Intelligent large transformer testing device

Abstract

The invention discloses an intelligent large-scale transformer testing device, and the device comprises a frame which is provided with rollers at the lower ends of four supporting legs; the power supply system is assembled on the upper portion of one side of the rack, a power cable is connected to the power supply system, and the other end of the power cable is electrically connected with the transformer; the leakage side unit is mounted above the frame, and two guide rails are symmetrically fixed on the frame; the lower end of the side leakage unit is in sealed butt joint with an oil seal pipe of the transformer; the air control device is arranged on the other side of the frame, and the air control device is communicated with the side leakage unit; according to the invention, the leakage detection unit can test the sealing performance of the oil tank of the transformer, thereby detecting whether the oil tank of the transformer leaks liquid or not; in the test, mechanical vibration generated by electromagnetic force, cooling system work and the like in real operation of the transformer is simulated, so that the detection result is closer to the actual working condition, and the reliability is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, specifically an intelligent large transformer testing device. Background Technology

[0002] Transformer oil (insulating oil) performs two core functions: insulation and cooling. Once the oil tank leaks, the drop in oil level exposes critical internal live components (such as coils and leads) to air, causing a sharp decrease in insulation strength and making them highly susceptible to catastrophic failures (such as breakdown or explosion) such as internal short circuits and arc discharges. Currently, large transformers are enormous in size and weight, making them extremely difficult and costly to move. Traditional fixed leak detection equipment (such as hydrostatic testing benches and large vacuum tanks) requires transporting the entire transformer to a specific laboratory or workshop. This results in high transportation and hoisting costs, poses safety risks, and makes regular inspection of already installed and operational transformers virtually impossible.

[0003] Furthermore, traditional static testing cannot detect intermittent or fatigue leaks caused by dynamic stresses such as vibration and thermal expansion and contraction. Most traditional leak detection methods are performed when the transformer tank is stationary. However, transformers are subjected to continuous vibrations during operation due to electromagnetic forces and the activation of the cooling system. Some leaks (such as weld fatigue cracks and loose seals) only appear or worsen under vibration conditions. Products that pass static testing may exhibit dynamic leaks during operation.

[0004] Therefore, it is necessary to provide an intelligent large transformer testing device to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent large transformer testing device, comprising:

[0006] The frame has casters installed at the lower ends of its four supporting legs;

[0007] A power supply system is mounted on one side of the frame, and a power cable is connected to the power supply system, the other end of which is electrically connected to a transformer.

[0008] A side leakage unit is installed on top of a frame, on which two guide rails are symmetrically fixed. The side leakage unit is slidably connected to each of the guide rails via a sliding block. The lower end of the side leakage unit is sealed and connected to the oil seal pipe of the transformer.

[0009] A pneumatic control device is located on the other side of the frame, and the pneumatic control device is connected to the side leakage unit.

[0010] Furthermore, as a preferred embodiment, the power supply system is equipped with an overcurrent protector and an overvoltage protector.

[0011] Furthermore, preferably, the side leakage unit includes:

[0012] The top plate is horizontally slidably mounted on the guide rail, and a base plate is fixed parallel to the bottom of the top plate by a support rod;

[0013] A fixing frame is vertically fixed to the upper end face of the substrate, and a threaded screw is rotatably connected to the fixing frame;

[0014] An air guide tube is vertically installed on one side of the fixed frame. A positioning seat is slidably connected to the threaded screw via threads, and the upper end of the air guide tube is fixed to the positioning seat.

[0015] An air seal plate is coaxially disposed at the lower end of the air guide pipe, and the air seal plate is sealed to the oil seal pipe.

[0016] An air nozzle is fixed to the lower end face of the air duct, and the air nozzle extends into the transformer's oil tank.

[0017] Furthermore, preferably, the pneumatic control device includes:

[0018] The main pipe is horizontally mounted on the frame, and one end of the main pipe is connected to the side leakage unit via an adapter pipe;

[0019] The mounting bracket is fixed on the frame, and a vacuum pump is installed inside the frame. The vacuum pump is sealed and connected to the other end of the main pipe.

