transformer

Abstract

The application relates to a transformer, which comprises an oil tank containing transformer oil, a coil soaked in the transformer oil and having a winding oil path, an inner paper tube arranged at the inner diameter side of the coil and cooperating with the inner diameter side of the coil to define an inner ring oil path, an outer paper tube arranged at the outer diameter side of the coil and cooperating with the outer diameter side of the coil to define an outer ring oil path, an inner oil blocking piece connected to the inner paper tube and capable of moving along the radial direction of the inner paper tube to abut or separate from the coil, and an outer oil blocking piece connected to the outer paper tube and capable of moving along the radial direction of the outer paper tube to abut or separate from the coil. When the inner oil blocking piece or the outer oil blocking piece abuts the coil, the inner ring oil path or the outer ring oil path is blocked, respectively. When the inner oil blocking piece or the outer oil blocking piece separates from the coil, the inner ring oil path or the outer ring oil path is communicated, respectively. The transformer can effectively control the hot spot temperature rise of the coil.

Description

Technical Field

[0001] This application relates to the field of transformer manufacturing technology, and in particular to a transformer. Background Technology

[0002] For vegetable oil transformers, the viscosity of vegetable oil is higher than that of mineral oil, thus placing higher demands on the heat dissipation structure. Therefore, the winding oil circuit needs to be optimized to maximize the cooling effect of the oil flow on the windings. Transformer oil baffles can effectively change the direction of oil flow inside the windings. By rationally arranging these baffles, the convective heat transfer area between the oil flow and the windings can be increased, thereby improving heat dissipation performance.

[0003] However, the current arrangement of oil baffles is mainly based on experience, while the distribution of hot spot temperature rise in the winding has a certain degree of randomness due to manufacturing errors. Conventional arrangements cannot specifically reduce the hot spot temperature rise. In addition, due to the very complex internal structure of the winding, it is difficult to create a three-dimensional mesh, and it is also difficult to accurately obtain the location of hot spot temperature through simulation, making targeted design improvements difficult to carry out. Summary of the Invention

[0004] Therefore, it is necessary to provide a transformer whose oil baffle arrangement can specifically reduce hot spot temperature rise, addressing the problem that conventional oil baffle arrangements in transformers cannot effectively reduce hot spot temperature rise.

[0005] According to one aspect of this application, a transformer is provided, comprising:

[0006] The oil tank contains transformer oil;

[0007] A coil is immersed in the transformer oil, and the coil has winding oil passages.

[0008] An inner paper tube is located on the inner diameter side of the coil and, together with the inner diameter side of the coil, defines an inner ring oil passage.

[0009] An outer paper tube is disposed on the outer diameter side of the coil and, in conjunction with the outer diameter side of the coil, defines an outer annular oil passage; and

[0010] An inner oil baffle is fitted to the inner paper tube and can move radially relative to the inner paper tube to abut or disengage from the coil.

[0011] An outer oil baffle is fitted to the outer paper tube and can move radially relative to the outer paper tube to abut against or disengage from the coil.

[0012] Specifically, when the inner oil baffle or the outer oil baffle abuts against the coil, it can respectively block the inner ring oil circuit or the outer ring oil circuit; when the inner oil baffle or the outer oil baffle disengages from the coil, it can respectively connect the inner ring oil circuit or the outer ring oil circuit.

[0013] In one embodiment, the outer oil baffle is controllably capable of extending and retracting relative to the outer paper tube along the radial direction of the outer paper tube to block or connect the outer annular oil passage, and / or

[0014] The inner oil baffle can be controlled to extend and retract relative to the inner paper tube along the radial direction of the inner paper tube, so as to block or connect the inner ring oil circuit.

[0015] In one embodiment, the inner oil baffle includes a plurality of sub-inner oil baffles spaced apart on the inner paper tube along the axial direction of the inner paper tube. When all the sub-inner oil baffles abut against the coil, they can divide the inner ring oil circuit into a plurality of sub-inner ring oil circuits. When at least one of the sub-inner oil baffles is detached from the coil, it can connect the two adjacent sub-inner ring oil circuits.

[0016] The outer oil baffle includes a plurality of sub-outer oil baffles spaced apart on the outer paper tube along the axial direction of the paper tube. When all the sub-outer oil baffles abut against the coil, they can divide the outer ring oil circuit into a plurality of sub-outer ring oil circuits. When at least one of the sub-outer oil baffles is detached from the coil, it can connect the two adjacent sub-outer ring oil circuits.

