CN211294840U - Continuous winding of power transformer and power transformer - Google Patents
Continuous winding of power transformer and power transformer Download PDFInfo
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- CN211294840U CN211294840U CN202020232233.5U CN202020232233U CN211294840U CN 211294840 U CN211294840 U CN 211294840U CN 202020232233 U CN202020232233 U CN 202020232233U CN 211294840 U CN211294840 U CN 211294840U
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- 238000004804 winding Methods 0.000 title claims abstract description 165
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 235000012771 pancakes Nutrition 0.000 claims description 145
- 230000017105 transposition Effects 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000015895 biscuits Nutrition 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model provides a power transformer's continuous type winding, the continuous type winding includes: a wire inlet part; n pie-shaped coils sequentially stacked at first to Nth stacking positions, N being an even number greater than or equal to 4, the pie-shaped coils located at one of the second to N-1 th stacking positions being connected to the wire inlet part. Compared with the prior art, the winding is led in from the cake-shaped coil in the middle instead of the cake-shaped coil at the end part, so that the series capacitance between cakes in the continuous winding can be increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
Description
Technical Field
The utility model relates to a power transformer field especially relates to a power transformer's winding and power transformer.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and mainly comprises a Primary winding (Primary winding), a Secondary winding (Secondary winding) and an iron Core (Core). The primary winding is the winding of the power input end of the transformer, the secondary winding is the winding of the power output end, and the primary winding and the secondary winding are wound on the iron core.
In the prior art, a continuous winding adopted by a transformer is of a first cake incoming line structure, and under high-frequency lightning impact of the winding, the voltage gradient between cakes of the first number of cakes is too high, so that the potential distribution along the coil is not uniform enough, and the insulation performance is poor.
In order to improve the lightning impulse resistance of the transformer winding, one way is to change the structure of the continuous winding, for example, to increase the thickness of the insulation paper of the wire and increase the distance between the winding blocks to increase the allowable voltage value between the blocks, but this will result in a decrease in the space filling rate of the winding and an increase in the material cost.
Another way is to improve the potential distribution of the winding by using special winding, a knotted winding or an inner shielded winding. However, for the intertwined winding, operations such as cutting and welding of the winding wire are generally required, which increases the manufacturing time of the winding and the risk points caused by welding; for the inner shielded winding, the space utilization rate of the winding is reduced by inserting the shielding lead, and the material cost of the winding is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving above-mentioned and/or other technical problem to a power transformer's continuous type winding and power transformer are provided, with the lightning impulse resistance ability that promotes the winding, improve the potential distribution of winding, improve the insulating properties of winding.
In order to achieve the above object, the utility model provides a power transformer's continuous type winding, the continuous type winding includes: a wire inlet part; n pie-shaped coils sequentially stacked at first to Nth stacking positions, N being an even number greater than or equal to 4, the pie-shaped coils located at one of the second to N-1 th stacking positions being connected to the wire inlet part. Therefore, the winding is led in from the cake-shaped coil in the middle instead of the cake-shaped coil at the end part, so that the series capacitance among cakes in the continuous winding can be increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
In an embodiment of the present invention, the pancake coils located at the second stacking position among the N pancake coils are connected to the wire inlet portion. Therefore, the winding is led in from the second cake-shaped coil, the series capacitance between cakes in the continuous winding can be increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
In an embodiment of the present invention, a pancake coil located at the third stacking position among the N pancake coils is connected to the wire inlet portion. Therefore, the winding is led in from the third cake-shaped coil, the series capacitance between cakes in the continuous winding can be increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
In an embodiment of the present invention, the continuous winding further includes a first insulating member, the first insulating member is disposed at the wire inlet position of the wire inlet portion, so as to insulate the pancake coil connected to the wire inlet portion from the adjacent pancake coil. Therefore, the first insulating part is arranged at the wire inlet position of the wire inlet part, and the insulating property of the winding is further improved.
