A fire-fighting transformer

Abstract

This utility model discloses a fire-fighting transformer, including a transformer body, a converter bushing, and an equipment box. In this utility model, an isolation chamber is formed between the telescopic pipe and the converter bushing. During fire extinguishing, a negative pressure pump rapidly removes air from the isolation chamber, while carbon dioxide gas is simultaneously injected into the chamber through a carbon dioxide fire extinguishing canister to extinguish the fire and cool the outer wall of the converter bushing. A temperature sensor can acquire the temperature in the isolation chamber, allowing for easy confirmation of successful fire extinguishing. A motor rotates a cam, which, when rotating, causes a roller located on the cam's convex part to contact the handle of the carbon dioxide fire extinguishing canister, achieving a pressing action and thus initiating the spraying action. When spraying is no longer needed, the motor reverses, causing the roller to disengage from the handle of the carbon dioxide fire extinguishing canister, allowing for precise control of the spray volume.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a fire-fighting transformer. Background Technology

[0002] The transformers in converter stations are expensive and have a unique equipment layout. Designing them solely according to current fire protection codes presents significant flaws. For example, the bushings of converter transformers pass through firewalls and connect to converter valves. An explosion or fire in either the transformer or the bushing would threaten the safety of the converter valve. Furthermore, an explosion or fire in the grid-side bushing of the converter transformer, if not extinguished promptly, would cause the transformer itself to catch fire. Therefore, all bushings of converter transformers should be equipped with fixed water spray protection measures. However, according to Article 3.2.5.2 of the "Design Code for Water Spray Fire Extinguishing Systems," which states that "water mist protecting the top of the transformer should not be sprayed directly onto the high-voltage bushing," the bushing is not within the protection range of the water spray system. In practical application, after an explosion and fire in the grid-side bushing of a converter transformer in a certain converter station, although the water spray system activated promptly and provided sufficient water volume and pressure, effectively protecting the transformer itself, the bushing continued to burn. Firefighters were forced to climb onto the transformer to manually extinguish the fire. Therefore, the existing fire protection methods for converter transformer bushings in converter stations are highly unintelligent.

[0003] To address this, a publicly available technology proposes a converter transformer with a fire-fighting device, including a transformer and a converter transformer bushing. This converter transformer with a fire-fighting device activates an electric actuator, which moves the bushing upwards, thereby moving the telescopic end of the telescopic isolation tube upwards. This reduces contact with oxygen, slowing the combustion rate, and then pulls the steel wire upwards. Because the conduit is held in place by a clamp, the sealing ring is pulled out, allowing INERGEN gas to enter the telescopic isolation tube and extinguish the fire automatically, preventing the need for manual firefighting. However, in the aforementioned disclosed structures, the triggering devices are all disposable. When the telescopic end of the telescopic isolation tube moves, the fire-fighting gas is continuously sprayed after the sealing ring is pulled open by the steel wire. Regardless of whether the fire is successfully extinguished, the fire-fighting gas will be completely exhausted, requiring refilling after use. Furthermore, the structure of pulling the sealing ring is very cumbersome to implement in practical applications, hindering its widespread adoption. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a fire-fighting transformer.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a fire-fighting transformer, comprising a transformer body, a converter bushing, and an equipment box. The converter bushing is disposed on the upper wall of the transformer body. A base is fixedly connected to the upper wall of the transformer body, located on the outer wall of the converter bushing. An air inlet, an air intake, and a fire extinguishing connector are sequentially fixedly connected from front to back on the upper wall of the base, located on the right side of the converter bushing. A telescopic tube is provided between the outer wall of the converter bushing and the upper wall of the base. The telescopic tube consists of an outer sleeve, a first... The device comprises an expansion joint, a second expansion joint, and an inner sleeve. The inner sleeve has an air blowing chamber inside. An isolation chamber for fire extinguishing is provided between the inner wall of the inner sleeve and the converter bushing. The inner wall of the inner sleeve has a temperature detection structure. The equipment box contains a negative pressure pump for sucking out the air inside the isolation chamber, a compressor for generating compressed air, a carbon dioxide fire extinguishing canister for spraying carbon dioxide gas into the isolation chamber for fire extinguishing, a storage tank for storing compressed air and providing compressed air to the air blowing chamber to expand the expansion joint, and a triggering structure for triggering the carbon dioxide fire extinguishing canister.