[0020] Gas cylinder one and gas cylinder two are vertically fixed on the frame and located on one side of the mounting bracket. The delivery ports of gas cylinder one and gas cylinder two are connected to diversion pipes.

[0021] A gas delivery unit is fixed on one side of the mounting frame. The other end of each of the branch pipes is connected to the gas delivery unit. A branch pipe is connected to the outside of the gas delivery unit, and the other end of the branch pipe is connected to the main pipe.

[0022] Electromagnetic control valve one is installed on the main pipe, and electromagnetic control valve two is connected between the branch pipe and the main pipe.

[0023] Furthermore, as a preferred embodiment, the first gas cylinder contains high-pressure helium gas, and the second gas cylinder contains fluorescent tracer gas.

[0024] Furthermore, preferably, the gas delivery unit includes:

[0025] A fixed cylinder, with an air guide tube fixed at its center;

[0026] A valve core is slidably connected inside the air guide cylinder, and a valve hole is provided inside the air guide cylinder. One end of the valve core is slidably sealed to the valve hole.

[0027] An internal telescopic device is installed inside a fixed cylinder, and the telescopic end of the internal telescopic device is connected to the valve core;

[0028] An air guiding device is installed at one end of the fixed cylinder. An air inlet pipe and an exhaust pipe are connected to the outside of the air guiding device. One end of the air inlet pipe is connected to the fixed cylinder, and one end of the exhaust pipe is connected to the branch pipe.

[0029] A side hole is formed on the side wall of the valve core, and a return pipe is connected to the outer wall of the air guide tube. One end of the return pipe is connected to the branch pipe.

[0030] Furthermore, preferably, the air guiding device includes:

[0031] The air guide cylinder has multiple piston chambers arranged around its internal circumference. Each piston chamber is sealed and slidably connected to a plunger, and each piston chamber is provided with an air inlet and an air outlet.

[0032] A coupling plate is eccentrically rotatably connected inside the air guide cylinder. Multiple drive rods are hinged to the coupling plate, and the other end of each drive rod is connected to the plunger.

[0033] A connecting pipe is attached to each of the air inlets, and the other end of each connecting pipe is connected to the air inlet pipe.

[0034] The annular cavity is coaxially arranged inside the air guide cylinder, and all the exhaust ports are connected to the annular cavity, and the exhaust pipe is sealed to the annular cavity.

[0035] Furthermore, as a preferred embodiment, when the valve core is in sealed contact with the valve hole, the side hole is sealed and connected to the return pipe outside the air guide cylinder.

[0036] Furthermore, as a preferred embodiment, the upper end of the air guide tube is rotatably connected to a rotating shaft tube, a connecting tube is coaxially arranged inside the air guide tube, the upper end of the connecting tube is slidably connected to a fixed shaft, and the upper end of the fixed shaft is fixed to the rotating shaft tube; a positioning tube is fixed inside the air guide tube at the lower end of the connecting tube, and the air seal plate is assembled on the positioning tube.

[0037] An eccentric shaft is fixed to the outside of the connecting pipe, and a axial pressure ring is slidably arranged inside the air guide pipe. A compression spring is connected between the axial pressure ring and the air guide pipe.

[0038] The connecting pipe is fitted with a toothed pressure plate, and the positioning pipe is fitted with a top plate.

[0039] Furthermore, as a preferred embodiment, a plurality of masses are arranged axially inside the eccentric shaft, and each of the masses is radially slidably and sealed within the eccentric shaft, with a support spring connected to one end of each mass.

[0040] A connecting plug is fixed to the upper end of the connecting pipe, and the connecting plug is slidably connected to the fixed shaft.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] The movable frame used in this invention allows for easy displacement adjustment and flexible relocation to the transformer installation site (such as a substation or factory workshop) for in-situ testing. The main side-leakage unit performs a sealing test on the transformer tank, detecting any leaks. The pneumatic control device provides vacuum suction to remove residual gas interference from the tank and simultaneously injects high-pressure helium from a gas cylinder. The leak detection unit further applies vibration loading to the transmission, simulating the mechanical vibrations generated by electromagnetic forces and the cooling system during actual transformer operation. This dynamic leak detection method can detect "vibration-inspired" leaks or weld fatigue cracks that cannot be detected in static tests, making the test results closer to actual operating conditions and significantly improving reliability. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the side leakage unit in this invention;

