Oil-immersed transformer

Abstract

The invention relates to an oil-immersed transformer, which relates to the technical field of oil-immersed transformers, and comprises a box body, a transformer main body, a support frame and a heat dissipation device, the transformer main body is mounted in a built-in cavity of the box body, and the built-in cavity is connected with the heat dissipation device through a pipe fitting I and a pipe fitting II; a plurality of pairs of branch pipes are arranged on the pipe fitting I and correspond to the three-phase windings one by one, each branch pipe consists of a pipe body I and a pipe body II, a temperature sensor is arranged at the top of each pipe body I, and a valve is arranged at the bottom of each pipe body I and can detect and preferentially guide local high-temperature oil circulation; the heat dissipation device comprises an oil storage barrel, a filter plate, a heat conduction plate and a fan device, the filter plate is obliquely installed in the oil storage barrel to collect impurities, the heat conduction plate penetrates through the oil storage barrel and is provided with a heat dissipation groove, heat dissipation is accelerated through blowing of the fan device, efficient heat dissipation is conducted on a local high-temperature area, hot spots are prevented from being formed, and the equipment reliability is improved.

Description

Technical Field

[0001] This invention relates to the technical field of oil-immersed transformers, and more particularly to an oil-immersed transformer. Background Technology

[0002] In the heat dissipation process of existing oil-immersed transformers, the overall oil circulation cooling method is usually adopted. It is difficult to effectively dissipate heat in specific high-temperature areas inside the transformer. This can easily lead to excessively high local oil temperature, forming hot spots (abnormally high-temperature areas), thereby accelerating the aging of insulation materials and shortening the service life of equipment. Traditional heat dissipation systems are inefficient and cannot prioritize the handling of sudden high-temperature areas, increasing the risk of equipment failure. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing an oil-immersed transformer. By setting up branch pipes corresponding to the three-phase windings and installing temperature sensors and valves on the branch pipes, priority circulation and heat dissipation of locally high-temperature oil can be achieved, thereby effectively preventing the formation of hot spots, improving heat dissipation efficiency, and extending service life.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: An oil-immersed transformer includes a tank, a transformer body, a support frame, and a heat dissipation device. The transformer body is detachably installed in the inner cavity of the tank. The transformer body includes clamps and three-phase windings. The support frame is bolted to the side of the tank. Pipe fitting one and pipe fitting two are respectively installed on the inner cavity of the tank below the bottom surface and on the side wall of the inner cavity near the top. One end of pipe fitting one is connected to oil pump one, and the other end of oil pump one is connected to pipe fitting four. Pipe fitting three is installed on the other end of pipe fitting two. The other ends of pipe fitting three and pipe fitting four are connected to the heat dissipation device.

[0005] The first pipe fitting is connected to multiple pairs of branch pipes. The position and number of branch pipes correspond one-to-one with the three-phase windings. Each branch pipe consists of a first pipe body and a second pipe body. The second pipe body is arranged perpendicularly to and connected to the first pipe body. The top and side ends of the first pipe body are respectively equipped with temperature sensors and rectangular through slots. A valve is installed at the bottom of the first pipe body.

[0006] The heat dissipation device includes a base, an oil storage tank, a filter plate, a heat conduction plate, and a fan device; the base is bolted to a support frame; the oil storage tank is mounted on the base, and an oil storage cavity is opened inside the oil storage tank. A through groove is opened on the outer arc surface of the oil storage tank, and a clamping plate is detachably connected to the through groove; a plug is threaded to the bottom of the oil storage tank.

[0007] A filter plate is installed obliquely and detachably inside the oil storage chamber. One end of the filter plate has a bent section for collecting impurities after oil filtration.

[0008] A fan is installed at one end of the oil storage tank; multiple heat-conducting vertical plates are equidistantly arranged at the bottom of the heat-conducting plate, and the heat-conducting plate and the heat-conducting vertical plates have interconnected heat dissipation grooves; the heat-conducting plate is fixed in the oil storage cavity and located at the lower end of the filter plate; one end of the heat-conducting plate passes through the oil storage tank and is connected to the fan, and the other end of the heat-conducting plate passes through the other end of the oil storage tank; the fan blows air into the heat dissipation grooves of the heat-conducting plate and the heat-conducting vertical plates, and blows the heat out through the heat dissipation grooves.

