KR100977405B1 - 3 Phase Superconducting Cable jointing apparatus - Google Patents

Abstract

The present invention relates to an intermediate connection device of a three-phase superconducting cable, and more particularly, to an intermediate connection device of a three-phase superconducting cable for electrically interconnecting cores contained in a cooling tube of a three-phase superconducting cable. A metal sleeve which is inserted into and connected to both ends thereof, a metal cover covering the superconducting conducting layer and the insulating layer of the core interconnected outside the metal sleeve, and a superconducting shielding layer of the core interconnected at the outer circumferential surface of the metal cover. It is coupled to the outside to seal the metal cover and characterized in that it comprises a fixed support for supporting the three-phase core on the inner peripheral surface of the cooling tube, thereby mechanically connecting the former to the metal sleeve, the physical bond strength is remarkably excellent And a superconducting conducting layer with the former Since it is arranged on the outer circumferential surface of the hard metal sleeve, there is no fear of bending, and since the connection of the superconducting conducting layer and the superconducting shielding layer is superconducting, the contact resistance and heat loss are low, and each core is firmly fixed to the fixing support. Warping or deformation of the core is prevented.

Superconducting cable, former, conducting layer, shielding layer, insulation layer, wire rod, metal sleeve, metal cover

Description

Intermediate connection device for three-phase superconducting cable {3 Phase Superconducting Cable jointing apparatus}

The present invention relates to an intermediate connection device of a superconducting cable, and more particularly, to a three-phase superconducting mechanically coupled to improve the physical coupling force of the former corresponding to each phase of the three-phase superconducting cable, and superconducting to lower the bonding resistance and heat loss. The intermediate connection device of the cable.

In general, since superconducting cables use superconducting wires with very low resistance, they have very small power loss compared to conventional cables, and thus can transmit large amounts of power.

However, an intermediate connection device for connecting superconducting cables to each other is essential for long distance power transmission, which has been disclosed by Japanese Patent Laid-Open No. Hei 4-98773, and will be described with reference to FIG. 1 as follows.

1 is a cross-sectional view showing an intermediate connection device of a conventional superconducting cable.

Conventional superconducting device of the superconducting cable is a superconducting wire (42,52) (conductive metal layer (43,44,53,54), superconducting wire layer (45,55)) surrounding the former (41, 51) inside the superconducting cable By cutting shorter, a connecting member 4 having the same laminated structure as the superconducting cable is inserted between the former 41 and the former 51 inherent on each of the two superconducting cables, and both ends of the connecting member 4 at both ends. The formers 41 and 51 of the superconducting cable are joined with silver leads 8 and 9, and the superconducting wires 42 and 52 of both superconducting cables are also joined with silver lead 7 at the same time.

At this time, the connection member 4 is sequentially stacked on the outer periphery of the metal pipe 61, the superconducting wire layer 65, and again the conductive metal layer 64 so as to have the same laminated structure as the superconducting cable.

Therefore, the current supplied to the superconducting wire layer 45 of the superconducting cable flows to the superconducting wire layer 55 of the opposite superconducting cable via the superconducting wire layer 65 of the connecting member 4.

However, since the intermediate connecting device of the conventional superconducting cable connects the connecting member 4 with the formers 41 and 51 of the cable with silver solder 8 and 9, the physical coupling force of the silver solder is weak, so that the superconducting cable can be cooled below a critical temperature. When the heat shrinkage may cause cracks at the interface between the connecting member 4 and the superconducting wires 42 and 52 of both superconducting cables, and the refrigerant flowing at high pressure (about 10 bar) penetrates into the cracks that are physically fragile. As (4) is broken or the contact resistance increases, the cooling load of the cooling system is increased due to an increase in power loss and a temperature increase due to resistance heat, as well as a quench phenomenon, which may cause performance degradation of the superconducting wire.

In addition, when both ends of the connecting member 4 are combined with the formers 41 and 51 and the silver leads 8 and 9 of the superconducting cable, the superconducting cable may be deteriorated due to overheating.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to mechanically connect a former of a three-phase superconducting cable so that the physical coupling force of the intermediate connection is improved and the connection of the superconducting conducting layer is not bent. It is to provide a connection device.

In addition, the superconducting conductive layer and the shielding layer is directly connected to the superconducting device of the three-phase superconducting cable that can significantly reduce the electrical resistance and heat generation.

