Power electrical transformer with lightning protection function

Abstract

The invention relates to the technical field of transformers, and discloses a power electrical transformer with a lightning protection function, the power electrical transformer comprises a transformer body, and a lightning rod is mounted in the middle of the top of the transformer body; heat dissipation assemblies used for assisting cooling are installed on the inner walls of the two sides of the transformer body, each heat dissipation assembly comprises a heat dissipation fin plate and a heat dissipation box, the heat dissipation boxes are installed on the inner walls of the two sides of the transformer body, and the heat dissipation fin plates are installed on the sides, away from the transformer body, of the heat dissipation boxes in a linear arrangement mode; a fan for dissipating heat through wind power is installed on one side of the heat dissipation box, and a cooling assembly for cooling through liquid cooling is installed in the heat dissipation box. By means of the flame-retardant assembly and the blocking assembly, the oxygen content in the transformer body can be reduced, the fire extinguishing effect is affected, arc extinguishing can be conducted through impact of sulfur hexafluoride gas on electric arcs, and it is avoided that combustion of the transformer body is aggravated due to arc discharge, and larger loss is caused.

Description

A power transformer with lightning protection function Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a power transformer with lightning protection function. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, the secondary coil, and the iron core (magnetic core). Its main functions include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer).

[0003] However, existing transformers have significant safety hazards during operation: their lack of active fire extinguishing devices makes it impossible to quickly suppress the spread of fire. More seriously, the equipment structure fails to achieve automatic sealing during a fire, allowing external oxygen to continuously enter the combustion zone, creating a combustion-supporting effect. Simultaneously, the residual electric arc inside the transformer cannot be extinguished in time, and the continuously generated high temperatures significantly prolong the combustion period. These multiple failure mechanisms work together to ultimately cause fire losses to expand exponentially. Therefore, this invention provides a power transformer with lightning protection to solve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a power transformer with lightning protection function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a power transformer with lightning protection function, comprising a transformer body, wherein a lightning rod is installed at the middle position of the top of the transformer body; heat dissipation components for auxiliary cooling are installed on both inner walls of the transformer body, the heat dissipation components include heat dissipation fins and heat dissipation boxes, the heat dissipation boxes are installed on both inner walls of the transformer body, the heat dissipation fins are linearly arranged on the side of the heat dissipation box away from the transformer body, a fan for cooling by wind power is installed on one side of the heat dissipation box, and a cooling component for cooling by liquid cooling is installed inside the heat dissipation box; a flame-retardant component for fire extinguishing by gas spray is installed inside the cooling component, and a sealing component for sealing the heat dissipation box is also installed inside the cooling component; a triggering component for shutting down the fan and the main circuit inside the transformer body is installed inside the flame-retardant component, the triggering component is activated by the temperature rise inside the transformer body.

[0006] As a further embodiment of the present invention, the cooling assembly includes an outer tube and a cooler. Both ends of the inner wall of the heat sink are bolted to mounting brackets. There are multiple outer tubes, and each of the multiple outer tubes is installed between two mounting brackets. Adjacent outer tubes are connected by a connecting pipe. An inner tube is installed inside the outer tube. The cooler is installed on one side of the mounting bracket located at the bottom. The two ends of the inner tube are connected to the output end and the input end of the cooler, respectively.

[0007] As a further embodiment of the present invention, the flame-retardant component includes a nozzle, which is linearly arranged and installed on the outer wall of an outer tube located in the middle. The inner wall of the nozzle has a through spray hole. A fixing plate is installed on the side of the spray hole near the outer tube. A first spring is fixedly connected to the axis of the fixing plate. A plug is installed on the other end of the first spring. A fusible rod is installed on the end of the plug away from the fixing plate. A flow divider plate is fixedly connected to the other end of the fusible rod. The flow divider plate is snowflake-shaped. A connecting rod is fixedly connected between the flow divider plate and the nozzle.

[0008] As a further embodiment of the present invention, the flame-retardant component also includes a gas storage box, which is installed on the inner wall of the outer tube, and the inner tube is installed at the axial position of the inner wall of the gas storage box. A gas storage cavity is opened on the inner wall of the gas storage box, and the gas storage cavity stores sulfur hexafluoride gas. Both ends of the gas storage cavity are provided with through exhaust holes, and a one-way valve is installed in the exhaust hole.

