Three-phase oil-immersed transformer

Abstract

The invention relates to a three-phase oil-immersed transformer, which relates to the technical field of transformers and comprises a servo motor, a first rotating seat, a second rotating seat, a fixed shaft, a driving gear, a driven gear, a sun shield and the like. A servo motor rotates to drive a driving gear to rotate, when the driving gear rotates, a driven gear fixed to the outer wall of a fixing shaft drives the fixing shaft to rotate, the fixing shaft rotates, and a sun shield rotates, so that the sun shield can cover the upper end of the transformer box; through the arrangement that the sun shield can cover the upper end of the transformer box body, the situation that the transformer box body is heated due to the fact that the external environment is raised due to direct sunlight can be reduced, and therefore the effect of prolonging the service life of the transformer can be achieved, solar energy is converted into electric energy through a solar panel, and the electric energy is stored in a storage battery through a charging controller; power is supplied to the structure of the cooling device through self-generated power, energy is reduced, and energy self-sufficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and in particular to a three-phase oil-immersed transformer. Background Art

[0002] Three-phase oil-immersed transformers are core equipment for voltage conversion and power transmission in power systems and are widely used in power plants, substations, and industrial power distribution. Their operating principle is based on the law of electromagnetic induction, achieving voltage conversion through three-phase windings. Insulating oil serves as both a cooling and insulating medium, ensuring stable operation under high-voltage and high-current conditions. The primary factor determining transformer life is insulation aging, with temperature control playing a crucial role. Every 8°C increase in operating temperature reduces the transformer's lifespan by half. Therefore, effective temperature control is crucial for extending transformer lifespan. In addition to the transformer's own cooling devices, lowering the operating environment is also essential. Generally, the ambient temperature within a box-type transformer should be kept below 40°C. However, oil-immersed transformers are commonly exposed to high temperatures in the summer, exposed to the sun, and operating at full load. This can cause the transformer's temperature to rise continuously, leading to fault alarms and serious lifespan reduction, even leading to burnout.

[0003] An existing patent (publication number: CN114360856B) discloses a three-phase oil-immersed transformer, comprising a transformer body with an inspection port on one side. A heat sink is mounted within the inspection port, with two sets of slidable slots symmetrically arranged on either side. The heat sink comprises side panels, a transverse plate, swinging plates, and a swing mechanism. Two sets of side panels are symmetrically mounted on either side of the inspection port. The transverse plate is horizontally mounted on top of the two sets of side panels. Several sets of swinging plates are evenly spaced between the two sets of side panels, with the tops of the several sets of swinging plates positioned below the transverse plate. The swing mechanism comprises a first rotating disc and a second rotating disc, each movably mounted on the two sets of side panels. A drive motor is mounted at the bottom of the first rotating disc, with the power output of the drive motor connected to the bottom of the first rotating disc. When rapid heat dissipation is required, the swing mechanism and heat dissipation rollers automatically open to dissipate heat, enhancing the automation and intelligence of the device.

[0004] Regarding the above-mentioned related technologies, when rapid heat dissipation is required, the swing mechanism and the heat dissipation roller automatically open and perform heat dissipation processing, thereby improving the automation and intelligence of the device. However, since the transformer is in an external environment, the temperature of the box and its external structure will also rise when exposed to the open air, which will also cause the temperature of the heat sink to increase, thereby reducing the cooling effect of the heat sink. Summary of the Invention

[0005] 1. Technical problems solved The purpose of this application is to provide a three-phase oil-immersed transformer to solve the problem that since the transformer is in an external environment, the temperature of the box and its external structure will also rise when exposed to the open air, thereby causing the temperature of the heat sink to increase, thereby reducing the cooling of the heat sink.

