400kV-level single-phase transformer

Abstract

The invention discloses a 400kV-level single-phase transformer, which relates to the technical field of single-phase transformers and comprises a single-phase transformer body, a mounting base, a stable frame and heat dissipation units, the heat dissipation units are arranged on two sides of the body, the upper end of the body is connected with an insulating top cover, and the lower end of the body is connected with a high-voltage insulating substrate; the mounting base sleeves the lower end of the body, is internally provided with a stable base and an insulating shock pad, and is provided with ventilating grilles on two sides; the stable frame comprises an L-shaped clamping frame, and the inner side is provided with an insulating telescopic supporting column abutting against the body. The heat dissipation unit comprises a forced air cooling box body, the rear end of the forced air cooling box body is provided with a dust blocking net plate, and a cleaning roller brush is arranged in a side box. L-shaped clamping frames are triggered through gravity to automatically surround a body, multi-dimensional stabilization is achieved in cooperation with insulation telescopic supporting columns and compression springs, and the installation efficiency and the positioning precision are improved; the heat dissipation unit combines temperature sensing and automatic cleaning, guarantees heat dissipation efficiency, reduces maintenance cost, is suitable for a 400 kV high-voltage working condition, and improves equipment operation stability and safety.

Description

Technical Field

[0001] This invention relates to the field of single-phase transformer technology, specifically a 400kV single-phase transformer. Background Technology

[0002] As a core piece of equipment in high-voltage power transmission and distribution systems, 400kV single-phase transformers are widely used in long-distance power transmission, grid connection of new energy power plants, and regional power grid interconnection. Their operational stability, ease of installation, and high-voltage safety performance directly affect the reliable power supply of the power system. In existing technologies, 400kV single-phase transformers typically include core structures such as the transformer body, mounting base, stabilizing components, and heat dissipation units. The main function of the stabilizing components is to fix the transformer body within the mounting base, preventing displacement caused by operational vibration or external impacts, and ensuring the connection reliability of critical components such as high-voltage bushing terminals.

[0003] However, existing methods for securing 400kV single-phase transformers have significant shortcomings: due to the transformer's large weight and the high positioning accuracy requirements of high-voltage conditions, current technologies often rely on manual adjustment of bolt-type clamping components to fix the transformer. This not only requires multiple operators working together, resulting in lengthy installation and commissioning times and high labor intensity, but also easily leads to uneven clamping forces in different directions due to human error. In practical applications, this method reduces installation efficiency and makes it difficult to guarantee the accuracy of transformer positioning. This makes the transformer prone to slight displacement during long-term operation under vibration or sudden impacts, affecting the connection stability of the high-voltage bushing terminals and potentially causing high-voltage discharge risks due to changes in insulation gaps. Therefore, it cannot fully meet the stringent requirements of 400kV high-voltage conditions for equipment installation accuracy and operational stability. Summary of the Invention

[0004] The purpose of this invention is to provide a 400kV single-phase transformer to solve the problems of existing 400kV single-phase transformers that rely on manual adjustment of bolt-type clamping components to fix the main body, resulting in low installation efficiency, high positioning accuracy affected by human operation, easy component loosening due to vibration during long-term operation, and difficulty in meeting the stringent requirements of high-voltage operating conditions for equipment stability and safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a 400kV single-phase transformer, comprising a single-phase transformer body, a mounting base, a stabilizing frame, and a heat dissipation unit. The single-phase transformer body has heat dissipation units attached to both sides of its surface, and an insulating top cover is fixedly connected to the top. Several high-voltage bushing terminals are arranged on the upper surface of the insulating top cover, and a high-voltage insulating base plate is fixedly connected to the bottom. The mounting base is fitted onto the lower end of the single-phase transformer body. Openings are provided around the outer end, and a stabilizing frame is provided inside each opening. Ventilation grilles are provided on both sides of the mounting base. A stabilizing base is connected to the center inside the mounting base. Insulating shock-absorbing pads are provided around the upper surface of the stabilizing base, and the high-voltage insulating base plate at the lower end of the single-phase transformer body is placed on the upper end of the stabilizing base. The stabilizing frame includes an L-shaped clamping frame set inside the opening. Two sets of insulated telescopic supports are arranged and installed on the inner surface of the L-shaped clamping frame. The front ends of the insulated telescopic supports are in close contact with the outer end surface of the single-phase transformer body. The heat dissipation unit includes a forced air cooling box, a dust blocking mesh plate is fixedly installed at the rear end of the forced air cooling box, and the side boxes connected to both sides of the forced air cooling box are equipped with cleaning roller brushes for cleaning the dust blocking mesh plate.