[0009] As a further embodiment of the present invention, a second spring is installed on the inner wall of the top of the gas storage tank, a pressure plate is installed at the bottom of the second spring, the pressure plate is slidably connected to the inner wall of the gas storage tank, a sealing rod is fixedly connected to the bottom of the pressure plate, an electric push rod is fixedly connected to the inner wall of the bottom of the gas storage tank, a push plate is fixedly connected to the top of the electric push rod, and the push plate has an air hole adapted to the sealing rod.

[0010] As a further embodiment of the present invention, the triggering component includes a trigger switch, an air chamber is provided inside the plug, the trigger switch is fixedly connected to the side of the air chamber away from the fuse rod, the trigger switch is electrically connected to the control circuit of the one-way valve, the fan and the transformer body, a piston disc is fixedly connected to the outer wall of the fuse rod, the piston disc is slidably connected to the inner wall of the air chamber, and the air chamber located on the side of the piston disc away from the trigger switch is filled with inert gas.

[0011] As a further embodiment of the present invention, a plurality of equally spaced guide plates are installed between the two mounting brackets, and the outer tube is installed on the inner wall of the guide plate.

[0012] As a further embodiment of the present invention, a perforated plate is fixedly connected to the heat dissipation box near the heat dissipation fins. A plurality of air holes arranged in a circular pattern are opened at one end of the perforated plate. A connecting groove is opened at the axial position of the perforated plate. The connecting groove is connected to the air holes. An elastic block is fixedly connected to the inner wall of the connecting groove.

[0013] As a further embodiment of the present invention, the sealing component includes activated carbon, which is fixedly connected to the inner wall of the guide plate near the transformer body. The activated carbon contains adsorbed water. A piston plate is slidably connected to the guide plate near the orifice plate. A sliding rod is fixedly connected to one end of the piston plate, and a pressing disc is fixedly connected to the other end of the sliding rod. The pressing disc is slidably connected to the inner wall of the connecting groove on the orifice plate and contacts the elastic block.

[0014] As a further embodiment of the present invention, multiple connecting columns arranged in a linear pattern are installed at both ends of the outer wall of one side of the heat dissipation fin, and a ribbon is installed between two adjacent connecting columns. The ribbon is made of a flexible material.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the present invention is used, the flame-retardant components and sealing components can isolate the transformer body from the outside, preventing external oxygen from continuously entering the transformer body and prolonging the combustion time of the transformer body. Furthermore, the oxygen is replaced by the spraying of sulfur hexafluoride gas, further reducing the oxygen content in the transformer body and affecting the fire extinguishing effect. In addition, the arc can be extinguished by the impact of sulfur hexafluoride gas on the electric arc, preventing the electric arc discharge from causing the transformer body to burn more intensely and causing greater losses.

[0016] 2. When this invention is used, the fan and cooling components can dissipate heat from the transformer body through the combined action of air cooling and liquid cooling, thereby improving the heat dissipation effect of the transformer body and preventing overheating and fire caused by the transformer body.

[0017] 3. When using this invention, the push plate and electric actuator can continuously deliver sulfur hexafluoride gas into the nozzle for spraying, improving the guidance and flow speed of the sulfur hexafluoride gas, and preventing the sulfur hexafluoride gas from failing to be delivered into the nozzle for spraying in time, thus affecting the fire extinguishing effect.

[0018] 4. When this invention is used, the lightning rod actively attracts lightning through the tip discharge effect, and conducts the lightning current to the ground through the neutral point of the low-voltage winding, thus preventing the transformer body from being struck by lightning and burning. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the structure of a power transformer with lightning protection function.

[0020] Figure 2 is a schematic diagram of the heat dissipation component in a power transformer with lightning protection function.

[0021] Figure 3 is a cross-sectional view of the heat dissipation box in a power transformer with lightning protection function.

[0022] Figure 4 is a schematic diagram of the cooling component in a power transformer with lightning protection function.

[0023] Figure 5 is a cross-sectional view of the nozzle in a power transformer with lightning protection function.

[0024] Figure 6 is a cross-sectional view of the plug in a power transformer with lightning protection function.

[0025] Figure 7 is a cross-sectional view of the current guide plate in a power transformer with lightning protection function.

[0026] Figure 8 is a cross-sectional view of the orifice plate in a power transformer with lightning protection function.

[0027] Figure 9 is a cross-sectional view of the outer tube of a power transformer with lightning protection function.

[0028] Figure 10 is a cross-sectional view of the gas storage tank in a power transformer with lightning protection function.

