Oil-immersed transformer and control method thereof

Abstract

The invention discloses an oil-immersed transformer and a control method thereof, and relates to the field of transformer windings, the oil-immersed transformer comprises a shell, a bottom plate arranged at the bottom of the shell, a top cover arranged at the top of the shell, a load insulator and a power supply insulator, the load insulator and the power supply insulator are arranged on the top cover, the load insulator is connected with an output load, and the power supply insulator is connected with the output load. The power supply insulator is connected with an access power supply, the transformer unit is arranged in the shell and is used for increasing or reducing input voltage, the oil control unit is used for controlling cooling oil in the shell, the air cooling unit is used for carrying out secondary cooling on the transformer unit of the cooling oil box, and when the transformer unit is externally connected with the power supply, the transformer unit can control the voltage to be increased or reduced. The oil control mechanism can replace cooling oil in the shell regularly, and meanwhile the air cooling unit can cool the transformation unit and the cooling oil.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer windings, and in particular to an oil-immersed transformer and a control method thereof. Background Art

[0002] An oil-immersed transformer is a type of electrical equipment that relies on transformer oil for insulation and cooling. Its core consists of an iron core made of laminated silicon steel sheets and primary and secondary windings wound around the core, all housed in a sealed oil tank. During operation, alternating current is applied to the primary coil, generating an alternating magnetic field in the iron core. This voltage is generated in the secondary coil through electromagnetic induction. The transformer oil both isolates the potential difference between the windings and the iron core and conducts heat generated during operation to the oil tank and radiator through convection, achieving cooling. Its advantages include strong insulation, high cooling efficiency, and low cost, making it widely used in power grid transmission, industrial power distribution, and other applications. However, caution is advised regarding the flammability of the oil and the need for regular oil quality maintenance.

[0003] During the operation of the transformer, the distance between the coils in the winding may change due to mechanical stress such as transportation vibration, electromagnetic force impact during short circuit, and thermal expansion and contraction caused by heating of the winding during operation. Long-term operation may cause insulation aging or mechanical failure. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention solves the technical problems thereof by adopting the following technical solutions: an oil-immersed transformer according to the present invention comprises a housing, a bottom plate arranged at the bottom of the housing, a top cover arranged at the top of the housing, and a load insulator and a power insulator, wherein the load insulator and the power insulator are arranged on the top cover, the load insulator is connected to the output load, and the power insulator is connected to the input power supply, and further comprises:

[0005] A transformer unit provided in the housing and configured to step up or down the input voltage, an oil control unit configured to control the cooling oil in the housing, and an air cooling unit configured to perform secondary cooling on the cooling oil box transformer unit;

[0006] The transformer unit includes a top plate, a placement frame is provided at the bottom of the top plate, an iron core composed of thin insulating silicon steel sheets is provided on both sides of the placement frame, a primary coil plate is sleeved on the iron core, and secondary mechanisms are also provided on both sides of the placement frame, a semicircular notch is provided on the outer side of the primary coil plate, a control mechanism is provided in the middle of the placement frame, and the secondary mechanism is adjusted by a position control mechanism;

[0007] The secondary mechanism includes a side plate, the outer surface of the side plate is fixedly connected to a guide column, the outer surface of the guide column is evenly provided with moving blocks, the outer surface of the moving block is fixedly connected to a clamping plate 1, the clamping plate 1 is provided with a coil plate, the coil plate is wound with a secondary coil, and the inner side of the secondary coil is provided with a semicircular notch 2 that matches the semicircular notch 1.

[0008] Preferably, the top of the top plate is fixedly connected to the inner wall of the outer shell, and the two ends of the side plates are fixedly connected to the outer surface of the placement rack.

[0009] Preferably, the primary coil plate is connected to the power insulator, the secondary coil is connected to the load insulator, and the secondary coil wraps the primary coil plate.

[0010] Preferably, the inner wall of the moving block is slidably connected to the outer surface of the guide column, and the friction between the moving block and the guide column is relatively large, and the moving block remains motionless if no external force is applied.

