750kv large capacity autotransformer for shagot

Abstract

The present application relates to the technical field of transformer, and discloses a 750kV large-capacity autotransformer for sandstorm, which comprises a transformer, sandproof mechanisms arranged on both sides of the transformer, wherein each sandproof mechanism comprises a vane plate, a first gear, a toothed plate, a first wedge-shaped plate and a linkage rod, the vane plate is arranged on one side of the transformer, the first gear is arranged outside the vane plate, the toothed plate is arranged at one end of the transformer, and the first wedge-shaped plate is arranged at one end of the transformer.The mechanical linkage of the thermal bimetallic spiral spring and the air guide plate can automatically adjust the opening degree of the vane according to the oil temperature and the intensity of sandstorm, which helps to relieve the conflict between heat dissipation and sand prevention, the V-shaped inclined fin cooperates with the sand separator, and the accumulated sand automatically slides off by means of gravity and the vibration of the equipment itself, so that the frequency of shutdown and cleaning due to blockage is reduced, the whole system adopts a pure mechanical structure and does not need electronic components, and can maintain a relatively stable working state in harsh environments such as sandstorm and large temperature difference.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically a 750kV large-capacity autotransformer for use in desert areas. Background Technology

[0002] my country's desert, Gobi, and arid regions are rich in natural resources and are core areas for the construction of large-scale clean energy bases. New energy sources exhibit typical characteristics of centralized development, local aggregation, and long-distance transmission. As the scale of new energy grid connection continues to expand and the regional power grid structure is constantly upgraded, ultra-high voltage transmission lines are gradually becoming the key carriers connecting new energy bases and the main grid. This creates clear requirements for the voltage level, capacity specifications, and environmental adaptability of core power equipment. Due to their structural characteristics, autotransformers have become the mainstream equipment for realizing power conversion, voltage regulation, and power transmission at this voltage level. The research and application of such equipment rely on the long-term accumulation of electromagnetic design, insulation structure, leakage flux control, and temperature rise suppression technologies in the field of ultra-high voltage transformers. Combined with the special environmental conditions of the "desert, Gobi, and arid" regions, such as drought, frequent sandstorms, large temperature differences between day and night, and corrosion of saline soil, targeted technical adaptations are carried out in terms of structural layout, material selection, and protection design.

[0003] The main shortcomings of the existing technology are that heat dissipation and sand prevention are difficult to achieve at the same time. Closing the windows to block sand will cause the equipment to overheat, while opening the windows for ventilation will turn the equipment into a sand and dust channel. After sand accumulates between the radiator fins, conventional air blowing is difficult to remove it completely, and it is often necessary to shut down the machine for disassembly and cleaning, which seriously affects the continuous operation of the power station. Summary of the Invention

[0004] Based on this, the purpose of this invention is to provide a 750kV large-capacity autotransformer for use in desert areas, in order to solve the technical problem that it is difficult to achieve both heat dissipation and sand prevention in the existing technology. Closing windows to block sand will cause the equipment to overheat, while opening windows for ventilation will turn it into a sand and dust channel. After sand accumulates between the radiator fins, conventional air blowing is difficult to remove it, and it is often necessary to shut down the machine for disassembly and cleaning, which seriously affects the continuous operation of the power station.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a kV high-capacity autotransformer for use in desert areas, comprising a transformer, wherein sand-proof mechanisms are provided on both sides of the transformer, the sand-proof mechanism comprising blades, a first gear, a toothed plate, a first wedge plate, and a linkage rod, wherein the blades are disposed on one side of the transformer, the first gear is disposed on the outer side of the blades, the toothed plate is disposed at one end of the transformer, the first wedge plate is disposed at one end of the transformer and fixed to the toothed plate, the linkage rod is disposed on one side of the transformer and the blades are linked by the linkage rod, an oil pipe is disposed at one end of the transformer, a heat-conducting block is attached to the outer side of the oil pipe, a bimetallic helical spring is disposed at the top of the heat-conducting block, a fixing plate is disposed at one end of the transformer and the fixing plate cooperates with the bimetallic helical spring, a second wedge block is slidably connected to the outer side of the fixing plate, and a movable plate is disposed at the top of the second wedge block.

