CN218826572U

CN218826572U - Grounding dry-type transformer

Info

Publication number: CN218826572U
Application number: CN202223441827.5U
Authority: CN
Inventors: 张江海; 顾克军; 沈秀晴; 刘扬; 杨晓洁; 徐英杰; 韦须鹏
Original assignee: Ztt Transformer Co ltd
Current assignee: Ztt Transformer Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-04-07
Anticipated expiration: 2032-12-22

Abstract

The utility model discloses a ground connection dry-type transformer belongs to power equipment technical field, in order to solve two independent coils in the current coil unit and make respectively and the complicated inconvenient problem of making of structure that leads to, ground connection dry-type transformer includes three coil unit (10), only contains in one coil unit (10) one upright perpendicular iron core (14), and perpendicular iron core (14) overcoat is equipped with insulating layer (19), and the cover is equipped with main winding (15) and moves phase winding (16) between perpendicular iron core (14) and insulating layer (19), and main winding (15) and move phase winding (16) upper and lower interval setting. The grounding dry-type transformer has the advantages that the two windings in one coil unit are axially arranged and connected through the iron core to form the integrated coil unit, so that a set of high-voltage coil mould is reduced, the pouring time is also reduced, and the production efficiency is improved.

Description

Grounding dry-type transformer

Technical Field

The utility model relates to a power equipment technical field, specificly a ground connection dry-type transformer.

Background

The 6kV, 10kV and 35kV power grids in the existing power system generally adopt a neutral point ungrounded operation mode, the low-voltage side of a main transformer in the power grid is generally in a triangular connection mode, no neutral point capable of being grounded exists, the capacitance current of the system to the ground is increased sharply along with the continuous expansion of an urban power grid and the continuous increase of cable outgoing lines, and when a single-phase grounding fault occurs in a neutral point ungrounded system, the current flowing through the fault point is also large, so that the insulation of power grid equipment is seriously threatened, and the safe operation of the power grid is threatened.

The existing high-voltage coil structure of the grounding transformer is mainly divided into two independent coils according to the radial direction for respective winding and respective casting, that is, two independent coils (each coil has an iron core) in one coil unit are wound and respectively cast, and then the two coils are connected by using auxiliary materials such as insulators, connecting rods and the like through a ZN-type connection method, as shown in fig. 1. Not only need make two moulds, increased mould cost and pouring time, also need increase a lot of auxiliary stand, insulator at the lead wire in-process, lead wire structure is more complicated, if handle not well, insulating distance arouses the discharge inadequately easily.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the complicated inconvenient manufacturing of structure that leads to of two independent coils difference independent manufacturing in the above-mentioned coil unit, the utility model provides a ground connection dry-type transformer, two winding axial arrangements in the ground connection dry-type transformer in with a coil unit are connected through an iron core, form the coil unit of integral type, when both having reduced one set of high-voltage coil mould, have also reduced the pouring time to production efficiency has been improved.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a ground connection dry-type transformer, includes three coil unit, only contains a vertical iron core in the coil unit, and vertical iron core overcoat is equipped with the insulating layer, and the cover is equipped with main winding and phase shift winding between vertical iron core and the insulating layer, and main winding and phase shift winding are upper and lower interval to be set up.

The main winding is in a left winding structure, and the phase-shifting winding is in a right winding structure.

The insulating layer is formed by pouring insulating resin, and the distance between the main winding and the phase-shifting winding is 7cm.

The three coil units are respectively a first coil unit, a second coil unit and a third coil unit, and the A end of the main winding of the first coil unit, the B end of the main winding of the second coil unit and the C end of the main winding of the third coil unit are all connected with copper bars.

The X end of the main winding of the first coil unit is connected with the Y ' end of the phase-shifting winding of the second coil unit through a copper rod, the Y end of the main winding of the second coil unit is connected with the Z ' end of the phase-shifting winding of the third coil unit through a copper rod, and the Z end of the main winding of the third coil unit is connected with the X ' end of the phase-shifting winding of the first coil unit through a copper rod.

The end A ' of the phase-shifting winding of the first coil unit, the end B ' of the phase-shifting winding of the second coil unit and the end C ' of the phase-shifting winding of the third coil unit are connected through copper columns, and the copper columns can be grounded.