[0017] In one embodiment, all of the inner oil baffles and all of the outer oil baffles are alternately arranged on the inner paper tube and the outer paper tube.

[0018] In one embodiment, all of the inner oil baffles are equally spaced along the axial direction of the inner paper tube; and / or

[0019] All of the aforementioned sub-outer oil baffles are equally spaced along the axial direction of the outer paper tube on the outer paper tube.

[0020] In one embodiment, each of the inner oil-blocking components includes a plurality of inner oil-blocking parts, each of the inner oil-blocking parts being movable relative to the inner paper tube in the radial direction of the inner paper tube to abut or disengage from the coil.

[0021] When all the inner oil baffles abut against the coil, all the sub-inner ring oil circuits can be blocked; when at least one of the inner oil baffles disengages from the coil, the two adjacent sub-inner ring oil circuits can be connected.

[0022] Each of the aforementioned sub-outer oil baffles includes multiple outer oil baffles, and each of the aforementioned outer oil baffles can move relative to the outer paper tube along the radial direction of the outer paper tube to abut against or disengage from the coil;

[0023] When all of the outer oil baffles abut against the coil, all of the sub-outer ring oil circuits can be blocked; when at least one of the oil baffles disengages from the coil, the two adjacent sub-outer ring oil circuits can be connected.

[0024] In one embodiment, an oil sealing element is also included, which seals the inner oil baffle and the outer oil baffle on the side away from the coil.

[0025] In one embodiment, each of the inner and outer oil baffles further includes a plurality of operating parts, and each of the inner and outer oil baffles is provided with one of the operating parts.

[0026] Each of the aforementioned operating units can be controlled to move the currently located inner oil-blocking unit or outer oil-blocking unit relative to its respective inner paper tube or outer paper tube.

[0027] In one embodiment, the coil includes a plurality of spaced windings, with multiple winding oil passages defined between all the windings.

[0028] In one embodiment, both the inner and outer oil baffles are made of corrugated cardboard.

[0029] In the aforementioned transformer, when the hot spot is located on the inner diameter side of the coil, the inner oil-blocking component disengages from the coil to open the inner ring oil circuit, while the outer oil-blocking component abuts against the coil to block the outer ring oil circuit. This allows more transformer oil to flow through the inner ring oil circuit, effectively controlling the temperature rise of the hot spot on the inner diameter side of the coil. When the hot spot is located on the outer diameter side of the coil, the inner oil-blocking component abuts against the coil to block the inner ring oil circuit, while the outer oil-blocking component disengages from the coil to open the outer ring oil circuit. This allows more transformer oil to flow through the outer ring oil circuit, effectively controlling the temperature rise of the hot spot on the outer diameter side of the coil. When the hot spot is located in the middle of the coil, the inner oil-blocking component abuts against the coil to block the inner ring oil circuit, while the outer oil-blocking component abuts against the coil to block the outer ring oil circuit. This allows more transformer oil to flow through the winding oil circuit, effectively controlling the temperature rise of the hot spot in the middle of the coil. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the winding and oil baffle arrangement of a transformer according to one embodiment of this application;

[0031] Figure 2 for Figure 1 A schematic diagram of the structure of the inner oil baffle in the shown oil baffle;

[0032] Figure 3 for Figure 2 The diagram shows the structure of the inner oil baffle in another state.

[0033] Figure 4 for Figure 1 The diagram shows the structure of the outer oil baffle in the oil baffle assembly.

[0034] Figure 5 for Figure 4 The diagram shows a structural schematic of the external oil baffle in another state.

[0035] Figure 6 for Figure 1 The diagram shows a structural schematic of the inner loop oil circuit being blocked in the transformer.

[0036] Figure 7 for Figure 1 The diagram shows a structural schematic of the outer ring oil circuit being blocked in a transformer.

[0037] Figure 8 for Figure 1 The diagram shows the structure of the transformer in which the inner and outer oil circuits are connected.

[0038] 100. Transformer; 10. Coil; 11. Winding; 21. Inner paper tube; 22. Outer paper tube; 31. Inner oil baffle; 311. Sub-inner oil baffle; 3111. Inner oil baffle section; 3112. Operating section; 32. Outer oil baffle; 321. Sub-outer oil baffle; 3211. Outer oil baffle section; 40. Winding oil passage; 51. Inner ring oil passage; 511. Sub-inner ring oil passage; 52. Outer ring oil passage; 521. Sub-outer ring oil passage; 60. Oil sealing component. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] The transformer of this application will now be described in conjunction with the accompanying drawings. For ease of description, only the structures relevant to this application are shown in the drawings.