[0006] By adopting the above technical solution, the heat-conducting block attached to the outer wall of the oil pipe efficiently conducts heat to multiple sets of bimetallic helical springs fixedly connected to its top. The bimetallic helical springs are made of two metals with significantly different coefficients of thermal expansion. After being heated, they undergo significant elongation deformation along the axial direction. No external power supply or sensor is required. The springs are driven purely by the waste heat of the transformer itself, thus avoiding the risk of electronic component failure in dusty environments.

[0007] Furthermore, air intake plates are provided on both sides of the transformer, and a second gear is connected to one end of the air intake plate. The second gear meshes with the teeth of the moving plate. Fixed blocks that cooperate with the moving plate are provided at both ends of the transformer. A limiting rod that cooperates with the transformer is provided at the top of the second wedge block.

[0008] By adopting the above technical solution, the elongated hot bimetallic helical spring pushes the second wedge block to move away from the oil pipe on the outside of the transformer. The inclined surface of the second wedge block fits with the inclined surface of the first wedge plate, converting the horizontal thrust into a vertical component force, which forces the first wedge plate to move horizontally on the outside of the transformer along the guide column.

[0009] Furthermore, an air guide frame is provided on one side of the transformer, and the air guide frame cooperates with the air guide plate. A base is provided at the bottom of the transformer. Both ends of the transformer are provided with locking blocks that cooperate with the toothed plate. One side of the first wedge plate is opened as an inclined surface and fits against the second wedge block.

[0010] By adopting the above technical solution, when the first wedge plate moves to the outside of the transformer, the toothed plate fixedly connected to its back moves synchronously. The straight rack on the toothed plate pushes the first gear meshing with it to rotate. The rotation of the first gear directly drives the multiple sets of blades fixedly connected to the same axis to rotate synchronously. At the same time, the linkage rod connects all the blades into one piece to ensure that all blades have the same opening degree.

[0011] Furthermore, both ends of the transformer are provided with heat dissipation fins, the bimetallic helical spring is provided with a corresponding guide post inside, multiple sets of V-shaped heat dissipation fins are provided on both sides of the transformer, and sand-separating plates that cooperate with the V-shaped heat dissipation fins are provided on both sides of the transformer.

[0012] By adopting the above technical solution, when the oil temperature rises, the elongation of the bimetallic helical spring increases, the moving distance of the first wedge plate increases, the rotation angle of the first gear increases, the blade opening increases accordingly, the air intake increases, and the heat dissipation capacity is improved. Conversely, when the oil temperature decreases, the bimetallic helical spring contracts, and the pull-back spring pulls the first wedge plate and the gear plate back to their original positions, and the blade opening decreases. This achieves linear proportional control between the blade opening and the oil temperature. The higher the temperature, the larger the opening. The heat dissipation capacity automatically matches the heat generation without manual intervention. The structure is compact, the transmission efficiency is high, and the gear rack is not easy to jam in a dusty environment.

[0013] Furthermore, both sides of the transformer are provided with sandproof shells, and both sides of the transformer are provided with fixed frames that cooperate with the induced draft frame. One end of the first wedge plate is provided with a pull-back spring, and one end of the first wedge plate is provided with a guide post, with the pull-back spring located outside the guide post.

[0014] By adopting the above technical solution, when there is strong wind or sandstorm weather, the high-speed airflow blows directly onto the transformer. The airflow enters the interior of the air intake frame and pushes the air intake plate to rotate around its vertical axis. The rotation angle of the air intake plate is proportional to the wind speed: the higher the wind speed, the greater the extent to which the air intake plate is blown open. The second gear fixedly connected to the bottom of the air intake plate's axis rotates accordingly. The second gear pushes the moving plate meshing with it to move upward in the vertical direction. It should be noted that a torsion spring is preset inside the rotating shaft of the air intake plate to provide a certain elastic restoring force.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) In this invention, the bimetallic spiral spring automatically drives the blades to open and close according to the change of oil temperature in the oil pipe. At the same time, the wind deflector senses the intensity of the external wind and sand and forcibly intervenes to close the blades. The two form antagonistic adjustment through the linkage of the wedge block and the moving plate. When there is no wind or a light wind, the blade opening changes linearly with the temperature to ensure the heat dissipation requirements. When a sandstorm strikes, the wind pressure system intervenes first, and the blades automatically narrow the air intake channel, which not only avoids the equipment from overheating, but also reduces the intake of sand and dust from the source, thus effectively alleviating the inherent contradiction between heat dissipation and sand prevention.