[0011] Preferably, the positioning mechanism includes a servo motor 1, the output end of the servo motor 1 is fixedly connected to a reciprocating screw, the outer surface of the reciprocating screw is threadedly connected to a moving platform, telescopic rod 1 is symmetrically arranged on both sides of the moving platform, the output end of the telescopic rod 1 is fixedly connected to a clamping plate 2, the opening size of the clamping plate 2 is adapted to the thickness of the secondary coil, a temperature monitor is provided on the top of the moving platform, a monitoring plate is provided on the top of the clamping plate 2, and the monitoring plate is connected to the temperature monitor through a wire.

[0012] Preferably, the bottom of the servo motor 1 is fixedly connected to the bottom of the placement rack, and the monitoring board is in contact with the secondary coil and monitors its surface temperature in real time.

[0013] Preferably, the air cooling unit includes an air inlet end, an outer surface of the air inlet end is fixedly connected to an air extractor, both ends of the air inlet end are fixedly connected to a ventilation plate 1, a cooling pipe is provided at the bottom of the ventilation plate 1, a ventilation plate 1 is also provided at the bottom of the cooling pipe, the outer surface of the ventilation plate 1 at the bottom is fixedly connected to the air outlet end, an embedded mechanism is provided on the outer surface of the air outlet end, and the air extractor is connected to the ventilation plate 1 at the top through an air pipe;

[0014] The height of the air inlet end is located above the cooling oil liquid level in the shell, and the air outlet end is located below the cooling oil liquid level.

[0015] Preferably, the embedded mechanism includes a second ventilation plate, a disc is provided at one end of the second ventilation plate, a vertical pipe is provided on the top of each disc, support rods are provided on both sides of the second ventilation plate, the top of the support rod is fixedly connected to the first support plate, the bottom of the first support plate is fixedly connected to the second telescopic rod, and the output end of the second telescopic rod is fixedly connected to a blocking block;

[0016] The vertical pipe is embedded between the semicircular notch 1 and the semicircular notch 2;

[0017] When the telescopic rod 2 is in the output state, the blocking block blocks the cooling gas from flowing through the ventilation plate 2.

[0018] Preferably, the outer surface of the air inlet end is fixedly connected to the top of the shell, and one end of the second vent plate is fixedly connected to the outer surface of the air outlet end.

[0019] Preferably, the oil control unit includes a second support plate, the top of the second support plate is fixedly connected to an oil tank, cooling oil is placed in the oil tank, a pumping machine is provided on one side of the oil tank, an oil inlet pipe and an oil outlet pipe are provided at the bottom of the pumping machine, the bottoms of the oil inlet pipe and the oil outlet pipe are located in the outer shell, a second servo motor is fixedly connected to the outer surface of the oil tank, an output end of the second servo motor is fixedly connected to a rotating shaft, an end of the rotating shaft close to the pumping machine is fixedly connected to a shoveling blade, support columns are provided on the shoveling blades, and gaps are provided between adjacent support columns.

[0020] A control method for an oil-immersed transformer comprises the following steps:

[0021] S1: Place a certain amount of cooling oil in the housing and the oil control unit in advance, and connect the power supply and load ends to the power insulator and load insulator;

[0022] S2: After the power is turned on, the voltage is increased or decreased through the transformer unit;

[0023] S3: The control mechanism will adjust the secondary mechanism according to the actual temperature of the winding;

[0024] S4: The oil control mechanism and the air cooling unit realize cooling of the transformer unit.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The present invention provides a primary coil plate and a secondary mechanism, and realizes winding of the winding by combining the coil and the coil plate. The position can be adjusted by a position control mechanism. This not only avoids the coil from being easily deformed by the electromagnetic force during the operation of the overall transformer, which may cause insulation aging or mechanical failure during long-term operation, but also enhances the overall winding cooling efficiency by providing a semicircular notch 1 and a semicircular notch 2 on the primary coil plate and the coil plate, respectively, and cooperating with the embedding mechanism.

[0027] 2. The present invention sets a position control mechanism. When the position of the coil plate changes due to the action of electromagnetic force, the servo motor controls the reciprocating screw to rotate, thereby moving the mobile platform to the changed position of the coil plate. Then the telescopic rod extends and drives the clamping plate 2 to fit the coil plate. Then the servo motor drives the reciprocating screw to rotate and causes the mobile platform to move again and control the coil plate to return to its original position.

