CN213877771U - Iron core insulation structure of dry type transformer - Google Patents

Abstract

The utility model relates to an iron core insulation structure of a dry type transformer, which comprises a first clamping piece insulation and a pulling plate insulation, wherein the pulling plate insulation comprises a first connecting section and a second connecting section which are connected in front and back, and a gap is formed between the inner side wall of the first connecting section close to the iron core and the top wall of the second connecting section; the second clamping piece insulator extends leftwards and rightwards and is arranged between the first clamping piece insulator and the iron core, and meanwhile, the part of the second clamping piece insulator is vertically accommodated in the gap of the pulling plate insulator; and under the state that the iron core is clamped by the clamping piece, the first clamping piece insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back, and meanwhile, the first connecting section of the pulling plate insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back. The clamping piece and the iron core are insulated and separated by the first clamping piece and the pulling plate, the clamping piece and the iron core are not conducted due to condensation, the insulating capability of the iron core to the ground is greatly improved, and at the moment, the insulating capability can reach 1000M omega and the multipoint grounding is not easy to realize.

Description

Iron core insulation structure of dry type transformer

Technical Field

The utility model relates to a transformer technical field, concretely relates to dry-type transformer's insulation system unshakable in one's determination.

Background

The dry type transformer refers to a transformer in which the core and the winding are not immersed in insulating oil.

In the prior art, the core insulation structure of the dry-type transformer generally includes a core, a clip insulation, a pulling plate insulation, and the like. The iron core insulation of the dry-type transformer is mainly realized by pulling plate insulation, clamping piece insulation and the like. For example, fig. 1 shows an insulation structure of a dry type transformer of the prior art, which is also insulated by a pulling plate insulation and a clamping piece insulation, and has a simple structure.

However, the insulation structure of the dry-type transformer has the following problems: firstly, a gap is reserved between the clamp insulation and the pull plate insulation, so that the clamp and the iron core can be conducted under the condition of condensation, and the insulation capability of the iron core to the ground is poor and is about less than or equal to 200M omega; and secondly, the insulation of the clamping piece and the insulation of the pulling plate do not protect the sharp corner of the iron core in place, so that the conduction between the iron core and the clamping piece is easily caused, and the multipoint grounding is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem to provide an insulating structure unshakable in one's determination of better dry-type transformer of insulating effect to prior art's current situation.

The utility model aims to solve the second technical problem that a dry-type transformer's insulation system unshakable in one's determination that can protect closed angle to unshakable in one's determination is provided.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: an iron core insulation structure of a dry type transformer comprises

The first clamping piece is insulated, extends left and right and is arranged between the clamping piece and the iron core; and

the pull plate is insulated, vertically extends and is arranged between the pull plate and the iron core;

the method is characterized in that:

the pull plate insulation comprises a first connecting section and a second connecting section which are connected in a front-back mode, the first connecting section extends vertically and is close to the pull plate, the second connecting section is arranged in the middle of the first connecting section and is close to the iron core, and a gap is formed between the inner side wall of the first connecting section, which is close to the iron core, and the top wall of the second connecting section; also comprises

The second clamping piece is insulated, extends leftwards and rightwards and is arranged between the first clamping piece and the iron core, and meanwhile, the insulated part of the second clamping piece is vertically accommodated in the gap of the pulling plate.

And under the state that the iron core is clamped by the clamping piece, the first clamping piece insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back, and meanwhile, the first connecting section of the pulling plate insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back.

For further solving the second technical problem of the present invention, the adopted technical solution is: the iron core comprises an end iron yoke formed by stacking a plurality of silicon steel sheets front and back, and the end iron yoke is provided with a first silicon steel sheet with the minimum height;

the second clamping piece insulation vertically covers the first silicon steel sheet, and the height of the second clamping piece insulation is larger than that of the first silicon steel sheet.