[0016] (2) The present invention uses V-shaped heat dissipation fins arranged at an inclination of 45 degrees on both sides. Combined with the inertial separation effect of the sand separating plate and the arc-shaped guide plate, the sand particles attached to the surface of the fins automatically slide down to the bottom sand collection trough under the combined action of gravity and the power frequency vibration of the equipment itself. This structure can continuously discharge accumulated sand without additional power or manual intervention, effectively reducing the risk of heat dissipation performance decline due to fin blockage and reducing the frequency of equipment shutdown and cleaning.

[0017] (3) The entire sand prevention and heat dissipation adjustment process relies solely on the linkage between mechanical components such as bimetallic spiral springs, wedge blocks, gear racks, and air intake plates. No electronic sensors or external power supply are used. Under harsh conditions such as strong winds, large temperature differences, and salt corrosion common in desert areas, this purely mechanical system can maintain stable operation, avoiding the possibility of electronic components failing due to dust intrusion or drastic temperature fluctuations, thus improving the long-term reliability of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first perspective; Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective; Figure 3 For the present invention Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of the internal structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point B; Figure 6 This is a partial structural diagram of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point C; Figure 8 This is a partial structural diagram of the present invention; Figure 9 This is a schematic diagram showing the position of the second wedge block in this invention; Figure 10 This is a schematic diagram showing the position of the arc-shaped guide plate of the present invention; Figure 11 For the present invention Figure 10 Enlarged view of point D.

