A control method for oil-immersed transformer based on transformer oil filtration

Abstract

The invention relates to the technical field of oil-immersed transformers, and discloses a control method for oil-immersed transformers based on transformer oil filtration. The filter screen performs a circular circular motion to filter the transformer oil in the oil tank, and the filter screen transfers the filtered impurities to the top of the filter screen moving track. At the same time, the brush moves back and forth in a straight line, and the brush sweeps the impurities filtered out by the filter screen at the top position of the filter screen moving track, so as to use the brush to sweep the impurities on the filter screen to the outside of the oil-immersed transformer, thereby performing real-time filtering on the transformer oil in the oil-immersed transformer, avoiding the presence of some precipitated impurities and other debris in the transformer oil after a long period of use, so as to prevent the stable operation of the transformer from being affected, and to improve the service life of the transformer oil, increase the maintenance time interval of the transformer, and improve the stability of the long-term operation of the transformer.

Description

Technical Field

[0001] The invention relates to the technical field of oil-immersed transformers, and in particular to a control method for an oil-immersed transformer based on transformer oil filtering. Background Art

[0002] In current power systems, oil-immersed transformers are often used when airtightness is required. The oil tank is the outer shell of the oil-immersed transformer. The iron core and winding of the transformer are placed in the oil tank, which is filled with transformer oil. Transformer oil, the main function of transformer oil is insulation, and the transformer oil is required to be very pure. However, during the operation of the transformer on site, the high temperature generated by the equipment will accumulate in the transformer oil, resulting in the accumulation of large molecular impurities in the transformer oil. If there are too many large molecular impurities, it will affect the insulation and high temperature performance of the transformer oil, and even cause the heat to be unable to dissipate, and the equipment to trip.

[0003] In the existing transformer, such as Chinese patent CN114288736B, the filtering mechanism is conducive to extracting and filtering the sediment on the inner side of the bottom of the transformer body, thereby ensuring the purity of the oil and reducing the loss of the transformer body, that is, by installing the cover plate, it is conducive to inserting the filter into the fixed shell, and by working the oil pump, it is conducive to extracting the oil on the inner side of the bottom of the transformer body and conveying it to the inside of the filter. Under the action of the filter, the oil is filtered and introduced into the first guide groove, and enters the inner side of the top of the transformer body through the conduit, which is conducive to filtering the oil on the inner side of the bottom of the transformer body under the action of cyclic pumping, thereby ensuring the purity of the oil inside the transformer body. At the same time, it is convenient to clean up the debris by taking out the cover plate and the filter. Under the action of the sealing ring, it is conducive to making the sealing between the cover plate and the fixed shell better, and will not cause oil overflow. Under the action of the transparent plate, it is convenient to observe the internal state of the filter from the outside, which is convenient for subsequent disassembly and cleaning.

[0004] However, there are still the following problems: the filtration of transformer oil in oil-immersed transformers is mostly carried out in a separate container in the oil tank. Due to the size of the container, the transformer needs to be shut down for cleaning sooner or later, which causes inconvenience to the long-term operation of the transformer and affects the stability of the long-term operation of the transformer. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a control method for an oil-immersed transformer based on transformer oil filtration, which has the advantages of performing real-time filtration processing on the transformer oil in the oil-immersed transformer, avoiding the presence of some precipitated impurities and other debris inside the transformer oil after a long period of use, so as to prevent affecting the stable operation of the transformer, prolonging the service life of the transformer oil, increasing the maintenance time interval of the transformer, and improving the long-term operation stability of the transformer, etc. The method solves the problem that the filtration of the transformer oil in the oil-immersed transformer is mostly filtered in a separate container in the oil tank, and due to the size of the container, the transformer needs to be shut down for cleaning sooner or later, which causes inconvenience to the long-term operation of the transformer and affects the long-term operation stability of the transformer.