In an embodiment of the present invention, the continuous winding further includes a second insulating member, and the second insulating member is disposed at the transposition positions of the N pancake coils to insulate the two pancake coils at the transposition positions. Therefore, the second insulating part is arranged at the transposition positions of the N pancake coils, and the insulating property of the winding is further improved.
The utility model discloses an in the embodiment, be equipped with a plurality of insulating cushion blocks of spaced each other between the adjacent cake formula coil, adjacent in a plurality of insulating cushion blocks clearance between the insulating cushion block forms follows the cooling oil duct of the direction of piling up of N cake formula coil. Therefore, a cooling oil duct is arranged between the adjacent cake-shaped coils, and the heat dissipation performance of the winding can be improved.
In an embodiment of the present invention, the N pancake coils are circular pancake coils. Therefore, the structure of the pancake coil can be more compact, and the space utilization rate of the winding is improved.
In an embodiment of the present invention, the N pancake coils are formed by winding multiple turns of a wire, and the wire includes multiple parallel wires. For this purpose, the current flow through the winding can be increased by means of a plurality of parallel-connected lines, so that the current load on the winding is increased.
In an embodiment of the present invention, the wire is a copper wire or an aluminum wire. Therefore, the copper wire or the aluminum wire is used as the lead, so that the material cost of the lead can be reduced.
The utility model also provides a power transformer, a serial communication port, include as above continuous type winding. The power transformer comprises the continuous winding, and the lightning impulse resistance can be improved.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention.
Wherein,
FIG. 1 is a schematic wiring diagram of a continuous winding;
FIG. 2 is a schematic wiring diagram of an inner shielded winding;
FIG. 3 is a schematic wiring diagram of a tangle winding;
fig. 4 is a schematic wiring diagram of a continuous winding according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a continuous winding according to another embodiment of the present invention.
Description of the reference numerals
100 continuous winding
101 cake type coil
102 turns of wire
200 inner shielded winding
201 cake type coil
202 turns of wire
203 shielded conductor
300 intertwined winding
301 pancake coil
302 turns of wire
400 continuous winding
401 first pancake coil
402 second pancake coil
403 third pancake coil
404 fourth pancake coil
410 turn line
500 winding
501 first pancake coil
502 second pancake coil
503 third pancake coil
504 fourth pancake coil
510 turns of wire
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited by the specific embodiments disclosed below.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary words "below" and "beneath" can encompass both an orientation of up and down. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein should be interpreted accordingly.
Fig. 1 is a schematic wiring diagram of a continuous winding 100. As shown in fig. 1, the continuous winding 100 includes at least 4 stacked pancake coils 101, each of which is formed by winding 8 turns of a wire turn 102. In the 4 stacked pancake coils 101, the positive pancake coils and the negative pancake coils are alternately arranged, and the first pancake coils, the second pancake coils, the third pancake coils and the fourth pancake coils are respectively arranged from the top of the winding 100, wherein the first pancake coils are wire inlet biscuits. Under high-frequency lightning impulse, the voltage gradient between the first cake and the second cake of the continuous winding is too high, so that the potential distribution along the coil is not uniform enough, and the insulation performance is poor.
In order to improve the lightning impulse resistance of the transformer winding, one way is to change the structure of the continuous winding, for example, to increase the thickness of the insulation paper of the wire and increase the distance between the winding blocks to increase the allowable voltage value between the blocks, but this will result in a decrease in the space filling rate of the winding and an increase in the material cost. Another approach is to use special windings.
Fig. 2 is a schematic wiring diagram of an inner shielded winding 200. As shown in fig. 2, the inner shielded winding 200 includes at least 4 stacked pancake coils 201, each pancake coil 201 is formed by winding 5 turns of a turn 202, and a shielding wire 203 is disposed between adjacent turns in each pancake coil 201. However, for the inner shielded winding 200, inserting the shielding wire may reduce the space utilization of the winding and increase the material cost of the winding.
