Oil leakage detection device for oil-immersed transformer

Abstract

The invention discloses an oil-immersed transformer oil leakage detection device which comprises an oil-immersed transformer, a fence is arranged on the periphery of the oil-immersed transformer, a baffle is installed between the oil-immersed transformer and the fence, the baffle is arranged on the lower portion of the oil-immersed transformer, a spraying mechanism is installed at one end of the fence, and a spraying mechanism is installed at the other end of the fence. Cavities are formed in the two sides of the interior of the fence, liquid inlet grooves are formed in the sides, close to the baffles, of the cavities and communicate with the cavities, liquid discharging pipes are arranged at the bottoms of the ends, close to the spraying mechanisms, of the cavities and installed on the fence, and the ends, away from the cavities, of the liquid discharging pipes extend out of the fence. According to the oil-immersed transformer oil leakage detection device, the oil-immersed transformer is subjected to multi-directional water spraying through the spraying mechanism, whether oil leakage exists in the oil-immersed transformer or not is judged through discharged liquid, manual observation is not needed, the labor intensity of work is reduced, and the working efficiency of detection is improved.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, and specifically relates to an oil leakage detection device for oil-immersed transformers. Background Technology

[0002] Oil-immersed transformers are a new type of high-performance transformer with a more rational structure and superior performance. Their three-dimensional wound core, with its three core columns arranged in an equilateral triangle, has no air gaps in its magnetic circuit, resulting in tighter winding. The three magnetic circuits are of equal and shortest lengths, and the cross-sectional area of ​​the core columns is closer to a circle. Therefore, performance is further improved, losses are reduced, noise is reduced, three-phase balance is achieved, and the third harmonic component is reduced. This product is more suitable for power grid upgrades in urban and rural areas and industrial and mining enterprises, and is also more suitable for combined transformers and prefabricated substation transformers.

[0003] During the installation, operation, and maintenance of oil-immersed transformers, oil leakage may occur due to improper construction and installation, aging of operation, or environmental factors. Especially for unattended substations, prolonged oil leakage may develop into an emergency defect, forcing unplanned equipment shutdown and affecting the safe and stable operation of the power grid. Therefore, it is necessary to regularly inspect oil-immersed transformers for oil leakage. Currently, the method is mostly to manually inspect oil-immersed transformers for oil leakage. Because oil-immersed transformers are compact, some small locations are not convenient for observation, which requires a lot of effort, is labor-intensive, and has low work efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an oil leakage detection device for oil-immersed transformers. The device sprays water onto the oil-immersed transformer from multiple directions using a spray mechanism, and determines whether there is oil leakage by observing the discharged liquid. This eliminates the need for manual observation, reduces the labor intensity of the work, and improves the efficiency of the detection.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An oil leakage detection device for an oil-immersed transformer includes an oil-immersed transformer. A enclosure is provided around the oil-immersed transformer, and a baffle is installed between the oil-immersed transformer and the enclosure. The baffle is located at the lower part of the oil-immersed transformer. A spraying mechanism is installed at one end of the enclosure. Cavities are opened on both sides inside the enclosure. A liquid inlet is opened on the side of the cavity near the baffle and is connected to the cavity. A drain pipe is provided at the bottom of the cavity near the spraying mechanism. The drain pipe is installed on the enclosure and extends to the outside of the enclosure at the end away from the cavity.

[0006] The baffle includes a flat plate and an angle iron. There are two flat plates, which are symmetrically and obliquely installed on the lower part of the oil-immersed transformer. The two ends of the flat plates are fixedly connected to the oil-immersed transformer and the inside of the enclosure, respectively. The gap between the two flat plates is connected by the angle iron. The liquid inlet is opened on the top of the flat plates.

[0007] The spraying mechanism includes a water tank, a water pump, and a rectangular tube. The water tank is installed at the bottom of the enclosure, and the water pump is installed at the top of the water tank. The input end of the water pump is connected to the water tank, and the output end of the water pump is equipped with a U-shaped tube that extends into the interior of the enclosure. A rectangular tube is provided around the oil-immersed transformer, with the ends of the rectangular tube and the oil-immersed transformer at the same distance. Multiple spray nozzles are evenly and obliquely installed on the side of the rectangular tube closest to the oil-immersed transformer. One end of the rectangular tube is located above the U-shaped tube, and the U-shaped tube and the rectangular tube are connected by a flexible spring hose. Support blocks are installed on the top of both sides of the enclosure, and U-shaped rods are slidably installed on the support blocks. The bottom end of the U-shaped rod is connected to a lifting assembly, which is installed on the enclosure. The end of the U-shaped rod away from the lifting assembly is connected to the rectangular tube.

