A magnetic field shunting device applied to the end of a concentric winding

Abstract

The present invention discloses a magnetic field shunting device applied to the end of a concentric winding, which relates to the technical field of electric power equipment, and includes: a skeleton, on which a first annular groove and a second annular groove are concentrically arranged, and a magnetic isolation plate is arranged in the first annular groove and the second annular groove; a first magnetic ring, which is arranged in the first annular groove, and has a first cutout adapted to the magnetic isolation plate in the first annular groove; a second magnetic ring, which is arranged in the second annular groove, and has a second cutout adapted to the magnetic isolation plate in the second annular groove; a first cover, which is arranged in the first annular groove and is used to encapsulate the first magnetic ring; and a second cover, which is arranged in the second annular groove and is used to encapsulate the second magnetic ring. The present invention can shunt the magnetic fields of the superconducting high-voltage winding and the superconducting low-voltage winding in the concentric winding into the magnetic circuit, reduce the radial magnetic field of the superconducting winding, and reduce the AC loss of the winding, so as to ensure high voltage.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, and more particularly to a magnetic field shunting device applied to the end of a concentric winding. Background Art

[0002] When a winding structure made of high-temperature superconducting tape is operated with AC current flowing through it, the radial magnetic field at the end of the winding will penetrate the surface of the superconducting tape, causing a large amount of AC loss at the end.

[0003] At present, power transformers often use concentric winding structures. This type of transformer consists of an iron core, a low-voltage winding, and a high-voltage winding from the inside to the outside. This structure allows the diffusion fields to be more easily closed through the magnetic circuit, thus effectively reducing stray magnetic flux.

[0004] Compared with the concentric winding structure of conventional transformers, the concentric winding structure of superconducting transformers made of superconducting materials has more stringent requirements on the distribution of magnetic fields. On the one hand, the superconducting structure needs to reduce the radial field at the end of the winding to reduce AC losses. On the other hand, due to the different distribution of magnetic circuits, more complex design solutions are required for magnetic field optimization.

[0005] Therefore, how to provide a magnetic field shunting device with a simple structure that can guide the radial magnetic field at the end of the winding to the space outside the winding, reduce AC loss, and improve winding efficiency is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] In view of this, the present invention provides a magnetic field shunting device applied to the end of a concentric winding, aiming to solve the problems in the above-mentioned background technology, reduce the AC loss at the end of the winding, and improve the winding efficiency.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A magnetic field shunting device applied to the end of a concentric winding, comprising:

[0009] A skeleton, wherein a first annular groove and a second annular groove are concentrically arranged on the skeleton, and a magnetic isolation plate is disposed in each of the first annular groove and the second annular groove;

[0010] A first magnetic ring, the first magnetic ring is arranged in the first annular groove, and the first magnetic ring has a first cutout adapted to the magnetic isolation plate in the first annular groove;

[0011] A second magnetic ring, the second magnetic ring is arranged in the second annular groove, and the second magnetic ring has a second cutout adapted to the magnetic isolation plate in the second annular groove;

[0012] a first sealing cover, the first sealing cover being arranged in the first annular groove and being used for encapsulating the first magnetic ring;

[0013] A second sealing cover is disposed in the second annular groove and is used to encapsulate the second magnetic ring.

[0014] Furthermore, the thickness of the magnetic isolation plate in the first annular groove is equal to the thickness of the first magnetic ring.

[0015] Furthermore, the width of the first annular groove is equal to the width of the first magnetic ring.

[0016] Furthermore, the thickness of the magnetic isolation plate in the second annular groove is equal to the thickness of the second magnetic ring.

[0017] Furthermore, the width of the second annular groove is equal to the width of the second magnetic ring.

[0018] Furthermore, the skeleton is an annular structure, and a plurality of arc-shaped holes are provided between the first annular groove and the second annular groove, and the plurality of arc-shaped holes are distributed in an annular array along the axis of the skeleton.