[0046] Please see Figure 1 The transformer 100 disclosed in at least one embodiment of this application includes an oil tank (not shown), a coil 10, an inner paper tube 21, an outer paper tube 22, an inner oil baffle 31, and an outer oil baffle 32.

[0047] The oil tank contains transformer oil. Transformer oil improves the insulation strength of coil 10 and prevents moisture corrosion. Furthermore, transformer oil has a high specific heat and is commonly used as a coolant. The heat generated during transformer 100 operation causes the oil near the core and winding 11 to expand and rise. Through vertical convection of the oil, the heat is dissipated through the radiator, ensuring the normal operation of transformer 100.

[0048] In this embodiment, the transformer oil used is vegetable insulating oil. As a novel environmentally friendly liquid insulating material, vegetable insulating oil, compared to traditional mineral oil, exhibits superior fire safety, particularly in terms of explosion-proof performance. Due to its ignition point exceeding 300℃, it is not easily combustible and belongs to the K-class flame-retardant insulating material category. In terms of environmental protection, its biodegradability is one of its main advantages; vegetable insulating oil achieves a biodegradability rate of up to 97% within 28 days, ensuring no environmental pollution to the atmosphere, soil, or water sources in the event of an accident. Furthermore, vegetable oil enhances the heat resistance of the winding insulation system and delays the aging of the insulating paper.

[0049] Furthermore, the coil 10 is immersed in transformer oil, and the coil 10 has winding oil passages 40. Specifically, in the embodiments of this application, the coil 10 includes a plurality of spaced-apart windings 11, and the spaced-apart windings 11 define a plurality of winding oil passages 40. Specifically, the winding oil passages 40 can be formed at the intervals between two windings 11, or at the intervals between three windings 11, or at the intervals between multiple windings 11. It should be noted that the plurality of winding oil passages 40 formed between the windings 11 are identical to each other.

[0050] Furthermore, the inner paper tube 21 is located on the inner diameter side of the coil 10, and the outer paper tube 22 is located on the outer diameter side of the coil 10. The inner paper tube 21 and the outer paper tube 22 respectively cooperate with the inner and outer diameter sides of the coil 10 to define and form the inner ring oil passage 51 and the outer ring oil passage 52.

[0051] Specifically, the inner paper tube 21 is spaced apart from the inner diameter side of the coil 10, and the space between the inner paper tube 21 and the inner diameter side of the coil 10 defines an inner ring oil passage 51. The outer paper tube 22 is spaced apart from the outer diameter side of the coil 10, and the space between the outer paper tube 22 and the outer diameter side of the coil 10 defines an outer ring oil passage 52. It should be noted that both the inner ring oil passage 51 and the outer ring oil passage 52 are connected to the winding oil passage 40.

[0052] Please refer to it again. Figure 1 Furthermore, the inner oil baffle 31 is fitted onto the inner paper tube 21 and can move radially relative to the inner paper tube 21 to abut or disengage from the coil 10. The outer oil baffle 32 is fitted onto the outer paper tube 22 and can move radially relative to the outer paper tube 22 to abut or disengage from the coil 10.

[0053] Furthermore, when the inner oil baffle 31 or the outer oil baffle 32 abuts against the coil 10, they can respectively block the inner ring oil circuit 51 or the outer ring oil circuit 52; when the inner oil baffle 31 or the outer oil baffle 32 disengages from the coil 10, they can respectively connect the inner ring oil circuit 51 or the outer ring oil circuit 52.

[0054] In practical applications, when the hot spot is located on the inner diameter side of the coil, the inner oil baffle 31 is disengaged from the coil 10 to connect the inner ring oil passage 51, while the outer oil baffle 32 abuts against the coil 10 to block the outer ring oil passage 52. This allows more transformer oil to flow through the inner ring oil passage 51, effectively controlling the temperature rise of the hot spot on the inner diameter side of the coil 10. When the hot spot is located on the outer diameter side of the coil, the inner oil baffle 31 abuts against the coil 10 to block the inner ring oil passage 51, while the outer oil baffle 32 is disengaged from the coil 10 to connect the outer ring oil passage 52. This allows more transformer oil to flow through the outer ring oil passage 51, effectively controlling the temperature rise of the hot spot on the outer diameter side of the coil 10. When the hot spot is located in the middle of the coil, the inner oil baffle 31 abuts against the coil 10 to block the inner ring oil passage 51, while the outer oil baffle 32 abuts against the coil 10 to block the outer ring oil passage 52. This allows more transformer oil to flow through the winding oil passage 40, effectively controlling the temperature rise of the hot spot in the middle of the coil 10.

