CN110648800A

CN110648800A - Superconducting cable system

Info

Publication number: CN110648800A
Application number: CN201910905689.5A
Authority: CN
Inventors: 吴小辰; 胡子珩; 章彬; 汪桢子; 汪伟; 王哲; 魏前虎; 陈腾彪
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-01-03

Abstract

The present application relates to a superconducting cable system. The superconducting cable system comprises a low-temperature Dewar pipe, a traction protective sleeve and a power-on conductor. The traction protective sleeve is detachably connected with the low-temperature Dewar pipe and encloses a containing cavity together with the low-temperature Dewar pipe. The electrified conductor is arranged in the accommodating cavity. The superconducting cable system can protect part of the electrified conductor which is arranged in the containing cavity and exceeds the low-temperature Dewar pipe by arranging the traction protective sleeve. The traction protective sleeve is detachably connected with the low-temperature Dewar pipe, so that the installation and connection of the electrified conductor and the low-temperature Dewar pipe and the power equipment after the superconducting cable system is transported to a destination are facilitated. The traction protective sleeve can avoid abrasion and stress of the electrified conductor in the transportation process, and the service life of the electrified conductor in the superconducting cable system is prolonged.

Description

Superconducting cable system

Technical Field

The present application relates to the field of power transmission technologies, and in particular, to a superconducting cable system.

Background

In the superconducting cable, after the low-temperature Dewar pipe is connected with the terminal, the electrified conductor can continue to extend into the terminal to be connected with the current lead, and the low-temperature shrinkage rates of the electrified conductor and the low-temperature Dewar pipe are different. Therefore, the length of the current conductor is greater than the length of the low temperature dewar tube.

In the prior art, the superconducting cable body is generally integrated in a factory asynchronous integration mode, that is, the superconducting cable body needs to be transported to an installation and laying site, and the transportation process may cause damage to a part of an electrified conductor, which is longer than a low-temperature dewar pipe.

Disclosure of Invention

In view of this, it is necessary to provide a superconducting cable system that can solve the problem that a portion of a current-carrying conductor longer than a low-temperature dewar tube may be damaged during transportation of a superconducting cable main body.

The present application provides a superconducting cable system, comprising:

a low temperature dewar tube;

the traction protective sleeve is detachably connected with the low-temperature Dewar pipe and forms an accommodating cavity together with the low-temperature Dewar pipe; and

and the electrified conductor is arranged in the accommodating cavity.

In one embodiment, the traction protective sleeve comprises:

the protective sleeve assembly is detachably connected with the low-temperature Dewar pipe and comprises a head and at least one sleeve; and

the expansion joint is arranged between every two adjacent sleeves or between the head and the sleeves, and the expansion joint is fixedly connected with the head and the sleeves and used for increasing the axial telescopic distance and the radial bending degree of the traction protective sleeve.

In one embodiment, the expansion joint is a bellows expansion joint.

In one embodiment, the expansion joint is flanged to the head and/or the sleeve.

In one embodiment, the material of the head, the sleeve and the expansion joint is metal.

In one embodiment, the expansion joint is a bent pipe expansion joint.

In one embodiment, the superconducting electrical cable system further includes a handle disposed at the header.

In one embodiment, the handle is a pull ring.

In one embodiment, the pull ring is welded to the head.

In one embodiment, the traction protection sleeve is connected with the low-temperature Dewar pipe through a flange.

In one embodiment, the pulling sock is the same inner diameter as the cryogenic dewar.

The superconducting cable system can protect the electrified conductor which is arranged in the containing cavity and exceeds the low-temperature Dewar pipe by arranging the traction protective sleeve. The traction protective sleeve is detachably connected with the low-temperature Dewar pipe, so that the electrified conductor and the low-temperature Dewar pipe can be conveniently installed with power equipment respectively after the superconducting cable system is transported to a destination. Therefore, the arrangement of the traction protective sleeve can avoid the abrasion and stress of the electrified conductor in the transportation process, and the service life of the electrified conductor in the superconducting cable system is prolonged.

Drawings

Fig. 1 is a schematic cross-sectional view of a superconducting cable system according to an embodiment of the present application;

fig. 2 is a schematic structural view of an external appearance of a superconducting cable system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an external appearance of another superconducting cable system according to an embodiment of the present application.