[0019] It can be known from the above technical scheme that compared with the prior art, the present invention discloses a magnetic field shunt device applied to the end of a concentric winding, by arranging a first annular groove and a second annular groove on the skeleton, respectively arranging a magnetic ring with a gap in the first annular groove and the second annular groove, and connecting the magnetic ring with the corresponding superconducting high-voltage winding and the superconducting low-voltage winding. The magnetic fields of the superconducting high-voltage winding and the superconducting low-voltage winding in the concentric winding can be shunted into the magnetic circuit, thereby reducing the radial magnetic field of the superconducting winding, and reducing the AC loss of the winding, thereby ensuring high voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the explosion structure of the magnetic field shunting device provided by the present invention;

[0022] Figure 2 A schematic diagram of the structure of the skeleton provided by the present invention;

[0023] Figure 3 A schematic structural diagram of a first magnetic ring provided by the present invention;

[0024] Figure 4 A schematic structural diagram of a second magnetic ring provided by the present invention;

[0025] Figure 5 A structural schematic diagram of the magnetic field shunting device provided by the present invention applied to the end of a concentric winding superconducting transformer;

[0026] Figure 6 The present invention provides Figure 5 Cross-sectional view along the AA direction.

[0027] Among them: 1 is the skeleton; 2 is the first magnetic ring; 3 is the second magnetic ring; 4 is the first cover; 5 is the first annular groove; 6 is the second annular groove; 7 is the magnetic isolation plate; 8 is the first incision; 9 is the second incision; 10 is the superconducting high-voltage winding; 11 is the superconducting low-voltage winding; 12 is the second cover. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-6 The embodiment of the present invention discloses a magnetic field shunting device applied to the end of a concentric winding, comprising:

[0030] A skeleton 1, on which a first annular groove 5 and a second annular groove 6 are concentrically arranged, and a magnetic isolation plate 7 is disposed in each of the first annular groove 5 and the second annular groove 6;

[0031] A first magnetic ring 2, the first magnetic ring 2 is arranged in a first annular groove 5, and the first magnetic ring 2 has a first cutout 8 adapted to the magnetic isolation plate 7 in the first annular groove 5;

[0032] A second magnetic ring 3, the second magnetic ring 3 is arranged in the second annular groove 6, and the second magnetic ring 3 has a second cutout 9 adapted to the magnetic isolation plate 7 in the second annular groove 6;

[0033] A first sealing cover 4, which is arranged in the first annular groove 5 and is used to encapsulate the first magnetic ring 2;

[0034] The second sealing cover 12 is arranged in the second annular groove 6 and is used to encapsulate the second magnetic ring 3 .

[0035] Among them, the first annular groove 5 is located at the outer periphery of the second annular groove 6, and a first incision 8 is opened on the first magnetic ring 2, and a second incision 9 is opened on the second magnetic ring 3. Through the arrangement of the first incision 8 and the second incision 9, the eddy current loss of the first magnetic ring 2 and the second magnetic ring 3 can be reduced, and the magnetic field shunt device is respectively arranged at the two ends of the superconducting transformer of the concentric winding, so that the first annular groove 5 corresponds to the end of the superconducting high-voltage winding 10 in the superconducting transformer, and the second annular groove 6 corresponds to the end of the superconducting low-voltage winding 11 in the superconducting transformer. Specifically, the skeleton 1 is fixedly connected to the end of the liner of the superconducting high-voltage winding 10 and the end of the liner of the superconducting low-voltage winding 11, respectively. The first magnetic ring 2 is encapsulated in the first annular groove 5 by the first cover 4, and the second magnetic ring 3 is encapsulated in the second annular groove 6 by the second cover 12. In view of the fact that the space between the superconducting high-voltage winding 10 and the superconducting low-voltage winding 11 is a strong magnetic field area, a magnetic field shunt device is formed at the upper and lower ends of the superconducting high-voltage winding 10 and the superconducting low-voltage winding 11. A strong radial field is formed, because the width of the first magnetic ring 2 is greater than the thickness of the superconducting high-voltage winding 10, the width of the second magnetic ring 3 is greater than the thickness of the superconducting low-voltage winding 11, and the inner and outer sides of the first magnetic ring 2 are both greater than the inner and outer sides of the superconducting high-voltage winding 10 by a certain distance, and the inner and outer sides of the second magnetic ring 3 are both greater than the inner and outer sides of the superconducting low-voltage winding 11 by a certain distance, so that the radial magnetic field passing through the inner side of the superconducting high-voltage winding 10 and the radial magnetic field passing through the outer side of the superconducting low-voltage winding 11 are converted into a radial magnetic field passing through the magnetic field shunt device. Toward the field, at the same time, the structure can ensure that the radial field led to the magnetic field shunt device will not be led to the outside of the superconducting high-voltage winding 10 and the inside of the superconducting low-voltage winding 11; at the same time, the first magnetic ring 2 is connected to the superconducting high-voltage winding 10 with a wire, and the second magnetic ring 3 is connected to the superconducting low-voltage winding 11 with a wire, ensuring that the first magnetic ring 2 on the magnetic field shunt device and the superconducting high-voltage winding 10 form an equipotential, and the second magnetic ring 3 and the superconducting low-voltage winding 11 form an equipotential, thereby improving the voltage resistance performance of the magnetic field shunt device.