[0008] Preferably, a cleaning mechanism is installed on the enclosure. The cleaning mechanism includes threaded rods, a drive motor, a U-shaped frame, and a roller brush. Two threaded rods are rotatably mounted on the upper part of the mounting cavity. One end of each threaded rod extends to the outside of the enclosure and is fitted with a pulley. The two pulleys are connected by a belt. A housing is provided outside the pulleys and is mounted on the side wall of the enclosure. The end of each threaded rod is rotatably mounted on the housing. The drive motor is mounted on the housing and connected to one of the threaded rods. A slider is threadedly mounted on the threaded rod located inside the cavity. A cleaning brush is installed at the bottom, with its bottom and sides always in contact with the sidewall of the cavity. A connecting rod is installed at the top of the slider, with the end of the connecting rod extending into the interior of the enclosure. A through groove is provided on the sidewall of the enclosure for the connecting rod to move. A U-shaped frame is installed at the end of the connecting rod away from the slider, and the U-shaped frame is obliquely installed on the connecting rod. The inclination angle of the U-shaped frame is the same as the inclination angle of the flat plate. A first rotating shaft is rotatably installed at the bottom of the U-shaped frame, and the roller brush is installed on the first rotating shaft. Scrapers are installed at both ends of the U-shaped frame, and both the scrapers and the roller brush abut against the flat plate.

[0009] Preferably, the cleaning mechanism further includes a driving bevel gear, a driven bevel gear, and a support cylinder. Two driving bevel gears are installed at both ends of a first rotating shaft, located inside a U-shaped frame. A second rotating shaft is rotatably mounted through both ends of the top of the U-shaped frame. The driven bevel gear is installed at the bottom of the second rotating shaft and meshes with the driving bevel gear. A cam is installed on the top of the second rotating shaft. Two support cylinders are installed at both ends of the top of the U-shaped frame. The support cylinders hold cleaning fluid, and their bottoms extend through the U-shaped frame to above the roller brush. A support plate is provided on one side of the support cylinder, installed on the top of the U-shaped frame. A sliding groove is provided inside the support plate, and a movable plate is slidably installed in the groove. The movable plate divides the support cylinder in two. A through hole is provided on the movable plate, the diameter of which is the same as the diameter of the bottom of the support cylinder. One end of the movable plate abuts against the cam, and the other end is installed in the sliding groove inside the support plate via a spring.

[0010] Preferably, the slope at the bottom of the cavity gradually decreases from the drive motor toward the drain pipe.

[0011] Preferably, the number of cleaning brushes is multiple and they are staggered.

[0012] The beneficial effects of this invention are: 1) The oil-immersed transformer is sprayed with water from multiple directions by a spraying mechanism. The presence of oil leakage in the oil-immersed transformer can be determined by the discharged liquid. This eliminates the need for manual observation, reduces the labor intensity of the work, and improves the efficiency of the inspection.

[0013] 2) When oil leakage occurs in an oil-immersed transformer, a small amount of oil residue will remain on the plate and inside the cavity. With the cooperation of the cleaning mechanism and the spraying mechanism, the plate and the inside of the cavity are cleaned, thereby ensuring the accuracy of the next oil-immersed transformer test results.

[0014] 3) When the through hole on the movable plate coincides with the bottom of the bearing cylinder, the bearing cylinder is fully connected, and the cleaning fluid inside the bearing cylinder moves downward and drips onto the roller brush. When the through hole on the movable plate does not coincide with the bottom of the bearing cylinder, the cleaning fluid inside the bearing cylinder is blocked by the movable plate and will not move downward. By applying cleaning fluid to the roller brush, the flat plate and cavity can be cleaned better, thus improving the working efficiency of the cleaning mechanism.

