KR101823814B1 - Joint part for superconducting cable and joint structure for superconducting cable - Google Patents

Abstract

An intermediate connecting member of a superconducting cable for connecting superconducting cables each having a former and a cable core having a superconducting conductor layer formed of superconducting wires on the outer periphery of the former, A superconducting wire for connection which is connected to an end of the superconducting wire forming the superconducting conductor layer and which electrically connects the superconducting conductor layers to each other; And an outer insulating portion provided on the outer side of the wire rod arranging portion and provided with an arrangement hole for arranging the superconducting wire for connection, and an outer insulating portion formed of an insulating resin, wherein the outer insulating portion has an attachment portion Intermediate connecting member of superconducting cable.

Description

TECHNICAL FIELD [0001] The present invention relates to an intermediate connection member of a superconducting cable and an intermediate connection structure of the superconducting cable.

The present invention relates to an intermediate connecting member and an intermediate connecting structure for connecting superconducting cables each having a former and a cable core having a superconducting conductor layer formed of superconducting wires on the outer periphery of the former. Particularly, it is possible to electrically connect the superconducting conductor layers in the respective cable cores of the two superconducting cables connected to each other with low resistance, and to connect the superconducting cable with the intermediate connecting member And an intermediate connection structure of the superconducting cable.

A superconducting cable is expected to be put to practical use as an energy saving technology because it can transmit a large amount of power with a low loss compared to a conventional conducting cable (for example, an OF cable or a CV cable). In recent years, an empirical test for establishing a transmission line by installing a superconducting cable and actually conducting transmission has been underway.

The superconducting cable has a structure in which a cable core having a superconducting conductor layer formed of a superconducting wire on the outer periphery of a former is housed in a heat insulating tube and a coolant such as liquid nitrogen is flowed through the heat insulating tube to cool the superconducting conductor layer And the superconducting state is typical.

When constructing a transmission line by connecting a plurality of superconducting cables together, it is necessary to connect the superconducting cables to each other. Therefore, it is necessary to establish an intermediate connection structure for electrically connecting the superconducting conductor layers exposed from the ends of the cable cores of the two superconducting cables connected to each other. The invention relating to the intermediate connection structure of a superconducting cable is described in, for example, Patent Document 1.

In the connection structure of the superconducting cable disclosed in Patent Document 1, an intermediate connecting member for connecting the superconducting conductors of the cable cores drawn out from the both-superconducting cable is composed of a connecting sleeve ) Is used. The connecting sleeve is a rod-like member made of a normal conductive material such as copper or aluminum, and has connecting portions at both ends to which superconducting conductors are inserted. Then, the superconducting conductors of the cable cores are inserted into the connecting portions of the connecting sleeve, respectively, and the superconducting conductors are connected by compression. Further, a solid insulating member made of an insulating resin such as epoxy resin is disposed on the outer periphery of the connecting sleeve, and a protruding portion is provided on the solid insulating member, and the protruding portion is fixed to the connection box via a metal flange.

[Prior Art Literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-210834

In the conventional intermediate connection structure of a superconducting cable, the superconducting conductor layers are electrically connected to each other via a connection sleeve made of a normal conductive material, and the connection sleeve itself has a higher resistance than the superconducting conductor layer. Therefore, the connection resistance between the superconducting conductor layers is high, and the loss at the connection portion is large.

Therefore, in view of the above circumstances, it is possible to electrically connect the superconducting conductor layers of the cable cores of the two superconducting cables connected to each other with a low resistance, and to fix the connection portions of the two superconducting cables to the connection box An intermediate connecting member of the superconducting cable and an intermediate connection structure of the superconducting cable.

An intermediate connecting member of a superconducting cable according to an aspect of the present invention is an intermediate connecting member of a superconducting cable for connecting superconducting cables having a former and a cable core having a superconducting conductor layer formed on the outer periphery of the former, And a connecting portion connected to ends of the superconducting wire forming the superconducting conductor layer and electrically connecting the superconducting conductor layers to each other, the connecting portion having a fixing portion at both ends for fixing an end portion of the former, A superconducting wire for connection, a wire member disposing portion provided on an outer side of the central portion and provided with disposition holes for disposing the superconducting wire for connection, and an outer insulating portion provided on the outer side of the wire member disposing portion and made of an insulating resin, A middle portion of the superconducting cable having an attachment portion fixed to the intermediate connection box, In a member.

An intermediate connection structure of a superconducting cable according to an aspect of the present invention is an intermediate connection structure of a superconducting cable for connecting superconducting cables having a former and a cable core having a superconducting conductor layer formed on the outer periphery of the former, An intermediate connecting member for connecting the ends of each of the cable cores of the superconducting cable to each other and the formers and the superconducting conductor layers exposed from the ends of the cable cores; Wherein the intermediate connecting member is an intermediate connecting member according to an aspect of the present invention and the intermediate connecting member is fixed to the intermediate connecting box, Structure.

The intermediate connecting member of the superconducting cable and the intermediate connection structure of the superconducting cable can electrically connect the superconducting conductor layers of the cable cores of the two superconducting cables connected to each other with a low resistance, It can be fixed with respect to the connection box.

