Transformer winding radial oil gap structure and transformer
By setting an insulating layer and a pad in the wire cake of the transformer, an oil gap between the windings is formed, which solves the problem of increasing temperature rise of the transformer winding, and achieves the effect of reducing the temperature rise and preventing thermal damage of the insulating parts.
Patent Information
- Application Number
- CN202420515819.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-18
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-18
AI Technical Summary
As the transformer capacity increases, the large capacity of the winding bearing leads to an increase in the temperature rise of the winding, which in turn aggravates the thermal damage of the electromagnetic wire insulation layer and the aging of the insulating parts, affecting the safe operation of the transformer.
By providing an insulating layer and pads in the wire cake of the transformer, an oil gap between the windings is formed, the heat dissipation area of the electromagnetic wire is increased, the temperature difference between copper oil is reduced, and the temperature rise of the winding is reduced.
It effectively reduces the temperature rise of large transformers, prevents thermal damage and aging of insulators, and improves the safe operation and reliability of the transformer.
Smart Images
Figure CN222440322U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transformers, and in particular relates to a transformer winding radial oil gap structure and a transformer. Background Art
[0002] In recent years, with the increase in transformer capacity, the rated current of each transformer winding has also increased. When the winding carries a large capacity, the winding temperature rise increases accordingly.
[0003] The conventional oil gap structure of small transformers has a small heat dissipation area, which is not conducive to the heat dissipation of the winding, resulting in an increase in the temperature rise of the winding, which will aggravate the thermal damage of the electromagnetic wire insulation layer and the aging of the insulation parts, bringing hidden dangers to the safe operation of the transformer. It is particularly important to reduce the temperature rise of the transformer winding.
[0004] Therefore, a transformer winding radial oil gap structure and a transformer are provided to solve the above problems. Utility Model Content
[0005] In order to solve the above technical problems, the utility model proposes a transformer winding radial oil gap structure and a transformer, which can realize the cooperation of the insulating layer and the pad in the wire cake so that there is an oil gap between the windings, which can increase the heat dissipation area of the electromagnetic wire, reduce the copper-oil temperature difference, reduce the winding temperature rise, thereby reducing the temperature rise of large transformers, and effectively prevent thermal damage and aging of insulating parts.
[0006] To achieve the above object, the utility model provides a transformer winding radial oil gap structure, comprising:
[0007] An insulating layer, at least one of which is provided in the coil cake and is coated on the winding, wherein the insulating layer is configured to separate two adjacent windings;
[0008] A plurality of pads are circumferentially arranged on the outer wall of the insulating layer and fixed to the outer wall of the insulating layer. One end of the pad away from the insulating layer contacts another adjacent winding, so that an oil gap is formed between two adjacent pads.
[0009] Furthermore, it also includes a polyvinyl alcohol (PVA) adhesive layer, and the pad is bonded and fixed to the outer wall of the insulating layer through the polyvinyl alcohol (PVA) adhesive layer.
[0010] Furthermore, when the number of the insulating layers is not less than two, the insulating layer located on the outside is sleeved on the outside of the insulating layer located on the inside, and the winding is provided between two adjacent insulating layers.
[0011] Furthermore, the insulating layer is cable paper.
[0012] Furthermore, the distance between two adjacent pads located on the same insulating layer is the same.
[0013] Furthermore, the distance between two adjacent pads on the same insulating layer is 35 mm to 45 mm.
[0014] Furthermore, the length of the cushion block is 5 mm to 15 mm.
[0015] Furthermore, the cushion block has a thickness of 3 mm to 15 mm.
[0016] Furthermore, the thickness of the insulating layer is 0.2 mm to 0.3 mm.
[0017] A transformer comprises the above transformer winding radial oil gap structure.