[0055] In some embodiments, the inner oil baffle 31 can be controlled to extend and retract relative to the inner paper tube 21 in the radial direction of the inner paper tube 21 to block or connect the inner annular oil passage 51. In other embodiments, the outer oil baffle 32 can be controlled to extend and retract relative to the outer paper tube 22 in the radial direction of the outer paper tube 22 to block or connect the outer annular oil passage 52. In other embodiments, the inner oil baffle 31 can be controlled to extend and retract relative to the inner paper tube 21 in the radial direction of the inner paper tube 21 to block or connect the inner annular oil passage 51, while the outer oil baffle 32 can be controlled to extend and retract relative to the outer paper tube 22 in the radial direction of the outer paper tube 22 to block or connect the outer annular oil passage 52.

[0056] In some embodiments, both the inner oil baffle 31 and the outer oil baffle 32 are made of corrugated cardboard.

[0057] Please refer to it again. Figure 1 Furthermore, the inner oil baffle 31 includes a plurality of sub-inner oil baffles 311 spaced apart along the axial direction of the inner paper tube 21 on the inner paper tube 21. When all the sub-inner oil baffles 311 abut against the inner diameter side of the coil 10, they can divide the inner ring oil passage 51 into a plurality of sub-inner ring oil passages 511. When at least one sub-inner oil baffle 311 is removed from the inner diameter side of the coil 10, it can connect the two adjacent sub-inner ring oil passages 511.

[0058] Specifically, in this embodiment, all the sub-inner oil baffles 311 are annularly connected to the inner paper tube 21 and spaced apart from adjacent sub-inner oil baffles 311. Therefore, when all the sub-inner oil baffles 311 abut against the inner diameter side of the coil 10, the inner ring oil passage 51 can be divided into multiple sub-inner ring oil passages 511. That is, the inner ring oil passage 51 is constructed to be formed by multiple sub-inner ring oil passages 511 connected along the axial direction of the inner paper tube 21. Further, when at least one sub-inner oil baffle 311 is disengaged from the inner diameter side of the coil 10, it can connect the two adjacent sub-inner ring oil passages 511. All the sub-inner oil baffles 311 can be connected to the inner diameter side of the inner paper tube 21 or to the outer diameter side of the inner paper tube 21, as long as each sub-inner oil baffle 311 can move relative to the inner paper tube 21 and abut against the coil 10.

[0059] Please refer to it again. Figure 6-8 In practical applications, if the hot spot is located on the outer diameter side of coil 10 or in the middle of coil 10, all the inner oil baffles 311 can be brought into contact with the inner diameter side of coil 10 to block the inner ring oil passage 51, allowing more transformer oil to flow through the outer ring oil passage 52 or the winding oil passage 40, thereby reducing the temperature rise of the hot spot on the outer diameter side of coil 10 or in the middle of coil 10. If the hot spot is located on the inner diameter side of coil 10, one or more inner oil baffles 311 near the hot spot can be disengaged from the inner diameter side of coil 10 to connect the inner ring oil passage 511 near the hot spot, while blocking the outer ring oil passage 52, thus allowing more transformer oil to flow through the hot spot. In this way, the temperature rise of the hot spot can be reduced more effectively.

[0060] Please refer to it again. Figure 1 The outer oil baffle 32 includes a plurality of sub-outer oil baffles 321 spaced apart along the axial direction of the outer paper tube 22. When all the sub-outer oil baffles 321 abut against the outer diameter side of the coil 10, they can divide the outer ring oil passage 52 into a plurality of sub-outer ring oil passages 521. When at least one sub-outer oil baffle 321 is removed from the outer diameter side of the coil 10, it can connect the two adjacent sub-outer ring oil passages 521.

[0061] Specifically, in this embodiment, all the sub-outer oil baffles 321 are annularly connected to the outer paper tube 22 and spaced apart from adjacent sub-outer oil baffles 321. Therefore, when all the sub-outer oil baffles 321 abut against the outer diameter side of the coil 10, the outer ring oil passage 52 can be divided into multiple sub-outer ring oil passages 521. That is, the outer ring oil passage 52 is constructed by connecting multiple sub-outer ring oil passages 521 along the axial direction of the outer paper tube 22. Further, when at least one sub-outer oil baffle 321 is disengaged from the outer diameter side of the coil 10, it can connect the two adjacent sub-outer ring oil passages 521. All the sub-outer oil baffles 321 can be connected to the inner diameter side of the outer paper tube 22 or to the outer diameter side of the outer paper tube 22, as long as each sub-outer oil baffle 321 can move relative to the outer paper tube 22 and abut against the coil 10.