[0029] Figure 11 is an exploded view of the internal structure of the gas storage tank in a power transformer with lightning protection function.

[0030] Figure 12 is a schematic diagram of the heat dissipation fins in a power transformer with lightning protection function.

[0031] In the diagram: 100, Transformer body; 110, Lightning rod; 120, Base frame; 121, Casters; 200, Heat dissipation fins; 210, Connecting column; 211, Streamer; 300, Heat dissipation box; 310, Fan; 320, Nozzle; 321, Fixing plate; 322, First spring; 323, Plug; 324, Trigger switch; 330, Orifice plate; 331, Air vent; 332, Elastic block; 340, Fuse rod; 341, Connector 342. Rod; 343. Diverter plate; 344. Piston disc; 345. Limiting disc; 400. Mounting bracket; 410. Outer tube; 411. Inner tube; 420. Guide plate; 421. Activated carbon; 422. Piston plate; 423. Sliding rod; 424. Extrusion disc; 430. Refrigerator; 440. Gas storage tank; 441. Exhaust port; 450. Pressure plate; 451. Second spring; 452. Sealing rod; 460. Push plate; 461. Electric push rod. Detailed Implementation

[0032] 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.

[0033] Please refer to Figures 1-4. In this embodiment of the invention, a power transformer with lightning protection function includes a transformer body 100. Insulating sleeves are installed at both ends of the top of the transformer body 100. Terminals for connecting to external lines are installed on the top of the insulating sleeves. A base frame 120 for docking installation is installed at the bottom of the transformer body 100. Casters 121 for auxiliary movement are installed at the bottom of the base frame 120. A low-voltage winding and a high-voltage winding for voltage conversion are installed inside the transformer body 100. The high-voltage winding and the low-voltage winding are respectively connected to the insulating sleeves at both ends. The neutral point of the low-voltage winding is grounded, thereby forcing the neutral line potential to be consistent with the ground, avoiding zero-point drift caused by load imbalance. The transformer body 100 has a neutral point grounded at the top center. A lightning rod 110 is installed at the location, connected to the neutral point of the low-voltage winding. The lightning rod 110 actively attracts lightning through the tip discharge effect, conducting the lightning current to the ground through the neutral point of the low-voltage winding. Heat dissipation components for auxiliary cooling are installed on both inner walls of the transformer body 100. These components include heat dissipation fins 200 and heat dissipation boxes 300. The heat dissipation boxes 300 are installed on both inner walls of the transformer body 100. Connecting brackets are installed on all four sides of the heat dissipation box 300 closest to the transformer body 100, and these brackets are bolted to the inner wall of the transformer body 100. The heat dissipation fins 200 are linearly arranged on the side of the heat dissipation box 300 furthest from the transformer body 100. A fan 310 for wind-driven cooling is installed on one side of the heat dissipation box 300. Fans 310 are bolted to the four corners of the heat sink 300 near the transformer body 100. The heat sink 300 has through ventilation holes at the locations of the fans 310. When the fans 310 are turned on, hot air inside the transformer body 100 is exchanged through the ventilation holes into the heat sink 300. The heat sink 300 contains a liquid-cooled cooling assembly. The combined action of airflow and liquid cooling dissipates heat from the transformer body 100, improving the heat dissipation effect. The cooling assembly also contains a flame-retardant component that assists in fire suppression via gas spraying. Furthermore, the cooling assembly contains a sealing component for sealing the heat sink 300. In the event of a fire inside the transformer body 100, the sealing component seals the heat sink 300, preventing external oxygen from entering the transformer. The transformer body 100 is combustion-supporting, and the gas spraying through the flame-retardant components replaces the internal oxygen, further reducing the oxygen content inside the transformer body 100 and the oxygen content required for combustion, thus extinguishing the fire in the transformer body 100. The flame-retardant components are equipped with a triggering component for shutting down the fan 310 and the main circuit inside the transformer body 100. The triggering component is activated by the increase in temperature inside the transformer body 100. When a fire occurs, the triggering component controls the fan 310 to shut down, preventing the fan 310 from accelerating the airflow exchange inside and outside the transformer body 100 and continuously providing oxygen for the combustion of the transformer body 100, which would affect the fire extinguishing effect. In addition, the triggering component controls the shutdown of the main circuit inside the transformer body 100, preventing the continuous discharge of electric arc inside the transformer body 100 and intensifying the combustion.