The grounding dry-type transformer further comprises an upper iron core and a lower iron core which are arranged at an upper-lower interval, the upper end of the vertical iron core is connected with the upper iron core, and the lower end of the vertical iron core is connected with the lower iron core.

An axial channel is arranged in the vertical iron core, through holes are arranged in the upper iron core and the lower iron core, and the axial channel is communicated with the through holes.

The inner surface of the axial channel is provided with a heat radiating sheet which extends along the vertical direction.

The upper iron core or the lower iron core is provided with a blowing device which can blow air into the axial channel.

The utility model has the advantages that:

1. two windings in one coil unit are axially arranged and connected through one iron core to form an integrated coil unit, so that a set of high-voltage coil mould is reduced, the pouring time is also reduced, and the production efficiency is improved.

2. Lead wire structure has been simplified, uses 3 conducting rods to satisfy ZN type and connects the method, does not need additionally to increase fixed insulator and auxiliary stand, has simplified lead wire structure, has promoted transformer reliability of quality.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic front view of a prior art grounded dry-type transformer.

Fig. 2 is a schematic front view of the grounding dry-type transformer according to the present invention in embodiment 1.

Fig. 3 is a schematic diagram of the winding connection of the grounded dry-type transformer according to the present invention in embodiment 1.

Fig. 4 is a schematic winding diagram of the grounded dry-type transformer according to the present invention in embodiment 1.

Fig. 5 is a schematic sectional view of the grounded dry-type transformer according to the present invention in embodiment 2.

The reference numerals are illustrated below:

10. a coil unit; 11. a first coil unit; 12. a second coil unit; 13. a third coil unit; 14. erecting an iron core; 15. a main winding; 16. a phase-shifting winding; 17. an axial channel; 18. a heat dissipation sheet; 19. an insulating layer;

21. copper bars; 22. a copper rod; 23. a copper pillar; 24. an upper iron core; 25. a lower iron core; 26. a through hole; 27. and a blowing device.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

A grounding dry-type transformer comprises three coil units 10, wherein one coil unit 10 only comprises an upright vertical iron core 14, an insulating layer 19 is sleeved outside the vertical iron core 14, a main winding 15 and a phase-shifting winding 16 are sleeved between the vertical iron core 14 and the insulating layer 19, and the main winding 15 and the phase-shifting winding 16 are arranged at intervals up and down as shown in figures 2 to 5.

A coil unit 10 only contains one and erects iron core 14, a main winding 15 and one and moves phase winding 16, is in a coil unit 10, and outside one erected iron core 14 was located to main winding 15 and the equal cover of moving phase winding 16, coil unit 10 formula structure as an organic whole, ground connection dry-type transformer only contains 3 and erects iron core 14 and contains 6 and erect the iron core phase ratio with transformer among the prior art, has both reduced the time of one set of high-tension coil mould, has also reduced the pouring time to production efficiency has been improved.

In each coil unit 10, the main winding 15 and the phase-shifting winding 16 are both installed on a vertical iron core 14, the main winding 15 is located at the upper half section of the vertical iron core 14, the main winding 15 is in a left winding structure, the phase-shifting winding 16 is located at the lower half section of the vertical iron core 14, and as the head of the phase-shifting winding is exchanged, the phase-shifting winding 16 is in a right winding structure, which facilitates the lead wire, as shown in fig. 4.

After the main winding 15 and the phase-shift winding 16 are mounted on a vertical iron core 14, the vertical iron core is placed in a mold, and an insulating resin is poured into the mold, so that a coil unit 10 is formed, the insulating layer 19 is formed by pouring the insulating resin, and the distance between the main winding 15 and the phase-shift winding 16 is 7cm. Since the insulation between the two coils is pure resin insulation, the distance between the main winding 15 and the phase shift winding 16 is also reduced.

In the present embodiment, the three coil units 10 are a first coil unit 11, a second coil unit 12 and a third coil unit 13 in sequence from left to right, an a end of a main winding 15 of the first coil unit 11 is located at an upper end of the main winding 15 of the first coil unit 11, an X end of the main winding 15 of the first coil unit 11 is located at a lower end of the main winding 15 of the first coil unit 11, a B end of the main winding 15 of the second coil unit 12 is located at an upper end of the main winding 15 of the second coil unit 12, a Y end of the main winding 15 of the second coil unit 12 is located at a lower end of the main winding 15 of the second coil unit 12, a C end of the main winding 15 of the third coil unit 13 is located at an upper end of the main winding 15 of the third coil unit 13, and a Z end of the main winding 15 of the third coil unit 13 is located at a lower end of the main winding 15 of the third coil unit 13, as shown in fig. 2.

