CN209912695U

CN209912695U - Dry-type transformer suitable for it is outdoor

Info

Publication number: CN209912695U
Application number: CN201920827601.8U
Authority: CN
Inventors: 邱卫东; 徐兵; 蒋仇明; 姚映青; 樊继玲; 张建华; 姚晓伟
Original assignee: Nantong Guoxuan New Energy Technology Co Ltd
Current assignee: Nantong Guoxuan New Energy Technology Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-01-07
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses a dry-type transformer suitable for the open air, which comprises a three-phase transformer, wherein the three-phase transformer comprises three transformer bodies; the bottom of the transformer body is provided with heat dissipation holes; the transformer bodies comprise shells, coil windings and ferromagnetic cores; the outer shells are sleeved outside the coil windings; the coil windings are all sleeved outside the ferromagnetic core; the upper ends of the ferromagnetic cores are respectively provided with an upper clamping mechanism, and the lower ends of the ferromagnetic cores are respectively correspondingly provided with a lower clamping mechanism; the lower end of the lower clamping mechanism is provided with a base in a matching way; the coil windings comprise low-voltage windings and high-voltage windings; the low-voltage windings are all arranged inside the high-voltage windings, and the high-voltage windings all extend inwards in the radial direction; protective coatings are arranged on the surfaces of the upper clamping mechanism, the lower clamping mechanism and the ferromagnetic core; the protective coatings comprise a primer layer and a finish paint layer. The utility model discloses not only reduced the size of transformer, reduced manufacturing cost, avoided causing environmental problem moreover, had extensive suitability.

Description

Dry-type transformer suitable for it is outdoor

Technical Field

The utility model relates to a dry-type transformer especially relates to a dry-type transformer suitable for it is outdoor.

Background

The transformer is an important device in power generation, power supply and power utilization enterprises, is also in a very critical position in a power grid, is a very important device for ensuring the safe and reliable operation of the power grid and the power utilization in production and life of people, and the structure and the manufacturing material of the transformer directly influence the quality and the safety of power supply. Although transformers are well established technology, there is still a need for improvements in transformers based on the needs of the existing market for transformers.

The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, main components are a primary coil, a secondary coil and an iron core, and the transformer has the following main functions: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization, and the like. If the transformer is a dry type transformer, the housing needs to be designed into a ventilation structure allowing air to enter and exit, and a protection device for preventing ultraviolet rays from being irradiated for a long time, rain, snow and the like needs to be installed, so that the size and the cost of the transformer are increased. In addition, for a liquid-filled transformer, abnormal events such as lightning strikes may occur, causing the water tank to be damaged and the dielectric fluid to overflow to the surrounding area, thereby causing environmental problems. It is therefore desirable to provide a dry distribution transformer that is suitable for installation outdoors without the need for a housing.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a dry-type transformer suitable for the open air.

In order to solve the technical problem, the utility model discloses a technical scheme is: a dry-type transformer suitable for being used outdoors comprises a three-phase transformer, wherein the three-phase transformer comprises three transformer bodies; the bottom of the transformer body is provided with heat dissipation holes; the transformer bodies comprise shells, coil windings and ferromagnetic cores; the outer shells are sleeved outside the coil windings; the coil windings are all sleeved outside the ferromagnetic core; the upper ends of the ferromagnetic cores are respectively provided with an upper clamping mechanism, and the lower ends of the ferromagnetic cores are respectively correspondingly provided with a lower clamping mechanism; the lower end of the lower clamping mechanism is provided with a base in a matching way;

the front side surface of the shell is vertically provided with a front supporting plate, and the rear side surface of the shell is symmetrically provided with a rear supporting plate; the upper ends of the front supporting plates are respectively provided with a first high-voltage sleeve, and the lower ends of the front supporting plates are respectively and correspondingly provided with a second high-voltage sleeve; the upper ends of the rear supporting plates are respectively provided with a first low-pressure sleeve, and the lower ends of the rear supporting plates are respectively correspondingly provided with a second low-pressure sleeve; the middle parts of the first low-voltage sleeves are correspondingly provided with first low-voltage conductors; the middle parts of the second low-voltage sleeves are correspondingly provided with second low-voltage conductors; the first low-pressure sleeve and the second low-pressure sleeve extend outwards and are in a truncated cone shape with gradually reduced diameters;

the coil windings comprise low-voltage windings and high-voltage windings; the low-voltage windings are all arranged inside the high-voltage windings, and the high-voltage windings all extend inwards in the radial direction;

protective coatings are arranged on the surfaces of the upper clamping mechanism, the lower clamping mechanism and the ferromagnetic core; the protective coatings comprise a primer layer and a finish paint layer.