[0028] 3. The present invention provides a position control mechanism, which also implements the working process of the above-mentioned beneficial effect 2. It controls the upper and lower coil plates adjacent to the coil plate with higher temperature to increase the distance therefrom for a short period of time, thereby widening the oil flow channel and reducing thermal resistance. After the temperature drops, the connected coil plates are reset.

[0029] 4. The present invention provides an air cooling unit. When the temperature monitor detects that the temperature of the entire winding is very high, the telescopic rod 2 will retract upward, so that the barrier block does not hinder the movement of the cooling gas, and the cooling gas moves to the riser, thereby specifically lowering the temperature of the entire winding.

[0030] 5. The present invention sets an oil control unit, and the servo motor 2 drives the rotating shaft and the shoveling blades to rotate, thereby increasing the oil circulation in the oil tank. At the same time, the oil passes through the gaps between the support columns, and the friction force increases the temperature of the cooling oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the transformer unit of the present invention.

[0034] Figure 4 It is a partial structural diagram of the transformer unit of the present invention.

[0035] Figure 5 It is a structural diagram of the secondary mechanism of the present invention.

[0036] Figure 6 It is a structural schematic diagram of the position control mechanism of the present invention.

[0037] Figure 7 It is a structural schematic diagram of the air cooling unit of the present invention.

[0038] Figure 8 It is a structural schematic diagram of the embedding mechanism of the present invention.

[0039] Figure 9 It is a structural schematic diagram of the oil control unit of the present invention.

[0040] Figure 10 Schematic diagram of the internal structure of the oil control unit of the present invention.

[0041] Figure 11 It is a block diagram of the control method of the present invention.

[0042] In the figure: 1. housing; 2. bottom plate; 3. transformer unit; 4. top cover; 5. load insulator; 6. power insulator; 7. air cooling unit; 8. oil control unit; 31. top plate; 32. placement rack; 33. iron core; 34. primary coil plate; 35. secondary mechanism; 36. semicircular notch 1; 37. position control mechanism; 351. side plate; 352. guide column; 353. moving block; 354. clamping plate 1; 355. coil plate; 356. semicircular notch 2; 357. secondary coil; 371. servo motor 1; 372. reciprocating screw; 373. moving platform; 374. telescopic rod 1; 3 75. Clamping plate 2; 376. Temperature monitor; 377. Wire; 378. Monitoring plate; 71. Air inlet; 72. Vacuum pump; 73. Ventilation plate 1; 74. Air pipe; 75. Cooling pipe; 76. Air outlet; 77. Embedded mechanism; 771. Ventilation plate 2; 772. Disc; 773. Vertical pipe; 774. Support plate 1; 775. Support rod; 776. Telescopic rod 2; 777. Blocking block; 81. Support plate 2; 82. Oil tank; 83. Liquid pump; 84. Oil inlet pipe; 85. Oil outlet pipe; 86. Servo motor 2; 87. Rotating shaft; 88. Shoveling blade; 89. Support column. DETAILED DESCRIPTION

[0043] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0044] Example 1: Use Figures 1-11 An oil-immersed transformer and a control method thereof according to an embodiment of the present invention are described below.

[0045] like Figure 1-Figure 2 As shown, an oil-immersed transformer of the present invention includes a housing 1, a base plate 2 arranged at the bottom of the housing 1, a top cover 4 arranged at the top of the housing 1, and a load insulator 5 and a power insulator 6. The load insulator 5 and the power insulator 6 are arranged on the top cover 4. The load insulator 5 is connected to the output load, and the power insulator 6 is connected to the input power supply. The transformer also includes:

[0046] A transformer unit 3 provided in the housing 1 for stepping up or down the input voltage, an oil control unit 8 for controlling the cooling oil in the housing 1, and an air cooling unit 7 for secondary cooling the cooling oil box transformer unit 3;

[0047] When the present invention is working, after the external power supply is connected, the transformer unit 3 will control the increase or decrease of the voltage, the oil control mechanism will regularly replace the cooling oil in the shell 1, and the air cooling unit 7 will cool the transformer unit 3 and the cooling oil.

