CN216133744U

CN216133744U - Foil coil for dry type transformer

Info

Publication number: CN216133744U
Application number: CN202122962342.XU
Authority: CN
Inventors: 张新根; 吴其亚
Original assignee: Wujiang Transformer Co Ltd
Current assignee: Wujiang Transformer Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-03-25
Anticipated expiration: 2031-11-29

Abstract

The utility model belongs to the technical field of transformers, and particularly relates to a foil type coil used in a dry type transformer. The multi-section type heat dissipation coil comprises a plurality of section foil type coils which are formed by winding copper foils with the same width and different thicknesses and are connected in parallel, the thickness of the copper foil of each section foil type coil is gradually reduced from top to bottom, and a plurality of supporting strips are arranged in each section foil type coil along the circumference of a winding to form a heat dissipation channel. Compared with the prior art, the technical scheme provided by the utility model has the following advantages: the improved foil type coil has more reasonable material distribution, reduced temperature difference between the upper part and the lower part, more balanced temperature of the whole coil and reduced manufacturing cost of the transformer.

Description

Foil coil for dry type transformer

Technical Field

The utility model belongs to the technical field of transformers, and particularly relates to a foil type coil used in a dry type transformer.

Background

The low-voltage winding of the transformer, especially the epoxy cast low-voltage winding of the transformer, usually use the whole copper foil to coil and form the foil coil, the eddy current loss of the copper foil is greater, namely the temperature rise is obvious, the dry-type transformer is generally insulated with resin, lean on the natural air cooling, therefore compare with the oil type transformer, it is more difficult to dispel the heat.

The temperature rise of the coil is an important technical parameter of the transformer and must meet relevant standards.

As shown in fig. 1, the low voltage foil coil of the dry transformer is formed by continuously winding a whole copper foil 10, and in order to dissipate heat, a stay 20 is disposed in the middle of the copper foil to form a heat dissipating air duct penetrating up and down.

When the coil height is higher, cooling air gets into, the upper portion flows out from the coil lower part, and the heat that lower part coil gived off this moment is taken to the upper portion coil, leads to lower part temperature higher than upper portion temperature, in order to guarantee that the transformer accords with the standard, must guarantee that the upper portion temperature rise meets the requirements, has increased control degree of difficulty and cost in the middle of intangible.

SUMMERY OF THE UTILITY MODEL

The utility model provides a temperature raising device for solving the problem of uneven temperature rise at present.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the foil type coil used in the dry type transformer comprises a plurality of segmented foil type coils which are formed by winding copper foils with the same width and different thicknesses and are connected in parallel, the thickness of the copper foil of each segmented foil type coil is gradually reduced from top to bottom, and a plurality of supporting strips are arranged in each segmented foil type coil along the circumference of a winding to form a heat dissipation channel.

Since the widths of the copper foils are the same from top to bottom and the thicknesses of the copper foils are gradually reduced, the resistances of the segmented foil coils from top to bottom are gradually increased, and the flowing currents are basically the same, so that the heat productivity of the segmented foil coils from top to bottom is gradually increased, the temperature difference between the upper coil and the lower coil is reduced when cooling air enters from the lower part of the coil and flows out from the upper part of the coil, and the temperature of the whole coil is more balanced.

Optionally, the stays run through all the segmented foil coils from top to bottom.

Optionally, thicknesses of portions of the stays located in each segmented foil coil are different, and a sum of the thicknesses of the stays and the thicknesses of the corresponding segmented foil coils is not changed.

Optionally, the stays are formed by base strips and insulating plates that fill the thickness of the corresponding segmented foil coil.

Optionally, the insulation panels include an inner insulation panel located inside the base strip and an outer insulation panel located outside the base strip.

Optionally, the head ends of the segmented foil coils are respectively connected with the first outgoing line copper bars, and the tail ends of the segmented foil coils are respectively connected with the second outgoing line copper bars.

Optionally, the first outgoing line copper bar and the second outgoing line copper bar are arranged in parallel and located on the outer side and the inner side of the same position of the foil coil.

Compared with the prior art, the technical scheme provided by the utility model has the following advantages: the improved foil type coil has more reasonable material distribution, reduced temperature difference between the upper part and the lower part, more balanced temperature of the whole coil and reduced manufacturing cost of the transformer.

Drawings

Fig. 1 is a schematic structural diagram of a low-voltage foil coil of a dry-type transformer in the background art;

fig. 2 is a schematic structural view of a foil coil used in a dry type transformer according to embodiment 1;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a schematic view of the structure of the stay of example 1;

FIG. 5 is an enlarged view of portion A of FIG. 2;

FIG. 6 is a schematic view of the structure of one mode of providing a plurality of turns of the stay according to example 2;

FIG. 7 is a schematic view showing the structure of another mode of the stay of example 2 in which a plurality of turns are provided.