[0006] As a further description of the above technical solution:

[0007] The triggering structure includes a fixed plate, a motor, a cam, and a roller. The fixed plate is fixedly connected to the inner side wall of the equipment box and located above the carbon dioxide fire extinguisher. The motor is fixedly connected to the upper side of the fixed plate. The cam is rotatably connected to the end of the motor's extended shaft. The roller is rotatably connected to the protruding part of the cam. The roller is driven by the rotation of the motor to intermittently contact the handle of the carbon dioxide fire extinguisher.

[0008] As a further description of the above technical solution:

[0009] The temperature detection structure is a temperature sensor, which is fixedly connected to the inner wall of the inner sleeve. The internal temperature of the isolation chamber is detected by the temperature sensor.

[0010] As a further description of the above technical solution:

[0011] The negative pressure pump, compressor, and carbon dioxide fire extinguishing tank are fixedly connected to the lower inner wall of the equipment box in sequence from front to back, and the gas storage tank is fixedly connected to the upper inner wall of the equipment box.

[0012] As a further description of the above technical solution: the inlet end of the gas storage tank is fixedly connected to the outlet end of the compressor.

[0013] As a further description of the above technical solution:

[0014] The end of the air inlet connector away from the base is fixedly connected to the outlet end of the gas storage tank via an air inlet pipe. The air inlet pipe is connected to the gas storage tank via a solenoid valve. The end of the air intake connector away from the base is connected to the inlet end of the negative pressure pump via an air intake pipe. The end of the fire extinguishing connector away from the base is fixedly connected to the outlet end of the carbon dioxide fire extinguishing tank via a fire extinguishing pipe.

[0015] As a further description of the above technical solution:

[0016] The inner wall of the base is provided with three sets of connecting channels arranged in a front-to-back pattern. The upper wall of the base is provided with an air intake hole and a fire extinguishing hole that communicate with the interior of the isolation chamber. The upper wall of the base is provided with an air inlet hole that communicates with the interior of the blowing chamber. The air inlet hole and the air inlet connector, the air intake hole and the air intake connector, and the fire extinguishing hole and the fire extinguishing connector are each connected by a set of connecting channels.

[0017] As a further description of the above technical solution:

[0018] A top plate is fixedly connected to the upper wall of the inner bushing. The end of the converter bushing away from the transformer body passes through the inner wall of the top plate and is slidably connected to it. The top plate and the outer wall of the converter bushing, the outer sleeve and the first expansion joint, the first expansion joint and the second expansion joint, and the second expansion joint and the inner bushing are respectively sealed by a set of sealing elements. Anti-detachment limiting structures are provided between the outer sleeve and the first expansion joint, the first expansion joint and the second expansion joint, and the second expansion joint and the inner bushing. The lower wall of the outer sleeve is fixedly connected to the upper wall of the base.

[0019] This utility model has the following beneficial effects:

[0020] 1. Compared with existing technologies, this fire-fighting transformer is equipped with a telescopic pipe that can be expanded by compressed air. This pipe can isolate the converter bushing from the outside when needed, forming an isolation chamber between the telescopic pipe and the converter bushing. During fire extinguishing, a negative pressure pump quickly sucks away the air in the isolation chamber, while carbon dioxide gas is injected into the isolation chamber through a carbon dioxide fire extinguishing tank to extinguish the fire and cool the outer wall of the converter bushing. The temperature in the isolation chamber can be obtained through a temperature sensor, which can easily confirm whether the fire extinguishing was successful.