[0019] In the diagram: 1. Transformer; 2. Sandproof mechanism; 201. Blade; 202. First gear; 203. Gear plate; 204. First wedge plate; 205. Linkage rod; 3. Air intake frame; 4. Pull-back spring; 5. Guide column; 6. Heat-conducting block; 7. Bimetallic helical spring; 8. Fixing plate; 9. Guide column; 10. V-shaped heat dissipation fins; 11. Base; 12. Sandproof shell; 13. Heat dissipation fins; 14. Sand-separating plate; 15. Air intake plate; 16. Arc-shaped guide plate; 17. Moving plate; 18. Second gear; 19. Oil pipe; 20. Second wedge block. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0021] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0022] like Figures 1 to 11As shown, the present invention provides a 750kV high-capacity autotransformer for use in desert areas, comprising a transformer 1. Sand-proof mechanisms 2 are provided on both sides of the transformer 1. Each sand-proof mechanism 2 includes a blade 201, a first gear 202, a toothed plate 203, a first wedge plate 204, and a linkage rod 205. The blade 201 is located on one side of the transformer 1, the first gear 202 is located outside the blade 201, the toothed plate 203 is located at one end of the transformer 1, and the first wedge plate 204 is located at one end of the transformer 1 and fixed to the toothed plate 203. The linkage rod 205 is located on one side of the transformer 1, and the blade 201 is linked by the linkage rod 205. An oil pipe 19 is provided at one end of the transformer 1, and a heat-conducting material is attached to the outside of the oil pipe 19. Block 6, a heat-conducting block 6, has a bimetallic helical spring 7 at its top. A fixing plate 8 is located at one end of the transformer 1, and the fixing plate 8 cooperates with the bimetallic helical spring 7. A second wedge block 20 is slidably connected to the outside of the fixing plate 8, and a movable plate 17 is located at the top of the second wedge block 20. The heat-conducting block 6, which is attached to the outer wall of the oil pipe 19, efficiently conducts heat to the multiple sets of bimetallic helical springs 7 fixedly connected to its top. The bimetallic helical spring 7 is made of two metals with significantly different coefficients of thermal expansion, wound together. After being heated, it undergoes significant elongation deformation along the axial direction. It requires no external power supply or sensors, relying solely on the transformer's own waste heat for operation, thus avoiding the risk of electronic component failure in dusty environments. For example, both sides of the transformer 1 are provided with air ducts 15, one end of which is connected to a second gear 18, and the second gear 18 meshes with the teeth of the moving plate 17. Both ends of the transformer 1 are provided with fixed blocks that cooperate with the moving plate 17. The top of the second wedge block 20 is provided with a limiting rod that cooperates with the transformer 1. When the first wedge plate 204 moves to the outside of the transformer, the toothed plate 203 fixedly connected to its back moves synchronously. The straight rack on the toothed plate 203 pushes the first gear 202 that meshes with it to rotate. The rotation of the first gear 202 directly drives the multiple sets of blades 201 fixedly connected to the same axis to rotate synchronously. At the same time, the linkage rod 205 connects all the blades 201 into one piece to ensure that the opening of all blades is consistent. For example, a fan frame 3 is provided on one side of transformer 1, and the fan frame 3 cooperates with the fan plate 15. A base 11 is provided at the bottom of transformer 1. Both ends of transformer 1 are provided with locking blocks that cooperate with the toothed plate 203. One side of the first wedge plate 204 is opened as an inclined surface and fits against the second wedge block 20. When the oil temperature rises, the elongation of the thermal bimetallic helical spring 7 increases, the moving distance of the first wedge plate 204 increases, the rotation angle of the first gear 202 increases, and the opening of the blade 201 increases accordingly, increasing the air intake and improving the heat dissipation capacity. Conversely, when the oil temperature drops, the thermal bimetallic helical spring 7 contracts, and the pullback spring 4 pulls the first wedge plate 204 and the toothed plate 203 back to their original positions, and the opening of the blade 201 decreases. This achieves linear proportional control between the blade opening and the oil temperature. The higher the temperature, the larger the opening. The heat dissipation capacity automatically matches the heat generation without manual intervention. The structure is compact, the transmission efficiency is high, and the gear rack is not easy to jam in a dusty environment. For example, both ends of the transformer 1 are provided with heat dissipation fins 13, and the bimetallic spiral spring 7 is provided with a corresponding guide post 9. Both sides of the transformer 1 are provided with multiple sets of V-shaped heat dissipation fins 10, and both sides of the transformer 1 are provided with sand-separating plates 14 that cooperate with the V-shaped heat dissipation fins 10. When there is a strong wind or sandstorm, the high-speed airflow blows directly onto the transformer and enters the air intake frame 3, pushing the air intake plate 15 to rotate around its vertical axis. The rotation angle of the air intake plate 15 is proportional to the wind speed: the higher the wind speed, the greater the extent to which the air intake plate 15 is blown open. The second gear 18 fixedly connected to the bottom of the shaft of the air intake plate 15 rotates accordingly. The second gear 18 pushes the moving plate 17 that meshes with it to move upward in the vertical direction. It should be noted that the rotating shaft of the air intake plate 15 is pre-set with a torsion spring to provide a certain elastic restoring force. For example, both sides of the transformer 1 are provided with sandproof shells 12, and both sides of the transformer 1 are provided with fixed frames that cooperate with the air duct frame 3. One end of the first wedge plate 204 is provided with a pull-back spring 4, and one end of the first wedge plate 204 is provided with a guide post 5, and the pull-back spring 4 is located outside the guide post 5. When the moving plate 17 moves upward, it drives the sliding pin of the second wedge block 20 to lift upward through the vertical elongated hole on it. It should be noted that the second wedge block 20 and the moving plate 17 are slidably connected with a certain gap, rather than being fixedly connected. Therefore, when the moving plate 17 lifts the second wedge block 20 upward, the inclined surface compression relationship between the second wedge block 20 and the first wedge plate 204 is released. Under the pulling force of the pull-back spring 4, the first wedge plate 204 automatically retracts to the inside of the transformer. The retraction of the first wedge plate 204 drives the toothed plate 203 to move in the opposite direction, the first gear 202 rotates in the opposite direction, the opening of the blade 201 decreases, the air intake decreases, thereby reducing the amount of sand and dust sucked into the heat dissipation channel.