Because the insulating height of second folder is greater than the height of first silicon steel sheet, the foreign matter acts on the second folder is insulating easily like this, and first silicon steel sheet then is difficult to touch its closed angle and lead to the closed angle to be buckled by the foreign matter, and the closed angle of buckling is touched easily with the folder and lead to multiple spot ground connection, consequently, this scheme can not be buckled because the closed angle to play the effect of protection iron core closed angle.

In order to protect the end iron yoke of the iron core, the iron core comprises the end iron yoke formed by stacking a plurality of silicon steel sheets front and back, and the end iron yoke is provided with a second silicon steel sheet with the smallest left-right length;

the second clamping piece insulation covers the second silicon steel sheet along the left-right direction, and the left-right length of the second clamping piece insulation is larger than that of the second silicon steel sheet.

Length is greater than the length about this second silicon steel sheet about through the insulating length of controlling of second folder, and the foreign matter acts on the insulating left and right sides of second folder easily like this, and the left and right sides of second silicon steel sheet then is difficult to be met by the foreign matter and leads to its closed angle to be buckled, and the closed angle of buckling is met with the folder easily and leads to multiple spot ground connection, consequently, this scheme can not be buckled because the closed angle to play the effect of the tip yoke of protection iron core.

In order to protect the iron core column of the iron core, the iron core comprises the iron core column formed by stacking a plurality of silicon steel sheets front and back, and the iron core column is provided with a third silicon steel sheet with the smallest left-right width;

the second connecting section of the pull plate insulation covers the third silicon steel sheet along the left-right direction, and the left-right width of the second connecting section is larger than that of the third silicon steel sheet.

The left-right width of the second connecting section is larger than that of the third silicon steel sheet. The foreign matter acts on the left and right sides of the insulating second linkage segment of arm-tie easily like this, and the left and right sides of third silicon steel sheet then is difficult to be touched its closed angle by the foreign matter and leads to the closed angle to be buckled, and the closed angle of buckling is touched easily with the folder and leads to multiple spot ground connection, therefore, this scheme can not be buckled thereby play the effect of the iron-cored column of protection iron core because the closed angle.

The mounting structure of the insulating pull plate can be various, and preferably, the first connecting section and the first connecting section of the insulating pull plate are adhered or clamped with each other for the convenience of assembly.

The mounting structure of the first clamp insulator and the second clamp insulator can be various, and preferably, the first clamp insulator and the second clamp insulator are adhered or clamped with each other for convenience of assembly.

In order to clamp the iron core, the iron core clamping device further comprises a bolt which penetrates through the first clamping piece insulator, the second clamping piece insulator, the iron core and the clamping pieces in a front-back mode. Therefore, the parts are tightly attached front and back, the insulativity is high, the stress of the iron core is uniform, and the noise is low.

In order to stabilize the structure and improve the strength, the pulling plate insulator, the first clamping piece insulator and the second clamping piece insulator are all in a plate shape.

In order to enable the second connecting section of the pulling plate insulator, the second clamping piece insulator and the iron core to be tightly attached, the front-back width of the second connecting section of the pulling plate insulator is approximately equal to the front-back width of the second clamping piece insulator. Therefore, when the iron core is clamped, the second connecting section of the pulling plate, the second clamping piece and the iron core can be tightly attached without gaps, and the insulating capability of the iron core to the ground is improved.

In order to improve the insulation of the iron core, the sum of the front and back widths of the first clamping piece insulation and the second clamping piece insulation is approximately equal to the sum of the front and back widths of the pulling plate, the first connecting section of the pulling plate insulation and the second connecting section of the pulling plate insulation;

or/and the first clamping piece insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back in a state that the clamping pieces clamp the iron core, and meanwhile, the first connecting section of the pulling plate insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back.

Therefore, the distance between the iron core and the clamping piece is equal in the left position and the right position, after the iron core is clamped tightly, the iron core can be tightly attached to the second clamping piece in an insulating mode and the pull plate in an insulating mode, the clamping piece is tightly attached to the first clamping piece in an insulating mode, the pull plate can be tightly attached to the pull plate in an insulating mode and the second clamping piece in an insulating mode, gaps are few, and the insulating performance is high.

