Oil-immersed transformer with interlayer insulation placement structure

Abstract

The utility model discloses an oil-immersed transformer with an interlayer insulation placement structure. The oil-immersed transformer comprises a plurality of winding coil units which are arranged layer by layer and are sequentially connected in series end to end. Each winding coil unit comprises insulation paper and a plurality of winding coil layers which are arranged in a stacked mode and are sequentially connected in series. Every two adjacent winding coil layers are isolated through insulation paper. According to the utility model, a plurality of pieces of complete insulation paper are sequentially wound on the initial winding layer, the first winding layer and the second winding layer. And the other half of the insulating paper covering the first winding layer is arranged below the second winding layer after layer rising, so that the number of the insulating paper between the second winding layer at a high voltage level after layer rising and the initial winding layer is twice of the number of the insulating paper between the first winding layer at a low voltage level and the initial winding layer. The grading insulation effect can be achieved while the insulation paper is not cut short, and the process step of cutting short paper is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-immersed transformers, and in particular relates to an oil-immersed transformer with an interlayer insulation placement structure. Background Art

[0002] In the prior art, oil-immersed transformers usually adopt a layered coil structure. Specifically, the layered coil structure is formed by winding electromagnetic wire layer by layer. There is a voltage difference between the layers. According to the calculation formula of the maximum working voltage between layers, U=2ne (n-number of turns per layer, e-voltage per turn), it can be seen that the voltage difference between the first turn of the coil and the last turn of the coil after the layer is raised is the largest, and the closer to the layer position, the smaller the voltage difference.

[0003] In order to reduce the radial size of the coil, the insulation between layers usually adopts graded insulation, that is, for each layer of coil turns, a corresponding number of insulating papers are laid. The number of interlayer insulation sheets is calculated according to the highest voltage. For two layers of coils with the same number of turns, the voltage of the coil on the lower layer is half of that on the upper layer. As a result, the coil on the upper layer needs to lay twice as much insulating paper as the coil on the lower layer. At the same time, in order to reduce the radial size of the coil, a stepped distribution is adopted between the upper and lower coils, so three long insulating papers and three short insulating papers need to be cut, and the three short insulating papers need to be placed on one side of the lower coil. This kind of insulating paper laying structure needs to be cut and laid according to the number of coil layers, which is very labor-intensive and resource-intensive. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides an oil-immersed transformer with an interlayer insulation placement structure to solve the technical problem that the insulating paper between the upper coil and the lower coil arranged in a stepped manner needs to be cut due to the different laying lengths.

[0005] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0006] An oil-immersed transformer with an interlayer insulation placement structure includes a plurality of winding coil units arranged layer by layer and connected in series end to end. The winding coil unit includes insulating paper and a plurality of winding coil layers stacked and connected in series. Two adjacent winding coil layers are isolated by insulating paper.

[0007] The winding coil layer has three layers, which are divided into a starting winding layer, a first winding layer and a second winding layer. A plurality of insulating papers are sequentially wound on the outer surfaces of the starting winding layer, the first winding layer and the second winding layer.

[0008] Furthermore, the first winding layer and the second winding layer are arranged in a stepped manner.

[0009] Furthermore, the winding lengths of the first winding layer and the second winding layer are both half of the winding length of the initial winding layer.

[0010] Furthermore, three sheets of insulating paper are laid between each two adjacent winding coil layers.

[0011] Furthermore, the winding coil unit is formed by winding an electromagnetic wire.

[0012] Furthermore, the thickness of the insulating paper is 0.08 mm.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model sequentially rolls a plurality of complete insulating papers on the starting winding layer, the first winding layer, and the second winding layer. The other half of the insulating paper covering the first winding layer is arranged under the second winding layer after the layer is raised, so that the number of insulating papers between the second winding layer at a high voltage and the starting winding layer after the layer is raised is twice the number of insulating papers between the first winding layer at a low voltage and the starting winding layer. The effect of graded insulation can be achieved without shortening the insulating paper, and the process steps of shortening the paper are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the winding coil unit of the utility model.

