Oil blocking device and transformer

Abstract

The utility model belongs to the technical field of transformers, and discloses an oil blocking device and a transformer. The oil baffle device is arranged in the transformer and comprises a support and an oil baffle plate, the support is located at the end, close to the oil inlet of the box body, of the winding and connected with the iron core assembly, the oil baffle plate is connected with the support, the support provides a stable supporting structure for the oil baffle plate, and the problem that the oil baffle plate shakes under the impact effect of oil flow is solved; the stability of the oil baffle plate is ensured; the oil baffle plate blocks the gap between at least part of the winding and the box body, the oil baffle plate can force more cooling oil to enter the winding, the heat convection effect in the winding is improved, the local overheating phenomenon of the winding is effectively reduced, and the safety and stability of the transformer are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an oil retaining device and a transformer. Background Art

[0002] With the development of power grids, transformers are developing in the direction of high voltage and large capacity. At present, forced oil circulation cooling is mostly used to solve the temperature rise problem of large capacity and high voltage transformers. One is a strong oil guide structure, that is, the oil in the cooler is directly introduced into the winding through the oil pump, and sealing measures are adopted in the winding. The oil flow in the cooler basically enters the winding. This cooling method is easy to produce oil flow electrification due to the high flow rate of cold oil in the winding, so the application scenario of this cooling method is limited; the other is a strong oil non-guided structure, that is, the oil pump is connected to the transformer box, part of the oil flow in the cooler enters the winding, and part flows back to the cooler through the gap between the winding and the box. Since the oil flow resistance inside the winding is greater than the oil flow resistance between the winding and the box, under the action of the oil pump, most of the cold oil flows back to the cooler through the gap between the winding and the box.

[0003] In order to improve the internal heat convection of the winding, the prior art adopts an oil baffle plate between the winding and the box, so that the oil flowing out of the oil pump can enter the winding more through the oil baffle plate. However, the oil baffle plate inside the existing transformer lacks stable structural support. The oil baffle plate is prone to shaking under the impact of oil flow, which affects the oil blocking effect and makes the transformer prone to excessive internal average temperature and local overheating of the winding, which greatly affects the life of the transformer and the safety and stability of the power system operation.

[0004] Therefore, there is an urgent need for an oil retaining device and a transformer to solve the problems in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide an oil baffle device, which ensures the stability of the oil baffle plate and can force more cooling oil into the winding, thereby improving the heat convection effect inside the winding, effectively reducing local overheating of the winding, and improving the safety and stability of the transformer.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The oil retaining device is arranged in a transformer, wherein the transformer comprises a box, a winding and an iron core assembly, wherein the winding is arranged in the box, and at least part of the iron core assembly is passed through the winding; the oil retaining device comprises:

[0008] A bracket, located at one end of the winding close to the oil inlet of the box and connected to the core assembly;

[0009] An oil baffle is connected to the bracket, and the oil baffle blocks at least a portion of the gap between the winding and the box.

[0010] Optionally, along the first direction, grooves are alternately provided on two end surfaces of the oil baffle plate.

[0011] Optionally, an opening is provided on a side of the oil baffle plate facing the winding, and at least a portion of the winding is embedded in the opening.

[0012] Optionally, the bracket includes an integrated inverted U-shaped bracket; or, the bracket includes an inverted U-shaped bracket formed by connecting a first connecting arm, a second connecting arm and a third connecting arm in sequence, one end of the inverted U-shaped bracket is connected to the core assembly, and the other end is connected to the oil baffle.

[0013] Optionally, the core assembly includes a support plate, the first connecting arm includes at least two first clamping plates, and the first ends of the at least two first clamping plates are respectively clamped on both sides of the support plate and are fastened to the support plate;

[0014] The second connecting arm comprises at least two second clamping plates, and the first ends of at least two of the second clamping plates are alternately arranged and fastened to the second ends of at least two of the first clamping plates;

[0015] The third connecting arm comprises at least two third clamping plates, the second ends of at least two of the second clamping plates are alternately arranged and fastened to the first ends of at least two of the third clamping plates, and the oil baffle is arranged on a side of the third connecting arm away from the first connecting arm.

