A current-limiting high-temperature superconducting cable

Abstract

The embodiment of the present application discloses a current-limiting high-temperature superconducting cable, comprising: a skeleton, a conductor layer, an insulating layer, a shielding layer and a protective layer arranged in sequence from the inside to the outside; the conductor layer comprises multiple layers of first high-temperature superconducting tapes; multiple layers of first high-temperature superconducting tapes are spirally wound along the length direction; the spiral winding angles of each layer of first high-temperature superconducting tapes are not equal; the critical currents of each layer of first high-temperature superconducting tapes are not equal; each layer of first high-temperature superconducting tapes is insulated. The present invention effectively increases the current-limiting impedance change rate and current-limiting impedance size of the superconducting cable, thereby enabling the superconducting cable to have the characteristic of limiting fault current on the basis of being able to transmit large currents, and is a high-quality current-limiting high-temperature superconducting cable.

Description

Technical Field

[0001] The present application relates to the technical field of superconducting cables, and in particular to a current-limiting high-temperature superconducting cable. Background Art

[0002] The continuous improvement of people's requirements for quality of life has led to an increasingly heavy power load in urban areas, and the proportion of power electronic loads has increased. In addition, the access of a large number of new energy sources requires the power system to have a larger transmission capacity while improving power supply reliability. High-temperature superconducting cables utilize the unique excellent properties of superconductors. Compared with traditional cables, they have the advantages of small transmission impedance, large transmission capacity, low energy consumption, compact structure, small size, and small line reactive power demand. At a lower voltage level, they can have a larger transmission capacity, smaller line loss and electromagnetic heat loss, and less installation space. In the future, high-temperature superconducting cables are one of the most promising development directions.

[0003] With the continuous development of high-temperature superconducting power technology, more and more new high-temperature superconducting power equipment have been developed, and some of them have been put into demonstration operation. At present, the research on high-temperature superconducting cables not only focuses on single-machine equipment such as the cable body and supporting refrigeration equipment, but also pays more attention to the application of cables in the system. Therefore, it is necessary to fully explore the advantages of high-temperature superconductors so that high-temperature superconducting cables can not only transmit large currents, but also have the characteristics of limiting fault currents, and have the functions of two superconducting power equipment, superconducting cables and superconducting current limiters. However, the current limiting high-temperature superconducting cables are not mature enough in technology, and face the problems of low current limiting impedance change rate and low current limiting impedance. Most of the research on current limiting cables is limited to simple laboratory experimental research and simulation research. Actual engineering applications need further research, and the research and development of current limiting superconducting cables needs to be broken through. For this reason, the present invention proposes a current limiting high-temperature superconducting cable. Summary of the invention

[0004] The embodiment of the present application provides a current-limiting high-temperature superconducting cable, which effectively increases the current-limiting impedance change rate and the current-limiting impedance size of the superconducting cable, thereby enabling the superconducting cable to have the characteristic of limiting fault current while being able to transmit large currents.

[0005] In view of this, the present application provides a current-limiting high-temperature superconducting cable, comprising: a skeleton, a conductor layer, an insulating layer, a shielding layer and a protective layer arranged in sequence from the inside to the outside;

[0006] The conductor layer includes multiple layers of first high temperature superconducting tape;

[0007] Multiple layers of the first high temperature superconducting tape are spirally wound along the length direction;

[0008] The spiral winding angles of each layer of the first high temperature superconducting tape are not equal;

[0009] The critical current of each layer of the first high temperature superconducting tape is not equal;

[0010] Each layer of the first high temperature superconducting tape is insulated from each other.

[0011] Optionally, the multiple layers of first high-temperature superconducting tapes are spirally wound on the skeleton at a preset winding angle.

[0012] Optionally, the shielding layer comprises multiple layers of second high temperature superconducting tape;

[0013] Each layer of the second high temperature superconducting tape is insulated.

[0014] Optionally, the multiple layers of the second high temperature superconducting tape are spirally wound at a preset winding angle on the outside of the insulating layer.