[0017] Figure numerals: 1, winding coil unit; 1-1, starting winding layer; 1-2, first winding layer; 1-3, second winding layer; 2, insulating paper. DETAILED DESCRIPTION

[0018] In the description of the present invention, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] The utility model will be further described below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, an oil-immersed transformer with an interlayer insulation placement structure includes a plurality of winding coil units 1 which are arranged layer by layer and connected in series end to end.

[0021] like Figure 2 As shown, the winding coil unit 1 includes insulating paper 2 and a plurality of winding coil layers parallel to each other and connected in series. Two adjacent winding coil layers are isolated by insulating paper 2. Three sheets of insulating paper 2 are laid between each two adjacent winding coil layers. The thickness of the insulating paper 2 is 0.08 mm.

[0022] In this embodiment, the winding coil layer is provided with three layers, which are divided into a starting winding layer 1-1, a first winding layer 1-2 and a second winding layer 1-3. The first winding layer 1-2 and the second winding layer 1-3 are arranged in a stepped manner, and the length of each is half of the length of the starting winding layer 1-1.

[0023] Specifically, the winding coil unit 1 is formed by winding an electromagnetic wire. When the electromagnetic wire is wound to form the starting winding layer 1-1, three sheets of insulating paper 2 are laid on the starting winding layer 1-1, that is, the insulating paper 2 wrapped in a cylindrical shape is wrapped around the starting winding layer, and the edges on both sides are against the electromagnetic wire at the end of the starting winding layer 1-1.

[0024] After the insulating paper 2 covering the starting winding layer 1-1 is completed, the electromagnetic wire continues to be wound and is set on the laid insulating paper 2. The electromagnetic wire is wound to half the length of the insulating paper 2 to form the first winding layer 1-2. Continue to lay three sheets of insulating paper 2, and continue to wind the second winding layer 1-3 after the laying is completed. This laying method allows three sheets of insulating paper 2 to be laid between the low-voltage first winding layer 1-2 and the starting winding layer 1-1; six sheets of insulating paper 2 are laid between the high-voltage second winding layer 1-3 and the starting winding layer 1-1; it can achieve the effect of graded insulation without shortening the insulating paper 2, reducing the process steps of shortening the insulating paper 2.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An oil-immersed transformer with an interlayer insulation placement structure, comprising a plurality of winding coil units (1) arranged layer by layer and connected in series end to end; the winding coil unit (1) comprises insulating paper (2) and a plurality of winding coil layers stacked and connected in series; two adjacent winding coil layers are isolated by the insulating paper (2), characterized in that: The winding coil layer has three layers in total, which are divided into a starting winding layer (1-1), a first winding layer (1-2) and a second winding layer (1-3); a plurality of insulating papers (2) are sequentially wound on the outer surfaces of the starting winding layer (1-1), the first winding layer (1-2) and the second winding layer (1-3).

2. The oil-immersed transformer with interlayer insulation placement structure according to claim 1, characterized in that: The first winding layer (1-2) and the second winding layer (1-3) are arranged in a stepped manner.

3. The oil-immersed transformer with interlayer insulation placement structure according to claim 1, characterized in that: The winding lengths of the first winding layer (1-2) and the second winding layer (1-3) are both half of the winding length of the starting winding layer (1-1).

4. The oil-immersed transformer with interlayer insulation placement structure according to claim 1, characterized in that: Three sheets of insulating paper (2) are laid between the starting winding layer (1-1) and the first winding layer (1-2), and between the first winding layer (1-2) and the second winding layer (1-3).

5. The oil-immersed transformer with interlayer insulation placement structure according to claim 1, characterized in that: The winding coil unit (1) is formed by winding an electromagnetic wire.

6. The oil-immersed transformer with interlayer insulation placement structure according to claim 1, characterized in that: The thickness of the insulating paper (2) is 0.08 mm.

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