Another object is to provide an intermediate connection device of a three-phase superconducting cable that is easy to repair the connection of the superconducting cable.

Still another object is to provide an intermediate connection device of a three-phase superconducting cable that can be firmly supported in each phase of the superconducting cable while preventing the twisting or bending of the superconducting cable due to cooling shrinkage.

The present invention for achieving the above object is in the intermediate connection device of the three-phase superconducting cable for electrically interconnecting the core accommodated in the cooling tube of the three-phase superconducting cable, the former of the core to be interconnected is inserted into each end connected A metal sleeve, a metal cover covering the superconducting conducting layer and the insulating layer of the core interconnected outside the metal sleeve, and an outer side of the superconducting shield layer of the core interconnected at the outer surface of the metal cover. Sealing the cover and characterized in that it comprises a fixed support for supporting the three-phase core on the inner peripheral surface of the cooling tube.

Preferably, the metal sleeve is formed in a pipe shape having a partition wall in the center is characterized in that the former is inserted, respectively coupled.

Preferably, the metal sleeve into which the former is inserted is compressed and connected such that the outer diameter of the metal sleeve and the former diameter are the same.

Preferably, the metal cover is characterized in that the cross-section is formed in a container shape of the elliptical shape so as to correspond to the portion in which the insulating layer is wound.

Preferably, the metal cover is characterized in that the combination of the upper cover and the lower cover to facilitate opening and closing.

Preferably, the inner peripheral surface of the upper cover and the lower cover is characterized in that the heat insulating material is further provided to prevent the heat generated from the superconducting shielding layer is transferred to the insulating layer.

Preferably, the fixing support is an upper support covering the upper portion of the metal cover, a lower support covering the lower portion, a lower support coupler for electrically connecting and fixing the lower support to each other, coupled to the upper support and the Characterized in that it consists of a support for supporting in contact with the inner peripheral surface of the cooling tube.

Preferably, the support is fixed to the upper support and the threaded member formed on the outer peripheral surface, the adjusting member for screwing the fixing member and the coupling so that the gap between the cooling tube and each core, and the core to the contraction It characterized in that it is composed of a roller coupled to the upper portion of the adjustment member to be movable in the longitudinal direction and in contact with the inner peripheral surface of the cooling tube.

Preferably, the superconducting wire for connection is further provided to electrically connect the superconducting shielding layers spaced apart from each other.

Effects of the present invention by the above configuration is as follows.

First, since the former is mechanically connected to the left and right superconducting cables by crimping the metal sleeve, the physical bond strength is remarkably superior to that of the conventional soldering.

Second, since the outer diameter of the metal sleeve is the same as the outer diameter of each former after connecting the left and right formers, the superconducting conductive layer arranged on the outer peripheral surface of the former is connected without fear of bending on the outer peripheral surface of the metal sleeve, thereby preventing bending of the superconducting wire.

Third, since the connection of the superconducting conducting layer and the shielding layer is superconducting by low temperature soldering, the electrical contact resistance is low and the heat generation is small.

Fourth, since the metal cover is easy to open and close, it is easy to repair the superconducting shielding layer and the conducting layer.

Fifth, since the cores of the three-phase superconducting cables are firmly fixed to the fixing support after completion of the intermediate connection work, not only the sag of the connection part is prevented, but also the cores can be moved in the longitudinal direction of each core. Can be prevented.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail.

Figure 2 is a cross-sectional view showing an intermediate connection device of the three-phase superconducting cable according to an embodiment of the present invention, Figure 3 is a longitudinal sectional view showing that the connection portion of the three-phase superconducting cable shown in Figure 2 is installed in the cooling tube.

The present invention is largely composed of a metal sleeve 100, a metal cover 110, a fixed support 130 as a structure for electrically and mechanically connecting the three-phase superconducting cable 200 to each other.

In general, the three-phase superconducting cable 200 is composed of a cooling tube 210 and the core 300, the core 300 is a former 310 formed by twisting a plurality of strands of copper strands in the center, and superconducting on the outer peripheral surface The conductive layer 320, the insulating layer 330, the superconducting shielding layer 340, and a protective layer (not shown) are sequentially formed. In addition, the refrigerant flowing in the cooling tube 210 is filled and the three cores (three phase) is arranged in it.