[0045] Figure 3 This is a schematic diagram of the pneumatic control device in this invention;

[0046] Figure 4 This is a schematic diagram of the gas delivery unit in this invention;

[0047] Figure 5 This is a schematic diagram of the gas guiding device in this invention;

[0048] Figure 6 This is a schematic diagram of the internal structure of the air duct in this invention;

[0049] Figure 7 This is a schematic diagram of the structure of the mass block in this invention;

[0050] In the diagram: 1. Frame; 11. Power supply system; 12. Transformer; 13. Guide rail; 14. Oil seal pipe; 2. Side leakage unit; 21. Top plate; 22. Base plate; 23. Fixing bracket; 24. Threaded screw; 25. Positioning seat; 26. Gas seal plate; 27. Gas nozzle; 3. Gas control device; 31. Main pipe; 32. Mounting bracket; 33. Vacuum pump; 34. Gas cylinder one; 35. Gas cylinder two; 36. Diverter pipe; 37. Solenoid control valve one; 38. Solenoid control valve two; 4. Gas guide pipe; 41. 42. Rotating shaft tube; 43. Connecting pipe; 44. Fixed shaft; 45. Positioning tube; 46. Eccentric shaft; 47. Shaft pressure ring; 48. Gear pressure plate; 49. Mass block; 50. Connecting plug; 51. Gas delivery unit; 52. Fixed cylinder; 53. Air guide tube; 54. Valve core; 55. Air inlet pipe; 56. Exhaust pipe; 57. Side hole; 68. Return pipe; 69. Air guide device; 61. Air guide cylinder; 62. Piston chamber; 63. Air inlet; 64. Exhaust port; 65. Connecting shaft plate; 66. Connecting pipe; 67. Ring cavity. Detailed Implementation

[0051] Please see Figures 1-7 In this embodiment of the invention, an intelligent large transformer testing device includes:

[0052] Frame 1 has rollers installed at the lower ends of its four supporting legs for easy movement and flexible transport to the transformer installation site (such as substations or factory workshops) for in-situ testing;

[0053] The power supply system 11 is mounted on one side of the frame 1. A power cable is connected to the power supply system 11, and the other end of the power cable is electrically connected to the transformer 12. The power supply system 11 can provide the rated operating voltage and current to the transformer 12 under test, so that it can be tested for sealing performance under energized conditions and in a simulated real electromagnetic field and heating state.

[0054] The side leakage unit 2 is installed above the frame 1. Two guide rails 13 are symmetrically fixed on the frame 1. The side leakage unit 2 is slidably connected to each of the guide rails 13 through sliding blocks. The lower end of the side leakage unit 2 is sealed and connected to the oil seal pipe 14 of the transformer 12. In this device, the side leakage unit 2 can use gas to perform airtightness testing on the oil tank of the transformer 12. Compared with the water pressure test used in traditional testing equipment, where water is used as a medium and if it is not completely dried after the test, the residual moisture will seriously affect the insulation performance of the transformer oil and bring huge safety hazards. Therefore, the testing process of this device does not chemically react with the inner wall of the oil tank or the insulating oil to be injected in the future, and there is no pollution or residue.

[0055] The gas control device 3 is located on the other side of the frame 1, and the gas control device 3 is connected to the side leakage unit 2.

[0056] In this embodiment, the power supply system 11 is equipped with an overcurrent protector and an overvoltage protector, which can instantly cut off abnormal power supply and ensure that the transformer is protected from electrical damage in complex field environments.

[0057] In a preferred embodiment, the side leakage unit 2 includes:

[0058] The top plate 21 is horizontally slidably mounted on the guide rail 13, and the base plate 22 is fixed in parallel below the top plate 21 by a support rod.

[0059] A fixing frame 23 is vertically fixed to the upper end face of the base plate 22. A threaded screw 24 is rotatably connected to the fixing frame 23. The threaded screw 24 is driven to rotate in both directions by a motor outside the fixing frame 23.