[0062] Please refer to it again. Figure 6-8 In practical applications, if the hot spot is located on the inner diameter side of coil 10 or in the middle of coil 10, all the outer oil baffles 321 can be made to abut against the outer diameter side of coil 10 to block the outer ring oil passage 52, so that more transformer oil flows through the inner ring oil passage 51 or the winding oil passage 40, thereby reducing the temperature rise of the hot spot on the inner diameter side of coil 10 or in the middle of coil 10.

[0063] If the hot spot is located on the outer diameter side of coil 10, one or more sub-outer oil baffles 321 near the hot spot can be disengaged from the outer diameter side of coil 10 to connect the sub-outer ring oil passage 521 near the hot spot, while blocking the inner ring oil passage 51, thereby allowing more transformer oil to flow through the hot spot. In this way, the temperature rise of the hot spot can be reduced more effectively.

[0064] In some embodiments, all the inner oil baffles 311 and all the outer oil baffles 321 are alternately arranged on the inner paper tube 21 and the outer paper tube 22. In this way, the transformer oil can flow through each segment of the coil 10, thereby transferring the heat inside the coil 10 and reducing the temperature rise of the coil 10.

[0065] In some embodiments, all the inner oil baffles 311 can be equally spaced on the inner paper tube 21 along the axial direction of the inner paper tube 21, and all the outer oil baffles 321 can be equally spaced on the outer paper tube 22 along the axial direction of the outer paper tube 22. In this way, the temperature rise of hot spots occurring on the inner and outer diameter sides of the coil 10 can be precisely reduced.

[0066] Please see Figure 2-3 Furthermore, each sub-inner oil baffle 311 includes a plurality of inner oil baffle portions 3111, each of which can move relative to the inner paper tube 21 in the radial direction of the inner paper tube 21 to abut or disengage from the coil 10. When all the inner oil baffle portions 3111 abut the coil 10, all sub-inner ring oil passages 511 can be blocked; when at least one inner oil baffle portion 3111 disengages from the coil 10, it can connect the two adjacent sub-inner ring oil passages 511.

[0067] Please see Figure 4-5 Each sub-outer oil baffle 321 includes multiple outer oil baffle portions 3211, each of which can move relative to the outer paper tube 22 in the radial direction of the outer paper tube 22 to abut or disengage from the coil 10. When all the outer oil baffle portions 3211 abut against the coil 10, all sub-outer ring oil passages 521 can be blocked; when at least one oil baffle portion disengages from the coil 10, two adjacent sub-outer ring oil passages 521 can be connected.

[0068] Please refer to it again. Figure 6-8 and combined Figure 2-5 In practical applications, if the hot spot is located on the inner diameter side of coil 10, all outer oil baffles 3211 can be brought into contact with the outer diameter side of coil 10 to block all sub-outer annular oil passages 521, and one or more inner oil baffles 3111 near the hot spot can be disengaged from the inner diameter side of coil 10 to connect the sub-inner annular oil passages 511 near the hot spot, thereby reducing the temperature rise of the hot spot on the inner diameter side of coil 10. This approach can more effectively address the hot spot temperature rise.

[0069] If the hot spot is located on the outer diameter side of coil 10, all inner oil baffles 3111 can be brought into contact with the outer diameter side of coil 10 to block all sub-inner ring oil passages 511, and one or more outer oil baffles 3211 near the hot spot can be disengaged from the outer diameter side of coil 10 to connect the sub-outer ring oil passages 521 near the hot spot, thereby reducing the hot spot temperature rise on the inner diameter side of coil 10. In this way, the hot spot temperature rise can be addressed more effectively.

[0070] Furthermore, the transformer 100 also includes an oil sealing element 60, which seals the inner oil retainer 3111 and the outer oil retainer 3211 on the side away from the coil 10. This prevents transformer oil from leaking through.