The X 'end of the phase-shift winding 16 of the first coil unit 11 is located at the upper end of the phase-shift winding 16 of the first coil unit 11, the a' end of the phase-shift winding 16 of the first coil unit 11 is located at the lower end of the phase-shift winding 16 of the first coil unit 11, the Y 'end of the phase-shift winding 16 of the second coil unit 12 is located at the upper end of the phase-shift winding 16 of the second coil unit 12, the B' end of the phase-shift winding 16 of the second coil unit 12 is located at the lower end of the phase-shift winding 16 of the second coil unit 12, the Z 'end of the phase-shift winding 16 of the third coil unit 13 is located at the upper end of the phase-shift winding 16 of the third coil unit 13, and the C' end of the phase-shift winding 16 of the third coil unit 13 is located at the lower end of the phase-shift winding 16 of the third coil unit 13.

In the present embodiment, the end a of the main winding 15 of the first coil unit 11, the end B of the main winding 15 of the second coil unit 12, and the end C of the main winding 15 of the third coil unit 13 are all connected with the copper bar 21, and the copper bar 21 is in an upright state, as shown in fig. 2.

In the present embodiment, the X-terminal of the main winding 15 of the first coil unit 11 and the Y ' -terminal of the phase-shift winding 16 of the second coil unit 12 are connected by a copper rod 22, the Y-terminal of the main winding 15 of the second coil unit 12 and the Z ' -terminal of the phase-shift winding 16 of the third coil unit 13 are connected by a copper rod 22, and the Z-terminal of the main winding 15 of the third coil unit 13 and the X ' -terminal of the phase-shift winding 16 of the first coil unit 11 are connected by a copper rod 22. The Z-shaped connection method can meet the requirement of a lead by using 3 conducting rods without adding an insulator and an auxiliary bracket.

In order to reduce the capacitance current to ground in the case of a single-phase earth fault, a compensation device such as an arc suppression coil needs to be installed at the neutral point of the transformer, so that a neutral point needs to be artificially established so as to access the arc suppression coil or the ground resistance at the neutral point, reduce the short-circuit current and improve the power supply reliability of the system.

In the present embodiment, the a 'end of the phase-shift winding 16 of the first coil unit 11, the B' end of the phase-shift winding 16 of the second coil unit 12, and the C 'end of the phase-shift winding 16 of the third coil unit 13 are connected by the copper pillar 23, and the copper pillar 23 can be grounded, i.e., when in use, the copper pillar 23 is grounded, and the a' end of the phase-shift winding 16 of the first coil unit 11, the B 'end of the phase-shift winding 16 of the second coil unit 12, and the C' end of the phase-shift winding 16 of the third coil unit 13 are all neutral points O, as shown in fig. 3.

In this embodiment, the grounding dry-type transformer further includes an upper iron core 24 and a lower iron core 25 which are arranged at an interval from top to bottom, the upper end of the vertical iron core 14 is connected with the upper iron core 24, and the lower end of the vertical iron core 14 is connected with the lower iron core 25. The vertical iron core 14 and the upper iron core 24 can be in a split structure or an integrated structure, and the vertical iron core 14 and the lower iron core 25 can be in a split structure or an integrated structure.

Example 2

This embodiment is an improvement of embodiment 1, and the difference between this embodiment and embodiment 1 is that in order to improve the heat dissipation effect, an axial channel 17 may be provided in the vertical core 14, and through holes 26 are provided in both the upper core 24 and the lower core 25, and the axial channel 17 communicates with the through holes 26. The axial passage 17 communicates with the outside of the grounded dry-type transformer through the through hole 26, air outside the grounded dry-type transformer can enter the axial passage 17 through the through hole 26, and air inside the axial passage 17 can also enter the outside of the grounded dry-type transformer through the through hole 26, as shown in fig. 5.

