High-current-carrying low-loss stacked conductor high-temperature superconducting cable

Abstract

The utility model discloses a high-current-carrying low-loss stacked conductor high-temperature superconducting cable, and belongs to the technical field of superconducting cables. The specific structure of the high-current-carrying low-loss stacked conductor high-temperature superconducting cable comprises an inner support body; the conductor is wound on the outer surface of the inner support body; the semi-conductive layer wraps the outer side of the conductor; the insulating layer is arranged on the outer side of the semi-conductive layer; the shielding layer is arranged on the outer side of the insulating layer; the first supporting strip layer is arranged on the outer side of the shielding layer; the first steel belt layer is arranged on the outer side of the first supporting strip layer; the second supporting strip layer is arranged on the outer side of the first steel belt layer; the second steel belt layer is arranged on the outer side of the second supporting strip layer; the heat insulation layer is arranged on the outer side of the second steel belt layer; the Dewar layer is arranged on the outer side of the heat insulation layer; and the outer protective layer is arranged on the outer side of the Dewar layer. The utility model solves the technical problems that the conductor of the existing superconducting cable structure is easy to move and the attenuation is large.

Description

TECHNICAL FIELD

[0001] The utility model relates to superconducting cable technical field especially relates to a kind of high current low-loss stacked conductor high-temperature superconducting cable. BACKGROUND

[0002] High-temperature superconducting cable has the characteristics of low loss, small size and large transmission capacity, and has unique advantages in power transmission applications. In recent years, several demonstration projects have been carried out at home and abroad. The city of Essen in Germany first established a three same axis structure high-temperature superconducting cable power transmission demonstration application line and realized grid-connected operation; Shanghai, China successfully connected to the grid and operated a kilometer-level high-temperature superconducting demonstration line, which has been stable for more than two years. Shenzhen, China, also laid and operated a three same axis high-temperature superconducting cable, realizing end-to-end superconducting power transmission in high power load cities. High-temperature superconducting cable transmission can accurately solve the laying conditions of high current, low loss and high space utilization in urban power transmission.

[0003] Due to the limited current-carrying capacity of a single tape, parallel application of multiple tapes can improve current density, so parallel use of multiple tapes has become an inevitable trend in the development of superconducting cable power conductors. Currently, stacked superconducting cable structures are generally used to greatly improve current-carrying capacity, but the form cannot be fixed, is easy to move inside the pipe, and has large attenuation, affecting efficiency. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a kind of high current low-loss stacked conductor high-temperature superconducting cable, solve the technical problems that the conductor of the superconducting cable structure of prior art is easy to move and large attenuation.

[0005] The application embodiment discloses a kind of high current low-loss stacked conductor high-temperature superconducting cable, comprising:

[0006] Inner support body;

[0007] Conductor, is wound in the outer surface of the inner support body;

[0008] Semi-conductive layer, is wrapped outside the conductor;

[0009] Insulating layer, is set to the outside of the semi-conductive layer;

[0010] Shielding layer, is set to the outside of the insulating layer;

[0011] First support strip layer, is set to the outside of the shielding layer;

[0012] First steel belt layer, is set to the outside of the first support strip layer;

[0013] Second support strip layer, is set to the outside of the first steel belt layer;

[0014] A second steel strip layer is arranged outside the second support strip layer;

[0015] A thermal insulation layer is arranged outside the second steel strip layer;

[0016] A Dewar layer is arranged outside the thermal insulation layer;

[0017] An outer protective layer is arranged outside the Dewar layer.

[0018] The present application has a multi-layer structure, which can improve the stability and current-carrying performance of the superconducting cable.

[0019] On the basis of the above technical scheme, the embodiments of the present application can also be improved as follows:

[0020] Further, the inner support body is a copper pipe, and a groove is arranged outside the inner support body, the groove is spiral-shaped, and the conductor is arranged inside the groove.

[0021] Further, the conductor is vertically stacked by a plurality of strip materials, which is convenient for subsequent assembly into the groove.

[0022] Further, the depth of the groove is 0.5mm-0.6mm, and the thickness of the strip material is 0.1mm-0.2mm, which cooperates with the corresponding thickness of the strip material and the groove to complete the assembly.

[0023] Further, the semi-conductive layer is a semi-conductive wrapping tape layer, and the insulating layer is a polypropylene laminated paper winding layer.

[0024] Further, the shielding layer is a flat copper band winding layer, and the first support strip layer and the second support strip layer each include a polypropylene strip.

[0025] Further, a plurality of through holes are arranged on the first steel strip layer and the second steel strip layer.

[0026] Further, the Dewar layer is a double-layer vacuum stainless steel corrugated pipe.

