Transformer

Abstract

The utility model provides a transformer. The transformer includes: an iron core; the coil structure is arranged on the periphery of the iron core in a sleeving mode, the coil structure comprises a plurality of winding structures which are sequentially arranged from inside to outside in the radial direction of the coil structure, a first containing area is formed between at least part of every two adjacent winding structures, a first insulation structure is arranged in each first containing area, and the withstand voltage of the first insulation structures is larger than 400 V; each first insulating structure covers at least part of the winding structure corresponding to the first insulating structure. According to the technical scheme, the transformer can solve the problem that the utilization rate of a coil in the height direction is low due to the fact that an insulating end ring is arranged between two sections of coils of an existing transformer.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and more specifically, to a transformer. Background Technology

[0002] In the current field of photovoltaic transformer technology, especially for 35kV high-voltage photovoltaic transformers, the Delta (D-connection) method is widely used both domestically and internationally for electrical connection. This is based on the consideration of the electrical strength and reliability requirements of high-voltage transformers. With the Delta connection, the high-voltage phase voltage remains consistent with the line voltage, providing a foundation for the stable operation of the transformer in photovoltaic power plants. However, this type of high-voltage transformer faces significant challenges in design and manufacturing, particularly in reducing inter-layer voltage to ensure electrical safety and improve production efficiency.

[0003] In existing technologies, to address the interlayer voltage problem, a two-section cylindrical transformer is typically used. This means the high-voltage coil of the transformer is designed as two sections, upper and lower, with DDP (Double-sided Dipping Paper) ordinary adhesive paper used as the interlayer insulation material between each section. While DDP adhesive paper has certain electrical insulation properties, it has limitations in withstanding high voltage. Furthermore, the use of insulating end rings between the two coil sections results in low utilization of the coils in the height direction. Utility Model Content

[0004] The main objective of this invention is to provide a transformer that can solve the problem that the utilization rate of the coil in the height direction is low due to the setting of the insulating end ring between the two sections of the coil in existing transformers.

[0005] To achieve the above objectives, this utility model provides a transformer, comprising: an iron core; a coil structure sleeved on the outer periphery of the iron core, the coil structure comprising a plurality of winding structures arranged sequentially from the inside to the outside along the radial direction of the coil structure, at least partially adjacent two winding structures forming a first accommodating region, each first accommodating region being provided with a first insulating structure, the first insulating structure having a withstand voltage greater than 400V, and each first insulating structure covering at least partially the winding structure corresponding to the first insulating structure.

[0006] Furthermore, the withstand voltage of the first insulation structure is greater than or equal to 800V.

[0007] Furthermore, along the axial direction of the coil structure, each winding structure is a continuous structure without segmentation; and / or, the first insulation structure uses DPE insulating paper.

[0008] Furthermore, a second insulation structure is provided between the iron core and the winding structure adjacent to the iron core.

[0009] Furthermore, the withstand voltage of the second insulation structure is greater than that of the first insulation structure.

[0010] Furthermore, there are multiple first insulating structures in each first accommodating region. Along the radial direction of the coil structure, the number of first insulating structures in the first accommodating region closest to the iron core is N1, the number of first insulating structures in the first accommodating region furthest from the iron core is N2, and the number of first insulating structures in the remaining first accommodating regions is N3, wherein both N1 and N2 are greater than N3.

[0011] Furthermore, a second accommodating area is formed between two adjacent winding structures, and a support curtain is installed in each second accommodating area.

[0012] Furthermore, the support curtain includes an insulating body and a plurality of insulating support bars. The insulating body has a first side and a second side that are arranged opposite to each other. A plurality of insulating support bars are arranged sequentially along a first direction on the first side and / or the second side. An oil channel is formed between two adjacent insulating support bars on the same side of the insulating body.

[0013] Furthermore, the transformer also includes two corner rings, and the coil structure has a first end and a second end that are arranged opposite each other along the axial direction of the coil structure, with the two corner rings respectively disposed at the first end and the second end.

[0014] Furthermore, the support curtain is made of insulating cardboard.