Fig. 3 is a schematic wiring diagram of a tangle winding 300. As shown in fig. 3, the intertwined winding 300 includes at least 4 stacked pancake coils 301, each pancake coil is formed by winding 8 turns of a turn line 302, and there is a intertwining position between adjacent pancake coils, which usually requires operations such as cutting and welding of winding wires, which increases the manufacturing time of the winding and the risk points caused by welding.
The utility model aims at providing a power transformer's continuous type winding to promote the anti lightning impulse ability of winding, improve the potential distribution of winding, improve the insulating properties of winding.
The utility model discloses a continuous type winding includes inlet wire portion and a N cake formula coil. The utility model discloses in, the incoming line portion is the position of going out of continuous type winding for to continuous type winding input power. The N pie-shaped coils are sequentially stacked at a first stacking position to an nth stacking position, which are sequentially a first pie-shaped coil, a second pie-shaped coil, a third pie-shaped coil, …, an N-1 pie-shaped coil and an nth pie-shaped coil, wherein N is an even number greater than or equal to 4, and may be, for example, 4, 6, 8, 10, etc. The pancake coils of the N pancake coils located at one of the second to N-1 th stacking positions are connected to the wire inlet portion. In other words, the continuous winding is not the first pancake lead-in but is lead-in from the middle pancake coil.
The utility model provides a power transformer's continuous type winding, from the cake formula coil inlet wire in the middle of, rather than the cake formula coil inlet wire from the tip, can increase the series capacitance between the interior cake of continuous type winding, voltage distribution is more even under the lightning impulse, has improved the insulating properties of winding.
The continuous winding of the present invention is explained below based on a specific example.
Fig. 4 is a schematic wiring diagram of a continuous winding 400 according to an embodiment of the present invention. For simplicity of illustration, only 4 pancake coils are shown in fig. 4. With the end of the continuous winding 400 as a starting point, 4 pancake coils are sequentially stacked at a first stacking position to a fourth stacking position, which are a first pancake coil 401, a second pancake coil 402, a third pancake coil 403, and a fourth pancake coil 404, respectively.
The second pancake coil 402 of the 4 pancake coils located at the second stacked position is connected to the wire inlet portion of the continuous winding 400, that is, the continuous winding 400 is fed with wire from the second pancake coil 402.
The second pancake coil 402 of the incoming wire is a positive pancake coil, the position of the second pancake coil is changed to a first pancake coil 401 at the inner side of the continuous winding 400, the first pancake coil 401 is a reverse pancake coil, the position of the first pancake coil 401 is changed to a third pancake coil 403 at the outer side of the continuous winding 400, the third pancake coil 403 is a positive pancake coil, the position of the third pancake coil 403 is changed to a fourth pancake coil 404 at the inner side of the continuous winding 400, the fourth pancake coil 404 is a reverse pancake coil, and then the positive pancake coil and the reverse pancake coil are alternately formed in sequence until all the pancake coils are formed.
In the embodiment of the present invention, the positive pancake coil refers to the pancake coil wound from the outside to the inside of the continuous winding, and the negative pancake coil refers to the pancake coil wound from the inside to the outside of the continuous winding.
The pancake coil can be formed by winding a plurality of turns of a coil wire. Preferably, the pancake coil can be formed by winding 2-50 turns of the winding wire. In the continuous winding shown in fig. 4, the first pancake coil 401, the second pancake coil 402, the third pancake coil 403, and the fourth pancake coil 404 are each formed by continuously winding 8 turns of a turn line 410. The turns 410 may include a plurality of wires connected in parallel. Through a plurality of parallel wires, the passing current of the winding can be increased, so that the current load of the winding is increased. The plurality of parallel wires can be connected in parallel up and down or in parallel left and right. The wires in parallel with each other in a single turn 410 may be separated by an insulating paper. Preferably, the wires in the turns can be copper wires or aluminum wires. And a copper wire or an aluminum wire is used as the lead, so that the material cost of the lead can be reduced.