[0027] Further, the thickness of the shielding layer is 0.2mm, the thickness of the insulating layer is 2mm, the thickness of the thermal insulation layer is 3mm, and the thickness of the outer protective layer is 2mm, which can ensure the current-carrying performance of the cable through the corresponding thickness.

[0028] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0029] Compared with the high-temperature superconducting cable of the prior art, the high-temperature superconducting cable of the present application has the advantages that the winding process of the multi-layer conductor is adopted, the winding process is simplified, the strength of the conductor is improved, the attenuation is reduced, and the stability of the structure and the current-carrying performance of the superconducting cable in the long-length processing process is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 A structure diagram of a high-temperature superconducting cable with a high current-carrying and low-loss stacked conductor according to an embodiment of the present application;

[0032] Figure 2 For Figure 1 A structure diagram of an inner support body and a conductor;

[0033] Reference signs:

[0034] 1 - inner support body; 2 - conductor; 3 - semiconductive layer; 4 - insulating layer; 5 - shielding layer; 6 - first support strip layer; 7 - first steel strip layer; 8 - second support strip layer; 9 - second steel strip layer; 10 - heat insulation layer; 11 - Dewar layer; 12 - outer protective layer;

[0035] 101 - groove. EMBODIMENT

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by those skilled in the art to which the present application belongs.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0040] Example:

[0041] like Figures 1-2 As shown in the embodiments, this application discloses a high current-carrying, low-loss stacked conductor high-temperature superconducting cable. Compared with the traditional high-temperature superconducting cable with tape structure conductor, which requires a multi-layer conductor winding process in its production and manufacturing process, this application's new design simplifies the winding process, improves tape strength, reduces attenuation, and ensures the stability of the superconducting cable structure and current-carrying performance under long-length processing.

[0042] like Figure 1 As shown, its specific structure includes:

[0043] The inner support 1 is cylindrical, and preferably is made of copper tubing, wherein the copper tubing has a copper RRR of not less than 100.

[0044] Conductor 2 is wound around the outer surface of the inner support 1. Conductor 2 is preferably a superconducting tape to reduce attenuation.

[0045] A semiconductive layer 3 is wrapped around the outside of the conductor 2. The semiconductive layer 3 is assembled on the outside of the conductor 2 in an overlapping wrapping form.

[0046] An insulating layer 4 is disposed on the outside of the semiconductive layer 3; specifically, the insulating layer 4 is made of polypropylene laminated paper, and its thickness can be further designed later.

[0047] A shielding layer 5 is disposed on the outside of the insulating layer 4, and the shielding layer 5 is wound with flat copper strip;

[0048] The first support layer 6 is disposed on the outside of the shielding layer 5;

[0049] The first steel strip layer 7 is disposed on the outside of the first support strip layer 6;

[0050] The second support strip layer 8 is disposed on the outside of the first steel strip layer 7;

[0051] The second steel strip layer 9 is arranged outside the second support strip layer 8, and a stable support structure can be formed by combining the first steel strip layer 7 and the second steel strip layer 9 through the first support strip layer 6 and the second support strip layer 8, so as to ensure the roundness of the whole cable.

[0052] The heat insulation layer 10 is arranged outside the second steel strip layer 9, and the heat insulation layer 10 can play a heat insulation role.

[0053] The Dewar layer 11 is arranged outside the heat insulation layer 10, and the Dewar layer 11 adopts a double-layer vacuum stainless steel corrugated pipe sleeve.

[0054] The outer protective layer 12 is arranged outside the Dewar layer 11, and specifically, a thermoplastic material is uniformly extruded outside the Dewar layer 11.

[0055] As shown in the figure, Figure 2 The inner support body 1 is designed as a copper pipe, and a groove 101 is arranged on the outer side of the inner support body 1, the groove 101 is spiral-shaped, and the conductor 2 is arranged inside the groove 101, that is, the groove is spiral-shaped and surrounds the surface of the copper pipe, and the groove size can be embedded in the stacked superconducting tape, that is, the conductor.

[0056] The conductor 2 is vertically stacked by a plurality of tapes, the depth of the groove 101 is 0.5mm-0.6mm, and the thickness of the tape is 0.1mm-0.2mm, so that the tape can be well embedded in the inside of the groove 101, and the tape is stacked and connected by low-temperature brazing.

[0057] The semi-conductive layer 3 is a semi-conductive wrapping tape layer, which adopts an overlapping wrapping form, and the insulating layer 4 is a polypropylene laminated paper winding layer.

[0058] The shielding layer 5 is a flat copper tape winding layer, the first support strip layer 6 and the second support strip layer 8 each include a polypropylene strip, and the outer diameter can be designed according to the gap requirement.

[0059] A plurality of through holes are arranged on the first steel strip layer 7 and the second steel strip layer 9.