[0034] The cooling assembly includes an outer tube 410 and a cooler 430. Mounting brackets 400 are bolted to both ends of the inner wall of the heat sink 300. Each mounting bracket 400 has multiple linearly arranged first fixing holes. Multiple outer tubes 410 are installed on the inner wall of the first fixing holes between two mounting brackets 400. Adjacent outer tubes 410 are connected by connecting pipes. An inner tube 411 is installed inside each outer tube 410. The cooler 430 is installed on one side of the mounting bracket 400 at the bottom. The inner tube 411 is connected to the output and input ends of the cooler 430, respectively. The cooler 430 delivers cooled coolant to the inner tube 411. The coolant flows within the inner tube 411, exchanging heat with the airflow entering the heat sink 300 and reducing the temperature of the airflow entering the transformer body 100. After heat exchange, the coolant flows back to the cooler 430 along the inner tube 411.

[0035] Referring to Figures 5 and 6, the flame-retardant assembly includes a nozzle 320, which is linearly arranged and installed on the outer wall of the outer tube 410 located in the middle. The nozzle 320 is located on the side closer to the transformer body 100. A through spray hole is opened on the inner wall of the nozzle 320, and the center of the spray hole is truncated cone-shaped. A fixing plate 321 is installed on the side of the spray hole near the outer tube 410. Multiple first overflow grooves are opened in the fixing plate 321 in a circular arrangement. A first spring 322 is fixedly connected to the axis of the fixing plate 321. A plug 323 is installed on the other end of the first spring 322. The plug 323 is truncated cone-shaped. A fuse rod 340 is installed on the end of the plug 323 away from the fixing plate 321. The fuse rod 340 is made of tin. When the fuse is not broken, the first spring 322 is in a stretched state. The other end of the fuse rod 340 is fixedly connected to the diverter plate 342, which is snowflake-shaped. A connecting rod 341 is fixedly connected between the diverter plate 342 and the nozzle 320. When a fire occurs inside the transformer body 100, the fuse rod 340 can be broken by high temperature. Under the elastic force of the first spring 322, the plug 323 can be moved away from the trigger switch 324, which can release the blockage of the spray hole. The gas in the fan 310 can be sprayed out through the spray hole on the nozzle 320. The gas is sprayed to the diverter plate 342. The snowflake-shaped design of the diverter plate 342 can disperse the gas and expand the spray area, thereby improving the fire extinguishing effect.

[0036] Referring to Figures 9-11, the flame-retardant assembly also includes a gas storage box 440, which is installed on the inner wall of the outer tube 410. The inner tube 411 is installed on the axial position of the inner wall of the gas storage box 440. A gas storage cavity is opened on the inner wall of the gas storage box 440, which stores sulfur hexafluoride gas. Both ends of the gas storage cavity are provided with through exhaust holes 441. A one-way valve is installed in the exhaust hole 441. The one-way valve controls the gas in the gas storage cavity to flow towards the middle outer tube 410, and delivers the sulfur hexafluoride gas in the gas storage cavity to the nozzle 320 for spraying. The sulfur hexafluoride gas reduces the oxygen content in the transformer body 100 by replacing oxygen, and the sulfur hexafluoride gas can extinguish the arc impact and prevent the arc from intensifying the combustion.

[0037] A second spring 451 is installed on the inner wall of the top of the gas storage tank 440. A pressure plate 450 is installed at the bottom of the second spring 451. The pressure plate 450 is slidably connected to the inner wall of the gas storage tank 440. Multiple second overflow grooves arranged in a circular pattern are opened in the pressure plate 450. A sealing rod 452 is fixedly connected to the bottom of the pressure plate 450. An electric actuator 461 is fixedly connected to the inner wall of the bottom of the gas storage tank 440. The control end of the electric actuator 461 is connected in series with the one-way valve in the same circuit. When the electric actuator 461 is started, it reciprocates and extends. A push plate 460 is fixedly connected to the top of the electric actuator 461. The push plate 460 has openings that are compatible with the sealing rod 452. When the one-way valve is opened, the electric actuator 461 reciprocates. As the electric actuator 461 rises, it moves the push plate 460 to the bottom of the pressure plate 450. The sealing rod 452 is inserted into the vent to seal it. The top gas is then discharged from the exhaust port 441 by the simultaneous upward movement of the push plate 460 and the pressure plate 450. When the electric actuator 461 descends, the sealing rod 452 moves out of the vent, and the bottom gas can then enter the top of the pressure plate 450 through the vent and the second overflow groove. The pressure plate 450 is reset under the elastic force of the second spring 451, thus circulating the bottom gas to be discharged from the top exhaust port 441.