[0016] Optionally, the oil baffle device includes a plurality of first fastening components; a clamping space is formed between the two third clamping plates, a plurality of pads are arranged at intervals in the clamping space along the second direction, a limiting hole is formed between two adjacent pads, a plurality of first fixing holes are arranged on the oil baffle plate, the limiting holes correspond one-to-one to the first fixing holes, the first fastening components are sequentially passed through the limiting holes and the first fixing holes and fastened, and the first direction is perpendicular to the second direction.

[0017] Optionally, the oil retaining device further comprises a second fastening assembly, and the second fastening assembly is configured to fix the cushion block in the clamping space.

[0018] Optionally, the core assembly includes an iron core and a core clamp, at least a portion of the iron core is inserted into the winding, two core clamps are respectively clamped on both sides of the iron core, the two core clamps are respectively provided with the brackets on opposite sides, and each of the brackets is provided with the oil baffle.

[0019] Another object of the utility model is to provide a transformer. By providing the above-mentioned oil retaining device, the transformer can have better heat dissipation performance and safety during operation, thereby improving the service life and stability of the transformer.

[0020] To achieve this purpose, the utility model adopts the following technical solutions:

[0021] Transformer, including:

[0022] A box body, wherein along the first direction, one end of the box body is provided with an oil inlet, and the other end of the box body is provided with an oil outlet;

[0023] A cooler is arranged outside the box, and the oil outlet is connected with the oil inlet through the cooler;

[0024] A winding is arranged in the box;

[0025] The core assembly and the above-mentioned oil retaining device, at least part of the core assembly is inserted into the winding, and the oil retaining device is located at one end of the winding close to the oil inlet and connected to the core assembly.

[0026] Optionally, the core assembly comprises:

[0027] An iron core, comprising a plurality of first silicon steel sheets and a plurality of second silicon steel sheets, wherein the first silicon steel sheets are inserted into the winding, the second silicon steel sheets are respectively disposed at both ends of the first silicon steel sheets, and the plurality of first silicon steel sheets and the plurality of second silicon steel sheets are alternately stacked to form the iron core having a closed magnetic circuit;

[0028] The core clamps are configured such that along the first direction, two ends of the core are clamped and fixed by two core clamps respectively, and the oil retaining device is arranged on the core clamps.

[0029] Beneficial effects:

[0030] The oil baffle device provided in this embodiment has an oil baffle plate fixed to the oil inlet end of the winding close to the box body by a bracket and connected to the core assembly, providing a stable support structure for the oil baffle plate, avoiding the shaking of the oil baffle plate under the impact of oil flow, ensuring the stability of the oil baffle plate, and the oil baffle plate blocks at least part of the gap between the winding and the box body, forcing more cooling oil to enter the interior of the winding, thereby improving the thermal convection effect inside the winding, effectively reducing local overheating of the winding, and improving the safety and stability of the transformer.

[0031] The transformer provided by the utility model can provide the above-mentioned oil retaining device so that the transformer has better heat dissipation performance and safety during operation, thereby improving the service life and stability of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the oil retaining device provided by the utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the oil baffle of the utility model at one viewing angle;

[0034] Figure 3 It is a structural schematic diagram of the oil baffle of the utility model from another viewing angle;

[0035] Figure 4 yes Figure 1 A partial enlarged view of the middle A;

[0036] Figure 5 It is a structural schematic diagram of the cushion block provided by the utility model;

[0037] Figure 6 It is a structural schematic diagram of the bracket provided by the utility model;

[0038] Figure 7 The utility model discloses a circulating oil circuit diagram of a transformer provided with an oil retaining structure.

