Transformer protection device and dry-type transformer

Abstract

The present invention discloses a transformer protection device and a dry-type transformer, belonging to the technical field of transformers. A transformer protection device includes a protection cabinet and a liquid storage tank; an upper partition is fixedly installed near the top of the protection cabinet, and a lower partition is fixedly installed near the bottom of the protection cabinet, and a closed chamber is provided between the lower partition and the upper partition. The present invention fixes the transformer in the closed chamber inside the protection cabinet, and then diffuses an anti-oxidation mist into the closed chamber to create an anti-rust and anti-corrosion environment to protect the transformer, so that the transformer will not be corroded in any harsh environment encountered during export transportation, and can avoid collision damage, thereby ensuring the performance and service life of the exported dry-type transformer; the dry-type transformer of the present invention can be operated and used in harsh environments, eliminating the constraints of the external environment on the use of the dry-type transformer, and greatly enhancing the applicability of the dry-type transformer.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformers, and in particular relates to a transformer protection device and a dry-type transformer. Background Art

[0002] A dry-type transformer is a type of transformer that does not require oil as a dielectric medium. Its structure is relatively simple, typically consisting of an iron core, coils, and other basic components. Compared to traditional transformers, dry-type transformers offer higher efficiency and capacity, making them increasingly popular in industrial and commercial sectors, particularly in power transmission and distribution systems.

[0003] In recent years, my country's export volume of dry-type transformers has increased dramatically. During sea transportation, these exported dry-type transformers are subject to harsh environmental conditions such as high humidity and high salt density (the transport temperature of dry-type transformers should be controlled between -25°C and 40°C, and the transport humidity should be controlled between 30% and 80%, neither too high nor too low). These factors can cause corrosion of the transformer casing and internal components. Specifically, the marine atmosphere contains a large amount of chloride ions, which are highly conductive and easily form micro- and macro-cells on metal surfaces. This increases corrosion activity, destroys the passivation film on the metal surface, and accelerates the aging of insulation materials. This leads to accelerated corrosion rates and performance degradation of various materials, seriously affecting the service life of exported dry-type transformers.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a transformer protection device and a dry-type transformer.

[0005] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide a transformer protection device and a dry-type transformer, which can solve the problem that exported dry-type transformers are affected by harsh environments such as high humidity and high salt density during sea transportation, resulting in corrosion of the transformer casing and internal structural parts, seriously affecting the service life of the exported dry-type transformers.

[0007] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions:

[0008] A transformer protection device includes a protection cabinet and a liquid storage tank;

[0009] An upper partition is fixedly installed near the top of the protective cabinet, and a lower partition is fixedly installed near the bottom of the protective cabinet. A closed chamber is defined between the lower and upper partitions, and the transformer is fixedly installed inside the closed chamber.

[0010] A lower chamber is provided below the lower partition, and an upper chamber is provided above the upper partition;

[0011] The liquid storage tank is fixedly installed on the outside of the protective cabinet, and antioxidants are stored in the liquid storage tank. A flow valve is fixedly installed in the lower chamber, and a liquid supply pipe is fixedly installed between the liquid storage tank and the flow valve. A solenoid valve and a liquid pump are fixedly installed on the liquid supply pipe.

[0012] The lower partition is provided with a plurality of diffusion holes, and the interior of the lower chamber is connected with the interior of the closed chamber through the plurality of diffusion holes;

[0013] A shunt box is fixedly mounted on the lower end surface of the lower partition, a fan is fixedly mounted on the shunt box, a cooling air path is provided on the transformer, the interior of the shunt box is connected to one end of the cooling air path, an air equalization box is fixedly mounted on the upper end surface of the upper partition, the interior of the air equalization box is connected to the other end of the cooling air path, and a plurality of through holes are opened on the upper end surface of the air equalization box;

[0014] A second fin is fixedly mounted inside the upper chamber, a secondary heat exchange assembly is mounted on the liquid storage tank, an air return box is fixedly mounted on the second fin, and the secondary heat exchange assembly is connected to the air return box;

[0015] An automatic air return switching structure is provided inside the air return box.