[0021] 2. Compared with existing technologies, this fire-fighting transformer uses a motor to rotate a cam. When the cam rotates, a roller located on the cam cam contactes the handle of the carbon dioxide fire extinguisher to achieve a pressing action, thereby realizing the spraying action of the carbon dioxide fire extinguisher. When spraying is no longer needed, the motor reverses to drive the roller away from the handle of the carbon dioxide fire extinguisher. This allows for more precise control of the spray volume. Furthermore, the replacement of the carbon dioxide fire extinguisher does not interfere with the triggering structure, making maintenance relatively simple. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a fire-fighting transformer proposed in this utility model;

[0023] Figure 2 This utility model proposes a fire-fighting transformer. Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the internal structure of the equipment box of a fire-fighting transformer proposed in this utility model;

[0025] Figure 4 This utility model proposes a fire-fighting transformer. Figure 3 A magnified view of a section at point B in the middle;

[0026] Figure 5 This is a top view schematic diagram of the base and outer sleeve connection structure of a fire-fighting transformer proposed in this utility model;

[0027] Figure 6 This is a partial cross-sectional schematic diagram of the base, telescopic pipe, converter bushing, and top plate connection structure of a fire-fighting transformer proposed in this utility model.

[0028] Figure 7 This utility model proposes a fire-fighting transformer. Figure 6 A magnified view of a section at point C.

[0029] Legend:

[0030] 1. Transformer body; 2. Equipment box; 3. Air inlet; 4. Suction port; 5. Fire extinguishing port; 6. Converter bushing; 7. Base; 8. Telescopic pipe; 801. Outer sleeve; 802. First telescopic joint; 803. Second telescopic joint; 804. Inner sleeve; 805. Air blowing chamber; 9. Top plate; 10. Air inlet connector; 11. Suction connector; 12. Fire extinguishing connector; 13. Air inlet pipe; 14. Suction pipe; 15. Fire extinguishing pipe; 16. Negative pressure pump; 17. Compressor; 18. Air tank; 19. Carbon dioxide fire extinguishing tank; 20. Fixing plate; 21. Motor; 22. Cam; 23. Roller; 24. Connecting channel; 25. Temperature sensor. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1 to 7 This utility model provides a fire-fighting transformer, comprising a transformer body 1, a converter bushing 6, and an equipment box 2. The converter bushing 6 is mounted on the upper wall of the transformer body 1. A base 7 is fixedly connected to the upper wall of the transformer body 1 and located on the outer wall of the converter bushing 6. An air inlet 10, an air intake 11, and a fire extinguishing 12 are fixedly connected sequentially from front to back on the upper wall of the base 7 and located on the right side of the converter bushing 6. A telescopic tube 8 is provided between the outer wall of the converter bushing 6 and the upper wall of the base 7. The telescopic tube 8 is composed of an outer sleeve 801, a first telescopic joint 802, a second telescopic joint 803, and an inner sleeve 804 that are slidably connected from the outside to the inside. The inner sleeve 804 is provided with an air blowing chamber 805. The telescopic tube 8 can be expanded by filling the air blowing chamber 805 with compressed air, thereby covering the entire outer wall of the converter transformer sleeve 6. When not in use, the first telescopic joint 802, the second telescopic joint 803, and the inner sleeve 804 are all retracted inside the outer sleeve 801, which does not affect the heat dissipation of the converter transformer sleeve 6.

[0033] To facilitate isolation and fire extinguishing, an isolation chamber for fire extinguishing is provided between the inner wall of the inner bushing 804 and the converter bushing 6. The isolation chamber is used to isolate the converter bushing 6 from the outside air. After the air in the isolation chamber is sucked away by the negative pressure pump 16, the isolation chamber is made into an oxygen-deficient state, which slows down the combustion rate. Then, carbon dioxide gas is injected into the isolation chamber through the carbon dioxide fire extinguishing tank 19, which can play a role in extinguishing the fire and cooling down, and effectively protect the converter bushing 6.

[0034] To monitor the internal temperature of the isolation chamber, a temperature detection structure is provided on the inner wall of the inner sleeve 804. The temperature detection structure is a temperature sensor 25, which is fixedly connected to the inner wall of the inner sleeve 804. The internal temperature of the isolation chamber is detected by the temperature sensor 25. This embodiment also includes a commonly available controller. The controller receives the internal temperature of the isolation chamber detected by the temperature sensor 25 to determine whether a fire has occurred. The temperature sensor 25 is also used to detect the internal temperature of the isolation chamber after a period of fire extinguishing to determine the fire extinguishing effect.