[0039] In the figure:

[0040] 10. Box; 11. Oil inlet; 12. Oil outlet; 20. Winding; 30. Core assembly; 31. First silicon steel sheet; 32. Second silicon steel sheet; 33. Core clamp; 34. Support plate; 40. Oil pump; 40. Cooler; 50. Oil pump;

[0041] 100, bracket; 110, first connecting arm; 111, first clamping plate; 120, second connecting arm; 121, second clamping plate; 130, third connecting arm; 131, third clamping plate; 132, clamping space; 1321, limiting hole; 133, cushion block; 1331, second penetration hole; 140, first fastening assembly; 141, first screw rod; 142, first nut; 150, second fastening assembly; 151, second screw rod; 152, second nut; 160, third fastening assembly; 170, fourth fastening assembly; 180, fifth fastening assembly;

[0042] 200, oil baffle; 210, groove; 220, opening; 230, first fixing hole;

[0043] 300, end plate assembly; 310, support plate; 320, insulating end plate; 330, first clamping block; 340, second clamping block. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] The oil-immersed transformer includes a box, a winding, a core assembly and a cooler. The winding is arranged in the box, and at least part of the core is arranged in the winding. During the operation of the transformer, the loss of its internal winding, core unit and other components will increase the internal temperature of the transformer. Therefore, the oil-immersed transformer is provided with transformer oil with good heat dissipation capacity in the box as a cooling and insulating medium. During the operation of the transformer, the loss of the internal components of the transformer causes the transformer oil to be heated, the density is reduced, and the oil flows upward with the help of buoyancy, causing the cold oil to replace the floating hot oil. The floating hot oil flows out through the oil outlet at the top of the box, and after being cooled by the external cooler, it returns to the box from the oil inlet at the bottom of the box. In this way, a closed oil circuit is formed. After the cold oil from the cooler enters the box from the oil inlet at the bottom of the box, part of the cold oil enters the winding, and part of the cold oil flows back to the cooler through the gap between the winding and the box. Since the oil flow resistance inside the winding is greater than the oil flow resistance between the winding and the box, under the action of the oil pump, most of the cold oil flows back to the cooler through the gap between the winding and the box.

[0049] In the prior art, an oil baffle is provided between the winding and the box body, so that more oil flowing out of the oil pump can enter the winding through the oil baffle. However, the oil baffle inside the existing transformer lacks stable structural support. The oil baffle is prone to shaking under the impact of the oil flow, which affects the oil blocking effect and makes the transformer prone to excessive internal average temperature and local overheating of the winding.

[0050] In order to solve the problems in the prior art, this embodiment provides an oil retaining device, which is arranged in the transformer, such as Figure 1-Figure 7 As shown, the oil baffle device includes a bracket 100 and an oil baffle plate 200. The bracket 100 is located at one end of the winding 20 close to the oil inlet 11 of the box body 10 and is connected to the core assembly 30. The oil baffle plate 200 is connected to the bracket 100. The bracket 100 provides a stable supporting structure for the oil baffle plate 200, thereby avoiding the shaking problem of the oil baffle plate 200 under the impact of oil flow and ensuring the stability of the oil baffle plate 200. Along the first direction, the distance between the oil baffle plate 200 and the oil inlet 11 is greater than the distance between the first end of the winding 20 and the oil inlet 11. The oil baffle plate 200 blocks at least part of the gap between the winding 20 and the box body 10. The oil baffle plate 200 can force more cooling oil to enter the interior of the winding 20, thereby improving the heat convection effect inside the winding 20, effectively reducing the local overheating of the winding 20, and improving the safety and stability of the transformer.

[0051] For UHV transformers, especially those with high voltage level on the high-voltage side, the oil baffle is set at the end of the winding close to the oil inlet, but it is close to the box, so there is a risk of discharge between the oil baffle and the box.