Or/and the first clamping piece insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back, and the first connecting section of the pulling plate insulator, the second clamping piece insulator and the iron core are sequentially attached from front to back, so that the parts are tightly attached, and the insulating capability can be improved

Compared with the prior art, the utility model has the advantages that: through set up the breach and set up the second folder is insulating on the arm-tie is insulating, like this, first folder is insulating to link to each other with the second folder is insulating, link to each other through the second folder is insulating between first folder is insulating and the arm-tie is insulating, folder and iron core are because by first folder insulating, the second folder is insulating and the arm-tie is insulating to be separated, so can not switch on because of the condensation between folder and the iron core, the insulating ability of iron core to ground will promote by a wide margin like this, at this moment, insulating ability can reach 1000M omega and be difficult to cause multiple spot ground connection.

Drawings

Fig. 1 shows a core insulation structure of a dry type transformer in the related art.

Fig. 2 is a perspective view of the present invention;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a left-right view of FIG. 2;

FIG. 6 is an enlarged view of portion B of FIG. 5;

fig. 7 is an assembly view of a second silicon steel sheet, a second clip insulator, a clip, a third silicon steel sheet, etc.;

FIG. 8 is a transverse cross-sectional view of FIG. 2;

fig. 9 is an assembly view of the clip, the second clip insulator, the pull plate insulator, etc. according to an embodiment of the present invention;

FIG. 10 is the view of FIG. 9 with the second clamp insulator removed;

FIG. 11 is a schematic view from another angle of FIG. 9;

FIG. 12 is a schematic view of FIG. 11 with the clip removed;

fig. 13 is a perspective view of the second clip member according to the embodiment of the present invention;

FIG. 14 is an assembly view of the first pull plate insulator and the second pull plate insulator;

fig. 15 is an exploded view of fig. 14.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Fig. 1 is a schematic view of a core insulation structure of a dry type transformer of the related art. The iron core insulation structure comprises a clamping piece insulation 10, a pulling plate insulation 30, a clamping piece 40, an iron core 50, a pulling plate 60, a bolt 70 and the like, wherein a gap is formed between the clamping piece insulation 10 and the pulling plate insulation 30.

As shown in fig. 2 to 15, the dry-type transformer of the present invention has an iron core insulation structure.

The iron core insulation structure of the dry type transformer comprises a first clamping piece insulation 1, a second clamping piece insulation 2, a pulling plate insulation 3, a clamping piece 4, an iron core 5, a pulling plate 6, a bolt 7 and the like.

The first clip insulator 1 extends in a left-right direction and is plate-shaped, and is disposed between the clip 4 and the core 5.

The thickness of the first clip insulator 1 in the front-rear direction may be 7 mm.

The left-right length of the first clip insulator 1 may be slightly smaller than the distance between the minimum sheet widths of the two core legs 5b, for example, may be-20 mm.

The height of the first clamping piece insulator 1 may be that the top of the first clamping piece insulator 1 is slightly higher than the first silicon steel sheet 51, for example, the height of the first silicon steel sheet 51 +20 mm.

The tie plate insulator 3 extends vertically and is plate-shaped, and is disposed between the tie plate 6 and the core 5. The pulling plate insulation 3 comprises a first connecting section 31 and a second connecting section 32 which are connected in a front-back mode, the first connecting section 31 extends vertically and is close to the pulling plate 6, the second connecting section 32 is arranged in the middle of the first connecting section 31 and is close to the iron core 5, and a gap 3a is formed between the inner side wall of the iron core 5 and the top wall of the second connecting section 32 of the first connecting section 31. In this embodiment, the first connecting section 31 and the first connecting section 31 of the pull plate insulator 3 are adhered to each other, but in other embodiments, they may be clamped. Because the notch 3a of the pull plate insulation 3 is small, the pull plate insulation 3 is inconvenient to obtain after the notch 3a is cut off through an integrated piece, and the first connecting section 31 and the second connecting section 32 are relatively long in length, so that the connection of the first connecting section and the second connecting section is more convenient than the cutting off of the notch 3 a. The thicknesses of the first connecting section 31 and the second connecting section 32 of the insulating part 3 of the pulling plate in the front-back direction are both 1mm, that is, the thickness of the second connecting section 32 in the front-back direction is equal to the thickness of the second clamping piece insulating part 2 in the front-back direction.