[0023] The working principle and usage process of this invention: When transformer 1 is running normally, due to the electromagnetic losses of the iron core and windings, the internal temperature of the transformer gradually increases. The heat is transferred to the oil pipes 19 set on both sides of the transformer through the insulating oil circulation, and the oil temperature inside the oil pipes 19 rises sharply accordingly. The heat-conducting block 6, which is attached to the outer wall of the oil pipe 19, efficiently conducts heat to the multiple sets of thermal bimetallic helical springs 7 fixedly connected to its top. The thermal bimetallic helical springs 7 are made of two metals with significantly different coefficients of thermal expansion. After being heated, they produce significant elongation deformation along the axial direction. They are driven purely by the waste heat of the transformer itself without any external power supply or sensor, thus avoiding the risk of electronic component failure in dusty environments. The elongated bimetallic helical spring 7 pushes the second wedge block 20 to move away from the oil pipe and towards the outside of the transformer. Because the inclined surface of the second wedge block 20 is in contact with the inclined surface of the first wedge plate 204, the second wedge block 20 is squeezed and pushes the first wedge plate 204 to move horizontally towards the outside of the transformer along the guide post 9. (Specifically, when the resistance of the first wedge plate 204 is large, there will be a certain force to squeeze the second wedge block 20 in the opposite direction. At this time, because the material of the air duct plate 15 is iron, it has a certain weight, and a damping shaft is set in the middle, the reverse thrust of the second wedge block 20 caused by the excessive resistance of the sand prevention mechanism 2 is weakened to the maximum extent, and the air duct plate 15 is prevented from being pushed away.) It should be noted that when the first wedge plate 204 moves to the outside of the transformer, the toothed plate 203 fixedly connected to its back moves synchronously. The straight rack on the toothed plate 203 pushes the first gear 202 meshing with it to rotate. The rotation of the first gear 202 directly drives the multiple sets of blades 201 fixedly connected to the same axis to rotate synchronously. At the same time, the linkage rod 205 connects all the blades 201 into one piece to ensure that the opening of all blades is consistent. When the oil temperature rises, the elongation of the bimetallic helical spring 7 increases, the moving distance of the first wedge plate 204 increases, the rotation angle of the first gear 202 increases, and the opening of the impeller 201 increases accordingly, increasing the air intake and improving the heat dissipation capacity. Conversely, when the oil temperature decreases, the bimetallic helical spring 7 contracts, and the pullback spring 4 pulls the first wedge plate 204 and the gear plate 203 back to their original positions, reducing the opening of the impeller 201. This achieves linear proportional control between the impeller opening and the oil temperature; the higher the temperature, the larger the opening. The heat dissipation capacity automatically matches the heat generation without manual intervention. The structure is compact, the transmission efficiency is high, and the gear and rack are not prone to jamming in dusty environments. When there is strong wind or sandstorm weather, the high-speed airflow blows directly onto the transformer. The airflow enters the interior of the air intake frame 3 and pushes the air intake plate 15 to rotate around its vertical axis. The rotation angle of the air intake plate 15 is proportional to the wind speed: the higher the wind speed, the greater the extent to which the air intake plate 15 is blown open. The second gear 18, which is fixedly connected to the bottom of the shaft of the air intake plate 15, rotates accordingly. The second gear 18 pushes the moving plate 17, which meshes with it, to move upward in the vertical direction. It should be noted that a torsion spring is preset inside the rotating shaft of the air intake plate 15 to provide a certain elastic restoring force. When the movable plate 17 moves upward, it drives the sliding pin of the second wedge block 20 to lift upward through the vertical elongated hole on it. It should be noted that the second wedge block 20 and the movable plate 17 are slidably connected with a certain gap, rather than being fixedly connected. Therefore, when the movable plate 17 lifts the second wedge block 20 upward, the inclined surface compression relationship between the second wedge block 20 and the first wedge plate 204 is released. Under the pulling force of the return spring 4, the first wedge plate 204 automatically retracts to the inside of the transformer. The retraction of the first wedge plate 204 drives the toothed plate 203 to move in the opposite direction, the first gear 202 to rotate in the opposite direction, the opening of the blade 201 decreases, the air intake decreases, thereby reducing the amount of sand and dust drawn into the heat dissipation channel. When the wind speed is too high, the wind pressure system "overtakes" the thermal drive system and prioritizes the sand-proof small action to protect the equipment safety. At the same time, since there is a gap between the second wedge block 20 and the moving plate 17, when the second wedge block 20 is lifted by the wind pressure system, it can still move freely in the horizontal direction with the extension and contraction of the thermal spring and will not lose its temperature sensing function because it is lifted. When the outside wind weakens or stops, the wind deflector 15 returns to its vertical position under the action of the preset torsion spring, the moving plate 17 falls, the second wedge block 20 returns to the position of being in contact with the inclined surface of the first wedge plate 204, and the system returns to the state of being controlled by temperature alone.