[0015] Optionally, the spiral winding angles of each layer of the second high temperature superconducting tape are equal.

[0016] Optionally, a first semiconductive layer is provided on the inner surface of the insulating layer.

[0017] Optionally, a second semiconductive layer is provided on the outer surface of the insulating layer.

[0018] Optionally, the skeleton is made of copper stranded wire.

[0019] Optionally, the protective layer includes a heat insulating layer and a protective cover;

[0020] The protective cover is located on the outside of the heat insulation layer.

[0021] Optionally, the thermal insulation layer is a double-layer metal bellows.

[0022] It can be seen from the above technical scheme that the embodiment of the present application has the following advantages: a skeleton, a conductor layer, an insulating layer, a shielding layer and a protective layer are arranged in sequence from the inside to the outside, the conductor layer includes multiple layers of first high-temperature superconducting tapes, and the multiple layers of first high-temperature superconducting tapes are spirally wound along the length direction, wherein the spiral winding angles of each layer of the first high-temperature superconducting tape are not equal, the critical currents of each layer of the first high-temperature superconducting tape are not equal, and each layer of the first high-temperature superconducting tape is insulated from each other. By using superconducting tapes with different critical currents in the multiple layers of the first high-temperature superconducting tape layers and winding with variable winding angles along the length direction, the quenching speed of the superconducting cable is accelerated, thereby increasing the current limiting impedance change rate and the current limiting impedance size of the superconducting cable, so that the superconducting cable can transmit large currents and also has the characteristics of limiting fault current. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a current-limiting high-temperature superconducting cable in an embodiment of the present application;

[0024] Wherein, the accompanying drawings are marked as follows:

[0025] 1- skeleton, 2- conductor layer, 3- insulation layer, 4- shielding layer, 5- protective layer. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] This application provides an embodiment of a current-limiting high-temperature superconducting cable. Figure 1 .

[0030] The current-limiting high-temperature superconducting cable in this embodiment comprises: a skeleton 1, a conductor layer 2, an insulating layer 3, a shielding layer 4 and a protective layer 5 which are arranged in sequence from the inside to the outside, the conductor layer 2 comprises multiple layers of first high-temperature superconducting tapes, the multiple layers of first high-temperature superconducting tapes are spirally wound along the length direction, the spiral winding angles of each layer of the first high-temperature superconducting tapes are not equal, the critical currents of each layer of the first high-temperature superconducting tapes are not equal, and each layer of the first high-temperature superconducting tapes is insulated from each other.

[0031] It should be noted that: from the inside to the outside, a skeleton 1, a conductor layer 2, an insulating layer 3, a shielding layer 4 and a protective layer 5 are arranged in sequence, the conductor layer 2 includes multiple layers of first high-temperature superconducting tapes, and the multiple layers of first high-temperature superconducting tapes are spirally wound along the length direction, wherein the spiral winding angles of each layer of the first high-temperature superconducting tape are not equal, the critical currents of each layer of the first high-temperature superconducting tape are not equal, and each layer of the first high-temperature superconducting tapes is insulated from each other. By using superconducting tapes with different critical currents in the multiple layers of the first high-temperature superconducting tape layers and winding with variable winding angles along the length direction, the quenching speed of the superconducting cable is accelerated, thereby increasing the current limiting impedance change rate and the current limiting impedance size of the superconducting cable, so that the superconducting cable can not only transmit large currents, but also have the characteristics of limiting fault current.

[0032] The above is an embodiment of a current-limiting high-temperature superconducting cable provided in the embodiment of the present application. The following is an embodiment of a current-limiting high-temperature superconducting cable provided in the embodiment of the present application. For details, please refer to Figure 1 .

[0033] The current-limiting high-temperature superconducting cable in this embodiment includes: a skeleton 1, a conductor layer 2, an insulating layer 3, a shielding layer 4 and a protective layer 5 arranged in sequence from the inside to the outside; the conductor layer 2 includes multiple layers of first high-temperature superconducting tapes; the multiple layers of first high-temperature superconducting tapes are spirally wound along the length direction; the spiral winding angles of each layer of the first high-temperature superconducting tape are not equal; the critical current of each layer of the first high-temperature superconducting tape is not equal; each layer of the first high-temperature superconducting tape is insulated, specifically, the first high-temperature superconducting tape layers are subjected to insulation coating treatment.