The left and right length of the first connection section 31 of the pull plate insulator 3 may be greater than the left and right length of the third silicon steel sheet 53, and the left and right length of the first connection section 31 may be adjusted as required, for example, may be 80mm, 100mm or 120 mm.

The thickness of the first connecting section 31 of the pulling plate insulator 3 in the front-rear direction is 1mm,

the height of the first connecting section 31 of the pull plate insulator 3 may be set according to the requirement, and may be, for example, the core window height H (see fig. 9) + the highest silicon steel sheet height of the end iron yoke 5a + the height of the clip insulator 2.

The left and right length of the second connection section 32 of the pull plate insulator 3 is greater than the left and right length of the third silicon steel sheet 53, and the left and right length of the second connection section 32 can be adjusted as required, for example, can be 80mm, 100mm or 120 mm. In the prior art, the size of the pull plate insulator 3 is equal to the corresponding size of the third silicon steel sheet 53, so that the pull plate insulator 3 can only be applied to the third silicon steel sheet 53 but not to other silicon steel sheets. In the embodiment, the left-right length of the second connecting section 32 of the pull plate insulation 3 is greater than the left-right length of the third silicon steel sheet 53, so that the pull plate insulation 3 can be suitable for silicon steel sheets with different left-right lengths, and the universality of the pull plate insulation 3 is wider.

The second connection section 32 of the tab insulator 3 may have a thickness of 1mm in the front-rear direction,

the height of the second connecting section 32 of the pull plate insulator 3 can be set according to requirements, for example, the height of the highest silicon steel sheet of the iron yoke at the end of the iron core window height H + to the height of the second clamping piece insulator 2 is-5 mm. Thus, the bottom of the second clamping piece insulator 2 is spaced from the top of the second connecting section 32 of the pulling plate insulator 3, which requires less mounting accuracy.

The second clip insulator 2 extends left and right and is plate-shaped, and is disposed between the first clip insulator 1 and the core 5, while a part of the second clip insulator 2 is vertically accommodated in the notch 3a of the tab insulator 3.

The thickness of the second clamping piece insulator 2 in the front-back direction is 1 mm. In the present embodiment, the first clip insulator 1 and the second clip insulator 2 are adhered to each other to form the clip insulator structure of the present embodiment, but in other embodiments, the two can be clamped.

The left-right length of the second clip insulator 2, the second clip insulator 2 may cover the second silicon steel sheet 52 along the left-right direction, and the left-right length of the second clip insulator 2 is greater than the left-right length of the second silicon steel sheet 52, specifically, may be +40mm of the left-right length of the second silicon steel sheet 52.

The thickness of the second clip insulator 2 in the front-rear direction may be 1mm,

the height of the second clamping piece insulator 2 may be +20mm of the height of the second silicon steel sheet 52.

The clip 4 has 4 pieces including 2 upper clip pieces and 2 lower clip pieces. In this embodiment, the above clip mainly indicates the matching relationship with other parts. Under the state that the iron core 5 is clamped by the clamping piece 4, the first clamping piece insulator 1, the second clamping piece insulator 2 and the iron core 5 are sequentially attached from front to back, and meanwhile, the first connecting section 31 of the pulling plate insulator 3, the second clamping piece insulator 2 and the iron core 5 are also sequentially attached from front to back.

