CN103021639B - The combined insulation cushion block of dry-type transformer - Google Patents
The combined insulation cushion block of dry-type transformer Download PDFInfo
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- CN103021639B CN103021639B CN201110300004.8A CN201110300004A CN103021639B CN 103021639 B CN103021639 B CN 103021639B CN 201110300004 A CN201110300004 A CN 201110300004A CN 103021639 B CN103021639 B CN 103021639B
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- top board
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- cushion block
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Abstract
The invention discloses a kind of combined insulation cushion block of dry-type transformer, described combined insulation cushion block is rectangular-shaped, it is characterized in that, this combined insulation cushion block comprises a top board and a pedestal, described top board and pedestal are plugged in together, or, between described top board and pedestal, add at least one chipware further.Solve cross-over block of the prior art needs a large amount of different size cushion block because of product specification change, produce the problem that die cost increases, the production cycle is long thus.There is combined and instant, be suitable for the demand of products of different specifications to the cross-over block of different size, can effectively reduce die cost and shorten the production cycle.
Description
Technical field
The present invention relates to a kind of cross-over block of transformer, particularly relate to a kind of combined insulation cushion block of dry-type transformer.
Background technology
The end winding of transformer especially end outlet time, electric field strength is higher.The distance of gripping to iron is that coil-span is from 2-3 times.Basic end insulating part is core insulation.In the Main Insulation Structure of Electric of usual dry-type transformer, upper yoke insulation and lower yoke insulation form by cross-over block.This cross-over block is made up of unsaturated-resin glass fiber reinforcement BMC, and its shape is cuboid collets, and there is an oblique angle one end by iron yoke place, is suitable for O shaped iron core structure, is placed on inside coil by iron yoke position herein.Collets are distributed in the both sides of transformer coil upper end and the both sides of lower end.Collets are generally arranged on dry-type transformer body two ends, as a part for main insulation.Namely every phase coil has four cushion blocks evenly to place up and down.The thickness of cushion block is determined by the electric pressure of transformer and capacity.Voltage raises or capacity strengthens, and pad thickness is corresponding to be increased, the corresponding increasing of volume.The insulation costs of transformer accounts for whole transformer cost significant proportion.It is high that existing dry-type transformer has relative cost, the problem that electric strength is low.
For solving the problems of the technologies described above, ZL200620148079.3 utility model patent discloses a kind of umbrella shape cross-over block of dry-type transformer, this umbrella shape cross-over block is the cuboid collets having an oblique angle by iron yoke end, and its special feature is that collets side surrounding is shaped with the equal-sized groove of multiple tracks along short transverse.It is installation in order to be suitable for O shaped iron core structure that cushion block is provided with oblique angle by iron yoke end.All stagger between the groove and groove at cushion block oblique angle place.The introducing of groove significantly increases coil creepage distance over the ground, greatly strengthen the anti-short circuit capability of its electric strength and transformer.Its electric strength strengthening himself under the prerequisite not increasing height, namely strengthens coil creepage distance over the ground.But this umbrella shape cross-over block is overall structure, be formed by fixed mould hot pressing, because the dimensions of transformer is different, the size difference (length and thickness all change) of required cushion block, then need a large amount of moulds during making, die cost is more.Particularly the product required size (length and thickness all change) of special transformer is different, and must make different pad moulds according to order requirements size, fabrication cycle is longer.Therefore, a kind ofly can save production mould, reduce the cross-over block of fabrication cycle and become the target that those skilled in the art pursue.
Summary of the invention
The object of the invention is to solve cross-over block of the prior art needs a large amount of different size cushion block because product specification change, produce the problem that die cost increases, the production cycle is long thus.
For solving the problems of the technologies described above, the present invention is by cross-over block is designed to a set of Combined bearing block, by different compound modes to meet the needs of products of different specifications.Thus die cost can be saved in a large number, and shorten fabrication cycle widely.
The combined insulation cushion block of a kind of dry-type transformer of the present invention, described combined insulation cushion block is rectangular-shaped, it is characterized in that, this combined insulation cushion block comprises a top board and a pedestal, and described top board and pedestal are plugged in together.
