CN111210965A - Superconducting current limiter non-inductive coil and connection method thereof - Google Patents
Superconducting current limiter non-inductive coil and connection method thereof Download PDFInfo
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- CN111210965A CN111210965A CN202010120796.XA CN202010120796A CN111210965A CN 111210965 A CN111210965 A CN 111210965A CN 202010120796 A CN202010120796 A CN 202010120796A CN 111210965 A CN111210965 A CN 111210965A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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Abstract
According to the superconducting current limiter non-inductive coil and the connection method thereof, the manufactured winding inductance is basically and completely offset, the influence of a magnetic field on the performance of a superconducting tape can be ignored, and therefore the through-flow stability of the winding is guaranteed. Meanwhile, the welding position of the two strips adopts a front butt joint mode, so that the minimum resistance of the joint is ensured, the operation is simple, and the cost is saved. The non-inductive coil structure can be used as a unit module, and the unit module can obtain a resistive superconducting current limiter winding with any resistance value through different series-parallel combination. The non-inductive coil has the advantages of simple structure, convenient operation, small joint resistance and the like, thereby being widely applied to non-inductive superconducting windings or superconducting magnets.
Description
Technical Field
The invention relates to a non-inductive coil of a superconducting current limiter and a connection method thereof, belongs to the technical scheme in the field of superconducting application magnets, is suitable for a non-inductive coil structure wound by a superconducting strip, and is particularly suitable for a current limiting unit of a resistance type superconducting current limiter.
Background
With the wide application of superconducting tapes in power systems, people pay more attention to the influence of a magnetic field generated after the superconducting tape is wound into a coil on the performance of the superconducting tape. In practical application, the inductance generated after the winding and parallel connection electrifying of the plurality of superconducting strips is unfavorable, the superconducting coil without the inductance completely enables the product to run more stably, the energy loss is reduced, the interference to other running equipment of a power grid is reduced, and in addition, the problem of uniformity of the structure of the overlapped superconducting strips and the parallel coil can be improved and solved to the greatest extent.
Therefore, various non-inductive coils with different structures can be produced, wherein the non-inductive coils comprise eight-diagram type non-inductive coil structures, non-inductive coil structures connected with the same-name ends and the like. The former requires that the strip material should meet the length requirement of a group of non-inductive coils, the finished product rate of the preparation of the superconducting long strip is still a common problem for superconducting strip material manufacturers at present, the length of a single strip material is reduced as far as possible when the coil is designed, and the joint of the superconducting strip material is also one of the problems at present. In addition, for a large-current non-inductive coil, the problem of transposition of the superconducting strips needs to be considered when a plurality of superconducting strips are adopted for winding, and the problem is a difficult process problem for the superconducting strips; the two independent coils of the latter still have certain inductance due to the fact that the two independent coils are not identical, and the inductance is larger for the non-inductive coil with larger current.
Based on various problems brought by the non-inductive coil structure, the invention provides the non-inductive coil structure and the connection method thereof, which can reduce the length requirement of a single superconducting strip and can completely offset the magnetic fields generated by two coils. The non-inductive coil needs to pay attention to the winding direction and connection problem of two strips during winding. If lap winding is adopted and current in the same direction is introduced in the winding process of the two strips, the directions of the generated inductances are the same, so that the magnetic field intensity of the winding is enhanced, and the use efficiency of the superconducting strips is reduced; in addition, attention should be paid to the connection mode of using the minimum joint resistance at the connection position of the bottom of the strip, the connection instability is prevented, and the reactive power increase caused by the overhigh partial pressure is avoided.
In order to solve the problems existing in the winding process of the superconducting tapes, the invention provides a winding method of the superconducting tapes, two superconducting tapes are wound oppositely on the front sides during winding, the front sides of the two superconducting tapes can be welded at the joint of the bottoms, the resistance of a connector is minimum, and the inductance of the two superconducting tapes is minimum after the two superconducting tapes are electrified and can be almost ignored. The method has clear principle, simplicity and clarity, easy operation, low cost and small energy loss, and is an ideal superconducting tape winding method.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a superconducting current limiter non-inductive coil and a connection method thereof, which can completely offset magnetic fluxes generated by two coils of the non-inductive coil.
In order to solve the technical problem, the invention provides a superconducting current limiter non-inductive coil which is formed by winding two superconducting strips in a lap mode, wherein one ends of the two superconducting strips are welded, and the other ends of the two superconducting strips are respectively a current inlet end and a current outlet end.
