CN211670102U

CN211670102U - Magnetic shielding structure and three-phase three-column transformer

Info

Publication number: CN211670102U
Application number: CN201921687195.6U
Authority: CN
Inventors: 摆建品; 董幸福; 高翔; 刘莹莹; 曹玉山; 高娃
Original assignee: TBEA Intelligent Electric Co Ltd; TBEA Beijing Tianjin Hebei Intelligent Technology Co Ltd
Current assignee: TBEA Intelligent Electric Co Ltd; TBEA Beijing Tianjin Hebei Intelligent Technology Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-10-13
Anticipated expiration: 2029-10-10

Abstract

The utility model provides a magnetic shielding structure, including tip magnetic shield (1) and indisputable yoke cushion (2), indisputable yoke cushion (2) are located iron core side post (7) the outside, be equipped with the magnetic shielding groove in indisputable yoke cushion (2), tip magnetic shield (1) are located in the magnetic shielding groove. Correspondingly, a three-phase three-column transformer is also provided. The utility model discloses magnetic shield structure can effectively reduce the loss that increases because of the magnetic leakage flux.

Description

Magnetic shielding structure and three-phase three-column transformer

Technical Field

The utility model belongs to the technical field of the transformer, a magnetism shielding structure and contain three-phase three-column transformer of magnetism shielding structure is related to.

Background

At present, the magnetic leakage in the large-capacity transformer can cause the increase of the stray loss of a structural part and generate local overheating. The outer side of an iron core side column of the three-phase three-column transformer is not provided with a side column or a side yoke structure, and the current shielding mode cannot effectively shield a coil on the iron core side column to generate magnetic leakage at the outer side part of the iron core, and the magnetic leakage can cause stray loss of a structural part and cause local overheating.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-phase three-column transformer to magnetic shield structure and contain this magnetic shield structure, this magnetic shield structure can shield the coil of iron core side post effectively and produce the magnetic leakage outside the iron core.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the utility model provides a magnetic shielding structure, including tip magnetic shielding and indisputable yoke cushion, indisputable yoke cushion is located the iron core side post outside, be equipped with the magnetic shielding groove in the indisputable yoke cushion, the tip magnetic shielding is located in the magnetic shielding groove.

Preferably, the end magnetic shield has a shape arranged around the core leg on a side close to the core leg in the first direction and is spaced apart from the core leg.

Preferably, the end magnetic shield includes a first portion and a second portion spaced apart from each other in a second direction perpendicular to the first direction, and the first portion and the second portion are symmetrically arranged with respect to a center line of the core leg in the first direction.

Preferably, the end magnetic shield is formed by stacking rectangular silicon steel sheets with different sizes in a second direction, and the second direction is consistent with the lamination direction of the iron core side column.

Preferably, the end magnetic shield is stepped in shape on a side close to the core side column in the first direction.

Preferably, the magnetic shield structure further includes an insulating plate, and the end magnetic shield is fixed in the yoke pad by the insulating plate.

Preferably, the magnetic shielding structure further comprises a grounding plate, and two ends of the grounding plate are respectively connected with the end magnetic shielding and the transformer clamping piece.

Preferably, the magnetic shielding structure further comprises an oil duct cushion block and an oil duct padding plate, the oil duct cushion block and the oil duct padding plate are located in a space between the end magnetic shielding plate and the insulating plate, and the oil duct cushion block is located between the end magnetic shielding plate and the oil duct padding plate.

The utility model also provides a three-phase three-column transformer, including two iron core side posts and an iron core center pillar, two iron core side posts are located the both sides of iron core center pillar respectively, the transformer still includes above the magnetic screen structure, the magnetic screen structure is located on the iron core side post.

Preferably, the magnetic shielding structure is provided at upper and lower portions of the core side column.

The utility model has the advantages as follows:

1. the utility model discloses a magnetic shielding structure, through set up the tip magnetic screen in the yoke cushion outside the iron core side post, can provide the magnetic path for the magnetic leakage that the coil of iron core side post produced outside the iron core, make this part magnetic leakage accomplish through magnetic screen, iron core and close, this kind of structure can guarantee to shield more magnetic leakages with less volume to reduce the loss that the magnetic leakage arouses on the folder, avoided local overheat;

2. the utility model adopts a magnetic shielding structure, the stacking direction of the silicon steel sheet lamination of the end magnetic shielding is consistent with the stacking direction of the lamination of the iron core side column, the end magnetic shielding is provided with a ladder shape arranged around the iron core side column at one side close to the iron core side column, so as to effectively lead the magnetic leakage of the transformer into the iron core, and the process operation of the lamination mode is convenient;

3. the magnetic shielding structure adopted by the utility model is placed in the upper and lower iron yoke cushion blocks, and the upper and lower iron yoke cushion blocks are provided with the magnetic shielding grooves matched with the magnetic shielding shape, and meanwhile, the magnetic shielding is divided into two parts which are symmetrically arranged relative to the central line of the iron core side column, so that the single magnetic shielding volume is smaller, and the transformer body assembly is convenient;

4. the magnetic shielding structure adopted by the utility model also comprises an insulating plate, the end magnetic shielding is fixed in the iron yoke cushion block through the insulating plate, and the insulating plate insulates the magnetic shielding structure from external parts, thereby reducing magnetic leakage;

5. the utility model discloses a magnetic shielding structure set up the heat dissipation oil duct, avoided the local overheat of magnetic shielding structure itself.