[0048] like Figure 3-Figure 4 The transformer unit 3 includes a top plate 31, a placement frame 32 is provided at the bottom of the top plate 31, and an iron core 33 composed of thin insulating silicon steel sheets is provided on both sides of the placement frame 32. A primary coil plate 34 is sleeved on the iron core 33. Secondary mechanisms 35 are also provided on both sides of the placement frame 32. A semicircular notch 36 is provided on the outer side of the primary coil plate 34. A control mechanism is provided in the middle of the placement frame 32, and the secondary mechanism 35 is adjusted by a position control mechanism 37.

[0049] like Figure 5 As shown, the secondary mechanism 35 includes a side plate 351, the outer surface of the side plate 351 is fixedly connected to a guide column 352, the outer surface of the guide column 352 is evenly provided with moving blocks 353, the outer surface of the moving block 353 is fixedly connected to a clamping plate 1 354, the clamping plate 1 354 is provided with a coil plate 355, the coil plate 355 is wound with a secondary coil 357, and the inner side of the secondary coil 357 is provided with a semicircular notch 2 356 that matches the semicircular notch 1 36.

[0050] By combining the coil and the coil plate 355, the winding of the winding is achieved, and the position can be adjusted by the position control mechanism. This not only avoids the coil from being easily deformed by the electromagnetic force during the operation of the overall transformer, which may cause insulation aging or mechanical failure during long-term operation, but also enhances the overall winding cooling efficiency by arranging semicircular notch 1 36 and semicircular notch 2 356 on the primary coil plate 34 and the coil plate 355 respectively, and cooperating with the embedding mechanism 77.

[0051] The top of the top plate 31 is fixedly connected to the inner wall of the outer shell 1 , and both ends of the side plates 351 are fixedly connected to the outer surface of the placement rack 32 .

[0052] The primary coil plate 34 is connected to the power insulator 6 , and the secondary coil 357 is connected to the load insulator 5 . The secondary coil 357 wraps around the primary coil plate 34 .

[0053] The inner wall of the moving block 353 is slidably connected to the outer surface of the guide post 352. The friction between the moving block 353 and the guide post 352 is relatively large, and the moving block 353 will remain motionless unless external force is applied.

[0054] like Figure 6As shown, the positioning mechanism 37 includes a servo motor 371, the output end of the servo motor 371 is fixedly connected to a reciprocating screw 372, the outer surface of the reciprocating screw 372 is threadedly connected to a moving platform 373, telescopic rods 374 are symmetrically arranged on both sides of the moving platform 373, the output end of the telescopic rod 374 is fixedly connected to a clamping plate 2 375, the opening size of the clamping plate 2 375 is adapted to the thickness of the secondary coil 357, a temperature monitor 376 is provided on the top of the moving platform 373, and a monitoring plate 378 is provided on the top of the clamping plate 2 375, and the monitoring plate 378 is connected to the temperature monitor 376 via a wire 377.

[0055] When the position of the coil plate 355 changes due to the action of electromagnetic force, the servo motor 1 371 will control the reciprocating screw 372 to rotate, so that the movable platform 373 moves to the changed position of the coil plate 355, and then the telescopic rod 1 374 will extend and drive the clamping plate 2 375 to fit with the coil plate 355, and then the servo motor 1 371 will drive the reciprocating screw 372 to rotate and make the movable platform 373 move again and control the coil plate 355 to return to its original position.

[0056] At the same time, since the secondary winding is connected to a high voltage, the temperature at the secondary winding will be higher, and the telescopic rod 374 and the servo motor 371 will also work together regularly, so that the monitoring plate 378 is attached to each coil plate 355 in turn and detects the temperature of the coil plate 355. When the temperature of a certain coil plate 355 is significantly different from the temperature of other coil plates 355, the control mechanism will also implement the above-mentioned working process, and control the distance between the upper and lower coil plates 355 adjacent to the coil plate 355 with the higher temperature to increase for a short time, thereby widening the oil flow channel and reducing the thermal resistance. After the temperature drops, the connected coil plates 355 are reset.

[0057] The bottom of the servo motor 371 is fixedly connected to the bottom of the placement rack 32, and the monitoring board 378 is in contact with the secondary coil 357 and monitors its surface temperature in real time.

