阅读说明：本技术 超导输电电缆及超导输电电缆系统 (Superconducting power transmission cable and superconducting power transmission cable system ) 是由 张会明 张宏杰 诸嘉慧 陈盼盼 陈杰 曹京荥 丘明 于 2019-09-17 设计创作，主要内容包括：本发明提供了一种超导输电电缆及超导输电电缆系统。超导输电电缆包括：壳体、三相交流超导电缆和直流超导电缆；其中,壳体的内部填充有具有预设绝缘等级的第一绝缘层,三相交流超导电缆和直流超导电缆均插设于第一绝缘层内；三相交流超导电缆的引出线伸出至壳体的外部以与交流用电设备相连接；直流超导电缆的引出线伸出至壳体的外部以与直流用电设备相连接。本发明能够同时输送交流电和直流电,实现了简洁、高效地交直流供电,并且,避免了交直流的转换,进而避免了电能的损耗,提高了电能的输送效率和空间利用效率,还能保证超导电缆的性质,结构简单,便于实施。(The invention provides a superconducting power transmission cable and a superconducting power transmission cable system. A superconducting power transmission cable includes: the superconducting cable comprises a shell, a three-phase alternating current superconducting cable and a direct current superconducting cable; the three-phase alternating current superconducting cable and the direct current superconducting cable are inserted into the first insulating layer; the outgoing line of the three-phase alternating current superconducting cable extends out of the shell to be connected with alternating current electric equipment; the lead-out wire of the direct current superconducting cable is extended to the outside of the case to be connected with the direct current electric equipment. The superconducting cable can simultaneously transmit alternating current and direct current, realizes simple and efficient alternating current and direct current power supply, avoids the conversion of alternating current and direct current, further avoids the loss of electric energy, improves the transmission efficiency and the space utilization efficiency of the electric energy, can also ensure the property of the superconducting cable, and has simple structure and convenient implementation.)

1. A superconducting power transmission cable, comprising: the superconducting cable comprises a shell (1), a three-phase alternating current superconducting cable (2) and a direct current superconducting cable; wherein the content of the first and second substances,

the shell (1) is internally filled with a first insulating layer (5) with a preset insulation grade, and the three-phase alternating current superconducting cable (2) and the direct current superconducting cable are inserted into the first insulating layer (5);

the outgoing line of the three-phase alternating current superconducting cable (2) extends out of the shell (1) to be connected with alternating current electric equipment (6); the lead-out wire of the direct current superconducting cable extends out of the shell (1) to be connected with direct current electric equipment (7).

2. A superconducting power transmission cable according to claim 1, wherein the dc superconducting cables are two, respectively a positive dc superconducting cable (3) and a negative dc superconducting cable (4).

3. A superconducting power transmission cable according to claim 1, wherein there are three dc superconducting cables, being a positive dc superconducting cable, a negative dc superconducting cable and a zero-pole dc superconducting cable.

4. A superconducting power transmission cable according to claim 2, wherein the three-phase ac superconducting cable (2) and the dc superconducting cable are arranged at intervals within the first insulating layer (5).

5. The superconducting power transmission cable of claim 2,

the three-phase alternating current superconducting cable (2) and the direct current superconducting cable are coaxially arranged with the shell (1) and are sequentially connected in a sleeved mode;

the three-phase AC superconducting cable (2) is disposed at a central position of the case (1) compared to the DC superconducting cable.

6. The superconducting power transmission cable of claim 5,

the three-phase AC superconducting cable (2) includes: the superconducting cable comprises a first framework (21), and a first superconducting layer (22), a second superconducting layer (23), a third superconducting layer (24), a first shielding layer (25) and a second insulating layer (26) which are sequentially wound on the outer portion of the first framework (21); the first framework (21) is coaxially arranged with the shell (1) and is arranged at the central position of the shell (1); the interior of the first framework (21) is used for introducing cooling liquid; a preset gap is reserved between the first shielding layer (25) and the second insulating layer (26) to output the cooling liquid;

each of the direct current superconducting cables includes: the second framework (12), and a fourth superconducting layer (13), a second shielding layer (14) and a third insulating layer (15) which are sequentially wound outside the second framework (12);

a second framework (12) arranged in the middle direct current superconducting cable is sleeved outside the second insulating layer (26) and a preset gap is reserved between the second framework and the second insulating layer (26) so as to introduce cooling liquid; a second framework (12) in the direct current superconducting cable arranged on the outer side is sleeved outside a third insulating layer (15) in the direct current superconducting cable arranged in the middle, and a preset gap is formed between the second framework and the third insulating layer (15) so as to allow cooling liquid to enter; the second shielding layer (14) and the third insulating layer (15) in each of the DC superconducting cables have a predetermined gap therebetween to output the cooling liquid.