[0052] For this reason, Figure 1-Figure 3As shown, along the first direction, grooves 210 are alternately provided on the two end faces of the oil baffle plate 200. By alternately providing grooves on the two end faces of the oil baffle plate 200, the structural strength of the oil baffle plate 200 can be improved, and the creepage distance can be increased, thereby improving the insulation performance of the oil baffle plate 200, reducing the risk of discharge, and improving the safety of the transformer.

[0053] Alternatively, if Figure 1 and Figure 3 As shown, the oil baffle plate 200 is provided with an opening 220 on one side facing the winding 20, and at least part of the winding 20 is embedded in the opening 220, which can ensure the compactness of the oil baffle plate 200 and the winding 20, reduce the volume of the transformer, improve the utilization of space, and provide more flexibility for the installation and layout of the transformer. In this embodiment, the winding 20 is a hollow cylinder, and the opening 220 on the oil baffle plate 200 is an arc-shaped opening 220, so that the shape of the opening 220 is more in line with the shape of the winding 20. In other embodiments, the size and shape of the opening 220 are adaptively changed according to the size of the winding 20 to ensure that the oil baffle plate 200 and the winding 20 are more closely matched.

[0054] Alternatively, if Figure 4-Figure 6 As shown, the bracket 100 includes an inverted U-shaped bracket formed by sequentially connecting a first connecting arm 110, a second connecting arm 120 and a third connecting arm 130, one end of the inverted U-shaped bracket is connected to the core assembly 30, and the other end is connected to the oil baffle 200. The inverted U-shaped bracket design provides a stable support for the oil baffle 200, making the bracket 100 more stable when impacted by oil flow, effectively preventing shaking and deformation, improving the oil baffle effect, forcing more cooling oil to enter the interior of the winding 20, and improving the heat convection effect inside the winding 20.

[0055] In other embodiments, the bracket 100 includes an integrated inverted U-shaped bracket. By adopting the integrated inverted U-shaped bracket, the structural stability and durability of the oil baffle device are improved, while the installation process is simplified and the installation efficiency of the oil baffle plate 200 is improved.

[0056] Optionally, in this embodiment, two brackets 100 are provided along the third direction, and two oil baffles 200 are simultaneously connected to the two brackets 100, further ensuring the stability of the oil baffles 200. In this embodiment, the first direction, the second direction and the third direction are perpendicular to each other.

[0057] Optionally, the core assembly 30 includes a support plate 34, the first connecting arm 110 includes at least two first clamping plates 111, the first ends of the at least two first clamping plates 111 are respectively clamped on both sides of the support plate 34 and are fastened to the support plate 34; the second connecting arm 120 includes at least two second clamping plates 121, the first ends of the at least two second clamping plates 121 are alternately arranged and fastened to the second ends of the at least two first clamping plates 111; the third connecting arm 130 includes at least two third clamping plates 131, the second ends of the at least two second clamping plates 121 are alternately arranged and fastened to the first ends of the at least two third clamping plates 131. The bracket 100 is formed by splicing a plurality of clamping plates alternately arranged, which effectively improves the structural strength of the bracket 100, reduces the processing difficulty of the integrated bracket 100, improves the processing efficiency of the bracket 100, and can splice brackets 100 of different sizes according to the size of the actual use space, thereby improving the practicality of the bracket 100.

[0058] Optionally, the oil baffle device includes a plurality of first fastening assemblies 140, and the plurality of first fastening assemblies 140 are arranged on the oil baffle plate 200 at intervals along the second direction. The first fastening assemblies 140 are used to fix the oil baffle plate 200 on the third connecting arm 130, so as to realize rapid disassembly and assembly of the oil baffle plate 200, and enable the oil baffle plate 200 to better resist the impact of oil flow, prevent shaking and deformation, and force more cooling oil to enter the interior of the winding 20, thereby improving the heat convection effect inside the winding 20.