[0035] To facilitate fire extinguishing, the equipment box 2 is equipped with a negative pressure pump 16 for drawing air out of the isolation chamber, a compressor 17 for generating compressed air, a carbon dioxide fire extinguishing canister 19 for injecting carbon dioxide gas into the isolation chamber to extinguish the fire, a gas storage tank 18 for storing compressed air and supplying compressed air to the air blowing chamber 805 to expand the telescopic pipe 8, and a triggering structure for activating the carbon dioxide fire extinguishing canister 19. The triggering structure includes a fixed plate 20, a motor 21, a cam 22, and a roller 23. The fixed plate 20 is fixedly connected to the inner wall of the equipment box 2 and located above the carbon dioxide fire extinguishing canister 19. The motor 21 is fixedly connected to the upper wall of the fixed plate 20. The cam 22 is rotatably connected to the end of the extended shaft of the motor 21, and the roller 23 is rotatably connected to the cam 22. At the starting point, the roller 23 is driven by the rotation of the motor 21 to intermittently contact the handle of the carbon dioxide fire extinguisher 19. The compressor 17 pre-injects compressed air into the storage tank 18. When a fire occurs, the solenoid valve between the air inlet pipe 13 and the storage tank 18 opens, and the compressed air inside the storage tank 18 quickly fills the blowing chamber 805, thereby causing the telescopic pipe 8 to quickly extend to cover the outer wall of the converter bushing 6. The negative pressure pump 16 sucks away the air inside the isolation chamber, the motor 21 starts, and drives the cam 22 to rotate at a certain angle, so that the roller 23 located on the convex part of the cam 22 squeezes the handle of the carbon dioxide fire extinguisher 19, thereby causing the carbon dioxide fire extinguisher 19 to start spraying carbon dioxide towards the inside of the isolation chamber to achieve the purpose of cooling and extinguishing the fire.

[0036] To allow the negative pressure pump 16 and carbon dioxide fire extinguishing tank 19 to communicate with the isolation chamber and to allow the gas storage tank 18 to communicate with the air blowing chamber 805, the negative pressure pump 16, compressor 17, and carbon dioxide fire extinguishing tank 19 are sequentially and fixedly connected to the lower inner wall of the equipment box 2 from front to back. The gas storage tank 18 is fixedly connected to the upper inner wall of the equipment box 2. The inlet end of the gas storage tank 18 is fixedly connected to the outlet end of the compressor 17. The end of the air inlet connector 10 away from the base 7 is fixedly connected to the outlet end of the gas storage tank 18 through the air inlet pipe 13. The air inlet pipe 13 is connected to the gas storage tank 18 through a solenoid valve. The end of the suction connector 11 away from the base 7 is connected to the inlet end of the negative pressure pump 16 through the suction pipe 14. The end of the fire extinguishing connector 12 away from the base 7 is fixedly connected to the outlet end of the carbon dioxide fire extinguishing tank 19 through the fire extinguishing pipe 15. Three sets of connection channels 24 are sequentially arranged in a front-to-back pattern on the inner wall of the base 7. The upper wall of the base 7 is provided with an air intake hole 4 and a fire extinguishing hole 5 that communicate with the interior of the isolation chamber. The upper wall of the base 7 is provided with an air inlet hole 3 that communicates with the interior of the air blowing chamber 805. The air inlet hole 3 and the air inlet connector 10, the air intake hole 4 and the air intake connector 11, and the fire extinguishing hole 5 and the fire extinguishing connector 12 are respectively connected by a set of connecting channels 24. The air inlet pipe 13 and the air inlet connector 10 are also provided with a commonly available electric exhaust valve. The air inlet pipe 13, the air intake pipe 14, the fire extinguishing pipe 15, the negative pressure pump 16 and the carbon dioxide fire extinguishing tank 19 can communicate with the isolation chamber, and the gas storage tank 18 can communicate with the interior of the air blowing chamber 805. The negative pressure pump 16 sucks out the air inside the isolation chamber not only to reduce the oxygen inside the isolation chamber, but also, after the fire is extinguished, after the compressed air inside the air blowing chamber 805 is released through the electric exhaust valve, the negative pressure pump 16 continues to suck out the gas inside the isolation chamber, which can drive the telescopic pipe 8 to retract and reset.