[0006] The present application provides a three-phase oil-immersed transformer adopting the following technical solution: A three-phase oil-immersed transformer, comprising a transformer box, a plurality of heat sinks fixedly provided on all four sides of the outer wall of the transformer box, a fixed bottom plate fixedly provided on one side of the transformer box, an oil change box fixedly provided on the upper end of the fixed bottom plate, support plates fixedly provided on both sides of the oil change box, a first rotating seat fixedly provided on one side of each of the two support plates, and a second rotating seat fixedly provided on the outer wall of the heat sinks at both ends of one side of the transformer box; The two second rotating seats and the two first rotating seats are both internally provided with fixed shafts for rotation, and the multiple fixed shafts are fixedly connected to sun visors in pairs, and the outer walls of the two fixed shafts provided inside the first rotating seat are both fixedly provided with driven gears, and the upper ends of the two support plates are both fixedly provided with servo motors through fixed seats, and the output ends of the two servo motors extend out of the outer wall of one end of the fixed seat and are fixedly provided with driving gears, and the two driving gears are respectively engaged with the two driven gears.

[0007] By adopting the above technical solution, the device is provided with a servo motor, a first rotating seat, a second rotating seat, a fixed shaft, a driving gear, a driven gear and a sun visor. The servo motor rotates to drive the driving gear to rotate. When the driving gear rotates, the driven gear fixed on the outer wall of the fixed shaft drives the fixed shaft to rotate. The fixed shaft rotates the sun visor, so that the sun visor can cover the upper end of the transformer box. By allowing the sun visor to cover the upper end of the transformer box, the external environment caused by direct sunlight can be reduced, which in turn causes the transformer box to heat up, thereby increasing the service life of the transformer.

[0008] Preferably, solar panels are fixedly mounted on the outer walls of the two sun visors, and batteries, charging controllers and PLC controllers are fixedly mounted on the upper ends of the oil change tanks, the charging controllers are electrically connected to the solar panels and batteries, and the PLC controllers are electrically connected to the batteries; By adopting the above technical solution, solar panels, charging controllers and batteries are set up. The batteries are powered by the charging controller and are used to store electrical energy to provide power for electrical components such as servo motors, oil pumps, solenoid valves, and PLC controllers. The charging controller is responsible for processing the electrical energy converted by the solar panels and controlling the charging process of the batteries to ensure safe and stable charging and avoid overcharging or undercharging of the batteries. The solar panels can convert the absorbed solar energy into electrical energy, which is processed by the charging controller and stored in the batteries to provide energy for the equipment. Energy self-sufficiency is achieved through this setting.

[0009] Preferably, an oil pump is fixedly provided at the upper end of the oil change tank, and an oil suction pipe and an oil discharge pipe are fixedly provided at both ends of the oil pump, the end of the oil suction pipe away from the oil pump extends into the interior of the oil change tank, and the end of the oil discharge pipe away from the oil pump extends into the interior of the transformer box; By adopting the above technical solution, an oil extraction pump, an oil extraction pipe and an oil discharge pipe are set up, the oil extraction pump is started, the oil in the oil change tank is extracted through the oil extraction pipe, and then discharged into the transformer box through the oil discharge pipe. Through this setting, the oil in the transformer box that has heated up due to operation is mixed, thereby reducing the temperature of the oil, thereby ensuring the life of the transformer.

[0010] Preferably, a temperature sensor is provided inside the transformer box, and the temperature sensor is electrically connected to the PLC controller; By adopting the above technical solution, the temperature sensor is used to detect the temperature of the oil inside the transformer box. When the specified temperature is reached, a signal is transmitted to the PLC controller. After receiving the signal, the PLC controller turns on the switches of the oil pump and the solenoid valve. The oil pump draws the oil from the oil change tank into the transformer box. The connecting pipe, based on the principle of the connecting pipe, flows the oil in the transformer box into the oil change tank, ensuring that the oil heights in the transformer box and the oil change tank remain unchanged.