[0009] The other end of the pipe fitting three passes through the oil storage tank and extends into the oil storage cavity, and the other end of the pipe fitting three is equipped with an oil pump two; the other end of the pipe fitting four passes through the top of the oil storage tank and is located above the filter plate.

[0010] Furthermore, one end of the tube body is fixedly connected to a hollow cavity connector, which is made of a heat-conducting material and has an inner wall groove filled with paraffin wax. Its melting point is 55°C ± 5°C (which may be, but is not limited to) C, which is higher than the upper limit of the normal oil temperature of the transformer (50°C) but lower than the warning value of local hot spots in the winding (70°C), ensuring that it melts and absorbs heat quickly when the oil temperature rises abnormally, while avoiding false triggering under normal operating conditions. A hollow cavity heat dissipation pipe is fixedly connected to one side of the connector, and the other end of the heat dissipation pipe passes through one side of the housing.

[0011] Furthermore, one end of connector one is fixedly connected to connector two, which has a heat dissipation cavity. A heat-conducting column is fixedly connected to the top of the heat dissipation cavity, and the length of the heat-conducting column extends from the top of connector two to near the top of the housing. Multiple cross-shaped guide tubes are fixedly connected coaxially and equidistantly inside the heat-conducting column. The inside of the heat-conducting column is divided into connecting grooves by multiple cross-shaped guide tubes, and a bladder is fixedly connected inside the connecting grooves. The inside of the bladder is provided with multiple cross-shaped grooves coaxially, and the position and number of the cross-shaped grooves correspond one-to-one with the cross-shaped guide tubes. The inside of the bladder is divided into bladder cavities by multiple cross-shaped grooves, and the bladder cavities are filled with paraffin wax. The melting point temperature of the paraffin wax in the bladder cavities is 55°C-65°C (can be, but is not limited to, any temperature), and copper powder is provided on the inner wall of the bladder cavity to enhance heat conduction. This melting point is higher than that of the paraffin wax in connector one, for example, to handle high temperatures at the top of the winding or in concealed areas (such as oil temperatures reaching above 80°C under overload), providing secondary overheat protection. Copper powder is also provided on the inner wall of the bladder cavity to enhance heat transfer.

[0012] A base plate is fixed at the connection between the connecting groove and the heat dissipation cavity, which serves to limit the position of the bladder. The connecting groove, the cross guide tube, the base plate, and the heat-conducting pipe are all made of heat-conducting material. Multiple heat-conducting pipes are also fixed to the inner wall of the connecting groove, and the heat-conducting pipes pass through from the top surface of the connecting groove to the bottom surface of the heat dissipation cavity. The outer side of the bladder has slots corresponding to the heat-conducting pipes. Heat dissipation pipes two and three are fixed to one side of the connector two and communicate with the heat dissipation cavity. Heat dissipation pipes two and three pass through one side of the box. A miniature fan is provided on the other side of heat dissipation pipe two.

[0013] The beneficial effects of this invention are: The fitting has multiple branch pipes, each consisting of a pipe body and a rectangular through groove. Through the temperature sensor and valve installed on the pipe body, it can prioritize the cooling of high-temperature oil in different areas. Traditional oil-immersed transformers cannot prioritize the cooling of local hot oil. The cooling speed of oil circulation in a single area is slow, which can easily lead to local hot spots, accelerate insulation aging, and reduce service life.

[0014] Since the heat-conducting plate and the heat-conducting vertical plate extend from one end of the oil storage tank to the outside, the heat can be blown outward by the fan device into the heat dissipation slot, thus accelerating the dissipation of heat.