[0006] Preferably, in the mounting base, the stabilizing base and the insulating damping pad are correspondingly arranged, and the number of insulating damping pads is not less than four, which are evenly distributed around the upper surface of the stabilizing base, and the upper surface of the insulating damping pads is completely attached to the lower surface of the high voltage insulating substrate.

[0007] Preferably, each of the two forced air-cooled housings of the heat dissipation unit has a mounting plate fixedly connected to its outer end on the side closest to the single-phase transformer body. The outer ends of the mounting plates are fixedly installed on the center of both sides of the single-phase transformer body by bolts. A dust filter plate is fixedly installed on the front surface of the forced air-cooled housing, and a chip removal groove is opened on the lower surface.

[0008] Preferably, the forced air-cooled housing has a guide rail in the center and a support plate inside. The two ends of the support plate are slidably fitted inside the guide rail. Three sets of cooling fans are arranged in the center of the support plate. The lower end of the support plate extends to the lower surface of the forced air-cooled housing and is equipped with a drive end. The outer end of the drive end is fixed to the lower surface of the forced air-cooled housing by bolts.

[0009] Preferably, a guide screw and a guide post are sequentially installed in the center of the interior of each of the two side boxes. Sliding sleeves are respectively fitted on the outer ends of the guide screw and the guide post. Cleaning roller brushes are fixedly installed on the inner surfaces of the two sliding sleeves. The outer ends of the cleaning roller brushes are in contact with the surface of the dust-blocking mesh plate, and the lower end of the dust-blocking mesh plate is parallel to the chip discharge groove. A driven gear plate is fixedly installed on the lower surface of the guide screw. A drive motor is installed in the center of the lower surface of the forced air-cooled box. A lead screw is fixedly connected to the output end of the drive motor. The end of the lead screw away from the drive motor meshes with the driven gear plate for transmission.

[0010] Preferably, the L-shaped clamping frame has a through groove at the upper end and extends into the interior of the mounting base at the lower end, and is distributed around the interior of the mounting base. A compression spring is fixedly connected to the lower surface, and the lower end of the compression spring is fixedly connected to the interior bottom surface of the mounting base.

[0011] Preferably, a screw is installed inside the through groove, a slider is sleeved on the outer end of the screw, a pressure plate is fixedly installed on the front surface of the slider, and the lower surface of the pressure plate is respectively attached to the four sides of the upper surface of the insulating top cover.

[0012] Preferably, a driven inclined gear disk is fixedly installed at the lower end of the screw, and an active inclined gear disk is provided on one side of the upper surface of the driven inclined gear disk. The outer end of the active inclined gear disk meshes with the outer end of the driven inclined gear disk, and a wrench tooth groove is connected to the outer end surface of the L-shaped clamping frame extending from the axial surface of the active inclined gear disk.

[0013] Preferably, the dustproof mesh plate has fixed brackets on both sides of its inner surface, and a temperature sensor is fixedly installed in the center of the fixed brackets. The temperature sensor is electrically connected to the cooling fan.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes the transformer's own gravity to trigger the L-shaped clamping frame to automatically move towards the main body and surround and position itself. Initial fixation can be completed without additional power or complex tools. Combined with the top compaction of the pressure plate to form multi-dimensional constraints, compared with existing technologies, it not only significantly reduces the operational intensity and debugging time of installers, but also avoids the stability deviation caused by manual intervention, ensuring that key components such as high-voltage bushing terminals maintain stable connection during operation.