[0011] Preferably, a connecting pipe is fixedly connected between the transformer box and the oil change box, a solenoid valve is fixedly sleeved on the outer wall of the connecting pipe, and the solenoid valve is electrically connected to the PLC controller; By adopting the above technical solution, the solenoid valve is opened, and the transformer box and the oil change box form a communicating vessel under the action of the communicating pipe, which can enable the oil in the transformer box to flow into the oil change box, exchanging the high-temperature oil with the low-temperature oil, thereby reducing the temperature of the oil in the transformer box and ensuring the service life. The two form a communicating vessel structure to ensure that the oil levels in the two can be balanced during the oil exchange process, ensuring that the oil volume is within a normal range.

[0012] Preferably, an oil level gauge is fixedly provided on one side of the upper end of the transformer box; By adopting the above technical solution, the oil level gauge is used to detect the position of the insulating oil level inside the transformer box in real time, and the oil level can be judged by observing the changes in the oil level gauge to determine whether the oil level is sufficient. The abnormal rise or fall of the oil level gauge can also be used to determine whether there is a problem with the transformer.

[0013] Preferably, a plurality of low-voltage terminals are fixedly provided on the upper end of the transformer box; By adopting the above technical solution, the low-voltage terminal is the external connection interface of the low-voltage side winding of the transformer, providing users with low-voltage electricity that meets their needs.

[0014] Preferably, a plurality of high-voltage terminals are fixedly provided on the upper end of the transformer box, and the plurality of high-voltage terminals correspond to the low-voltage terminals; By adopting the above technical solution, the function corresponds to that of the low-voltage terminal but is targeted at the high-voltage side.

[0015] 2. Beneficial effects In summary, this application includes at least one of the following beneficial technical effects: 1. The present invention provides a three-phase oil-immersed transformer, which is provided with a servo motor, a first rotating seat, a second rotating seat, a fixed shaft, a driving gear, a driven gear and a sun visor. The servo motor rotates, thereby driving the driving gear to rotate. When the driving gear rotates, the driven gear fixed to the outer wall of the fixed shaft drives the fixed shaft to rotate. The fixed shaft rotates and the sun visor rotates, so that the sun visor can cover the upper end of the transformer box. By enabling the sun visor to cover the upper end of the transformer box, the external environment caused by direct sunlight can be reduced, thereby reducing the temperature rise of the transformer box, thereby increasing the service life of the transformer.

[0016] 2. The present invention provides a three-phase oil-immersed transformer, which is equipped with a solar panel, a charge controller and a battery. The solar panel converts solar energy into electrical energy, which is stored in the battery through the charge controller. The battery provides power for electrical components such as a servo motor, an oil pump, a solenoid valve, and a PLC controller. Self-generated energy is used to provide power for the structure of a cooling device, thereby reducing energy consumption and achieving energy self-sufficiency.

[0017] 3. The present invention provides a three-phase oil-immersed transformer, which is provided with an oil change box, an oil pump, an oil extraction pipe, an oil drain pipe, a connecting pipe, an electromagnetic valve, a temperature sensor and a PLC controller. The temperature sensor is used to detect the temperature of the oil inside the transformer box. When the specified temperature is reached, a signal is transmitted to the PLC controller. After receiving the signal, the PLC controller turns on the switches of the oil extraction pump and the electromagnetic valve. The oil extraction pump extracts the oil from the oil change box into the transformer box. The connecting pipe, based on the principle of a communicating vessel, flows the oil in the transformer box into the oil change box, ensuring that the oil heights in the transformer box and the oil in the oil change box remain unchanged. The transformer box and the oil change box form a communicating vessel under the action of the connecting pipe, which can enable the oil in the transformer box to flow into the oil change box, exchange the high-temperature oil with the low-temperature oil, thereby reducing the temperature of the oil in the transformer box and ensuring its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the right shaft side structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the present invention; Figure 3 A top view of the present invention; Figure 4 It is a structural schematic diagram of the oil changing device of the present invention; Figure 5 Schematic diagram of the transformer structure of the present invention.

