CN214279671U

CN214279671U - Superconducting cable

Info

Publication number: CN214279671U
Application number: CN202120609237.5U
Authority: CN
Inventors: 寿皓; 陈宁; 韦小兰
Original assignee: ZHUHAI HANSEN TECHNOLOGY CO LTD
Current assignee: ZHUHAI HANSEN TECHNOLOGY CO LTD
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-09-24
Anticipated expiration: 2031-03-25

Abstract

The application discloses a superconducting cable, including: a superconducting conductor, an insulating layer and an outer conductor; the superconducting conductor comprises a metal matrix and a plurality of first metal wires arranged in the metal matrix; the insulating layer is coated on the periphery of the superconducting conductor; the outer conductor is coated on the periphery of the insulating layer and used for protecting the insulating layer and the superconducting conductor. The insulating layer and the outer conductor are sequentially arranged on the periphery of the superconducting conductor, so that the superconducting conductor can be protected, and the durability of the superconducting cable is improved; meanwhile, the first metal wire is arranged in the metal matrix, when transient disturbance occurs in a superconducting state due to temperature rise at local positions, the transport current can be moved into the metal matrix, so that thermal quench is prevented or a current bypass is provided, loss is reduced, and stability is improved. The stability and durability of the existing superconducting cable need to be further improved.

Description

Superconducting cable

Technical Field

The application relates to the technical field of cable communication, in particular to a superconducting cable.

Background

When the superconducting cable is cooled to below critical temperature and enters a superconducting state, the direct current resistance is zero, the low-temperature superconducting characteristic of the superconducting cable needs to be refrigerated by expensive liquid helium (with a boiling point of 4.2K), and the superconducting cable is mainly applied to the fields of medical nuclear magnetic resonance, large scientific device superconducting magnets and the like at present; compared with the conventional cable, the superconducting cable has the advantages of large capacity, low loss and the like; meanwhile, the superconducting cable can transmit extra power, and the critical length of the superconducting cable can reach hundreds of miles. The system applying the superconducting cable can endure the short-circuit current of users in a short time, and does not need to be switched off, so that other normal load currents are cut off, and the system has the advantages of long overload allowable period and the like.

With the development of the technology, the application of the superconducting cable is more and more extensive, and higher requirements are further put forward on the stability and the durability of the superconducting cable.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present application is to provide a superconducting cable for solving the problem of insufficient stability and durability of the conventional superconducting cable.

To achieve the above technical object, the present application provides a superconducting cable comprising: a superconducting conductor, an insulating layer and an outer conductor;

the superconducting conductor comprises a metal matrix and a plurality of first metal wires arranged in the metal matrix;

the insulating layer is coated on the periphery of the superconducting conductor;

the outer conductor is coated on the periphery of the insulating layer and used for protecting the insulating layer and the superconducting conductor.

Preferably, the outer conductor includes a braid and a protective layer;

the braided layer is coated outside the insulating layer and is formed by weaving a second metal wire;

the protective layer is coated outside the braided layer.

Preferably, the protective layer is in particular a tin layer.

Preferably, the second metal wire is a tinned copper wire or a silvered copper wire.

Preferably, the first metal wire is specifically a niobium-titanium alloy wire.

Preferably, the metal substrate is in particular an oxygen-free copper substrate.

Preferably, the insulating layer is made in particular of polytetrafluoroethylene.

Preferably, the volume ratio of the metal matrix to the first metal wire is 15% to 50%.

Preferably, the insulating layer is of a solid structure or a foamed structure.

Preferably, a plurality of the first metal wires are uniformly distributed in the metal matrix in a circumferential manner.

As can be seen from the above technical solutions, the present application provides a superconducting cable including: a superconducting conductor, an insulating layer and an outer conductor; the superconducting conductor comprises a metal matrix and a plurality of first metal wires arranged in the metal matrix; the insulating layer is coated on the periphery of the superconducting conductor; the outer conductor is coated on the periphery of the insulating layer and used for protecting the insulating layer and the superconducting conductor. The insulating layer and the outer conductor are sequentially arranged on the periphery of the superconducting conductor, so that the superconducting conductor can be protected, and the durability of the superconducting cable is improved; meanwhile, the first metal wire is arranged in the metal matrix, when transient disturbance occurs in a superconducting state due to temperature rise at local positions, the transport current can be moved into the metal matrix, so that thermal quench is prevented or a current bypass is provided, loss is reduced, and stability is improved. The stability and durability of the conventional superconducting cable are further improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic view of an overall structure of a superconducting cable according to an embodiment of the present application;

fig. 2 is a schematic view of a superconducting conductor of a superconducting cable according to an embodiment of the present application;

in the figure: 1. a superconducting conductor; 2. an insulating layer; 3. an outer conductor; 11. a first wire; 12. a metal substrate; 31. a protective layer; 32. and (4) weaving the layer.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection claimed herein.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The embodiment of the application discloses a superconducting cable.

Referring to fig. 1 and 2, an embodiment of the present application provides a superconducting cable, including: a superconducting conductor 1, an insulating layer 2, and an outer conductor 3; the superconducting conductor 1 includes a metal base 12 and a plurality of first wires 11 disposed in the metal base 12; the insulating layer 2 is coated on the periphery of the superconducting conductor 1; the outer conductor 3 is wrapped around the insulating layer 2 to protect the insulating layer 2 and the superconducting conductor 1.