1 is a schematic perspective view of a cutting model showing an example of a superconducting cable.
2 is a schematic half-section view illustrating an intermediate connecting member of a superconducting cable according to an embodiment.
3 is a schematic cross-sectional view illustrating the intermediate connecting member shown in Fig.
Fig. 4 is an explanatory diagram of a method of forming an arrangement hole in the wire member arrangement portion of the intermediate connecting member shown in Fig. 2;
Fig. 5 is an explanatory diagram of a method of forming an arrangement hole in the outer wire member arrangement portion of the intermediate connecting member shown in Fig. 2;
6 is a schematic view for explaining an intermediate connection structure of the superconducting cable according to the embodiment.

[Description of Embodiments of the Present Invention]

First, an embodiment of the present invention will be described and explained.

The intermediate connecting member of the superconducting cable according to the embodiment of the present invention is characterized in that (1) a superconducting cable connecting a superconducting cable having a former and a cable core having a superconducting conductor layer formed of a superconducting wire on the outer periphery of the former, The connecting member is provided with a fixing portion at both ends for fixing the end portion of the former, a central portion connecting the formers, and a connecting portion connected to an end portion of the superconducting wire forming the superconducting conductor layer, And an outer insulating portion provided on the outer side of the wire rod arranging portion and formed of an insulating resin is provided on the outer side of the wire connecting portion for connecting the superconducting wire for connection And a superconducting cable having an attachment portion fixed to the intermediate connection box in the outer insulation portion A connection member between.

According to the intermediate connecting member of the superconducting cable, since the superconducting conductor layers are electrically connected to each other by the superconducting wire for connection arranged in the arrangement hole of the wire rod arrangement section, the connection resistance between the superconducting conductor layers can be greatly reduced. Therefore, the superconducting conductor layers in the cable cores of the two superconducting cables connected to each other can be electrically connected to each other with a low resistance, so that the loss at the connecting portions can be reduced. Further, the intermediate connecting member can be fixed to the intermediate connection box by the attachment portion provided in the outer insulating portion, and the two-phase superconducting cable (cable core) can be fixed to the intermediate connection box. Therefore, displacement of the superconducting cable (cable core) due to heat shrinkage can be suppressed at the connection portion. In addition, by providing the central portion having the fixing portions at both ends, the formers can be mechanically connected (connected), and the two superconducting cables (cable cores) can be firmly connected. As the insulating resin forming the outer insulating portion, for example, an epoxy resin can be cited.

(2) The cable core further includes an outer superconducting conductor layer formed concentrically with an outer surface of the superconducting conductor layer via an insulating layer, the outer superconducting conductor layer being formed of a superconducting wire, and the end of the superconducting wire forming the outer superconducting conductor layer An outer insulating superconducting wire connected to the outer superconducting conductor layer and electrically connecting the outer superconducting conductor layers to each other; an intermediate insulating portion formed of an insulating resin between the wire rod arranging portion and the outer insulating portion; And an outer wire member disposing portion in which an arrangement hole for disposing the superconducting wire for outer connection is formed.

As the structure of the cable core of the superconducting cable, the outer superconducting conductor layer may be arranged concentrically via the insulating layer on the outer side of the superconducting conductor layer. For example, in the case of DC transmission, in the case of a single-pole (monopole) power transmission system, the outer superconducting conductor layer is used as a conductor through which current flows back, or in the case of a dipole (bipolar transmission) It may be used as a conductor through which a current having a polarity opposite to that of the conductor layer flows. Further, in the AC transmission, the outer superconducting conductor layer may be used as the electromagnetic shielding layer. According to this aspect, since the outer superconducting conductor layers are electrically connected to each other by the outer superconducting wire, the connection resistance between the outer superconducting conductor layers can be greatly reduced, and the outer superconducting conductor layers can be electrically connected to each other with low resistance have. The intermediate insulating portion may be formed of the same insulating resin (for example, epoxy resin) as the outer insulating portion.

(3) The total number of the superconducting wires for connection is preferably larger than the total number of superconducting wires forming the superconducting conductor layer.

In the case of the same superconducting wire, the transmission current is determined by the size of the cross-sectional area of the conductor, that is, the number of superconducting wires. According to this aspect, since the total number of the superconducting wires for connection is larger than the total number of the superconducting wires forming the superconducting conductor layer, the connection resistance between the superconducting conductor layers can be further reduced, have. The total number of the superconducting wires for outer connection may also be larger than the total number of superconducting wires forming the outer superconducting conductor layer.

(4) It is preferable that a plurality of the superconducting wires for connection are arranged in one of the arrangement holes, and these superconducting wires for connection are integrated.

According to this aspect, since the plurality of connecting superconducting wires are integrated, a plurality of connecting superconducting wires can be simultaneously arranged in one placing hole, and the connecting superconducting wires can be easily arranged in the wire rod arranging portion. Likewise, the superconducting wire for outer connection may be arranged in one arrangement hole in a state in which a plurality of superconducting wires are integrated.

(5) The insulating resin forming the outer insulating portion is preferably a fiber-reinforced resin.

As described above, since the intermediate connecting member is provided with the attaching portion on the outer insulating portion and fixed to the intermediate connecting box, the mechanical strength required to withstand the heat shrinkage of the superconducting cable (cable core) is required. According to this aspect, since the outer insulating portion is formed of the fiber reinforced resin (FRP), the mechanical strength of the outer insulating portion can be further increased. The intermediate insulating portion may also be formed of a fiber reinforced resin.