7. Superconducting power transmission cable according to claim 5 or 6,

the direct current superconducting cable arranged in the middle is a positive direct current superconducting cable (3), and the direct current superconducting cable arranged on the outer side is a negative direct current superconducting cable (4); alternatively, the first and second electrodes may be,

the direct current superconducting cable arranged in the middle is a cathode direct current superconducting cable (4), and the direct current superconducting cable arranged on the outer side is an anode direct current superconducting cable (3).

8. The superconducting power transmission cable of claim 2,

the direct current superconducting cable and the three-phase alternating current superconducting cable (2) are coaxially arranged with the shell (1) and are sequentially connected in a sleeved mode;

one of the direct current superconducting cables is disposed at a central position of the case (1) compared to the three-phase alternating current superconducting cables (2).

9. The superconducting power transmission cable of claim 8,

each of the direct current superconducting cables includes: the second framework (12), and a fourth superconducting layer (13), a second shielding layer (14) and a third insulating layer (15) which are sequentially wound outside the second framework (12);

a second framework (12) arranged in the direct current superconducting cable at the inner side is coaxially arranged with the shell (1) and is arranged at the central position of the shell (1), and the second framework (12) is used for introducing cooling liquid;

a second framework (12) arranged in the middle direct current superconducting cable is sleeved outside a third insulating layer (15) arranged in the inner direct current superconducting cable, and a preset gap is formed between the second framework and the third insulating layer (15) so as to introduce cooling liquid; a preset gap is reserved between the second shielding layer (14) and the third insulating layer (14) in each direct current superconducting cable so as to output the cooling liquid;

the three-phase AC superconducting cable (2) includes: the superconducting cable comprises a first framework (21), and a first superconducting layer (22), a second superconducting layer (23), a third superconducting layer (24), a first shielding layer (25) and a second insulating layer (26) which are sequentially wound on the outer portion of the first framework (21); the first framework (21) is sleeved outside a third insulating layer (15) in the middle direct current superconducting cable, and a preset gap is formed between the first framework and the third insulating layer (15) so as to introduce cooling liquid; the first shielding layer (25) and the second insulating layer (26) have a preset gap therebetween to output the cooling liquid.

10. Superconducting power transmission cable according to claim 8 or 9,

the direct current superconducting cable arranged at the center of the shell (1) is a positive electrode direct current superconducting cable (3), and the direct current superconducting cable arranged in the middle is a negative electrode direct current superconducting cable (4); alternatively, the first and second electrodes may be,

the direct current superconducting cable arranged in the center of the shell (1) is a cathode direct current superconducting cable (4), and the direct current superconducting cable arranged in the middle is an anode direct current superconducting cable (3).

11. The superconducting power transmission cable of claim 1,

the insulation grade of the three-phase alternating current superconducting cable (2) comprises: 10kV, 35kV, 66kV, 110kV, 220kV, 330kV and 500 kV;

the insulation grade of the direct current superconducting cable includes: +/-10 kV and +/-20 kV; +/-100 kV; +/-160 kV; plus or minus 200 kV; +/-250 kV; 400 kV.

12. A superconducting electrical transmission cable system, comprising: -a cooling system (11) and a superconducting transmission cable according to any one of claims 1 to 11; wherein the content of the first and second substances,

the cooling system (11) is connected with the superconducting power transmission cable and used for conveying cooling liquid into the superconducting power transmission cable so as to cool the three-phase alternating current superconducting cable (2) and the direct current superconducting cable in the superconducting power transmission cable.

Technical Field

The invention relates to the technical field of cables, in particular to a superconducting power transmission cable and a superconducting power transmission cable system.

Background

With the rapid development of power electronic technology, direct current power distribution and related equipment are more used in power distribution networks and electrified vehicles such as ships and airplanes. The direct current distribution can reduce the alternating current-direct current conversion process of equipment, reduce the network loss of electric energy in the conversion, and increase the efficiency of electric energy use. However, in the current power distribution range, especially in public power distribution networks, simple, economical and flexible ac power distribution technology is still the mainstream business model, and therefore, the development of ac/dc hybrid power distribution networks is the current development direction.

With the increase of urban power demand and the improvement of power grid operation safety requirement and environmental protection requirement, higher requirements of vehicles such as 'electrified' ships and airplanes on propulsion efficiency and vibration noise cannot be completely met by a traditional local power network, the development of a high-temperature superconducting cable provides possibility for solving the problems, and the superconducting cable can be applied to places which cannot adopt conventional cables due to space and safety factors so as to meet load requirements. Compared with the traditional cable, the superconducting cable has the technical advantages of low loss, large capacity, compact structure, environmental friendliness, optimization of a power grid structure and the like. The superconducting cable has zero resistance characteristic when running under critical current, and even considering hysteresis, eddy current loss and electric energy consumption of a refrigeration system, the loss of the superconducting cable is reduced by 20-70% compared with the conventional cable; by utilizing the high-density unobstructed current carrying capacity of the superconducting material, the power transmission capacity of the superconducting cable under the same voltage level can be improved by more than 3-5 times compared with that of a conventional cable, and the power transmission voltage level can be greatly reduced under the condition of certain transmission capacity; under the same voltage class, the demand of transmission corridor can reduce 1/3 ~ 1/2, saves space and satisfies the needs that new forms of energy inserted and load increase.