[0015] This invention achieves both weight-bearing and electrical isolation functions simultaneously through a high-voltage insulating substrate, forming a closed-loop insulation with the insulating top cover. At the same time, its edge triggers a gravity stabilization mechanism, linking insulation protection with equipment positioning. Compared with existing technologies, this invention not only enhances the insulation reliability under high-voltage conditions, but also reduces the risk of component loosening due to vibration through structural synergy, thereby improving overall safety redundancy.

[0016] This invention uses a temperature sensor to dynamically adjust the fan speed, enabling energy saving by stopping at low temperatures and accelerating at high temperatures to enhance heat dissipation. Combined with the base ventilation grille, it improves air circulation efficiency. At the same time, the automatic cleaning mechanism inside the side box can clean the filter without stopping the machine, and the debris is automatically collected through the debris discharge groove. Compared with the existing technology, this not only reduces the ineffective energy consumption of the heat dissipation system, but also avoids power outages caused by filter maintenance, and significantly reduces the workload of manual maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the single-phase transformer body structure of the present invention; Figure 3 This is a schematic diagram of the heat dissipation unit structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the heat dissipation unit of the present invention; Figure 5 This is a schematic diagram of the lower end structure of the heat dissipation unit of the present invention; Figure 6 This is a schematic diagram of the internal structure of the mounting base of the present invention; Figure 7 This is a schematic diagram of the stable frame structure of the present invention.

[0018] In the diagram: 1. Single-phase transformer body; 11. Insulating top cover; 12. High-voltage insulating base plate; 13. High-voltage bushing terminal; 2. Mounting base; 21. Ventilation grille; 22. Stable base; 23. Insulating shock-absorbing pad; 3. Stable frame; 31. L-shaped clamping frame; 32. Insulating telescopic support; 33. Compression spring; 34. Screw; 35. Slider; 36. Pressure plate; 37. Driven inclined gear plate; 38. Driving inclined gear plate; 39. Wrench tooth groove 4. Heat dissipation unit; 41. Forced air cooling enclosure; 42. Side box; 43. Mounting plate; 44. Guide rail; 45. Dust filter plate; 46. Support plate; 47. Cooling fan; 48. Dustproof mesh plate; 49. Guide screw; 410. Sliding sleeve; 411. Cleaning roller brush; 412. Guide column; 413. Fixed bracket; 414. Temperature sensor; 415. Drive end; 416. Driven gear plate; 417. Lead screw; 418. Drive motor. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-7As shown, this invention provides a technical solution: a 400kV single-phase transformer, comprising a single-phase transformer body 1, a mounting base 2, a stabilizing frame 3, and a heat dissipation unit 4. Through modular integrated design, it solves problems such as insufficient seismic stability, easy degradation of heat dissipation efficiency, and cumbersome filter cleaning and maintenance in traditional 400kV transformers, achieving stable operation under high-voltage conditions, intelligent heat dissipation, and convenient maintenance. The single-phase transformer body 1 is the core component, with an insulating top cover 11 fixed at the upper end, and several high-voltage bushing terminals 13 arranged on the surface of the insulating top cover 11 to achieve 400kV high-voltage power transmission and distribution. A high-voltage insulating base plate 12, which serves as both insulation and load-bearing transition function, is fixed at the lower end. Symmetrical components are attached to both sides of the single-phase transformer body 1. The heat dissipation unit 4 is fitted with a mounting base 2 at its lower end. The mounting base 2 has four symmetrical openings around its outer perimeter, and each opening is fitted with a set of sturdy frames 3. To achieve both shock resistance and stability, the mounting base 2 adopts a hollow frame structure with ventilation grilles 21 on both sides for ventilation and dust prevention. The sturdy base 22 is fixed in the center inside. At least four insulating shock-absorbing pads 23 are evenly distributed around the upper surface of the sturdy base 22. The high-voltage insulating base plate 12 of the single-phase transformer body 1 is completely attached to the insulating shock-absorbing pads 23 to form a bottom elastic buffer. The sturdy frame 3 is based on an L-shaped clamping frame 31. Two sets of insulating telescopic pillars 32 are provided vertically on the inner side of the L-shaped clamping frame 31, and the front end of the insulating telescopic pillars 32 elastically abuts against the single-phase transformer. The transformer body 1 is horizontally clamped. The lower end of the L-shaped clamping frame 31 extends into the mounting base 2 and is connected to the bottom surface of the mounting base 2 through the compression spring 33 to form a vertical elastic support. A screw 34 passes through the through groove at the upper end of the L-shaped clamping frame 31. A slider 35 is sleeved on the outer end of the screw 34 and connected to a pressure plate 36. The pressure plate 36 fits against the perimeter of the insulating top cover 11. The lower end of the screw 34 is provided with a driven inclined gear 37, which meshes with an active inclined gear 38. The extended end of the active inclined gear 38 is provided with a wrench tooth groove 39, which can be used to adjust the clamping force of the pressure plate 36. The intelligent heat dissipation and cleaning system consists of two sets of symmetrical heat dissipation units 4. Each unit is fixed to both sides of the single-phase transformer body 1 by bolts through the mounting plate 43 of the forced air cooling box 41. The front end of the cold box 41 is equipped with a dust filter plate 45 and the bottom end has a chip discharge groove. The interior is equipped with a guide rail 44, and the support plate 46 slides along the guide rail 44. Three sets of cooling fans 47 are arranged on the plate. The wind speed of the cooling fans 47 is adjusted by the drive end 415. The rear end of the forced air cooling box 41 is equipped with a dust blocking plate 48. The side boxes 42 on both sides are equipped with guide screws 49 and guide columns 412. The sliding sleeve 410 drives the cleaning roller brush 411 to fit against the dust blocking plate 48. The driven gear plate 416 at the lower end of the guide screw 49 meshes with the lead screw 417 of the drive motor 418, so that the cleaning roller brush 411 cleans up and down and the debris is discharged through the chip discharge groove. The fixed bracket 413 inside the dust blocking plate 48 is equipped with a temperature sensor 414, which is electrically connected to the cooling fan 47 to form a temperature feedback control.

