WO2020253086A1

WO2020253086A1 - Ybco superconducting-material-based superconduction cable end-portion connection structure

Info

Publication number: WO2020253086A1
Application number: PCT/CN2019/119148
Authority: WO
Inventors: 包颖; 袁文; 蔡渊; 莫思铭; 程鹏; 陈慧娟; 王艳梅
Original assignee: 东部超导科技（苏州）有限公司; 苏州新材料研究所有限公司; 江苏永鼎股份有限公司
Priority date: 2019-06-19
Filing date: 2019-11-18
Publication date: 2020-12-24
Also published as: CN110265802B; CN110265802A

Abstract

A YBCO superconducting-material-based superconduction cable end-portion connection structure. A superconduction cable is sequentially provided with a line core (1), a first low-temperature cold insulation layer (2), a superconduction layer (3), a second low-temperature cold insulation layer (4), a support ring (5), a low-temperature pipeline (6), an armoring copper wire (7), and an outer protection layer (8) along a radial direction of the superconduction cable from inside to outside, wherein an end portion of the superconduction cable is provided with a cutoff sheath (11). The end-portion connection structure comprises: the line core (1) penetrates through a hollow copper pipe (17) for connection, the low-temperature cold insulation layers (2, 4) and the superconduction layer (3) are all connected by means of spiral winding, the low-temperature pipeline (6) is directly abutted, the outer protection layer is extruded outside the connected low-temperature pipeline (6), and a fastening ring (15) is pulled and the fastening ring (15) is tightly fixed on a connection end to complete connection. In the field of superconduction cable connection, the end-portion connection structure is convenient for operation, wear of the superconduction cable is reduced, the occurrence of Joule loss is reduced, and heat leakage due to electrical connection of an external current lead is also reduced.

Description

A superconducting cable end connection structure based on YBCO superconducting material

Technical field

The invention relates to the technical field of superconducting cables, in particular to a superconducting cable end connection structure based on YBCO superconducting material.

Background technique

The superconducting cable is designed and manufactured by using the characteristics of superconducting to become a zero-resistance superconducting state at its critical temperature, high current density, and capable of carrying large currents. Superconducting cables are new types of cables on the market, and a single superconducting cable has a limited length and requires multiple connections for long-distance laying. When connecting, it needs to be connected through the connection of the current-carrying layer, the connection of the cold insulation layer and the connection of the low-temperature layer pipeline.

In the market for superconducting cables, a new type of superconducting cable made of YBCO superconducting material has appeared. The cable is based on YBCO superconducting material. The superconducting cable is currently in use on the market. When there are the following defects:

1. When connecting two superconducting cables, it is necessary to directly cut and cut the outer outer sheath directly. An external cutting device must be used to affect the installation and connection time;

2. It is inconvenient to connect two superconducting cables, and the cores of the connection are likely to be exposed, which increases the probability of accidents;

3. Adopting resistive welding will introduce Joule loss;

4. The electrical connection of the external current leads will cause large heat leakage.

Summary of the invention

The purpose of the present invention is to provide a superconducting cable end connection structure based on YBCO superconducting material, which is suitable for superconducting-superconducting connection, so as to solve the problem that the connection cores in the current market proposed by the above-mentioned background technology are relatively complicated, and are different from superconducting cables. The problem of inconvenient connection of the guide cable.

In order to achieve the above objectives, the present invention provides the following technical solutions:

A superconducting cable end connection structure based on YBCO superconducting material. The superconducting cable is sequentially provided with a core, a first low-temperature cold insulation layer, a superconducting layer, and a second low-temperature cold insulation along its radial direction from the inside to the outside Layer, support ring, low-temperature pipeline, armored copper wire and outer protective layer; the end connection structure includes:

The cores at the ends of adjacent superconducting cables are connected through the hollow copper tube;

On the outer side of the hollow copper tube, the first low-temperature cold insulation layers at the ends of adjacent superconducting cables are spirally wound with carbon paper or cold insulation materials to complete the connection;

On the outside of the first low-temperature cold insulating layer, the superconducting layers at the ends of the adjacent superconducting cables are connected by spiral winding of YBCO superconducting tape. After the spiral winding is completed, the two ends of the superconducting layer connection ends are welded connection;

On the outer side of the superconducting layer connection end, the second low-temperature cold insulation layers of adjacent superconducting cable ends are also connected by carbon paper or cold insulation material half-wrapped spiral winding;

Integrating the superconducting cable with the second low-temperature cold insulation layer connected inside the low-temperature connecting pipe, and butting the connecting low-temperature pipe with the low-temperature pipes at the ends of the superconducting cable at both ends to form a low-temperature pipe connection end;

Extruding an outer protective layer on the outer surface of the connecting end of the low-temperature pipeline to obtain a conversion joint;

The outer sheath of the superconducting cable end is also provided with a connecting sleeve and a fastening ring. The connecting sleeve and the fastening ring are both sleeved on the outside of the superconducting cable outer sheath, and the connecting sleeve is connected by an elastic connecting rope. Connect the fastening ring. When two superconducting cables are connected, the connecting sleeve is fixed at the end of the superconducting cable. Pull the fastening ring and fasten the fastening ring to the conversion On the outer surface of the joint.