However, existing forms of superconducting cables include: a direct current superconducting cable and an alternating current superconducting cable. The direct current superconducting cable and the alternating current superconducting cable are used for independently supplying direct current and alternating current, and cannot simultaneously output alternating current and direct current.

Disclosure of Invention

In view of this, the present invention provides a superconducting power transmission cable, which aims to solve the problem that a superconducting cable cannot output ac and dc simultaneously in the prior art. The invention also provides a superconducting power transmission cable system with the superconducting power transmission cable.

In one aspect, the present invention provides a superconducting power transmission cable, comprising: the superconducting cable comprises a shell, a three-phase alternating current superconducting cable and a direct current superconducting cable; the three-phase alternating current superconducting cable and the direct current superconducting cable are inserted into the first insulating layer; the outgoing line of the three-phase alternating current superconducting cable extends out of the shell to be connected with alternating current electric equipment; the lead-out wire of the direct current superconducting cable is extended to the outside of the case to be connected with the direct current electric equipment.

Furthermore, in the above superconducting power transmission cable, there are two dc superconducting cables, which are a positive dc superconducting cable and a negative dc superconducting cable, respectively.

Further, in the above superconducting power transmission cable, three direct current superconducting cables are provided, which are a positive direct current superconducting cable, a negative direct current superconducting cable, and a zero-pole direct current superconducting cable.

Further, in the above superconducting power transmission cable, the three-phase ac superconducting cable and the dc superconducting cable are provided at an interval in the first insulating layer.

Furthermore, in the above superconducting power transmission cable, both the three-phase ac superconducting cable and the dc superconducting cable are coaxially disposed with the housing and sequentially connected in a sleeved manner; the three-phase ac superconducting cable is placed at a central position of the case, compared to the dc superconducting cable.

Further, in the superconducting power transmission cable, the three-phase ac superconducting cable includes: the first superconducting layer, the second superconducting layer, the third superconducting layer, the first shielding layer and the second insulating layer are sequentially wound outside the first framework; the first framework is coaxially arranged with the shell and is arranged at the center of the shell; the interior of the first framework is used for introducing cooling liquid; a preset gap is formed between the first shielding layer and the second insulating layer so as to output cooling liquid; each of the direct current superconducting cables includes: the fourth superconducting layer, the second shielding layer and the third insulating layer are sequentially wound outside the second framework; a second framework arranged in the middle direct current superconducting cable is sleeved outside the second insulating layer, and a preset gap is formed between the second framework and the second insulating layer so as to introduce cooling liquid; the second framework in the DC superconducting cable arranged at the outer side is sleeved outside the third insulating layer in the DC superconducting cable arranged in the middle, and a preset gap is reserved between the second framework and the third insulating layer so as to introduce cooling liquid; the second shielding layer and the third insulating layer in each of the dc superconducting cables have a predetermined gap therebetween to output the cooling liquid.

Furthermore, in the above superconducting power transmission cable, the dc superconducting cable disposed in the middle is a positive dc superconducting cable, and the dc superconducting cable disposed outside is a negative dc superconducting cable; or, the direct current superconducting cable arranged in the middle is a negative direct current superconducting cable, and the direct current superconducting cable arranged on the outer side is a positive direct current superconducting cable.

Further, in the above superconducting power transmission cable, both the direct current superconducting cable and the three-phase alternating current superconducting cable are coaxially arranged with the housing and sequentially connected in a sleeved manner; one of the direct current superconducting cables is disposed at a central position of the case, compared to the three-phase alternating current superconducting cable.

Further, in the above superconducting power transmission cable, each of the dc superconducting cables includes: the fourth superconducting layer, the second shielding layer and the third insulating layer are sequentially wound outside the second framework; a second framework arranged in the direct current superconducting cable at the inner side is coaxially arranged with the shell and is arranged at the central position of the shell, and the second framework is used for introducing cooling liquid; the second framework arranged in the middle direct current superconducting cable is sleeved outside a third insulating layer in the inner direct current superconducting cable, and a preset gap is formed between the second framework and the third insulating layer so as to introduce cooling liquid; a preset gap is reserved between the second shielding layer and the third insulating layer in each direct current superconducting cable so as to output cooling liquid; a three-phase AC superconducting cable includes: the first superconducting layer, the second superconducting layer, the third superconducting layer, the first shielding layer and the second insulating layer are sequentially wound outside the first framework; the first framework is sleeved outside a third insulating layer in the middle direct current superconducting cable, and a preset gap is formed between the first framework and the third insulating layer so as to introduce cooling liquid; a preset gap is formed between the first shielding layer and the second insulating layer so as to output the cooling liquid.