[0015] 4) The slope at the bottom of the cavity gradually decreases from the self-driven motor towards the drain pipe, thereby ensuring that all the liquid inside the cavity is discharged through the drain pipe, preventing accumulation inside the cavity, and improving the efficiency of testing and cleaning work.

[0016] 5) The cleaning brushes are numerous and staggered, which can thoroughly clean the bottom of the cavity, prevent cleaning dead spots, and ensure the effectiveness of the cleaning mechanism. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the structure of an oil-immersed transformer oil leakage detection device according to the present invention.

[0018] Appendix Figure 2 This is a schematic diagram of the structure of an oil-immersed transformer oil leakage detection device from another perspective according to the present invention.

[0019] Appendix Figure 3 This is a schematic diagram of the internal structure of the enclosure in an oil-immersed transformer oil leakage detection device of the present invention.

[0020] Appendix Figure 4 This is a schematic diagram of the spray mechanism in an oil-immersed transformer oil leakage detection device of the present invention.

[0021] Appendix Figure 5 This is a schematic diagram of the cleaning mechanism in an oil-immersed transformer oil leakage detection device of the present invention.

[0022] Appendix Figure 6 This is a schematic diagram of the slider and U-shaped frame in an oil-immersed transformer oil leakage detection device of the present invention.

[0023] Appendix Figure 7 It is attached Figure 6 Enlarged view of part A in the middle.

[0024] Appendix Figure 8 This is a schematic diagram of the connection between the support plate and the movable plate in an oil-immersed transformer oil leakage detection device of the present invention.

[0025] Appendix Figure 9 This is a schematic diagram of the internal structure of the cavity of an oil-immersed transformer oil leakage detection device according to the present invention.

[0026] In the diagram: 1. Oil-immersed transformer; 2. Enclosure; 3. Baffle; 4. Sprinkler mechanism; 401. Water tank; 402. Water pump; 403. U-shaped tube; 404. Spring hose; 405. Rectangular tube; 406. Sprinkler head; 407. U-shaped rod; 408. Electric push rod; 409. Support block; 5. Cleaning mechanism; 501. Threaded rod; 502. Pulley; 503. Belt; 504. Housing; 505. Drive motor; 506. Slider 507. Cleaning brush; 508. U-shaped frame; 509. Connecting rod; 510. First rotating shaft; 511. Roller brush; 512. Driving bevel gear; 513. Driven bevel gear; 514. Second rotating shaft; 515. Cam; 516. Movable plate; 517. Bearing cylinder; 518. Through hole; 519. Support plate; 520. Scraper; 521. Slide groove; 522. Spring; 6. Cavity; 7. Liquid inlet groove; 8. Through groove; 9. Drain pipe. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0029] An oil leakage detection device for an oil-immersed transformer includes an oil-immersed transformer 1. A perimeter 2 is provided around the oil-immersed transformer 1, and a baffle 3 is installed between the transformer 1 and the perimeter 2. The baffle 3 is located at the lower part of the transformer 1. A spray mechanism 4 is installed at one end of the perimeter 2. Cavities 6 are formed on both sides inside the perimeter 2. A liquid inlet trough 7 is formed on the side of the cavity 6 near the baffle 3, and the liquid inlet trough 7 is connected to the cavity 6. A drain pipe 9 is provided at the bottom of the cavity 6 near the spray mechanism 4. The drain pipe 9 is installed within the perimeter 2. The baffle 3 extends from the end of the baffle 2 away from the cavity 6 to the outside of the enclosure 2. The baffle 3 includes a flat plate and an angle iron. There are two flat plates, which are symmetrically and obliquely installed at the bottom of the oil-immersed transformer 1. The two ends of the flat plates are fixedly connected to the inside of the oil-immersed transformer 1 and the enclosure 2, respectively. The gap between the two flat plates is connected by the angle iron. The liquid inlet 7 is opened above the flat plate. The baffle 3 facilitates the flow of liquid dripping from the oil-immersed transformer 1 to both sides into the cavity 6, avoiding accumulation on the baffle 3, thereby ensuring the normal operation of the testing work.

