CN214848140U

CN214848140U - Magnetic shunt for plate-type clamping piece of transformer

Info

Publication number: CN214848140U
Application number: CN202121463214.4U
Authority: CN
Inventors: 陈丽平; 吕涵; 肖威; 徐丹
Original assignee: Changzhou Xd Transformer Co ltd; China XD Electric Co Ltd
Current assignee: Changzhou Xd Transformer Co ltd; China XD Electric Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-23
Anticipated expiration: 2031-06-29

Abstract

The utility model belongs to the technical field of transformers, and discloses a magnetic shunt of a plate-type clamping piece of a transformer, which comprises a plurality of clamping piece boxes; a magnetic shield is arranged in the clamp box; the clamping piece box is horizontally arranged at the upper part or the lower part of the transformer coil; the clamping piece box is fixedly connected with a corresponding clamping piece web plate which is vertically arranged. The utility model relates to a board-like folder magnetism of transformer is shut, has increased the folder magnetic screen and to the regional coverage area of coil magnetic leakage, can effectively weaken the magnetic leakage problem that the coil brought, is showing the stray loss that reduces in folder and the oil tank, prevents overheated, guarantee transformer operation life.

Description

Magnetic shunt for plate-type clamping piece of transformer

Technical Field

The utility model belongs to the technical field of the transformer, concretely relates to board-like folder magnetism of transformer is shut.

Background

With the continuous development of social economy, the demand of people for electric energy is increasing day by day, and transformers with high capacity and high voltage level become extremely critical electrical equipment. The improvement of the transformer capacity and the voltage level brings huge challenges to the control of the leakage magnetic loss. The leakage field is generated by the current in the transformer coil and the leads. The leakage magnetic field and the distribution thereof determine the short-circuit impedance of the transformer, the mechanical force of a winding and the stray loss of a structural part, and the concentration of the leakage magnetic field can also cause local overheating, so that the thermal aging of an insulating material is caused, and the service life of the transformer is influenced. A common method for reducing leakage losses is to install magnetic shields, the most common of which are tank and clamp magnetic shields.

Therefore, how to make the magnetic shield exert the maximum benefit and further reduce the leakage magnetic loss is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a transformer plate clamp magnetism is along separate routes, utilizes limited magnetism along separate routes structure to the maximize, improves the absorptive capacity to the magnetic leakage.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

a magnetic shunt for a plate-type clamp of a transformer comprises a plurality of clamp boxes;

a magnetic shield is arranged in the clamp box;

the clamping piece box is horizontally arranged at the upper part or the lower part of the transformer coil;

the clamping piece box is fixedly connected with a corresponding clamping piece web plate which is vertically arranged.

The utility model discloses further improvement lies in: the magnetic shield is formed by stacking a plurality of silicon steel sheets.

The utility model discloses further improvement lies in: the periphery of the silicon steel sheet is wrapped with a layer of epoxy resin.

The utility model discloses further improvement lies in: the included angle between the clamping piece box and the corresponding clamping piece web plate which is vertically arranged is 30-90 degrees.

The utility model discloses further improvement lies in: the clamping piece box is fixed on the clamping piece box through an insulating screw rod nut, and the clamping piece box (1) is welded on a corresponding clamping piece web plate.

The utility model discloses further improvement lies in: comprises two clamping piece webs; the two clamping piece webs are arranged in parallel, and the part of the transformer core is positioned between the two clamping piece webs.

The utility model discloses further improvement lies in: a shielding plate is arranged between the magnetic shield and the first pressing block; the magnetic shield and the shielding plate are fixed on the clamping piece box through insulating screw nuts; the first pressing block penetrates through the shielding plate and the magnetic shielding plate through the insulating screw and the insulating nut and is fixed with the clamping piece box.

The utility model discloses further improvement lies in: the magnetic shield has a stepped portion at the end near the web of the clip; the stepped part is covered with a stepped cushion block, and the stepped cushion block is fixed on the magnetic shield through a second pressing block.

The utility model discloses further improvement lies in: a rib plate is arranged between the clamping piece box and the clamping piece web plate.

The utility model discloses further improvement lies in: the number of the steps at the tail end of the magnetic shield close to the iron core corresponds to the number of the iron core stages at the equal-height position.

The utility model discloses following beneficial effect has:

the utility model relates to a board-like folder magnetism of transformer is shut, has increased the folder magnetic screen and to the regional coverage area of coil magnetic leakage, can effectively weaken the magnetic leakage problem that the coil brought, is showing the stray loss that reduces in folder and the oil tank, prevents overheated, guarantee transformer operation life.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:

fig. 1 is a top view of a magnetic shunt of a transformer plate clamp according to the present invention;

fig. 2 is a partial left side view of a magnetic shunt of the transformer clip of fig. 1.