[0015] A filter plate is installed obliquely and detachably inside the oil storage chamber. One end of the filter plate has a bent section for collecting impurities, making it easy to remove during subsequent cleaning. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of an oil-immersed transformer; Figure 2 A schematic diagram of a half-section structure of the casing of an oil-immersed transformer; Figure 3 A schematic diagram of the internal cavity structure of the enclosure of an oil-immersed transformer; Figure 4 A schematic diagram of the slot location in an oil-immersed transformer; Figure 5 A schematic diagram of a heat-conducting plate structure for an oil-immersed transformer; Figure 6 A schematic diagram of the two positions of an oil pump in an oil-immersed transformer; Figure 7 A schematic diagram of the pipe structure of an oil-immersed transformer; Figure 8 A schematic diagram of the connecting component of an embodiment 2 of an oil-immersed transformer; Figure 9 A half-sectional view of the connecting component of an oil-immersed transformer according to Embodiment 2; Figure 10 A schematic diagram of the internal cavity structure of the housing of an oil-immersed transformer, embodiment 3; Figure 11 A schematic diagram of the heat pipe half-section structure of an oil-immersed transformer according to Embodiment 3; Figure 12 A schematic diagram of the cross-slot structure of an oil-immersed transformer, embodiment 3.

[0017] The attached diagram lists the components represented by each number as follows: 100. Enclosure; 101. Internal cavity; 102. Fitting 1; 1021. Oil pump 1; 103. Fitting 2; 110. Transformer body; 111. Clamping piece; 112. Three-phase winding; 120. Support frame; 130. Base; 200. Oil storage tank; 201. Oil storage cavity; 202. Through slot; 203. Clamping plate; 204. Hole plug; 210. Fan device; 220. Filter plate; 221. Bending section; 230. Heat-conducting plate; 231. Heat-conducting vertical plate; 232. Heat dissipation slot 1; 240. Fitting 3; 241. Oil pump 2; 250. Fitting 4; 260, Branch pipe; 261, Pipe body one; 262, Rectangular through groove; 263, Temperature sensor; 264, Pipe body two; 265, Valve; 270, Connector one; 2701, Hollow cavity; 271, Inner wall groove; 272, Heat dissipation pipe one; 280, Connector two; 2801, Heat dissipation cavity; 281, Heat-conducting column; 282, Connecting groove; 283, Cross-shaped guide tube; 284, Base plate; 285, Heat-conducting pipe; 286, Heat dissipation pipe two; 287, Heat dissipation pipe three; 288, Miniature fan; 290, Enclosure; 291, Cross groove; 292, Enclosure cavity. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of this application, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0021] Example 1 Please see Figures 1 to 7 This invention provides an oil-immersed transformer, including a housing 100, a transformer body 110, a support frame 120, and a heat dissipation device. The transformer body 110 is detachably installed in the internal cavity 101 of the housing 100. The transformer body 110 includes a clamp 111 and a three-phase winding 112. The support frame 120 is bolted to the side of the housing 100. Pipe fitting 102 and pipe fitting 203 are respectively installed inside the housing 100 below the bottom surface of the internal cavity 101 and on the side wall of the internal cavity 101 near the top. One end of pipe fitting 102 is connected to an oil pump 1021, and the other end of the oil pump 1021 is connected to pipe fitting 250. Pipe fitting 240 is installed at the other end of pipe fitting 203. The other ends of pipe fitting 240 and pipe fitting 250 are connected to the heat dissipation device.

[0022] The pipe fitting 102 is connected to multiple pairs of branch pipes 260. The position and number of branch pipes 260 correspond one-to-one with the three-phase winding 112. Each branch pipe 260 consists of a pipe body 261 and a pipe body 264. The pipe body 264 is arranged perpendicularly to and connected to the pipe body 261. The top and side ends of the pipe body 261 are respectively provided with a temperature sensor 263 and a rectangular through slot 262. A valve 265 is provided at the bottom of the pipe body 261.

[0023] The heat dissipation device includes a base 130, an oil storage tank 200, a filter plate 220, a heat-conducting plate 230, and a fan device 210; the base 130 is bolted to a support frame 120; the oil storage tank 200 is mounted on the base 130, the oil storage tank 200 has an oil storage cavity 201 inside, the outer arc surface of the oil storage tank 200 has a through groove 202, and a retaining plate 203 is detachably connected to the through groove 202; a plug 204 is threaded to the bottom of the oil storage tank 200.