[0034] It should be noted that the conductor layer 2 is formed by spirally winding multiple layers of first high-temperature superconducting tapes with different critical currents, which accelerates the quenching speed of the superconducting tape layer with a small critical current and increases the rising rate of the current-limiting impedance.

[0035] The multiple layers of the first high temperature superconducting tape are spirally wound on the skeleton 1 at a preset winding angle. Specifically, at different positions extending along the length direction of the superconducting cable, the first high temperature superconducting tape of the conductor layer 2 can be wound at different winding angles, so that the current limiting impedance of the superconducting cable can be adjusted and matched.

[0036] The shielding layer 4 includes multiple layers of second high-temperature superconducting tapes, each layer of which is insulated. Specifically, the layers of the second high-temperature superconducting tapes are subjected to insulation coating treatment; multiple layers of the second high-temperature superconducting tapes are spirally wound on the outside of the insulating layer 3 at a preset winding angle; the spiral winding angles of each layer of the second high-temperature superconducting tape are equal. The mutual inductance generated in this way can play a current limiting role during a large current impact process.

[0037] The inner surface of the insulating layer 3 is provided with a first semi-conductive layer, which can make the electric field on the outer surface of the conductive layer 2 uniform and avoid local discharge between the conductive layer 2 and the insulating layer 3 caused by the rough surface of the conductive layer 2.

[0038] The outer surface of the insulating layer 3 is provided with a second semiconductive layer, which is in good contact with the outer surface of the insulating layer 3 and has the same potential as the shielding layer 4, thereby avoiding local discharge with the shielding layer 4 due to defects such as cracks on the cable insulation surface.

[0039] The skeleton 1 is made of copper strands and serves as a support for the superconducting cable.

[0040] The protective layer 5 includes an insulating layer and a protective sleeve, and the protective sleeve is located outside the insulating layer. The insulating layer can be a double-layer metal bellows, which can achieve thermal insulation between the superconducting cable conductor and the external environment, ensuring that the superconducting cable conductor operates in a low-temperature environment.

[0041] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A current-limiting high-temperature superconducting cable, characterized in that: include: The skeleton, conductor layer, insulation layer, shielding layer and protective layer are arranged in sequence from the inside to the outside; The conductor layer includes multiple layers of first high temperature superconducting tape; Multiple layers of the first high temperature superconducting tape are spirally wound along the length direction; The spiral winding angles of each layer of the first high temperature superconducting tape are not equal; The critical current of each layer of the first high temperature superconducting tape is not equal; Each layer of the first high temperature superconducting tape is insulated; The shielding layer includes multiple layers of second high temperature superconducting tape; Each layer of the second high temperature superconducting tape is insulated; The spiral winding angles of each layer of the second high temperature superconducting tape are equal; The skeleton is made of copper stranded wire.

2. The current-limiting high-temperature superconducting cable according to claim 1, characterized in that: The multiple layers of first high-temperature superconducting tape are spirally wound on the skeleton at a preset winding angle.

3. The current-limiting high-temperature superconducting cable according to claim 1, characterized in that: The multi-layer second high-temperature superconducting tape is spirally wound at a preset winding angle on the outer side of the insulating layer.

4. The current-limiting high-temperature superconducting cable according to claim 1, characterized in that: The inner surface of the insulating layer is provided with a first semiconductive layer.

5. The current-limiting high-temperature superconducting cable according to claim 1, characterized in that: A second semiconductive layer is disposed on the outer surface of the insulating layer.

6. The current-limiting high-temperature superconducting cable according to claim 1, characterized in that: The protective layer includes a heat insulating layer and a protective cover; The protective cover is located on the outside of the heat insulation layer.

7. The current-limiting high-temperature superconducting cable according to claim 6, characterized in that: The heat insulation layer is a double-layer metal bellows.

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