[0021] according to Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the heat dissipation unit 4 has two symmetrical structures. Each unit is bolted to both sides of the single-phase transformer body 1 via the mounting plate 43 of the forced air cooling housing 41. The rigid connection ensures structural stability and heat transfer efficiency during heat dissipation. A dust filter plate 45 is installed at the front end of the forced air cooling housing 41, and a dust blocking plate 48 is installed at the rear end, forming a double filtration structure to prevent external dust and impurities from entering the forced air cooling housing 41, thus avoiding dust accumulation on the heat dissipation components and resulting in efficiency degradation. A chip removal groove is opened at the lower end of the forced air cooling housing 41 to collect debris generated during cleaning. A guide rail 44 is opened in the center of the forced air cooling housing 41. The support plate 46 slides along the guide rail 44, and three sets of cooling fans 47 are arranged on the plate. The drive end 415 at the lower end of the support plate 46 is electrically connected to the cooling fans 47. The fan speed of the cooling fans 47 can be controlled by adjusting the output power of the drive end 415 to adapt to the heat dissipation requirements under different heat dissipation conditions. The filter features a self-cleaning function. Guide screws 49 and guide posts 412 are sequentially installed in the side boxes 42 connected to both sides of the forced air-cooled housing 41. A cleaning roller brush 411 is fixed inside the sliding sleeve 410 at the outer end of the guide screws 49 and guide posts 412. The cleaning roller brush 411 is in close contact with the surface of the dust-blocking screen 48. The driven gear 416 at the lower end of the guide screw 49 meshes with the lead screw 417 at the output end of the drive motor 418, which drives the cleaning roller brush 411 to roll up and down along the dust-blocking screen 48 for cleaning. The debris generated during cleaning is automatically discharged through the debris discharge groove, and the filter can be cleaned without disassembly. The temperature sensor 414 on the fixed bracket 413 inside the dust-blocking screen 48 is electrically connected to the cooling fan 47 to form a temperature feedback control loop. It can monitor the ventilation temperature of the forced air-cooled housing 41 in real time. When the temperature exceeds the set threshold, the cooling fan 47 is automatically started and automatically stopped when the temperature drops, achieving intelligent energy-saving heat dissipation.