First, the metal sleeve 100 will be described. The metal sleeve 100 has a pipe shape, and an inner diameter thereof has a diameter enough to allow the former 310 to be inserted therein.

The material is metal and copper is usually suitable.

In addition, the metal sleeve 100 is preferably provided with a partition wall 102 at the center of the metal sleeve 100, which is excessive because either of the formers 310 is inserted from both sides. When inserted into the other side, the other one can be inserted less, so that the former 310 on both sides is inserted by the same depth.

Here, the formers 310 to be connected are inserted into both ends of the metal sleeve 100, and the metal sleeve 100 is pressed by a separate press (not shown) so that the outer diameter of the metal sleeve 100 is increased. The outer diameter of the former 310 is equal to that of the former. That is, the outer circumferential surface of the former 310 is connected to the same surface as the outer circumferential surface of the metal sleeve 100.

As such, since the former 310 is mechanically pressurized using the metal sleeve 100, the physical coupling force is much stronger than that of the conventional soldering.

The superconducting conducting layer 320 is arranged in the longitudinal direction of the former 310 and the metal sleeve 100, and the superconducting conducting layer 320 is connected to each other by low temperature soldering, and the superconducting conducting layer 320 of the superconducting conducting layer 320 is connected. The insulating layer 330 is wound on the outside.

In this case, since a stage is not formed between the metal sleeve 100 and the former 310, the superconducting conductive layer 320 is arranged without bending to prevent bending of the superconducting wire in the superconducting conductive layer 320. In addition, the superconducting conductive layer 320 may be directly connected to both sides, but a superconducting wire may be additionally inserted.

Next, the metal cover 110 will be described.

The metal cover 110 is fixed while covering the insulating layer 330, the longitudinal cross-section is circular, but the cross section has a convex oval shape of the center and the interior of the hollow container, the upper cover 112 and the lower cover ( 114).

Referring to the bar shown, the upper cover 112 and the lower cover 114 may be detachably coupled to each other to facilitate opening and closing.

Both ends of the metal cover 110 are partially inserted into the superconducting cable core 300 to be coupled to each other, and are inserted between the insulating layer 330 and the superconducting shielding layer 340.

The material is a conductive metal, copper is generally used.

It is preferable that the heat insulating material 116 is further provided on the inner circumferential surface of the metal cover 110. The heat insulating material 116 is attached to the outer circumferential surface of the metal cover 110, and heat generated from the superconducting shielding layer interconnected with the insulation. Block delivery to layer 330. This is because the insulating layer 330 functions within approximately 130 ° C., so it is necessary to block heat transfer.

The heat insulator 116 may have a pipe shape and generally use fiberglass reinforced plastics (FRP) having excellent heat blocking rate.

Next will be described with respect to the fixed support 130 for supporting each of the cores 300 to prevent the bending of both sides of the connection by the deflection and deflection of the core.

The fixed support 130 is composed of the upper support 132 and the lower support 134, the lower support coupler 136, the support 138.

The upper support 132 covers the upper portion of the metal cover 110, the lower support 134 covers the lower portion of the metal cover 110, the upper support 132 and the lower support 134 are mutually They are fastened on both sides and joined together.

The lower support coupler 136 is coupled to the lower support 134 of each fixed support 130 to hold each core 300 inward. Preferably, each of the cores 300 may be stably fixed to each other by 120 ° as shown in FIG. 3. For reference, the lower support coupler 136 is known and may have various shapes.

In addition, the material of the fixed support 130 is suitable for stainless steel having excellent strength without rust.

In addition, the support 138 is provided on the upper support 132 of each of the fixed support 130 to support each of the core 300 by three points.

One end of the support 138 is fixed on the upper support 132 and the other end abuts the inner circumferential surface of the cooling tube 210. In detail, the support 138 is coupled to the fixing member 138a fixed to the upper support 132 and the fixing member 138a to be movable along the fixing member 138a. The control member 138b, and the roller 138c coupled to the upper control member 138b and movable in the longitudinal direction in contact with the inner circumferential surface of the cooling tube 210.

The fixing member 138a and the adjusting member 138b are preferably screwed together, preferably, the fixing member 138a is a male thread, and the adjusting member 138b is a female thread. Is rotated along the fixing member 138a.