The intermediate connection structure of the superconducting cable according to the embodiment of the present invention is characterized in that (6) a superconducting cable connecting a superconducting cable having a former and a cable core having a superconducting conductor layer formed on the outer periphery of the former, An intermediate connecting member for connecting ends of each of said cable cores of said superconducting cable to be connected to each other and said formers and said superconducting conductor layers exposed from ends of said cable cores, And an intermediate connection box for accommodating the intermediate connection member, wherein the intermediate connection member is an intermediate connection member according to any one of the above-mentioned embodiments (1) to (5) And an intermediate connection structure of the superconducting cable fixed to the intermediate connection box.

According to the intermediate connection structure of the superconducting cable, since the superconducting conductor layers exposed from the ends of the cable cores of the both superconducting cables are electrically connected to each other by the superconducting wire for connection of the intermediate connecting member, Can be greatly reduced. Therefore, the superconducting conductor layers in the cable cores of the two superconducting cables connected to each other can be electrically connected to each other with a low resistance, so that the loss at the connecting portions can be reduced. Further, the formers are mechanically connected (connected) by the center portion of the intermediate connecting member, so that the two superconducting cables (cable cores) can be firmly connected. In addition, since the intermediate connecting member is fixed to the intermediate connection box by the attachment portion provided in the outer insulating portion of the intermediate connection member, and the two superconducting cables (cable cores) are fixed to the intermediate connection box, Displacement of the superconducting cable (cable core) due to shrinkage can be suppressed.

[Detailed Description of Embodiments of the Present Invention]

Specific examples of the embodiments of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings denote the same names. Hereinafter, the superconducting cable used in the transmission line will first be described, and then the intermediate connecting member used in the intermediate connection structure of the superconducting cable will be described.

It is to be understood that the present invention is not limited to these examples, but may be embodied by the appended claims, and is intended to include all modifications within the meaning and scope equivalent to those of the claims.

<Superconducting cable>

An example of a superconducting cable will be described with reference to Fig. Here, a bipolar transmission type DC superconducting cable will be described as an example. The superconducting cable 100 is a single core cable having a cable core 110 and a heat insulating tube 120 for accommodating the cable core 110 and one cable core 110 housed in the heat insulating tube 120.

(Cable core)

The cable core 110 includes a former 111, a superconducting conductor layer 112, an insulating layer 113, an outer superconducting conductor layer 114, an outer insulating layer 115, a ground layer 116, The protective layer 117 is arranged concentrically.

(Former)

The former 111 is made of a metal or an alloy such as copper, aluminum, or stainless steel. As the former 111, for example, a stranded wire in which a plurality of metal wires are twisted together can be used. In this example, the former 111 is formed by twisting a plurality of copper wires together. In the case of a DC superconducting cable, it is not necessary to apply insulating coating such as enamel to a former (copper wire). However, in the case of an AC superconducting cable, from the viewpoint of reducing AC loss, a plurality of metal wires Copper wire) are preferably twisted together to formers. Even in the case of a DC superconducting cable, a copper wire having an insulating coating may be used.

(Superconducting conductor layer)

The superconducting conductor layer 112 is formed by winding a plurality of superconducting wires around the outer periphery of a former 111 in a helical shape and can be formed into a multilayer structure in which superconducting wires are laminated by winding multiple layers of superconducting wires. As the superconducting wire, for example, a superconducting wire such as a sheath wire or an RE123 based thin wire wire can be used for the Bi system. In this example, the superconducting conductor layer 112 has a four-layer structure, and a current of positive polarity (+ polarity) flows through the superconducting conductor layer 112.

(Insulating layer)

The insulating layer 113 is interposed between the superconducting conductor layer 112 and the outer superconducting conductor layer 114 disposed on the outside of the superconducting conductor layer 112 to electrically connect the superconducting conductor layer 112 and the outer superconducting conductor layer 114 Ensure insulation. The insulating layer 113 is formed by winding an insulating paper around the outer periphery of the superconducting conductor layer 112 in a spiral shape. As the insulating paper, for example, a Kraft paper or a semi-synthetic paper called PPLP (registered trademark) (Polypropylene Laminated Paper) can be used.

(Outer superconducting conductor layer)

The outer superconducting conductor layer 114 is formed by spirally winding a plurality of superconducting wires on the outer side of the superconducting conductor layer 112, specifically on the outer periphery of the insulating layer 113. Similarly to the superconducting conductor layer 112, the outer superconducting conductor layer 114 can be formed into a multilayer structure in which the superconducting wires are laminated by winding the superconducting wires in multiple layers. In this example, the outer superconducting conductor layer 114 has a two-layer structure, and a negative (-electrode) current flows through the outer superconducting conductor layer 114.

(Outer insulating layer)

The outer insulating layer 115 is interposed between the outer superconducting conductor layer 114 and the ground layer 116 disposed on the outer superconducting conductor layer 114 to electrically isolate the outer superconducting conductor layer 114 from the ground layer 116 . The outer insulating layer 115 is formed by winding an insulating paper around the outer periphery of the outer superconducting conductor layer 114 in a spiral shape.

