A transformer body and a transformer
By using insulating materials to make transformer clamps, the problems of complex insulation distance and high loss in medium frequency transformers have been solved, resulting in smaller transformer size, lower cost, and improved performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TBEA INTELLIGENT ELECTRIC CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-30
AI Technical Summary
Existing medium-frequency transformers suffer from complex insulation distances, large tank volume, and high cost due to the conductivity of steel clamps, as well as high eddy current and stray losses, which affect performance and efficiency.
Insulating materials such as mica board, laminated paperboard or laminated wood board are used to make upper and lower clamps to form insulating clamps, which reduces the insulation distance of windings and leads, simplifies the structure and reduces eddy current and stray losses.
This will enable transformers to be smaller, less expensive, perform better, operate more efficiently, and be more competitive in the market.
Smart Images
Figure CN224437352U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of transformer manufacturing, and particularly to a transformer body and a transformer. Background Art
[0002] With the continuous development of China's power transmission and transformation technology, the types and forms of power transmission and transformation are constantly updated. Especially in the new energy photovoltaic power generation market, the application of DC transmission transformers for new energy photovoltaic power generation is also increasing. As an important part of DC transmission transformers, the cost, performance, etc. of intermediate-frequency transformers directly affect the development and application of products in the market. Utility Model Content
[0003] This application proposes a transformer body to reduce the cost of the transformer, optimize the performance of the transformer, and improve the market competitiveness of the transformer. This application also proposes a transformer including the above-mentioned transformer body.
[0004] To achieve the above object, this application provides a transformer body, including an iron core, windings, an upper clamping piece, and a lower clamping piece;
[0005] The windings are wound around the core column of the iron core;
[0006] The upper clamping piece and the lower clamping piece are respectively located at the upper and lower ends of the windings, and the upper clamping piece and the lower clamping piece are connected to compress the windings;
[0007] The upper clamping piece and the lower clamping piece are insulating clamping pieces.
[0008] Preferably, in the above-mentioned transformer body, the upper clamping piece includes two upper clamping plates arranged in parallel and an upper side plate located between the two upper clamping plates. The two ends of the upper side plate are connected to the two upper clamping plates, and the plane where the upper clamping plates and the upper side plate are located is parallel; and / or,
[0009] The lower clamping piece includes two lower clamping plates arranged in parallel and a lower side plate located between the two lower clamping plates. The two ends of the lower side plate are connected to the two lower clamping plates, and the plane where the lower clamping plates and the lower side plate are located is parallel.
[0010] Preferably, in the above-mentioned transformer body, it further includes an insulating tie strap;
[0011] The insulating tie strap is sleeved outside the frame formed by the upper clamping piece and the lower clamping piece, and the insulating tie strap is used to apply a compression force to the frame.
[0012] Preferably, in the above-mentioned transformer body, a limiting groove is provided on one side of the lower clamping piece that cooperates with the insulating tie strap, and the insulating tie strap is located in the limiting groove.
[0013] Preferably, the transformer body further includes a U-shaped screw, which is located within the limiting groove. The closed end of the U-shaped screw engages with the insulating pull strip, and the threaded section of the U-shaped screw is connected to the pad of the transformer body.
[0014] Preferably, in the above-mentioned transformer body, the upper clamp, the lower clamp, and the pad of the transformer body are connected by screws for locking.
[0015] Preferably, in the transformer body described above, the upper clamp and the lower clamp are at least one of mica board, laminated paperboard and laminated wood board.
[0016] A transformer includes a transformer body and a transformer tank, wherein the transformer body is located in the transformer tank;
[0017] The transformer body is the transformer body described in any of the above schemes.
[0018] Preferably, in the above-mentioned transformer, the pad of the transformer body is a metal plate;
[0019] The pad is connected to the transformer oil tank.
[0020] Preferably, in the above-mentioned transformer, the transformer is a single-phase transformer or a three-phase transformer.