[0038] Referring to Figure 6, the triggering assembly includes a trigger switch 324. A gas chamber is formed inside the plug 323. The trigger switch 324 is fixedly connected to the gas chamber on the side away from the fuse rod 340. The trigger switch 324 is electrically connected to the control circuit of the one-way valve, the fan 310, and the transformer body 100. A piston disc 343 and a limiting disc 344 are fixedly connected to the outer wall of the fuse rod 340. The piston disc 343 is slidably connected to the inner wall of the gas chamber. The limiting disc 344 is located outside the plug 323 and is used to limit the movement of the fuse rod 340. The gas chamber on the side of the piston disc 343 away from the trigger switch 324 is filled with inert gas. The inert gas expands at high temperature. When the fuse rod 340 melts, the tension on the piston disc 343 is released. The piston disc 343 is then squeezed by the inert gas and moves towards the trigger switch 324. The trigger switch 324 is triggered by the squeeze of the piston disc 343 to shut down the fan 310 and the transformer body 100 through an electrical signal, and to open the one-way valve through an electrical signal.

[0039] Referring to Figures 4, 7, and 8, multiple equidistant guide plates 420 are installed between two mounting brackets 400. The guide plates 420 have through holes. The outer tube 410 is installed on the inner wall of the through hole on the guide plate 420. The guide plates 420 can guide the incoming and outgoing airflow along the gap between the two guide plates 420, and can increase the contact time between the gas and the outer tube 410, increase the heat exchange time, and thus improve the cooling effect on the airflow.

[0040] The heat sink 300 has multiple second fixing holes arranged in a matrix on the side near the heat sink fins 200. A perforated plate 330 is fixedly connected to the inner wall of the second fixing holes. The perforated plate 330 is located in the gap between two adjacent heat sink fins 200. Multiple air holes 331 arranged in a circle are opened at one end of the perforated plate 330. A connecting groove is opened at the axis of the perforated plate 330. The connecting groove is connected to the air holes 331. An elastic block 332 is fixedly connected to the inner wall of the connecting groove. When the elastic block 332 is squeezed, it can deform and enter into the air hole 331 to seal the air hole 331 and prevent external gas from entering the heat sink 300.

[0041] The sealing assembly includes activated carbon 421. Multiple linearly arranged sliding grooves are formed within the guide plate 420. The activated carbon 421 is fixedly connected to the inner wall of the guide plate 420 near the transformer body 100. Water is adsorbed within the activated carbon 421. A piston plate 422 is slidably connected to the guide plate 420 near the orifice plate 330. A sliding rod 423 is fixedly connected to one end of the piston plate 422, and a pressing disc 424 is fixedly connected to the other end of the sliding rod 423. The pressing disc 424 is slidably connected to the inner wall of the connecting groove on the orifice plate 330 and contacts the elastic block 332. The high temperature within the transformer body 100 vaporizes the water adsorbed within the activated carbon 421, and the water vapor then presses against the piston plate 422. The piston plate 422, under pressure, presses against the elastic block 332 through the sliding rod 423 and the pressing disc 424.

[0042] Referring to Figure 12, multiple linearly arranged connecting columns 210 are installed at both ends of the outer wall of one side of the heat dissipation fin 200. A ribbon 211 is installed between two adjacent connecting columns 210. The ribbon 211 is made of flexible material. When the airflow passes over the heat dissipation fin 200, the ribbon 211 is blown back and forth by the airflow. The ribbon 211 contacts the wall surface of the heat dissipation fin 200 by swinging, which can remove the impurities stuck on the heat dissipation fin 200, keep the heat dissipation fin 200 clean, and prevent the impurities on the heat dissipation fin 200 from affecting the heat dissipation effect of the heat dissipation fin 200.

