CN215527410U

CN215527410U - Transformer device

Info

Publication number: CN215527410U
Application number: CN202121673692.8U
Authority: CN
Inventors: 廖威; 吴先威; 张亚旭; 解静; 刘欢; 朱德虎; 周灿文; 黄先博
Original assignee: Siemens Transformer Wuhan Co Ltd
Current assignee: Siemens Energy Transformer Wuhan Co ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-01-14
Anticipated expiration: 2031-07-22

Abstract

The utility model provides a transformer. A transformer comprising a coil (20) and a bushing (10) for leading lead-out wires of the coil (20) to the outside of a transformer housing (30), the bushing (10) being arranged based on a voltage gradient over the coil (20) such that: the bushing region of the bushing (10) at which the highest potential is located and the coil region of the coil (20) at which the highest potential of the bushing (10) is at the same potential are spatially opposite. The utility model realizes the compact design of the transformer, can more effectively utilize the limited space of the transformer and reduce the weight of the transformer and the space occupation ratio of a transformer substation.

Description

Transformer device

Technical Field

The present invention relates generally to the field of electrical equipment, and more particularly to transformers.

Background

As is known, a bushing of a transformer is a component for guiding a high voltage lead inside the transformer to the outside of a transformer case, and a lead wire of a coil of the transformer must pass through the bushing, and the bushing insulates the lead wire from a transformer case and also plays a role of fixing the lead wire.

In transformer design, the size requirements for the transformer are very strict. In a traditional transformer, a high-voltage bushing is generally installed in a manner of a bushing lifting seat due to requirements of high voltage level, large insulation distance requirement and the like, and thus the requirement of a customer on the size of the transformer cannot be met.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a novel transformer. The utility model realizes the compact design of the transformer, can more effectively utilize the limited space of the transformer and reduce the weight of the transformer and the space occupation ratio of a transformer substation.

According to the utility model, a transformer is provided comprising a coil and a bushing for leading out lead-out wires of the coil to the outside of a transformer housing, in particular the bushing is arranged based on a voltage gradient over the coil such that: the sleeve region of the highest potential of the sleeve and the coil region of the coil, which is at the same potential as the highest potential of the sleeve, are spatially opposed to each other.

In this way, it is achieved that the bushing is arranged as close as possible to the equipotential coil component, which may reduce the insulation distance of the bushing, effectively utilizing the limited space of the transformer.

Further, the sleeve part where the highest potential of the sleeve is located and the coil part of the coil with the same potential are located at the same height in the vertical direction.

In this way, a further reduction of the insulation distance of the bushing can be achieved, more efficiently utilizing the limited space of the transformer.

Further, the coil is disposed vertically along a longitudinal axis of the coil, and the sleeve is disposed vertically along a longitudinal axis of the sleeve.

In this way, the coils and the bushings are arranged in a rational orientation, effectively utilizing the limited space of the transformer while satisfying the required insulation requirements.

Further, the bushing comprises a main body portion, a mounting flange connected with the main body portion, and a voltage-sharing ball located at one end of the main body portion, and the bushing is mounted on the mounting seat at the top of the transformer housing by using the mounting flange, wherein in a mounted state, the main body portion and the voltage-sharing ball are located in a space between a side wall of the transformer housing and the iron core in the coil.

In this way, the positions of the various parts of the bushing relative to the transformer housing are arranged in a rational manner, effectively utilizing the limited space of the transformer while satisfying the required insulation requirements.

Further, the height of the central plane of the voltage-sharing ball in the vertical direction is the same as the height of the top surface of the coil in the vertical direction; or the bottom surface of the voltage-sharing ball is at the same height as the top surface of the coil in the vertical direction.

In this way, the limited space of the transformer can be efficiently utilized while satisfying the required insulation requirements.

Further, the first shortest distance between the cannula part and the coil part is 30cm to 50 cm.

In this way, the distance between the bushing portion and the coil portion can be significantly reduced while the required insulation requirements are met, thereby saving limited space within the transformer.

Further, a second shortest distance of the bushing location to a side wall of the transformer housing is 180cm to 210 cm.

In this way, limited space within the transformer may be saved while meeting the required insulation requirements.

Further, the coil is an outermost coil, and an additional inner coil is provided radially inside the outermost coil.

In such a way, the position of the sleeve corresponding to the outgoing line of the outermost coil is reasonably distributed, so that the required insulation requirement can be met, and meanwhile, the limited space in the transformer can be saved.

Further, the mounting seat at the top of the transformer housing is provided with a concave mounting groove, and the mounting flange of the bushing is embedded into the mounting groove.

In this way, the limited space of the transformer is utilized rationally, enabling a compact design of the transformer.

In summary, the transformer of the present invention at least achieves the following beneficial effects: the compact design of the transformer is realized while the insulation distance of the sleeve of the transformer is ensured, the limited space of the transformer can be more effectively utilized, and the weight of the transformer and the space occupation ratio of a transformer substation are reduced.

