Resistance type superconductive current-limiting fusing device and working method thereof

Abstract

The invention relates to a resistance-type superconducting current-limiting fusing device and a working method thereof, the superconducting current-limiting fusing device is made of a second-generation high-temperature superconducting strip packaged by stainless steel, and a narrow neck is processed on a stainless steel packaging layer of the superconducting current-limiting fusing device and is used for short-circuit fusing. Under the normal working condition, the superconducting current-limiting fusing device is in a superconducting state, heating and loss are basically zero, under the fault working condition, the superconducting current-limiting fusing device automatically quench the ultralimit current, the temperature rises due to heating, all layers of superconducting strips such as a superconducting layer, a silver layer, a substrate layer and a stainless steel layer at the narrow neck of the stainless steel packaging layer are rapidly fused under the action of high heat, and the superconducting strips are not damaged. And the on-off of the short-circuit current after current limiting is realized. Compared with the prior art, the fuse has the advantages of being simple in structure, high in through-current capacity, high in fusing speed, stable in fusing and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power system and automation, in particular to a resistance type superconducting current limiting fuse device and a working method thereof. BACKGROUND

[0002] With the continuous development of economic society, the capacity of power system is increasing, especially the large access of new energy power generation, which makes the short-circuit capacity of DC transmission and distribution system increasing, at the same time, the application scenarios of large short-circuit current and fast protection, such as rail transit, all-electric warships, all-electric aircraft, superconducting magnets, are increasing, and the demand for fast protection of large short-circuit current under high current capacity is also increasing. At present, the fuse is often used as a fast automatic protection method for large short-circuit current, but with the increase of current capacity, the volume, weight and cost of the conventional fuse are also increasing rapidly, and the high current capacity requires a large number of fuses in parallel, which will affect the breaking capacity and breaking speed of the fuse, making it difficult for the conventional fuse to meet the short-circuit protection demand under high current capacity.

[0003] With the continuous development of superconducting technology, the second generation of high temperature superconducting tape can realize zero resistance current under liquid nitrogen environment, and the current capacity is greatly enhanced. The second generation of high temperature superconducting tape packaged with stainless steel has the advantages of strong current capacity and large superconducting resistance, which can be used as a fuse to achieve melting by heating of superconducting after superconducting current limiting.

[0004] Chinese patent applications CN102522277B and CN102545141B realize fast melting by installing a heavy hammer on the superconducting tape. However, the use of the heavy hammer makes the structure of the superconducting fuse more complex, and the melting point of the superconducting fuse is uncertain, and the heat transfer and shunt of the heavy hammer may also affect the superconducting current limiting and melting performance of the superconducting tape. The narrow neck of the conventional fuse will seriously affect the current capacity of the superconducting tape. Therefore, how to ensure the current capacity of the superconducting tape while realizing stable and fast melting under short-circuit current has become an important difficulty affecting the application of superconducting fuse. SUMMARY

[0005] The purpose of the present application is to overcome the defects of the prior art and provide a resistance type superconducting current limiting fuse device and a working method thereof. By processing a narrow neck in the stainless steel packaging layer, the current capacity of the superconducting tape can be basically unchanged. Under fault conditions, the internal layer of the superconducting current limiting fuse device at the narrow neck of the stainless steel packaging layer is rapidly melted under the action of high heat, which can realize stable and fast melting of the superconducting fuse device under short-circuit.

[0006] The purpose of the present application is realized by the following technical solutions:

[0007] The application discloses a resistance type superconducting current-limiting fuse device, which is characterized in that a stainless steel packaging layer narrow neck is processed on a stainless steel packaging layer of a superconducting tape, and is used for fusing under a short circuit condition.

[0008] Further, the stainless steel packaging layer narrow neck is a notch processed on the stainless steel packaging layer of the superconducting tape, and can be processed on a single stainless steel layer or on two stainless steel layers; the size and quantity of the narrow neck can be adjusted according to requirements.

[0009] Further, the superconducting tape is a second-generation high-temperature superconducting tape packaged by stainless steel, including but not limited to yttrium barium copper oxide YBCO or bismuth strontium calcium copper oxide BSCCO, and can realize high current-carrying capacity under a normal condition and high current-limiting impedance under a fault condition.

[0010] Further, the superconducting current-limiting fuse device comprises a superconducting tape base layer, a superconducting tape superconducting layer arranged on the superconducting tape base layer, a superconducting tape silver layer arranged on the superconducting tape superconducting layer, a superconducting tape stainless steel packaging layer wrapped outside the superconducting tape base layer and the superconducting tape silver layer, and a stainless steel packaging layer narrow neck processed on the superconducting tape stainless steel packaging layer.

[0011] Compared with the prior art, the application has the following beneficial effects:

[0012] (1) Larger current-limiting capacity: the narrow neck of the stainless steel layer makes the superconducting tape have a larger superconducting resistance at the stainless steel narrow neck than the superconducting tape without the narrow neck, and the superconducting resistance is larger at the same temperature, and more heat is generated; and due to the smaller volume, the heat capacity is smaller at the same temperature, the temperature rise is larger under the short circuit current, and the resistance rises faster. The combined action of the two makes the current-limiting effect stronger.