Preferably, the superconducting tape comprises a superconducting bare tape and an outer cladding layer coated outside the superconducting bare tape.
Preferably, the superconducting bare belt is provided with a front surface and a back surface, the front surface of the superconducting bare belt is a silver-plated surface, and the back surface of the superconducting bare belt is a base belt surface.
Preferably, the front surfaces of the two superconducting tapes of the non-inductive coil are arranged oppositely.
Preferably, the non-inductive coil is a solenoid coil or a pancake coil or other structural type coil.
The application also provides a series-parallel connection structure of the superconducting current limiter non-inductive coil.
The application also provides a manufacturing method of the superconducting current limiter non-inductive coil, which comprises the following steps of (1) adding solder between outer coating layers on the front surfaces of two superconducting strips, and heating to obtain a welding joint of the superconducting strips; (2) and the two strip materials are wound to form the non-inductive coil.
Preferably, the step (2) is specifically to lap-wind two tapes with their front surfaces facing each other, and an insulating layer may be disposed between the two tapes or a superconducting tape with insulation may be used.
The inductance of the winding manufactured by the superconducting current limiter non-inductive coil and the connection method thereof is basically and completely offset, and the influence of a magnetic field on the performance of the superconducting strip can be ignored, so that the stability of the through-flow of the winding is ensured. Meanwhile, the welding position of the two strips adopts a front butt joint mode, so that the minimum resistance of the joint is ensured, the operation is simple, and the cost is saved. The non-inductive coil structure can be used as a unit module, and the unit module can obtain a resistive superconducting current limiter winding with any resistance value through different series-parallel combination. The non-inductive coil has the advantages of simple structure, convenient operation, small joint resistance and the like, thereby being widely applied to non-inductive superconducting windings or superconducting magnets.
Drawings
FIG. 1 is a schematic view of welding two superconducting tapes;
FIG. 2 is a schematic diagram of a non-inductive coil configuration;
FIG. 3 is a schematic diagram of the series connection of non-inductive coils;
fig. 4 is a schematic diagram of parallel connection of non-inductive coils.
Wherein: 1. welding flux; 2. a superconducting bare tape; 3. an outer cladding layer; 4. a front side; 5. and (4) the reverse side.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 2, the superconducting current limiter non-inductive coil according to the present invention is formed by winding two superconducting tapes, one end of each of the two superconducting tapes is welded, and the other ends of the two superconducting tapes are current inlet and outlet ends. As shown in fig. 1, the superconducting tape includes a bare superconducting tape 2 and an outer cladding layer 3 coated outside the bare superconducting tape 2. The superconducting bare belt 2 is provided with a front surface 4 and a back surface 5, the front surface 4 of the superconducting bare belt 2 is a silver-plated surface, and the back surface 5 of the superconducting bare belt 2 is a base belt surface. The front surfaces 4 of the two superconducting strips of the non-inductive coil are oppositely arranged.
In the invention, the non-inductive coil is a solenoid coil or a pancake coil, or other structural type coils.
The invention also provides a winding method of the non-inductive coil, which comprises the following steps of (1) adding the solder 1 between the outer cladding layers 3 of the two superconducting tapes, and heating to obtain the welding joint of the superconducting tapes; (2) and the two strip materials are wound to form the non-inductive coil. In a preferred embodiment, the step (2) is specifically to wrap the two strips with their front surfaces facing each other, and an insulating layer may be disposed between the two strips, and the thickness of the insulating layer is determined by the voltage level. Therefore, the magnetic field generated after the current flows is small, the influence on the critical current of the superconducting strip is ignored, and in addition, according to the calculation result, the inductance value of the superconducting current limiting unit is small, and the influence on the impedance of the system in steady-state operation is small.
As shown in fig. 3, in the non-inductive magnet obtained by connecting multiple groups of non-inductive coils in series, the head end of one strip of the first coil is used as a wire inlet end, the head end of the other strip is used as a wire outlet end, the wire outlet end of the first coil is connected in series with the wire inlet end of the second coil through a conductor, the wire outlet end of the second coil is connected in series with the wire inlet end of the third coil through another conductor, and so on.
As shown in fig. 4, in the non-inductive magnet obtained by connecting multiple groups of non-inductive coils in parallel, the incoming line ends of all the coils are connected, and the outgoing line ends of all the coils are connected, so as to form the parallel non-inductive magnet.