[0021] The transformer body provided in this application includes a core, windings, an upper clamp, and a lower clamp. The upper and lower clamps of the transformer body disclosed in this solution are made of insulating material, forming insulating clamps. By using insulating clamps in the transformer body, the insulation distance from the windings and leads to the clamps can be significantly reduced, or even eliminated, thus reducing the volume of the transformer body, consequently the size of the transformer tank, reducing the amount of transformer oil used, and lowering the transformer cost. Simultaneously, the effects of high-frequency electromagnetic fields and currents acting on the steel upper and lower clamps are not generated within the insulating material clamps, reducing eddy current losses and stray losses in the steel clamps to near zero. This significantly improves the transformer's performance and operating efficiency, resulting in more pronounced energy savings.
[0022] This application also provides a transformer, including the transformer body described in any of the above-mentioned solutions. Since the transformer body has the above-mentioned technical effects, the transformer having the transformer body also has the same technical effects, which will not be repeated here. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and this application can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.
[0024] Figure 1 This is a schematic diagram of the transformer structure provided in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram of the transformer body provided in an embodiment of this application;
[0026] Figure 3 This is a top view of the transformer body provided in the embodiments of this application.
[0027] in:
[0028] 1-Iron core; 2-Winding; 3-Upper clamp; 31-Upper clamp plate; 32-Upper side plate; 4-Lower clamp; 41-Limiting groove; 5-Insulating pull strap; 6-U-shaped screw; 7-Padded plate; 8-Tightening screw. Detailed Implementation
[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. The described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort are within the scope of protection of the present application.
[0030] It should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0031] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used in this application are a method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.
[0032] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.
[0033] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.
[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
[0035] Since transformers operate in high-voltage, high-magnetic-field environments, insulation distance is the primary consideration for transformers.
[0036] In related technologies, the upper and lower clamps of transformers are generally made of steel. Since steel is conductive, the insulation distance from the windings and leads to the upper and lower clamps needs to be considered when designing the transformer body. This results in a more complex lead structure. At the same time, a larger insulation distance will increase the volume of the tank and increase the cost.
[0037] In addition, in a high-frequency electromagnetic field environment, large eddy current losses and stray losses will be generated in the upper and lower clamps of steel parts, thereby increasing transformer energy consumption and reducing transformer performance efficiency.
[0038] like Figure 1 The diagram shown is a structural schematic of the transformer disclosed in this application, including the transformer body and the transformer oil tank. The transformer oil tank is filled with transformer oil, and the transformer body is immersed in the transformer oil in the transformer oil tank.
[0039] Transformer oil can be mineral oil, vegetable oil, synthetic ester oil, or other insulating oil.
[0040] The transformer body includes an iron core 1, windings 2, upper clamping parts 3 and lower clamping parts 4.
[0041] Winding 2 is wound on the core column of core 1. Upper clamp 3 is located at the upper end of winding 2, and lower clamp 4 is located at the lower end of winding 2. Upper clamp 3 and lower clamp 4 are connected and press winding 2 together to ensure that the short-circuit withstand performance of winding 2 meets the requirements.
[0042] The upper clamp 3 and the lower clamp 4 securely fix the iron core 1.
[0043] The upper clamp 3 and lower clamp 4 of the transformer body disclosed in this solution are made of insulating material to form insulating clamps. After the transformer body adopts insulating clamps, the insulation distance from the winding 2 and the leads to the clamps can be significantly reduced, or even eliminated. Therefore, the volume of the transformer body can be reduced, thereby reducing the size of the transformer tank, reducing the amount of transformer oil used, and lowering the cost of the transformer.
[0044] In addition, using insulating materials to make clamps can reduce the cost of transformers to some extent, as the cost of insulating materials is lower than that of steel parts.
[0045] The insulating material used for the upper clamp 3 and the lower clamp 4 is at least one of mica board, laminated paperboard and laminated wood board.