[0024] A filter plate 220 is installed obliquely and detachably inside the oil storage chamber 201. One end of the filter plate 220 is provided with a bent section 221 for collecting impurities after oil filtration.

[0025] A fan device 210 is installed at one end of the oil storage tank 200; multiple heat-conducting vertical plates 231 are equidistantly arranged at the bottom of the heat-conducting plate 230, and the heat-conducting plate 230 and the heat-conducting vertical plates 231 have interconnected heat dissipation grooves 232; the heat-conducting plate 230 is fixed in the oil storage cavity 201 and located at the lower end of the filter plate 220; one end of the heat-conducting plate 230 passes through the oil storage tank 200 and is connected to the fan device 210, and the other end of the heat-conducting plate 230 passes through the other end of the oil storage tank 200; the fan device 210 blows air into the heat dissipation grooves 232 of the heat-conducting plate 230 and the heat-conducting vertical plates 231, and blows the heat out through the heat dissipation grooves 232.

[0026] The other end of pipe fitting 240 passes through oil storage tank 200 and extends into oil storage chamber 201. Oil pump 241 is provided at the end of the other end of pipe fitting 240. The other end of pipe fitting 250 passes through the top of oil storage tank 200 and is located above filter plate 220.

[0027] Specific implementation: When using this oil-immersed transformer, firstly, the support frame 120 is bolted to the side of the housing 100, and the base 130 is bolted onto the support frame 120. Then, the oil storage tank 200 is installed on the base 130. Connect the pipe fittings 250 and 240 of the oil storage tank 200 to the oil pump 1021 and pipe fitting 103, respectively. After completing the installation of the heat dissipation device, remove the retaining plate 203 to allow oil to flow into the oil storage tank 200. After the oil flow is complete, install the retaining plate 203 back onto the through slot 202. Start the oil pump 241, and the oil in the oil storage tank 200 flows through the pipe fittings 240 and 103 to the internal cavity of the housing 100. Inside 101, all valves 265 and oil pump 1021 are activated simultaneously, causing the oil in the internal cavity 101 to flow through the branch pipe 260, fitting 102, and fitting 250 to the oil storage chamber 201 of the oil storage tank 200. This allows the oil to circulate within the internal cavity 101 of the tank 100 and the oil storage chamber 201 of the oil storage tank 200. The fan device 210 is activated, blowing air into the heat dissipation groove 232 of the heat conduction plate 230 and the heat conduction vertical plate 231. Since the heat conduction plate 230 and the heat conduction vertical plate 231 extend through one end of the oil storage tank 200 to the outside, blowing air into the heat dissipation groove 232 can expel the heat and accelerate the dissipation of heat.

[0028] When one of the temperature sensors 263 detects that a certain local heat in the three-phase winding 112 is higher than that in other locations, the temperature sensor 263 at the corresponding high-temperature location transmits a signal to the control system (the control system is existing technology and will not be described in detail). The control system closes the valve 265 in the pipe body 261, which is far away from the high-temperature area. This allows the oil in the high-temperature area to preferentially pass through the corresponding pipe body 261 and pipe body 264. The high-temperature oil in this area circulates within the internal cavity 101 of the housing 100 and the oil storage cavity 201 of the oil storage tank 200, preferentially dissipating heat from the local high-temperature oil, preventing the formation of local hot spots, slowing down insulation aging, and improving service life.

[0029] After use, the card plate 203 can be removed to clean the impurities at the filter plate 220 and the bend section 221. After unscrewing the plug 204, the oil in the oil storage chamber 201 can be drained.

[0030] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: The fitting 102 is equipped with multiple branch pipes 260. Each branch pipe 260 consists of a pipe body 261 and a rectangular through groove 262. Through the temperature sensor 263 and valve 265 installed on the pipe body 261, the high-temperature oil in different areas can be preferentially cooled. Traditional oil-immersed transformer cooling cannot preferentially cool local hot oil. The oil circulation cooling speed in a single area is slow, which can easily lead to local hot spots, accelerate insulation aging, and reduce service life.

[0031] Since the heat-conducting plate 230 and the heat-conducting vertical plate 231 extend through one end of the oil storage tank 200 to the outside, the heat dissipation device 210 blows air into the heat dissipation slot 232, which can blow the heat outward and accelerate the dissipation of heat.