Drawings

Fig. 1 is a plan view of the magnetic shield structure of the present invention;

FIG. 2 is a front view of a magnetic shield structure for the A phase of the core leg;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

in the figure: 1-end magnetic shielding; 2-yoke pad block; 3-oil duct cushion blocks; 4-oil duct liner board; 5-an insulating plate; 6-a grounding plate; 7-iron core side column.

Detailed Description

The following describes in detail a specific embodiment of the present invention with reference to the drawings.

Example 1:

as shown in fig. 1, the present embodiment discloses a magnetic shielding structure, which includes an end magnetic shielding 1 and an iron yoke spacer 2, wherein the iron yoke spacer 2 is located outside the iron core side column 7, a magnetic shielding groove is provided in the iron yoke spacer 2, and the end magnetic shielding 1 is provided in the magnetic shielding groove.

For a three-phase transformer, the three-phase transformer comprises three core legs, wherein the core legs are two core legs which are positioned at the outer side.

Example 2:

the utility model discloses a magnetic shielding structure, it is applied to three-phase three-column transformer in, consequently will use three-phase three-column transformer to describe magnetic shielding structure as an example below. The three-phase three-column transformer comprises three iron core columns, namely an A-phase iron core column, a B-phase iron core column and a C-phase iron core column, wherein the A-phase iron core column and the C-phase iron core column are respectively positioned on two sides of the B-phase iron core column, also called iron core side columns, and the B-phase iron core column positioned between the A-phase iron core side column and the C-phase iron core side column is also called a B-phase iron core center column.

In this embodiment, a magnetic shielding structure is provided on each of the a-phase core leg and the C-phase core leg.

Since the magnetic shield structure of the C-phase core side column is substantially the same as that of the a-phase core side column, the magnetic shield structure of the a-phase core side column will be described hereinafter as an example.

Fig. 1 is a schematic plan view of a magnetic shield structure of an iron core side column (a phase) 7 in an upper yoke spacer according to the present invention. Fig. 2 is a front view of the magnetic shield structure according to the present invention. Fig. 3 is a sectional view taken along line B-B in fig. 1. The yoke cushion includes yoke cushion and lower yoke cushion, and magnetic shielding structure can set up in yoke cushion and yoke cushion down last yoke cushion, because magnetic shielding structure in the yoke cushion is similar basically with the magnetic shielding structure in the yoke cushion down, will describe for the example yoke cushion above consequently in the following the embodiment of the utility model discloses a.

Referring to fig. 1 to 3, the magnetic shield structure of the present embodiment may include an end magnetic shield 1, an iron yoke spacer 2, an oil passage spacer 3, an oil passage spacer plate 4, an insulating plate 5, and a ground plate 6.

The end magnetic shield 1 is installed in a portion of the yoke spacer 2 located outside the core side post 7, thereby providing a magnetic path for leakage flux generated outside the core side post 7. The iron yoke cushion block 2 is provided with a magnetic shielding groove matched with the shape of the end magnetic shielding 1, so that a high-permeability silicon steel sheet to be described later is placed in the magnetic shielding groove along the lamination direction of the iron core side column 7. The end magnetic shield 1 has a shape arranged around the core side column 7 on the side close to the core side column 7 in the first direction D1, and is spaced apart from the core side column 7. At this time, the smaller the distance separating the end magnetic shield 1 from the core leg 7, the more advantageous the end magnetic shield 1 introduces the magnetic flux into the core leg 7 as much as possible. Such an end magnetic shield 1 can close the leakage flux generated outside the core side post 7 through the end magnetic shield 1 and the core side post 7.

The end magnetic shield 1 includes the first portion 1a and the second portion 1b spaced apart from each other in the second direction D2 in the yoke spacer 2, and the first portion 1a and the second portion 1b are symmetrically arranged with respect to the center line of the core side column 7 in the first direction D1, so that it is possible to secure shielding of more leakage flux with a smaller volume. Further, the second direction D2 may be perpendicular to the first direction D1, but is not limited thereto.

