CN211265236U

CN211265236U - Layered coil structure and power transformer

Info

Publication number: CN211265236U
Application number: CN201921455738.1U
Authority: CN
Inventors: 孙树波; 刘金波; 田国华; 李春常; 段成; 陆帅; 陈伦伦; 肖长河; 黄彪; 于水; 陈鹏; 凡新; 陈光胜
Original assignee: TBEA Hengyang Transformer Co. Ltd
Current assignee: TBEA Hengyang Transformer Co. Ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-08-14
Anticipated expiration: 2029-09-03

Abstract

The utility model provides a layer coil structure and power transformer. The layered coil structure includes: the inner insulating cylinder and the plurality of layers of layered coils wound on the inner insulating cylinder from inside to outside in sequence; each layer of layered coil is of a barrel-shaped structure. The layered coil structure of the utility model can reduce the height of the whole coil, further reduce the height of the transformer body on the basis of ensuring the reliability of the product, correspondingly reduce the manufacturing cost of the transformer and improve the market competitiveness; and because the layer coil is the cask formula structure, need not place the oil duct cushion when every layer coil coiling, the coiling is simple, can promote whole coiling efficiency.

Description

Layered coil structure and power transformer

Technical Field

The utility model relates to a transformer technical field, concretely relates to layer coil structure to and a power transformer.

Background

With the continuous development of power transformer technology, in order to meet the ever-changing market demands, high reliability and low cost are the pursuit targets of various transformer production enterprises, and only if the two points are achieved, the enterprises can survive in intense market competition.

The 110kV three-winding structure transformer is one of important devices which are widely applied in a power system, and is also one of key devices for a power transmission system to transition to a power distribution system. The economics of this type of construction transformer technology have reached a bottleneck due to intense market competition. In the current mature transformer body structure, the low-voltage coil is generally in a spiral or continuous mode, and the height of the transformer body is difficult to reduce due to the requirement of copper conductor production manufacturability, so that the whole manufacturing cost of the transformer is difficult to further reduce.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve, at least in part, the technical problems occurring in the prior art.

Solve the utility model discloses the technical scheme that technical problem adopted is:

the utility model provides a layer coil structure, it includes: the inner insulating cylinder and the plurality of layers of layered coils wound on the inner insulating cylinder from inside to outside in sequence; each layer of layered coil is of a barrel-shaped structure.

Optionally, the layered coil structure further comprises: the inner supporting strip is arranged between the inner insulating cylinder and the innermost layer type coil, and the outer supporting strip is arranged on the outer side of the outermost layer type coil.

Optionally, the layered coil structure further comprises: and an interlayer stay arranged between two adjacent layer type coils.

Optionally, the layered coil structure further comprises: and a plurality of insulating rings respectively arranged at two ends of each layer type coil.

Optionally, the number of layers of the layer coil is 2-8.

Further, the number of layers of the layer coil is 6.

The utility model also provides a power transformer, it includes: the transformer comprises an iron core, and a low-voltage coil, a medium-voltage coil, a high-voltage coil and a voltage regulating coil which are wound on the iron core from inside to outside in sequence, wherein the low-voltage coil adopts the layered coil structure.

Optionally, the power transformer further comprises: the first stay and the first insulation paperboard cylinder which are arranged between the low-voltage coil and the medium-voltage coil, the second stay and the second insulation paperboard cylinder which are arranged between the medium-voltage coil and the high-voltage coil, and the third stay and the third insulation paperboard cylinder which are arranged between the high-voltage coil and the pressure regulating coil.

Optionally, the power transformer further comprises: the upper insulating end rings are arranged at the upper end parts of all the coils, and the lower insulating end rings are arranged at the lower end parts of all the coils; the upper insulating end ring and the lower insulating end ring both comprise a plurality of insulating rings respectively aiming at different coils.

Optionally, the power transformer further comprises: the upper pressing plate is arranged on the upper insulating end ring, and the lower pressing plate is arranged below the lower insulating end ring.

Has the advantages that:

the layered coil structure of the utility model can reduce the height of the whole coil, further reduce the height of the transformer body on the basis of ensuring the reliability of the product, correspondingly reduce the manufacturing cost of the transformer and improve the market competitiveness; and because the layer coil is the cask formula structure, need not place the oil duct cushion when every layer coil coiling, the coiling is simple, can promote whole coiling efficiency.

Drawings

Fig. 1 is a schematic layout view of a low-voltage layered coil provided in embodiment 1 of the present invention;

fig. 2 is a schematic layout diagram of a power transformer provided in embodiment 2 of the present invention.