[0016] In one or more embodiments of the present invention, the antioxidant comprises a corrosion inhibitor, an anti-rust powder, an organic solvent, and a retaining agent;

[0017] The corrosion inhibitor is polyglycerol oleic acid, the rust-proof powder is red lead powder, the organic solvent is isopropyl alcohol, and the retaining agent is diethylene glycol monomethyl ether;

[0018] The components are mixed by weight to form 12-15 g / L of polyglycerol oleic acid, 21-30 g / L of red lead powder, 900-950 g / L of isopropyl alcohol, and 16-20 g / L of diethylene glycol monomethyl ether.

[0019] In one or more embodiments of the present invention, the automatic air return switching structure includes a C-shaped frame, which is slidably mounted inside an air return box. A return air port is provided on one side of the air return box. An upper outlet and a lower outlet are respectively provided on the upper and lower end surfaces of the air return box. A first opening and a second opening are respectively provided on the upper and lower end surfaces of the C-shaped frame. The upper outlet and the lower outlet match the first opening and the second opening, respectively.

[0020] A heat conducting pipe is fixedly mounted on the second fin, one end of the heat conducting pipe passes through the interior of the air return box from the opposite side of the air return port and is fixedly mounted with an air bag;

[0021] A spring is fixedly installed between one side of the C-shaped frame and the inner wall of the air return box.

[0022] In one or more embodiments of the present invention, a first air return pipe is fixedly mounted on the lower outlet, and one end of the first air return pipe away from the air return box is in communication with the interior of the closed chamber;

[0023] A first one-way valve is fixedly installed on the first air return pipe.

[0024] In one or more embodiments of the present invention, the secondary heat exchange assembly includes a second air return pipe, one end of the second air return pipe is fixedly mounted on the upper outlet, an air distribution pipe is fixedly mounted on the end of the second air return pipe away from the air return box, multiple groups of heat exchange pipes are fixedly mounted on the air distribution pipe, the multiple groups of heat exchange pipes pass through the interior of the liquid storage tank and are fixedly mounted with an air collecting pipe;

[0025] A connecting pipe is fixedly mounted on the gas collecting pipe, and one end of the connecting pipe away from the gas collecting pipe is connected to the interior of the closed chamber;

[0026] A second one-way valve is fixedly installed on the connecting pipe;

[0027] A first fin is fixedly mounted on the liquid storage tank.

[0028] In one or more embodiments of the present invention, a rotary cover and a second automatic pressure relief valve are fixedly mounted on the liquid storage tank;

[0029] A first automatic pressure relief valve is fixedly installed on the protective cabinet, and the first automatic pressure relief valve matches the closed chamber;

[0030] The front end of the protective cabinet is provided with double doors.

[0031] In one or more embodiments of the present invention, a guide pipe is fixedly mounted on the flow valve, and a plurality of diffuser holes are provided on the guide pipe.

[0032] In one or more embodiments of the present invention, a monitoring mechanism is fixedly installed inside the closed chamber, and the monitoring mechanism includes a temperature sensor and an aerosol concentration sensor.

[0033] In one or more embodiments of the present invention, a dry-type transformer includes a dry-type transformer body, wherein the dry-type transformer body includes an iron core, wherein clamps are fixedly mounted on the upper and lower ends of the iron core, and a coil assembly is sleeved on the outside of the iron core;

[0034] The coil assembly includes a high-voltage coil and a low-voltage coil. The low-voltage coil is sleeved on the outside of the iron core, and the high-voltage coil is sleeved on the outside of the low-voltage coil. The cooling air path is arranged between the high-voltage coil and the low-voltage coil.