The end magnetic shield 1 is composed of rectangular silicon steel sheets different in size. For example, the end magnetic shield 1 may include a plurality of rectangular silicon steel sheets different in width and length. In addition, the stacking direction of the rectangular silicon steel sheets of the end magnetic shield 1 is the same as the stacking direction of the lamination sheets of the core side column 7, so that the magnetic leakage of the transformer is effectively guided into the core, and the operation is convenient. For example, the laminations of the rectangular silicon steel sheets of the end magnetic shield 1 and the core side column 7 are stacked in the second direction D2. In this case, the shape of the end magnetic shield 1 on the side closer to the iron core side column 7 in the first direction D1 is stepped, but is not limited thereto.

The magnetic shield structure further includes an insulating plate 5, the end portion magnetic shield 1 is fixed in the yoke pad 2 through the insulating plate 5, and the insulating plate 5 can insulate the magnetic shield structure from external parts, thereby reducing magnetic leakage.

The magnetic shielding structure further comprises a grounding strip 6, and two ends of the grounding strip 6 are respectively connected with the end magnetic shielding 1 and the transformer clamping piece, so that potential grounding is guaranteed through a clamping piece grounding device (not shown in the figure). The grounding plate 6 may be a grounded copper strip, but is not limited thereto.

The magnetic shielding structure further comprises an oil duct cushion block 3 and an oil duct cushion board 4. The oil duct cushion block 3 and the oil duct cushion board 4 are located in a space between the end portion magnetic shielding 1 and the insulating board 5, and the oil duct cushion block 3 is located between the end portion magnetic shielding 1 and the oil duct cushion board 4. The oil duct cushion blocks 3 and the oil duct cushion paper plates 4 are arranged to ensure reliable heat dissipation and air leakage of the magnetic shielding.

Further, the size of the magnetic shield structure according to the present embodiment can be changed depending on the application thereof.

The magnetic shielding structure with the step shape according to the embodiment can shield and guide magnetic flux, and reduce leakage flux entering a transformer oil tank and an iron core structural member, thereby avoiding local overheating. In addition, the end magnetic shield is divided into two parts, so that more leakage flux can be shielded by smaller volume.

Example 3:

this embodiment provides a three-phase three-column transformer, including two iron core side columns and an iron core center pillar, wherein, A looks iron core side column and C looks iron core side column are located the both sides of B looks iron core center pillar respectively, three-phase three-column transformer still includes the magnetism shielding structure according to this embodiment 1, magnetism shielding structure is located and is in on A looks iron core side column and the C looks iron core side column to magnetism shielding structure locates the upper portion and the lower part of A looks iron core side column and C looks iron core side column.

The device of the present invention is not limited to the embodiments of the specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solution of the present invention, which also belongs to the technical innovation scope of the present invention.

Claims

1. The magnetic shielding structure is characterized by comprising an end magnetic shielding (1) and an iron yoke cushion block (2), wherein the iron yoke cushion block (2) is positioned on the outer side of an iron core side column (7), a magnetic shielding groove is formed in the iron yoke cushion block (2), and the end magnetic shielding (1) is arranged in the magnetic shielding groove;

the end magnetic shield (1) has a shape arranged around the core side column (7) on a side close to the core side column (7) in the first direction, and is spaced apart from the core side column (7);

the end magnetic shield (1) includes a first portion (1a) and a second portion (1b) spaced apart from each other in a second direction perpendicular to the first direction, and the first portion (1a) and the second portion (1b) are symmetrically arranged with respect to a center line of the core side column (7) in the first direction;

the end magnetic shielding device is characterized in that the end magnetic shielding (1) is formed by stacking rectangular silicon steel sheets with different sizes in the second direction, the second direction is consistent with the lamination direction of the iron core side column (7), and the end magnetic shielding is in a step shape on one side close to the iron core side column in the first direction.

2. Magnetic shield structure according to claim 1, characterized in that it further comprises an insulating plate (5), the end magnetic shield (1) being fixed inside the yoke spacer (2) by means of the insulating plate (5).

3. Magnetic shield structure according to claim 1, characterized in that it further comprises a grounding plate (6),

and two ends of the grounding sheet (6) are respectively connected with the end magnetic shield (1) and the transformer clamping piece.

4. Magnetic shield structure according to claim 2, characterized in that the magnetic shield structure further comprises oil duct spacers (3) and oil duct padding plates (4), the oil duct spacers (3) and the oil duct padding plates (4) being located in the space between the end magnetic shield (1) and the insulating plate (5), and the oil duct spacers (3) being located between the end magnetic shield (1) and the oil duct padding plates (4).

5. A three-phase three-column transformer comprising two core side columns and a core center column, the two core side columns being located on either side of the core center column, respectively, characterized in that the transformer further comprises a magnetic shield structure according to any one of claims 1-4,

the magnetic shielding structure is arranged on the iron core side column.

6. The three-phase three-column transformer according to claim 5, wherein the magnetic shielding structures are provided at upper and lower portions of the core leg.