Specifically, when the first metal wire 11 is in contact with the metal matrix 12 and transient disturbance occurs in the superconducting state due to temperature rise in a local place, the transport current can be moved into the metal matrix 12, so that thermal quench is prevented or a current bypass is provided, loss is reduced, and stability is improved.

The above is the first embodiment provided in the present application, and the following is the second embodiment provided in the present application, specifically referring to fig. 1 and fig. 2.

A superconducting cable comprising: a superconducting conductor 1, an insulating layer 2, and an outer conductor 3; the superconducting conductor 1 includes a metal base 12 and a plurality of first wires 11 disposed in the metal base 12; the insulating layer 2 is coated on the periphery of the superconducting conductor 1; the outer conductor 3 is wrapped around the insulating layer 2 to protect the insulating layer 2 and the superconducting conductor 1.

Further, the outer conductor 3 includes a braid 32 and a protective layer 31; the braided layer 32 is coated outside the insulating layer 2 and is formed by braiding second metal wires; the protective layer 31 covers the braided layer 32.

Specifically, the outer conductor 3 can improve flexibility and durability by providing the braid 32 so as to integrally form a semi-flexible structure having a certain flexibility.

Further, in the present embodiment, the protective layer 31 is specifically a tin layer.

Specifically, the tin layer may be obtained by an immersion tin treatment. The braided cable core is wholly dipped with tin, so that the shielding effect of electric conduction and electromagnetic interference resistance is achieved.

Further, in this embodiment, the second metal wire is specifically a tinned copper wire or a silvered copper wire.

Specifically, the tinned copper wire or the silvered copper wire has the characteristics of high temperature resistance, corrosion resistance, high adhesiveness and good chemical resistance. The weaving density of the second metal wire is not less than 95%, and the second metal wire is matched with the protective layer obtained by tin dipping of the outer layer to form the outer conductor with a semi-flexible structure, so that the outer conductor has the effects of low loss, corona resistance, high shielding, electromagnetic interference resistance shielding and product mechanical strength improvement.

Further, in the present embodiment, the first wire 11 is specifically a niobium-titanium alloy wire.

The niobium-titanium alloy conductor remains superconducting with zero resistance at pressures up to 261.7GPa, and is a particularly pressure-resistant superconductor.

Further, in the present embodiment, the metal base 12 is specifically an oxygen-free copper base.

The oxygen-free copper matrix has high conductivity and can play a role in dredging current during local current disturbance.

Further, the insulating layer 2 is made of polytetrafluoroethylene in particular. The insulating layer 2 has a solid structure or a foamed structure.

Specifically, the insulating layer 2 is made of a low dielectric constant polytetrafluoroethylene insulating material, and may have a solid core or a foamed structure. The superconducting cable can be brought into a superconducting state when cooled to a critical temperature, and the insulating material is required to maintain good insulating properties at an ultra-low temperature (low temperature of 4.2 k). The polytetrafluoroethylene has excellent heat resistance and chemical resistance, and has low dielectric constant, low dielectric loss and high electric strength resistance. The superconducting cable made of polytetrafluoroethylene insulation can greatly improve the working temperature and the transmission power capacity of the cable.

It should be noted that the foamed structure makes the insulating layer 2 uniformly and densely distributed with a plurality of tiny pores, reduces the equivalent dielectric constant of insulation, improves the transmission rate of the cable, and makes the cable have the characteristics of ultra-low loss, stable high-frequency communication performance, and the like.

Further, in the present embodiment, the volume ratio of the metal matrix 12 to the first wire 11 is 15% to 50%.

Preferably, in the present embodiment, the volume ratio of the metal matrix 12 to the first wire 11 is 30%.

Further, a plurality of first metal wires 11 are circumferentially and uniformly distributed in the metal matrix 12.

Although the present invention has been described in detail with reference to examples, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.

Claims

1. A superconducting cable, comprising: a superconducting conductor, an insulating layer and an outer conductor;

the superconducting conductor comprises a metal matrix and a plurality of first metal wires;

the first metal wire is arranged in the metal matrix;

the insulating layer is coated on the periphery of the metal matrix;

2. The superconducting cable of claim 1, wherein the outer conductor includes a braid and a protective layer;

the protective layer is coated outside the braided layer.

3. Superconducting cable according to claim 2, characterized in that said protective layer is in particular a tin layer.

4. Superconducting cable according to claim 2, characterized in that the second metal wire is in particular a tinned copper wire or a silvered copper wire.

5. Superconducting cable according to claim 1, characterized in that said first metal wire is in particular a niobium-titanium alloy wire.

6. Superconducting cable according to claim 1, characterized in that said metallic matrix is in particular an oxygen-free copper matrix.

7. Superconducting cable according to claim 1, characterized in that said insulating layer is in particular made of polytetrafluoroethylene.

8. Superconducting cable according to claim 1, characterized in that the volume ratio of the metal matrix to the first metal wires is comprised between 15% and 50%.

9. Superconducting cable according to claim 1, characterized in that said insulating layer is of solid or foamed construction.

10. The superconducting cable of claim 1, wherein a plurality of the first wires are circumferentially equispaced within the metal matrix.