[0015] The present invention employs a core and a coil structure. The coil structure includes multiple winding structures arranged radially from the inside to the outside. At least some adjacent winding structures form a first accommodating region. Each first accommodating region contains a first insulating structure. The first insulating structure has a withstand voltage greater than 400V. Compared with traditional DDP adhesive paper, the first insulating structure has stronger insulation performance. At the same voltage level, the first insulating structure can withstand higher interlayer voltage. This means that at the same voltage level, the first insulating structure can achieve the same insulation effect as the traditional two-section coil without the need for an intermediate insulating partition. This significantly improves the utilization rate of the coil structure. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof.

[0017] In the picture:

[0018] Figure 1 A schematic diagram of the structure of a transformer in the prior art is shown;

[0019] Figure 2 A schematic diagram of the coil structure of a prior art transformer is shown;

[0020] Figure 3 A partial structural schematic diagram of a transformer according to an embodiment of the present invention is shown;

[0021] Figure 4 A partial structural schematic diagram of a transformer according to an embodiment of the present invention is shown;

[0022] Figure 5 A partial structural schematic diagram of a support strip curtain according to an embodiment of the present invention is shown;

[0023] Figure 6 A partial structural schematic diagram of a support curtain according to another embodiment of the present invention is shown.

[0024] The above figures include the following reference numerals:

[0025] 10. Coil structure; 11. Winding structure; 12. First receiving area; 13. First insulation structure; 14. Second receiving area; 20. Supporting strip curtain; 21. Insulation body; 22. Insulation support strip; 30. Corner ring; 40. Coil; 50. DDP adhesive paper; 60. Insulation end ring. Detailed Implementation

[0026] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 The diagram shown is a schematic representation of the structure of a transformer in the prior art. Figure 2 The diagram illustrates the structure of the coil 40 in a prior art transformer. This prior art transformer employs a two-section coil design, with DDP adhesive paper 50 placed between the coils. An insulating end ring 60 is placed between the upper and lower coil sections to ensure electrical isolation and insulation. However, the insulating end ring 60 occupies space in the height direction of the coil, thus reducing the overall height utilization rate of the coil. Furthermore, the winding process is complex and inefficient. After the upper coil section is wound, the entire coil must be removed from the winding machine, rotated 180 degrees, and repositioned before the winding of the lower coil section can begin. This process not only increases labor time but may also lead to inaccurate coil positioning due to frequent disassembly and reassembly, affecting winding quality and consequently the electrical performance and stability of the transformer.

[0028] To solve the above problems, see [reference] Figures 3 to 6As shown, this utility model provides a transformer, which includes: an iron core; a coil structure 10, which is sleeved on the outer periphery of the iron core. The coil structure 10 includes a plurality of winding structures 11 arranged sequentially from the inside to the outside along the radial direction of the coil structure 10. At least a first accommodating region 12 is formed between at least two adjacent winding structures 11. A first insulating structure 13 is provided in each first accommodating region 12. The withstand voltage of the first insulating structure 13 is greater than 400V. Each first insulating structure 13 covers at least a portion of the winding structure 11 corresponding to the first insulating structure 13.

[0029] In this embodiment, a first accommodating region 12 is formed between at least two partially adjacent winding structures 11. A first insulating structure 13 is provided in each first accommodating region 12. The first insulating structure 13 has a withstand voltage greater than 400V. Compared with traditional DDP adhesive paper, the first insulating structure 13 has stronger insulation performance. At the same voltage level, the first insulating structure 13 can withstand higher interlayer voltage. This means that at the same voltage level, the first insulating structure 13 can achieve the same insulation effect as the traditional two-section coil without the need for an intermediate insulating partition to divide the coil. This significantly improves the utilization rate of the coil structure 10. Furthermore, since the insulating end ring 60 between the upper and lower coil sections is eliminated, it is not necessary to rotate the coil structure 10 180 degrees to wind the next section when winding the coil structure 10, reducing the complexity of the process. This not only shortens the time consumption during the winding process but also avoids the problem of inaccurate coil structure positioning due to frequent disassembly and assembly, which affects the winding quality and thus the electrical performance and stability of the transformer.