Drawings

The foregoing and other features and advantages of the utility model will become more apparent to those skilled in the art to which the utility model relates upon consideration of the following detailed description of a preferred embodiment of the utility model with reference to the accompanying drawings, in which:

fig. 1 is a partially cut-away schematic view of a transformer according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic diagram of a voltage gradient profile of the coils of the transformer in fig. 1.

Fig. 3 is a schematic illustration of the voltage gradient profile of the bushing of fig. 1.

Wherein the reference numbers are as follows:

10. a sleeve;

11. a body portion;

12. installing a flange;

13. a pressure equalizing ball;

14. a porcelain tube;

15. a casing hoisting ring;

20. a coil;

21. a top surface;

30. a transformer housing;

31. a mounting seat;

32. assembling the components;

33. a top portion;

40. an inner coil;

50. an iron core;

l1, longitudinal axis of the cannula;

l2, longitudinal axis of coil;

um, maximum potential;

ur, intermediate potential;

n, a neutral point;

d', a first shortest distance;

D. the second shortest distance.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by examples below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise.

Referring first to fig. 1, fig. 1 is a partially cut-away schematic view of a transformer according to an exemplary embodiment of the present invention. The transformer in fig. 1 includes a coil 20 and a bushing 10 for guiding lead-out wires of the coil 20 to the outside of a transformer housing 30.

As can be seen from fig. 1 (see also fig. 3), the bushing 10 comprises a main body portion 11, a mounting flange 12 connected to the main body portion 11, and a voltage-sharing ball 13 at one end of the main body portion 11, the bushing 10 being mounted on a mounting seat 31 of a top 33 of the transformer housing 30 by means of the mounting flange 12, wherein, in a mounted state, the main body portion 11 and the voltage-sharing ball 13 are located in a space between a side wall of the transformer housing 30 and the iron core 50 in the coil 20. The mounting seat 31 of the top 33 of the transformer housing 30 is provided with a recessed mounting groove into which the mounting flange 12 of the bushing 10 is inserted. Also shown in fig. 1 are assembly components 32 that mount the top 33 and sidewalls of the transformer housing 30 together. In addition, the porcelain tube 14 and the casing hanger ring 15 of the casing 10 are also shown in FIG. 1, but these components are not discussed in detail so as not to be confused, since they are not relevant to the aspects of the present invention which are to be improved upon.

It will be understood by those skilled in the art that lead-out wires (not shown) of the coil 20 are introduced into the bushing 10 through the bottom of the voltage-equalizing balls 13, so that the lead-out wires are led out to the outside of the transformer housing 30 for use. An important aspect of the utility model is that the bushing 10 is arranged based on the voltage gradient over the coil 20 such that: the bushing portion where the highest potential of the bushing 10 is located and the coil portion of the coil 20 where the highest potential of the bushing 10 is located are spatially opposite, i.e. the two are spatially opposite, may be referred to as an equipotential arrangement, so that the insulation distance between the bushing 10 and the coil 20 may be small. This aspect is explained in detail below with reference to fig. 2 and 3 of the present application.

Fig. 2 is a schematic diagram of a voltage gradient profile of the coil 20 of the transformer in fig. 1, and fig. 3 is a schematic diagram of a voltage gradient profile of the bushing 10 in fig. 1.

As can be seen from fig. 2, the coil 20 has a voltage gradient, i.e. a voltage drop, from a highest potential Um, which is located at the top of the coil 20, to a neutral point N, which is located at the bottom of the coil 20. In addition, Ur in the figure represents an intermediate potential, which represents an unspecific value, which is an intermediate value representing a voltage drop.

As can be seen from fig. 3, the bushing 10 has the highest potential Um at the pressure-equalizing ball 13. Since the lead-out wires (not shown) of the coil 20 are introduced into the sleeve 10 through the bottom of the voltage-sharing balls 13, the potential difference between the voltage-sharing balls 13 and the top of the coil 20 is very small and can be ignored to some extent. Therefore, the first shortest distance D' (see fig. 1) between the voltage-equalizing balls 13 and the coil 20 can be small, and the first shortest distance only needs to satisfy the mechanical operation space requirement of the relevant parts of the transformer, for example, the installation operation requirement of the bushing, and the like. The first shortest distance D' is for example 20cm to 70cm, preferably 40cm to 50cm, for example 45 cm.

From the above, the highest potential Um of the coil 20 is located at the top of the coil 20, while the highest potential Um of the sleeve 10 is at the location of the pressure-equalizing balls 13. Therefore, in the present embodiment, the top of the sleeve 10 is located within substantially the same vertical height as the pressure equalizing ball 13.

Furthermore, with reference to fig. 1, the coil 20 is arranged vertically along the longitudinal axis L2 of the coil 20 and the cannula 10 is arranged vertically along the longitudinal axis L1 of the cannula 10, it being evident that both the longitudinal axis L2 of the coil and the longitudinal axis L1 of the cannula are parallel. Of course, the directions of the two can be adjusted properly if necessary for the design.