(Ground layer)

The ground layer 116 functions as a neutral line and is grounded. The ground layer 116 is formed by winding a ground conductor around the outer insulating layer 115. The ground layer 116 may be formed, for example, by winding a wire or tape made of a normal conductive material such as copper or aluminum in a spiral shape, or by winding a braided wire made of a normal conductive material can do. In this example, the ground layer 116 is formed of copper tape. The ground layer 116 also functions as an electric field shielding layer.

(Protective layer)

The protection layer 117 is disposed on the outermost periphery of the cable core 110 and is provided with a protection layer 117 for protecting the cable core 110 (a member located on the inner side of the protection layer 117 do. The protective layer 117 is formed by winding an insulating paper around the outer periphery of the ground layer 116 in a spiral shape.

(Insulating tube)

The heat insulating tube 120 is a double tube structure having an inner tube 121 and an outer tube 122. The space between the inner tube 121 and the outer tube 122 is vacuumed and a heat insulating material such as super insulation (123) are disposed. In this example, the inner pipe 121 and the outer pipe 122 are corrugated tubes of a stainless steel product, and the outer periphery of the heat insulating pipe 120 (outer pipe 122) 124 are provided.

<Intermediate Connection Member>

An example of the intermediate connecting member for connecting the above-described superconducting cables 100 will be described with reference to Figs. 2 to 6. Fig. 3 is a view of the intermediate connecting member 1 seen from its end face, and although not shown in cross-section, hatching is partially performed for easy viewing of the drawings (FIGS. 4 and 5 are also the same). 6, the intermediate connecting member 1 is made up of the formers 111 exposed from the ends of the cable cores 110 of the two superconducting cables 100 connected to each other, the superconducting conductor layers 112, And connect the outer superconducting conductor layers 114 to each other. As shown in Figs. 2 and 3, the intermediate connecting member 1 includes a central portion 10, a wire rod arrangement portion 20, an intermediate insulation portion 30, an outer wire rod arrangement portion 40, And a superconducting wire member 20s for connection and a superconducting wire member 40s for external connection are disposed in the wire member arrangement unit 20 and the outer wire member arrangement unit 40 respectively.

(center)

The central portion 10 is a rod-shaped member connecting the formers 111 (see Fig. 6), and has a fixing portion 11 for fixing the end portions of the formers 111 at both ends thereof. Since the central portion 10 mechanically connects (connects) the formers 111, it is preferable that the central portions 10 are formed of a metal having high mechanical strength. Examples of the metal forming the central portion 10 include metals and alloys such as copper, aluminum and stainless steel. In the intermediate connecting member 1, the electrical connection between the superconducting conductor layers 112 and the outer superconducting conductor layers 114 is carried out by the superconducting wire member 20s for connection and the superconducting wire member 40s for external connection, (10) is basically not required to have conductivity. Therefore, it is more preferable that the center portion 10 is formed of stainless steel having excellent mechanical strength. In this example, the central portion 10 is made of stainless steel.

The fixing portion 11 is provided with a fitting hole 11o. The center portion 10 and the former 111 are connected to each other by, for example, inserting the end portion of the former 111 into the fitting hole 11o and compressing from the outside. The portion where the fitting hole 11o of the fixing portion 11 is formed has a thick thickness, so that compression bonding is easy.

(Wire rod arrangement section)

The wire rod arranging portion 20 is a cylindrical portion provided on the outer periphery of the central portion 10 and provided with a disposition hole 20h for disposing the superconducting wire for connection 20s. The arrangement hole 20h penetrates from the one end to the other end in the longitudinal direction of the wire rod arranging portion 20. [ A plurality of connecting superconducting wires 20s are disposed in the arrangement hole 20h. The connecting superconducting wire rods 20s are inserted into the arrangement holes 20h of the wire rod arranging portion 20 from one side to the other to electrically connect the superconducting conductor layers 112 to each other (see FIG. 6). The connecting superconducting wire 20s is sufficiently longer than the length of the placing hole 20h and both ends of the connecting superconducting wire 20s protrude from the placing hole 20h. It is preferable that the wire rod arranging portion 20 is formed of a metal having a high thermal conductivity to easily cool the superconducting wire for connection 20s. In this example, the central portion 10 and the wire rod arrangement portion 20 are integrally formed, and the wire rod arrangement portion 20 is formed of stainless steel. The same superconducting wire as the superconducting wire for forming the superconducting conductor layer 112 is used for the connecting superconducting wire 20s and the total number of the superconducting wires for connection 20s forms the superconducting conductor layer 112 The number of superconducting wires is greater than the total number of superconducting wires. That is, the total conductor cross-sectional area of the superconducting wire 20s for connection arranged in the wire rod arranging portion 20 is larger than the conductor cross-sectional area of the superconducting conductor layer 112.

Although the central portion 10 and the wire rod arranging portion 20 are integrally formed in this example, the central portion 10 and the wire rod arranging portion 20 may be separate members. In the case where the central portion 10 and the wire rod arranging portion 20 are separate members, the central portion 10 and the wire rod arranging portion 20 may be joined with an adhesive or mechanically coupled with a screw. Although the wire rod arranging portion 20 can be formed of a metal or alloy such as copper or aluminum, it is preferably formed of stainless steel. A part of the current flowing in the superconducting wire for connection 20s hardly flows into the wire rod arrangement portion 20 by forming the wire rod arrangement portion 20 of stainless steel having a relatively large electrical resistance, And the heat generation of the wire rod arranging portion 20 can be suppressed. Further, a superconducting wire different from the superconducting wire forming the superconducting conductor layer 112 may be used for the superconducting wire member 20s for connection.