[0018] Compared with the prior art, the utility model has the following advantages and technical effects:
[0019] The insulation layer and the spacer block are matched in the wire cake to create an oil gap between the windings, which can increase the heat dissipation area of the electromagnetic wire, reduce the copper-oil temperature difference, reduce the winding temperature rise, and thus reduce the temperature rise of large transformers, effectively preventing thermal damage and aging of insulation parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0021] Figure 1 It is a cross-sectional view of the oil gap structure;
[0022] Figure 2 It is a schematic diagram of the connection relationship between the insulating layer and the pad;
[0023] Among them, 1-insulating layer, 2-winding, 3-spacer, 4-polyvinyl alcohol (PVA) adhesive layer, 5-oil gap, 6-insulating tube. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0026] Reference Figure 1-Figure 2 The utility model provides a transformer winding radial oil gap structure, comprising: an insulating layer 1, at least one layer of which is arranged in a coil cake and wrapped on a winding 2, the insulating layer 1 being configured to separate two adjacent windings 2; a plurality of spacers 3, which are circumferentially arranged on the outer wall of the insulating layer 1 and fixed to the outer wall of the insulating layer 1, one end of the spacer 3 away from the insulating layer 1 contacts with another adjacent winding 2, so that an oil gap 5 is formed between the two adjacent spacers 3.
[0027] Specifically, a plurality of windings 2 cooperate to form a coil, in which an oil gap 5 is provided for the circulation of a heat dissipation medium, and an insulating layer 1 is coated on the inner winding 2, the insulating layer 1 is heat-conducting, and is used to separate the inner winding 2 from the outer winding 2.
[0028] Among them, there are multiple spacers 3, and they are circumferentially fixed on the outer wall of the insulating layer 1 away from the inner winding 2. The spacers 3 have a thickness so that there is a gap between the insulating layer 1 and the outer winding 2. The spaced air passages serve as oil gaps in the radial direction of the coil, and the air passages are used to pass the heat dissipation medium under the guidance of the spacers 3.
[0029] Among them, the oil gap height is equal to the electromagnetic wire height of winding 2, and the oil gap thickness direction, i.e., the thickness direction of pad 3, forms an oil gap in the radial direction of winding 2, which is used to meet the heat dissipation of winding 2 through oil flow. The oil gap length is determined according to the requirements of winding 2, and the number and thickness of oil gaps are determined according to the heat dissipation requirements of coil and transformer temperature rise requirements.
[0030] Among them, this oil gap structure is placed radially after the winding 2, and the structure is stable, which meets the tightness requirements of the wire coil in the radial and axial directions, increases the axial oil gap inside the winding 2, and forms a mixed oil gap together with the pad 3 between the winding 2 coils, making the oil flow heat dissipation channel smoother, effectively increasing the heat dissipation area of the radial hottest point, i.e., the radial middle part, and reducing the temperature rise of the winding.
[0031] The winding 2 is composed of at least one coil turn, for example, the number of turns of the coil of the winding is one turn, two turns, three turns, etc.
[0032] Furthermore, the innermost winding 2 is wrapped on the insulating cylinder 6 to support the winding 2 and form a complete coil structure.
[0033] In this embodiment, refer to Figure 2 , and also includes a polyvinyl alcohol (PVA) adhesive layer 4, through which the pad 3 is bonded and fixed to the outer wall of the insulating layer 1.
[0034] Specifically, the pad 3 is bonded and fixed on the insulating layer 1, and its adhesive adopts a polyvinyl alcohol PVA adhesive layer 4, which can ensure the bonding effect and prevent the bonding from falling off. The polyvinyl alcohol PVA adhesive is characterized by non-flowing, easy drying, high bonding strength, and good insulation performance, and can be applied to the complex working environment inside the transformer.
[0035] In this embodiment, refer to Figure 1 When the number of the insulating layers 1 is not less than two, the insulating layer 1 located on the outside is sleeved on the outside of the insulating layer 1 located on the inside, and a winding 2 is provided between two adjacent insulating layers 1 .
[0036] Specifically, according to actual heat dissipation requirements, one or more insulating layers 1 may be provided, thereby forming one or more oil gaps 5 in the wire cake.
[0037] In a specific embodiment of the present invention, referring to Figure 1 When two insulating layers 1 are provided, three windings 2 are provided, wherein one insulating layer 1 is used to separate the innermost winding 2 from the middle winding 2, and the other insulating layer 1 is used to separate the middle winding 2 from the outermost winding 2, so that two oil gaps 5 are formed in the coil.
[0038] In this embodiment, the insulating layer 1 is cable paper.
[0039] In a specific embodiment of the utility model, the cable paper adopts JZGDL-250 type. The cable paper JZGDL-250 type has good insulation performance and good rigidity strength, which can ensure that the oil gap structure of the utility model will not be twisted or wrinkled during production and use.