[0006] To achieve the above object, the present invention provides the following technical solution: an oil-immersed transformer, comprising an oil tank, a transformer mechanism arranged on the oil tank, and a filter mechanism arranged on the oil tank, wherein the transformer mechanism comprises a high-voltage bushing and a low-voltage bushing, a plurality of the high-voltage bushings are fixedly installed on one side of the top of the oil tank, and the high-voltage bushings are used to connect the high-voltage line, and a plurality of the low-voltage bushings are fixedly installed on the other side of the top of the oil tank, and the low-voltage bushings are used to connect the low-voltage line;

[0007] The filtering mechanism includes a filter screen and a brush. A plurality of the filter screens are arranged next to the oil tank. The filter screens move in a circular cycle and filter the transformer oil. The brush is arranged next to the oil tank and is located directly above the filter screen as a whole. The brush is adjacent to the filter screen at the top of the filter screen's running track. The brush moves back and forth in a straight line and cleans the filter screen at the top of the filter screen's running track.

[0008] Preferably, the transformer mechanism also includes a lower clamp, which is fixedly installed on the bottom end of the oil tank, an iron core is fixedly installed on the lower clamp, the lower clamp is adapted to the iron core, an upper clamp is fixedly installed on the top end of the iron core, the iron core is adapted to the upper clamp, the upper clamp and the lower clamp are bolted together, and a coil is wound on the iron core.

[0009] Preferably, the upper clamp is provided with a plurality of connectors, the high-pressure bushing is electrically connected to the connector on one side of the upper clamp, the low-pressure bushing is electrically connected to the connector on the other side of the upper clamp, the connection line between the high-pressure bushing and the upper clamp passes through the wall of the oil tank, the connection line between the high-pressure bushing and the upper clamp is sealed with the oil tank, the connection line between the low-pressure bushing and the upper clamp passes through the wall of the oil tank, and the connection line between the low-pressure bushing and the upper clamp is sealed with the oil tank.

[0010] Preferably, a plurality of heat sinks are fixedly mounted on the four side walls of the oil tank, the heat sinks are distributed on the side walls of the oil tank, the heat sinks are connected to the oil tank, the heat sinks dissipate heat for the transformer oil in the oil tank, an oil drain valve is fixedly mounted on the bottom end of the side wall of the oil tank, the oil drain valve is connected to the oil tank, a rotating handle is provided on the oil drain valve, and the rotating handle of the oil drain valve controls the opening and closing of the passage of the oil drain valve.

[0011] Preferably, the filtering mechanism also includes an oil ring, which is a hollow annular structure and is fixedly mounted on one side of the oil tank. The bottom end of the oil ring is connected to the bottom end of the oil tank side wall, the upper part of the oil ring side wall is connected to the top of the oil tank side wall, the top of the oil ring is at a height higher than the top of the oil tank, and the top of the oil ring is an open end.

[0012] Preferably, annular rails are fixedly installed on both sides of the oil ring, the annular rails are matched with the inner ring of the oil ring, the annular rails penetrate the wall of the oil ring, the annular rails and the oil ring are sealed, a moving part is slidably matched on the annular rails, the shape of the moving part is matched with the shape of the annular rails, the moving part penetrates the annular rails, the moving part and the annular rails are sealed, the moving part is a soft material, so that the moving part rotates on the annular rails along the trajectory of the annular rails, a plurality of the filter screens are fixedly installed on the moving part, the filter screens are evenly distributed on the moving part, the filter screens are located in the oil ring, and the size of the filter screens is matched with the cross-sectional area of ​​the internal passage of the oil ring.

[0013] Preferably, a toothed belt is fixedly mounted on the movable member, the toothed belt is located outside the oil ring, the toothed belt is located in the inner ring of the oil ring, the shape of the toothed belt is adapted to the movable member, a driving gear is provided on the toothed belt, the driving gear is located at the top of the toothed belt, the driving gear is meshed with the toothed belt, a motor is fixedly mounted on the oil tank, and the shaft of the motor is fixedly connected to the shaft of the driving gear.

[0014] Preferably, a rail frame is fixedly installed on the top of the oil ring, the trajectory of the rail frame covers the open end of the top of the oil ring, the brush is slidably fitted on the rail frame, and the moving trajectory of the brush covers the top of the annular moving trajectory of the filter screen, an auxiliary frame is fixedly installed on one side of the brush, sliding rods are fixedly installed on both sides of the auxiliary frame, positioning sleeves are fixedly installed on both sides of the oil tank, the sliding rods on each side penetrate the positioning sleeves on each side, the sliding rods are slidably fitted with the positioning sleeves, an auxiliary moving plate is slidably fitted on the auxiliary frame, the moving trajectory of the auxiliary moving plate is perpendicular to the moving trajectory of the auxiliary frame, a cylindrical seat is fixedly installed on the auxiliary moving plate, an auxiliary gear is arranged next to the cylindrical seat, the auxiliary gear is meshed with the cylindrical seat, and the auxiliary gear is rotatably fitted on the oil ring.