Shown in the figure:

in the background art: 10-copper foil, 20-stay;

in example 1 or 2: 11-upper segmented foil coil, 12-lower segmented foil coil, 20-stay, 21-basic strip, 22-inner insulating plate, 23-outer insulating plate, 30-heat dissipation air channel, 41-first outlet copper bar and 42-second outlet copper bar.

Detailed Description

For ease of understanding, the dry-type transformer low voltage foil coil is described below with reference to examples, which are to be understood as merely illustrative and not limiting the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixed or detachably or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 2, the foil-type coil used in the dry-type transformer includes an upper sectional foil-type coil 11 and a lower sectional foil-type coil 12 formed by winding copper foils having the same width and different thicknesses, wherein the thickness of the copper foil used for the upper sectional foil-type coil 11 is greater than that of the copper foil used for the lower sectional foil-type coil 12.

As shown in fig. 3, a plurality of struts 20 are disposed along the circumference of the winding in the segmented foil coil to form heat dissipation channels 30.

As shown in fig. 4, the stay 20 includes a base strip 21, an inner insulating plate 22 attached to an inner side of the base strip 21, and an outer insulating plate 23 attached to an outer side of the base strip 21, and as shown in fig. 5, the sum of the thickness of the stay 20 plus the thickness of the corresponding segmented foil coil is constant from top to bottom.

With continued reference to fig. 2 and 3, the head ends of the upper sectional foil coil 11 and the lower sectional foil coil 12 are respectively connected to a first outgoing line copper bar 41, the upper sectional foil coil 11 and the lower sectional foil coil 12 are respectively connected to a second outgoing line copper bar 42, that is, the upper sectional foil coil 11 and the lower sectional foil coil 12 are connected in parallel, and the first outgoing line copper bar 41 and the second outgoing line copper bar 42 are arranged in parallel and located on the outer side and the inner side of the foil coil at the same position.

Example 2

The difference from embodiment 1 is that the stay 20 is not provided with only one turn but with a plurality of turns in the foil coil as in embodiment 1. The specific arrangement mode takes two circles as an example, and the process can be analogized by arranging more circles.

First, as shown in fig. 6, in the foil coil, two layers of struts 20 are arranged, the one-to-one corresponding positions of the two layers of struts 20 are arranged from inside to outside, at this time, in order to ensure that the thicknesses of the whole foil coil from top to bottom are consistent, the inner insulating plate and the outer insulating plate of each turn of struts 20 need to be respectively calculated and matched, and the total thickness of the inner insulating plate and the outer insulating plate of a plurality of turns of struts is equal to the total thickness difference between the upper layer foil coil and the lower layer foil coil.

Secondly, as shown in fig. 7, two layers of struts 20 are disposed in the foil coil, and the two layers of struts 20 do not correspond to each other in one-to-one position, but appear in a staggered manner, and similarly, the inner insulating plate and the outer insulating plate of each turn of struts 20 need to be calculated and matched respectively, and the method is consistent with the above method, and is not described again.

Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and such modifications or replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The foil type coil is characterized by comprising a plurality of segmented foil type coils which are formed by winding copper foils with the same width and different thicknesses and connected in parallel, the thickness of the copper foil of each segmented foil type coil is gradually reduced from top to bottom, and a plurality of supporting strips are arranged in each segmented foil type coil along the circumference of a winding to form a heat dissipation channel.

2. Foil coil for use in dry transformers according to claim 1, characterised in that the stays run through all segmented foil coils from top to bottom.

3. Foil coil for use in a dry transformer according to claim 2, wherein the thickness of the inner part of the stays located in each segmented foil coil is different, and the sum of the stay thickness plus the thickness of the corresponding segmented foil coil is constant.

4. Foil coil for use in dry transformers according to claim 3, characterised in that the stays are constituted by base strips and insulation plates filling the thickness of the corresponding segmented foil coil.

5. Foil-type coil for use in a dry-type transformer according to claim 4, wherein said insulation plates include an inner insulation plate located inside the base strip and an outer insulation plate located outside the base strip.

6. The foil coil used in the dry type transformer according to claim 1, wherein the head ends of the segmented foil coil are respectively connected with the first outgoing line copper bar, and the tail ends of the segmented foil coil are respectively connected with the second outgoing line copper bar.

7. Foil coil for use in dry transformers according to claim 6, wherein said first outgoing copper bar is arranged in parallel with said second outgoing copper bar, outside and inside the same position of the foil coil.