[0022] according to Figure 1 and Figure 6As shown, the mounting base 2 provides stable support and shock absorption for the single-phase transformer body 1. Ventilation grilles 21 are installed on both sides of the mounting base 2 to ensure airflow between the inside and outside of the mounting base 2, assisting the heat dissipation unit 4 in forming convection heat dissipation, while also preventing external debris from entering the mounting base 2 and damaging its components. A stable base 22 is welded to the center of the mounting base 2. The stable base 22, as the load-bearing core, evenly distributes the weight of the single-phase transformer body 1 to the entire mounting base 2. At least four insulating shock-absorbing pads 23 are evenly distributed around its surface. The stable base 22 and the insulating shock-absorbing pads... The pads 23 are set one-to-one. The high-voltage insulating base plate 12 at the lower end of the single-phase transformer body 1 is completely attached to the upper surface of the insulating damping pad 23. The insulating damping pad 23 is made of high-elasticity high-voltage resistant insulating material, which can effectively absorb the vibration energy generated by the single-phase transformer body 1 during operation, and at the same time buffer external impact loads to avoid component loosening or insulation failure caused by vibration. The four openings symmetrically opened around the outer end of the mounting base 2 provide precise installation positioning for the stabilizing frame 3, so that the stabilizing frame 3 and the mounting base 2 form a synergistic stabilizing structure, further improving the overall seismic performance; thus achieving dual protection of seismic resistance and stability.

[0023] according to Figure 1 , Figure 6 and Figure 7 As shown, the lower end of the L-shaped clamping frame 31 extends into the interior of the mounting base 2 and is symmetrically distributed around the perimeter of the mounting base 2. The compression spring 33, which is fixedly connected to the lower surface of the L-shaped clamping frame 31, is fixedly connected to the bottom surface of the interior of the mounting base 2, forming a vertical elastic support structure. This, together with the insulating damping pad 23, buffers vertical vibration and provides preload. A screw 34 passes through the through groove at the upper end of the L-shaped clamping frame 31. The outer end of the screw 34 is threaded onto the slider 35. The pressure plate 36, which is fixed to the front surface of the slider 35, fits against the perimeter of the upper surface of the insulating top cover 11. The slider 35 is driven to move horizontally by the rotation of the screw 34. The screw 34 is moved to achieve precise clamping of the insulating top cover 11 to limit top displacement. To improve the convenience of adjustment, the driven inclined gear 37 is fixedly installed at the lower end of the screw 34, which meshes with the active inclined gear 38 on one side of the upper surface. The part of the active inclined gear 38 extending from the axis of the L-shaped clamping frame 31 has a wrench tooth groove 39. The gear transmission can be driven by an ordinary wrench to adjust the clamping force of the pressure plate 36. No special tool is needed to insert into the wrench tooth groove 39 to rotate and drive the gear transmission, thereby driving the screw 34 to rotate and adjust the clamping force of the pressure plate 36. On-site debugging can be completed without special tools.