[0058] The specific workflow is as follows:

[0059] Under normal circumstances, the transformer unit 3 will control the voltage to increase or decrease. When the voltage increases, the coil plate 355 in the winding changes position due to the action of electromagnetic force, and the servo motor 1 371 will control the reciprocating screw 372 to rotate, so that the movable platform 373 moves to the changed position of the coil plate 355. Then the telescopic rod 1 374 will extend and drive the clamping plate 2 375 to fit with the coil plate 355. Then the servo motor 1 371 will drive the reciprocating screw 372 to rotate and make the movable platform 373 move again and control the coil plate 355 to return to its original position. At the same time, when the temperature of a certain coil plate 355 is significantly different from that of other coil plates 355, the position control mechanism 37 will also adjust the coil plate 355, and control the upper and lower coil plates 355 adjacent to the coil plate 355 with higher temperature to increase the distance between it and the coil plate 355 for a short time, thereby widening the oil circulation channel and reducing thermal resistance. After its temperature drops, the connected coil plates 355 are reset.

[0060] Example 2: Use Figures 1-11 An oil-immersed transformer and a control method thereof according to an embodiment of the present invention are described below.

[0061] like Figure 7 As shown, an oil-immersed transformer and control method thereof of the present invention, based on the first embodiment, comprises an air cooling unit 7 including an air inlet end 71, an air extractor 72 fixedly connected to the outer surface of the air inlet end 71, a vent plate 73 fixedly connected to both ends of the air inlet end 71, a cooling pipe 75 provided at the bottom of the vent plate 73, a vent plate 73 also provided at the bottom of the cooling pipe 75, an outer surface of the vent plate 73 located at the bottom is fixedly connected to an air outlet end 76, an outer surface of the air outlet end 76 is provided with an embedding mechanism 77, and the air extractor 72 is connected to the vent plate 73 located at the top via an air pipe 74;

[0062] The air inlet end 71 is located above the cooling oil level in the housing 1 , and the air outlet end 76 is located below the cooling oil level.

[0063] There will also be air in the shell 1, which will absorb the heat generated by the transformer unit 3 on the liquid surface. At the same time, the vacuum fan 72 will extract hot air through the air inlet end 71 and reduce the temperature through the cooling pipe 75, and finally spray it into the cooling oil through the air outlet end 76, which will also reduce the temperature of the cooling oil.

[0064] like Figure 8 As shown, the embedding mechanism 77 includes a second ventilation plate 771, a disc 772 is provided at one end of the second ventilation plate 771, and a standpipe 773 is provided on the top of each disc 772. Support rods 775 are provided on both sides of the second ventilation plate 771, and the top of the support rod 775 is fixedly connected to the first support plate 774. The bottom of the first support plate 774 is fixedly connected to the second telescopic rod 776. The output end of the telescopic rod 776 is fixedly connected to a blocking block 777.

[0065] The riser 773 is embedded between the semicircular notch 1 36 and the semicircular notch 2 356;

[0066] When the telescopic rod 2 776 is in the output state, the blocking block 777 blocks the circulation of the cooling gas in the ventilation plate 2 771 .

[0067] When the temperature monitor 376 detects that the temperature of the entire winding is very high, the telescopic rod 2 776 will shrink upward, so that the blocking block 777 does not hinder the movement of the cooling gas, allowing the cooling gas to move to the riser 773, thereby specifically lowering the temperature of the entire winding.

[0068] The outer surface of the air inlet end 71 is fixedly connected to the top of the housing 1 , and one end of the second vent plate 771 is fixedly connected to the outer surface of the air outlet end 76 .

[0069] like Figure 9-10 As shown, the oil control unit 8 includes a support plate 81, the top of the support plate 81 is fixedly connected to an oil tank 82, cooling oil is placed in the oil tank 82, a pumping machine 83 is provided on one side of the oil tank 82, and an oil inlet pipe 84 and an oil outlet pipe 85 are provided at the bottom of the pumping machine 83, the bottoms of the oil inlet pipe 84 and the oil outlet pipe 85 are located in the outer shell 1, and a servo motor 86 is fixedly connected to the outer surface of the oil tank 82, and the output end of the servo motor 86 is fixedly connected to a rotating shaft 87, and the end of the rotating shaft 87 close to the pumping machine 83 is fixedly connected to a shoveling blade 88, and the shoveling blade 88 is provided with a support column 89, and a gap is provided between adjacent support columns 89.