[0040] The cable paper and the cushion block 3 are bonded and fixed with a polyvinyl alcohol (PVA) adhesive layer 4, which is easy to process and has a simple structure. It does not deform or crack during vacuum drying and oil immersion, has a small shrinkage rate and high stability.
[0041] In this embodiment, refer to Figure 2 , the distance between two adjacent pads 3 located on the same insulating layer 1 is the same.
[0042] In this embodiment, the distance between two adjacent pads 3 on the same insulating layer 1 is 35 mm to 45 mm.
[0043] Specifically, the plurality of pads 3 on the insulating layer 1 are evenly distributed on the insulating layer 1 , so that the cross-sectional areas of the oil passages formed between two adjacent pads 3 are the same, thereby ensuring relatively uniform oil passage and achieving relatively uniform heat dissipation.
[0044] In a preferred embodiment of the present invention, referring to Figure 2 The distance A2 between two adjacent pads 3 is 40 mm.
[0045] In this embodiment, the length of the cushion block 3 is 5 mm to 15 mm.
[0046] In a preferred embodiment of the present invention, referring to Figure 2 , the length A1 of the pad 3 is 10 mm.
[0047] In this embodiment, the cushion block 3 has a thickness of 3 mm to 15 mm.
[0048] In a preferred embodiment of the present invention, referring to Figure 2 , the thickness t1 of the pad 3 is 5 mm.
[0049] In this embodiment, the thickness of the insulating layer 1 is 0.2 mm to 0.3 mm.
[0050] In a preferred embodiment of the present invention, referring to Figure 2 , the thickness t2 of the insulating layer 1 is 0.25 mm.
[0051] A transformer includes the above transformer winding radial oil gap structure. The winding radial oil gap structure in the large transformer can effectively increase the heat dissipation area of the electromagnetic wire, reduce the copper-oil temperature difference, reduce the winding temperature rise, thereby reducing the transformer temperature rise, and effectively prevent thermal damage to the electromagnetic wire insulation layer and aging of the insulation parts.
[0052] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A transformer winding radial oil gap structure, characterized in that: include: An insulating layer (1), at least one of which is arranged in the coil cake and is coated on the winding (2), wherein the insulating layer (1) is configured to separate two adjacent windings (2); A plurality of spacers (3) are circumferentially arranged on the outer wall of the insulating layer (1) and fixed to the outer wall of the insulating layer (1); one end of the spacer (3) away from the insulating layer (1) contacts another adjacent winding (2), so that an oil gap (5) is formed between two adjacent spacers (3).
2. The transformer winding radial oil gap structure according to claim 1, characterized in that: It also includes a polyvinyl alcohol (PVA) adhesive layer (4), and the pad (3) is bonded and fixed to the outer wall of the insulating layer (1) through the polyvinyl alcohol (PVA) adhesive layer (4).
3. The transformer winding radial oil gap structure according to claim 1, characterized in that: When the number of the insulating layers (1) is not less than two, the insulating layer (1) located on the outside is sleeved on the outside of the insulating layer (1) located on the inside, and the winding (2) is provided between two adjacent insulating layers (1).
4. The transformer winding radial oil gap structure according to any one of claims 1 to 3, characterized in that: The insulating layer (1) is cable paper.
5. The transformer winding radial oil gap structure according to claim 1, characterized in that: The distance between two adjacent pads (3) located on the same insulating layer (1) is the same.
6. The transformer winding radial oil gap structure according to claim 1, characterized in that: The distance between two adjacent pads (3) located on the same insulating layer (1) is 35 mm to 45 mm.
7. The transformer winding radial oil gap structure according to claim 1, characterized in that: The cushion block (3) has a length of 5 mm to 15 mm.
8. The transformer winding radial oil gap structure according to claim 1, characterized in that: The cushion block (3) has a thickness of 3 mm to 15 mm.
9. The transformer winding radial oil gap structure according to claim 1, characterized in that: The thickness of the insulating layer (1) is 0.2 mm to 0.3 mm.
10. A transformer, characterized in that: The invention comprises the transformer winding radial oil gap structure as described in any one of claims 1 to 9.