Besides, the non-inductive magnet obtained by the method that a plurality of groups of non-inductive coils are connected in parallel and then connected in series or connected in series and then connected in parallel or in a mixed connection mode is in the protection scope of the invention.
The invention discloses an inductance-free coil structure with mutually counteracted inductances. The key points of the invention are as follows: firstly, the structure can ensure that the two overlapped strip materials do not need to be transposed, and the non-inductive coils wound by the two strip materials can be basically considered to be equal in size and opposite in direction, so that the generated inductance is almost zero; secondly, the welding of the two strips can be realized by welding the strips, and the surface-to-surface welding mode of the superconducting strips with the minimum joint resistance can be realized; thirdly, the modular non-inductive coils can be connected in series and combined at will, and the parallel connection ensures that the lengths of the superconducting tapes of all the coils connected in parallel are the same, so that the current equalizing effect can be realized.
According to the resistance type superconducting direct current limiting non-inductive coil structure and the connection method thereof, the manufactured winding inductance is basically and completely offset, the influence of a magnetic field on the performance of a superconducting tape can be ignored, and therefore the stability of the through-flow of the winding is guaranteed. Meanwhile, the welding position of the two strips adopts a mode of front surface 4 butt joint, so that the minimum resistance of the joint is ensured, the operation is simple, and the cost is saved. The non-inductive coil structure can be used as a unit module, and the unit module can obtain a resistive superconducting current limiter winding with any resistance value through different series-parallel combination. The non-inductive coil has the advantages of simple structure, convenient operation, small joint resistance and the like, thereby being widely applied to non-inductive superconducting windings or superconducting magnets.
Taking 8 superconducting windings of a superconducting non-inductive coil structure as an example, if the length of a single strip in the prior art of the eight-diagram coil structure requires 100m, according to the non-inductive coil structure of the invention, the length of the strip only needs 50 m; or according to the conventional non-inductive coil under the condition that the lengths of the strips are equal, 4 of the 7 joints are changed into the welding of two superconducting strips from the original terminal welding, so that the resistance of the joints is greatly reduced.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A non-inductive coil of a superconducting current limiter is characterized in that the non-inductive coil is formed by winding two superconducting strips in a lap mode, one end portions of the two superconducting strips are welded, and the other end portions of the two superconducting strips are current inlet ends and current outlet ends respectively.
2. The superconducting current limiter noninductive coil as defined in claim 2, wherein said superconducting tape comprises a bare superconducting tape and an outer cladding layer covering said bare superconducting tape.
3. A superconducting current limiter noninductive coil according to claim 3, wherein the bare superconducting tape has a front surface and a back surface, the front surface of the bare superconducting tape is a silver-plated surface, and the back surface of the bare superconducting tape is a base tape surface.
4. A superconducting current limiter noninductive coil as defined in claim 3, wherein the front surfaces of the two superconducting tapes of said noninductive coil are disposed opposite to each other.
5. A superconducting current limiter noninductive coil as in claim 1, wherein said noninductive coil is a solenoid coil or pancake coil.
6. A series-connected structure of superconducting current limiter non-inductive coils according to any one of claims 1 to 5.
7. A method for connecting a superconducting current limiter non-inductive coil according to any one of claims 1 to 4, wherein the method comprises the steps of (1) adding solder between the front side outer cladding layers of two superconducting tapes, and heating to obtain a solder joint of the superconducting tapes; (2) and the two strip materials are wound to form the non-inductive coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010120796.XA CN111210965A (en) | 2020-02-26 | 2020-02-26 | Superconducting current limiter non-inductive coil and connection method thereof |
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| CN202010120796.XA CN111210965A (en) | 2020-02-26 | 2020-02-26 | Superconducting current limiter non-inductive coil and connection method thereof |
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| CN111210965A true CN111210965A (en) | 2020-05-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688287A (en) * | 2021-01-19 | 2021-04-20 | 中天集团上海超导技术有限公司 | Current limiting unit of involute type superconducting fault current limiter |
| CN113035488A (en) * | 2021-04-20 | 2021-06-25 | 北京交通大学 | Double-cake type non-inductive superconducting current-limiting coil |
-
2020
- 2020-02-26 CN CN202010120796.XA patent/CN111210965A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688287A (en) * | 2021-01-19 | 2021-04-20 | 中天集团上海超导技术有限公司 | Current limiting unit of involute type superconducting fault current limiter |
| CN113035488A (en) * | 2021-04-20 | 2021-06-25 | 北京交通大学 | Double-cake type non-inductive superconducting current-limiting coil |
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