The ferromagnetic cores comprise an upper iron yoke, a lower iron yoke and two side yokes; the lower iron yoke and the upper iron yoke are arranged oppositely left and right; the two side yokes are arranged oppositely up and down; two ends of the two side yokes are respectively connected with two ends of the upper iron yoke and the lower iron yoke to form an annular structure.

The low-voltage winding and the high-voltage winding are concentrically arranged and are cylindrical or rectangular.

The base is provided with a reinforcing rib.

The primer layer is made of epoxy zinc-rich primer; the material of the finish paint layer is aliphatic polyurethane or epoxy resin or silicon rubber.

The shell is made of one or more insulating resins.

The utility model discloses not only reduced the size of transformer, reduced manufacturing cost, avoided liquid transformer to take place dielectric fluid moreover and spill over the accident, avoided causing environmental problem, had extensive suitability.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a rear view of fig. 1.

Fig. 3 is a top view of the transformer body.

In the figure: 1. a transformer body; 2. a coil winding; 3. a ferromagnetic core; 4. a first high voltage bushing; 5. a second high voltage bushing; 6. a low voltage winding; 7. a high voltage winding; 8. a first low-pressure bushing; 9. a second low-pressure bushing; 10. a first low voltage conductor; 11. a second low voltage conductor; 12. a housing; 13. a front support plate; 14. an upper clamping mechanism; 15. a lower clamping mechanism; 16. a base.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The dry-type transformer suitable for outdoor use as shown in fig. 1 to 3 comprises a three-phase transformer, wherein the three-phase transformer comprises three transformer bodies 1; heat dissipation holes are formed in the bottom of the transformer body 1; the transformer bodies 1 respectively comprise a shell 12, a coil winding 2 and a ferromagnetic core 3; the outer shells 12 are all sleeved outside the coil windings 2; the coil windings 2 are all sleeved outside the ferromagnetic core 3; the upper ends of the ferromagnetic cores 3 are respectively provided with an upper clamping mechanism 14, and the lower ends of the ferromagnetic cores are respectively correspondingly provided with a lower clamping mechanism 15; the lower end of the lower clamping mechanism 15 is provided with a base 16 in a matching way; the base 16 is provided with a reinforcing rib. The base 16 is provided with corrugations, and the base 16 is fixed to the bottom of the lower clamping mechanism 15.

The ferromagnetic cores 3 respectively comprise an upper iron yoke, a lower iron yoke and two side yokes; the lower iron yoke and the upper iron yoke are arranged oppositely left and right; the two side yokes are arranged oppositely up and down; two ends of the two side yokes are respectively connected with two ends of the upper iron yoke and the lower iron yoke to form an annular structure. Wherein two oppositely arranged side yokes form a core leg, i.e. any two adjacent side yokes form one core leg. This can improve the mechanical strength of the ferromagnetic core 3 as a whole. The ferromagnetic core 3 is made of a ferromagnetic metal.

The surfaces of the upper clamping mechanism 14, the lower clamping mechanism 15 and the ferromagnetic core 3 are all provided with protective coatings; the protective coatings comprise a primer layer and a finish paint layer. The primer layer is made of epoxy zinc-rich primer; the material of the finish paint layer is aliphatic polyurethane or epoxy resin or silicon rubber. The primer layer also comprises an epoxy polyamide binder and a zinc powder filler. The surface paint layer is hydrophobic, and can effectively protect internal devices.