[0059] Alternatively, if Figure 3 and Figure 4 As shown, a clamping space 132 is formed between the two third clamping plates 131, and a plurality of pads 133 are arranged in the clamping space 132 along the second direction, and a limiting hole 1321 is formed between two adjacent pads 133. A plurality of first fixing holes 230 are arranged on the oil baffle plate 200, and the limiting holes 1321 correspond to the first fixing holes 230 one by one; the first fastening assembly 140 is sequentially inserted into the limiting holes 1321 and the first fixing holes 230 and fastened. The setting of the limiting holes 1321 effectively improves the stability of the first fastening assembly 140, avoids the displacement or loosening of the first fastening assembly 140, and improves the reliability of the connection between the oil baffle plate 200 and the bracket 100. In this embodiment, the first fastening assembly 140 includes a first screw 141 and a first nut 142, and the first screw 141 is sequentially inserted into the first fixing hole 230 and the limiting hole 1321, and the two ends of the first screw 141 are respectively threadedly connected with the first nut 142 and fastened.

[0060] Alternatively, if Figure 4As shown, the oil blocking device also includes a second fastening assembly 150, which is used to fix the cushion block 133 in the clamping space 132, thereby improving the stability of the cushion block 133 and further improving the stability of the first fastening assembly 140, thereby ensuring the stability of the oil blocking plate 200 during the operation of the transformer. In this embodiment, the second fastening assembly 150 includes a second screw 151 and a second nut 152, the cushion block 133 is provided with a second through hole 1331, and the third clamping plate 131 on both sides of the cushion block 133 is respectively provided with a first through hole and a third through hole, the second screw 151 is sequentially penetrated through the first through hole, the second through hole 1331 and the third through hole, and the second nuts 152 are respectively threadedly connected at both ends of the second screw 151 and fastened, thereby fixing the cushion block 133 in the clamping space 132.

[0061] Optionally, the core assembly 30 includes an iron core and a core clamp 33, at least part of the iron core is inserted into the winding 20, and two core clamps 33 are respectively clamped on both sides of the iron core. The two core clamps 33 are respectively provided with brackets 100 on the opposite sides, and each bracket 100 is provided with an oil baffle 200, which can further improve the oil blocking effect, force more cooling oil to enter the interior of the winding 20, improve the heat convection effect inside the winding 20, and effectively reduce the local overheating of the winding 20.

[0062] Alternatively, if Figure 4 As shown, in this embodiment, the first end of the first connecting arm 110 is fastened to the support plate 34 through the third fastening assembly 160, the second end of the first connecting arm 110 is fastened to the first end of the second connecting arm 120 through the fourth fastening assembly 170, and the second end of the second connecting arm 120 is connected to the first end of the third connecting arm 130 through the fifth fastening assembly 180. In this embodiment, the third fastening assembly 160, the fourth fastening assembly 170 and the fifth fastening assembly 180 have the same structure as the first fastening assembly 140, which will not be repeated here.

[0063] Optionally, the first screw 141 is a paper screw, the first nut 142 is a paper nut, and the first clamping plate 111, the second clamping plate 121, the third clamping plate 131, and the oil baffle plate 200 are all laminated paperboards, which can improve the insulation strength and safety of the oil baffle device, thereby further improving the safety of the transformer. In other embodiments, the first screw 141 and the first nut 142 can be made of wooden screws and wooden nuts, and the first clamping plate 111, the second clamping plate 121, the third clamping plate 131, and the oil baffle plate 200 can be made of wooden boards.

[0064] This embodiment also provides a transformer, such as Figure 1 and Figure 7As shown, the transformer includes a box body 10, a cooler 40, a winding 20, a core assembly 30 and the above-mentioned oil retaining device. Along the first direction, one end of the box body 10 is provided with an oil inlet 11, and the other end is provided with an oil outlet 12. The cooler 40 is arranged on the outside of the box body 10, and the oil outlet 12 is connected with the oil inlet 11 through the cooler 40. The winding 20 is arranged in the box body 10, and at least part of the core assembly 30 is penetrated in the winding 20. The oil retaining device is located at one end of the winding 20 close to the oil inlet 11 and is connected to the core assembly 30. The oil retaining device forces more cooling oil to enter the interior of the winding 20, thereby improving the heat convection effect inside the winding 20, effectively reducing the local overheating phenomenon of the winding 20, and improving the safety and stability of the transformer.