[0030] In one embodiment of this utility model, the withstand voltage of the first insulating structure 13 is greater than or equal to 800V.

[0031] In this embodiment, the first insulation structure 13 has a high withstand voltage capability. Therefore, fewer first insulation structures 13 can be used to achieve the same insulation effect, reducing the amount of insulation material used and lowering the production cost of the transformer. Furthermore, in the prior art, to meet insulation requirements, the coil is often designed as two segments separated by an insulating end ring 60. However, when the withstand voltage of the first insulation structure 13 in this application is increased to 800V or higher, the coil structure 10 can be simplified to a single segment, eliminating the intermediate insulating end ring 60. This not only reduces material usage but also makes the coil structure more compact in the height direction, improving the space utilization of the coil structure.

[0032] For ease of understanding, assuming an interlayer voltage of 3200V, using traditional DDP adhesive paper 50, with each sheet of DDP adhesive paper having a withstand voltage of 400V, and considering that the existing coil 40 is divided into two segments, the interlayer voltage of each segment is 1600V, requiring 4 sheets of DDP paper per segment. Therefore, the existing transformer requires a total of 8 sheets of DDP adhesive paper. However, in the transformer of this application, since the withstand voltage of the first insulation structure 13 is twice or more than twice that of the DDP adhesive paper, only 4 first insulation structures 13 are required.

[0033] In one embodiment of this utility model, each winding structure 11 is a continuous structure without segmentation along the axial direction of the coil structure 10.

[0034] In this embodiment, the continuous winding structure 11 simplifies the winding process, allowing the winding operation to be completed in one go without rotating the coil structure after winding a section. This significantly saves time, reduces potential errors in production, and improves production efficiency. Simultaneously, the elimination of the insulating end ring 60 reduces material usage and material costs, thereby lowering the transformer's manufacturing cost. Furthermore, the use of a continuous, non-segmented winding structure 11 makes the coil structure 10 more compact, reducing space requirements.

[0035] In one embodiment of this utility model, the first insulating structure 13 is made of DPE insulating paper.

[0036] In this embodiment, DPE insulating paper, also known as Diamond Printed Enhanced insulating paper, is a specially treated insulating paper with higher dielectric properties and voltage resistance. A single sheet of DPE paper can withstand two or more times the voltage of DDP adhesive paper. Under the same working voltage, DPE insulating paper can achieve the same insulation effect with fewer layers.

[0037] It should be noted that DPE insulating paper is existing technology and can be purchased on the market. The specific special processing techniques used will not be elaborated here.

[0038] See also Figures 3 to 6 As shown, in one embodiment of the present invention, a second insulating structure is provided between the iron core and the winding structure 11 adjacent to the iron core.

[0039] In this embodiment, the second insulation structure can form a high-insulation barrier between the iron core and the adjacent winding structure 11, preventing the magnetic field on the iron core from directly passing through the winding, thereby avoiding mutual interference between the electric field and the magnetic field and maintaining the stable electrical performance of the transformer.

[0040] In one embodiment, the second insulation structure is made of insulating paper.

[0041] In one embodiment of this invention, the withstand voltage of the second insulating structure is greater than the withstand voltage of the first insulating structure 13.

[0042] In this embodiment, the second insulation structure is located between the iron core and the winding structure 11 adjacent to the iron core. It is the first electrical isolation barrier inside the transformer. By setting a higher withstand voltage, the second insulation structure can still provide sufficient insulation protection even when the first insulation structure 13 experiences a local fault or performance degradation, thereby significantly improving the electrical safety of the equipment.

[0043] In one embodiment of this utility model, the number of first insulating structures 13 in each first accommodating region 12 is multiple. Along the radial direction of the coil structure 10, the number of first insulating structures 13 in the first accommodating region 12 closest to the iron core is N1, the number of first insulating structures 13 in the first accommodating region 12 furthest from the iron core is N2, and the number of first insulating structures 13 in the remaining first accommodating regions 12 is N3, wherein N1 and N2 are both greater than N3.