[0060] The air guide tube 4 is vertically installed on one side of the fixed frame 23. The threaded screw 24 is slidably connected to the positioning seat 25 by the thread. The upper end of the air guide tube 4 is fixed to the positioning seat 25.

[0061] The air seal plate 26 is coaxially set at the lower end of the air guide pipe 4. The air seal plate 26 is sealed and fitted with the oil seal pipe 14. Therefore, before the test, the frame 1 is moved to the position of the transformer to be tested. At this time, the air guide pipe 4 is suspended and directly faces the oil seal pipe 14 of the transformer 12. The air guide pipe 4 is lowered as a whole by the threaded screw 24. The staff can then seal and assemble the air seal plate 26 with the oil seal pipe 14.

[0062] The air nozzle 27 is fixed to the lower end face of the air guide pipe 4, and the air nozzle 27 extends into the oil tank of the transformer 12.

[0063] In this embodiment, the pneumatic control device 3 includes:

[0064] The main pipe 31 is horizontally set on the frame 1, and one end of the main pipe 31 is connected to the side leakage unit 2 through the adapter pipe;

[0065] Mounting bracket 32 ​​is fixed on frame 1. A vacuum pump 33 is installed inside frame 1. The vacuum pump 33 is sealed and connected to the other end of main pipe 31. Before testing, the vacuum pump 33 can use main pipe 31 to discharge residual gas in transformer 12 oil tank to avoid gas interference.

[0066] Gas cylinder 1 34 and gas cylinder 2 35 are vertically fixed on the frame and located on one side of the mounting bracket 32. The delivery ports of gas cylinder 1 34 and gas cylinder 2 35 are connected to the diversion pipe 36.

[0067] The gas delivery unit 5 is fixed on one side of the mounting bracket 32. The other end of each of the branch pipes 36 is connected to the gas delivery unit 5. A branch pipe is connected to the outside of the gas delivery unit 5, and the other end of the branch pipe is connected to the main pipe.

[0068] Electromagnetic control valve 37 is installed on the main pipe 31. Electromagnetic control valve 38 is connected between the branch pipe and the main pipe 31. The working states of electromagnetic control valve 37 and electromagnetic control valve 38 are completely opposite, that is, when one is open, the other is closed. In this way, during the test, electromagnetic control valve 37 is opened first. At this time, vacuum pump 33 is sealed and connected to the oil tank of transformer 12. After vacuuming, electromagnetic control valve 38 is opened. Electromagnetic control valve 38 delivers the gas from gas cylinder 34 or gas cylinder 35 to the oil tank for airtightness testing.

[0069] In this embodiment, gas cylinder 34 stores high-pressure helium, and gas cylinder 35 stores fluorescent tracer gas. First, the high-pressure helium in gas cylinder 34 is used to perform a high-pressure sealing test on the fuel tank. Taking advantage of the small size and strong permeability of helium molecules, the leakage channel is quickly "activated" under high pressure so that the leak point can be revealed. Then, the fluorescent tracer gas in gas cylinder 35 is used for gas replenishment. The fluorescent tracer gas can be discharged through the leak point in the fuel tank. At this time, using an external detector such as an ultraviolet lamp, the location of the leak point emitting fluorescence can be captured instantly and intuitively, achieving "rapid visual positioning".

[0070] In this embodiment, the gas delivery unit 5 includes:

[0071] A fixed cylinder 51 has an air guide tube 52 fixed inside its center;

[0072] The valve core 53 is slidably connected inside the air guide cylinder 52. The air guide cylinder 52 is provided with a valve hole, and one end of the valve core 53 is slidably sealed to the valve hole.

[0073] An internal telescopic device (not shown in the figure) is installed inside the fixed cylinder 51. The telescopic end of the internal telescopic device is connected to the valve core 53 so that the internal telescopic device can adjust the axial displacement of the valve core 53 during telescopic operation.

[0074] An air guiding device 6 is installed at one end of the fixed cylinder 51. An air inlet pipe 54 and an exhaust pipe 55 are connected to the outside of the air guiding device 6. One end of the air inlet pipe 54 is connected to the fixed cylinder 51, and one end of the exhaust pipe 55 is connected to the branch pipe.