[0024] The overall effect achieved by the organization is as follows: To adapt to 400kV high-voltage operating conditions, the equipment adopts an insulation protection design of "upper and lower closed loop + internal and external isolation". The high-voltage insulating base plate 12, which is fixedly connected to the lower end of the transformer body 1, is made of high-temperature and high-voltage resistant epoxy glass cloth board, which has sufficient structural strength. It not only bears the weight of the body, but also completely electrically isolates the conductive components inside the body from the external mounting base 2, forming a double insulation barrier. The mounting base 2 adopts a hollow frame structure, which forms a wrap-around support for the lower end of the transformer body 1. The transformer's own weight triggers the automatic clamping of the stabilizing frame 3. When the transformer body 1 is hoisted into the mounting base 2, the body gradually adheres to the insulating damping pad 23 on the upper surface of the stabilizing base 22 through the lower high-voltage insulating base plate 12. As the body is fully positioned, its own weight will exert continuous pressure on the insulating damping pad 23. At the same time, the edge of the high-voltage insulating base plate 12 will exert downward pressure on the horizontal section of the L-shaped clamping frame 31. In its natural state, the upper surface of the horizontal section of the L-shaped clamping frame 31 is slightly higher than the insulating damping pad. The initial height of pad 23, when the weight of the body acts on the horizontal section, will drive the L-shaped clamping frame 31 to rotate slightly around the lower connection point, so that the vertical section moves closer to the body. Finally, the four sets of L-shaped clamping frames 31 automatically surround the outside of the transformer body 1, forming the initial positioning. The insulating damping pad 23 is made of high elasticity and high voltage resistant nitrile rubber material. There are no less than four of them, which are evenly distributed on the four corners of the upper surface of the stable base 22. When bearing the weight of the body, it will produce moderate elastic deformation. On the one hand, it will evenly transfer the weight of the body to the entire mounting base 2, avoiding local stress concentration. On the other hand, it will absorb the vertical vibration energy generated by the body during operation through deformation. Combined with the horizontal constraint of the L-shaped clamping frame 31, it forms a basic anti-seismic structure of "vertical buffer + horizontal limit". The ventilation grilles 21 opened on both sides of the mounting base 2 adopt a louver design, which not only ensures the air circulation between the inside of the base and the outside, preventing the insulating damping pad 23 from aging and hardening due to long-term closed environment, but also prevents external debris from entering the inside of the base, thus taking into account both ventilation and protection functions.To enhance stability, the stabilizing frame 3 employs triple clamping reinforcement. Horizontally, two sets of insulating telescopic supports 32 are installed along the height of the inner surface of the vertical section of the L-shaped clamping frame 31. When the body's weight drives the L-shaped clamping frame 31 towards the main body, the contacts of the insulating telescopic supports 32 first contact the outer surface of the transformer body 1. As the main body continues to descend, the insulating telescopic supports 32 are compressed, and the internal springs generate a continuous horizontal preload, ensuring the contacts are tightly pressed against the main body surface. This limits the horizontal displacement of the main body during operation and absorbs horizontal vibration and impact energy through the elastic deformation of the springs, ensuring electrical safety. Vertically, the lower end of the vertical section of the L-shaped clamping frame 31 extends into the mounting base 2. A compression spring 33 is welded to the lower surface, and the lower end of the compression spring 33 is fixed to a pre-embedded steel plate on the bottom surface of the base. When the body's weight presses down on the horizontal section of the L-shaped clamping frame 31, the compression spring 33 is simultaneously compressed, generating an upward elastic support force. This force interacts with the insulating... The upward reaction force of the shock-absorbing pad 23 forms a synergistic effect, creating a "bidirectional elastic constraint" on the main body. This not only suppresses the vertical jump of the main body during operation but also provides protection against sudden loads such as earthquakes. The horizontal section of the L-shaped clamping frame 31 has a through slot, through which a screw 34 is connected to the inner wall of the through slot via a bearing. The outer end of the screw 34 is threaded onto a slider 35. An insulating rubber pad is attached to the lower surface of the pressure plate 36 welded to the front surface of the slider 35. After the main body is positioned, the operator inserts a wrench into the active inclined gear plate 3. The outer end of the wrench tooth groove 39 rotates, and the active inclined plate 38 drives the meshing driven inclined plate 37 to rotate, thereby causing the screw 34 to rotate synchronously. The slider 35 moves along the screw 34, pushing the pressure plate 36 to fit tightly against the upper surface of the insulating top cover 11. At this time, the downward pressure of the pressure plate 36 is balanced with the upward force of the insulating shock-absorbing pad 23 and the clamping spring 33, which accurately fixes the body inside the base, ensuring the connection stability of the top components such as the high-voltage bushing terminal 13 and avoiding loosening of the wiring caused by vibration.