Taking the second pancake coil 402 as an example, the turn wire starts to be wound at the outermost side of the continuous winding 400 to form the 1 st turn (the 1 st turn), then is sequentially wound from outside to inside to form the 2 nd turn and the 3 rd turn until the 8 th turn to form the second pancake coil 402, then is upwardly shifted to the 9 th turn of the first pancake coil 401, and is sequentially wound from inside to outside to the 16 th turn to form the first pancake coil 401.
Because the continuous winding 400 is fed from the second pancake coil 402, the difference of the serial numbers of the turns between the second pancake coil 402 and the third pancake coil 403 is increased, so that the series capacitance between the cakes in the continuous winding 400 is increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
In some embodiments of the present invention, the continuous winding may further include a first insulating member disposed at the wire inlet position of the wire inlet portion to insulate the pancake coil connected to the wire inlet portion from an adjacent pancake coil. The first insulating part is arranged at the wire inlet position of the wire inlet part, so that the insulating property of the winding is further improved. Taking the continuous winding 400 as an example, a first insulating member is disposed at a wire feeding position of the wire feeding portion to insulate the second pancake coil 402 from the first pancake coil 401 and the third pancake coil.
In other embodiments of the present invention, the continuous winding further includes a second insulating member, and the second insulating member is disposed at the transposition position of the N pancake coils to insulate the two pancake coils at the transposition position. And a second insulating part is arranged at the transposition positions of the N cake-shaped coils, so that the insulating property of the winding is further improved. Taking the continuous winding 400 as an example, a second insulating member is disposed at the position where the second pancake coil 402 and the first pancake coil 401 are transposed, so as to insulate the second pancake coil 402 from the first pancake coil 401.
In still other embodiments of the present invention, a plurality of insulating blocks are disposed between adjacent pancake coils, and a gap between adjacent insulating blocks in the plurality of insulating blocks forms a cooling oil passage along the stacking direction of the N pancake coils. Therefore, a cooling oil duct is arranged between the adjacent cake-shaped coils, and the heat dissipation performance of the winding can be improved.
Preferably, the pancake coil can be a circular pancake coil, so that the structure of the pancake coil is more compact, and the space utilization rate of the winding is improved. It will be appreciated that the pancake coils may also be pancake coils of other shapes, such as elliptical or rectangular pancake windings.
Fig. 5 is a schematic wiring diagram of a continuous winding 500 according to another embodiment of the present invention. The continuous winding 500 has a similar structure to the continuous winding 400 except that the continuous winding 500 is fed from the third pancake coil. The continuous winding 500 of the present invention will be described with reference to fig. 5.
As shown in fig. 5, with the end of the continuous winding 500 as a starting point, 4 pancake coils are sequentially stacked at a first stacking position to a fourth stacking position, a first pancake coil 501, a second pancake coil 502, a third pancake coil 503, and a fourth pancake coil 504, respectively.
The third pancake coil 503 of the 4 pancake coils located at the third stacked position is connected to the wire inlet portion of the continuous winding 500, that is, the continuous winding 500 is fed with wire from the third pancake coil 503.
The third pancake coil 503 of the incoming wire is a positive pancake coil, the position of the third pancake coil 503 is changed to the second pancake coil 502 on the inner side of the continuous winding 500, the second pancake coil 502 is a reverse pancake coil, the second pancake coil 502 is changed to the first pancake coil 501 on the outer side of the continuous winding 500, the first pancake coil 501 is a positive pancake coil, the position of the first pancake coil 501 is changed to the fourth pancake coil 504 on the inner side of the continuous winding 500, the fourth pancake coil 504 is a reverse pancake coil, and then the positive pancake coil and the reverse pancake coil are alternately formed in sequence until all the pancake coils are formed.
Because the continuous winding 500 is fed from the third pancake coil 503, the difference of the serial numbers of the turns between the third pancake coil 503 and the fourth pancake coil 504 is increased, so that the series capacitance between the cakes in the continuous winding 500 is increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved.