[0075] A side hole 56 is provided on the side wall of the valve core 53. A return pipe 57 is connected to the outer wall of the air guide cylinder 52. One end of the return pipe 57 is connected to the branch pipe. That is to say, when the valve core 53 is disengaged from the valve hole, each branch pipe 36 can be connected to the branch pipe, and the gas in gas cylinder 1 34 and gas cylinder 2 35 enters the oil tank through the branch pipe; when the valve core 53 is sealed with the valve hole, the side hole 56 is connected to the return pipe 57, and the air guide device 6 can be used to perform reciprocating suction and mixing of the gas filled in the oil tank.

[0076] In a preferred embodiment, the air guiding device 6 includes:

[0077] The air guide cylinder 61 has multiple piston chambers 62 arranged around its internal circumference. Each piston chamber 62 is sealed and slidably connected with a plunger, and each piston chamber 62 is respectively provided with an air inlet 63 and an exhaust port 64.

[0078] The connecting plate 65 is eccentrically rotatably connected to the air guide cylinder 61. Multiple drive rods are hinged on the connecting plate 65, and the other end of each drive rod is connected to the plunger. In this way, when the connecting plate 65 rotates eccentrically, the plungers in each piston chamber 62 can slide axially to perform gas suction or discharge.

[0079] A connecting pipe 66 is connected to each of the air inlets 63, and the other end of the connecting pipe 66 is connected to the air inlet pipe 54.

[0080] The annular cavity 67 is coaxially arranged in the air guide cylinder 61. The exhaust ports 64 are all connected to the annular cavity 67, and the exhaust pipe 55 is sealed to the annular cavity 67. The air inlet 63 and the exhaust port 64 are both one-way hole structures so that the gas can enter each piston cavity 62 through the air inlet 63 and then be discharged through the exhaust port 64.

[0081] In this embodiment, when the valve core 52 is in sealed contact with the valve hole, the side hole 56 is sealed and connected to the return pipe 57 outside the gas guide cylinder 52. Specifically, during the leak detection process, the built-in telescopic device first controls the valve core 53 to disengage from the valve hole, so that each branch pipe 36 can be connected to the branch pipe. Then, helium gas is supplied to the oil tank using gas cylinder 34, so that the gas in the oil tank tends to be saturated. During the second process, the piston plate 65 rotates and uses the plunger in the piston chamber 62 to inject high-pressure gas into the oil tank. After maintaining this for a period of time, fluorescent tracer gas from gas cylinder 35 is used for replenishment. Then, the built-in telescopic device controls the valve core 53 to seal and cooperate with the valve hole, and the side hole 56... When the return pipe 57 is sealed and connected, the piston chambers 62 of the coupling plate 65 can use the plunger to collect the gas through the return pipe 57 and then send it back to the branch pipe during rotation, so that the gas in the tank is fully mixed. This ensures that the fluorescent tracer gas can flow fully and form a forced internal gas circulation. This ensures that the composition and concentration of the gas escaping from any leak point are highly consistent with the overall concentration inside the tank. In this way, even if the leak point is very hidden or located in an area where the gas is not easy to naturally convect, the tracer gas is forced to be delivered to the area, and its escaping concentration is sufficient to be captured by the ultraviolet lamp, avoiding missed detection due to the gas not reaching the area.

[0082] In this embodiment, the upper end of the air guide tube 4 is rotatably connected to a rotating shaft tube 41. The rotating shaft tube 41 is rotated by an externally installed motor through gear meshing. A connecting tube 42 is coaxially arranged inside the air guide tube 4. A fixed shaft 43 is slidably connected to the upper end of the connecting tube 42. The upper end of the fixed shaft 43 is fixed to the rotating shaft tube 41. A positioning tube 44 is fixed inside the air guide tube 4 at the lower end of the connecting tube 42. The air seal plate 26 is assembled on the positioning tube 44.

[0083] An eccentric shaft 45 is fixed to the outside of the connecting pipe 42, and a slidable axial pressure ring 46 is provided inside the air guide pipe 4. A compression spring is connected between the axial pressure ring 46 and the air guide pipe 4, which can use the elastic force to push the axial pressure ring 46 downward.