[0025] During transformer operation, the copper losses of the coils and the iron losses of the core generate a large amount of heat. If the temperature is too high, it will accelerate the aging of the insulation. Therefore, temperature control is achieved through heat dissipation unit 4. Two sets of heat dissipation units 4 are symmetrically fixed to the two sides of the transformer body 1 by mounting plates 43 and bolts on the side of the forced air cooling box 41. Thermal grease is applied to the contact surface between the mounting plates 43 and the body to improve heat conduction efficiency. A support plate 46 is slidably connected to the guide rail 44 opened in the center inside the forced air cooling box 41. Three sets of axial flow cooling fans 47 are evenly arranged on the support plate 46. The fan power can be adjusted by the drive end 415 at the lower end. The fixing bracket 41 on the inner surface of the dust filter plate 48 A temperature sensor 414 is installed on the 3-axis. This sensor is electrically connected to the frequency converter controller of the cooling fan 47 to form a temperature feedback control loop. When the temperature sensor 414 detects that the internal temperature of the cabinet reaches the set threshold, it immediately sends a signal to start the cooling fan 47. The fan draws in cold air from the outside through the dust filter plate 45 at the front end. When the cold air flows through the inside of the cabinet, it exchanges heat with the surface of the body and absorbs heat before being discharged from the dust filter plate 48 at the rear end, forming a directional air cooling channel. When the temperature drops to a safe range, the fan automatically stops to achieve energy-saving operation. According to the temperature change, the drive end 415 can dynamically adjust the fan speed to adapt to different heat-generating conditions. During long-term operation, dust filter plate 45 and dust blocking screen plate 48 are prone to dust accumulation, resulting in increased ventilation resistance and reduced heat dissipation efficiency. The equipment achieves non-stop maintenance through the automatic cleaning mechanism inside the side box 42. The cleaning cycle can be preset by the controller or started by monitoring the pressure difference before and after the filter screen by the differential pressure sensor. During cleaning, the drive motor 418 starts, and the lead screw 417 at its output end drives the meshing driven gear plate 416 to rotate. The guide screw 49, which is fixedly connected to the driven gear plate 416, rotates synchronously. The guide screw 49 and the sliding sleeve 410 at the outer end of the guide column 412 slide up and down along the guide column 412 under the thread drive. The cleaning roller brush 411 fixed inside the sliding sleeve 410 synchronously rolls against the surface of the dust blocking screen plate 48, brushing off the attached dust. The brushed debris falls to the chip discharge groove at the lower end of the forced air cooling box 41 under the action of gravity and is discharged to the collection box through the hose connected to the groove. Cleaning can be completed without disassembling the filter screen, which greatly reduces the amount of maintenance work.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 400kV single-phase transformer, comprising a single-phase transformer body (1), a mounting base (2), a stable frame (3) and a heat dissipation unit (4), characterized in that: the single-phase transformer body (1) is provided with a heat dissipation unit (4) on each side surface, an insulating top cover (11) is fixedly connected to the upper end of the single-phase transformer body (1), a plurality of high-voltage bushing terminals (13) are arranged on the upper surface of the insulating top cover (11), and a high-voltage insulating base plate (12) is fixedly connected to the lower end of the single-phase transformer body (1); the mounting base (2) is correspondingly sleeved on the lower end of the single-phase transformer body (1), openings are formed in the outer end of the mounting base (2), the stable frame (3) is arranged in each opening, ventilation grilles (21) are arranged on the side surfaces of the mounting base (2), a stable base (22) is connected to the inside of the mounting base (2), insulating shock-absorbing pads (23) are arranged around the upper surface of the stable base (22), and the high-voltage insulating base plate (12) at the lower end of the single-phase transformer body (1) is placed on the upper end of the stable base (22); the stable frame (3) comprises an L-shaped clamping frame (31) arranged in the opening, two groups of insulating telescopic struts (32) are arranged on the inner side surface of the L-shaped clamping frame (31), and the front ends of the insulating telescopic struts (32) abut against the outer end surface of the single-phase transformer body (1); the heat dissipation unit (4) comprises a forced air cooling box body (41), a dust prevention net plate (48) is fixedly installed on the rear end of the forced air cooling box body (41), and a cleaning roller brush (411) for cleaning the dust prevention net plate (48) is arranged in a side box (42) connected to the two side surfaces of the forced air cooling box body (41).