[0032] A filter plate 220 is installed obliquely and detachably inside the oil storage chamber 201. One end of the filter plate 220 is provided with a bent section 221 for collecting impurities and making it easy to remove during subsequent cleaning.

[0033] Example 2 Based on Example 1, although the branch pipe 260 can achieve local high-temperature oil preferential circulation, the heat dissipation response speed is still insufficient to completely suppress the problem of instantaneous overheating. Therefore, the pipe body 261 is improved. Please see Figure 8 and Figure 9This invention provides an oil-immersed transformer. One end of the tube body 261 is fixedly connected to a connector 270 with a hollow cavity 2701. The connector 270 is made of a heat-conducting material and has an inner wall groove 271. The inner wall groove 271 is filled with paraffin wax with a melting point of 55°C ± 5°C (which may or may not be limited to). This temperature is higher than the upper limit of the normal oil temperature of the transformer (50°C) but lower than the warning value of local hot spots in the winding (70°C), ensuring that the oil melts and absorbs heat quickly when the oil temperature rises abnormally, while avoiding false triggering under normal operating conditions.

[0034] One side of the connector 270 is fixed with a heat dissipation pipe 272 of the hollow cavity 2701, and the other end of the heat dissipation pipe 272 passes through one side of the box 100 (the connection with the side wall of the box 100 is sealed).

[0035] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: When the temperature sensor 263 detects a high temperature in the corresponding area, the connector 270 absorbs the high temperature of the hot oil and transfers it to the paraffin in the inner wall groove 271. The paraffin absorbs the excess heat through a solid-liquid phase change and transfers the heat to the hollow cavity 2701. Finally, the heat is transferred to the outside of the housing 100 through the heat dissipation pipe 272, thereby reducing the rate of oil temperature rise under sudden overheating conditions.

[0036] The design of paraffin wax filling the inner wall groove 271 allows it to absorb some heat during the high-temperature oil circulation process, accelerating the heat dissipation rate of the corresponding area and further reducing the formation of local hot spots.

[0037] Example 3 Although Embodiment 2 can accelerate the heat dissipation of known high temperature points, it cannot cover hidden hot spots far away from temperature sensor 263. For example, local high temperature areas may form from different heights of the three-phase winding 112 (positions far away from temperature sensor 263). If temperature sensor 263 does not detect in time, local hot spots will form, and there is a risk of heat dissipation failure when the oil pump or heat dissipation device fails. Therefore, the connector 270 is improved. Please see Figures 10 to 12 This invention provides an oil-immersed transformer. One end of the first connector 270 is fixedly connected to a second connector 280. The second connector 280 has a heat dissipation cavity 2801. A heat-conducting column 281 is fixedly connected to the top of the heat dissipation cavity 2801. The length of the heat-conducting column 281 extends from the top of the second connector 280 to near the top of the housing 100. Multiple cross-shaped guide tubes 283 are fixedly connected coaxially and equidistantly inside the heat-conducting column 281. The inside of the heat-conducting column 281 is divided into connecting slots 282 by the multiple cross-shaped guide tubes 283. A bladder 290 is fixedly connected inside the connecting slots 282.

[0038] The interior of the capsule 290 is provided with multiple coaxial cross grooves 291, the position and number of which correspond one-to-one with the cross guide tube 283. The interior of the capsule 290 is divided into capsule cavities 292 by the multiple cross grooves 291. The capsule cavities 292 are filled with paraffin wax. The melting point of the paraffin wax in the capsule cavities 292 is 55°C-65°C (which may or may not be limited to). Copper powder is provided on the inner wall of the capsule cavity to enhance thermal conductivity. This melting point is higher than that of the paraffin wax in the connector 270. For example, it is used to handle high temperatures at the top of the winding or in concealed areas (such as oil temperature reaching above 80°C under overload), providing secondary overheat protection. Copper powder is also provided on the inner wall of the capsule cavities 292 to enhance heat transfer.