[0084] The connecting pipe 42 is fitted with a toothed pressure plate 47, and the positioning pipe 44 is fitted with a top plate. In other words, during vibration simulation, the rotating shaft pipe 41 rotates continuously, and the eccentric shaft 45 generates eccentric vibration. At the same time, when the toothed pressure plate 47 contacts the top plate, it can also achieve axial vibration by alternating meshing of tooth peaks and tooth grooves, thereby transmitting the vibration to the entire transmission oil tank and achieving vibration loading.

[0085] Multiple blocks 48 are axially arranged inside the eccentric shaft 45, and each block 48 is radially slidably and sealingly connected inside the eccentric shaft 45. One end of each block 48 is connected to a support spring. It should be noted that a bypass hole corresponding to the block 48 is opened on the side wall of the connecting pipe 42. In this case, the greater the air pressure in the connecting pipe 42, the more the block 48 inside the eccentric shaft 45 can slide under the pressure of the air pressure and gradually move away from the center of the connecting pipe 42. At this time, the centrifugal force generated during its rotation is greater, and the support spring is gradually compressed. Therefore, during the air injection leak test, as the air injection pressure increases, the centrifugal force provided by the eccentric shaft 45 increases, the vibration loading is stronger, and the adequacy of the exposure of leak defects in the oil tank is significantly improved.

[0086] The upper end of the connecting pipe 42 is fixed with a connecting plug 49, which is slidably connected to the fixed shaft 43. The connecting plug 49 can slide the connecting pipe 42 axially downward under the push of air pressure, further increasing the contact pressure between the tooth pressure plate 47 and the top plate, resulting in greater axial vibration intensity. The impact energy generated when the tooth peaks and tooth grooves alternately mesh and separate is greater, and the axial vibration intensity transmitted to the oil tank is also enhanced.

[0087] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An intelligent large transformer testing device, characterized in that, It includes: The frame (1) has rollers installed at the lower ends of its four supporting legs; A power supply system (11) is mounted on one side of the frame (1), and a power cable is connected to the power supply system (11), the other end of which is electrically connected to the transformer (12). A side leakage unit (2) is installed above a frame (1). Two guide rails (13) are symmetrically fixed on the frame (1). The side leakage unit (2) slides and is slidably connected to each of the guide rails (13) through a sliding block. The lower end of the side leakage unit (2) is sealed and connected to the oil seal pipe (14) of the transformer (12). A gas control device (3) is set on the other side of the frame (1), and the gas control device (3) is connected to the side leakage unit (2).

2. The intelligent large transformer testing device according to claim 1, characterized in that: The power supply system (11) is equipped with an overcurrent protector and an overvoltage protector.

3. The intelligent large transformer testing device according to claim 1, characterized in that, The side leakage unit (2) includes: The top plate (21) is horizontally slidably mounted on the guide rail (13), and a base plate (22) is fixed parallel to the bottom of the top plate (21) by a support rod. A fixing frame (23) is vertically fixed on the upper surface of the substrate (22), and a threaded screw (24) is rotatably connected to the fixing frame (23). The air guide tube (4) is vertically installed on one side of the fixed frame (23). The threaded screw (24) is slidably connected to the positioning seat (25) by the thread. The upper end of the air guide tube (4) is fixed to the positioning seat (25). An air seal plate (26) is coaxially disposed at the lower end of the air guide pipe (4), and the air seal plate (26) is sealed to the oil seal pipe (14); An air nozzle (27) is fixed to the lower end face of the air duct (4) and extends into the oil tank of the transformer (12).