[0015] Preferably, limiting arcs are fixedly installed on both sides of the auxiliary movable plate, and the limiting arcs are respectively located at the two ends of the cylindrical seat, the arc openings of the limiting arcs are relatively oriented, and the distance between the limiting arc and the cylindrical seat is adapted to the shaft diameter of the auxiliary gear, and a bevel gear set is provided on the oil ring, one end of the bevel gear set is dynamically connected to the driving gear, and the other end of the bevel gear set is dynamically connected to the auxiliary gear, and a shielding top cover is fixedly installed on the top of the oil ring, and the shielding top cover is located above the brush, and the size of the shielding top cover is larger than the coverage area of ​​the brush movement trajectory.

[0016] A control method based on transformer oil filtration uses the above-mentioned oil-immersed transformer.

[0017] Compared with the prior art, the present invention provides an oil-immersed transformer, which has the following beneficial effects:

[0018] 1. The oil-immersed transformer is installed at a position where the oil-immersed transformer needs to be installed, and the oil tank is fixedly installed so that the high-voltage bushing and the low-voltage bushing face upward, and then the high-voltage bushing is connected to the high-voltage line, and the low-voltage bushing is connected to the low-voltage line, and then the oil tank is filled with transformer oil, so that the oil-immersed transformer works normally. At the same time, the filter screen is in a circular circulation motion, and the filter screen filters the transformer oil in the oil tank, and the filter screen moves the filtered impurities to the top of the filter screen moving track. At the same time, the brush moves back and forth in a straight line, and the brush sweeps the impurities filtered by the filter screen at the top position of the filter screen moving track, so that the impurities on the filter screen are swept to the outside of the oil-immersed transformer by the brush, so as to filter the transformer oil in the oil-immersed transformer in real time, avoid the existence of some precipitated impurities and other debris in the transformer oil after a long period of use, so as to prevent the stable operation of the transformer from being affected, improve the service life of the transformer oil, increase the maintenance time interval of the transformer, and improve the stability of the long-term operation of the transformer.

[0019] 2. The oil-immersed transformer, through the setting of the cylindrical seat and the auxiliary gear, connects the linear reciprocating movement of the brush with the circular circulating movement power of the filter, so that the brush can operate without additional power. At the same time, the same power source makes the movement speed of the brush match the movement speed of the filter, which improves the stability of the operation of the oil-immersed transformer.

[0020] 3. The oil-immersed transformer, by setting a shielding top cover, uses the shielding top cover to shield the open end of the top of the oil ring, so as to prevent rain and snow from falling into the oil ring and prevent rain and snow from affecting the normal operation of the oil-immersed transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the oil-immersed transformer of the present invention;

[0022] Figure 2 It is a schematic diagram of the transformer structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of the fuel tank of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the filtering mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure distribution of the brush of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure distribution of the filter screen of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure distribution of the bevel gear set of the present invention;

[0028] Figure 8 It is a schematic diagram of the structural distribution of the auxiliary gear of the present invention.

[0029] In the figure: 1. oil tank; 2. transformer mechanism; 21. lower clamp; 22. iron core; 23. upper clamp; 24. coil; 25. high-voltage bushing; 26. low-voltage bushing; 27. heat sink; 28. oil drain valve; 3. filter mechanism; 31. oil ring; 32. annular rail; 33. moving part; 34. filter screen; 35. toothed belt; 36. driving gear; 37. motor; 38. rail frame; 39. brush; 310. auxiliary frame; 311. slide rod; 312. positioning sleeve; 313. auxiliary moving plate; 314. cylindrical seat; 315. auxiliary gear; 316. limit arc; 317. bevel gear set; 318. shielding top cover. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a control method for an oil-immersed transformer based on transformer oil filtration.