[0019] in, 1. Transformer box; 2. Fixed base plate; 3. Oil change tank; 4. Oil pump; 5. Oil extraction pipe; 6. Oil drain pipe; 7. Connecting pipe; 8. Solenoid valve; 9. Battery; 10. Charge controller; 11. PLC controller; 12. Support plate; 13. First rotating seat; 14. Servo motor; 15. Driving gear; 16. Heat sink; 17. Second rotating seat; 18. Fixed shaft; 19. Driven gear; 20. Sun visor; 21. Solar panel; 22. Temperature sensor; 23. Oil level gauge; 24. Low-voltage terminal; 25. High-voltage terminal. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0021] Example 1: A three-phase oil-immersed transformer, referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 4, including a transformer box 1, the transformer box 1 as the core bearing component, the interior contains the core, winding and other key components, and is filled with insulating oil, providing insulation and heat dissipation environment for these components, while protecting the internal structure from the external environment. The outer wall of the transformer box 1 is fixed with a plurality of heat sinks 16. The heat sink 16 continuously dissipates the heat in the box to the outside through natural convection, which is the main heat dissipation method in daily operation. A fixed bottom plate 2 is fixed on one side of the transformer box 1, and an oil change tank 3 is fixed on the upper end of the fixed bottom plate 2. The fixed bottom plate 2 is The oil change box 3 provides a stable installation foundation to ensure that the oil change box 3 is fixed in position during the operation of the transformer. The oil change box 3 is used to store spare low-temperature insulating oil and is connected to the transformer box 1 through a connecting pipe 7. During the oil circulation and cooling process, it receives high-temperature oil from the transformer box 1 and provides low-temperature oil for exchange to achieve oil temperature regulation. Support plates 12 are fixedly provided on both sides of the oil change box 3, and a first rotating seat 13 is fixedly provided on one side of the two support plates 12. The outer walls of the heat sinks 16 at both ends of one side of the transformer box 1 are fixedly provided with second rotating seats 17.

[0022] The two second rotating seats 17 and the two first rotating seats 13 are both rotatably provided with fixed shafts 18, and the multiple fixed shafts 18 are fixedly connected to the sun visors 20 in pairs. The outer walls of the two fixed shafts 18 arranged inside the first rotating seat 13 are fixedly provided with driven gears 19. The upper ends of the two support plates 12 are fixedly provided with servo motors 14 through fixed seats. The output ends of the two servo motors 14 extend out of the outer wall of one end of the fixed seat and are fixed with driving gears 15. The two driving gears 15 are respectively engaged with the two driven gears 19, and the servo motors 14 provide power for angle adjustment of the sun visors 20.

[0023] The technical solution of the above-mentioned device is to set up a servo motor 14, a first rotating seat 13, a second rotating seat 17, a fixed shaft 18, a driving gear 15, a driven gear 19 and a sun visor 20 and other structures. The servo motor 14 rotates, thereby driving the driving gear 15 to rotate. When the driving gear 15 rotates, the driven gear 19 fixed on the outer wall of the fixed shaft 18 will drive the fixed shaft 18 to rotate. The rotation of the fixed shaft 18 drives the sun visor 20 to rotate, so that the sun visor 20 can cover the upper end of the transformer box 1. By enabling the sun visor 20 to cover the upper end of the transformer box 1, the external environment caused by direct sunlight can be reduced, thereby reducing the temperature rise of the transformer box 1, thereby increasing the service life of the transformer.

[0024] Example 2: A three-phase oil-immersed transformer, referring to Figure 2 、 Figure 3 and Figure 4, the outer walls of the two sun visors 20 are fixed with solar panels 21, and the upper ends of the oil change tank 3 are respectively fixed with batteries 9, charging controllers 10 and PLC controllers 11. The battery 9 is powered by the charging controller 10 and is used to store electrical energy to provide power for electrical components such as the servo motor 14, the oil pump 4, the solenoid valve 8, the PLC controller 11, etc., to achieve energy self-sufficiency of the equipment. The charging controller 10 is electrically connected to the solar panels 21 and the battery 9 respectively. The charging controller 10 is responsible for processing the electrical energy converted by the solar panels 21 and controlling the process of charging the battery 9 to ensure safe and stable charging and avoid overcharging or undercharging of the battery 9. The PLC controller 11 is electrically connected to the battery 9. The solar panel 21 can convert the absorbed solar energy into electrical energy, which is processed by the charging controller 10 and stored in the battery 9 to provide energy for the equipment.