[0070] A certain amount of cooling oil will be stored in the oil tank 82, and the circulation and replacement of the oil tank 82 in the outer shell 1 will be achieved through the pumping machine 83. Since metal debris, dust, and sludge (a colloidal substance produced by oil oxidation) may accumulate in the oil tank 82 due to long-term use, especially when the oil temperature is too low, the viscosity of the hydraulic oil or lubricating oil increases (such as when the equipment is started in winter), the flow resistance increases significantly, which will hinder the circulation of the cooling oil. Therefore, the servo motor 2 86 will drive the rotating shaft 87 and the shoveling blade 88 to rotate, increasing the oil circulation in the oil tank 82. At the same time, the oil will pass through the gap between the support columns 89, and the friction will increase the temperature of the cooling oil.

[0071] The specific workflow is as follows:

[0072] During operation, the vacuum pump 72 will draw hot air through the air inlet end 71 and reduce the temperature through the cooling pipe 75, and finally spray it into the cooling oil through the air outlet end 76, which will also reduce the temperature of the cooling oil. At the same time, by setting the embedded mechanism 77, when the temperature monitor 376 detects that the temperature of the entire winding is very high, the telescopic rod 2 776 will shrink upward, so that the blocking block 777 does not hinder the movement of the cooling gas, and the cooling gas moves to the riser 773, specifically reducing the temperature of the entire winding. At the same time, when the oil control unit 8 replaces the cooling oil, the servo motor 2 86 will drive the rotating shaft 87 and the shoveling blade 88 to rotate, increasing the oil circulation in the oil tank 82, and the oil will pass through the gap between the support columns 89, and the friction will increase the temperature of the cooling oil.

[0073] like Figure 11 As shown, a control method for an oil-immersed transformer includes the following steps:

[0074] S1: Place a certain amount of cooling oil in the housing 1 and the oil control unit 8 in advance, and connect the power supply and load terminals to the power insulator 6 and the load insulator 5;

[0075] S2: After the power is turned on, the voltage is increased or decreased through the transformer unit 3;

[0076] S3: The position control mechanism 37 adjusts the secondary mechanism 35 according to the actual temperature of the winding;

[0077] S4: The oil control mechanism and the air cooling unit 7 cool down the transformer unit 3 .

[0078] Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative work should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. An oil-immersed transformer comprising a housing, a base plate disposed at the bottom of the housing, a top cover disposed at the top of the housing, and load insulators and power insulators, wherein the load insulators and power insulators are disposed on the top cover, the load insulators being connected to an output load, and the power insulators being connected to an input power supply, characterized in that: Also includes: A transformer unit provided in the housing and configured to step up or down the input voltage, an oil control unit configured to control the cooling oil in the housing, and an air cooling unit configured to perform secondary cooling on the cooling oil box transformer unit; The transformer unit includes a top plate, a placement frame is provided at the bottom of the top plate, an iron core composed of thin insulating silicon steel sheets is provided on both sides of the placement frame, a primary coil plate is sleeved on the iron core, and secondary mechanisms are also provided on both sides of the placement frame, a semicircular notch is provided on the outer side of the primary coil plate, a control mechanism is provided in the middle of the placement frame, and the secondary mechanism is adjusted by a position control mechanism; The secondary mechanism includes a side plate, the outer surface of the side plate is fixedly connected to a guide column, the outer surface of the guide column is evenly provided with moving blocks, the outer surface of the moving block is fixedly connected to a clamping plate 1, the clamping plate 1 is provided with a coil plate, the coil plate is wound with a secondary coil, and the inner side of the secondary coil is provided with a semicircular notch 2 that matches the semicircular notch 1.

2. The oil-immersed transformer according to claim 1, characterized in that: The top of the top plate is fixedly connected to the inner wall of the shell, and the two ends of the side plates are fixedly connected to the outer surface of the placement rack.