Description of the reference numerals

100 superconducting cable system

10 low-temperature Dewar pipe

20 traction protective sleeve

210 accommodating chamber

220 protective sleeve barrel assembly

221 head part

222 sleeve

230 expansion joint

30 current conductor

40 handle

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-2, a superconducting electrical cable system 100 is provided. Superconducting electrical cable system 100 includes cryogenic dewar 10, pulling sock 20, and energized conductor 30. The traction protection sleeve 20 is detachably connected with the low-temperature dewar pipe 10, and encloses a containing cavity 210 together with the low-temperature dewar pipe 10. The current-carrying conductor 30 is disposed in the accommodation chamber 210.

It is understood that the low temperature dewar pipe 10 may have a double-layered structure, i.e., an inner pipe and an outer pipe, and a plurality of layers of heat insulating materials are disposed between the inner pipe and the outer pipe, so as to isolate the influence of the external environment on the superconducting performance of the current-carrying conductor 30 disposed inside the low temperature dewar pipe 10. The energizing conductor 30 is a conductive part in the superconducting cable, and in the present embodiment, the energizing conductor 30 may be a three-phase coaxial cable. The three-phase coaxial cable is formed by sequentially winding an insulating layer, a three-phase superconducting layer, an insulating layer, a shielding layer and a protective layer on a flexible cable framework from inside to outside, and the insulating layer is also wound between every two superconducting layers in the three-phase superconducting layer. When cooling down three-phase coaxial cable, can fill the liquid nitrogen in to low temperature dewar pipe 10, the liquid nitrogen can flow in along flexible cable skeleton inner wall to follow the passageway outflow between electrified conductor 30 surface and the low temperature dewar pipe 10 inner tube, thereby accomplish the circulation of liquid nitrogen to electrified conductor 30 cooling process. In the above process, if the current-carrying conductor 30 is worn or damaged due to excessive tension, the insulation performance of the outer insulation layer is weakened, and the liquid nitrogen cannot meet the insulation requirement, so that the superconducting performance or the service life of the current-carrying conductor 30 is affected.

In the superconducting cable system 100 provided by the present application, the current-carrying conductor 30 is disposed inside the low-temperature dewar tube 10, and a part of the current-carrying conductor 30 may extend outside the low-temperature dewar tube 10, which facilitates the connection between the current-carrying conductor 30 and the power equipment during the laying of the superconducting cable. Therefore, in the present embodiment, the length of the pulling protection jacket 20 is generally larger than the length of the portion of the current-carrying conductor 30 beyond the low-temperature dewar 10, and there is no mechanical connection relationship between the current-carrying conductor 30 and the pulling protection jacket 20, so that the current-carrying conductor 30 can be prevented from being damaged by the force applied thereto during the process of laying the superconducting cable. It can be understood that the traction protection sleeve 20 and the low-temperature dewar pipe 10 can comprehensively protect the electrified conductor 30, prevent moisture, dust and the like from entering the low-temperature dewar pipe 10, and simultaneously prevent the electrified conductor 30 from being damaged due to abrasion and stress in the laying process of the superconducting cable, thereby ensuring the stability of the superconducting performance of the electrified conductor 30.

It is to be understood that the present application does not limit the shape of the pulling sock 20 as long as it can meet the requirements of the superconducting cable transportation process. In one embodiment, the cross-sectional shape of the pulling sheath 20 may be square, and the side length of the square may be greater than the length of the outer diameter of the low temperature dewar pipe 10, so as to facilitate the fixed connection and sealing between the pulling sheath 20 and the low temperature dewar pipe 10. In one embodiment, the pulling sock 20 may also be cylindrical and the inner diameter of the pulling sock 20 and the cryogenic dewar 10 may be the same. In this embodiment, the cylindrical pulling sheath 20 can ensure good stability and sealing property after being connected to the cryogenic dewar 10, thereby ensuring the superconducting performance of the superconducting cable system 100. It can be understood that the inner diameter of the pulling protection sleeve 20 can be reduced appropriately on the premise of ensuring the connection strength and sealing performance of the pulling protection sleeve 20 and the cryogenic dewar 10, thereby saving the material required for pulling the protection sleeve 20 and reducing the cost of the superconducting cable system 100. It should be noted that the specific shape design and material selection of the pulling sock 20 should be made in consideration of the stability of the connection between the pulling sock 20 and the cryogenic dewar 10 and the pulling force that the pulling sock 20 can withstand during the cabling process.