As preferably, the bottom surface of described top board has recessed seam, described pedestal there is the male half coupling coordinating grafting with the recessed seam of described top board above.Described pedestal and top board are plugged in together easily by convex-concave seam, also separating and making up again easily.
In order to increase coil creepage distance over the ground, be provided with annular groove in the described surrounding side by the cross-over block of top board and base combination along short transverse.
As preferably, under the surrounding of described top board side edge and described pedestal surrounding on along respectively there is the chamfering that cross section is concave arc shape, form described annular groove at the faying face place of cross-over block after described top board and described pedestal fasten.Annular groove is located on the faying face of top board and pedestal, is conducive to mold releasability.
The present invention also provides a kind of combined insulation cushion block of dry-type transformer, described combined insulation cushion block is rectangular-shaped, it is characterized in that, this combined insulation cushion block comprises a top board, at least one chipware and a pedestal, and described top board, at least one chipware and pedestal are plugged in together.
As preferably, the bottom surface of described top board has recessed seam, described pedestal there is male half coupling above, described chipware above and be respectively equipped with male half coupling and recessed seam below; Male half coupling above described chipware coordinates with the recessed seam of described top board or chipware described in another, and the recessed seam below described chipware coordinates with the male half coupling of described pedestal or another chipware.Adopt the convenient combination of convex-concave seam grafting between top board, chipware, pedestal and split.
In order to increase coil creepage distance over the ground, be provided with at least two annular grooves in the described surrounding side by the cross-over block of a top board, at least one chipware, a base combination along short transverse.
As preferably, along having the chamfering that cross section is concave arc shape under the surrounding of described top board side, on described chipware surrounding side, edge and lower edge have the chamfering that cross section is concave arc shape respectively, along having the chamfering that cross section is concave arc shape in the surrounding of described pedestal, described top board, chipware, pedestal form described annular groove at faying face place after fastening.Annular groove is located at the faying face place between two pieces, is beneficial to mold releasability.
As preferably, the circumferential lateral surface between two upper and lower concave arc shape chamferings of described chipware forms a bulge loop.
As preferably, described chipware surrounding side is provided with at least two annular grooves along short transverse, and is a bulge loop between described adjacent annular groove; Circumferential lateral surface between two upper and lower concave arc shape chamferings of described chipware and adjacent described annular groove forms two bulge loops.
Select the chipware of a bulge loop to be suitable for adjusting cross-over block height more flexibly, conveniently, select the chipware of 3 bulge loops to be suitable for higher cross-over block.
As preferably, the shape of the top board of described cross-over block, pedestal and chipware is Long Circle or ellipse.The both sides of cross-over block are semicircle, make it rounder and more smooth, avoid the appearance of wedge angle, improve electric property; Mold Making can be made relatively simple, and elegant in appearance.
As preferably, recessed seam and the male half coupling of the recessed seam of the top board of described cross-over block, the male half coupling of described pedestal, described chipware are Long Circle.
In order to make to install firmly between top board, chipware, pedestal, as preferably, the medial surface of the recessed seam of described top board, the recessed seam of described chipware is respectively equipped with the double wedge or alveolus that are fitted to each other; The lateral surface of the male half coupling of described chipware, the male half coupling of described pedestal is respectively equipped with the alveolus or double wedge that coordinate with the recessed seam of described top board or the recessed seam of described chipware.
As preferably, the length of described top board is equal to or greater than the length of described pedestal, chipware.Coordinated the top board of different length by the pedestal to same specification, chipware, with the demand that applicable different product is different to cushion block length, thus the accommodation of one group of mould can be increased.
In order to make the structure of combined pad of the present invention be applicable to O shaped iron core structure, the length of described top board, chipware and pedestal increases successively, makes to form two oblique angles above the two ends of combined insulation cushion block.
The present invention is owing to adopting technique scheme, cross-over block is divided at least two parts: top board and pedestal, thus can by the height of the cross-over block required for combination formation, particularly by adding at least one chipware between top board and pedestal, reach the object of the height of adjustment cushion block further.
The present invention arranges annular recess further by the surrounding side at combined insulation cushion block, thus can increase coil creepage distance over the ground, strengthens the anti-short circuit capability of its electric strength and transformer.Particularly annular recess is located at the position of the faying face of top board and pedestal by the present invention dexterously, and the position of the faying face of top board and chipware, chipware and pedestal, is so more conducive to the demoulding of mould.