In the figure: 1-an inner insulating cylinder; 2A-inner stay; 2B-an outer stay; 3A-an upper insulating ring; 3B-a lower insulating ring; 4-a low voltage coil; 5-a medium voltage coil; 6-high voltage coil; 7-voltage regulating coil; 8, an upper pressing plate; 9-upper insulating end ring; 10-lower insulating end ring; 11-a lower press plate; 12A-a first stay; 13A-a first insulating cardboard cylinder; 12B-a second stay; 13B-a second insulating cardboard cylinder; 12C-a third strut; 13C-a third insulating paperboard cylinder; 14-a core; 15-layer coils; 16-interlayer stays.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1:

as shown in fig. 1, the present embodiment provides a layered coil structure, which includes: the coil comprises an inner insulating cylinder 1 and a plurality of layers of layer type coils 15 which are wound on the inner insulating cylinder 1 from inside to outside in sequence. Each layer of the layered coil 15 is of a cylindrical structure.

In the embodiment, the layered coil structure can reduce the height of the whole coil, further reduce the height of the transformer body of the transformer on the basis of ensuring the reliability of a product, correspondingly reduce the manufacturing cost of the transformer and improve the market competitiveness; and because the layer coil is the cask formula structure, need not place the oil duct cushion when every layer coil coiling, the coiling is simple, can promote whole coiling efficiency.

Wherein, the number of layers of layer coil 15 is 2 ~ 8 layers, for example: 2, 4, 6 or 8 layers.

Preferably, the number of layers of the layer coil 15 is 6.

As shown in fig. 1, the layered coil structure further comprises: an inner stay 2A disposed between the inner insulating tube 1 and the innermost layer coil, and an outer stay 2B disposed outside the outermost layer coil.

As shown in fig. 1, the layered coil structure further comprises: and interlayer stays 16 disposed between adjacent two layer coils.

As shown in fig. 1, the layered coil structure further comprises: and the insulating rings are respectively arranged at the two end parts of each layer of layered coil, namely the insulating rings are uniformly distributed at the two end parts of each layer of layered coil. Wherein, the insulating ring arranged at the upper end part of each layer type coil is an upper insulating ring 3A, and the insulating ring arranged at the lower end part of each layer type coil is a lower insulating ring 3B.

Specifically, an upper insulating ring 3A is arranged at the upper end of each layer of layer coil, and a lower insulating ring 3B is arranged at the lower end of each layer of layer coil.

Note that the inner insulating tube 1, the inner stay 2A, the interlayer stay 16, the outer stay 2B, and the

insulating rings

3A and 3B are insulating members of the layer coil structure.

The winding method of the low-voltage coil is described in detail below by taking the low-voltage coil adopting the above layer coil structure and taking an example that the number of layers of the layer coil is 6:

before the coil is wound, an internal insulation cylinder 1 and an inner supporting strip 2A are sequentially placed on a winding die, a first layer type coil LV1 is wound, an interlayer supporting strip 16 is placed after LV1 is wound, a second layer type coil LV2 is wound, and the like, and an outer supporting strip 2B is placed after a sixth layer type coil LV6 is wound, so that the whole low-voltage coil is wound. In the above process, each time the winding of one layer type coil is completed, the

insulating rings

3A and 3B are placed at both end portions thereof.

In summary, the layered coil structure provided by the embodiment can reduce the height of the whole coil, thereby reducing the height of the transformer body; moreover, because the layered coil is of a barrel-shaped structure, each layer of coil is simple to wind, and the whole winding efficiency can be improved. Meanwhile, the copper wire manufacturing process is good, the coil winding manufacturability is also good, and the parameters can be better ensured.

Example 2:

as shown in fig. 2, the present embodiment provides a power transformer, which includes: the transformer comprises an iron core 14, and a low-voltage coil 4, a medium-voltage coil 5, a high-voltage coil 6 and a voltage-regulating coil 7 which are wound on the iron core 14 from inside to outside in sequence. The low-voltage coil 4 has a layered coil structure as described in embodiment 1.

In this embodiment, the low-voltage coil adopts a layered coil structure, so that the height of the low-voltage coil can be reduced integrally, the height of the transformer body of the transformer is also reduced, the manufacturing cost of the transformer is correspondingly reduced, the requirements of copper conductor production manufacturability and coil winding manufacturability are also ensured, and the overall manufacturing cost of the transformer is further reduced.

As shown in fig. 2, the power transformer further includes: a first stay 12A and a first insulating cardboard tube 13A provided between the low-voltage coil 4 and the medium-voltage coil 5, a second stay 12B and a second insulating cardboard tube 13B provided between the medium-voltage coil 5 and the high-voltage coil 6, and a third stay 12C and a third insulating cardboard tube 13C provided between the high-voltage coil 6 and the pressure-regulating coil 7.