[0065] Optionally, the core assembly 30 includes a core and a core clamp 33, the core includes a plurality of first silicon steel sheets 31 and a plurality of second silicon steel sheets 32, the first silicon steel sheets 31 are inserted into the winding 20, the second silicon steel sheets 32 are respectively provided at both ends of the first silicon steel sheets 31, the plurality of first silicon steel sheets 31 and the plurality of second silicon steel sheets 32 are alternately stacked to form a core with a closed magnetic circuit, along the first direction, the two ends of the core are clamped and fixed by two core clamps 33, respectively, and the oil retaining device is provided on the core clamp 33. The core clamp 33 can ensure that the core is more stable, and the core clamp 33 provides a stable support foundation for the oil retaining device, thereby improving the stability of the oil retaining device.

[0066] Optionally, two core clamps 33 are clamped on both sides of the core and fixed by a fastening assembly to ensure the stability of the core in the box 10. In this embodiment, the core clamp 33 is a rectangular steel plate, the support plate 34 is welded on the rectangular steel plate, and the oil retaining device is insulated and connected to the support plate 34.

[0067] Optionally, the transformer further includes an end plate assembly 300 , and the two ends of the winding 20 are respectively provided with the end plate assembly 300 . The end plate assembly 300 can insulate and isolate the two ends of the winding 20 from the box body 10 , and can further improve the safety performance of the transformer.

[0068] In this embodiment, the end plate assembly 300 includes a support plate 310, an insulating end plate 320, a first clamp block 330 and a second clamp block 340. A plurality of first clamp blocks 330 and a plurality of second clamp blocks 340 are respectively arranged on both sides of the insulating end plate 320. The plurality of first clamp blocks 330 and the plurality of second clamp blocks 340 are distributed at intervals along the circumference of the insulating end plate 320. The first clamp blocks 330 and the second clamp blocks 340 are clamped on both sides of the insulating end plate 320 in a one-to-one correspondence. The support plate 310 supports the combination of the first clamp block 330, the insulating end plate 320 and the second clamp block 340, thereby ensuring the stability of the insulating end plate 320, further improving the insulation performance of the transformer winding 20, protecting the winding 20 from the influence of the external environment and electrical factors, and improving the safety and reliability of the transformer. In this embodiment, the insulating end plate 320 is a laminated paperboard.

[0069] Optionally, the transformer also includes an oil pump 50, the oil inlet 11 of the oil pump 50 is connected to the oil outlet 12 of the cooler 40, and the oil outlet 12 of the oil pump 50 is connected to the oil inlet 11 of the box 10. The oil pump 50 can improve the circulation efficiency of the transformer oil, thereby improving the heat dissipation efficiency of the transformer, and improving the safety and stability of the transformer.

[0070] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An oil retaining device, arranged in a transformer, the transformer comprising a box (10), a winding (20) and an iron core assembly (30), the winding (20) being arranged in the box (10), and at least a portion of the iron core assembly (30) being passed through the winding (20); characterized in that: The oil blocking device comprises: A bracket (100) is located at one end of the winding (20) close to the oil inlet (11) of the box (10) and is connected to the iron core assembly (30); An oil baffle plate (200) is connected to the bracket (100), and the oil baffle plate (200) blocks at least a portion of the gap between the winding (20) and the box (10).

2. The oil retaining device according to claim 1, characterized in that: Along the first direction, grooves (210) are alternately formed on the two end surfaces of the oil baffle plate (200).