[0043] The working principle of this invention is as follows: When the transformer body 100 is in use, the fan 310 is turned on to guide the hot air inside the transformer body 100 through the air hole 331 on the heat dissipation box 300 to the heat dissipation fins 200. The heat dissipation fins 200 dissipate the hot air and replace the external air into the transformer body 100 through the air hole 331, thus completing the exchange of air inside the transformer body 100 and dissipating heat inside the transformer body 100. At the same time, the cooler 430 is turned on, and the cooler 430 sends coolant into the inner pipe 411. The coolant... The airflow flowing inside the inner tube 411 and entering the heat dissipation box 300 can exchange heat with the coolant inside the inner tube 411, cooling the airflow and further dissipating heat inside the transformer body 100. When a fire occurs inside the transformer body 100, the fuse rod 340 melts due to high temperature. Under the elastic force of the elastic block 332, it drives the plug 323 to move, releasing the blockage on the spray hole of the nozzle 320. The inert gas inside the plug 323 expands due to heat, squeezing the piston disc 343 to the trigger switch 324. The trigger switch 324 is squeezed and closes through an electrical signal. The circuits of fan 310 and transformer body 100 are closed, and the trigger switch 324 opens the one-way valve on exhaust port 441 via an electrical signal. The opening of the one-way valve activates the electric actuator 461 connected in series with it, causing it to reciprocate. The upward movement of the electric actuator 461 moves the push plate 460 and pressure plate 450 upwards, discharging sulfur hexafluoride gas from the exhaust port 441 at the top. When the electric actuator 461 moves downwards, the gas at the bottom is fed into the top through the vent on the push plate 460 and the second overflow groove on the pressure plate 450. This cycle continuously discharging sulfur hexafluoride gas from the top. The gas is discharged from the exhaust port 441 into the outer pipe 410 located in the middle. Then, the sulfur hexafluoride gas can be sprayed into the transformer body 100 through the spray hole of the nozzle 320 for fire extinguishing. At the same time, the water adsorbed in the activated carbon 421 is heated and evaporated into water vapor. The water vapor can squeeze the piston plate 422. The piston plate 422 squeezes the elastic block 332 through the sliding rod 423 and the compression plate 424. The elastic block 332 is squeezed and deformed and enters the air hole 331 to block the air hole 331, thus isolating the external gas from entering the heat dissipation box 300.

[0044] When used, this invention isolates the transformer body 100 from the outside by using flame-retardant and sealing components, preventing external oxygen from continuously entering the transformer body 100 and prolonging its combustion time. Furthermore, the spraying of sulfur hexafluoride gas replaces the oxygen, further reducing the oxygen content inside the transformer body 100 and affecting the fire extinguishing effect. Additionally, the sulfur hexafluoride gas can extinguish the arc by impacting it, preventing arc discharge from intensifying the combustion of the transformer body 100 and causing greater damage.

[0045] By using the fan 310 and cooling components, heat can be dissipated from the transformer body 100 through the combined action of air cooling and liquid cooling, thereby improving the heat dissipation effect of the transformer body 100 and preventing overheating and fire caused by the transformer body 100.

[0046] The push plate 460 and electric actuator 461 can continuously deliver sulfur hexafluoride gas into the nozzle 320 for spraying, improving the guidance and flow speed of the sulfur hexafluoride gas, and preventing the sulfur hexafluoride gas from failing to be delivered into the nozzle 320 for spraying in time, thus affecting the fire extinguishing effect.

[0047] The lightning rod 110 actively attracts lightning through the tip discharge effect, and conducts the lightning current to the ground through the neutral point of the low-voltage winding, thus preventing the transformer body 100 from being burned by lightning.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A power transformer with lightning protection function, comprising a transformer body (100), characterized in that, A lightning rod (110) is installed at the top center of the transformer body (100); heat dissipation components for auxiliary cooling are installed on both sides of the inner wall of the transformer body (100). The heat dissipation components include heat dissipation fins (200) and heat dissipation boxes (300). The heat dissipation boxes (300) are installed on both sides of the inner wall of the transformer body (100). The heat dissipation fins (200) are arranged linearly on the side of the heat dissipation box (300) away from the transformer body (100). A fan (310) for cooling by wind power is installed on one side of the heat dissipation box (300). A cooling component for cooling by liquid cooling is installed inside the heat dissipation box (300). A flame retardant component for fire extinguishing by gas spray is installed inside the cooling component. A sealing component for sealing the heat dissipation box (300) is also installed inside the cooling component. A triggering component for shutting down the fan (310) and the main circuit inside the transformer body (100) is installed inside the flame retardant component. The triggering component is activated by the temperature rise inside the transformer body (100).