[0030] The spraying mechanism 4 includes a water tank 401, a water pump 402, and a rectangular tube 405. The water tank 401 is installed at the lower part of the enclosure 2, and the water pump 402 is installed at the top of the water tank 401. The input end of the water pump 402 is connected to the water tank 401, and a U-shaped tube 403 is installed at the output end of the water pump 402. The U-shaped tube 403 extends into the interior of the enclosure 2. A rectangular tube 405 is arranged around the oil-immersed transformer 1, and the rectangular tube 405 is equidistant from the end of the oil-immersed transformer 1. The rectangular tube 405 is close to the oil immersion... Multiple nozzles 406 are evenly and obliquely installed on one side of the transformer 1. One end of a rectangular tube 405 is located above a U-shaped tube 403. The U-shaped tube 403 and the rectangular tube 405 are connected by a spring hose 404. Support blocks 409 are installed on the top of both sides of the enclosure 2. U-shaped rods 407 are slidably installed on the support blocks 409. The bottom end of the U-shaped rods 407 is connected to a lifting assembly. The lifting assembly is installed on the enclosure 2 and drives the U-shaped rods 407 to move up and down. The lifting assembly is electrically powered. Rod 408 and U-shaped rod 407 are connected at the ends away from the lifting assembly to rectangular tube 405. Water pump 402 operates to deliver water from water tank 401 to U-shaped tube 403. Water in U-shaped tube 403 enters rectangular tube 405 through spring hose 404. Water in rectangular tube 405 is sprayed onto oil-immersed transformer 1 through nozzle 406. The lifting assembly drives U-shaped rod 407 to move up and down along support block 409, thereby causing rectangular tube 405 to move up and down, providing all-around water spraying to oil-immersed transformer 1. The dripping liquid enters the cavity 6 through the baffle 3 and the liquid inlet 7, and is finally discharged through the drain pipe 9. The discharged liquid is collected. Since oil is insoluble in water, the presence of oil in the water indicates that the oil-immersed transformer 1 is leaking oil, while the absence of oil in the water indicates that the oil-immersed transformer 1 is not leaking oil. By observing whether the water contains oil, it is possible to quickly detect whether the oil-immersed transformer 1 is leaking oil, thus improving the efficiency of the detection work.

[0031] A cleaning mechanism 5 is installed on the enclosure 2. The cleaning mechanism 5 includes a threaded rod 501, a drive motor 505, a U-shaped frame 508, and a roller brush 511. Two threaded rods 501 are rotatably mounted on the upper part of the cavity 6. One end of each threaded rod 501 extends to the outside of the enclosure 2 and is fitted with a pulley 502. The two pulleys 502 are connected by a belt 503. A housing 504 is provided outside each pulley 502. The housing 504 is mounted on the side wall of the enclosure 2. The end of each threaded rod 501 is rotatably mounted on the housing 504. The drive motor 505 is mounted on the housing 504 and connected to one of the threaded rods. A threaded rod 501 is connected to a slider 506 threadedly mounted on the threaded rod 501 located inside the cavity 6. A cleaning brush 507 is mounted on the bottom of the slider 506, and the bottom and side of the cleaning brush 507 are always in contact with the side wall of the cavity 6. A connecting rod 509 is mounted on the top of the slider 506, and the end of the connecting rod 509 extends into the interior of the enclosure 2. A through groove 8 is provided on the side wall of the enclosure 2 for the connecting rod 509 to move. A U-shaped frame 508 is mounted on the end of the connecting rod 509 away from the slider 506. The U-shaped frame 508 is obliquely mounted on the connecting rod 509, and the angle of inclination of the U-shaped frame 508 is the same as that of the flat plate. With consistent angles, a first rotating shaft 510 is rotatably mounted at the bottom of the U-shaped frame 508, and a roller brush 511 is mounted on the first rotating shaft 510. Scrapers 520 are installed at both ends of the U-shaped frame 508, and both the scrapers 520 and the roller brush 511 abut against the flat plate. The water pump 402 operates to transport water from the water tank 401 to the U-shaped pipe 403. The water in the U-shaped pipe 403 enters the rectangular pipe 405 through the spring hose 404, and the water in the rectangular pipe 405 is sprayed onto the flat plate through the nozzle 406. At the same time, the drive motor 505 operates, causing the two threaded rods 501 to rotate synchronously under the action of the pulley 502 and the belt 503. After the threaded rod 501 rotates, it drives the slider 506 to move along the threaded rod 501 in the cavity 6. When the slider 506 moves, the bottom cleaning brush 507 at its bottom washes the bottom of the cavity 6. The U-shaped frame 508 moves under the action of the connecting rod 509. The scraper 520 and roller brush 511 on the U-shaped frame 508 contact the plate to wash the plate. When the oil-immersed transformer 1 leaks oil, a small amount of oil will remain on the plate and inside the cavity 6. The plate and the inside of the cavity 6 are cleaned by the cooperation of the cleaning mechanism 5 and the spraying mechanism 4, thus ensuring the accuracy of the next test results of the oil-immersed transformer 1.