[0060] The Dewar layer 11 is a double-layer vacuum stainless steel corrugated pipe, and the inner layer covers the heat insulation layer 10.

[0061] The thickness of the shielding layer is 0.2mm, the thickness of the insulating layer is 2mm, the thickness of the heat insulation layer is 3mm, and the thickness of the outer protective layer is 2mm.

[0062] The production steps of the present application are further described as follows:

[0063] Step S1: according to the cable design load flow combined with short circuit protection current, design the inner support body inner diameter and thickness, for example, 10kV / 3kA, the inner support body with thickness of 1mm can be used; the copper material RRR of the copper pipe is not less than 100;

[0064] Step 2: select the superconducting tape thickness of 0.17mm, three layers of superposition thickness of 0.5mm, and superimpose 3 layers;

[0065] Step 3: the combined stacked conductor outer layer is wrapped with a semi-conductive tape, and the semi-conductive tape has a thickness of 0.13mm; the insulation layer adopts a PPLP composite tape, and the insulation thickness is 2mm after being wrapped in multiple layers under the 10kV voltage level;

[0066] Step 4: the shielding layer is wrapped with a thickness of 0.2mm purple copper tape;

[0067] Step 5: select a polypropylene support strip with an outer diameter of 2.5mm and wrap it outside the shielding layer; the polypropylene support strip is wrapped with a 0.5mm thick tape round hole steel belt, and the steel belt round hole has a diameter of 3mm; the above structure is repeated to process two layers;

[0068] Step 6: the outer side of the above steel belt layer is wrapped with an aluminum foil composite heat insulation layer, and the heat insulation layer has a thickness of 3mm;

[0069] Step 7: a layer of longitudinal wrapping corrugated inner dewar layer is processed outside the heat insulation layer, the inner dewar layer adopts a thickness of 0.2mm steel belt, and is welded by using argon arc welding process;

[0070] Step 8: the outer side of the inner dewar layer is wrapped with a heat insulation layer with a thickness of 3mm; the outer dewar is processed by using the same process as step 7, and the gap between the outer dewar and the inner dewar is 50mm;

[0071] Step 9: a layer of thermoplastic polyolefin protective layer with a thickness of 2mm is extruded and wrapped outside the outer dewar.

[0072] In the specification of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail, so as not to obscure the understanding of the specification.

[0073] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0074] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A high current low loss stacked conductor high temperature superconducting cable, characterized by, Include: Inner support (1); Conductor (2), around the outer surface of the inner support (1); Semi-conductive layer (3), wrapped outside the conductor (2); Insulating layer (4), provided outside the semi-conductive layer (3); Shielding layer (5), provided outside the insulating layer (4); First support strip layer (6), provided outside the shielding layer (5); First steel belt layer (7), provided outside the first support strip layer (6); Second support strip layer (8), provided outside the first steel belt layer (7); Second steel belt layer (9), provided outside the second support strip layer (8); Thermal insulation layer (10), provided outside the second steel belt layer (9); Dewar layer (11), provided outside the thermal insulation layer (10); Outer protective layer (12), provided outside the dewar layer (11).

2. The high current low loss stacked conductor high temperature superconducting cable of claim 1, wherein, The inner support (1) is a copper pipe, and the outer side of the inner support (1) is provided with a groove (101), the groove (101) is spiral, and the groove (101) is provided with the conductor (2) inside.

3. The high current low loss stacked conductor high temperature superconducting cable of claim 2, wherein, The conductor (2) is composed of a plurality of vertically stacked tapes.

4. The high current low loss stacked conductor high temperature superconducting cable of claim 3, wherein, The depth of the groove (101) is 0.5mm-0.6mm, and the thickness of the tape is 0.1mm-0.2mm.

5. The high current low loss stacked conductor high temperature superconducting cable of claim 1 wherein, The semi-conductive layer (3) is a semi-conductive wrapping tape layer, and the insulating layer (4) is a polypropylene laminated paper winding layer.

6. The high current low loss stacked conductor high temperature superconducting cable of claim 1, wherein, The shielding layer (5) is a flat copper band winding layer, and the first support strip layer (6) and the second support strip layer (8) each include a polypropylene strip.

7. The high current low loss stacked conductor high temperature superconducting cable of claim 1 wherein, The first steel belt layer (7) and the second steel belt layer (9) are provided with a plurality of through holes.

8. The high current low loss stacked conductor high temperature superconducting cable of claim 1, wherein, The dewar layer (11) is a double-layer vacuum stainless steel corrugated pipe.

9. The high current low loss stacked conductor high temperature superconducting cable of claim 1 wherein, The thickness of the shielding layer (5) is 0.2mm, the thickness of the insulating layer (4) is 2mm, the thickness of the thermal insulation layer (10) is 3mm, and the thickness of the outer protective layer (12) is 2mm.

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