A method of forming the arrangement hole 20h of the wire member placement unit 20 will be described. The arrangement hole 20h may be formed by cutting in the longitudinal direction of the wire material arranging portion 20 by using a drill or the like, but it is difficult to form the long through hole by a drill. Thus, in this example, the wire rod arranging portion 20 is manufactured by dividing the wire rod arranging portion 20 into two cylindrical members in the radial direction at the place where the arranging hole 20h is formed, and integrating them into one. More specifically, as shown in Fig. 4, the wire rod arranging portion 20 is divided into an inner cylindrical portion 21 (upper left in Fig. 4) including the central portion 10, an outer diameter of the inner cylindrical portion 21 And the outer cylindrical portion 22 (the right upper side in Fig. 4) having the same inner diameter. An inner cylindrical portion 21 is inserted into the outer cylindrical portion 22 to form the inner cylindrical portion 21 and the inner cylindrical portion 21 is formed in the outer peripheral surface of the inner cylindrical portion 21, And the outer cylindrical portion 22 is welded and integrated at the end portion, thereby manufacturing the wire rod arrangement portion 20 (the lower portion in Fig. 4). Thereby, the wire grooves 21g formed on the outer circumferential surface of the inner cylindrical portion 21 become the arrangement holes 20h, and the wire rod arrangement portions 20 in which the arrangement holes 20h penetrating in the longitudinal direction are formed are obtained . In the wire rod arrangement portion 20, it is not necessary to form the long through-hole by a drill, and accordingly, the placement hole 20h can be precisely formed by simple groove processing. The present invention is not limited to this embodiment. The present invention is not limited to this example, but the present invention is not limited to this example. In this example, the case 21g is formed on the outer circumferential surface of the inner cylindrical portion 21. However, And an inner circumferential surface of the outer cylindrical portion 22 may be provided with an arrangement groove. In the latter case, the inner cylindrical portion 21 and the outer cylindrical portion 22 may be integrated so that the arrangement grooves of the inner cylindrical portion 21 and the outer cylindrical portion 22 overlap with each other in the radial direction.

In this example, three arrangement holes 20h are formed at intervals in the circumferential direction of the wire member arrangement section 20, and a plurality of connection superconducting wire members 20s are arranged in the arrangement holes 20h. Concretely, the superconducting wires 20s for connection are inserted into the respective arrangement holes 20h in the circumferential direction, and are fixed to the ends of the wire rod arranging portion 20 by soldering. For example, when a plurality of connecting superconducting wires 20s are stacked and inserted into the arranging holes 20h, the connecting superconducting wires 20s are integrated with solder, (20s) may be arranged in the circumferential direction of each arrangement hole 20h.

(Intermediate insulation part)

The intermediate insulation portion 30 is a cylindrical member formed on the outer periphery of the wire rod arrangement portion 20 and formed of an insulating resin. The intermediate insulating portion 30 is interposed between the wire rod arranging portion 20 and the outer wire rod arranging portion 40 disposed on the outer side so that the distance between the connecting superconducting wire 20s and the outer connecting superconducting wire 40s Thereby ensuring the electrical insulation. As the insulating resin forming the intermediate insulating portion 30, for example, an epoxy resin or the like may be mentioned, or a fiber reinforced resin (FRP) reinforced with a resin may be used. By forming the intermediate insulating portion 30 with FRP, the mechanical strength of the intermediate insulating portion 30 can be further increased. In this example, the intermediate insulation portion 30 is formed of a molded product of FRP reinforced with epoxy resin by glass fiber.

The intermediate insulation portion 30 is coupled to the outer circumferential surface of the wire rod arrangement portion 20. The wire rod arranging portion 20 and the intermediate insulating portion 30 may be coupled with an adhesive or may be mechanically coupled with a screw so as to more firmly connect the wire rod arranging portion 20 and the intermediate insulating portion 30. [

(Outer wire rod arrangement part)

The outer wire member arranging portion 40 is a cylindrical member provided on the outer periphery of the intermediate insulating portion 30 and having a disposition hole 40h for disposing the superconducting wire 40s for outer connection. The arrangement hole 40h penetrates from one end to the other end in the longitudinal direction of the outer wire member arranging portion 40. [ And a plurality of outer connection superconducting wires 40s are disposed in the arrangement hole 40h. The superconducting wires 40s for external connection are inserted into the arrangement holes 40h of the outer wire rods 40 from one side to the other and electrically connect the outer superconducting conductor layers 114 to each other (see FIG. 6). The outer connection superconducting wire 40s is sufficiently longer than the arrangement hole 40h and both ends of the outer connection superconducting wire 40s protrude from the arrangement hole 40h. It is preferable that the outer wire member 40 is formed of a metal having a high thermal conductivity so as to easily cool the outer connecting superconducting wire 40s. In this example, the outer wire member arrangement portion 40 is formed of stainless steel. The same number of superconducting wires 40s as the superconducting wires for forming the outer superconducting conductor layer 114 are used for the outer connecting superconducting wire 40s and the total number of the superconducting wires 40s for outer connecting is used for the outer superconducting conductor layer 114) of the superconducting wires. That is, the total conductor cross-sectional area of the outer connection superconducting wire 40s disposed in the outer wire member arranging portion 40 is larger than the conductor cross-sectional area of the outer superconducting conductor layer 114.