[0032] The cleaning mechanism 5 further includes a driving bevel gear 512, a driven bevel gear 513, and a support cylinder 517. Two driving bevel gears 512 are respectively installed at both ends of the first rotating shaft 510. The driving bevel gears 512 are located inside the U-shaped frame 508. A second rotating shaft 514 is rotatably mounted through both ends of the top of the U-shaped frame 508. The driven bevel gear 513 is installed at the bottom end of the second rotating shaft 514 and meshes with the driving bevel gear 512. The top of the second rotating shaft 514 is equipped with... There is a cam 515. Two support cylinders 517 are installed at the top ends of the U-shaped frame 508. The support cylinders 517 hold cleaning fluid. The bottom of each support cylinder 517 extends through the U-shaped frame 508 above the roller brush 511. A support plate 519 is provided on one side of each support cylinder 517. The support plate 519 is installed on the top of the U-shaped frame 508. A groove 521 is formed inside the support plate 519, and a movable plate 516 is slidably installed in the groove 521. The movable plate 516 divides the support cylinder 517 into two parts. A through hole 518 is provided on the plate 516. The diameter of the through hole 518 is the same as the diameter of the bottom end of the bearing cylinder 517. One end of the movable plate 516 abuts against the cam 515, and the other end is installed in the slide groove 521 inside the support plate 519 by a spring 522. When the roller brush 511 rolls, it drives the driving bevel gear 512 on the first rotating shaft 510 to rotate. The driven bevel gear 513 meshes with the driving bevel gear 512 and drives the cam 515 to rotate through the second rotating shaft 514. After the cam 515 rotates, it squeezes the movable plate 516, causing the movable plate to... 516 moves along the slide 521. When the through hole 518 on the movable plate 516 coincides with the bottom of the support cylinder 517, the support cylinder 517 is fully connected, and the cleaning fluid inside the support cylinder 517 moves downward and drips onto the roller brush 511. When the through hole 518 on the movable plate 516 does not coincide with the bottom of the support cylinder 517, the cleaning fluid inside the support cylinder 517 is blocked by the movable plate 516 and will not move downward. By applying cleaning fluid to the roller brush 511, the plate and cavity 6 can be cleaned better, thus improving the working efficiency of the cleaning mechanism 5.

[0033] The slope of the bottom of the cavity 6 gradually decreases from the drive motor 505 towards the drain pipe 9, thereby ensuring that all liquid inside the cavity 6 is discharged through the drain pipe 9, preventing accumulation inside the cavity 6, and improving the efficiency of detection and cleaning work. The cleaning brushes 507 are multiple and staggered, which can clean the bottom of the cavity 6 in all directions, prevent cleaning dead corners, and ensure the effectiveness of the cleaning mechanism 5.

[0034] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An oil-immersed transformer leakage oil detection device comprising an oil-immersed transformer, characterized by, The oil-immersed transformer is surrounded by a fence, and a baffle is installed between the oil-immersed transformer and the fence. The baffle is located at the bottom of the oil-immersed transformer. A spraying mechanism is installed at one end of the fence. Cavities are opened on both sides inside the fence. A liquid inlet is opened on the side of the cavity near the baffle and is connected to the cavity. A drain pipe is provided at the bottom of the cavity near the spraying mechanism. The drain pipe is installed on the fence and extends to the outside of the fence at the end away from the cavity.

2. The oil leakage detection device for oil-immersed transformers according to claim 1, characterized in that, The baffle includes a flat plate and an angle iron. There are two flat plates, which are symmetrically and obliquely installed on the lower part of the oil-immersed transformer. The two ends of the flat plates are fixedly connected to the oil-immersed transformer and the inside of the enclosure, respectively. The gap between the two flat plates is connected by the angle iron. The liquid inlet is opened on the top of the flat plates.

