CN212542162U

CN212542162U - Power transformer with thickness voltage regulation structure

Info

Publication number: CN212542162U
Application number: CN202020965155.XU
Authority: CN
Inventors: 李林达; 王仁; 迟主升
Original assignee: Siemens Transformer Guangzhou Co Ltd
Current assignee: Guangzhou Siemens Energy Transformer Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-02-12
Anticipated expiration: 2030-05-29

Abstract

The utility model relates to a power transformer field provides a power transformer with thickness pressure regulating structure, and this thickness pressure regulating structure is including the winding of waiting to transfer that needs the pressure regulating for the coarse tuning winding and the fine tuning winding of pressure regulating, wherein the coarse tuning winding is including being located the two parts coarse tuning winding of waiting to transfer the axial both ends of winding respectively, and the fine tuning winding is including being located the two parts fine tuning winding in the radial outside of waiting to transfer winding and coarse tuning winding. The coarse tuning winding is positioned at the two axial ends of the winding to be tuned instead of the radial outer side, so that the radial space of the transformer is saved, and the radial size of the transformer can be reduced. And because the fine tuning winding comprises two parts of fine tuning windings, the outgoing line of the winding to be tuned with higher voltage can be led out from the axial middle part instead of the axial end part, and is far away from the shell of the transformer and far away from the electric field distortion area of the end part, so that the insulation structure at the axial end part of the transformer can be simplified, and the safe insulation distance can be correspondingly reduced.

Description

Power transformer with thickness voltage regulation structure

Technical Field

The utility model relates to a power transformer field specifically, relates to a power transformer with thickness pressure regulating structure.

Background

On-load voltage regulation is a voltage regulation mode in which a power transformer can change voltage by changing tap gears when running under load. The on-load voltage regulation mainly comprises linear voltage regulation, positive and negative voltage regulation and coarse and fine voltage regulation modes, and a large power transformer usually adopts the coarse and fine voltage regulation mode. Fig. 1 shows the arrangement of windings in a conventional on-load coarse and fine voltage regulating power transformer, and as shown in the figure, a winding 10 to be regulated, which needs to be regulated, a coarse regulating winding 20 and a fine regulating winding 30 for regulating voltage are sequentially arranged in a radial direction from an iron core C of the transformer, in such a winding arrangement structure, since the coarse regulating winding 20 and the fine regulating winding 30 both occupy a radial space and a certain insulation distance needs to be maintained between the windings, the radial dimension of the transformer is large. In addition, in the winding arrangement structure, since the coarse adjustment winding 20 and the fine adjustment winding 30 surround the winding 10 to be adjusted, the lead line L of the winding 10 to be adjusted can only be led out from the axial end direction, while the voltage of the winding 10 to be adjusted is generally high, when the lead line L is led out from the axial end, the lead line L is closer to the shell of the transformer, and the shape of the coil end determines that the lead line L is in a distortion area with non-uniform electric field, so that the requirement on the insulation performance of the axial end of the transformer is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the problem that exists among the above prior art, provide an on-load voltage regulation power transformer with thickness voltage regulation structure, in this thickness voltage regulation structure, coarse adjusting winding is including being located the two parts coarse adjusting winding of waiting to transfer the axial both ends of winding respectively, and fine adjusting winding is including being located the two parts fine adjusting winding in the radial outside of waiting to transfer winding and coarse adjusting winding. The coarse tuning winding is positioned at the two axial ends of the winding to be tuned instead of the radial outer side, so that the radial space of the transformer is saved, and the radial size of the transformer can be reduced. And because the fine tuning winding comprises two parts of fine tuning windings, the outgoing line of the winding to be tuned with higher voltage can be led out from the axial middle part instead of the axial end part, and is far away from the shell of the transformer and far away from the electric field distortion area of the end part, so that the insulation structure at the axial end part of the transformer can be simplified, and the safe insulation distance can be correspondingly reduced.

The utility model provides a power transformer with thickness pressure regulating structure, power transformer's thickness pressure regulating structure includes:

the winding to be adjusted is wound on an iron core of the power transformer and comprises a first winding to be adjusted and a second winding to be adjusted which are connected in parallel, and the first winding to be adjusted and the second winding to be adjusted are arranged along the axial direction of the power transformer;

the coarse tuning winding is wound on the iron core and comprises a first coarse tuning winding and a second coarse tuning winding which are connected in parallel, the first coarse tuning winding is electrically connected with the first winding to be tuned and is positioned on one side of the first winding to be tuned, which is far away from the second winding to be tuned, and the second coarse tuning winding is electrically connected with the second winding to be tuned and is positioned on one side of the second winding to be tuned, which is far away from the first winding to be tuned;

a fine tuning winding wound on the iron core and disposed outside the to-be-tuned winding and the coarse tuning winding in a radial direction of the power transformer, the fine tuning winding including a first fine tuning winding and a second fine tuning winding connected in series or in parallel with each other, the first fine tuning winding being electrically connected to the first coarse tuning winding, the second fine tuning winding being electrically connected to the second coarse tuning winding.

According to a preferred embodiment of the present invention, the winding to be regulated is any one of a high voltage winding, a medium voltage winding and a low voltage winding.

According to the utility model discloses a preferred embodiment, first fine tuning winding with be provided with the insulating part between the second fine tuning winding, the first outgoing line that waits to transfer the winding with the second is waited to transfer the winding is located first waiting to transfer the winding with the second is waited to transfer between the winding and is followed radial passes draw-off hole in the insulating part extends to the outside of fine tuning winding.

According to a preferred embodiment of the invention, the insulation comprises laminated paper board.

