阅读说明：本技术 一种改进corc圆芯导体的多槽超导缆线 (Multi-slot superconducting cable with improved CORC round core conductor ) 是由 刘忠林 周立平 于 2021-08-25 设计创作，主要内容包括：本发明公开一种改进CORC圆芯导体的多槽超导缆线,包括：骨架,超导带材,覆盖物和保护层；骨架周壁开设有导槽；导槽至少有两组,且关于骨架的中心轴线对称设置；导槽绕骨架周壁呈螺旋状分布；超导带材设置有若干层,堆叠安置在导槽内；覆盖物覆设在超导带材上；骨架外侧还套设有保护层。本发明中超导带材在导槽内堆叠,在增大电缆电流密度的同时,也增强了电缆承受机械应力或电磁力的能力,同时尽可能减少超导材料在导槽内发生扭转进而使临界性能发生衰退,增强了电缆的稳定性。(The invention discloses a multi-slot superconducting cable for improving a CORC round core conductor, which comprises: a former, a superconducting tape, a covering and a protective layer; the peripheral wall of the framework is provided with a guide groove; at least two groups of guide grooves are arranged and are symmetrically arranged about the central axis of the framework; the guide grooves are spirally distributed around the peripheral wall of the framework; the superconducting tapes are provided with a plurality of layers and are stacked in the guide grooves; the covering is covered on the superconducting tape; the outer side of the framework is also sleeved with a protective layer. According to the invention, the superconducting strips are stacked in the guide groove, so that the current density of the cable is increased, the capability of the cable for bearing mechanical stress or electromagnetic force is enhanced, the phenomenon that the superconducting material is twisted in the guide groove to further cause the decline of critical performance is reduced as much as possible, and the stability of the cable is enhanced.)

1. A multi-slot superconducting cable for improving a CORC round core conductor is characterized by comprising: a framework (1), a superconducting tape (2), a covering (3) and a protective layer; the peripheral wall of the framework (1) is provided with a guide groove; the guide grooves are at least two groups and are symmetrically arranged about the central axis of the framework (1); the guide grooves are spirally distributed around the peripheral wall of the framework (1);

the superconducting tape (2) is provided with a plurality of layers which are stacked and arranged in the guide groove; the covering (3) is covered on the superconducting tape (2); the protective layer is further sleeved on the outer side of the framework (1).

2. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 1, wherein: a cooling channel (7) is formed in the center of the framework (1); the framework (1) comprises but is not limited to a copper pipe or a stainless steel pipe.

3. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 1, wherein:

the inclination angles of the guide grooves of a plurality of groups on each cross section of the framework (1) are the same and are of circular arc structures;

the guide grooves are spirally distributed around the axial direction of the framework (1) in a unidirectional way; the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tape (2) is wound in the guide groove;

or the guide grooves are distributed in a bidirectional spiral manner around the axial direction of the framework (1); the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tapes (2) are stacked in the guide groove in a bidirectional staggered manner.

4. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 1, wherein: the superconducting tape (2) is a ReBCO superconducting tape.

5. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 1, wherein: the covering (3) comprises, but is not limited to, aluminum metal, copper metal or stainless steel metal for fixing the superconducting tape (2).

6. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 1, wherein: the protective layer sequentially comprises an insulating layer (4), a shielding layer (5) and a shell (6) from inside to outside.

7. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 6, wherein: the insulating layer (4) is formed by winding insulating paper.

8. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 6, wherein: the shielding layer (5) is wound outside the insulating layer (4), and one end or two ends of the shielding layer (5) are grounded and used for shielding an external electromagnetic field of the superconducting tape (2).

9. The multi-slot superconducting cable for improving the CORC round core conductor as claimed in claim 6, wherein: the shell (6) is arranged outside the shielding layer (5) and is made of metal materials including but not limited to copper or aluminum.

Technical Field

The invention relates to the technical field of high-temperature superconductivity, in particular to a multi-slot superconducting cable with an improved CORC round core conductor.

Background

With the increasing demand of national people for electric energy, the transmission capacity and transmission density of a power grid are gradually increased, and long-distance and large-capacity transmission cables are continuously increased to meet the demand of electric energy. Meanwhile, the transmission cable not only occupies a large space, but also has certain electromagnetic pollution to the surrounding environment. Compared with the conventional cable, the high-temperature superconducting cable has the advantages of strong current carrying capacity, small transmission loss, compact structure, no fire hazard, environmental friendliness and the like, and is one of important technologies for large-capacity long-distance power transmission in the future.