[0039] A base plate 284 is fixedly connected to the connection between the connecting groove 282 and the heat dissipation cavity 2801, which serves to limit the position of the bladder 290. The connecting groove 282, the cross-shaped guide tube 283, the base plate 284 and the heat-conducting pipe 285 are all made of heat-conducting material. Multiple heat-conducting pipes 285 are also fixedly connected to the inner wall of the connecting groove 282. The heat-conducting pipes 285 extend from the top surface of the connecting groove 282 to the bottom surface of the heat dissipation cavity 2801.

[0040] The outer side of the bladder 290 is provided with a slot corresponding to the heat conduction pipe 285; one side end of the connector 280 is fixedly connected to the heat dissipation pipe 286 and the heat dissipation pipe 287 and communicates with the heat dissipation cavity 2801; the heat dissipation pipe 286 and the heat dissipation pipe 287 penetrate one side end of the box 100 (the connection with the side wall of the box 100 is sealed); the other side end of the heat dissipation pipe 286 is provided with a miniature fan 288.

[0041] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: When a localized high temperature is formed at a location far from the temperature sensor 263, the high temperature transfers heat to the paraffin inside the heat pipes 285 and 292 through the heat-conducting column 281. Due to the design of the cross-shaped conduit 283, oil and heat can pass through the central area of ​​the solid paraffin, improving the heat absorption effect of the paraffin. While the heat-conducting pipe 285 absorbs heat, it also transfers heat towards the direction closer to the heat dissipation cavity 2801, causing the paraffin inside the bladder 290 through which the heat-conducting pipe 285 passes to absorb heat and melt. The heat is then transferred to the heat dissipation cavity 2801 through the base plate 284 and the heat-conducting pipe 285. The heat is then blown away from the heat inside the second heat dissipation pipe 286 by the micro fan 288 (the micro fan 288 blows air in the opposite direction to the heat dissipation cavity 2801, that is, external air enters from the third heat dissipation pipe 287 and carries away the heat inside the heat dissipation cavity 2801, moving it from the second heat dissipation pipe 286 to the outside).

[0042] If the cooling device or oil pump suddenly fails, the oil circulation and forced cooling will be interrupted, and the oil temperature will rise rapidly. At this time, the paraffin inside the capsule 290 will melt quickly, absorb the heat of the oil, slow down the rate of oil temperature rise, buy time for troubleshooting and emergency handling, reduce the risk of transformer burning out due to overheating, and improve the safety redundancy of the equipment.

[0043] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0044] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An oil-immersed transformer, comprising a housing (100), a transformer body (110), a support frame (120), and a heat dissipation device, wherein the transformer body (110) is detachably installed within the internal cavity (101) of the housing (100), and the transformer body (110) includes a clamp (111) and three-phase windings (112), characterized in that, The support frame (120) is bolted to the side of the box (100); the bottom of the inner cavity (101) is provided with a pipe fitting (102) and a pipe fitting (103) respectively. One end of the pipe fitting (102) is connected to an oil pump (1021), and the other end of the oil pump (1021) is connected to a pipe fitting (250). The other end of the pipe fitting (103) is provided with a pipe fitting (240), and the other ends of the pipe fitting (240) and the pipe fitting (250) are connected to a heat dissipation device. The first pipe fitting (102) is connected to multiple pairs of branch pipes (260). The position and number of branch pipes (260) correspond one-to-one with the three-phase winding (112). The branch pipe (260) is composed of a first pipe body (261) and a second pipe body (264). The second pipe body (264) is arranged perpendicularly to the first pipe body (261) and connected to it. The top and side ends of the first pipe body (261) are respectively provided with a temperature sensor (263) and a rectangular through groove (262). A valve (265) is provided at the bottom of the first pipe body (261). One end of the first pipe body (261) is fixedly connected to a connector (270) with a hollow cavity (2701). The connector (270) is made of heat-conducting material. The connector (270) has an inner wall groove (271) and is filled with paraffin wax.

2. The oil-immersed transformer as described in claim 1, characterized in that, One side of the connector (270) is fixed with a heat dissipation pipe (272) of a hollow cavity (2701), and the other end of the heat dissipation pipe (272) passes through one side of the housing (100).