Further chipware of the present invention itself can select the chipware of differing heights, surrounding namely can be selected with the chipware of a bulge loop or multiple bulge loop, the most preferably chipware of one and three bulge loop, and the chipware of differing heights can be selected to reach design needs.
Combined insulation cushion block of the present invention is by selecting the chipware of top board, pedestal and differing heights or varying number, thus the object of the height of adjustment cross-over block can be reached, simultaneously, the top board of different length is coordinated, to reach the object of adjustment cross-over block length by the pedestal to unified specification, chipware.
The present invention is provided with the double wedge or alveolus that match each other further on the male half coupling of grafting of top board and pedestal, top board and chipware, chipware and chipware, chipware and pedestal and the mating surface of recessed seam, thus the frictional force of both combinations can be increased, both are made to be connected firmly, difficult drop-off.
Combined insulation cushion block of the present invention has easy to make, and Automatic Combined coordinates advantage closely.Meanwhile, significantly can reduce different cushion block needed for different product and consequent die cost, and shorten the construction period, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the embodiment one of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 2 A is the vertical view of the top board of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 2 B, 2C are B-B cutaway view and the C-C cutaway view of Fig. 2 A.
Fig. 2 D is the D place broken section enlarged drawing of Fig. 2 A.
Fig. 3 A is the vertical view of the pedestal of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 3 B, 3C are B-B cutaway view and the C-C cutaway view of Fig. 3 A.
Fig. 4 A, 4B, 4C are the horizontal stroke of the embodiment two of the combined insulation cushion block of dry-type transformer of the present invention, longitudinal section and vertical view.
Fig. 5 A is the vertical view of the chipware of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 5 B, 5C are B-B cutaway view and the C-C cutaway view of Fig. 5 A.
Fig. 6 is the cutaway view of the embodiment three of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 7 is the cutaway view of the embodiment four of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 8 is the cutaway view of chipware in the embodiment four of the combined insulation cushion block of dry-type transformer of the present invention.
Fig. 9 is the cutaway view of the embodiment five of the combined insulation cushion block of dry-type transformer of the present invention.
Figure 10 A, 10B are cutaway view and the vertical view of the embodiment six of the combined insulation cushion block of dry-type transformer of the present invention.
Figure 11 A, 11B are cutaway view and the vertical view of the embodiment seven of the combined insulation cushion block of dry-type transformer of the present invention.
Figure 12 A, 12B are cutaway view and the vertical view of the embodiment eight of the combined insulation cushion block of dry-type transformer of the present invention.
Embodiment
Embodiment one, see the combined insulation cushion block illustrating dry-type transformer of the present invention in Fig. 1, figure, this cross-over block is roughly in rectangular-shaped, the feature of the present embodiment is that this cross-over block is made up of a top board 1 and a pedestal 2, and top board 1 and pedestal 2 snap together; See Fig. 2 A-2C, the bottom surface of top board 1 has a recessed seam 11; See Fig. 3 A-3C, above described pedestal 2, there is one coordinates grafting male half coupling 21 with the recessed seam 11 of described top board 1; The surrounding of described cross-over block side is provided with a semicircle annular groove 3; Annular groove 3 significantly increases coil creepage distance over the ground, enhance the anti-short circuit capability of its electric strength and transformer, in the present embodiment, under the surrounding of described top board 1 side edge and described pedestal 2 surrounding on along respectively there is the chamfering 12,22 that a cross section is roughly the concave arc shape of quadrant, form a semicircular annular groove 3 at both faying face places after top board 1 and pedestal 2 fasten.The present embodiment is in order to the demoulding is easy, makes the faying face of top board 1 and pedestal 2 side be located at the middle position of semicircle annular groove 3, obviously, can be located at other positions, can reach the object strengthening coil creepage distance over the ground equally.