Further, the end of the superconducting cable is provided with a cut-off sheath, the cut-off sheath has a multi-layer structure, and the layer structure of the cut-off sheath arranged from the inside to the outside along the radial direction is consistent with the superconducting Corresponding to the cable, the layer structure of the truncated sheath except the core and the corresponding layer structure of the superconducting cable are all connected by a virtual disconnection; when two adjacent superconducting cables are connected, the said The sheath is cut off, and the end of the superconducting cable exposes the copper armor wire, the supporting ring, the high-voltage layer, the superconducting layer, the high-voltage insulating layer and the low-temperature pipeline in sequence.

Further, there is no difference in diameter between the cryogenic pipe for connection and the cryogenic pipes at the ends of the superconducting cables at both ends.

Further, a copper ring is used for knife edge sealing on the outside of the connection between the cryogenic pipe for connection and the cryogenic pipe at the ends of the superconducting cable at both ends.

Further, the connecting surface of the connecting cryogenic pipe and the cryogenic pipe at the ends of the superconducting cables at both ends is an inclined surface.

Further, the hollow copper tube is a compacted copper tube to connect the cores to each other.

Further, the fastening ring is made of elastic material.

Further, both the connecting sleeve and the fastening ring are provided with positioning holes adapted to the connecting rope.

Compared with the prior art, the beneficial effects of the present invention are:

1) The superconducting cable of the present invention is provided with a truncated sheath at the end, and when the superconducting cable layer structure is sequentially cut, force is applied to the truncated sheath connected to the end of the superconducting cable through the virtual disconnection line to cut off the sheath Rotating and tearing, the cut-off sheath is separated from the end of the superconducting cable, so that the cut-off sheath can be directly peeled off, reducing the use of external equipment and reducing the wear of the superconducting cable.

2) The cores are connected by rotating inside the hollow copper tube, which avoids the problem of core exposure.

3) After the superconducting cable is connected, pull the fastening ring on the outside of the adapter. The connecting rope driven by the fastening ring is buckled with the corresponding positioning hole. The fastening ring is sleeved on the outer surface of the adapter to directly protect the adapter. To make the connection safer and more convenient.

4) Both the first low-temperature cold insulation layer and the second low-temperature cold insulation layer are connected with carbon paper or cold insulation materials to reduce heat leakage when the external current leads are electrically connected.

5) The low-temperature pipeline is cut into inclined surfaces for butt joints, and a copper ring is used for knife-edge sealing in the middle to enhance the sealing performance.

6) The superconducting layer adopts external lap welding to bridge a section of superconducting cable to reduce the occurrence of Joule loss;

7) When the superconducting cable of the present invention is connected, the resistance can be reduced to 10 ^-7 ohm/n, where n is the number of parallel spiral wound superconducting tapes.

Description of the drawings

Figure 1 is a schematic diagram of the main structure of the superconducting cable according to the present invention;

2 is a schematic diagram of the cross-sectional structure of the superconducting cable according to the present invention;

Fig. 3 is a schematic diagram of the connection structure of the cable and the conversion joint according to the present invention;

4 is a schematic diagram of the unfolded structure of the fastening ring and the connecting sleeve when adjacent superconducting cables are connected according to the present invention;

5 is a schematic diagram of the internal connection structure of the core in the hollow copper tube according to the present invention;

Figure 6 is a schematic diagram of the low-temperature pipeline connection structure of the present invention;

Figure 7 is a schematic diagram of the superconducting layer connection structure of the present invention;

In the picture: 1. Wire core, 2. The first low temperature cold insulation layer, 3. Superconducting layer, 4. The second low temperature cold insulation layer, 5. Support ring, 6. Low temperature pipeline, 7. Armored copper wire, 8. , Outer sheath, 10, conversion joint, 11, cut off sheath, 12, virtual disconnection, 13, connection sleeve, 14, elastic connecting rope, 15, fastening ring, 16, positioning hole, 17, hollow copper pipe, 18. Knife edge, 19. Superconducting connection end.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

The present invention discloses a superconducting cable based on YBCO superconducting material. As shown in Figures 1 and 2, the superconducting cable is provided with a core 1 and a first low-temperature cold insulating layer 2 in order from the inside to the outside along its radial direction. , Superconducting layer 3, second low temperature cold insulating layer 4, support ring 5, low temperature pipeline 6, armored copper wire 7 and outer protective layer 8.