[0032] Example 1

[0033] In a typical implementation of the present application, Figure 1 As shown, an oil-immersed transformer comprises an oil tank 1, a transformer mechanism 2 arranged on the oil tank 1, and a filter mechanism 3 arranged on the oil tank 1, wherein the transformer mechanism 2 comprises a high-voltage bushing 25 and a low-voltage bushing 26, a plurality of high-voltage bushings 25 are fixedly mounted on one side of the top of the oil tank 1, and the high-voltage bushings 25 are used to connect the high-voltage line, and a plurality of low-voltage bushings 26 are fixedly mounted on the other side of the top of the oil tank 1, and the low-voltage bushings 26 are used to connect the low-voltage line;

[0034] The filtering mechanism 3 includes a filter screen 34 and a brush 39. A plurality of filter screens 34 are arranged next to the oil tank 1. The filter screens 34 move in a circular circulation. The filter screens 34 filter the transformer oil. A brush 39 is arranged next to the oil tank 1. The brush 39 is located directly above the overall filter screen 34. The brush 39 is adjacent to the filter screen 34 at the top of the filter screen 34 running track. The brush 39 moves back and forth in a straight line. The brush 39 cleans the filter screen 34 at the top of the filter screen 34 running track.

[0035] When using the present invention:

[0036] The oil-immersed transformer is installed at the required installation position, and the oil tank 1 is fixedly installed so that the high-voltage bushing 25 and the low-voltage bushing 26 face upward, and then the high-voltage bushing 25 is connected to the high-voltage line, and the low-voltage bushing 26 is connected to the low-voltage line, and then the oil tank 1 is filled with transformer oil, so that the oil-immersed transformer works normally. At the same time, the filter 34 is in a circular circulation motion, and the filter 34 filters the transformer oil in the oil tank 1. The filter 34 transfers the filtered impurities to the top of the moving track of the filter 34. At the same time, the brush 39 moves back and forth in a straight line, and the brush 39 sweeps the impurities filtered by the filter 34 at the top position of the moving track of the filter 34, so as to use the brush 39 to sweep the impurities on the filter 34 to the outside of the oil-immersed transformer, thereby filtering the transformer oil in the oil-immersed transformer in real time, avoiding the presence of some precipitated impurities and other debris in the transformer oil after a long period of use, so as to prevent the stable operation of the transformer from being affected, improve the service life of the transformer oil, increase the maintenance time interval of the transformer, and improve the stability of the long-term operation of the transformer.

[0037] Example 2

[0038] like Figure 2-3 As shown, the difference from the above embodiment is that the transformer mechanism 2 also includes a lower clamp 21, the lower clamp 21 is fixedly installed at the bottom end of the oil tank 1, an iron core 22 is fixedly installed on the lower clamp 21, the lower clamp 21 is adapted to the iron core 22, an upper clamp 23 is fixedly installed on the top of the iron core 22, the iron core 22 is adapted to the upper clamp 23, the upper clamp 23 and the lower clamp 21 are bolted, and a coil 24 is wound on the iron core 22.

[0039] Furthermore, the upper clamp 23 is provided with a plurality of connectors, the high-pressure bushing 25 is electrically connected to the connector on one side of the upper clamp 23, the low-pressure bushing 26 is electrically connected to the connector on the other side of the upper clamp 23, the connection line between the high-pressure bushing 25 and the upper clamp 23 passes through the wall of the oil tank 1, the connection line between the high-pressure bushing 25 and the upper clamp 23 is sealed with the oil tank 1, the connection line between the low-pressure bushing 26 and the upper clamp 23 passes through the wall of the oil tank 1, and the connection line between the low-pressure bushing 26 and the upper clamp 23 is sealed with the oil tank 1.

[0040] Furthermore, a plurality of heat sinks 27 are fixedly mounted on the four side walls of the oil tank 1. The heat sinks 27 are evenly distributed on the side walls of the oil tank 1. The heat sinks 27 are all connected to the oil tank 1. The heat sinks 27 dissipate heat for the transformer oil in the oil tank 1. An oil drain valve 28 is fixedly mounted on the bottom end of the side wall of the oil tank 1. The oil drain valve 28 is connected to the oil tank 1. A rotating handle is provided on the oil drain valve 28. The rotating handle of the oil drain valve 28 controls the opening and closing of the passage of the oil drain valve 28.