3. The oil leakage detection device for an oil-immersed transformer according to claim 1, characterized in that, The spraying mechanism includes a water tank, a water pump, and a rectangular tube. The water tank is installed at the bottom of the enclosure, and the water pump is installed at the top of the water tank. The input end of the water pump is connected to the water tank, and the output end of the water pump is equipped with a U-shaped tube that extends into the interior of the enclosure. A rectangular tube is provided around the oil-immersed transformer, with the ends of the rectangular tube and the oil-immersed transformer at the same distance. Multiple spray nozzles are evenly and obliquely installed on the side of the rectangular tube closest to the oil-immersed transformer. One end of the rectangular tube is located above the U-shaped tube, and the U-shaped tube and the rectangular tube are connected by a flexible spring hose. Support blocks are installed on the top of both sides of the enclosure, and U-shaped rods are slidably installed on the support blocks. The bottom end of the U-shaped rod is connected to a lifting assembly, which is installed on the enclosure. The end of the U-shaped rod away from the lifting assembly is connected to the rectangular tube.

4. The oil leakage detection device for an oil-immersed transformer according to claim 3, characterized in that, The lifting assembly is an electric push rod.

5. The oil leakage detection device for an oil-immersed transformer according to claim 1, characterized in that, A cleaning mechanism is installed on the enclosure. The cleaning mechanism includes threaded rods, a drive motor, a U-shaped frame, and a roller brush. Two threaded rods are rotatably mounted on the upper part of the mounting cavity. One end of each threaded rod extends to the outside of the enclosure and is fitted with a pulley. The two pulleys are connected by a belt. A housing is provided outside the pulleys and is mounted on the side wall of the enclosure. The end of each threaded rod is rotatably mounted on the housing. The drive motor is mounted on the housing and connected to one of the threaded rods. A slider is threaded onto the threaded rod located inside the cavity. The bottom of the slider... A cleaning brush is installed, with its bottom and sides always in contact with the sidewall of the cavity. A connecting rod is installed on the top of the slider, with the end of the connecting rod extending into the interior of the enclosure. A through groove is provided on the sidewall of the enclosure for the connecting rod to move. A U-shaped frame is installed at the end of the connecting rod away from the slider, and the U-shaped frame is obliquely installed on the connecting rod. The inclination angle of the U-shaped frame is the same as the inclination angle of the flat plate. A first rotating shaft is rotatably installed at the bottom of the U-shaped frame, and the roller brush is installed on the first rotating shaft. Scrapers are installed at both ends of the U-shaped frame, and both the scrapers and the roller brush abut against the flat plate.

6. The oil leakage detection device for an oil-immersed transformer according to claim 5, characterized in that, The cleaning mechanism also includes a driving bevel gear, a driven bevel gear, and a support cylinder. Two driving bevel gears are installed at both ends of a first rotating shaft, located inside a U-shaped frame. A second rotating shaft is rotatably mounted through both ends of the top of the U-shaped frame. The driven bevel gear is installed at the bottom of the second rotating shaft and meshes with the driving bevel gear. A cam is installed on the top of the second rotating shaft. Two support cylinders are installed at both ends of the top of the U-shaped frame. The support cylinders hold cleaning fluid and extend from the bottom of the U-shaped frame above the roller brush. A support plate is provided on one side of the support cylinder, mounted on the top of the U-shaped frame. A sliding groove is provided inside the support plate, and a movable plate is slidably installed in the groove. The movable plate divides the support cylinder in two. A through hole is provided on the movable plate, with the diameter of the through hole being the same as the diameter of the bottom of the support cylinder. One end of the movable plate abuts against the cam, and the other end is mounted in the sliding groove inside the support plate via a spring.

7. The oil leakage detection device for an oil-immersed transformer according to claim 1, characterized in that, The slope at the bottom of the cavity gradually decreases from the drive motor toward the drain pipe.

8. The oil leakage detection device for an oil-immersed transformer according to claim 5, characterized in that, The number of cleaning brushes is multiple and they are staggered.

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