[0013] (2) Faster and more stable fusing effect: The resistance of the resistive superconducting current limiting fuse device of the present invention is higher, more heat is generated and the temperature rise is greater near the narrow neck of the stainless steel encapsulation layer. Therefore, it can fuse faster near the narrow neck of the stainless steel than other positions, and the fusing point is more stable. This further improves the application effect of the superconducting current limiting fuse device and helps to improve the safety and stability of the system. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the strip material of a resistance-type superconducting current-limiting fuse.

[0015] Figure 2 A schematic diagram of a single narrow neck in a single-sided stainless steel layer of a resistive superconducting current-limiting fuse;

[0016] Figure 3 This is a schematic diagram of three narrow necks on each side of the stainless steel layer of a resistive superconducting current-limiting fuse.

[0017] Explanation of the labels in the diagram:

[0018] 1. Stainless steel encapsulation layer of superconducting tape; 2. Neck of stainless steel encapsulation layer; 3. Silver layer of superconducting tape; 4. Superconducting layer of superconducting tape; 5. Substrate layer of superconducting tape. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, taking AMSC 8602 tape as an example. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] like Figure 1 The figure shows a cross-sectional view of the strip of a resistance-type superconducting current-limiting fuse device. The superconducting strip used is a second-generation high-temperature superconducting strip encapsulated in stainless steel, including a superconducting strip superconducting layer 4, a superconducting strip substrate layer 5, a superconducting strip silver layer 3, and a superconducting strip stainless steel encapsulation layer 1. The superconducting strip superconducting layer 4 is disposed on the superconducting strip substrate layer 5, the superconducting strip silver layer 3 is disposed on the superconducting strip superconducting layer 4, and the superconducting strip stainless steel encapsulation layer 1 covers the outside of the superconducting strip substrate layer 5 and the superconducting strip silver layer 3.

[0021] like Figure 2 The diagram shows a single neck in the stainless steel encapsulation layer of a resistive superconducting current-limiting fuse. The diagram shows a single neck fabricated on only one side of the stainless steel encapsulation layer of the superconducting strip. In practice, multiple necks can be fabricated on both sides of the stainless steel encapsulation layer. The size and number of necks can be adjusted as needed.

[0022] likeFigure 3 As shown, each three narrow necks of the double-side stainless steel packaging layer of the resistance type superconducting current limiting fuse device are schematically shown, and similar to the common fuse device, the superconducting current limiting fuse device can be connected in series through multiple narrow diameters to realize higher voltage grade breaking.

[0023] Under normal working conditions, the resistance type superconducting current limiting fuse device is in a superconducting state with zero resistance, at this time, the narrow neck has no influence on the normal current of the superconducting current limiting fuse device, and the heat generation and loss of the superconducting current limiting fuse device is basically zero; under fault working conditions, the superconducting current limiting fuse device automatically loses superconductivity and current limiting, and generates heat and appears temperature rise, since the thickness of the stainless steel packaging layer at the narrow neck is thinner, the resistance is larger, the heat capacity is smaller, the heat generation is faster and the temperature rise is higher under the action of short circuit current, the narrow neck of the superconducting current limiting fuse device rapidly rises in temperature and is fused under the action of high heat, realizing breaking after short circuit current limiting.

[0024] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A resistive superconducting current limiting fuse device, characterized by, The superconducting current limiting fuse device has a stainless steel packaging layer narrow neck (2) processed on the stainless steel packaging layer of the superconducting tape, which is used for fusing under short circuit condition.

2. A resistive superconducting current limiting fuse device according to claim 1, wherein, The stainless steel packaging layer narrow neck (2) is a notch processed on the stainless steel packaging layer of the superconducting tape, one or more narrow necks are processed on the single side stainless steel packaging layer, or one or more narrow necks are processed on the two side stainless steel packaging layers, and the size and number of the narrow necks are adjusted as required.

3. A resistive superconducting current limiting fuse device according to claim 1, wherein, The superconducting tape is a stainless steel packaged second generation high temperature superconducting tape adopting yttrium barium copper oxide YBCO or bismuth strontium calcium copper oxide BSCCO, which can realize high current carrying capacity under normal condition and high current limiting impedance under fault condition.

4. A resistive superconducting current limiting fuse device according to claim 1, wherein, The superconducting current limiting fuse device comprises a superconducting tape base layer (5), a superconducting tape superconducting layer (4) arranged on the superconducting tape base layer (5), a superconducting tape silver layer (3) arranged on the superconducting tape superconducting layer (4), a superconducting tape stainless steel packaging layer (1) wrapped outside the superconducting tape base layer (5) and the superconducting tape silver layer (3), and a stainless steel packaging layer narrow neck (2) processed on the superconducting tape stainless steel packaging layer (1).

5. A method of operating a resistive superconducting current limiting fuse device according to any one of claims 1 to 4, characterized in that, Under normal condition, the superconducting current limiting fuse device is in superconducting state, and the heat generation and loss are zero; under fault condition, the superconducting current limiting fuse device automatically loses superconductivity and turns into resistance state current limiting, and generates heat and has temperature rise; the stainless steel packaging layer thickness at the narrow neck is thinner than that at the relative non-narrow neck, the resistance is larger, the heat capacity is smaller, the heat generation is faster under the action of short circuit current, the temperature rise is higher, the stainless steel packaging narrow neck rapidly rises in temperature and fuses under the action of high heat, and the short circuit current limiting opening is realized.

Images