The material of the housing 12 is one or more insulating resins. The insulating resin is epoxy resin. The housing 12 may be formed using an open casting process or a vacuum casting process. The present design may be mounted to a pad on a common electrode or ground, adapted to be mounted outdoors, outside a building, not enclosed in a housing or any other type of protective housing. The housing 12 may also be formed in two layers of two different insulating resins. The outer shell is disposed on and coextensive with the inner shell. The inner shell is more flexible than the outer shell, the inner shell being composed of a flexible first resin composition, and the outer shell being composed of a rigid second resin composition. The housing 12 may be formed from a resin composition in Automatic Pressure Gelation (APG). In the casting process, each coil winding 2 is cast into resin so as to be enclosed in the case 12. Each coil winding 2 may be formed on a winding mandrel of a winding machine. Once the coil winding 2 has been completely wound, the coil winding 2 is taken out from the winding mandrel and then cast into an insulating resin forming the case.

A front supporting plate 13 is vertically arranged on the front side surface of the shell 12, and rear supporting plates are symmetrically arranged on the rear side surface; the upper end of the front supporting plate 13 is provided with a first high-voltage bushing 4, and the lower end of the front supporting plate is correspondingly provided with a second high-voltage bushing 5; the upper ends of the rear supporting plates are respectively provided with a first low-pressure sleeve 8, and the lower ends of the rear supporting plates are respectively correspondingly provided with a second low-pressure sleeve 9; the middle parts of the first low-voltage sleeves 8 are correspondingly provided with first low-voltage conductors 10; the middle parts of the second low-voltage sleeves 9 are correspondingly provided with second low-voltage conductors 11; the first low-pressure sleeve 8 and the second low-pressure sleeve 9 both extend outwards and are in a truncated cone shape with gradually reduced diameters;

the middle part of each transformer body 1 is provided with a core column penetrating through the center thereof. The high-voltage dome and the low-voltage dome are integrally connected to the transformer body 1 and extend in the axial direction thereof, the high-voltage dome and the low-voltage dome being disposed on opposite sides of the transformer body 1. A first high voltage bushing 4, a second high voltage bushing 5, respectively, extend from the high voltage dome, the first high voltage bushing 4 comprising a first high voltage body integrally joined with the high voltage dome, the second high voltage bushing 5 comprising a second high voltage body integrally joined with the high voltage dome, the first and second high voltage conductors extending through the first and second high voltage bodies, respectively.

A first low voltage bushing 8, a second low voltage bushing 9, respectively, extend from the low voltage dome, the first low voltage bushing 8 comprising a first low voltage body integrally joined with the low voltage dome, the second low voltage bushing 9 comprising a second low voltage body integrally joined with the low voltage dome, a first low voltage conductor 10, a second low voltage conductor 11, respectively, extending through the first low voltage body, the second low voltage body.

As shown in fig. 2, the high voltage dome, the low voltage dome, the first high voltage conductor, the second high voltage conductor the first high voltage body, the second high voltage body, the first low voltage body, the second low voltage body, the first low voltage conductor 10, the second low voltage conductor 11 are integrally formed together in a casting process.

The coil windings 2 comprise low-voltage windings 6 and high-voltage windings 7; the low-voltage windings 6 are all arranged inside the high-voltage windings 7, and the high-voltage windings 7 all extend inwards in the radial direction; the low-voltage winding 6 and the high-voltage winding 7 are concentrically arranged and are cylindrical or rectangular. The low-voltage windings 6 are sleeved on a core column consisting of two side yokes, the high-voltage windings 7 are respectively wound on each low-voltage winding 6 in an up-down adjacent mode, the high-voltage windings 7 wound on each low-voltage winding 6 are connected in series, each high-voltage winding 7 comprises a plurality of layers of high-voltage coils wound on the low-voltage windings 6, and the number of turns of each layer of high-voltage coil is gradually reduced along the direction from the annular structure to the outside; wherein the gap in the coil winding 2 is filled with epoxy resin; the epoxy resin is filled in the gap through pouring; the multilayer high-voltage coil wound on the low-voltage winding 6 has a trapezoidal cross section.