[0071] Furthermore, each inner oil baffle 311 and each outer oil baffle 321 also includes multiple operating parts 3112, with one operating part 3112 provided on each inner oil baffle 3111 and each outer oil baffle 3211. Each operating part 3112 can be controlled to move the currently located inner oil baffle 3111 and outer oil baffle 3211 relative to their respective inner paper tube 21 or outer paper tube 22. This facilitates the extension or retraction of the inner and outer oil baffles.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A transformer, characterized in that, include: The oil tank contains transformer oil; A coil is immersed in the transformer oil, and the coil has winding oil passages. An inner paper tube is located on the inner diameter side of the coil and, together with the inner diameter side of the coil, defines an inner ring oil passage. An outer paper tube is disposed on the outer diameter side of the coil and, in conjunction with the outer diameter side of the coil, defines an outer annular oil passage; and An inner oil baffle is fitted to the inner paper tube and can move radially relative to the inner paper tube to abut or disengage from the coil. An outer oil baffle is fitted to the outer paper tube and is capable of moving radially relative to the outer paper tube to abut against or disengage from the coil. Specifically, when the inner oil baffle abuts against the coil, it can block the inner ring oil circuit; when the outer oil baffle abuts against the coil, it can block the outer ring oil circuit. When the inner oil baffle detaches from the coil, it can connect the inner ring oil circuit; when the outer oil baffle detaches from the coil, it can connect the outer ring oil circuit.

2. The transformer according to claim 1, characterized in that, The outer oil baffle can be controlled to extend and retract relative to the outer paper tube along the radial direction of the outer paper tube, so as to block or connect the outer annular oil passage, and / or The inner oil baffle can be controlled to extend and retract relative to the inner paper tube along the radial direction of the inner paper tube, so as to block or connect the inner ring oil circuit.

3. The transformer according to claim 1, characterized in that, The inner oil baffle includes a plurality of sub-inner oil baffles spaced apart on the inner paper tube along the axial direction of the inner paper tube. When all the sub-inner oil baffles abut against the coil, they can divide the inner ring oil circuit into a plurality of sub-inner ring oil circuits. When at least one of the sub-inner oil baffles is detached from the coil, it can connect the two adjacent sub-inner ring oil circuits. The outer oil baffle includes a plurality of sub-outer oil baffles spaced apart on the outer paper tube along the axial direction of the paper tube. When all the sub-outer oil baffles abut against the coil, they can divide the outer ring oil circuit into a plurality of sub-outer ring oil circuits. When at least one of the sub-outer oil baffles is detached from the coil, it can connect the two adjacent sub-outer ring oil circuits.

4. The transformer according to claim 3, characterized in that, All of the inner oil baffles and all of the outer oil baffles are alternately arranged on the inner paper tube and the outer paper tube.

5. The transformer according to claim 3, characterized in that, All of the aforementioned inner oil baffles are equally spaced along the axial direction of the inner paper cylinder; and / or All of the aforementioned sub-outer oil baffles are equally spaced along the axial direction of the outer paper tube on the outer paper tube.

6. The transformer according to claim 3, characterized in that, Each of the sub-inner oil-blocking components includes multiple inner oil-blocking parts, and each inner oil-blocking part can move relative to the inner paper tube along the radial direction of the inner paper tube to abut against or disengage from the coil. When all the inner oil baffles abut against the coil, all the sub-inner ring oil circuits can be blocked; when at least one of the inner oil baffles disengages from the coil, the two adjacent sub-inner ring oil circuits can be connected. Each of the aforementioned sub-outer oil baffles includes multiple outer oil baffles, and each of the aforementioned outer oil baffles can move relative to the outer paper tube along the radial direction of the outer paper tube to abut against or disengage from the coil; When all of the outer oil baffles abut against the coil, all of the sub-outer ring oil circuits can be blocked; when at least one of the oil baffles disengages from the coil, the two adjacent sub-outer ring oil circuits can be connected.

7. The transformer according to claim 6, characterized in that, It also includes an oil sealing element, which seals the inner oil baffle and the outer oil baffle on the side away from the coil.

8. The transformer according to claim 6, characterized in that, Each of the sub-inner oil baffles and each of the sub-outer oil baffles further includes multiple operating parts, and each of the inner oil baffles and each of the outer oil baffles is provided with one operating part; Each of the aforementioned operating units can be controlled to move the currently located inner oil-blocking unit or outer oil-blocking unit relative to its respective inner paper tube or outer paper tube.

9. The transformer according to claim 1, characterized in that, The coil includes multiple windings spaced apart, and multiple winding oil passages are defined between all the windings.

10. The transformer according to claim 1, characterized in that, Both the inner and outer oil baffles are made of corrugated cardboard.

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