Due to this structure, each of the cores 300 is fixed by the lower support coupler 136 inwardly and is capable of supporting three points on the cooling tube 210 by the supporter 138 outwardly. The core 300 may be firmly supported by adjusting the adjusting member 138b according to the gap between the 300 and the cooling tube 210.

On the other hand, the roller 138c coupled to the upper portion of the adjusting member 138b is rotatable to allow each core 300 to move in the longitudinal direction while being supported from the inner circumferential surface of the cooling tube 210.

This is when each core 300 is cooled by the refrigerant causes a sudden shrinkage, which causes deformation or twist (twist) of the core 300 on both sides to move to one side.

Referring to FIG. 2, when contraction occurs, each core 300 contracts by the same distance in the same direction so that deformation or distortion does not occur. Therefore, since the roller 138c causes the core 300 to slide in the longitudinal direction, each core 300 can move in a fluid manner to prevent deformation and distortion due to cooling contraction.

Meanwhile, in the present invention, when the superconducting shielding layer 340 is mutually spaced apart from each other and is difficult to directly connect, the superconducting shielding layer 340 of both sides to be connected is further provided with a separate connection superconducting wire 120. Can be connected to each other.

The connection superconducting wire 120 is known, and a plurality of Bi2223-based superconducting filaments are usually embedded in a matrix, and thus a detailed description thereof will be omitted.

As shown in FIG. 2, the connecting superconducting wire 120 is arranged in the longitudinal direction on the outer circumferential surface of the metal cover 110 and fixed to the metal cover 110 by general soldering. The length of 120 depends on the separation distance between the superconducting shielding layer 340.

The connection superconducting wire 120 and each superconducting shielding layer 340 are connected by low temperature soldering, which is a superconducting junction, to minimize connection resistance and heat generation.

Hereinafter, the procedure for connecting two three-phase superconducting cables 200 according to the three-phase superconducting cable intermediate connection device according to the present invention will be described.

First, the outer shell (superconducting shielding layer, insulating layer, superconducting conducting layer) is removed from both cores 300 of the three-phase superconducting cable 200 to be connected, and the former 310 is disposed at both ends of the metal sleeve 100. After each insertion, using a crimping tool to press mechanically until the outer diameter of the former 310 and the metal sleeve 100 is matched.

Next, each of the superconducting conductive layers 320 outside the former 310 is longitudinally arranged on the metal sleeve 100 and connected to each other by low temperature soldering.

For reference, the reason for using low-temperature lead (melting point 80 ℃) is that superconducting wire which forms superconducting conductive layer or shielding layer is usually made of stainless or brass wire by using normal lead (melting point 190 ℃). It is preferable to use low-temperature lead composed of Bi (34%) and In (66%) because of electrical and mechanical coupling.

This is because if the lead is used, the melting point of the lead is the same as the melting point of the lead that is used to attach the stainless or brass wires that make up the shell of the superconducting wire. This is because the superconducting wire is locally mechanically damaged by the difference in the coefficient of thermal expansion between the wire rod and the stainless or brass wire, which in turn reduces the critical current of the superconductor.

Next, when the connection of the superconducting conductive layer 320 is completed, the insulating layer composed of kraft paper is wound several times to form the insulating layer 330.

Next, a plurality of superconducting wires 120 for connection are arranged on the outer circumferential surfaces of the upper cover 112 and the lower cover 114 of the metal cover 110 along the length direction, and on the metal cover 110 with normal lead. Solder In this case, the length of the connection superconducting wire 120 may be appropriately selected as long as the length necessary for bonding with the superconducting shielding layer 340.

Both ends of the upper cover 112 and the lower cover 114 to which the connecting superconducting wire 120 is soldered are inserted between the insulating layer 330 and the superconducting shielding layer 340 as described above. After coupling to cover the outer periphery, both ends of the connecting superconducting wire 120 and the superconducting shielding layer 340 are electrically connected to each other by low temperature soldering. In this manner, the superconducting wire of the superconducting shielding layer 340 is connected, thereby minimizing the bonding resistance and heat generation.

Thereafter, the upper support 132 and the lower support 134 of the fixed support 130 are fastened to the metal cover 110, respectively, and the adjustment member so that each core 300 is supported by the support 138. The connection is completed by adjusting 138b to bring the roller 138c into close contact with the inner circumferential surface of the cooling tube 210.