In the coil winding 2, there is no open space between the low voltage winding 6 and the high voltage winding 7, i.e. the low voltage winding 6 and the high voltage winding 7 are separated only by a high-low barrier layer, there is no cooling space or duct between any of the conductor layers of the low voltage winding 6 and the high voltage winding 7, wherein the end of the transformer body 1 is solid, wherein the end of the transformer body 1 has no openings or channels except for the core limb. An insulating or high and low barrier layer, which may be comprised of a relatively rigid dielectric plastic, is formed on the outermost conductor layer of the low voltage winding 6. The high and low barrier layer may be formed by a plurality of flexible insulating sheets wound on the outermost conductor layer. The flexible insulating sheet may be constructed of an insulating material such as polymer paper or kraft paper. The thickness of the high and low barrier layers, on which the high voltage winding 7 is wound, depends on the rating of the transformer body 1.

The utility model discloses a set up insulating resin shell, not only saved manufacturing cost, reduced the size of a dimension of transformer, need not encapsulate in the protective housing in addition, avoided liquid transformer to take place dielectric fluid simultaneously and spilled over the accident, avoided leading to the fact environmental problem. In addition, the outdoor dry-type transformer is simple in structure, practical and convenient, and can be widely applied to outdoor dry-type transformers.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and the technical personnel in the technical field are in the present invention, which can also belong to the protection scope of the present invention.

Claims

1. A dry-type transformer suitable for open air which characterized in that: the transformer comprises a three-phase transformer, wherein the three-phase transformer comprises three transformer bodies (1); heat dissipation holes are formed in the bottom of the transformer body (1); the transformer bodies (1) respectively comprise a shell (12), a coil winding (2) and a ferromagnetic core (3); the shells (12) are all sleeved outside the coil windings (2); the coil windings (2) are all sleeved outside the ferromagnetic core (3); the upper end of the ferromagnetic core (3) is provided with an upper clamping mechanism (14), and the lower end of the ferromagnetic core is correspondingly provided with a lower clamping mechanism (15); the lower end of the lower clamping mechanism (15) is provided with a base (16) in a matching way;

a front supporting plate (13) is vertically arranged on the front side surface of the shell (12), and rear supporting plates are symmetrically arranged on the rear side surface of the shell; the upper end of each front supporting plate (13) is provided with a first high-voltage bushing (4), and the lower end of each front supporting plate is correspondingly provided with a second high-voltage bushing (5); the upper ends of the rear supporting plates are respectively provided with a first low-pressure sleeve (8), and the lower ends of the rear supporting plates are respectively correspondingly provided with a second low-pressure sleeve (9); the middle parts of the first low-voltage sleeves (8) are respectively and correspondingly provided with a first low-voltage conductor (10); the middle parts of the second low-voltage sleeves (9) are correspondingly provided with second low-voltage conductors (11); the first low-pressure sleeve (8) and the second low-pressure sleeve (9) both extend outwards and are in a truncated cone shape with gradually reduced diameters;

the coil windings (2) comprise low-voltage windings (6) and high-voltage windings (7); the low-voltage windings (6) are all arranged inside the high-voltage windings (7), and the high-voltage windings (7) extend inwards in the radial direction;

the surfaces of the upper clamping mechanism (14), the lower clamping mechanism (15) and the ferromagnetic core (3) are all provided with protective coatings; the protective coating comprises a primer layer and a finish paint layer.

2. A dry transformer suitable for outdoor use as claimed in claim 1, wherein: the ferromagnetic cores (3) respectively comprise an upper iron yoke, a lower iron yoke and two side yokes; the lower iron yoke and the upper iron yoke are arranged oppositely left and right; the two side yokes are arranged oppositely up and down; two ends of the two side yokes are respectively connected with two ends of the upper iron yoke and the lower iron yoke to form an annular structure.

3. A dry transformer suitable for outdoor use as claimed in claim 2, wherein: the low-voltage winding (6) and the high-voltage winding (7) are concentrically arranged and are cylindrical or rectangular.

4. A dry transformer suitable for outdoor use as claimed in claim 3, wherein: and reinforcing ribs are arranged on the base (16).

5. Dry transformer according to claim 4, adapted for outdoor use, characterized in that: the primer layer is made of epoxy zinc-rich primer; the material of the finish paint layer is aliphatic polyurethane or epoxy resin or silicon rubber.

6. A dry transformer suitable for outdoor use as claimed in any one of claims 1 to 5, wherein: the material of the shell (12) is one or more insulating resins.