Wherein, the core 1 is formed by twisting a plurality of copper wires with a diameter of 1 mm, and the copper wires are pure electrical copper. The first low-temperature cold insulating layer 2 and the second low-temperature cold insulating layer 4 are made of cold insulating material half-wrapped spirally, and the cold insulating material can be PPLP (polypropylene laminated paper) or polyamide. The imine film, the first low-temperature cold insulating layer 2 is wound on the outer surface of the core 1. The superconducting layer 3 is a multi-layer parallel spiral wound structure of YBCO high temperature superconducting tape, which is wound on the outer surface of the first low temperature cold insulating layer 2. The second low-temperature cold insulating layer 4 is wound on the outer surface of the superconducting layer 3. The support ring is a support ring structure with an interval width of 10 cm and is made of tetrafluoroethylene material. The support ring is directly sleeved on the outside of the second low-temperature cold insulating layer 4. The core 1, the first low-temperature cold insulating layer 2, the superconducting layer 3, the second low-temperature cold insulating layer 4, and the support ring 5 are integrated inside the low-temperature pipeline 6, and the low-temperature pipeline is a corrugated vacuum Dewar tube , And flexible vacuum pipeline structure, its material is double-layer non-magnetic stainless steel corrugated pipe, and its sandwich is vacuum. The armored copper wire is spirally wound on the outside of the cryogenic pipeline 6. The outer sheath is a one-time extruded cable insulation straight pipe structure, and its material is cross-linked polyethylene.

A number of signal receiving slots 9 are evenly arranged on the inner side of the superconducting layer 7 for transmitting voltage signals.

A superconducting cable end connection structure based on YBCO superconducting material, including:

The cores 1 at the ends of the adjacent superconducting cables are connected through the hollow copper tube 17 as shown in FIG. 5. Wherein, the hollow copper tube 17 is a compacted copper tube to connect the cores 1 to each other.

On the outside of the hollow copper tube 17, carbon paper or cold insulating material is used between the first low-temperature cold insulating layers 2 at the ends of adjacent superconducting cables to be half-stacked according to the pitch of the first low-temperature cold insulating layer 2 The connection is completed by spiral winding, and the connection end of the first low-temperature cold insulating layer 2 is obtained.

On the outside of the connecting end of the first low-temperature cold insulating layer 2, the superconducting layers at the ends of the adjacent superconducting cables are connected by spiral winding of YBCO superconducting tape. After the spiral winding is completed, the two superconducting layers are connected to the ends of the superconducting layer. The ends are welded and connected, as shown in Figure 7.

On the outside of the connecting end of the superconducting layer, carbon paper or cold insulating material is also used between the second low-temperature cold insulating layers 4 at the ends of adjacent superconducting cables to be half-stacked according to the pitch of the second low-temperature cold insulating layer 4 The package is spirally wound to complete the connection, and the connection end of the second low-temperature cold insulating layer 4 is obtained.

The connecting end of the second low-temperature cold insulating layer 4 is integrated into the connecting low-temperature pipe, and the connecting low-temperature pipe is butted with the low-temperature pipe 6 at the ends of the superconducting cable at both ends to form a low-temperature pipe connection end, wherein the connecting low-temperature pipe There is no difference in diameter between the pipe and the low-temperature pipe 6 at the ends of the superconducting cable at both ends, as shown in FIG. 6. A copper ring is used for knife-edge sealing on the outside of the connection between the cryogenic pipe for connection and the cryogenic pipe at the ends of the superconducting cable at both ends. The connecting surface of the low temperature pipe for connection and the low temperature pipe at the ends of the superconducting cable at both ends is an inclined surface, thereby enhancing the sealing performance.

An outer protective layer is extruded on the outer surface of the connecting end of the low-temperature pipeline to obtain the conversion joint 10.

A connecting sleeve 13 and a fastening ring 15 are also provided on the outer side of the outer sheath 8 of the superconducting cable end. The connecting sleeve 13 and the fastening ring 15 are both sleeved on the outer side of the superconducting cable outer sheath, and the connection The sleeve 13 is connected to the fastening ring 15 by an elastic connecting rope 14. Fix the connecting sleeve 13 at the end of the superconducting cable, pull the fastening ring 15 and fasten the fastening ring 15 on the outer surface of the outer sheath of the conversion joint. The connecting rope 14 covers the outer surface of the conversion joint to complete the connection of the superconducting cable, as shown in FIG. 4. Wherein, the fastening ring 15 is made of elastic material. Both the connecting sleeve 13 and the fastening ring 15 are provided with positioning holes 16 adapted to the connecting rope.