[0025] The technical solution of the above device is to set up a solar panel 21, a charging controller 10 and a battery 9, convert solar energy into electrical energy through the solar panel 21, and store it in the battery 9 through the charging controller 10. The battery 9 provides power to electrical components such as the servo motor 14, the oil pump 4, the solenoid valve 8, and the PLC controller 11. The self-generated energy is used to provide electrical energy for the structure of the cooling device, thereby reducing energy and achieving energy self-sufficiency.

[0026] Example 3: A three-phase oil-immersed transformer, referring to Figure 4 and Figure 5The oil pump 4 is fixedly provided on the upper end of the oil change tank 3. It is fixedly provided on the upper end of the oil change tank 3 and is the power source for oil circulation. When the temperature needs to be lowered, the low-temperature oil in the oil change tank 3 is extracted through the oil extraction pipe 5, and then injected into the transformer box 1 through the oil discharge pipe 6 to promote the oil circulation exchange. The two ends of the oil pump 4 are respectively fixedly provided with an oil extraction pipe 5 and an oil discharge pipe 6. The end of the oil extraction pipe 5 away from the oil extraction pump 4 extends into the oil change tank 3, and the end of the oil discharge pipe 6 away from the oil extraction pump 4 extends into the transformer box 1. By setting the oil extraction pump 4, the oil extraction pipe 5 and the oil discharge pipe 6, the oil pump 4 is started, the oil in the oil change tank 3 is extracted through the oil extraction pipe 5, and then discharged into the transformer box 1 through the oil discharge pipe 6. Through this arrangement, the oil in the transformer box 1 that is heated due to work is mixed, thereby reducing the temperature of the oil, thereby ensuring the service life of the transformer. A temperature sensor 22 is provided inside the transformer box 1. The temperature sensor 22 It is connected to the PLC controller 11 by telecommunications, and the temperature sensor 22 is used to detect the temperature of the oil inside the transformer box 1. When the specified temperature is reached, a signal is transmitted to the PLC controller 11. After receiving the signal, the PLC controller 11 turns on the switches of the oil pump 4 and the solenoid valve 8. The oil pump 4 draws the oil from the oil change tank 3 into the interior of the transformer box 1, and the connecting pipe 7, based on the principle of a communicating vessel, flows the oil in the transformer box 1 into the oil change tank 3 to ensure that the oil heights in the transformer box 1 and the oil change tank remain unchanged. A connecting pipe 7 is fixedly connected between the transformer box 1 and the oil change tank 3, and is fixedly connected between the transformer box 1 and the oil change tank 3 to form a communicating vessel structure, ensuring that the oil levels in the two can be kept balanced during the oil exchange process, ensuring that the oil volume is within a normal range. A solenoid valve 8 is fixedly sleeved on the outer wall of the connecting pipe 7, and the fixed sleeve is arranged on the outer wall of the connecting pipe 7 and is controlled by the PLC controller 11. When oil circulation cooling is required, the PLC controller 11 controls it to open, so that the high-temperature oil in the transformer box 1 can flow into the oil change tank 3 through the connecting pipe 7. The solenoid valve 8 is connected to the PLC controller 11 by telecommunications. The solenoid valve 8 is opened, and the transformer box 1 and the oil change tank 3 form a communicating vessel under the action of the connecting pipe 7, which can make the oil in the transformer box 1 flow into the oil change tank 3, exchange the high-temperature oil with the low-temperature oil, and thus reduce the temperature of the oil in the transformer box 1 to ensure its service life. An oil level gauge 23 is fixedly provided on one side of the upper end of the transformer box 1. The oil level gauge 23 is used to The position of the insulating oil level inside the transformer box 1 is detected in real time, and whether the oil amount is sufficient is judged by observing the changes in the oil level gauge 23. The abnormal rise or fall of the oil level gauge 23 can also be used to judge whether there is a problem with the transformer. A plurality of low-voltage terminals 24 are fixedly provided on the upper end of the transformer box 1. The low-voltage terminal 24 is the external connection interface of the low-voltage side winding of the transformer, providing users with low-voltage electricity that meets the needs. A plurality of high-voltage terminals 25 are fixedly provided on the upper end of the transformer box 1. The plurality of high-voltage terminals 25 correspond to the low-voltage terminals 24, and their functions correspond to the low-voltage terminals 24 but are for the high-voltage side.