4. The intelligent large transformer testing device according to claim 1, characterized in that, The pneumatic control device (3) includes: The main pipe (31) is horizontally set on the frame (1), and one end of the main pipe (31) is connected to the side leakage unit (2) through the adapter pipe; Mounting bracket (32) is fixed on frame (1), and a vacuum pump (33) is installed inside the frame (1). The vacuum pump (33) is sealed and connected to the other end of the main pipe (31). Gas cylinder one (34) and gas cylinder two (35) are vertically fixed on the frame and located on one side of the mounting bracket (32). The delivery ports of gas cylinder one (34) and gas cylinder two (35) are connected to a diversion pipe (36). The gas delivery unit (5) is fixed on one side of the mounting bracket (32), and the other end of each of the branch pipes (36) is connected to the gas delivery unit (5). The gas delivery unit (5) is connected to a branch pipe, and the other end of the branch pipe is connected to the main pipe. Electromagnetic control valve one (37) is installed on the main pipe (31), and electromagnetic control valve two (38) is connected between the branch pipe and the main pipe (31).

5. The intelligent large transformer testing device according to claim 4, characterized in that: The first gas cylinder (34) contains high-pressure helium, and the second gas cylinder (35) contains fluorescent tracer gas.

6. The intelligent large transformer testing device according to claim 4, characterized in that, The gas delivery unit (5) includes: A fixed cylinder (51) has an air guide tube (52) fixed in its center; The valve core (53) is slidably connected inside the air guide cylinder (52), and the air guide cylinder (52) is provided with a valve hole. One end of the valve core (53) is slidably sealed with the valve hole. An internal telescopic device is installed inside a fixed cylinder (51), and the telescopic end of the internal telescopic device is connected to the valve core (53); An air guiding device (6) is installed at one end of the fixed cylinder (51). An air inlet pipe (54) and an exhaust pipe (55) are connected to the air guiding device (6). One end of the air inlet pipe (54) is connected to the fixed cylinder (51), and one end of the exhaust pipe (55) is connected to the branch pipe. A side hole (56) is provided on the side wall of the valve core (53). A return pipe (57) is connected to the outer wall of the air guide cylinder (52). One end of the return pipe (57) is connected to the branch pipe.

7. The intelligent large transformer testing device according to claim 6, characterized in that, The air guiding device (6) includes: The air guide cylinder (61) has multiple piston chambers (62) arranged around its inner circumference. Each piston chamber (62) is sealed and slidably connected with a plunger, and each piston chamber (62) is provided with an air inlet (63) and an air outlet (64). A connecting plate (65) is eccentrically rotatably connected inside the air guide cylinder (61). Multiple drive rods are hinged on the connecting plate (65), and the other end of each drive rod is connected to the plunger. Connecting pipe (66) is connected to each of the air inlets (63), and the other end of each connecting pipe (66) is connected to the air inlet pipe (54); The annular cavity (67) is coaxially arranged in the air guide cylinder (61), and the exhaust ports (64) are all connected to the annular cavity (67), and the exhaust pipe (55) is sealed and connected to the annular cavity (67).

8. The intelligent large transformer testing device according to claim 6, characterized in that: When the valve core (52) is in sealed contact with the valve hole, the side hole (56) is sealed and connected to the return pipe (57) outside the air guide cylinder (52).

9. The intelligent large transformer testing device according to claim 2, characterized in that: The upper end of the air guide tube (4) is rotatably connected to a rotating shaft tube (41), and a connecting tube (42) is coaxially arranged inside the air guide tube (4). The upper end of the connecting tube (42) is slidably connected to a fixed shaft (43), and the upper end of the fixed shaft (43) is fixed to the rotating shaft tube (41). A positioning tube (44) is fixed inside the air guide tube (4) at the lower end of the connecting tube (42), and the air seal plate (26) is assembled on the positioning tube (44). An eccentric shaft (45) is fixed to the outside of the connecting pipe (42), and a slidable axial pressure ring (46) is provided inside the air guide pipe (4). A compression spring is connected between the axial pressure ring (46) and the air guide pipe (4). The connecting pipe (42) is fitted with a toothed pressure plate (47), and the positioning pipe (44) is fitted with a top plate.

10. The intelligent large transformer testing device according to claim 9, characterized in that: Multiple blocks (48) are arranged axially inside the eccentric shaft (45), and each block (48) is radially slidably sealed inside the eccentric shaft (45). One end of each block (48) is connected to a support spring. The upper end of the connecting pipe (42) is fixed with a connecting plug (49), which is slidably connected to the fixed shaft (43).

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