[0024] The working states of the three example working conditions need to be explained; Operating Condition 1: No wind or light wind + high temperature; At this time, the wind pressure system does not intervene. The second wedge block 20 and the first wedge plate 204 always remain in inclined contact. The oil temperature rises, causing the hot bimetallic spiral spring 7 to extend and push the second wedge block 20, which in turn pushes the first wedge plate 204 and the toothed plate 203. The blade 201 opens to the maximum position according to the temperature requirements, and the heat dissipation capacity reaches its peak. Condition 2: Strong winds and sandstorms + low temperature; The wind-induced plate 15 is turned by the strong wind, and the moving plate 17 lifts the second wedge block 20 to release the inclined surface compression. At this time, the hot bimetallic spiral spring 7 is in a contracted state with low oil temperature. The pullback spring 4 pulls the first wedge plate 204 back to the innermost side, and the blade 201 closes to the minimum opening, leaving only a very small air inlet gap to maintain basic heat dissipation. Most of the sand and dust are blocked outside. Operating Condition 3: Strong winds and sandstorms + high temperature core operating condition; Driven by strong winds, the wind deflector 15 lifts the second wedge block 20. However, the oil temperature is very high at this time. The thrust generated by the extension of the hot bimetallic helical spring 7 counteracts the tension of the return spring 4. Due to the large enough upward force generated by the wind pressure in the design, after the second wedge block 20 is lifted, the first wedge plate 204 will partially retract, but will not completely retract to the innermost side. Finally, the blade 201 is stabilized in a "half-open, half-closed" middle position, which not only retains enough air intake channels to meet the high temperature heat dissipation requirements, but also significantly reduces the cross-sectional area of ​​the air intake to block sand and dust.

[0025] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A 750kV high-capacity autotransformer for use in desert areas, comprising a transformer, characterized in that sand-proof mechanisms are provided on both sides of the transformer, the sand-proof mechanism comprising blades, a first gear, a toothed plate, a first wedge plate, and a linkage rod, the blades being disposed on one side of the transformer, the first gear being disposed on the outer side of the blades, the toothed plate being disposed at one end of the transformer, the first wedge plate being disposed at one end of the transformer and fixed to the toothed plate, the linkage rod being disposed on one side of the transformer and the blades being linked by the linkage rod, an oil pipe being disposed at one end of the transformer, a heat-conducting block being attached to the outer side of the oil pipe, a bimetallic helical spring being disposed at the top of the heat-conducting block, a fixing plate being disposed at one end of the transformer, the fixing plate cooperating with the bimetallic helical spring, a second wedge block being slidably connected to the outer side of the fixing plate, and a movable plate being disposed at the top of the second wedge block; The transformer is equipped with air ducts on both sides, and one end of each air duct is connected to a second gear, which meshes with the teeth of the moving plate. Both ends of the transformer are provided with fixed blocks that cooperate with the movable plate, and the top of the second wedge block is provided with a limiting rod that cooperates with the transformer. Both ends of the transformer are provided with engaging blocks that cooperate with the toothed plate. One side of the first wedge plate is opened as an inclined surface and fits against the second wedge block. A pull-back spring is provided at one end of the first wedge plate, and a guide post is provided at one end of the first wedge plate, with the pull-back spring located outside the guide post; The heat-conducting block, which is attached to the outer wall of the oil pipe, conducts heat to multiple sets of bimetallic helical springs fixedly connected to its top. When the oil temperature rises, the elongation of the bimetallic helical springs increases, the movement distance of the first wedge plate increases, the rotation angle of the first gear increases, and the blade opening increases accordingly. When the oil temperature drops, the bimetallic helical springs contract, and the pullback spring pulls the first wedge plate and the gear plate back to their original positions, and the blade opening decreases.

2. The 750kV high-capacity autotransformer for use in desert areas according to claim 1, characterized in that: A draft fan is provided on one side of the transformer, and the draft fan cooperates with the draft fan plate. A base is provided at the bottom of the transformer.

3. The 750kV high-capacity autotransformer for use in desert areas according to claim 1, characterized in that: The transformer is equipped with heat dissipation fins at both ends, and the bimetallic helical spring is equipped with corresponding guide posts inside.

4. A 750kV high-capacity autotransformer for use in desert areas according to claim 1, characterized in that: Multiple sets of V-shaped heat dissipation fins are provided on both sides of the transformer, and sand-separating plates that cooperate with the V-shaped heat dissipation fins are provided on both sides of the transformer.

5. A 750kV high-capacity autotransformer for use in desert areas according to claim 1, characterized in that: Both sides of the transformer have air guide cavities that cooperate with the arc-shaped guide plates at their top ends, and the fixed plate has cavities that cooperate with the guide columns inside.

6. A 750kV high-capacity autotransformer for use in desert areas according to claim 1, characterized in that: Both sides of the transformer are equipped with sand-proof shells, and both sides of the transformer are equipped with fixing frames that cooperate with the induced draft frame.

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