Reference numerals: 1. a clip box; 2. an insulating screw nut; 3. magnetic shielding; 4. a clamp web; 5. briquetting; 6. a stepped cushion block; 7. a shielding plate; 8. and (7) briquetting.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present invention provides a magnetic shunt for a plate-type clamp of a transformer, which is disposed on the upper portion and/or the lower portion of a transformer coil 20; comprising eight metallic clip boxes 1 and two clip webs 4.

The silicon steel sheets are treated by epoxy resin and stacked to form an integral magnetic shield 3. Horizontally placing the clamp box 1 and fixing the clamp box at an angle theta with a vertically arranged clamp web 4; the angle theta is 30-90 degrees. The magnetic shield 3 is placed in the clamp box 1, the shielding plate 7 is placed between the magnetic shield 3 and the pressing block 8, and the insulating screw nut 2 is used for fixing the magnetic shield 3, the shielding plate 7 and the clamp box 1, so that the

magnetic shields

3 and 1 are more attached; the clamp box 1 is welded on the corresponding clamp web 4; the pressing block 8 passes through the shielding plate 7 and the magnetic shield 3 through the insulating screw nut 21 and is fixed with the clamping piece box 1. The stepped portion of the end of the magnetic shield 3 is covered with a stepped spacer 6 and fixed using a press block 5. The number of the tail end steps of the magnetic shield 3 close to the iron core 10 corresponds to the number of the iron core steps at the equal height position; for example, the thickness of the magnetic shield 3 is 30mm, and 3 steps are provided at positions where the iron core steps are matched in height by 30mm, and the magnetic shield 3 is also a 3-step reverse step and is matched therewith.

The two clamping webs 4 are arranged in parallel, and the transformer core 10 is located between the two clamping webs 4.

Four of the eight metal clip boxes 1 are fixed at an angle theta to one clip web 4; the other four clip cassettes 1 are fixed at an angle θ to the other clip web 4. The clamping piece boxes 1 cover the transformer coil, and the adjacent clamping piece boxes 1 are arranged at intervals and cover most of the area of the end part of the transformer coil.

The clamp box 1 and the clamp web 4 are fixed through ribbed plates.

This magnetism shunts structure has increased the effective coverage area of magnetism shunts to the coil magnetic leakage region effectively, has better absorption to the magnetic leakage, can show and reduce stray loss, reduces the overheated risk of transformer in service, provides the guarantee for the even running of transformer.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.

Claims

1. A magnetic shunt for a plate-type clamp of a transformer is characterized by comprising a plurality of clamp boxes (1);

a magnetic shield (3) is arranged in the clamp box (1);

the clamp box (1) is horizontally arranged at the upper part or the lower part of the transformer coil (20);

the clamping piece box (1) is fixedly connected with a corresponding clamping piece web plate (4) which is vertically arranged.

2. A transformer clamp magnetic shunt according to claim 1, wherein said magnetic shield (3) is composed of a stack of silicon steel sheets.

3. A transformer plate clamp magnetic shunt according to claim 2, wherein the silicon steel sheet is coated with a layer of epoxy resin on the outer periphery.

4. A transformer clamp according to claim 1, wherein the angle between the clamp box (1) and the vertically disposed corresponding clamp web (4) is between 30 ° and 90 °.

5. A transformer clamp magnetic shunt according to claim 1, wherein the magnetic shield (3) is secured to the clamp box (1) by means of an insulated screw nut, the clamp box (1) being welded to the corresponding clamp web (4).

6. A transformer clamp magnetic shunt according to claim 1, comprising two clamp webs (4); the two clamping web plates (4) are arranged in parallel, and part of the transformer core (10) is positioned between the two clamping web plates (4).

7. A transformer clamp magnetic shunt according to claim 5, wherein a shield plate (7) is placed between the magnetic shield (3) and the first press block (8); the magnetic shield (3) and the shielding plate (7) are fixed on the clamping piece box (1) through insulating screw nuts; the first pressing block (8) penetrates through the shielding plate (7) and the magnetic shield (3) through the insulating screw and the insulating nut and is fixed with the clamping piece box (1).

8. A transformer clamp magnetic shunt according to claim 1, wherein the magnetic shield (3) has a stepped portion near the end of the clamp web (4); the stepped part is covered with a stepped cushion block (6), and the stepped cushion block (6) is fixed on the magnetic shield (3) through a second pressing block (5).

9. A transformer clamp according to claim 1, wherein ribs are provided between the clamp box (1) and the clamp web (4).

10. A transformer clamp according to claim 1, wherein the number of steps at the end of the magnetic shield (3) adjacent the core (10) corresponds to the number of steps at the core at the level of the core.