In one embodiment, superconducting electrical cable system 100 may further include a seal. The sealing part can be arranged at one end of the low-temperature dewar pipe 10 far away from the traction protective sleeve 20, and can be detachably connected with one end of the low-temperature dewar pipe 10 far away from the traction protective sleeve 20, namely the sealing part can be used as the terminal seal of the low-temperature dewar pipe 10. Because the traction protective sleeve 20 can be used for traction and protection in the laying process of the superconducting cable, the traction protective sleeve 20 can prevent the part of the electrified conductor 30, which exceeds the low-temperature Dewar pipe 10, from being worn, and can prevent the electrified conductor 30 from being stressed in the laying and traction process, thereby protecting the electrified conductor 30 to the maximum extent. In this embodiment, the sealing portion, the low temperature dewar 10 and the pulling protection sheath 20 may form a sealed chamber together to prevent moisture or dust in the air from entering, so as to realize all-directional protection of the current-carrying conductor 30.

By providing the pulling protection sleeve 20, the superconducting cable system 100 can protect the portion of the current-carrying conductor 30 that is disposed in the accommodation chamber 210 and beyond the cryogenic dewar 10. The traction protective sleeve 20 is detachably connected with the low-temperature dewar pipe 10, so that the electrified conductor 30 and the low-temperature dewar pipe 10 can be conveniently installed and connected with power equipment after the superconducting cable system 100 is transported to a destination. The traction protective sleeve 20 can avoid abrasion and stress of the electrified conductor 30 in the transportation process, and the service life of the electrified conductor 30 is prolonged.

Referring also to fig. 3, in one embodiment, the traction sleeve 20 includes a sleeve barrel assembly 220 and an expansion joint 230. The protection sleeve assembly 220 is removably connected to the cryogenic dewar 10 and the protection sleeve assembly 220 includes a head 221 and at least one sleeve 222. The expansion joint 230 is disposed between every two adjacent sleeves 222 or between the head 221 and the sleeve 222, and the expansion joint 230 is fixedly connected with the head 221 and the sleeve 222 for increasing the axial telescopic distance and the radial bending of the traction protection sleeve 20. In one embodiment, the head 221 of the protective sleeve barrel assembly 220 may be circular arc-shaped, the sleeve 222 may be cylindrical, and the diameter of the opening of the circular arc-shaped head 221 and the diameter of the sleeve 222 are the same as the diameter of the low-temperature dewar 10. It is understood that the materials of the head 221 and sleeve 222 of the protective sleeve cartridge assembly 220 may be the same or different. In one embodiment, the material of the head 221 and sleeve 222 of the protective sleeve barrel assembly 220 may be metal. The head 221 and the sleeve 222 of the protective sleeve barrel assembly 220 may be welded to the expansion joint 230, respectively, and the welding may ensure the reliability of the mechanical connection of the head 221 and the sleeve 222 to the expansion joint 230, respectively.

The traction sleeve 20 may have one or more expansion joints 230 at its intermediate position. It will be appreciated that the expansion joint 230 is a flexible element that can effectively compensate for axial deformation, which has the advantage of being axially compliant and easily deformable. It will be appreciated that the expansion joint 230 may expand and contract in an axial direction and may also flex to a certain extent, i.e., may flex in a radial direction. In one embodiment, in order to prevent the expansion joint 230 from exceeding the allowable compensation amount, a limiting device may be provided at both ends of the expansion joint 230, so as to limit the maximum deformation amount of the expansion joint 230. The expansion joint 230 can improve the practicability of the traction protection sleeve 20, that is, the flexibility of the traction protection sleeve 20 can be improved on the premise of protecting the electrified conductor 30, so that the superconducting cable system 100 can be conveniently transported in the process of laying the superconducting cable, and the phenomenon that the strength damage, the instability damage, the pipe pull-off damage and the like are generated on the traction protection sleeve 20 in the laying process is avoided.

In one embodiment, the expansion joint 230 is a bellows expansion joint. It will be appreciated that the bellows-type expansion joint may be made of a metal bellows which can flex in the direction of the pipe axis, yet allows for a small amount of bending. In one embodiment, the bellows expansion joint may be an axial bellows expansion joint. The corrugated expansion joint mainly depends on the corrugated pipe to realize the telescopic function, and the corrugated pipe can have the stretching, compressing or bending effects by carrying out different designs and combinations on the corrugated pipe, so that the corrugated expansion joint with three basic forms of axial, transverse and angular directions can be obtained. In this embodiment, the type or combination of bellows expansion joints may be selected as appropriate depending on the particular needs of the cabling process. In one embodiment, the expansion joint 230 may also be a bent-tube expansion joint. The elbow type expansion joint is an expansion joint which utilizes the elastic deformation capacity of a body for compensation and has the advantages of high strength and long service life.