[0041] Example 3

[0042] like Figure 4-Figure 8 As shown, the difference from the above embodiment is that the filtering mechanism 3 also includes an oil ring 31, which is a hollow ring structure. The oil ring 31 is fixedly installed on one side of the oil tank 1, and the bottom end of the oil ring 31 is connected to the bottom end of the side wall of the oil tank 1, and the upper part of the side wall of the oil ring 31 is connected to the top of the side wall of the oil tank 1. The top of the oil ring 31 is at a height higher than the top of the oil tank 1, and the top of the oil ring 31 is an open end.

[0043] Furthermore, annular rails 32 are fixedly installed on both sides of the oil ring 31, and the annular rails 32 are adapted to the inner ring of the oil ring 31. The annular rails 32 all penetrate the wall of the oil ring 31, and the annular rails 32 and the oil ring 31 are sealed. A moving part 33 is slidably fitted on the annular rails 32, and the shape of the moving part 33 is adapted to the shape of the annular rails 32. The moving part 33 penetrates the annular rails 32, and the moving part 33 and the annular rails 32 are sealed. The moving part 33 is a soft material, so that the moving part 33 rotates on the annular rails 32 along the trajectory of the annular rails 32. A plurality of filter screens 34 are fixedly installed on the moving part 33, and the filter screens 34 are evenly distributed on the moving part 33. The filter screens 34 are located in the oil ring 31, and the size of the filter screens 34 is adapted to the cross-sectional area of ​​the internal passage of the oil ring 31.

[0044] Furthermore, a toothed belt 35 is fixedly mounted on the movable member 33. The toothed belt 35 is located outside the oil ring 31. The toothed belt 35 is located in the inner ring of the oil ring 31. The shape of the toothed belt 35 is adapted to the movable member 33. A driving gear 36 is provided on the toothed belt 35. The driving gear 36 is located at the top of the toothed belt 35. The driving gear 36 is meshed with the toothed belt 35. A motor 37 is fixedly mounted on the oil tank 1. The shaft of the motor 37 is fixedly connected to the shaft of the driving gear 36.

[0045] Furthermore, a rail frame 38 is fixedly installed on the top of the oil ring 31, and the track of the rail frame 38 covers the open end of the top of the oil ring 31. A brush 39 is slidably matched on the rail frame 38, and the moving track of the brush 39 covers the top of the annular moving track of the filter 34. An auxiliary frame 310 is fixedly installed on one side of the brush 39, and sliding rods 311 are fixedly installed on both sides of the auxiliary frame 310. Positioning sleeves 312 are fixedly installed on both sides of the oil tank 1, and the sliding rods 311 on each side are all penetrated. A positioning sleeve 312 is passed through each side, and the slide rod 311 is slidably matched with the positioning sleeve 312. An auxiliary movable plate 313 is slidably matched on the auxiliary frame 310. The moving trajectory of the auxiliary movable plate 313 is perpendicular to the moving trajectory of the auxiliary frame 310. A cylindrical seat 314 is fixedly installed on the auxiliary movable plate 313. An auxiliary gear 315 is arranged next to the cylindrical seat 314. The auxiliary gear 315 is meshed with the cylindrical seat 314, and the auxiliary gear 315 is rotatably matched on the oil ring 31.

[0046] Furthermore, limiting arcs 316 are fixedly installed on both sides of the auxiliary movable plate 313, and the limiting arcs 316 are respectively located at the two ends of the cylindrical seat 314, and the arc mouths of the limiting arcs 316 are relatively oriented. The distance between the limiting arcs 316 and the cylindrical seat 314 is adapted to the shaft diameter of the auxiliary gear 315. A bevel gear set 317 is provided on the oil ring 31, and one end of the bevel gear set 317 is power-connected to the driving gear 36, and the other end of the bevel gear set 317 is power-connected to the auxiliary gear 315. A shielding top cover 318 is fixedly installed on the top of the oil ring 31, and the shielding top cover 318 is located above the brush 39, and the size of the shielding top cover 318 is larger than the coverage area of ​​the moving trajectory of the brush 39.