The outer wire member arrange- ment 40 may be formed of a metal or alloy such as copper or aluminum, but is preferably formed of stainless steel. Since the outer wire member 40 is formed of stainless steel having a relatively large electrical resistance, a part of the current flowing through the outer wire member 40s for superconducting wires 40s is less likely to flow into the outer wire member 40, And the heat generation of the outer-side wire rod arranging portion 40 can be suppressed. As the superconducting wire 40s for external connection, a superconducting wire different from the superconducting wire forming the outer superconducting conductor layer 114 may be used.

Similarly to the wire rod arranging portion 20, the outer wire rod arranging portion 40 is also manufactured by dividing the cylindrical portion into two cylindrical members in the radial direction at the position where the arrangement hole 40h is formed, and integrating these two cylindrical members. Specifically, as shown in Fig. 5, the outer-side wire rod arranging portion 40 is divided into an inner cylindrical portion 41 (upper left in Fig. 5) and an outer cylindrical portion 41 having an inner diameter equal to the outer diameter of the inner cylindrical portion 41 And an arrangement groove 41g is formed on the outer peripheral surface of the inner cylindrical portion 41 from one end in the longitudinal direction to the other end in the longitudinal direction. The inner cylindrical portion 41 is inserted into the outer cylindrical portion 42 and the inner cylindrical portion 41 and the outer cylindrical portion 42 are welded at the ends to integrate the outer cylindrical portion 41, 5). Thereby, the arrangement groove 40g formed on the outer circumferential surface of the inner cylindrical portion 41 becomes the arrangement hole 40h, and the outer-side wire member placement portion 40 in which the arrangement hole 40h penetrating in the longitudinal direction is formed is obtained Loses. In this outer wire material arranging portion 40, it is not necessary to form the long through hole by a drill, and accordingly, the arrangement hole 40h can be precisely formed by simple groove machining.

In this example, six arrangement holes 40h are formed at intervals in the circumferential direction of the outer-side wire arrangement portion 40, and a plurality of outer-connection superconducting wire rods 40s are arranged in the arrangement holes 40h have. Concretely, the superconducting wires 40s for outer connection are inserted into the arrangement holes 40h in the circumferential direction, and then fixed to the ends of the outer wire rod arranging portion 40 by soldering. For example, when a plurality of superconducting wires 40s for external connection are laminated and inserted into the arrangement holes 40h, the laminated superconducting wires 40s for external connection are integrated with solder, The superconducting wires 40s may be arranged in the circumferential direction of the arrangement holes 40h.

The outer wire member 40 is coupled to the outer circumferential surface of the intermediate insulating member 30. [ The intermediate insulating portion 30 and the outer wire member arranging portion 40 may be mechanically coupled with each other by an adhesive so as to join the intermediate insulating portion 30 and the outer wire member arranging portion 40 more firmly.

(Outer insulating portion)

The outer insulation portion 50 is a cylindrical member formed on the outer periphery of the outer wire rod arrangement portion 40 and made of an insulating resin. The outer insulating portion 50 is disposed on the outermost periphery of the intermediate connecting member 1 and has a member (for example, a connecting ground wire 52 (refer to FIG. 2) or the like) located on the outer side thereof and an outer connecting superconducting wire 40s In the present embodiment. As the insulating resin forming the outer insulating portion 50, for example, an epoxy resin or the like may be mentioned, or a fiber reinforced resin (FRP) reinforced with a resin may be used. By forming the outer insulating portion 50 with FRP, the mechanical strength of the outer insulating portion 50 can be further increased. In this example, the outer insulating portion 50 is formed of a molded product of FRP reinforced with epoxy resin by glass fiber.

The outer insulating portion 50 is coupled to the outer circumferential surface of the outer wire member arranging portion 40. The outer wire member 40 and the outer insulating member 50 may be coupled with each other by an adhesive or may be mechanically coupled with the outer wire member 40 to securely connect the outer wire member 40 and the outer insulating member 50.

The outer insulating portion 50 is integrally formed with a flange-shaped attachment portion 51 projecting in the radial direction. The intermediate connection member 1 is fixed to the intermediate connection box 7 by fixing the attachment portion 51 to the support portion 70a (see Fig. 6) of the intermediate connection box 7 with bolts or the like. Specifically, the attachment portion 51 is inserted between the support portion 70a and the presser plate 70b and tightly fastened between the support portion 70a and the presser plate 70b by bolts, so that the intermediate connection member 1 And is fixed to the intermediate connection box 7. The support portion 70a is provided in the intermediate connection box 7 so as to extend vertically from the inner circumferential surface of the intermediate connection box 7, and is formed of, for example, stainless steel. A plurality of support portions 70a are provided on the inner peripheral surface of the intermediate connection box 7 at intervals in the circumferential direction. The press plate 70b is a ring-shaped member which is interposed between the support portion 70a and the attachment portion 51, for example, and is formed of stainless steel. The intermediate connection box 7 is a box that covers the connecting portion of the two superconducting cables 100 including the intermediate connecting member 1 and is fixed to the ground.