See Fig. 2 A-2D, 3A-3C, illustrate the concrete structure of top board 1 and pedestal 2 in the present embodiment in figure, in order to be applicable to D shaped iron core structure installment, the shape of top board 1 and pedestal 2 vertical view is the Long Circle of two ends semicircular in shape; Male half coupling 21 two ends of the recessed seam 11 below described top board 1 and pedestal 2 are also semicircular Long Circle.It is noted that Long Circle of the present invention refers to the rectangular shape (being runway shape) formed for semicircle at the two ends broadside of length direction.Simultaneously in order to be connected firmly, the mating surface of the male half coupling 21 of recessed seam 11 and pedestal 2 is respectively equipped with the alveolus or double wedge that are fitted to each other between the two.See Fig. 2 D and Fig. 3 B, be provided with the alveolus 13 of triangle in the side of recessed seam 11 correspondence, be provided with the double wedge 23 coordinated with described alveolus 13 that cross section is triangle in the side of male half coupling 21.Design like this, can make top board 1 and pedestal 2 grafting fastening, avoid depart from, certain double wedge 23 or alveolus 13 also can reversing of position arrange.
Embodiment two, see Fig. 4 A, 4B, 4C, with a upper embodiment difference is, this combined pad comprises top board 1, chipware 4, pedestal 2.Described chipware 4 is located between top board 1 and pedestal 2, and top board 1, chipware 4 and pedestal 2 are plugged in together.Wherein the structure of chipware 4 is shown in Fig. 5 A-5C, is provided with the male half coupling 41 for recessed seam 11 grafting with described top board 1 bottom surface on described chipware 4, is provided with the recessed seam 42 for receiving male half coupling 21 above described pedestal 2 below chipware 4; The bulge loop 43 of to be a cross section in the centre position, surrounding side of chipware 4 be semicircle shape, and on described chipware 4 surrounding side edge and lower edge and described bulge loop 43 adjacent be the chamfering 44 that a cross section is roughly the concave arc shape of quadrant, become two semicircular annular grooves 3 after the chamfering 12,22 of this upper and lower chamfering 44 and described top board 1 and pedestal 2 fastens.Equally, the double wedge 45 or alveolus 46 that coordinate with the alveolus 13 of top board 1 and the double wedge 23 of pedestal 2 is respectively equipped with at the male half coupling 41 of chipware 4 and the side of recessed seam 42.
Embodiment three, see Fig. 6, with above-described embodiment difference be: this combined insulation cushion block comprises top board 1, pedestal 2 and two chipwares 4, top board 1, chipware 4, chipware 4, pedestal 2 are plugged in together successively from top to bottom, the male half coupling 41 of chipware 4 and recessed seam 42 are because coordinating with top board 1 and pedestal 2, also can coordinate with itself, namely the recessed seam 42 of a chipware 4 can coordinate with the male half coupling 41 of another chipware 4, thus increases the height of cross-over block.Wherein form 3 semicircle annular grooves 3 between top board 1 and chipware 4, between chipware 4 and chipware 4, between chipware 4 and pedestal 2 at faying face place.
Embodiment four, see Fig. 7, chipware with embodiment two difference, see Fig. 8, the chipware 4 ' in the present embodiment is illustrated in figure, it is semicircular annular groove 3 that the surrounding side of this chipware 4 ' is provided with 2 cross sections along short transverse, and on described chipware 4 ' surrounding side, edge and lower edge have the chamfering 44 that cross section is concave arc shape respectively, form 3 cross sections and be roughly semicircular bulge loop 43 between wherein adjacent annular groove 3 and between annular groove 3 and chamfering 44; Male half coupling 41 above chipware 4 ' in the present embodiment coordinates (Fig. 2 B shows) with the recessed seam 11 of described top board 1, and the recessed seam 42 below described chipware 4 ' coordinates (Fig. 3 B shows) with described pedestal 2 male half coupling 21; Become upper and lower two semicircle annular grooves 3 after the chamfering 12,22 (Fig. 2 B, Fig. 3 B show) of the upper and lower chamfering of this chipware 4 ' 44 and described top board 1 and pedestal 2 fastens, therefore form 4 semicircle annular grooves 3 in the surrounding of cross-over block.