[0037] To allow the telescopic tube 8 to expand after inflation, a top plate 9 is fixedly connected to the upper wall of the inner sleeve 804. The end of the converter transformer sleeve 6 away from the transformer body 1 passes through the inner wall of the top plate 9 and is slidably connected to it. The top plate 9 and the outer wall of the converter transformer sleeve 6, the outer sleeve 801 and the first telescopic joint 802, the first telescopic joint 802 and the second telescopic joint 803, and the second telescopic joint 803 and the inner sleeve 804 are respectively sealed by a set of sealing elements. Anti-detachment limiting structures are provided between the outer sleeve 801 and the first telescopic joint 802, the first telescopic joint 802 and the second telescopic joint 803, and the second telescopic joint 803 and the inner sleeve 804. The lower wall of the outer sleeve 801 is fixedly connected to the upper wall of the base 7. The limiting structure is a mature technology currently available on the market, and its purpose is to ensure that each telescopic joint will not completely detach when it is unfolded.

[0038] Working principle: The telescopic pipe 8 expands after being filled with compressed air into the air chamber 805, thus covering the entire outer wall of the converter bushing 6. When not in use, the first telescopic joint 802, the second telescopic joint 803, and the inner bushing 804 are all retracted inside the outer sleeve 801, without affecting the heat dissipation of the converter bushing 6. The isolation chamber is used to isolate the converter bushing 6 from the outside air. After the air in the isolation chamber is sucked away by the negative pressure pump 16, the isolation chamber is in an oxygen-deficient state, which slows down the combustion rate. Then, carbon dioxide is sprayed through the carbon dioxide extinguishing canister 19. Carbon gas entering the isolation chamber effectively extinguishes the fire and cools the room, thus protecting the converter bushing 6. This embodiment also includes a commonly available controller that receives the internal temperature of the isolation chamber from the temperature sensor 25 to determine if a fire has occurred. The temperature sensor 25 is also used to detect the internal temperature of the isolation chamber after a period of fire extinguishing to assess the effectiveness of the extinguishing. When a fire occurs, the solenoid valve between the air inlet pipe 13 and the air tank 18 opens, and compressed air from the air tank 18 quickly fills the blowing chamber 805. This causes the telescopic pipe 8 to extend rapidly to cover the outer wall of the converter bushing 6. The negative pressure pump 16 draws air out of the isolation chamber, the motor 21 starts, and drives the cam 22 to rotate at a certain angle. This causes the roller 23 located on the convex part of the cam 22 to squeeze the handle of the carbon dioxide fire extinguisher 19, thereby causing the carbon dioxide fire extinguisher 19 to start spraying carbon dioxide into the isolation chamber to achieve the purpose of cooling and extinguishing the fire. A commonly available electronically controlled exhaust valve is also installed between the air inlet pipe 13 and the air inlet connector 10. Through the air inlet pipe 13 and the suction pipe 14 The fire extinguishing pipe 15, negative pressure pump 16, and carbon dioxide fire extinguishing tank 19 are connected to the isolation chamber, and the gas storage tank 18 is connected to the inside of the air blowing chamber 805. The negative pressure pump 16 sucks out the air inside the isolation chamber not only to reduce the oxygen inside the isolation chamber, but also, after the fire is extinguished, after the compressed air inside the air blowing chamber 805 is released through the electrically controlled exhaust valve, the negative pressure pump 16 continues to suck out the gas inside the isolation chamber, which can drive the telescopic pipe 8 to retract and reset. The limiting structure is a mature technology that is currently available on the market, and its purpose is to ensure that each telescopic joint will not completely detach when it is deployed.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A fire type transformer characterized by: The system includes a transformer body (1), a converter bushing (6), and an equipment box (2). The converter bushing (6) is located on the upper wall of the transformer body (1). A base (7) is fixedly connected to the upper wall of the transformer body (1) and the outer wall of the converter bushing (6). An air inlet connector (10), an air intake connector (11), and a fire extinguishing connector (12) are fixedly connected sequentially from front to back on the upper wall of the base (7) and the right side of the converter bushing (6). A telescopic pipe (8) is provided between the outer wall of the converter bushing (6) and the upper wall of the base (7). The telescopic pipe (8) consists of an outer sleeve (801), a first telescopic joint (802), a second telescopic joint (803), and an inner sleeve that are slidably connected sequentially from the outside to the inside. The inner sleeve (804) is equipped with an air blowing chamber (805) inside. An isolation chamber for fire extinguishing is provided between the inner wall of the inner sleeve (804) and the converter sleeve (6). A temperature detection structure is provided on the inner wall of the inner sleeve (804). The equipment box (2) is equipped with a negative pressure pump (16) for sucking out the air inside the isolation chamber, a compressor (17) for generating compressed air, a carbon dioxide fire extinguishing tank (19) for spraying carbon dioxide gas into the isolation chamber for fire extinguishing, a gas storage tank (18) for storing compressed air and providing compressed air to the air blowing chamber (805) to open the telescopic pipe (8), and a triggering structure for triggering the carbon dioxide fire extinguishing tank (19).