Drawings

The following drawings are intended to be illustrative only and not limiting to the scope of the invention, wherein:

fig. 1 shows a schematic diagram of a partial winding arrangement in a conventional on-load tap changing power transformer using a coarse-fine voltage regulation method.

Fig. 2 schematically shows a partial schematic view of a coarse and fine voltage regulation structure for an on-load tap changing power transformer according to a preferred embodiment of the present invention.

Reference numerals: 10-winding to be regulated; 20-coarse winding; 30-fine tuning of the winding; c, iron core; l-lead-out wire; 11-a first winding to be regulated; 12-a second winding to be regulated; 21 — a first coarse tuning winding; 22 — second coarse tuning winding; 31 — first fine tuning winding; 32-second fine tuning winding; c1 — iron core; l1 — pinout; l2-lead-out 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, wherein the same reference numerals in the drawings denote the same components or similar components.

For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, for simplicity and clarity of understanding, only one of the components having the same structure or function is schematically illustrated or labeled in some of the drawings.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

In this context, "radial direction" means a radial direction in which the core of the transformer is a center, i.e., a left-right direction in the drawing, and "axial direction" means an extending direction of the core of the transformer, i.e., an up-down direction in the drawing.

As shown in fig. 2, the fine and fine voltage regulating structure of the power transformer according to the preferred embodiment of the present invention includes a winding to be regulated, for example, a secondary winding, a coarse regulating winding and a fine regulating winding for regulating voltage, wherein the coarse regulating winding includes two portions of coarse regulating

windings

21 and 22 respectively located at both axial ends of the winding to be regulated, the fine regulating winding includes two portions of fine regulating

windings

31 and 32 located at radial outer sides of the winding to be regulated and the coarse regulating winding, and the winding to be regulated may be any one of a high voltage winding, a medium voltage winding and a low voltage winding.

Specifically, the winding to be regulated is wound on the iron core C1 and includes a first winding to be regulated 11 and a second winding to be regulated 12, the first winding to be regulated 11 and the second winding to be regulated 12 being connected in parallel with each other, wherein the first winding to be regulated 11 and the second winding to be regulated 12 are arranged in the axial direction and the first winding to be regulated 11 is located above the second winding to be regulated 12. The coarse tuning winding is wound on the iron core C1 and includes a first coarse tuning winding 21 and a second coarse tuning winding 22 connected in parallel with each other, wherein the first coarse tuning winding 21 is electrically connected to the first winding to be tuned 11 and located above the first winding to be tuned 11, and the second coarse tuning winding 22 is electrically connected to the second winding to be tuned 12 and located below the second winding to be tuned 12. The fine winding is wound around the core C1 and includes a first fine winding 31 and a second fine winding 32, which may be connected in series or in parallel with each other. The first fine tuning winding 31 is located on the radial outer side of the first to-be-tuned winding 11 and the first coarse tuning winding 21, the second fine tuning winding 32 is located on the radial outer side of the second to-be-tuned winding 12 and the second coarse tuning winding 22, the first fine tuning winding 31 is electrically connected with the first coarse tuning winding 21, the second fine tuning winding 32 is electrically connected with the second coarse tuning winding 22, the first fine tuning winding 31 and the second fine tuning winding 32 are arranged along the axial direction, and the first fine tuning winding 31 is located above the second fine tuning winding 32.

In a preferred embodiment of the present invention, an insulating member such as a laminated paper board is provided between the first fine winding 31 and the second fine winding 32, the insulating member is formed with an extraction hole, and the extraction line L1 of the first winding to be regulated 11 and the extraction line L2 of the second winding to be regulated 12 may be provided at an axially intermediate position therebetween and may be capable of extending to the radially outer side of the

fine windings

31 and 32 through the extraction hole in the insulating member.

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

1. The utility model provides a power transformer with thickness pressure regulating structure which characterized in that, power transformer's thickness pressure regulating structure includes:

a winding to be regulated, which is wound on a core (C1) of the power transformer and comprises a first winding to be regulated (11) and a second winding to be regulated (12) which are connected in parallel with each other, the first winding to be regulated (11) and the second winding to be regulated (12) being arranged along the axial direction of the power transformer;

a coarse adjusting winding and a fine adjusting winding which adjust the voltage of the output of the winding to be adjusted, wherein the coarse adjusting winding is wound on the iron core (C1) and comprises a first coarse adjusting winding (21) and a second coarse adjusting winding (22) which are connected in parallel with each other, the first coarse adjusting winding (21) is electrically connected with the first winding to be adjusted (11) and is positioned on one side of the first winding to be adjusted (11) far away from the second winding to be adjusted (12), and the second coarse adjusting winding (22) is electrically connected with the second winding to be adjusted (12) and is positioned on one side of the second winding to be adjusted (12) far away from the first winding to be adjusted (11); a fine tuning winding wound on the core (C1) and disposed outside the to-be-tuned winding and the coarse tuning winding in a radial direction of the power transformer, the fine tuning winding including a first fine tuning winding (31) and a second fine tuning winding (32) connected in series or in parallel with each other, the first fine tuning winding (31) being electrically connected to the first coarse tuning winding (21), the second fine tuning winding (32) being electrically connected to the second coarse tuning winding (22).

2. The power transformer with the coarse and fine voltage regulation structure according to claim 1, wherein an insulator is provided between the first fine winding (31) and the second fine winding (32), and an outgoing line (L1) of the first winding to be regulated (11) and an outgoing line (L2) of the second winding to be regulated (12) are located between the first winding to be regulated (11) and the second winding to be regulated (12) and extend to one side of the fine winding in the radial direction through an outgoing hole in the insulator.

3. The power transformer with the coarse and fine voltage regulating structure as recited in claim 2, wherein said insulating member comprises a laminated paper board.