[0027] The technical solution of the above-mentioned device is to set up structures such as an oil change tank 3, an oil pump 4, an oil extraction pipe 5, an oil discharge pipe 6, a connecting pipe 7, an electromagnetic valve 8, a temperature sensor 22 and a PLC controller 11. The temperature sensor 22 is used to detect the temperature of the oil inside the transformer tank 1. When the specified temperature is reached, a signal is transmitted to the PLC controller 11. After receiving the signal, the PLC controller 11 turns on the switches of the oil pump and the electromagnetic valve 8. The oil pump 4 draws the oil from the oil change tank 3 into the interior of the transformer tank 1, and the connecting pipe 7, based on the principle of a communicating vessel, flows the oil in the transformer tank 1 into the oil change tank 3 to ensure that the oil heights in the transformer tank 1 and the oil change tank 3 remain unchanged. The transformer tank 1 and the oil change tank 3 form a communicating vessel under the action of the connecting pipe 7, which can enable the oil in the transformer tank 1 to flow into the oil change tank 3, exchange the high-temperature oil with the low-temperature oil, thereby reducing the temperature of the oil in the transformer tank 1 and ensuring its service life.

[0028] The operating principle of the present embodiment is as follows: When the transformer is operating, the PLC controller 11 controls the servo motors 14 on the two support plates 12 according to a preset program to start. The driving gear 15 at the output end of the servo motor 14 drives the driven gear 19 to rotate, thereby causing the fixed shaft 18 within the first rotating seat 13 and the second rotating seat 17 to rotate synchronously, achieving the flipping of the sun visor 20. In direct sunlight, the sun visor 20 rotates to cover the upper end of the transformer housing 1, reducing the temperature rise caused by direct sunlight. When there is no strong light, the sun visor 20 can be rotated to a retracted position without affecting natural ventilation and heat dissipation.

[0029] Solar panels 21 on the outer wall of sunshade 20 convert absorbed solar energy into electrical energy, which is processed by charge controller 10 and stored in battery 9. Battery 9 provides power to electrical components such as servo motor 14, oil pump 4, solenoid valve 8, and PLC controller 11, making the cooling device energy-self-sufficient and reducing its dependence on the external power grid.

[0030] Temperature sensor 22 inside transformer case 1 continuously monitors the temperature of the insulating oil and transmits the data to PLC controller 11 in real time. When the oil temperature is below a preset value, the system enters standby mode. When the oil temperature reaches or exceeds the preset value, the cooling mechanism is triggered, and PLC controller 11 simultaneously activates oil pump 4 and opens solenoid valve 8 on connecting pipe 7. Oil pump 4 extracts the low-temperature insulating oil from oil change tank 3 through oil extraction pipe 5 and injects it into transformer case 1 through oil drain pipe 6. Simultaneously, the high-temperature oil in transformer case 1 flows into oil change tank 3 through connecting pipe 7, forming an oil-liquid circulation exchange. Connecting pipe 7 maintains oil level balance between oil change tank 3 and transformer case 1, ensuring that the oil levels in both remain within the normal range. This ensures efficient heat dissipation while preventing oil overflow or insufficient oil from affecting insulation performance.