2. The 400 kV single-phase transformer according to claim 1, characterized in that: In the mounting base (2), the stable base (22) and the insulating shock-absorbing pads (23) are correspondingly arranged, the number of the insulating shock-absorbing pads (23) is not less than four, the insulating shock-absorbing pads (23) are evenly distributed around the upper surface of the stable base (22), and the upper surface of the insulating shock-absorbing pad (23) is completely attached to the lower surface of the high-voltage insulating base plate (12).

3. The 400 kV single-phase transformer according to claim 1, characterized in that: The forced air cooling box bodies (41) of the two heat dissipation units (4) are fixedly connected with mounting plates (43) on the side surface close to the single-phase transformer body (1), the mounting plates (43) are fixedly installed on the central part of the two side surfaces of the single-phase transformer body (1) through bolts, dust prevention filter screen plates (45) are fixedly installed on the front end surfaces of the forced air cooling box bodies (41), and chip removal grooves are formed on the lower end surfaces of the forced air cooling box bodies (41).

4. The 400 kV single-phase transformer according to claim 3, characterized in that: A guide rail (44) is formed in the central part of the forced air cooling box body (41), a bearing plate (46) is arranged in the forced air cooling box body (41), the two ends of the bearing plate (46) are slidably fitted in the guide rail (44), three groups of heat dissipation fans (47) are arranged on the central part of the bearing plate (46), a driving end (415) is arranged on the lower end of the bearing plate (46) and extends to the lower end surface of the forced air cooling box body (41), and the driving end (415) is fixedly installed on the lower surface of the forced air cooling box body (41) through a bolt.

5. The 400 kV single-phase transformer according to claim 3, characterized in that: Two said side box (42) inside central are sequentially installed with guide screw (49) and guide column (412), guide screw (49) and guide column (412) outer end are respectively sleeved with sliding sleeve (410), two sliding sleeve (410) inner side surface fixedly installed with cleaning roller brush (411), cleaning roller brush (411) outer end and dust screen (48) surface contact, and the lower end of dust screen (48) is parallelly arranged with the chip removal groove;The lower end surface of the guide screw (49) is fixedly installed with a driven gear (416), and the central lower end surface of the forced air cooling box (41) is installed with a driving motor (418), the output end of the driving motor (418) is fixedly connected with a screw rod (417), and the end of the screw rod (417) away from the driving motor (418) is engaged with the driven gear (416) for transmission cooperation.

6. The 400 kV single-phase transformer according to claim 1, characterized in that: The L-shaped clamping frame (31) is provided with a through slot at the upper end, and the lower end extends into the inside of the mounting base (2) and is distributed along the periphery of the inside of the mounting base (2). The lower surface is fixedly connected with a compression spring (33), and the lower end of the compression spring (33) is fixedly connected to the bottom surface around the inside of the mounting base (2).

7. The 400 kV single-phase transformer according to claim 6, characterized in that: The through slot is provided with a screw rod (34), the outer end of the screw rod (34) is sleeved with a sliding block (35), the front surface of the sliding block (35) is fixedly installed with a pressing plate (36), and the lower surface of the pressing plate (36) is respectively attached to the upper surface around the insulating top cover (11).

8. The 400 kV single-phase transformer according to claim 7, characterized in that: The lower end of the screw rod (34) is fixedly installed with a driven inclined gear (37), the upper surface of the driven inclined gear (37) is provided with a driving inclined gear (38), the outer end of the driving inclined gear (38) is engaged with the outer end of the driven inclined gear (37), and the shaft surface of the driving inclined gear (38) extends out of the outer end surface of the L-shaped clamping frame (31) and is connected with a wrench gear slot (39).

9. A 400 kV class single-phase transformer according to claim 4, characterized in that: The inner side surface of the dust screen (48) is fixedly connected with a fixed support (413) on both sides, the central fixed support (413) is fixedly installed with a temperature sensor (414), and the temperature sensor (414) is electrically connected with the cooling fan (47).

Images