In order to further improve the heat dissipation effect, the inner surface of the axial passage 17 may be provided with heat fins 18, the heat fins 18 extending in a vertical direction. The upper iron core 24 or the lower iron core 25 is provided with a blowing device 27, and the blowing device 27 may be an existing fan, for example, the upper iron core 24 is provided with three fans which are in one-to-one correspondence with the through holes 26 of the upper iron core 24. The blowing device 27 is capable of blowing air into the axial channel 17, thereby accelerating the air flow between the axial channel 17 and the outside of the grounded dry-type transformer.

Other technical features of this embodiment are the same as those of embodiment 1, and this embodiment will not be described in detail for the sake of brevity.

For convenience of understanding and description, the present invention is described using an absolute positional relationship, where the orientation word "up" indicates an upper direction in fig. 2, the orientation word "down" indicates a lower direction in fig. 2, the orientation word "left" indicates a left direction in fig. 2, and the orientation word "right" indicates a right direction in fig. 2, unless otherwise specified. The present invention is described by using the observation angle of the reader, but the above-mentioned orientation words can not be understood or interpreted as the limitation of the protection scope of the present invention.

The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent. In addition, the utility model provides an between technical feature and the technical feature, between technical feature and technical scheme, technical scheme and technical scheme, embodiment and the embodiment all can the independent assortment use.

Claims

1. The grounding dry-type transformer is characterized by comprising three coil units (10), wherein one coil unit (10) only comprises one vertical iron core (14), an insulating layer (19) is sleeved outside the vertical iron core (14), a main winding (15) and a phase-shifting winding (16) are sleeved between the vertical iron core (14) and the insulating layer (19), and the main winding (15) and the phase-shifting winding (16) are arranged at intervals up and down.

2. An earthed dry transformer according to claim 1, characterised in that the main winding (15) is of left-hand configuration and the phase-shift winding (16) is of right-hand configuration.

3. Grounded dry-type transformer according to claim 1, characterized in that the insulating layer (19) is cast of insulating resin, the distance between the main winding (15) and the phase windings (16) being 7cm.

4. The grounded dry-type transformer according to claim 1, wherein the three coil units (10) are a first coil unit (11), a second coil unit (12) and a third coil unit (13), and a copper bar (21) is connected to the outside of the a terminal of the main winding (15) of the first coil unit (11), the B terminal of the main winding (15) of the second coil unit (12) and the C terminal of the main winding (15) of the third coil unit (13).

5. The grounded dry-type transformer according to claim 4, wherein the X terminal of the main winding (15) of the first coil unit (11) and the Y ' terminal of the phase-shift winding (16) of the second coil unit (12) are connected through a copper rod (22), the Y terminal of the main winding (15) of the second coil unit (12) and the Z ' terminal of the phase-shift winding (16) of the third coil unit (13) are connected through a copper rod (22), and the Z terminal of the main winding (15) of the third coil unit (13) and the X ' terminal of the phase-shift winding (16) of the first coil unit (11) are connected through a copper rod (22).

6. The grounded dry-type transformer according to claim 5, wherein the A ' terminal of the phase-shift winding (16) of the first coil unit (11), the B ' terminal of the phase-shift winding (16) of the second coil unit (12), and the C ' terminal of the phase-shift winding (16) of the third coil unit (13) are connected by a copper post (23), the copper post (23) being capable of being grounded.

7. The grounding dry-type transformer of claim 1, further comprising an upper iron core (24) and a lower iron core (25) which are arranged at an interval from top to bottom, wherein the upper end of the vertical iron core (14) is connected with the upper iron core (24), and the lower end of the vertical iron core (14) is connected with the lower iron core (25).

8. An earthed dry transformer according to claim 7, characterised in that an axial channel (17) is provided in the vertical core (14), that a through hole (26) is provided in both the upper core (24) and the lower core (25), and that the axial channel (17) communicates with the through hole (26).

9. Grounded dry-type transformer according to claim 8, characterized in that the inner surface of the axial channel (17) is provided with heat fins (18), the heat fins (18) extending in a vertical direction.

10. An earthed dry transformer according to claim 7, characterised in that the upper core (24) or the lower core (25) is provided with blowing means (27), the blowing means (27) being able to blow air into the axial channel (17).