3. An oil-immersed transformer as described in claim 2, characterized in that, One end of the first connector (270) is fixedly connected to the second connector (280). The second connector (280) has a heat dissipation cavity (2801) inside. A heat-conducting column (281) is fixedly connected to the top of the heat dissipation cavity (2801). The length of the heat-conducting column (281) extends from the top of the second connector (280) to the top near the top of the box body (100). Multiple cross-shaped guide tubes (283) are fixedly connected coaxially and equidistantly inside the heat-conducting column (281). The interior of the heat-conducting column (281) is divided into connecting grooves (282) by multiple cross-shaped guide tubes (283). A bladder (290) is fixedly connected inside the connecting grooves (282).

4. An oil-immersed transformer as described in claim 3, characterized in that, The inside of the capsule (290) is provided with multiple cross grooves (291) on the same axis. The position and number of the cross grooves (291) correspond one-to-one with the cross catheter (283). The inside of the capsule (290) is divided into capsule cavities (292) by multiple cross grooves (291). The capsule cavities (292) are filled with paraffin. Copper powder is also provided on the inner wall of the capsule cavities (292).

5. An oil-immersed transformer as described in claim 4, characterized in that, A base plate (284) is fixedly connected to the connection between the connecting groove (282) and the heat dissipation cavity (2801), which serves to limit the position of the bladder (290). The connecting groove (282), the cross-shaped guide tube (283), the base plate (284) and the heat-conducting pipe (285) are all made of heat-conducting material. Multiple heat-conducting pipes (285) are also fixedly connected to the inner wall of the connecting groove (282). The heat-conducting pipes (285) penetrate from the top surface of the connecting groove (282) to the bottom surface of the heat dissipation cavity (2801).

6. An oil-immersed transformer as described in claim 5, characterized in that, The outer side of the bladder (290) is provided with a slot corresponding to the heat conduction pipe (285); one side end of the connector (280) is fixedly connected to the heat dissipation pipe (286) and the heat dissipation pipe (287) and communicates with the heat dissipation cavity (2801); the heat dissipation pipe (286) and the heat dissipation pipe (287) pass through one side end of the box (100); the other side end of the heat dissipation pipe (286) is provided with a miniature fan (288).

7. An oil-immersed transformer as described in claim 1, characterized in that, The heat dissipation device includes a base (130), an oil storage tank (200), a filter plate (220), a heat conduction plate (230), and a fan device (210); the base (130) is bolted to a support frame (120); the oil storage tank (200) is mounted on the base (130), the oil storage tank (200) has an oil storage cavity (201) inside, the outer arc surface of the oil storage tank (200) has a through groove (202), and a retaining plate (203) is detachably connected to the through groove (202); the bottom of the oil storage tank (200) is threaded with a plug (204).

8. An oil-immersed transformer as described in claim 7, characterized in that, A filter plate (220) is installed obliquely and detachably inside the oil storage chamber (201). One end of the filter plate (220) is provided with a bent section (221) for collecting impurities after oil filtration. The other end of the pipe fitting three (240) passes through the oil storage tank (200) and extends into the oil storage chamber (201). The other end of the pipe fitting three (240) is provided with an oil pump two (241). The other end of the pipe fitting four (250) passes through the top of the oil storage tank (200) and is located above the filter plate (220).

9. An oil-immersed transformer as described in claim 8, characterized in that, A fan device (210) is installed at one end of the oil storage tank (200); multiple heat-conducting uprights (231) are provided at equal intervals at the bottom of the heat-conducting plate (230), and the heat-conducting plate (230) and the heat-conducting uprights (231) have a connected heat dissipation groove (232); the heat-conducting plate (230) is fixed in the oil storage cavity (201) and located at the lower end of the filter plate (220); one end of the heat-conducting plate (230) passes through the oil storage tank (200) and is connected to the fan device (210), and the other end of the heat-conducting plate (230) passes through the other end of the oil storage tank (200); the fan device (210) blows air into the heat dissipation groove (232) of the heat-conducting plate (230) and the heat-conducting uprights (231), and blows the heat out through the heat dissipation groove (232).

10. An application of an oil-immersed transformer as described in any one of claims 1 to 9 in the field of oil-immersed transformers.

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