The iron core 5 comprises an end iron yoke 5a formed by stacking a plurality of silicon steel sheets back and forth, wherein the end iron yoke 5a is provided with a first silicon steel sheet 51 with the smallest height; the second clamping insulator 2 vertically covers the first silicon steel sheet 51, and the height of the second clamping insulator 2 is greater than that of the first silicon steel sheet 51. The end iron yoke 5a includes an upper iron yoke and a lower iron yoke, and in the present embodiment, only the fitting relationship of the upper iron yoke with the first connecting section is shown, and the fitting relationship of the lower iron yoke with the first connecting section is not shown.

The end iron yoke 5a has a second silicon steel sheet 52 with the smallest left-right length; the second clip insulator 2 covers the second silicon steel sheet 52 along the left-right direction, and the left-right length of the second clip insulator 2 is greater than the left-right length of the second silicon steel sheet 52. In this embodiment, the second silicon steel sheet 52 and the first silicon steel sheet 51 are the same silicon steel sheet.

The iron core 5 comprises an iron core column 5b formed by stacking a plurality of silicon steel sheets front and back, and the iron core column 5b is provided with a third silicon steel sheet 53 with the smallest left-right width; the second connection section 32 of the pull plate insulation 3 covers the third silicon steel sheet 53 in the left-right direction, and the left-right width of the second connection section 32 is greater than the left-right width of the third silicon steel sheet 53.

The bolt 7 is used for penetrating the first clamping piece insulator 1, the second clamping piece insulator 2, the iron core 5 and the clamping piece 4 in front and back. The first clamping piece insulators 1 are connected with the second clamping piece insulators 2, so that the two first clamping piece insulators 1 are relatively fixed and cannot easily rotate around the bolts 7, the second clamping piece insulators 2 are easily clamped by the clamping pieces 4, the stress of the iron core 5 is uniform, the sealing performance is good, the insulating performance is high, and the noise is low. The second clamping piece insulator 2 in the prior art of fig. 1 is easy to rotate around the bolt 7 because of no effect of the first clamping piece insulator 1, so that after the clamping piece 4 is clamped, the iron core 5 is easy to be stressed unevenly, and gaps can be formed to influence the insulation.

For tight fitting, the front-to-back width of the second connecting section 32 of the pull plate insulator 3 is substantially equal to the front-to-back width of the second clip insulator 2. The sum of the front-rear widths of the first clip insulator 1 and the second clip insulator 2 is substantially equal to the sum of the front-rear widths of the pull plate 6, the first connection section 31 of the pull plate insulator 3, and the second connection section 32 of the pull plate insulator 3.

The core insulation structure of the dry-type transformer of the present embodiment has the following operation principle and operation process.

When the second clamping piece insulator 2 is installed, the second clamping piece insulator 2 is accommodated at the notch 3a of the pulling plate insulator 3. Under the state that the iron core 5 is clamped by the clamping piece 4, the first clamping piece insulator 1, the second clamping piece insulator 2 and the iron core 5 are sequentially attached from front to back, and meanwhile, the first connecting section 31 of the pulling plate insulator 3, the second clamping piece insulator 2 and the iron core 5 are also sequentially attached from front to back.

Because the first clamping piece insulator 1 is connected with the pulling plate insulator 3 through the second clamping piece insulator 2, no gap exists between the first clamping piece insulator 1 and the pulling plate insulator 3, as in the prior art, the influence of condensation is not easily caused, and the insulating capability of the iron core 5 to the ground is greatly improved.

The height of the second clamping piece insulator 2 is greater than that of the first silicon steel sheet 51, the left-right length of the second clamping piece insulator 2 is greater than that of the second silicon steel sheet 52, and the left-right width of the second connecting section 32 is greater than that of the third silicon steel sheet 53, so that the closed angle of the end iron yoke 5a of the iron core 5, the closed angle of the end iron yoke 5a and the left side and the right side of the iron core column 5b are respectively protected, and the universality of the second clamping piece insulator 2 and the second connecting section 32 is also improved. The provision of the second clip insulator 2 and the tab insulator 3 also facilitates the protection of the clip 4.