[0047] The overall working principle of oil-immersed transformer:

[0048] The oil-immersed transformer is installed at the required installation position, and the oil tank 1 is fixedly installed so that the high-voltage bushing 25 and the low-voltage bushing 26 face upward, and then the high-voltage bushing 25 is connected to the high-voltage line, and the low-voltage bushing 26 is connected to the low-voltage line, and then the oil tank 1 is filled with transformer oil, so that the oil-immersed transformer works normally. At the same time, the filter 34 is in a circular circulation motion, and the filter 34 filters the transformer oil in the oil tank 1. The filter 34 transfers the filtered impurities to the top of the moving track of the filter 34. At the same time, the brush 39 moves back and forth in a straight line, and the brush 39 sweeps the impurities filtered by the filter 34 at the top position of the moving track of the filter 34, so as to use the brush 39 to sweep the impurities on the filter 34 to the outside of the oil-immersed transformer, thereby filtering the transformer oil in the oil-immersed transformer in real time, avoiding the presence of some precipitated impurities and other debris in the transformer oil after a long period of use, so as to prevent the stable operation of the transformer from being affected, improve the service life of the transformer oil, increase the maintenance time interval of the transformer, and improve the stability of the long-term operation of the transformer.

[0049] A control method based on transformer oil filtration uses the above-mentioned oil-immersed transformer.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer, comprising an oil tank (1), a transformer mechanism (2) arranged on the oil tank (1), and a filter mechanism (3) arranged on the oil tank (1), characterized in that: The transformer mechanism (2) comprises a high-voltage bushing (25) and a low-voltage bushing (26); a plurality of the high-voltage bushings (25) are fixedly mounted on one side of the top of the oil tank (1); the high-voltage bushings (25) are used to connect to a high-voltage line; a plurality of the low-voltage bushings (26) are fixedly mounted on the other side of the top of the oil tank (1); the low-voltage bushings (26) are used to connect to a low-voltage line; The filtering mechanism (3) comprises a filter screen (34) and a brush (39). A plurality of the filter screens (34) are arranged beside the oil tank (1). The filter screens (34) move in a circular manner. The filter screens (34) filter the transformer oil. The brush (39) is arranged beside the oil tank (1). The brush (39) is located directly above the filter screen (34) as a whole. The brush (39) is adjacent to the filter screen (34) at the top of the running track of the filter screen (34). The brush (39) moves back and forth in a straight line. The brush (39) cleans the filter screen (34) at the top of the running track of the filter screen (34). The filtering mechanism (3) further comprises an oil ring (31), the oil ring (31) being a hollow annular structure, the oil ring (31) being fixedly mounted on one side of the oil tank (1), the bottom end of the oil ring (31) being connected to the bottom end of the side wall of the oil tank (1), the top of the side wall of the oil ring (31) being connected to the top end of the side wall of the oil tank (1), the top end of the oil ring (31) being at a height higher than the top end of the oil tank (1), and the top end of the oil ring (31) being an open end. Annular rails (32) are fixedly mounted on both sides of the oil ring (31). The annular rails (32) are matched with the inner ring of the oil ring (31). The annular rails (32) penetrate the wall surface of the oil ring (31). The annular rails (32) and the oil ring (31) are sealed. A moving part (33) is slidably fitted on the annular rails (32). The shape of the moving part (33) is matched with the shape of the annular rails (32). The moving part (33) penetrates the annular rails (32). The moving part (33) 3) is sealed with the annular rail (32), the movable member (33) is made of soft material, so that the movable member (33) rotates on the annular rail (32) along the track of the annular rail (32), a plurality of filter screens (34) are fixedly mounted on the movable member (33), the filter screens (34) are evenly distributed on the movable member (33), the filter screens (34) are located in the oil ring (31), and the size of the filter screens (34) is adapted to the cross-sectional area of ​​the internal passage of the oil ring (31).

2. The oil-immersed transformer according to claim 1, characterized in that: The transformer mechanism (2) further comprises a lower clamp (21), the lower clamp (21) being fixedly mounted at the bottom end of the oil tank (1), an iron core (22) being fixedly mounted on the lower clamp (21), the lower clamp (21) being adapted to the iron core (22), an upper clamp (23) being fixedly mounted on the top end of the iron core (22), the iron core (22) being adapted to the upper clamp (23), the upper clamp (23) being bolted to the lower clamp (21), and a coil (24) being wound on the iron core (22).