At present, high-temperature superconducting cables adopted at home and abroad mainly improve the current density of the cables by stacking and twisting superconducting tapes and mainly comprise round core type conductor cables (CORCs), Roebel coated conductor cables (RACCs) and Twisted Stacked Tape Cables (TSTCs), wherein the CORC conductor is relatively simple in manufacturing process and good in electrical stability, so that the application of the high-temperature superconducting cables is most likely to be realized.

The CORC cable is formed by spirally winding a high-temperature superconducting coated conductor on a metal tube in multiple layers, so that the CORC cable has a compact structure and high current density. However, due to the influence of external factors, the cable is inevitably impacted by mechanical stress or electromagnetic force, and the high-temperature superconducting coating conductors on different layers are displaced or even damaged under the action of force, so that the critical current performance of the high-temperature superconducting coating conductors is influenced, and the current density of the superconducting cable is reduced.

Disclosure of Invention

The invention aims to provide a multi-groove superconducting cable with an improved CORC round core conductor, which solves the problems in the prior art, can solve the problem of poor mechanical force stability of the conventional cable, and enhances the stability of the cable while improving the current density.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a multi-slot superconducting cable for improving a CORC round core conductor, which comprises: a former, a superconducting tape, a covering and a protective layer; the peripheral wall of the framework is provided with a guide groove; the guide grooves are at least two groups and are symmetrically arranged about the central axis of the framework; the guide grooves are spirally distributed around the peripheral wall of the framework;

the superconducting tapes are provided with a plurality of layers and are stacked in the guide grooves; the covering is covered on the superconducting tape; the framework outside is also sleeved with a protective layer.

A cooling channel is formed in the center of the framework; the skeleton includes, but is not limited to, copper or stainless steel tubes.

The inclined angles of the guide grooves in the plurality of groups on each cross section of the framework are the same and are of circular arc structures;

the guide grooves are spirally distributed around the axial direction of the framework in a one-way manner; the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tape is wound in the guide groove;

or the guide grooves are distributed in a bidirectional spiral manner around the axial direction of the framework; the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tapes are stacked in the guide groove in a bidirectional staggered manner.

The superconducting tape is a ReBCO superconducting tape.

The cover includes, but is not limited to, aluminum metal, copper metal, or stainless steel metal for fixing the superconducting tape.

The protective layer sequentially comprises an insulating layer, a shielding layer and a shell from inside to outside.

The insulating layer is formed by winding insulating paper.

The shielding layer is wound outside the insulating layer, and one end or two ends of the shielding layer are grounded and used for shielding the external electromagnetic field of the superconducting tape.

The housing is disposed outside the shielding layer and is made of a metal material including, but not limited to, copper or aluminum.

The invention discloses the following technical effects: according to the invention, the superconducting strips are stacked in the guide groove, so that the current density of the cable is increased, the capability of the cable for bearing mechanical stress or electromagnetic force is enhanced, the phenomenon that the superconducting material is twisted in the guide groove to further cause the decline of critical performance is reduced as much as possible, and the stability of the cable is enhanced.

Drawings

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

FIG. 1 is a schematic view of a main structure of a unidirectional multi-slot superconducting cable according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a unidirectional multi-slot superconducting cable according to an embodiment of the present invention;

FIG. 3 is a schematic view of a metal skeleton structure of a unidirectional multi-slot superconducting cable according to an embodiment of the present invention;

FIG. 4 is a schematic view of the main structure of a bidirectional multi-slot superconducting cable according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a bidirectional multi-slot superconducting cable according to an embodiment of the present invention;

FIG. 6 is a schematic view of a metal skeleton structure of a bidirectional multi-slot superconducting cable according to an embodiment of the present invention;

fig. 7 is a schematic view of a conventional superconducting cable structure.

Wherein, 1-metal framework, 2-superconducting strip, 3-metal covering, 4-insulating layer, 5-shielding layer, 6-shell and 7-cooling channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The invention provides a multi-slot superconducting cable for improving a CORC round core conductor, which comprises: a framework 1, a superconducting tape 2, a covering 3 and a protective layer; the peripheral wall of the framework 1 is provided with a guide groove; at least two groups of guide grooves are arranged and are symmetrically arranged about the central axis of the framework 1; the guide grooves are spirally distributed around the peripheral wall of the framework 1;

the superconducting tape 2 is provided with a plurality of layers and is stacked in the guide groove; the covering 3 is covered on the superconducting tape 2; the outer side of the framework 1 is also sleeved with a protective layer.

A cooling channel 7 is arranged in the center of the framework 1; the carcass 1 includes, but is not limited to, copper or stainless steel tubes.

Further, a cooling channel 7 is provided for cooling the superconducting conductor.