The utility model also provides a power transformer, include as above the winding. The winding is led in from the cake-shaped coil in the middle, but not from the cake-shaped coil at the end part, so that the series capacitance between cakes in the continuous winding can be increased, the voltage distribution is more uniform under the lightning impulse, and the insulation performance of the winding is improved. The power transformer comprises the continuous winding, and the lightning impulse resistance can be improved. It will be appreciated that the power transformer may also comprise a core on which the continuous winding is wound.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (10)
1. A continuous winding (400, 500) of an electrical transformer, characterized in that the continuous winding (400, 500) comprises:
a wire inlet part;
n pie-shaped coils sequentially stacked at first to Nth stacking positions, N being an even number greater than or equal to 4, the pie-shaped coils located at one of the second to N-1 th stacking positions being connected to the wire inlet part.
2. A continuous winding (400, 500) of a power transformer according to claim 1, characterized in that the pancake coils of the N pancake coils located at the second stacked position are connected to the wire inlet portion.
3. A continuous winding (400, 500) of a power transformer according to claim 1, characterized in that the pancake coils of the N pancake coils located at a third stacked position are connected to the wire inlet portion.
4. A continuous winding (400, 500) of a power transformer according to any of claims 1-3, characterized in that the continuous winding further comprises a first insulation member arranged at the incoming line position of the incoming line portion to insulate a pancake coil connected to the incoming line portion from an adjacent pancake coil.
5. A continuous winding (400, 500) of a power transformer according to any of claims 1-3, characterized in that it further comprises a second insulation member arranged at the transposition positions of the N pancake coils to insulate the two pancake coils at the transposition positions.
6. The continuous winding (400, 500) of a power transformer according to any one of claims 1-3, wherein a plurality of insulating spacers are provided between adjacent pancake coils, and gaps between adjacent ones of the plurality of insulating spacers form cooling oil passages in a stacking direction of the N pancake coils.
7. A continuous winding (400, 500) of a power transformer according to any of claims 1-3, characterized in that the N pancake coils are circular pancake coils.
8. A continuous winding (400, 500) of a power transformer according to any of claims 1-3, characterized in that said N pancake coils are formed by winding a plurality of turns on a wire, said wire comprising a plurality of wires connected in parallel.
9. Continuous winding (400, 500) of an electrical transformer according to claim 8, characterized in that the wires are copper or aluminium wires.
10. A power transformer, characterized by comprising a continuous winding (400, 500) according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020232233.5U CN211294840U (en) | 2020-02-28 | 2020-02-28 | Continuous winding of power transformer and power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020232233.5U CN211294840U (en) | 2020-02-28 | 2020-02-28 | Continuous winding of power transformer and power transformer |
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| Publication Number | Publication Date |
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| CN211294840U true CN211294840U (en) | 2020-08-18 |
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| CN202020232233.5U Active CN211294840U (en) | 2020-02-28 | 2020-02-28 | Continuous winding of power transformer and power transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466656A (en) * | 2020-11-17 | 2021-03-09 | 保定天威集团特变电气有限公司 | Continuous winding method containing half-turn structure |
| CN114068173A (en) * | 2021-11-29 | 2022-02-18 | 上海电气集团(张家港)变压器有限公司 | Winding method of inter-strand shielding wire of power transformer and power transformer |
-
2020
- 2020-02-28 CN CN202020232233.5U patent/CN211294840U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112466656A (en) * | 2020-11-17 | 2021-03-09 | 保定天威集团特变电气有限公司 | Continuous winding method containing half-turn structure |
| CN114068173A (en) * | 2021-11-29 | 2022-02-18 | 上海电气集团(张家港)变压器有限公司 | Winding method of inter-strand shielding wire of power transformer and power transformer |
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Address after: No.26 Jungong Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee after: Guangzhou Siemens Energy Transformer Co.,Ltd. Address before: No.26 Jungong Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong Province Patentee before: SIEMENS TRANSFORMER (GUANGZHOU) Co.,Ltd. |