CN210575493U

CN210575493U - Trapezoidal interlayer insulation structure

Info

Publication number: CN210575493U
Application number: CN201921636209.1U
Authority: CN
Inventors: 范利东; 范水明; 徐建军; 李英明; 吴振锋; 谢建灿
Original assignee: Quzhou Hangyong Transformer Co ltd
Current assignee: Quzhou Hangyong Transformer Co ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-05-19
Anticipated expiration: 2029-09-27

Abstract

The utility model discloses a trapezoidal interlayer insulation structure, which comprises a lead and an insulation layer, wherein the lead is wound on an iron core to form a coil, the insulation layer is wound between two layers of coils, and the insulation layer is formed by winding a strip-shaped insulation tape; the voltage difference between adjacent coils varies along the coil winding direction, and the thickness of the insulating layer between two coils of different voltage differences is different. The utility model discloses the voltage difference according to adjacent coil difference sets up the insulating layer of corresponding thickness for the transformer can not cause insulating waste between the layer when effective insulating between the layer, and reduce the overall structure of transformer.

Description

Trapezoidal interlayer insulation structure

Technical Field

The utility model relates to a transformer technical field specifically is an insulation system between trapezoidal layer.

Background

The high-voltage coil of the transformer is formed by winding a plurality of turns of conducting wires, one winding has a plurality of layers, and the number of turns can be greatly changed due to interlayer short circuit, so that in order to keep the electrical insulation strength among the conducting wires and avoid the breakdown short circuit of the upper and lower layers of conducting wires, insulating paper is required to be arranged between the conducting wires of each layer, and after the high-voltage coil is normally electrified and operated, voltage difference can be generated among the conducting wires of each turn. And taking the voltage difference of each turn as Ut and the turn number of each layer of wires as N, the voltage difference between the upper and lower layers of wires is increased in a step-like manner: the minimum voltage difference is Ut, and the maximum voltage difference is: 2 NxUt.

The traditional interlayer insulation paper is adopted for interlayer insulation of the high-voltage coil of the transformer on the market at present, the thickness of the interlayer insulation paper on the same layer is kept consistent with that of the highest voltage position according to the calculated interlayer highest voltage, the manufacturing cost of the interlayer insulation paper is increased, insulation waste at the low position of the interlayer voltage is caused, the using volume of the interior of the transformer is increased by using the traditional interlayer insulation paper, and the whole volume of the transformer is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a trapezoidal interlaminar insulation system sets up the insulating layer of corresponding thickness according to the different voltage difference of adjacent coil for the transformer can not cause the waste of interlaminar insulation when effective insulating between the layer, and reduce the overall structure of transformer.

In order to achieve the purpose of the invention, the utility model adopts the following technical scheme: a ladder-shaped interlayer insulation structure comprises a lead and an insulation layer, wherein the lead is wound on an iron core to form a coil, the insulation layer is wound between two layers of coils, and the insulation layer is formed by winding a strip-shaped insulation tape; the voltage difference between adjacent coils varies along the coil winding direction, and the thickness of the insulating layer between two coils of different voltage differences is different.

Preferably, the winding thickness of the insulating tape on the coil is greater than or equal to the actually required insulating thickness of the coil, so that the coil is sufficiently insulated, and the wire is prevented from being broken down and short-circuited.

Preferably, the insulating tape is made of an insulating paper tape with uniform width, so that winding is more uniform while production is convenient.

Preferably, the width of the insulating tape is greater than that of the wire, so that winding is more convenient.

Preferably, the insulating tape is provided with insulating paint for insulation.

Preferably, fixing portions for fixing the coil are arranged at two ends of the insulating layer, and a plurality of layers of insulating tapes are wound on the fixing portions.

Compared with the prior art, the trapezoidal interlayer insulation structure adopting the technical scheme has the following beneficial effects: adopt the utility model discloses an insulation system between trapezoidal layer through twine banded insulating tape between two-layer coil, according to the different voltage difference at the different positions of coil, twines the insulating tape of different numbers of turns, has avoided insulating waste between the layer, has saved insulating paper to the inside volume of transformer has been reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a trapezoidal interlayer insulating structure according to the present invention;

fig. 2 is a schematic cross-sectional view of the insulating structure between the trapezoidal layers in this embodiment.