2. A power transformer with lightning protection function according to claim 1, characterized in that, The cooling assembly includes an outer tube (410) and a cooler (430). The inner walls of the heat sink (300) are bolted to mounting brackets (400). There are multiple outer tubes (410), and each outer tube (410) is installed between two mounting brackets (400). Adjacent outer tubes (410) are connected by connecting pipes. An inner tube (411) is installed inside the outer tube (410). The cooler (430) is installed on one side of the mounting bracket (400) at the bottom. The two ends of the inner tube (411) are connected to the output end and the input end of the cooler (430), respectively.

3. A power transformer with lightning protection function according to claim 2, characterized in that, The flame-retardant assembly includes a nozzle (320), which is linearly arranged on the outer wall of an outer tube (410) located in the middle. The inner wall of the nozzle (320) has a through spray hole. A fixed plate (321) is installed on the side of the spray hole near the outer tube (410). A first spring (322) is fixedly connected to the axis of the fixed plate (321). A plug (323) is installed on the other end of the first spring (322). A fuse rod (340) is installed on the end of the plug (323) away from the fixed plate (321). A flow divider plate (342) is fixedly connected to the other end of the fuse rod (340). The flow divider plate (342) is snowflake-shaped. A connecting rod (341) is fixedly connected between the flow divider plate (342) and the nozzle (320).

4. A power transformer with lightning protection function according to claim 2, characterized in that, The flame-retardant component also includes a gas storage box (440), which is installed on the inner wall of the outer tube (410). The inner tube (411) is installed on the axial position of the inner wall of the gas storage box (440). A gas storage cavity is opened on the inner wall of the gas storage box (440), which stores sulfur hexafluoride gas. Both ends of the gas storage cavity are provided with through exhaust holes (441), and a one-way valve is installed in the exhaust hole (441).

5. A power transformer with lightning protection function according to claim 4, characterized in that, A second spring (451) is installed on the top inner wall of the gas storage tank (440). A pressure plate (450) is installed at the bottom end of the second spring (451). The pressure plate (450) is slidably connected to the inner wall of the gas storage tank (440). A sealing rod (452) is fixedly connected to the bottom end of the pressure plate (450). An electric push rod (461) is fixedly connected to the bottom inner wall of the gas storage tank (440). A push plate (460) is fixedly connected to the top end of the electric push rod (461). The push plate (460) has an air hole that matches the sealing rod (452).

6. A power transformer with lightning protection function according to claim 3, characterized in that, The triggering component includes a trigger switch (324), and an air chamber is provided inside the plug (323). The trigger switch (324) is fixedly connected to the side of the air chamber away from the fuse rod (340). The trigger switch (324) is electrically connected to the control circuit of the one-way valve, the fan (310), and the transformer body (100). A piston disc (343) is fixedly connected to the outer wall of the fuse rod (340). The piston disc (343) is slidably connected to the inner wall of the air chamber. The air chamber located on the side of the piston disc (343) away from the trigger switch (324) is filled with inert gas.

7. A power transformer with lightning protection function according to claim 2, characterized in that, A plurality of equally spaced guide plates (420) are installed between the two mounting brackets (400), and the outer tube (410) is installed on the inner wall of the guide plate (420).

8. A power transformer with lightning protection function according to claim 7, characterized in that, The heat sink (300) is fixedly connected to a perforated plate (330) on the side near the heat sink fins (200). One end of the perforated plate (330) has a plurality of air holes (331) arranged in a circle. A connecting groove is provided at the axial position of the perforated plate (330), and the connecting groove is connected to the air holes (331). An elastic block (332) is fixedly connected to the inner wall of the connecting groove.

9. A power transformer with lightning protection function according to claim 8, characterized in that, The sealing assembly includes activated carbon (421), which is fixedly connected to the inner wall of the guide plate (420) near the transformer body (100). The activated carbon (421) contains water. A piston plate (422) is slidably connected to the guide plate (420) near the orifice plate (330). A sliding rod (423) is fixedly connected to one end of the piston plate (422), and a pressing disc (424) is fixedly connected to the other end of the sliding rod (423). The pressing disc (424) is slidably connected to the inner wall of the connecting groove on the orifice plate (330) and is in contact with the elastic block (332).

10. A power transformer with lightning protection function according to claim 1, characterized in that, Multiple linearly arranged connecting columns (210) are installed on both ends of the outer wall of one side of the heat dissipation fin (200), and a ribbon (211) is installed between two adjacent connecting columns (210). The ribbon (211) is made of flexible material.

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