A connection ground wire 52 is wound around the outer periphery of the outer insulation portion 50 and the ground layer 116 is electrically connected to the connection ground wire 52 (see FIG. 6). In this example, the connecting ground wire 52 is formed of a braided wire made of a normal conductive material such as copper or aluminum. Both ends of the connecting ground wire 52 are electrically connected to the ground layer 116 of each cable core 110 of the two superconducting cables 100 connected to each other and the connecting ground wire 52 is electrically connected to the ground layer 116 Are electrically connected to each other to form an electric field shielding layer.

Next, an example of an intermediate connection structure for connecting the above-described superconducting cables 100 will be described mainly with reference to Fig. The intermediate connection structure includes the end portions of the cable cores 110 of the two superconducting cables 100 connected to each other, the intermediate connecting member 1 described above, the end portions of the cable cores 110 and the intermediate connecting member 1 And an intermediate connection box (7) for storing the intermediate connection box (7). The intermediate connection structure shown in Fig. 6 is constructed as follows.

The cable core 110 is drawn out from each heat insulating pipe 120 of the two-phase superconducting cable 100 connected to each other. The ends of each of the drawn out cable cores 110 are subjected to edge treatment to peel off the protective layer 117, the outer insulating layer 115 and the insulating layer 113 to form the former 111, the superconducting conductor layer 112 ), The outer superconducting conductor layer 114, and the ground layer 116 are exposed. When the end portion is processed, the ground layer 116 is unwound from the exposed end by unwinding the ground conductor (copper tape) and pulling out the ground conductor in the separated state from the end. Also, the superconducting conductor layer 112 and the outer superconducting conductor layer 114 are also unwound from the exposed ends by unwinding the superconducting wire, and the superconducting wire is pulled out from the end of the superconducting wire in the separated state.

The intermediate connecting member 1 is previously provided at a position where the two superconducting cables 100 are connected. In this example, the intermediate connecting member 1 is previously fixed to the ring-shaped annular portion 73 which is a part of the intermediate connecting box 7, and the intermediate connecting member 1 1) at a predetermined position. A support portion 70a is formed integrally with the ring portion 73 so as to protrude from the inner circumferential surface. The attachment portion 51 provided on the outer side insulation portion 50 of the intermediate connection member 1 is sandwiched between the support portion 70a and the pressure plate 70b and tightly fastened with bolts to the ring portion 73 The intermediate connecting member 1 is fixed.

The ends of the formers 111 exposed from the respective cable cores 110 are inserted into the fitting holes 11o of the central portion 10 of the intermediate connecting member 1 and are compressed from the outside of the fixing portion 11, To formers 111 are connected to each other.

Next, the ends of the superconducting wires forming the superconducting conductor layers 112 exposed from the cable cores 110 and the ends of the superconducting wires 20s disposed in the wire rod arranging portions 20 of the intermediate connecting member 1, And superconducting conductor layers 112 are electrically connected to each other by soldering.

After connecting the superconducting wire forming the superconducting conductor layer 112 and the superconducting wire member 20s for connection, insulating paper is wrapped around the superconducting conductor layer 112 (superconducting wire member) and the superconducting wire member 20s for connection Thereby forming the stiffening insulation portion 61.

An end portion of the superconducting wire forming the outer superconducting conductor layer 114 exposed from each of the cable cores 110 and the end portion of the outer wire rod arrangement portion 40 of the intermediate connecting member 1 after the reinforcing insulating portion 61 is formed, And the outer superconducting conductor layers 114 are electrically connected to each other by soldering the ends of the superconducting wire members 40s. Thereafter, an insulating paper is wound around the exposed outer superconducting conductor layer 114 (superconducting wire) and the outer connecting superconducting wire 40s to form a reinforcing insulating portion 62. [

The end portion of the ground conductor forming the ground layer 116 exposed from each cable core 110 and the end portion of the connecting ground wire 52 provided in the outer insulating portion 50 of the intermediate connecting member 1 And they are electrically connected by solder bonding to form an electric field shielding layer. Thus, the intermediate connection process between the ends of the cable cores 110 and the intermediate connecting member 1 is completed.

Finally, the intermediate connection box 7 is assembled so as to accommodate the ends of the respective cable cores 110 and the intermediate connection member 1. In this example, the intermediate connection box 7 has a cylindrical peripheral wall portion 71 and a pair of end wall portions 72 which close both ends of the peripheral wall portion 71. Each of the end wall portions 72 is provided with an introduction hole through which the ends of the heat insulating tubes 120 of the two superconducting cables 100 are connected and the ends of the cable cores 110 are introduced. The peripheral wall portion 71 is formed by the ring-shaped annular portion 73 described above and a pair of cylindrical half-divided pieces that can be divided in the longitudinal direction. After the completion of the intermediate connecting process, The half halves are moved toward the connection point (intermediate connecting member 1) side of the positive-superconducting cable 100, and the half halves are welded to the ring 73 to be integrated. After the peripheral wall portions 71 are formed by integrating the half halves and the annular portions 73 and then the end wall portions 72 are welded to both end portions of the peripheral wall portions 71, ). As a result, the attachment portion 51 of the intermediate connection member 1 is fixed to the support portion 70a of the intermediate connection box 7 (the ring portion 73), and the intermediate connection member 1 is fixed to the intermediate connection box 1 7). The intermediate connection box 7 is fixed with respect to the ground.