Preferably, the end of the superconducting cable is provided with a cut-off sheath 11, the cut-off sheath 11 is a multilayer structure, and the cut-off sheath 11 is arranged radially from the inside to the outside of the layer structure and the Corresponding to the superconducting cable, the layer structure of the truncated sheath 11 other than the core 1 and the corresponding layer structure of the superconducting cable are all connected by a virtual disconnection 12; when two adjacent superconducting cables are connected , The cut off sheath 11 is directly torn off, and the end of the superconducting cable exposes the armored copper wire, the support ring, the high voltage layer, the superconducting layer, the high voltage insulation layer and the low temperature pipeline in sequence. In this way, the diameter reduction process of the wire core 1 can be implemented directly, thereby reducing the cutting use of external equipment and reducing the wear of the superconducting cable.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

A superconducting cable end connection structure based on YBCO superconducting material, characterized in that: the superconducting cable is provided with a core (1) and a first low-temperature cold insulating layer (2) in order from the inside to the outside along the radial direction. , Superconducting layer (3), second low-temperature cold insulating layer (4), support ring (5), low-temperature pipe (6), armored copper wire (7) and outer sheath (8); the end connection The structure includes:

The cores (1) at the ends of adjacent superconducting cables are connected through the hollow copper tube (17);

On the outside of the hollow copper tube (17), the first low-temperature cold insulation layer (2) at the ends of adjacent superconducting cables is spirally wound by using carbon paper or cold insulation material to complete the connection;

On the outside of the first low-temperature cold insulating layer (2), the superconducting layers at the ends of adjacent superconducting cables are connected by spiral winding of YBCO superconducting tape. After the spiral winding is completed, the superconducting layer at the end of the superconducting layer is connected Welding connection at both ends;

On the outer side of the superconducting layer connection end, the second low-temperature cold insulation layer (4) of the adjacent superconducting cable ends is also connected by carbon paper or cold insulation material half-wrapped spiral winding;

The superconducting cable with the second low-temperature cold insulation layer (4) connected is integrated into the low-temperature connecting pipe, and the connecting low-temperature pipe is connected with the low-temperature pipes (6) at the ends of the superconducting cable at both ends to form a low-temperature pipe Connecting end

Extruding a layer of outer protective layer on the outer surface of the connecting end of the low-temperature pipeline to obtain a conversion joint (10);

The outer sheath (8) of the superconducting cable end is also provided with a connecting sleeve (13) and a fastening ring (15). The connecting sleeve (13) and the fastening ring (15) are both sleeved on the superconducting cable. Outside the outer sheath of the cable, and the connecting sleeve (13) is connected to the fastening ring (15) by an elastic connecting rope (14). When two superconducting cables are connected, the connecting sleeve (13) is fixed on the The end of the superconducting cable does not move, pull the fastening ring (15) and fasten the fastening ring (15) on the outer surface (10) of the conversion joint.
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: the end of the superconducting cable is provided with a truncated sheath (11), and the truncated sheath (11) ) Is a multilayer structure, and the layer structure of the cut-off sheath (11) arranged from the inside to the outside in the radial direction corresponds to the superconducting cable, and the cut-off sheath (11) except for the core (1) The layer structure other than) and the corresponding superconducting cable layer structure are all connected by a virtual disconnection (12); when two adjacent superconducting cables are connected, the truncated sheath (11) is directly torn off, so The ends of the superconducting cable are sequentially exposed with armored copper wires, a support ring, a high voltage layer, a superconducting layer, a high voltage insulating layer and a low temperature pipeline.
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: there is no difference in diameter between the low temperature pipe for connection and the low temperature pipes (6) at the ends of the superconducting cable at both ends .
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: copper is used on the outside of the connection between the low temperature pipe for connection and the low temperature pipe at the ends of the superconducting cable at both ends. The ring performs knife edge sealing.
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: the connecting surface of the connecting cryogenic pipe and the cryogenic pipe at the ends of the superconducting cable at both ends is an inclined surface.
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: the hollow copper tube (17) is a compressed copper tube to connect the cores (1) to each other .
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that the fastening ring (15) is made of elastic material.
A superconducting cable end connection structure based on YBCO superconducting material according to claim 1, characterized in that: the connecting sleeve (13) and the fastening ring (15) are both provided with the connecting rope Compatible positioning holes (16).