least a former and a superconducting conductor layer;
A conductor connecting portion electrically connected to the former and the superconducting conductor layer;
A conductor lead portion that is electrically connected to the conductor connection portion and draws out the current flowing in the former and / or the superconducting conductor layer to the outside;
Containing a terminal portion of the cryogenic cable, and a refrigerant tank into which a refrigerant is introduced during operation,
The conductor connecting portion includes a first conductor connecting terminal connected to the conductor leading portion, a second conductor connecting terminal connected to the former, and a third conductor connecting terminal connected to the superconducting conductor layer. And having
Each of the second conductor connection terminal and the third conductor connection terminal is electrically connected to the first conductor connection terminal via a spring-like contact, and in the first conductor connection terminal. The terminal connection part of a cryogenic cable characterized by being movable in the length direction of the said cryogenic cable.   The first conductor connection terminal is connected to the head to which the conductor lead portion is connected, and is electrically connected to the head, and extends in the longitudinal direction of the cryogenic cable, and the second conductor connection terminal and The terminal connection part of the cryogenic cable according to claim 1, further comprising a body part into which a terminal part of the cryogenic cable to which the third conductor connection terminal is attached is inserted. The terminal portion of the cryogenic cable has an electrically insulating layer on the superconducting conductor layer,
The terminal connection portion of a cryogenic cable according to claim 2, wherein the trunk portion has a predetermined length that does not expose the superconducting conductor layer during cooling and extends to the electrical insulating layer.   The second conductor connection terminal and the third conductor connection terminal each have an insertion hole into which the former is inserted, and are arranged side by side along the longitudinal direction of the cryogenic cable. Termination connection part of the cryogenic cable as described in any one of claim | item 1 -3. The second conductor connection terminal has a former conduction part in which the spring-like contactor is disposed, and a former attachment part in which the outer diameter is smaller than the former conduction part and the former is inserted.
The terminal connection part of the cryogenic cable according to claim 4, wherein the second conductor connection terminal is connected to the former by compressing the former attachment part. The third conductor connection terminal has a superconducting conduction part in which the spring-like contactor is disposed, and a superconducting attachment part to which the superconducting conductor layer is connected and having an outer diameter smaller than that of the superconducting conduction part,
The former is inserted into the superconducting conduction part and the superconducting attachment part, and the superconducting conductor layer is soldered to the outer peripheral surface of the superconducting attachment part, so that the third conductor connection terminal is connected to the superconducting conductor layer. The termination connection part of the cryogenic cable according to claim 4 or 5, wherein The terminal portion of the cryogenic cable has an electrical insulating layer on the superconducting conductor layer, has a superconducting shield layer on the electrical insulating layer, and further has a normal conducting shield layer on the superconducting shield layer,
A shield connection portion electrically connected to the superconducting shield layer and the normal conducting shield layer;
A shield energization part that is electrically connected to the shield connection part and grounds the superconducting shield layer and the normal conduction shield layer, and
The shield connection portion includes a first shield connection terminal connected to the shield energization portion, a second shield connection terminal connected to the normal conducting shield layer, and a third shield connected to the superconducting shield layer. A shield connection terminal;
Each of the second shield connection terminal and the third shield connection terminal is electrically connected to the first shield connection terminal via a spring-like contact. The termination | terminus connection part of the cryogenic cable as described in any one of.

Images