The inclined angles of the plurality of groups of guide grooves on each cross section of the framework 1 are the same and are of circular arc structures;

the guide grooves are spirally distributed around the axial direction of the framework 1 in a unidirectional way; the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tape 2 is wound in the guide groove;

or the guide grooves are spirally distributed in two directions around the axial direction of the framework 1; the cross section of the guide groove is arc-shaped and is symmetrically distributed; the superconducting tapes 2 are stacked one on another in the guide grooves in a bidirectional staggered manner.

The superconducting tape 2 is a ReBCO superconducting tape.

The cover 3 includes, but is not limited to, aluminum metal, copper metal, or stainless steel metal for fixing the superconducting tape 2.

The protective layer comprises an insulating layer 4, a shielding layer 5 and a shell 6 from inside to outside in sequence.

The insulating layer 4 is formed by winding insulating paper.

Furthermore, the insulating layers are formed by winding insulating paper with good insulating property and good mechanical property at low temperature.

The shielding layer 5 is wound outside the insulating layer 4, and one end or two ends of the shielding layer 5 are grounded and used for shielding the external electromagnetic field of the superconducting tape 2.

The housing 6 is disposed outside the shielding layer 5 and is made of a metal material including, but not limited to, copper or aluminum.

Further, the inner shape of the housing 6 is cylindrical to fit the frame 1, and the outer shape of the housing 6 includes, but is not limited to, circular, square, and the like.

In an embodiment of the present invention, the superconducting tapes 2 are ReBCO superconducting tapes, and the superconductor is formed by stacking multiple layers of ReBCO superconducting tapes in each guiding groove, and the current density of the cable can be increased by stacking multiple layers of the ReBCO superconducting tapes 2.

As shown in fig. 7, the conventional cable includes a common framework, a first layer of three superconducting tapes sequentially wound on the framework, and a second layer of three superconducting tapes wound on the framework in a reverse order; the axial included angle of the first layer and the second layer does not exceed 90 degrees.

A first layer of superconducting strip and a second layer of superconducting strip of a conventional CORC cable are independently wound, the first layer is wound, then the second layer is wound, and the problem of difference of inductance parameters exists between layers.

In an embodiment of the present invention, as shown in fig. 1-3, taking a three-slot superconducting cable as an example, the guide grooves are spirally distributed in a unidirectional manner around the axial direction of the framework 1, and the cross sections of the guide grooves are arc-shaped and symmetrically distributed; the guide grooves are symmetrical about the center of the framework 1; at least two groups of superconducting tapes 2 are stacked in each guide groove 1, so that the current density of the cable is increased, the capability of the cable for bearing mechanical stress or electromagnetic force is enhanced, and the phenomenon that the superconducting materials are twisted in the guide grooves to further cause the decline of critical performance is reduced as much as possible.

In another embodiment of the present invention, as shown in fig. 4-6, taking a three-slot superconducting cable as an example, the guiding grooves are distributed spirally in two directions around the axial direction of the frame 1, the cross section of the guiding grooves is arc-shaped and symmetrically distributed, the guiding grooves are provided with 3 groups, each group of guiding grooves comprises two guiding grooves in two spiral directions, each group of guiding grooves comprises 3 groups of guiding grooves in two spiral directions, and each group of guiding grooves is a same double-spiral guiding groove, so that an infinite number of junctions are formed on the peripheral wall of the frame 1.

Furthermore, the superconducting tapes 2 are stacked in the guide groove, so that the current density of the cable is increased, the capability of the cable for bearing mechanical stress or electromagnetic force is enhanced, and the phenomenon that the superconducting materials are twisted in the guide groove to further cause the decline of critical performance is reduced as much as possible.

In the present embodiment, the number of layers of the superconducting tape 2 is at least two; when the superconducting tapes 2 are wound on the framework 1, one guide groove is selected as an initial guide groove, and 6 superconducting tapes 2 are sequentially wound on the framework 1 clockwise or anticlockwise, so that a first layer is wound; similarly, the initial guide groove is selected, 6 superconducting tapes 2 are wound on the framework 1 in sequence according to the sequence opposite to that of the first layer of superconducting tapes 2, and the second layer of superconducting tapes is wound.

Further, when the winding of the superconducting tapes 2 of the two layers is completed, the superconducting tapes 2 stacked above the first layer and the second layer are wound; the superconducting tapes 2 between every two adjacent odd-even layers are wound in a forward and reverse staggered manner.

Furthermore, a plurality of rows of limiting blocks are formed on the peripheral wall of the framework 1, and adjacent rows of limiting blocks are arranged in a vertically staggered manner; the limiting block is of a tetrahedron structure, and the four sides of the limiting block are all arc-shaped and are matched with the guide grooves in shape.

In another embodiment of the invention, after the multilayer strips are stacked, one direction is selected for winding, and the other direction is selected for winding in the opposite direction, so that the winding difficulty is greatly reduced.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.