[0035] In one or more embodiments of the present invention, the cooling air path includes a cooling air duct, the cooling air duct is located between the outer wall of the low-voltage coil and the inner wall of the high-voltage coil, and the upper and lower ends of the high-voltage coil and the low-voltage coil are respectively fixedly mounted with an upper closing cover and a lower closing cover;

[0036] The upper closing cover is fixedly mounted with a plurality of upper fixed tubes, one end of the plurality of upper fixed tubes away from the upper closing cover is fixedly mounted on the upper partition, and the interior of the gas equalization box is connected to the interior of the cooling air duct through the plurality of upper fixed tubes;

[0037] The lower closing cover is fixedly mounted with multiple sets of lower fixed tubes, one end of the multiple sets of lower fixed tubes away from the lower closing cover is fixedly mounted on the lower partition, and the interior of the diverter box is connected to the interior of the cooling air duct through the multiple sets of lower fixed tubes.

[0038] Compared with the existing technology, the present invention fixes the transformer in a closed chamber inside a protective cabinet and then diffuses antioxidant mist into the closed chamber to create an anti-rust and anti-corrosion environment to protect the transformer. This prevents the transformer from being corroded in harsh environments during transportation and avoids collision damage, thereby ensuring the performance and service life of the exported dry-type transformer.

[0039] The dry-type transformer of the present invention can operate normally in a closed chamber and has good heat dissipation during operation, so that the dry-type transformer can be operated and used in harsh environments, eliminating the constraints of the external environment on the use of the dry-type transformer and greatly enhancing the applicability of the dry-type transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 The structure of a transformer protection device in one embodiment of the present invention is Figure 1 ;

[0042] Figure 2 A cross-sectional view of a transformer protection device and a dry-type transformer in one embodiment of the present invention Figure 1 ;

[0043] Figure 3 A cross-sectional view of a transformer protection device and a dry-type transformer in one embodiment of the present invention Figure 2 ;

[0044] Figure 4 An exploded view of a coil assembly of a dry-type transformer according to an embodiment of the present invention;

[0045] Figure 5 The structure of a transformer protection device in one embodiment of the present invention is Figure 2 ;

[0046] Figure 6 It is a front cross-sectional view of a transformer protection device and a dry-type transformer in one embodiment of the present invention;

[0047] Figure 7 In one embodiment of the present invention Figure 1 Enlarged view of point A in the middle;

[0048] Figure 8 In one embodiment of the present invention Figure 3 Enlarged view of point B in the middle;

[0049] Figure 9 A cross-sectional view of an air return box of a transformer protection device according to an embodiment of the present invention;

[0050] Figure 10 This is an enlarged view of a monitoring mechanism of a transformer protection device in one embodiment of the present invention.

[0051] Description of main reference numerals:

[0052] 10. Protective cabinet; 11. Double doors; 12. Top plate; 13. Lower partition; 131. Diffuser hole; 14. Lower chamber; 141. Diverter box; 142. Fan; 15. Upper partition; 16. Upper chamber; 161. Gas equalization box; 1611. Through hole; 17. First automatic pressure relief valve; 20. Liquid storage tank; 21. Screw cap; 22. Second automatic pressure relief valve; 23. First fin; 24. Liquid supply pipe; 241. Solenoid valve; 25. Liquid pump; 26. Flow valve; 27. Guide pipe; 271. Diffuser hole; 30. Dry-type transformer body; 31. Iron core; 32. Clamp; 33. Coil assembly; 331. High-voltage coil; 332. Low-voltage coil; 333. 3. Cooling air duct; 334. Upper closing cover; 335. Lower closing cover; 34. Upper fixed tube; 35. Lower fixed tube; 40. Second fin; 50. Return air box; 501. Return air port; 502. C-shaped frame; 5021. First opening; 5022. Second opening; 503. Lower outlet; 504. Upper outlet; 505. Spring; 51. First return air pipe; 511. First one-way valve; 52. Second return air pipe; 53. Heat transfer pipe; 531. Air bag; 54. Air distribution pipe; 55. Heat exchange pipe; 56. Air collecting pipe; 561. Connecting pipe; 562. Second one-way valve; 60. Monitoring mechanism; 61. Temperature sensor; 62. Aerosol concentration sensor. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0054] like Figures 1-10 As shown, a transformer protection device according to one embodiment of the present invention includes a protection cabinet 10 and a liquid storage tank 20. An upper partition 15 is fixedly mounted near the top of the protection cabinet 10, and a lower partition 13 is fixedly mounted near the bottom of the protection cabinet 10. A closed chamber is defined between the lower partition 13 and the upper partition 15. The transformer is fixedly mounted within the closed chamber, and a double door 11 is provided at the front end of the closed chamber to facilitate regular inspection and maintenance of the transformer within.