As shown in fig. 2, the power transformer further includes: an upper insulating end ring 9 arranged at the upper end part of all the coils and a lower insulating end ring 10 arranged at the lower end part of all the coils, wherein the upper insulating end ring 9 covers the upper end parts of the low-voltage coil 4, the medium-voltage coil 5, the high-voltage coil 6 and the voltage regulating coil 7, and the lower insulating end ring 10 covers the lower end parts of the low-voltage coil 4, the medium-voltage coil 5, the high-voltage coil 6 and the voltage regulating coil 7. Wherein the upper insulating end ring 9 and the lower insulating end ring 10 each comprise a plurality of insulating rings for different coils, respectively.

As shown in fig. 2, the power transformer further includes: an upper press plate 8 disposed on the upper insulating end ring 9, and a lower press plate 11 disposed below the lower insulating end ring 10.

It should be noted that the upper platen 8, the upper insulating end ring 9, the lower platen 11, the lower insulating end ring 10, the

stays

12A, 12B, and 12C, and the

insulating cardboard cylinders

13A, 13B, and 13C are main insulating members of the power transformer, and they constitute a main insulating structure of the power transformer.

The method of assembling the power transformer is described in detail below:

before assembly, the inner and outer diameters and the height of each coil should be controlled within a desired range of values before assembly is started.

When assembling, a lower pressing plate 11 and a lower insulating end ring 10 are sequentially arranged; then, the low-voltage coil 4, the medium-voltage coil 5, the high-voltage coil 6 and the pressure regulating coil 7 are assembled on the iron core 14 in sequence, in the coil assembling process, a first stay 12A and a first insulating paperboard cylinder 13A are required to be placed between the low-voltage coil 4 and the medium-voltage coil 5, a second stay 12B and a second insulating paperboard cylinder 13B are required to be placed between the medium-voltage coil 5 and the high-voltage coil 6, and a third stay 12C and a third insulating paperboard cylinder 13C are required to be placed between the high-voltage coil 6 and the pressure regulating coil 7; and finally, sequentially placing the upper insulating end ring 9 and the upper pressing plate 8, and finishing assembly.

In summary, in the power transformer provided by this embodiment, the low-voltage coil adopts the layered coil structure, so that the height of the low-voltage coil can be reduced as a whole, the body height of the transformer is also reduced, the manufacturing cost of the transformer is correspondingly reduced, meanwhile, the requirements of copper wire production manufacturability and coil winding manufacturability are ensured, and the overall manufacturing cost of the transformer is further reduced. Moreover, the transformer has compact integral structure, further improves short-circuit resistance, meets the requirements of national transformation upgrading and energy-saving and environment-friendly policies, and has remarkable economic and social benefits.

It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A layered coil structure, comprising: the inner insulating cylinder and the plurality of layers of layered coils wound on the inner insulating cylinder from inside to outside in sequence; each layer of the layer-by-layer coil is of a barrel-shaped structure; further comprising: the inner supporting strip is arranged between the inner insulating cylinder and the innermost layer type coil, and the outer supporting strip is arranged on the outer side of the outermost layer type coil.

2. A layered coil structure, as set forth in claim 1, further comprising: and an interlayer stay arranged between two adjacent layer type coils.

3. A layered coil structure, as set forth in claim 1, further comprising: and a plurality of insulating rings respectively arranged at two ends of each layer type coil.

4. A layered coil structure according to any one of claims 1-3, wherein the number of layers of the layered coil is from 2 to 8 layers.

5. A layered coil structure according to claim 4, in which the number of layers of said layered coil is 6.

6. An electrical transformer, comprising: the laminated coil comprises an iron core, and a low-voltage coil, a medium-voltage coil, a high-voltage coil and a voltage regulating coil which are wound on the iron core from inside to outside in sequence, wherein the low-voltage coil adopts the laminated coil structure as claimed in any one of claims 1-5.

7. A power transformer according to claim 6, characterized by further comprising: the first stay and the first insulation paperboard cylinder which are arranged between the low-voltage coil and the medium-voltage coil, the second stay and the second insulation paperboard cylinder which are arranged between the medium-voltage coil and the high-voltage coil, and the third stay and the third insulation paperboard cylinder which are arranged between the high-voltage coil and the pressure regulating coil.

8. A power transformer according to claim 6, characterized by further comprising: the upper insulating end rings are arranged at the upper end parts of all the coils, and the lower insulating end rings are arranged at the lower end parts of all the coils; the upper insulating end ring and the lower insulating end ring both comprise a plurality of insulating rings respectively aiming at different coils.

9. The power transformer of claim 8, further comprising: the upper pressing plate is arranged on the upper insulating end ring, and the lower pressing plate is arranged below the lower insulating end ring.