2. A fire rated transformer according to claim 1, characterised in that: The triggering structure includes a fixed plate (20), a motor (21), a cam (22), and a roller (23). The fixed plate (20) is fixedly connected to the inner wall of the equipment box (2) and located above the carbon dioxide fire extinguisher (19). The motor (21) is fixedly connected to the upper wall of the fixed plate (20). The cam (22) is rotatably connected to the end of the extended shaft of the motor (21). The roller (23) is rotatably connected to the protruding part of the cam (22). The roller (23) is driven by the rotation of the motor (21) to intermittently contact the handle of the carbon dioxide fire extinguisher (19).

3. A fire rated transformer as claimed in claim 1, wherein: The temperature detection structure is a temperature sensor (25), which is fixedly connected to the inner wall of the inner sleeve (804). The internal temperature of the isolation chamber is detected by the temperature sensor (25).

4. A fire rated transformer as claimed in claim 1, wherein: The negative pressure pump (16), compressor (17) and carbon dioxide fire extinguishing tank (19) are fixedly connected to the lower inner wall of the equipment box (2) in sequence from front to back, and the gas storage tank (18) is fixedly connected to the upper inner wall of the equipment box (2).

5. A fire rated transformer as claimed in claim 1, wherein: The inlet end of the gas storage tank (18) is fixedly connected to the outlet end of the compressor (17).

6. A fire rated transformer as claimed in claim 1, wherein: The end of the air inlet connector (10) away from the base (7) is fixedly connected to the outlet end of the gas storage tank (18) through the air inlet pipe (13). The air inlet pipe (13) and the gas storage tank (18) are connected through a solenoid valve. The end of the air intake connector (11) away from the base (7) is connected to the inlet end of the negative pressure pump (16) through the air intake pipe (14). The end of the fire extinguishing connector (12) away from the base (7) is fixedly connected to the outlet end of the carbon dioxide fire extinguishing tank (19) through the fire extinguishing pipe (15).

7. A fire rated transformer as claimed in claim 1, wherein: The inner wall of the base (7) is provided with three sets of connecting channels (24) arranged in a front-to-back pattern. The upper wall of the base (7) is provided with an air intake hole (4) and a fire extinguishing hole (5) that communicate with the interior of the isolation chamber. The upper wall of the base (7) is provided with an air inlet hole (3) that communicates with the interior of the air blowing chamber (805). The air inlet hole (3) and the air inlet connector (10), the air intake hole (4) and the air intake connector (11), and the fire extinguishing hole (5) and the fire extinguishing connector (12) are respectively connected by a set of connecting channels (24).

8. A fire rated transformer as claimed in claim 1, wherein: The upper wall of the inner bushing (804) is fixedly connected to the top plate (9). The end of the converter bushing (6) away from the transformer body (1) passes through the inner wall of the top plate (9) and is slidably connected to it. The top plate (9) and the outer wall of the converter bushing (6), the outer sleeve (801) and the first expansion joint (802), the first expansion joint (802) and the second expansion joint (803), and the second expansion joint (803) and the inner bushing (804) are respectively sealed by a set of sealing elements. The outer sleeve (801) and the first expansion joint (802), the first expansion joint (802) and the second expansion joint (803), and the second expansion joint (803) and the inner bushing (804) are all provided with anti-detachment limiting structures. The lower wall of the outer sleeve (801) is fixedly connected to the upper wall of the base (7).

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