In one embodiment, the expansion joint 230 is flanged to the head 221 and/or the sleeve 222. It will be appreciated that the expansion joint 230 and the sleeve 222 may be provided with a flange at each end, and the head 221 may be provided with a flange at one end. When the expansion joint 230 is flanged to the head 221 and/or the sleeve 222, a flange pad may be disposed between the two flanges, and the two flanges are tightened to be tightly coupled using bolts. It can be understood that the flange connection has the advantages of convenient disassembly, good tightness and the like.

In one embodiment, the material of the head 221, sleeve 222, and expansion joint 230 is metal. It will be appreciated that the use of metallic materials for the head 221, sleeve 222 and expansion joint 230 may improve the mechanical strength of the traction sleeve 20. In one embodiment, the material of the head 221, sleeve 222, and expansion joint 230 of the pulling sock 20 may be the same as the material of the low temperature shingle.

In one embodiment, the superconducting electrical cable system 100 further includes a handle 40 disposed at the head 221. It will be appreciated that the provision of the handle 40 facilitates pulling of the pulling sock 20, thereby pulling the superconducting electrical cable system 100 during cabling. In one embodiment, the handle 40 is a pull ring. The pulling eye may be welded directly to the head 221 of the pulling sock 20 or may be secured to the head 221 of the pulling sock 20 by mechanical means such as bolts.

In one embodiment, the pulling sock 20 is flanged to the cryogenic dewar 10. It will be appreciated that during the laying of the superconducting cable, the superconducting cable system 100 is first transported to a designated location, and then the pulling sock 20 needs to be removed from the cryogenic dewar 10. At this time, the energizing conductor 30 is longer than the low-temperature dewar pipe 10, and the end of the energizing conductor 30 longer than the low-temperature dewar pipe 10 is connected to the electric power equipment to be installed, and the laying of the superconducting cable can be completed. It will be appreciated that the flanged connection of the cryogenic dewar 10 to the pulling sock 20 facilitates the removal of the protective device from the cryogenic dewar 10. Meanwhile, the low-temperature dewar pipe 10 and the traction protective sleeve 20 are connected by flanges, so that the traction protective sleeve 20 can be conveniently recycled, and resources can be saved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A superconducting electrical cable system comprising:

a cryogenic dewar tube (10);

the traction protective sleeve (20) is detachably connected with the low-temperature Dewar pipe (10) and encloses an accommodating cavity (210) together with the low-temperature Dewar pipe (10); and

an energizing conductor (30) disposed within the receiving cavity (210).

2. Superconducting cable system according to claim 1, characterized in that the traction protection sheath (20) comprises:

a protective sleeve barrel assembly (220) removably connected with the cryogenic dewar tube (10), the protective sleeve barrel assembly (220) comprising a head (221) and at least one sleeve (222); and

the expansion joint (230) is arranged between every two adjacent sleeves (222) or between the head (221) and the sleeves (222), and the expansion joint (230) is fixedly connected with the head (221) and the sleeves (222) and is used for increasing the axial telescopic distance and the radial bending of the traction protective sleeve (20).

3. The superconducting electrical cable system of claim 2 wherein the expansion joint (230) is a bellows expansion joint.

4. Superconducting cable system according to claim 3, characterized in that the expansion joint (230) is flanged with the head (221) and/or the sleeve (222).

5. Superconducting cable system according to claim 2, characterized in that the material of the head (221), the sleeve (222) and the expansion joint (230) is metal.

6. Superconducting electrical cable system according to claim 2, characterized in that the expansion joint (230) is a bent pipe expansion joint.

7. Superconducting cable system according to claim 2, characterized by further comprising a handle (40) arranged at the head (221).

8. Superconducting cable system according to claim 7, characterized in that the handle (40) is a traction ring.

9. Superconducting cable system according to claim 8, characterized in that the traction ring is welded to the head (221).

10. Superconducting cable system according to claim 1, characterized in that the pulling sock (20) is flanged to the cryogenic dewar (10).

11. Superconducting cable system according to claim 1, characterized in that the pulling sock (20) is the same internal diameter as the cryogenic dewar (10).