[0046] The upper clamp 3 and lower clamp 4 of the transformer body disclosed in this solution are insulated clamps. The effects of high-frequency electromagnetic fields and currents on the upper clamp 3 and lower clamp 4 made of steel will not be generated in the upper clamp 3 and lower clamp 4 made of insulating material. The eddy current loss and stray loss in the upper clamp 3 and lower clamp 4 made of steel are reduced to near zero, which can significantly improve the performance and operating efficiency of the transformer and make the energy saving effect more obvious.
[0047] The transformer body disclosed in this application not only reduces costs but also improves performance and operating efficiency, which helps to enhance the market competitiveness of transformers.
[0048] In this design, the upper clamp 3 and the lower clamp 4 are made of insulating material. The upper clamp 3 and the lower clamp 4 made of insulating material are equivalent to the combination of upper clamp 3 and lower clamp 4 and insulating parts in related technologies, which reduces the number of parts in the transformer body and simplifies the structure of the transformer body.
[0049] After the upper clamp 3 and the lower clamp 4 are made of insulating material, their strength will not be reduced, so as to ensure the clamping effect on the winding 2 and ensure the stability and reliability of the transformer operation.
[0050] like Figure 3As shown, the upper clamping member 3 includes two parallel upper clamping plates 31 and an upper side plate 32 located between the two upper clamping plates 31. Both ends of the upper side plate 32 are connected to the two upper clamping plates 31, and the planes containing the upper clamping plates 31 and the upper side plate 32 are parallel; and / or,
[0051] The lower clamp 4 includes two lower clamping plates arranged in parallel and a lower side plate located between the two lower clamping plates. The two ends of the lower side plate are connected to the two lower clamping plates, and the planes on which the lower clamping plates and the lower side plate are located are parallel.
[0052] The upper clamp 3 and the lower clamp 4 can have the same or different structures.
[0053] like Figure 2 The diagram shows the structure of a single-phase transformer. The length extension direction of the upper clamping plate 31 is consistent with the arrangement direction of the primary winding 2 and the secondary winding 2. At least two upper side plates 32 are provided along the length direction of the upper clamping plate 31. The upper clamping plate 31 and the upper side plates 32 are combined to form a structurally stable upper clamping member 3.
[0054] Optionally, the upper clamping plate 31 and the upper side plate 32 are connected by bolts.
[0055] The transformer body disclosed in this application also includes an insulating strap 5.
[0056] An insulating pull strap 5 is installed on the frame structure composed of the upper clamp 3 and the lower clamp 4. The insulating pull strap 5 provides a clamping force to the upper clamp 3 and the lower clamp 4, which drives the upper clamp 3 and the lower clamp 4 to further compress the winding 2, ensuring that the short-circuit withstand performance of the winding 2 meets the requirements.
[0057] The insulating pull strap 5 can apply an elastic clamping force to the frame, ensuring that the upper clamp 3 and lower clamp 4 are not damaged while applying the clamping force to the frame.
[0058] Optionally, after the insulating strap 5 is wrapped around the outside of the frame, it is fastened by knotting. The clamping force of the insulating strap 5 on the frame can be adjusted.
[0059] Optionally, the insulating pull strip 5 is located at the midpoint of the length direction of the upper clamp 3 and the lower clamp 4, such as... Figure 3 As shown, the insulating strip 5 is located between the primary winding 2 and the secondary winding 2 of the single-phase transformer.
[0060] Along the length of the upper clamp 3 and the lower clamp 4, there are at least two insulating pull strips 5.
[0061] To avoid localized stress concentration and temperature increases when the upper clamp 3 and lower clamp 4 engage with the insulating pull strip 5, the insulating pull strip 5 is required to have a certain width along the length of the upper clamp 3 and lower clamp 4. This width is designed by those skilled in the art according to actual needs and is not specifically limited here.
[0062] To ensure the stability of the fit between the insulating pull strip 5 and the frame, a limiting groove 41 is provided on the side of the lower clamp 4 that fits with the insulating pull strip 5, and the insulating pull strip 5 is located in the limiting groove 41.
[0063] The limiting groove 41 limits the insulating pull strip 5 to prevent the insulating pull strip 5 from changing position due to transformer vibration during transformer operation.