Further, in the above superconducting power transmission cable, the dc superconducting cable disposed at the center of the housing is a positive dc superconducting cable, and the dc superconducting cable disposed in the middle is a negative dc superconducting cable; or, the direct current superconducting cable arranged at the center of the shell is a cathode direct current superconducting cable, and the direct current superconducting cable arranged in the middle is an anode direct current superconducting cable.

Further, in the superconducting power transmission cable, the insulation grade of the three-phase ac superconducting cable includes: 10kV, 35kV, 66kV, 110kV, 220kV, 330kV and 500 kV; the insulation grade of the direct current superconducting cable includes: +/-10 kV and +/-20 kV; +/-100 kV; +/-160 kV; plus or minus 200 kV; +/-250 kV; 400 kV.

According to the invention, the three-phase alternating current superconducting cable and the direct current superconducting cable are arranged in the shell, so that alternating current and direct current can be simultaneously transmitted, the simple and efficient alternating current and direct current power supply is realized, the conversion of alternating current and direct current is avoided, the loss of electric energy is further avoided, the transmission efficiency and the space utilization efficiency of the electric energy are improved, the problem that the superconducting cable cannot simultaneously output alternating current and direct current in the prior art is solved, the property of the superconducting cable can be ensured, the structure is simple, and the implementation is convenient.

In another aspect, the present invention further provides a superconducting power transmission cable system, including: a cooling system and any one of the above superconducting power transmission cables; the cooling system is connected with the superconducting power transmission cable and used for conveying cooling liquid into the superconducting power transmission cable so as to cool the three-phase alternating current superconducting cable and the direct current superconducting cable in the superconducting power transmission cable.

It can be seen that, in this embodiment, the superconducting power transmission cable can simultaneously transmit alternating current and direct current, so that compact and efficient alternating current/direct current power supply is realized, the transmission efficiency and the space utilization efficiency of electric energy are improved, and the three-phase alternating current superconducting cable and the direct current superconducting cable in the superconducting power transmission cable share the same cooling system, thereby reducing electromagnetic pollution and improving the cable cooling and electric energy transmission efficiency.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural view of a superconducting power transmission cable according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a superconducting power transmission cable according to an embodiment of the present invention;

FIG. 3 is a schematic view of another configuration of a superconducting power transmission cable according to an embodiment of the present invention;

FIG. 4 is a schematic view of another configuration of a superconducting power transmission cable according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a superconducting power transmission cable system according to an embodiment of the present invention;

fig. 6 is a schematic view of a cooling system in a superconducting power transmission cable system according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Superconducting transmission cable embodiments:

referring to fig. 1 to 4, there are shown preferred structures of the superconducting power transmission cable in the present embodiment. As shown, the superconducting power transmission cable includes: the superconducting cable comprises a shell 1, a three-phase alternating current superconducting cable 2 and a direct current superconducting cable. The housing 1 is hollow, and the housing 1 is filled with a first insulating layer 5, and the first insulating layer 5 is made of an insulating material. The first insulating layer 5 has a preset insulating level, which can be determined according to actual conditions, and the embodiment does not limit this. Thus, the first insulating layer 5 can have various insulation grades, so that the superconducting power transmission cable can be suitable for any different insulation grades, the application range is expanded, and the insulating property is improved.

Both the three-phase ac superconducting cable 2 and the dc superconducting cable are disposed in the casing 1, and both the three-phase ac superconducting cable 2 and the dc superconducting cable are inserted into the first insulating layer 5, and specifically, the three-phase ac superconducting cable 2 and the dc superconducting cable are suspended in the casing 1, and in order to stably place the three-phase ac superconducting cable 2 and the dc superconducting cable in the casing 1, an insulating material is filled between the inner wall of the casing 1 and both the three-phase ac superconducting cable 2 and the dc superconducting cable, thereby forming the first insulating layer 5.

Preferably, the insulation grade of the three-phase ac superconducting cable 2 includes: 10kV, 35kV, 66kV, 110kV, 220kV, 330kV, 500kV and the like. The insulation grade of the direct current superconducting cable includes: +/-10 kV and +/-20 kV; +/-100 kV; +/-160 kV; plus or minus 200 kV; +/-250 kV; 400kV, etc.

The lead wire of the three-phase ac superconducting cable 2 is extended to the outside of the case 1, and is used for connecting with the ac electric equipment 6 to supply ac power to the ac electric equipment 6.