In the embodiment of fig. 1, the pressure-equalizing balls 13 have a columnar shape, and the height of the center plane of the pressure-equalizing balls 13 in the vertical direction is substantially the same as the height of the top surface 21 of the coil 20 in the vertical direction. Tests have shown that when such a height setting is satisfied, it is possible to ensure that the potential of the voltage-equalizing balls 13 is substantially the same potential as the potential of the top surface 21 of the coil 20, so that the above-mentioned first shortest distance D' is as small as possible, and the overall height dimension of the transformer can be reduced. Alternatively, the bushing 10 may also be arranged such that: the bottom surface of the pressure equalizing ball 13 is at the same height as the top surface 21 of the coil 20, and the design object of the present invention can be achieved as well: arranging the bushing as close as possible to the equipotential coils makes it possible to make the above-mentioned first shortest distance D' as small as possible, making efficient use of the limited space of the transformer.

In other words, the height of the voltage-sharing balls 13 relative to the top surface 21 of the coil 20 can be suitably adjusted, lowered or raised in a small amount, according to the specific design requirements of the transformer, as long as it is satisfied that the two correspond in spatial position, and the bushing is arranged in the vicinity of the equipotential coil portion.

With continued reference to fig. 1, for example, a voltage level of 220kV, the second shortest distance D between the voltage-equalizing ball 13 and the sidewall of the transformer housing 30 may be 150cm to 240cm, and is preferably: from 180cm to 210cm, for example 200 cm. It should be noted that the coil 20 is an outermost coil, and an additional inner coil 40 may be provided in the outermost coil. Since the outermost coil surrounds the inner coil 40, the above-described equipotential arrangement between the voltage-equalizing balls 13 of the bushing 10 and the coil 20 need only be satisfied to achieve the object of the present invention regardless of the voltage of the inner coil.

In order to more clearly understand the solution of the present invention, a method of arranging a bushing of a transformer is described below, the method comprising the steps of: setting the coil 20, and determining the potential of each part of the coil 20; providing a bushing 10 for leading the lead-out wire of the coil 20 to the outside of the transformer housing 30 and determining the highest potential on the bushing 10; and arranging the cannula 10 based on the voltage gradient over the coil 20 such that: the bushing region of the bushing 10 at which the highest potential is located and the coil region of the coil 20 at which the highest potential of the bushing 10 is at the same potential are spatially opposite. By the arrangement method, the insulation distance of the sleeve 10 of the transformer is ensured, meanwhile, the compact design of the transformer is realized, the limited space of the transformer can be more effectively utilized, and the weight of the transformer and the space occupation ratio of a transformer substation are reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A transformer comprising a coil (20) and a bushing (10) for leading lead-out wires of the coil (20) to the outside of a transformer housing (30), characterized in that the bushing (10) is arranged based on a voltage gradient over the coil (20) such that: the bushing region of the bushing (10) at which the highest potential is located and the coil region of the coil (20) at which the highest potential of the bushing (10) is at the same potential are spatially opposite.

2. Transformer according to claim 1, characterized in that the bushing part of the bushing (10) at the highest potential is at the same height in the vertical direction as the coil part of the coil (20) at the same potential.

3. The transformer according to claim 1 or 2, characterized in that the coil (20) is arranged vertically along a longitudinal axis (L2) of the coil (20) and the bushing (10) is arranged vertically along a longitudinal axis of the bushing (10).

4. A transformer according to claim 1 or 2, characterised in that the bushing (10) comprises a body part (11), a mounting flange (12) connected to the body part (11) and a voltage-equalizing ball (13) at one end of the body part (11), the bushing (10) being mounted with the mounting flange (12) on a mounting seat (31) at the top (33) of the transformer housing (30), wherein, in the mounted state, the body part (11) and the voltage-equalizing ball (13) are located in the space between the side walls of the transformer housing (30) and the core (50) in the coil (20).

5. The transformer according to claim 4, characterized in that the height of the center plane of the voltage-equalizing balls (13) in the vertical direction is the same height as the height of the top surface (21) of the coil (20) in the vertical direction; or the bottom surface of the pressure equalizing ball (13) is at the same height as the top surface (21) of the coil (20) in the vertical direction.

6. Transformer according to claim 1 or 2, characterized in that the first shortest distance (D') between the bushing site and the coil site is 40-50 cm.

7. Transformer according to claim 1 or 2, characterized in that the second shortest distance (D) of the bushing site to the side wall of the transformer housing is 180-210 cm.

8. A transformer according to claim 1 or 2, characterized in that the coil (20) is the outermost coil, radially inside of which an additional inner coil (40) is arranged.

9. Transformer according to claim 4, characterized in that the mounting seat (31) of the top part (33) of the transformer housing (30) is provided with a recessed mounting groove into which the mounting flange (12) of the bushing (10) is inserted.