Claims (10)

1. An iron core insulation structure of a dry type transformer comprises

The first clamping piece insulator (1) extends leftwards and rightwards and is arranged between the clamping piece (4) and the iron core (5); and

the pull plate insulation (3) extends vertically and is arranged between the pull plate (6) and the iron core (5);

the method is characterized in that:

the pull plate insulation (3) comprises a first connecting section (31) and a second connecting section (32) which are connected in a front-back mode, the first connecting section (31) vertically extends and is close to the pull plate (6), the second connecting section (32) is arranged in the middle of the first connecting section (31) and is close to the iron core (5), and a gap (3a) is formed between the inner side wall of the first connecting section (31) close to the iron core (5) and the top wall of the second connecting section (32); also comprises

The second clamping piece insulator (2) extends leftwards and rightwards and is arranged between the first clamping piece insulator (1) and the iron core (5), and meanwhile, the part of the second clamping piece insulator (2) is vertically accommodated in the notch (3a) of the pulling plate insulator (3).

2. A core insulation structure as recited in claim 1, wherein: the iron core (5) comprises an end iron yoke (5a) formed by stacking a plurality of silicon steel sheets front and back, and the first silicon steel sheet (51) with the smallest height is arranged in the end iron yoke (5 a);

the second clamping piece insulator (2) vertically covers the first silicon steel sheet (51), and the height of the second clamping piece insulator (2) is larger than that of the first silicon steel sheet (51).

3. A core insulation structure as recited in claim 1, wherein: the iron core (5) comprises an end iron yoke (5a) formed by stacking a plurality of silicon steel sheets front and back, and a second silicon steel sheet (52) with the smallest left-right length is arranged in the end iron yoke (5 a);

the second clamping piece insulation (2) covers the second silicon steel sheet (52) along the left-right direction, and the left-right length of the second clamping piece insulation (2) is larger than the left-right length of the second silicon steel sheet (52).

4. A core insulation structure as recited in claim 1, wherein: the iron core (5) comprises an iron core column (5b) formed by stacking a plurality of silicon steel sheets front and back, and the iron core column (5b) is provided with a third silicon steel sheet (53) with the smallest left-right width;

the second connecting section (32) of the pull plate insulation (3) covers the third silicon steel sheet (53) along the left-right direction, and the left-right width of the second connecting section (32) is larger than that of the third silicon steel sheet (53).

5. A core insulation structure as recited in any one of claims 1 through 4, wherein: and the first connecting section (31) of the pull plate insulation (3) are mutually bonded or clamped.

6. A core insulation structure as recited in any one of claims 1 through 4, wherein: the first clamping piece insulator (1) and the second clamping piece insulator (2) are mutually bonded or clamped.

7. A core insulation structure as recited in any one of claims 1 through 4, wherein: the clamping device also comprises a bolt (7) which is used for penetrating through the first clamping piece insulator (1), the second clamping piece insulator (2), the iron core (5) and the clamping piece (4) in a front-back mode.

8. A core insulation structure as recited in any one of claims 1 through 4, wherein: the pulling plate insulator (3), the first clamping piece insulator (1) and the second clamping piece insulator (2) are all plate-shaped.

9. A core insulation structure as recited in claim 8, wherein: the front-back width of the second connecting section (32) of the pulling plate insulator (3) is approximately equal to the front-back width of the second clamping piece insulator (2).

10. A core insulation structure as recited in any one of claims 1 through 4, wherein: the sum of the front and back widths of the first clamping piece insulator (1) and the second clamping piece insulator (2) is approximately equal to the sum of the front and back widths of the pull plate (6), the first connecting section (31) of the pull plate insulator (3) and the second connecting section (32) of the pull plate insulator (3);

or/and when the iron core (5) is clamped by the clamping piece (4), the first clamping piece insulator (1), the second clamping piece insulator (2) and the iron core (5) are sequentially attached from front to back, and meanwhile, the first connecting section (31) of the pulling plate insulator (3), the second clamping piece insulator (2) and the iron core (5) are sequentially attached from front to back.

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