[0036] In this embodiment, the thickness of the magnetic isolation plate 7 in the first annular groove 5 is equal to the thickness of the first magnetic ring 2. The width of the first annular groove 5 is equal to the width of the first magnetic ring 2. In this way, when the first magnetic ring 2 is installed in the first annular groove 5, the upper surface of the first magnetic ring 2 is flush with the upper surface of the magnetic isolation plate 7 in the first annular groove 5, and the magnetic isolation plate 7 is used to achieve a magnetic isolation effect on the first magnetic ring 2, reducing the eddy current loss of the first magnetic ring 2, and at the same time, it is convenient to use the first cover 4 to completely encapsulate the first magnetic ring 2 in the first annular groove 5.

[0037] In this embodiment, the thickness of the magnetic isolation plate 7 in the second annular groove 6 is equal to the thickness of the second magnetic ring 3. The width of the second annular groove 6 is equal to the width of the second magnetic ring 3. In this way, when the second magnetic ring 3 is installed in the second annular groove 6, the upper surface of the second magnetic ring 3 is flush with the upper surface of the magnetic isolation plate 7 in the second annular groove 6, and the magnetic isolation plate 7 is used to achieve a magnetic isolation effect on the second magnetic ring 3, reducing the eddy current loss of the second magnetic ring 3, and at the same time, it is convenient to use the second cover 12 to completely encapsulate the second magnetic ring 3 in the second annular groove 6.

[0038] In the above embodiment, the skeleton 1 is an annular structure, and a plurality of arc-shaped holes are provided between the first annular groove 5 and the second annular groove 6 . The plurality of arc-shaped holes are distributed in an annular array along the axis of the skeleton 1 .

[0039] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic field shunting device applied to the end of a concentric winding, characterized in that: include: A skeleton, wherein a first annular groove and a second annular groove are concentrically arranged on the skeleton, and a magnetic isolation plate is disposed in each of the first annular groove and the second annular groove; A first magnetic ring, the first magnetic ring is arranged in the first annular groove, and the first magnetic ring has a first cutout adapted to the magnetic isolation plate in the first annular groove; A second magnetic ring, the second magnetic ring is arranged in the second annular groove, and the second magnetic ring has a second cutout adapted to the magnetic isolation plate in the second annular groove; a first sealing cover, the first sealing cover being arranged in the first annular groove and being used for encapsulating the first magnetic ring; A second sealing cover is disposed in the second annular groove and is used to encapsulate the second magnetic ring.

2. The magnetic field shunting device applied to the end of a concentric winding according to claim 1, characterized in that: The thickness of the magnetic isolation plate in the first annular groove is equal to the thickness of the first magnetic ring.

3. The magnetic field shunting device applied to the end of a concentric winding according to claim 1, characterized in that: The width of the first annular groove is equal to the width of the first magnetic ring.

4. The magnetic field shunting device applied to the end of a concentric winding according to claim 1, characterized in that: The thickness of the magnetic isolation plate in the second annular groove is equal to the thickness of the second magnetic ring.

5. The magnetic field shunting device applied to the end of a concentric winding according to claim 1, characterized in that: The width of the second annular groove is equal to the width of the second magnetic ring.

6. The magnetic field shunting device applied to the end of a concentric winding according to claim 1, characterized in that: The skeleton is an annular structure, and a plurality of arc-shaped holes are provided between the first annular groove and the second annular groove. The plurality of arc-shaped holes are distributed in an annular array along the axis of the skeleton.

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