[0044] In this embodiment, the iron core is the concentrated area of ​​the magnetic field in the transformer. The location of the winding structure 11 closest to the iron core is subject to the strongest electromagnetic interference. Therefore, the first accommodating area 12 closest to the iron core needs more first insulation structures 13 to provide additional electrical isolation to ensure the insulation safety between the high-voltage winding structure 11 and the iron core. The first accommodating area 12 furthest from the iron core also needs additional insulation. Although the electromagnetic interference is smaller, increasing the number of first insulation structures 13 can provide additional safety protection in order to cope with possible uneven voltage distribution or other electrical risks.

[0045] In addition, the innermost and outermost winding structures 11 are not only affected by electrical stress, but may also be affected by thermal stress. The innermost layer of the winding structure 11, which is in contact with the iron core, will face higher thermal stress due to the temperature rise of the iron core, while the outermost layer may suffer thermal stress due to heat dissipation problems or changes in the external ambient temperature. Through the above-mentioned arrangement, the thermal stability of these areas can be improved.

[0046] See also Figures 3 to 6 As shown, in one embodiment of the present invention, a second receiving area 14 is formed between two adjacent winding structures 11, and a support curtain 20 is provided in each second receiving area 14.

[0047] In this embodiment, the support curtain 20 provides physical support between the winding structures 11, enhancing the mechanical stability of the winding structures 11. During the operation of the transformer, the electromagnetic force generated by the current in the winding structures 11 may cause vibration or deformation. The support curtain 20 can effectively reduce this vibration and prevent mutual collision between the winding structures 11, thereby reducing mechanical stress and extending the service life of the transformer.

[0048] See also Figures 3 to 6 As shown, in one embodiment of the present invention, the support curtain 20 includes an insulating body 21 and a plurality of insulating support strips 22. The insulating body 21 has a first side and a second side that are arranged opposite to each other. A plurality of insulating support strips 22 are arranged sequentially along a first direction on the first side and / or the second side. An oil channel is formed between two adjacent insulating support strips 22 located on the same side of the insulating body 21.

[0049] In this embodiment, the insulating support strips 22 can effectively increase the insulation distance between the winding structures 11, thereby improving electrical isolation performance and helping to prevent electrical faults such as short circuits. The oil channels formed between adjacent insulating support strips 22 provide a flow channel for the cooling medium (such as transformer oil), which helps to rapidly transfer and dissipate heat inside the transformer, thereby reducing the temperature of the winding structure 11 and improving the thermal stability and operating efficiency of the transformer.

[0050] like Figure 5 As shown, in one embodiment of the present invention, both ends of the insulating support strip 22 protrude from the insulating body 21. The protruding part of the insulating support strip 22 can increase the insulation distance between the winding structure 11 and the transformer shell or other electrical components. Under high voltage environment, it can effectively prevent electrical breakdown and improve the electrical safety and reliability of the equipment.

[0051] like Figure 6 As shown, in one embodiment of the present invention, the two ends of the insulating support strip 22 are flush with the two ends of the insulating support strip 22, which can reduce the use of additional materials, avoid unnecessary space occupation inside the equipment, thereby reducing costs and improving structural compactness.

[0052] See also Figures 3 to 6 As shown, in one embodiment of the present invention, the transformer further includes two corner rings 30, and the coil structure 10 has a first end and a second end arranged opposite to each other along the axial direction of the coil structure 10, with the two corner rings 30 respectively disposed at the first end and the second end.

[0053] In this embodiment, the two corner rings 30 tightly wrap around the first and second ends of the coil structure 10 to position and fix the coil structure 10 in the axial direction. At the same time, they can also limit the coil structure 10 in the radial direction, restricting the expansion and deformation of the coil structure 10 in the radial direction.

[0054] It should be noted that the corner ring 30 in this application is prior art, and its specific structure will not be described in detail here.