Embodiment five, see Fig. 9, with a upper embodiment difference is: it comprises two chipwares, 4, chipware is the chipware 4 ' with three bulge loops 43 shown in Fig. 8; Another has the chipware 4 of a bulge loop 43 for the surrounding shown in Fig. 5 A-5C, forms 5 semicircle annular grooves 3 after top board 1, chipware 4, chipware 4 ' and pedestal 2 combine in the surrounding of cross-over block.
Embodiment six, see Figure 10 A, 10B, the present embodiment and embodiment two difference are: wherein the length of top board 1 is longer than the length of pedestal 2, chipware 4.This design is that top board 1 is designed to several specification of multiple different length, the length of pedestal 2 and chipware 4 is fixed length, the top board 1 of different size is to be applicable to pedestal 1 or the chipware 4 of same width, use same chipware 4 and pedestal 2 can adapt to the top board 1 of obstructed length, thus the utilization rate of same chipware 4 and pedestal 2 is improved, accommodation increases, and reduces die needed quantity.
Embodiment seven, see Figure 11 A, 11B, the present embodiment and embodiment two difference are: the outer contour shape of described pedestal 2, top board 1, chipware 4 all changes ellipse into from Long Circle.
Embodiment eight, see 12A, 12B, the present embodiment and embodiment two difference are: be suitable for O shaped iron core structure to make cross-over block of the present invention, there are above the two ends of described cross-over block two oblique angles 5 respectively, therefore described in be placed in combined insulation cushion block pedestal 2 above chipware 4 and the length of top board 1 reduce successively, and the width of its each parts is consistent, namely the length of chipware 4 is less than the length of pedestal 2, the length of top board 1 is less than the length of chipware 4, thus forms two oblique angles 5 on the two ends of combined insulation cushion block.
Above embodiment carries out exemplary illustration to the present invention, but not the summary of being restricted property, the present invention aims to provide a kind of combined insulation cushion block, this combined insulation cushion block at least comprises the top board and a pedestal that are plugged in together, also can increase chipware between the two, by not selecting chipware or selecting different chipwares, the object of the height of adjustment cross-over block can be reached, simultaneously by selecting the top board of different length, to reach the object of the length of adjustment cross-over block.Those of ordinary skill in the art, under the guidance of inventive concept of the present invention, can also make the amendment on a lot of conventional structure and replacement, such as: the quantity changing chipware, or the height changing chipware itself.These amendments also should be considered to belong among protection scope of the present invention with replacement.
Claims (11)
1. the combined insulation cushion block of a dry-type transformer, described combined insulation cushion block is rectangular-shaped, it is characterized in that, this combined insulation cushion block comprises a top board, at least one chipware and a pedestal, and described top board, at least one chipware and pedestal are plugged in together; The bottom surface of described top board has recessed seam, described pedestal above there is male half coupling, described chipware above and be respectively equipped with male half coupling and recessed seam below; Male half coupling above described chipware coordinates with the recessed seam of described top board or chipware described in another, and the recessed seam below described chipware coordinates with the male half coupling of described pedestal or another chipware; The lateral surface of the male half coupling of described chipware, the male half coupling of described pedestal is respectively equipped with the alveolus or double wedge that coordinate with several double wedge of the recessed seam medial surface of the recessed seam of described top board or described chipware or alveolus.
2. the combined insulation cushion block of dry-type transformer according to claim 1, is characterized in that: be provided with at least two annular grooves in the described surrounding side by the cross-over block of a top board, at least one chipware, a base combination along short transverse.
3. the combined insulation cushion block of dry-type transformer according to claim 2, it is characterized in that: along having the chamfering that cross section is concave arc shape under the surrounding of described top board side, on described chipware surrounding side, edge and lower edge have the chamfering that cross section is concave arc shape respectively, along having the chamfering that cross section is concave arc shape in the surrounding of described pedestal, described top board, chipware, pedestal form described annular groove at faying face place after fastening.
4. the combined insulation cushion block of the dry-type transformer according to Claims 2 or 3, is characterized in that: the circumferential lateral surface between upper and lower two concave arc shape chamferings of described chipware forms a bulge loop.
5. the combined insulation cushion block of the dry-type transformer according to Claims 2 or 3, is characterized in that: described chipware surrounding side is provided with at least two annular grooves along short transverse, and is a bulge loop between described adjacent annular groove; Circumferential lateral surface between two upper and lower concave arc shape chamferings of described chipware and adjacent described annular groove forms two bulge loops.