3. The oil blocking device according to claim 1, characterized in that: An opening (220) is provided on one side of the oil baffle plate (200) facing the winding (20), and at least a portion of the winding (20) is embedded in the opening (220).

4. The oil blocking device according to claim 1, characterized in that: The bracket (100) comprises an integrated inverted U-shaped bracket; or, the bracket (100) comprises an inverted U-shaped bracket formed by sequentially connecting a first connecting arm (110), a second connecting arm (120) and a third connecting arm (130), wherein one end of the inverted U-shaped bracket is connected to the core assembly (30), and the other end is connected to the oil baffle (200).

5. The oil blocking device according to claim 4, characterized in that: The core assembly (30) comprises a support plate (34), the first connecting arm (110) comprises at least two first clamping plates (111), and the first ends of the at least two first clamping plates (111) are respectively clamped on both sides of the support plate (34) and are firmly connected to the support plate (34); The second connecting arm (120) comprises at least two second clamping plates (121), and the first ends of the at least two second clamping plates (121) are alternately arranged and fastened to the second ends of the at least two first clamping plates (111); The third connecting arm (130) comprises at least two third clamping plates (131), the second ends of at least two of the second clamping plates (121) and the first ends of at least two of the third clamping plates (131) are alternately arranged and fastened together, and the oil baffle plate (200) is arranged on a side of the third connecting arm (130) facing away from the first connecting arm (110).

6. The oil blocking device according to claim 5, characterized in that: The oil-blocking device comprises a plurality of first fastening components (140); a clamping space (132) is formed between the two third clamping plates (131); along the second direction, a plurality of cushion blocks (133) are arranged in the clamping space (132); a limiting hole (1321) is formed between two adjacent cushion blocks (133); a plurality of first fixing holes (230) are arranged on the oil-blocking plate (200); the limiting holes (1321) correspond to the first fixing holes (230) one by one; the first fastening components (140) are sequentially passed through the limiting holes (1321) and the first fixing holes (230) and fastened; and the first direction is perpendicular to the second direction.

7. The oil blocking device according to claim 6, characterized in that: The oil retaining device further comprises a second fastening assembly (150), wherein the second fastening assembly (150) is configured to fix the cushion block (133) in the clamping space (132).

8. The oil blocking device according to claim 1, characterized in that: The iron core assembly (30) comprises an iron core and an iron core clamp (33), at least a portion of the iron core is inserted into the winding (20), two iron core clamps (33) are respectively clamped on two sides of the iron core, and the brackets (100) are respectively provided on two opposite sides of the two iron core clamps (33), and each bracket (100) is provided with an oil baffle (200).

9. A transformer, characterized in that include: A box body (10), wherein along a first direction, one end of the box body (10) is provided with an oil inlet (11), and the other end is provided with an oil outlet (12); A cooler (40) is arranged outside the box (10), and the oil outlet (12) is connected to the oil inlet (11) through the cooler (40); A winding (20) is arranged in the box (10); The core assembly (30) and the oil-blocking device as described in any one of claims 1 to 7, wherein at least a portion of the core assembly (30) is inserted into the winding (20), and the oil-blocking device is located at one end of the winding (20) close to the oil inlet (11) and is connected to the core assembly (30).

10. The transformer according to claim 9, characterized in that: The core assembly (30) comprises: An iron core, comprising a plurality of first silicon steel sheets (31) and a plurality of second silicon steel sheets (32), wherein the first silicon steel sheets (31) are inserted into the winding (20), the second silicon steel sheets (32) are respectively arranged at both ends of the first silicon steel sheets (31), and the plurality of first silicon steel sheets (31) and the plurality of second silicon steel sheets (32) are alternately stacked to form the iron core having a closed magnetic circuit; The iron core clamp (33) is configured such that along the first direction, two ends of the iron core are respectively clamped and fixed by two of the iron core clamps (33), and the oil retaining device is arranged on the iron core clamp (33).

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