[0055] In one embodiment, both corner rings 30 are made of insulating material, which not only secures the coil structure 10 but also provides additional insulation between the coil structure 10 and the iron core, enhancing the electrical performance of the transformer.

[0056] In one embodiment of this utility model, the support curtain 20 is made of insulating cardboard.

[0057] In this embodiment, the support curtain 20 is made of insulating paperboard. Insulating paperboard has good dielectric properties and can effectively isolate the current between the winding structures 11, ensuring the safety and stability of the transformer during operation. Furthermore, insulating paperboard is usually made of natural or synthetic fibers, which has good environmental friendliness. After the transformer's life cycle ends, the paperboard material is relatively easy to recycle and reuse, reducing the impact on the environment.

[0058] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: The device is provided with an iron core and a coil structure. The coil structure includes multiple winding structures arranged sequentially from the inside to the outside along the radial direction of the coil structure. At least some adjacent winding structures form a first accommodating area. Each first accommodating area is provided with a first insulating structure. The withstand voltage of the first insulating structure is greater than 400V. Compared with traditional DDP adhesive paper, the insulation performance of the first insulating structure is stronger. Under the same voltage level, the first insulating structure can withstand a higher interlayer voltage. This means that under the same voltage level, using the first insulating structure can achieve the same insulation effect as the traditional two-section coil without the need for an intermediate insulating partition for segmentation, thereby significantly improving the high utilization rate of the coil structure.

[0059] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transformer, characterized in that, include: Iron core; A coil structure (10) is sleeved on the outer periphery of the iron core. The coil structure (10) includes a plurality of winding structures (11) arranged in sequence from the inside to the outside along the radial direction of the coil structure (10). At least two adjacent winding structures (11) form a first accommodating region (12). Each first accommodating region (12) is provided with a first insulating structure (13). The withstand voltage of the first insulating structure (13) is greater than 400V. Each first insulating structure (13) covers at least a portion of the winding structure (11) corresponding to the first insulating structure (13).

2. The transformer according to claim 1, characterized in that, The withstand voltage of the first insulation structure (13) is greater than or equal to 800V.

3. The transformer according to claim 1, characterized in that, Along the axial direction of the coil structure (10), each of the winding structures (11) is a continuous structure without segments; and / or, the first insulation structure (13) is made of DPE insulation paper.

4. The transformer according to any one of claims 1 to 3, characterized in that, A second insulation structure is provided between the iron core and the winding structure (11) adjacent to the iron core.

5. The transformer according to claim 4, characterized in that, The withstand voltage of the second insulation structure is greater than that of the first insulation structure (13).

6. The transformer according to any one of claims 1 to 3, characterized in that, The number of the first insulating structure (13) in each of the first accommodating regions (12) is multiple. Along the radial direction of the coil structure (10), the number of the first insulating structure (13) in the first accommodating region (12) closest to the iron core is N1, the number of the first insulating structure (13) in the first accommodating region (12) furthest from the iron core is N2, and the number of the first insulating structure (13) in the remaining first accommodating regions (12) is N3, wherein N1 and N2 are both greater than N3.

7. The transformer according to any one of claims 1 to 3, characterized in that, A second receiving area (14) is formed between two partially adjacent winding structures (11), and a support curtain (20) is provided in each of the second receiving areas (14).

8. The transformer according to claim 7, characterized in that, The support curtain (20) includes an insulating body (21) and a plurality of insulating support strips (22). The insulating body (21) has a first side and a second side arranged opposite to each other. A plurality of insulating support strips (22) are arranged sequentially along a first direction on the first side and / or the second side. An oil channel is formed between two adjacent insulating support strips (22) on the same side of the insulating body (21).

9. The transformer according to any one of claims 1 to 3, characterized in that, The transformer also includes two corner rings (30), and the coil structure (10) has a first end and a second end that are arranged opposite to each other along the axial direction of the coil structure (10), with the two corner rings (30) respectively disposed at the first end and the second end.

10. The transformer according to claim 8, characterized in that, The support curtain (20) is made of insulating cardboard.

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