[0031] The oil level gauge 23 at the top of the box displays the insulating oil level in real time to ensure that the oil volume meets the insulation and heat dissipation requirements; the high-voltage terminal 25 receives external high-voltage electrical energy, and after conversion by the transformer core and winding, outputs low-voltage electrical energy through the low-voltage terminal 24, completing voltage conversion and power transmission.

[0032] All components work together to effectively control the operating temperature of the transformer, improve operating stability and service life, and achieve efficient energy utilization through the sunshade 20 for sun protection, oil circulation for cooling, self-sufficient power supply of the solar panel 21, and intelligent monitoring and control of the temperature sensor 22 and the PLC controller 11.

[0033] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A three-phase oil-immersed transformer, comprising a transformer box (1), characterized in that: A plurality of heat sinks (16) are fixedly provided on the outer wall of the transformer box (1), a fixed bottom plate (2) is fixedly provided on one side of the transformer box (1), an oil change box (3) is fixedly provided on the upper end of the fixed bottom plate (2), support plates (12) are fixedly provided on both sides of the oil change box (3), a first rotating seat (13) is fixedly provided on one side of the two support plates (12), and a second rotating seat (17) is fixedly provided on the outer wall of the heat sinks (16) at both ends of one side of the transformer box (1); The two second rotating seats (17) and the two first rotating seats (13) are both rotatably provided with fixed shafts (18), and the plurality of fixed shafts (18) are fixedly connected to sun visors (20) in pairs. The outer walls of the two fixed shafts (18) provided inside the first rotating seat (13) are both fixedly provided with driven gears (19). The upper ends of the two support plates (12) are both fixedly provided with servo motors (14) through the fixed seats. The output ends of the two servo motors (14) extend out of the outer walls of one end of the fixed seat and are fixedly provided with driving gears (15). The two driving gears (15) are respectively engaged with the two driven gears (19).

2. A three-phase oil-immersed transformer according to claim 1, characterized in that: The outer walls of the two sunshades (20) are fixedly provided with solar panels (21), and the upper ends of the oil change tank (3) are respectively fixedly provided with batteries (9), charging controllers (10) and PLC controllers (11), the charging controllers (10) are respectively electrically connected to the solar panels (21) and the batteries (9), and the PLC controllers (11) are electrically connected to the batteries (9).

3. The three-phase oil-immersed transformer according to claim 1, characterized in that: An oil pump (4) is fixedly provided at the upper end of the oil change box (3), and an oil extraction pipe (5) and an oil discharge pipe (6) are fixedly provided at both ends of the oil pump (4), respectively. The end of the oil extraction pipe (5) away from the oil pump (4) extends into the interior of the oil change box (3), and the end of the oil discharge pipe (6) away from the oil pump (4) extends into the interior of the transformer box (1).

4. A three-phase oil-immersed transformer according to claim 2, characterized in that: A temperature sensor (22) is provided inside the transformer box (1), and the temperature sensor (22) is connected to the PLC controller (11) via telecommunication.

5. The three-phase oil-immersed transformer according to claim 4, characterized in that: A connecting pipe (7) is fixedly connected between the transformer box (1) and the oil change box (3), and a solenoid valve (8) is fixedly sleeved on the outer wall of the connecting pipe (7). The solenoid valve (8) is connected to the PLC controller (11) via telecommunication.

6. The three-phase oil-immersed transformer according to claim 1, characterized in that: An oil level gauge (23) is fixedly provided on one side of the upper end of the transformer box (1).

7. The three-phase oil-immersed transformer according to claim 1, characterized in that: A plurality of low-voltage terminals (24) are fixedly provided on the upper end of the transformer box (1).

8. The three-phase oil-immersed transformer according to claim 7, characterized in that: A plurality of high-voltage terminals (25) are fixedly provided on the upper end of the transformer box (1), and the plurality of high-voltage terminals (25) correspond to the low-voltage terminals (24).

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