3. The oil-immersed transformer according to claim 1, characterized in that: The primary coil plate is connected to a power insulator, the secondary coil is connected to a load insulator, and the secondary coil wraps the primary coil plate.

4. The oil-immersed transformer according to claim 1, characterized in that: The inner wall of the moving block is slidably connected to the outer surface of the guide column. The friction between the moving block and the guide column is relatively large, and the moving block remains motionless unless external force is applied.

5. The oil-immersed transformer according to claim 1, characterized in that: The positioning mechanism includes a servo motor 1, the output end of the servo motor 1 is fixedly connected to a reciprocating screw, the outer surface of the reciprocating screw is threadedly connected to a mobile platform, telescopic rod 1 is symmetrically arranged on both sides of the mobile platform, the output end of the telescopic rod 1 is fixedly connected to a clamping plate 2, the opening size of the clamping plate 2 is adapted to the thickness of the secondary coil, a temperature monitor is provided on the top of the mobile platform, a monitoring plate is provided on the top of the clamping plate 2, and the monitoring plate is connected to the temperature monitor through a wire.

6. The oil-immersed transformer according to claim 5, characterized in that: The bottom of the servo motor 1 is fixedly connected to the bottom of the placement rack, and the monitoring board is in contact with the secondary coil and monitors its surface temperature in real time.

7. The oil-immersed transformer according to claim 1, characterized in that: The air cooling unit includes an air inlet end, an outer surface of the air inlet end is fixedly connected to an air extractor, two ends of the air inlet end are fixedly connected to a ventilation plate 1, a cooling pipe is provided at the bottom of the ventilation plate 1, and a ventilation plate 1 is also provided at the bottom of the cooling pipe, the outer surface of the ventilation plate 1 located at the bottom is fixedly connected to the air outlet end, the outer surface of the air outlet end is provided with an embedded mechanism, and the air extractor is connected to the ventilation plate 1 located at the top through an air pipe; The height of the air inlet end is located above the cooling oil liquid level in the shell, and the air outlet end is located below the cooling oil liquid level.

8. The oil-immersed transformer according to claim 7, characterized in that: The embedded mechanism includes a second ventilation plate, one end of which is provided with a disc, the top of each disc is provided with a vertical pipe, and support rods are provided on both sides of the second ventilation plate. The top of the support rod is fixedly connected to the first support plate, the bottom of the first support plate is fixedly connected to the second telescopic rod, and the output end of the second telescopic rod is fixedly connected to the blocking block; The vertical pipe is embedded between the semicircular notch 1 and the semicircular notch 2; When the telescopic rod 2 is in the output state, the blocking block blocks the cooling gas from flowing through the ventilation plate 2.

9. The oil-immersed transformer according to claim 8, characterized in that: The outer surface of the air inlet end is fixedly connected to the top of the shell, and one end of the second air vent plate is fixedly connected to the outer surface of the air outlet end.

10. The oil-immersed transformer according to claim 1, characterized in that: The oil control unit includes a second support plate, the top of the second support plate is fixedly connected to an oil tank, cooling oil is placed in the oil tank, a pumping machine is provided on one side of the oil tank, an oil inlet pipe and an oil outlet pipe are provided at the bottom of the pumping machine, the bottoms of the oil inlet pipe and the oil outlet pipe are located in the outer shell, a second servo motor is fixedly connected to the outer surface of the oil tank, an output end of the second servo motor is fixedly connected to a rotating shaft, an end of the rotating shaft close to the pumping machine is fixedly connected to a shoveling blade, support columns are provided on the shoveling blades, and gaps are provided between adjacent support columns.

11. A control method for an oil-immersed transformer, applicable to an oil-immersed transformer according to any one of claims 1 to 10, characterized in that: The steps include: S1: Place a certain amount of cooling oil in the housing and the oil control unit in advance, and connect the power supply and load ends to the power insulator and load insulator; S2: After the power is turned on, the voltage is increased or decreased through the transformer unit; S3: The control mechanism will adjust the secondary mechanism according to the actual temperature of the winding; S4: The oil control mechanism and the air cooling unit realize cooling of the transformer unit.

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