3. The oil-immersed transformer according to claim 2, characterized in that: The upper clamp (23) is provided with a plurality of connectors, the high-voltage bushing (25) is electrically connected to a connector on one side of the upper clamp (23), the low-voltage bushing (26) is electrically connected to a connector on the other side of the upper clamp (23), the connection line between the high-voltage bushing (25) and the upper clamp (23) passes through the wall of the oil tank (1), the connection line between the high-voltage bushing (25) and the upper clamp (23) is sealed from the oil tank (1), the connection line between the low-voltage bushing (26) and the upper clamp (23) passes through the wall of the oil tank (1), and the connection line between the low-voltage bushing (26) and the upper clamp (23) is sealed from the oil tank (1).

4. The oil-immersed transformer according to claim 3, characterized in that: A plurality of heat sinks (27) are fixedly mounted on the four sides of the oil tank (1). The heat sinks (27) are distributed on the side walls of the oil tank (1). The heat sinks (27) are connected to the oil tank (1). The heat sinks (27) dissipate heat for transformer oil in the oil tank (1). An oil drain valve (28) is fixedly mounted on the bottom end of the side wall of the oil tank (1). The oil drain valve (28) is connected to the oil tank (1). A rotating handle is provided on the oil drain valve (28). The rotating handle of the oil drain valve (28) controls the opening and closing of the passage of the oil drain valve (28).

5. The oil-immersed transformer according to claim 4, characterized in that: A toothed belt (35) is fixedly mounted on the moving member (33). The toothed belt (35) is located in the inner ring of the oil ring (31). The shape of the toothed belt (35) matches the moving member (33). A driving gear (36) is provided on the toothed belt (35). The driving gear (36) is located at the top of the toothed belt (35). The driving gear (36) is meshed with the toothed belt (35). A motor (37) is fixedly mounted on the oil tank (1). The shaft of the motor (37) is fixedly connected to the shaft of the driving gear (36).

6. The oil-immersed transformer according to claim 5, characterized in that: A rail frame (38) is fixedly mounted on the top of the oil ring (31), the track of the rail frame (38) covers the open end of the top of the oil ring (31), the brush (39) is slidably fitted on the rail frame (38), the moving track of the brush (39) covers the top of the annular moving track of the filter (34), an auxiliary frame (310) is fixedly mounted on one side of the brush (39), sliding rods (311) are fixedly mounted on both sides of the auxiliary frame (310), and positioning sleeves (312) are fixedly mounted on both sides of the oil tank (1), and the sliding rods (311) on each side penetrate the sliding rods (311) on each side. The positioning sleeve (312), the slide rod (311) and the positioning sleeve (312) are slidably matched, the auxiliary frame (310) is slidably matched with an auxiliary moving plate (313), the moving track of the auxiliary moving plate (313) is perpendicular to the moving track of the auxiliary frame (310), a cylindrical seat (314) is fixedly mounted on the auxiliary moving plate (313), an auxiliary gear (315) is arranged next to the cylindrical seat (314), the auxiliary gear (315) is meshed with the cylindrical seat (314), and the auxiliary gear (315) is rotatably matched on the oil ring (31).

7. The oil-immersed transformer according to claim 6, characterized in that: Limiting arcs (316) are fixedly mounted on both sides of the auxiliary movable plate (313). The limiting arcs (316) are respectively located at the two ends of the cylindrical seat (314). The arc openings of the limiting arcs (316) face each other. The distance between the limiting arcs (316) and the cylindrical seat (314) matches the shaft diameter of the auxiliary gear (315). A bevel gear set (317) is arranged on the oil ring (31). One end of the bevel gear set (317) is connected to the driving gear (36) by power, and the other end of the bevel gear set (317) is connected to the auxiliary gear (315) by power. A shielding top cover (318) is fixedly mounted on the top of the oil ring (31). The shielding top cover (318) is located above the brush (39). The size of the shielding top cover (318) is larger than the coverage area of ​​the moving track of the brush (39).

8. A control method based on transformer oil filtration, characterized in that: The oil-immersed transformer according to any one of claims 1 to 7 is used.

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