Reference numerals: 1. a wire; 2. an insulating layer; 4. a coil; 6. an insulating tape; 7. a fixed part; 8. and (3) an iron core.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The structure of the ladder-shaped interlayer insulation structure shown in fig. 1 is schematically illustrated, and comprises a lead wire 1 and an insulation layer 2, wherein the lead wire 1 is wound on an iron core 8 to form a coil 4, and the insulation layer 2 is formed by winding a strip-shaped insulation tape 6; the voltage of the coils 4 in the same layer along the winding direction of the coils 4 is different, the voltage difference between the adjacent coils 4 changes along the winding direction of the coils 4, and the thickness of the insulating layer 2 between the two coils 4 with different voltage differences is different. In the present embodiment, the insulating tape 6 is an insulating paper tape having a uniform width, and the width of the paper tape is greater than that of the wire 1, so that the difficulty of winding the insulating tape 6 on the coil 4 is reduced, and the winding is more convenient. The insulating tape 6 is provided with insulating varnish for insulation.

As shown in fig. 2, which is a schematic cross-sectional view of a trapezoidal interlayer insulation structure, after a wire 1 is wound on an iron core 8 to form a layer of coil 4, insulation layers 2 with different thicknesses are wound on the coil 4 corresponding to different voltage differences, and the wire 1 is wound on the wound insulation layer 2, so that the insulation layer 2 is wound between the two layers of coil 4. Fixing portions 7 for fixing the coil 4 are provided at both ends of the insulating layer 2, and a plurality of layers of insulating tapes 6 are wound on the fixing portions 7, so that the wound coil 4 does not fall off from the insulating layer 2. The winding thickness of the insulating tape 6 on the coil 4 is larger than or equal to the actually required insulating thickness of the coil 4 with different voltage differences, so that the insulation is sufficient, and the short circuit caused by the breakdown of the lead 1 is avoided.

As shown in fig. 2, the wire 1 is wound in the vertical direction arrow direction, and the wire 1 is wound from below the iron core 8 in the dotted arrow direction, and the wound coil 4 is wound from right to left as shown by the horizontal arrow in the figure, forming the first layer coil 4. As indicated in fig. 2, assuming that the voltage difference per turn is Ut, the number of turns of each layer of coil 4 is N, after the first layer of coil 4 is wound from right to left, the insulating layer 2 is wound on the coil 4, and the second layer of coil 4 is wound from left to right, forming the second layer of coil 4. Therefore, the minimum voltage difference between the leftmost wires 1 of the first-layer coil 4 and the second-layer coil 4 is Ut, the maximum voltage difference between the rightmost wires 1 of the first-layer coil 4 and the second-layer coil 4 is 2NUt, and the voltage difference between the wires 1 of the upper-layer coil 4 and the lower-layer coil 4 increases in a step-like manner.

Different thickness's insulating layer 2 on according to the voltage difference winding of difference, when the voltage difference is the notch cuttype and increases progressively, corresponding insulating layer 2's thickness also is the notch cuttype and increases progressively, as shown in fig. 2, when using banded insulating tape 6 to wind, 4 horizontal windings of first layer coil are on iron core 8, turn right from a left side and be the notch cuttype and increase progressively insulating tape 6 on winding 4, second layer coil 4 is gone up in the winding of 2 step directions along insulating layer again, turn left at second layer coil 4 from the right side and be notch cuttype and increase progressively insulating tape 6 on the winding, make the coil 4 level winding once more of third layer, coil 4 and insulating layer 2 analogize and arrange in the transformer afterwards. The compact arrangement makes the space inside the transformer compact, saves the structure inside the whole transformer, and the structure of the transformer can be relatively smaller. In practical use, the coil 4 and the insulating layer 2 can be simultaneously wound on the iron core 8 according to the machine, reducing the time required for production.

The above is the preferred embodiment of the present invention, and a person skilled in the art can make several modifications and improvements without departing from the principle of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A trapezoidal interlayer insulation structure is characterized in that: the winding structure comprises a lead (1) and an insulating layer (2), wherein the lead (1) is wound on an iron core (8) to form a coil (4), the insulating layer (2) is wound between two layers of coils (4), and the insulating layer (2) is formed by winding a strip-shaped insulating tape (6); the voltage difference between adjacent coils (4) changes along the winding direction of the coils (4), and the thicknesses of the insulating layers (2) between the two coils (4) with different voltage differences are different.

2. The ladder type interlayer insulating structure of claim 1, wherein: the winding thickness of the insulating tape (6) on the coil (4) is larger than or equal to the actually required insulating thickness of the coil (4).

3. The ladder type interlayer insulating structure of claim 1, wherein: the insulating tape (6) is made of an insulating paper tape with uniform width.

4. The ladder type interlayer insulating structure of claim 3, wherein: the width of the insulating tape (6) is larger than that of the lead (1).

5. The ladder type interlayer insulating structure of claim 3, wherein: and insulating paint for insulation is arranged on the insulating tape (6).

6. The ladder type interlayer insulating structure of claim 1, wherein: the coil fixing structure is characterized in that fixing portions (7) used for fixing the coil (4) are arranged at two ends of the insulating layer (2), and multiple layers of insulating tapes (6) are wound on the fixing portions (7).