It is possible to effectively reduce the heat penetration by arranging the intermediate connection box 7 as a double structure and arranging a heat insulating material between the layers of the double structure or by vacuum sucking each layer of the double structure to form a vacuum heat insulating layer can do. The peripheral wall portion 71 (including the ring portion 73) and the end wall portion 72 of the intermediate connection box 7 can be formed of, for example, stainless steel. The supporting portion 70a may be integrally formed in the annular portion 73 in the example of the intermediate connection structure described above but may be provided by bonding the supporting portion 70a to the inner peripheral surface of the annular portion 73 by welding or the like.

In the above-described embodiments, the bipolar transmission type DC superconducting cable is taken as an example. However, the present invention is applicable to the DC superconducting cable of the single pole transmission type, and also to the AC superconducting cable. In the above-described embodiment, a single-core cable in which one cable core is housed in a heat insulating pipe has been described as an example. However, the present invention is also applicable to a multi-core cable in which a plurality of cable cores are housed in a heat insulating pipe. Specifically, the present invention is also applicable to a three-core type superconducting cable in which three cable cores are twisted together to be housed in a heat insulating tube in a lump.

(Industrial availability)

The intermediate connection member and the intermediate connection structure of the superconducting cable of the present invention are suitable for the intermediate connection member and the intermediate connection structure for connecting the superconducting cables when constructing the transmission line by connecting the plurality of superconducting cables together Can be used.

1: intermediate connecting member
10: center
11:
11o: Fitting hole
20:
20s: Superconducting wire for connection
20h: Placement hole
21: inner cylinder part
22: outer cylinder part
21g: Batch Home
30: Medium insulation part
40:
40s: superconducting wire for outer connection
40h: Batch hole
41: inner cylinder part
42: outer cylinder part
41g: Batch Home
50 outer insulating portion
51:
52: Ground wire for connection
61, 62: reinforced insulation part
7: Middle connection box
70a:
70b:
71: peripheral wall portion
72: end wall portion
73:
100: Superconducting cable
110: Cable core
111: Former
112: superconducting conductor
113: insulating layer
114: outer superconducting conductor layer
115: outer insulating layer
116: ground layer
117: Protective layer
120 insulation pipe
121: Inner pipe
122: Appearance
123: Insulation:
124:

Claims (6)

An intermediate connecting member of a superconducting cable for connecting superconducting cables each having a former and a cable core having a superconducting conductor layer formed of superconducting wires formed on the outer periphery of the former,
A central portion at both ends of which a fixing portion for fixing an end of the former is fixed,
A connecting superconducting wire connected to an end of the superconducting wire forming the superconducting conductor layer and electrically connecting the superconducting conductor layers to each other,
A wire member disposing portion provided on the outer side of the central portion and provided with disposition holes for disposing the superconducting wire for connection,
An outer insulating portion provided on the outer side of the wire rod arranging portion and formed of an insulating resin,
Respectively,
Wherein the outer insulating portion has an attachment portion fixed to the intermediate connection box,
Wherein a plurality of arrangement holes of the wire rod arranging portions are formed at intervals in the circumferential direction of the wire rod arranging portion
Intermediate connecting member of superconducting cable.
The method according to claim 1,
Wherein the cable core further comprises an outer superconducting conductor layer formed concentrically with an insulating layer outside the superconducting conductor layer and formed of superconducting wires,
An outer connection superconducting wire connected to an end of the superconducting wire forming the outer superconducting conductor layer and electrically connecting the outer superconducting conductor layers to each other,
Between the wire rod arrangement portion and the outer insulation portion,
An intermediate insulating portion formed of an insulating resin,
And an outer wire member disposing portion having an arrangement hole for disposing the outer connecting superconducting wire member on an outer side of the intermediate insulating portion
Intermediate connecting member of superconducting cable.
3. The method according to claim 1 or 2,
Wherein the total number of the superconducting wires for connection is larger than the total number of superconducting wires forming the superconducting conductor layer
Intermediate connecting member of superconducting cable.
3. The method according to claim 1 or 2,
A plurality of the superconducting wires for connection are arranged in one of the arrangement holes and the superconducting wires for connection are integrated
Intermediate connecting member of superconducting cable.
3. The method according to claim 1 or 2,
The insulating resin forming the outer insulating portion may be a fiber-reinforced resin
Intermediate connecting member of superconducting cable.
1. A superconducting cable intermediate connection structure for connecting superconducting cables each comprising a former and a cable core having a superconducting conductor layer formed of superconducting wires on the outer periphery of the former,
The ends of each of the cable cores of the superconducting cable,
An intermediate connecting member for connecting the formers and the superconducting conductor layers exposed from the ends of the cable cores,
An intermediate connection box for accommodating the end portions of the cable cores and the intermediate connection member,
Respectively,
The intermediate connecting member is the intermediate connecting member according to claim 1 or 2,
Wherein the intermediate connecting member is fixed to the intermediate connecting box
Intermediate connection structure of superconducting cable.

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