6., according to the combined insulation cushion block of the dry-type transformer of Claims 2 or 3 according to any one of it, it is characterized in that: the shape of described top board, pedestal, chipware is Long Circle or ellipse.
7. the combined insulation cushion block of dry-type transformer according to claim 4, is characterized in that: the shape of described top board, pedestal, chipware is Long Circle or ellipse.
8. the combined insulation cushion block of dry-type transformer according to claim 5, is characterized in that: the shape of described top board, pedestal, chipware is Long Circle or ellipse.
9., according to the combined insulation cushion block of the dry-type transformer of claim 1-3 according to any one of it, it is characterized in that: recessed seam and the male half coupling of the recessed seam of described top board, the male half coupling of described pedestal, described chipware are Long Circle.
10., according to the combined insulation cushion block of the dry-type transformer of claim 1-3 according to any one of it, it is characterized in that: the length of described top board is equal to or greater than the length of described pedestal, chipware.
11., according to the combined insulation cushion block of the dry-type transformer of claim 1-3 according to any one of it, is characterized in that: the length of described top board, chipware and pedestal increases successively, above the two ends of combined insulation cushion block, form two oblique angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110300004.8A CN103021639B (en) | 2011-09-28 | 2011-09-28 | The combined insulation cushion block of dry-type transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110300004.8A CN103021639B (en) | 2011-09-28 | 2011-09-28 | The combined insulation cushion block of dry-type transformer |
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| CN103021639A CN103021639A (en) | 2013-04-03 |
| CN103021639B true CN103021639B (en) | 2016-03-30 |
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| CN201110300004.8A Active CN103021639B (en) | 2011-09-28 | 2011-09-28 | The combined insulation cushion block of dry-type transformer |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2806436B1 (en) * | 2013-05-21 | 2016-03-23 | ABB Technology Ltd | Electrical insulation system |
| CN104332287B (en) * | 2014-11-14 | 2017-01-11 | 重庆红岢电力绝缘配件有限责任公司 | Dry-type transformer insulation pad and fabrication method thereof |
| EP3901974A1 (en) * | 2020-04-20 | 2021-10-27 | ABB Power Grids Switzerland AG | Component and method for manufacturing insulating spacers |
| CN114337079B (en) * | 2021-12-17 | 2024-06-07 | 哈尔滨电气动力装备有限公司 | Combined cushion block with adjustable overall height in step and combining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200965820Y (en) * | 2006-10-24 | 2007-10-24 | 谭勇 | Dry-type transformer umbrella type insulation shim |
| KR100827687B1 (en) * | 2006-11-29 | 2008-05-07 | 신한전기공업주식회사 | Assembly type spacer for transformer and transformer having the same |
| CN201527900U (en) * | 2009-11-13 | 2010-07-14 | 重庆源通干式变压器有限公司 | Transformer coil mounting and positioning combination |
| CN201918245U (en) * | 2010-11-15 | 2011-08-03 | 合肥元贞电气有限公司 | Damping cushion for transformer core |
| CN202258723U (en) * | 2011-09-28 | 2012-05-30 | 新华都特种电气股份有限公司 | Combined insulating spacer for air-immersed transformers |
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2011
- 2011-09-28 CN CN201110300004.8A patent/CN103021639B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200965820Y (en) * | 2006-10-24 | 2007-10-24 | 谭勇 | Dry-type transformer umbrella type insulation shim |
| KR100827687B1 (en) * | 2006-11-29 | 2008-05-07 | 신한전기공업주식회사 | Assembly type spacer for transformer and transformer having the same |
| CN201527900U (en) * | 2009-11-13 | 2010-07-14 | 重庆源通干式变压器有限公司 | Transformer coil mounting and positioning combination |
| CN201918245U (en) * | 2010-11-15 | 2011-08-03 | 合肥元贞电气有限公司 | Damping cushion for transformer core |
| CN202258723U (en) * | 2011-09-28 | 2012-05-30 | 新华都特种电气股份有限公司 | Combined insulating spacer for air-immersed transformers |
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