In addition, when the refrigerant is filled in the cooling tube 210, each core moves to one side while cooling and contracting. At this time, the supporting roller is rolled and the core connection part is appropriately fixed and firmly fixed.

As described above, the present invention uses a metal sleeve and a metal cover as a basic technical concept of a connection structure capable of mechanically firmly coupling a three-phase superconducting cable and electrically connecting the same, and the accompanying drawings are provided to describe the present invention. Since only one embodiment, the true technical scope of the present invention should be determined by the claims.

1 is a cross-sectional view showing a structure of an intermediate connection portion of a conventional superconducting cable.

Figure 2 is a cross-sectional view showing an intermediate connection device of a three-phase superconducting cable according to an embodiment of the present invention.

Figure 3 is a longitudinal sectional view showing that the connection portion of the three-phase superconducting cable shown in Figure 2 is installed in the cooling tube.

<< Explanation of symbols for main part of drawing >>

100: metal sleeve 102: bulkhead

110: metal cover 112: top cover

114: lower cover 116: heat insulating material

120: superconducting wire for connection 130: fixed support

132: upper support 134: lower support

136: lower support coupler 138: support

138a: fixing member 138b: adjusting member

138c: Roller 200: Three Phase Superconducting Cable

210: cooling tube 300: core

310: former 320: superconducting conductive layer

330: insulating layer 340: superconducting shielding layer

Claims (9)

In the intermediate connection device of the three-phase superconducting cable for electrically interconnecting the core 300 accommodated in the cooling tube 210 of the three-phase superconducting cable 200, A metal sleeve (100) for allowing the former (310) of the core (300) to be interconnected to be inserted and connected at both ends thereof, A metal cover 110 covering the superconducting conductive layer 320 and the insulating layer 330 of the core 300 interconnected outside the metal sleeve 100; Coupled to the outside of the superconducting shielding layer 340 of the core 300 interconnected from the outer circumferential surface of the metal cover 110 to seal the metal cover 110 and the three-phase core 300 on the inner peripheral surface of the cooling tube 210 The intermediate connection device of the three-phase superconducting cable, characterized in that it comprises a fixed support 130 for supporting. The method of claim 1, The metal sleeve 100 has a pipe shape in which a partition wall 102 is formed at the center thereof, and the former 310 is connected to each other by inserting and combining the former. The method of claim 2, Intermediate connecting device of the three-phase superconducting cable, characterized in that the metal sleeve 100 is inserted into the former is compressed so that the outer diameter of the metal sleeve 100 and the former 310 is the same. . The method of claim 1, The metal cover 110, Intermediate connection device for a three-phase superconducting cable, characterized in that the cross-sectional shape is made of a container shape so that the insulating layer 330 corresponds to the wound portion. The method of claim 4, wherein The metal cover 110 is an intermediate connection device of the three-phase superconducting cable, characterized in that made of a combination of the upper cover 112 and the lower cover 114 for easy opening and closing. The method of claim 5, The inner circumferential surfaces of the upper cover 112 and the lower cover 114 are further provided with a heat insulator 116 to prevent heat generated from the superconducting shielding layer 340 from being transferred to the insulating layer 330. Intermediate connector for three-phase superconducting cables. The method of claim 1, The fixed support 130 is an upper support 132 to cover the upper portion of the metal cover 110, the lower support 134 to cover the lower, and the lower support 134 is electrically connected and fixed to each other. Intermediate connecting device of the three-phase superconducting cable, characterized in that composed of a lower support coupler (136), and a support (138) coupled to the upper support (132) and supported in contact with the inner peripheral surface of the cooling tube (210). The method of claim 7, wherein The support 138 is fixed to the upper support 132 and the fixing member 138a having a screw thread formed on the outer circumferential surface, and the fixing member to be able to adjust the gap between the cooling tube 210 and each of the core 300 ( An adjustment member 138b for screwing to 138a and a roller 138c coupled to an upper portion of the adjustment member 138b and contacting the inner circumferential surface of the cooling tube such that the core 300 is movable in the longitudinal direction by contraction. Intermediate connection device of the three-phase superconducting cable, characterized in that the configuration. 9. The method according to any one of claims 1 to 8, A superconducting wire for connecting three-phase superconducting cable, characterized in that it is further provided to electrically connect the superconducting shielding layer 340 spaced apart from each other.

Images