[0064] To further optimize the above technical solution, the transformer body disclosed in this application also includes a U-shaped nut. The U-shaped nut is located in the limiting groove 41, the closed end of the U-shaped nut abuts against the bottom of the limiting groove 41, and the open end of the U-shaped nut faces the same direction as the opening of the limiting groove 41.
[0065] Before the insulating pull strap 5 is fitted with the frame, the U-shaped nut is placed in the limiting groove 41, and then the insulating pull strap 5 is fitted onto the frame. The insulating pull strap 5 fits with the closed end of the U-shaped nut, and the U-shaped nut is fixed in the groove of the lower clamp 4 by the insulating pull strap 5.
[0066] The screw section of the U-shaped nut is connected to the pad 7 of the transformer body. By adjusting the U-shaped screw 6, the U-shaped screw 6 drives the insulating pull strip 5 to move. The U-shaped screw 6 applies tension to the insulating pull strip 5, and the insulating pull strip 5 applies a clamping force to the upper clamp 3, further pressing the winding 2 onto the lower clamp 4.
[0067] Optionally, the upper clamp 3, the lower clamp 4, and the pad 7 are locked together by a tension screw 8.
[0068] The pad 7 is connected to the transformer oil tank to fix the transformer body in the transformer oil tank. The pad 7 of the transformer is a metal plate, optionally a steel plate.
[0069] The transformer body disclosed in this application is applicable to both single-phase and three-phase transformers.
[0070] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed, and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. The scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described application concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
Claims
1. A transformer core, characterized in that It includes an iron core (1), a winding (2), an upper clamp (3) and a lower clamp (4); The winding (2) is wound on the core column of the iron core (1); The upper clamp (3) and the lower clamp (4) are located at the upper and lower ends of the winding (2) respectively, and the upper clamp (3) and the lower clamp (4) are connected to press the winding (2). The upper clamp (3) and the lower clamp (4) are insulating clamps.
2. The transformer core of claim 1, wherein The upper clamp (3) includes two parallel upper clamping plates (31) and an upper side plate (32) located between the two upper clamping plates (31). Both ends of the upper side plate (32) are connected to the two upper clamping plates (31). The planes containing the upper clamping plates (31) and the upper side plate (32) are parallel; and / or, The lower clamp (4) includes two lower clamping plates arranged in parallel and a lower side plate located between the two lower clamping plates. The two ends of the lower side plate are connected to the two lower clamping plates, and the planes where the lower clamping plates and the lower side plate are located are parallel.
3. The transformer core of claim 1, wherein It also includes insulating pull strips (5); The insulating pull strip (5) is sleeved outside the frame formed by the upper clamp (3) and the lower clamp (4), and the insulating pull strip (5) is used to apply a clamping force to the frame.
4. The transformer core of claim 3, wherein The lower clamp (4) is provided with a limiting groove (41) on one side that cooperates with the insulating pull strip (5), and the insulating pull strip (5) is located in the limiting groove (41).
5. The transformer core of claim 4, wherein, It also includes a U-shaped screw (6), which is located in the limiting groove (41). The closed end of the U-shaped screw (6) is engaged with the insulating pull strip (5), and the threaded section of the U-shaped screw (6) is connected to the pad plate (7) of the transformer body.
6. The transformer core of any of claims 1-5, wherein, The upper clamp (3), the lower clamp (4), and the pad (7) of the transformer body are locked together by a tension screw (8).
7. The transformer core of any of claims 1-5, wherein, The upper clamp (3) and the lower clamp (4) are at least one of mica board, laminated paperboard and laminated wood board.
8. A transformer, characterized by It includes a transformer body and a transformer tank, wherein the transformer body is located in the transformer tank; The transformer body is the transformer body according to any one of claims 1-7.
9. The transformer of claim 8, wherein, The pad (7) of the transformer body is a metal plate; The pad (7) is connected to the transformer oil tank.
10. The transformer of claim 8, wherein, The transformer is either a single-phase transformer or a three-phase transformer.