[0055] like Figure 2 As shown, the above-mentioned transformer is a dry-type transformer, which includes a dry-type transformer body 30. The dry-type transformer body 30 includes an iron core 31. The upper and lower ends of the iron core 31 are respectively fixedly installed with clamps 32, wherein the clamp 32 at the upper end of the iron core 31 is also installed with a high-voltage terminal, a low-voltage outlet copper bus and a lifting ring.

[0056] like Figure 4 As shown, a coil assembly 33 is sleeved on the outside of the iron core 31. The coil assembly 33 includes a high-voltage coil 331 and a low-voltage coil 332. The low-voltage coil 332 is sleeved on the outside of the iron core 31, and the high-voltage coil 331 is sleeved on the outside of the low-voltage coil 332. A cooling air path is provided between the high-voltage coil 331 and the low-voltage coil 332 for ventilation and heat dissipation inside the dry-type transformer.

[0057] The cooling air circuit includes a cooling air duct 333 located between the outer wall of the low-voltage coil 332 and the inner wall of the high-voltage coil 331. An upper sealing cover 334 and a lower sealing cover 335 are fixedly mounted at the upper and lower ends of the high-voltage coil 331 and the low-voltage coil 332, respectively. These upper and lower sealing covers 334 and 335 seal the cooling air duct 333 to conduct heat in a targeted manner, preventing it from directly diffusing into the enclosed chamber and maintaining a constant temperature within the chamber. This also prevents contamination and the ingress of debris into the cooling air duct 333, ensuring the safe operation of the dry-type transformer.

[0058] Multiple sets of upper fixing tubes 34 are fixedly mounted on the upper closure cover 334. The ends of the multiple sets of upper fixing tubes 34, which are remote from the upper closure cover 334, are fixedly mounted on the upper partition 15. The upper end of the dry-type transformer is secured by the multiple sets of upper fixing tubes 34. Multiple sets of lower fixing tubes 35 are fixedly mounted on the lower closure cover 335. The ends of the multiple sets of lower fixing tubes 35, which are remote from the lower closure cover 335, are fixedly mounted on the lower partition 13. The lower end of the dry-type transformer is secured by the multiple sets of lower fixing tubes 35. This method completely secures the dry-type transformer within the enclosed chamber, effectively protecting it from damage caused by collision or vibration during transportation.

[0059] like Figure 2 and Figure 3 As shown, a lower chamber 14 is provided below the lower partition 13 , and a plurality of diffusion holes 131 are provided on the lower partition 13 . The interior of the lower chamber 14 is communicated with the interior of the closed chamber through the plurality of diffusion holes 131 .

[0060] The liquid storage tank 20 is fixedly mounted on the outside of the protective cabinet 10, and an antioxidant is stored in the liquid storage tank 20. The components of the antioxidant include corrosion inhibitor, anti-rust powder, organic solvent and retaining agent. The corrosion inhibitor is polyglycerol oleic acid, which can form a dense protective film on the metal surface to isolate the corrosive medium from direct contact with the metal. Thereby achieving the effect of rust and corrosion prevention. The anti-rust powder is red lead powder, which has excellent gasification and diffusion properties, so that it can evaporate in a volatile solvent to form an anti-corrosion aerosol. The organic solvent is isopropyl alcohol, which is colorless and volatile and can be mixed with red lead powder to form an antioxidant solution. The retaining agent is diethylene glycol monomethyl ether, and its main function is to stabilize the anti-corrosion aerosol so that the anti-corrosion aerosol can continue to work.

[0061] Specifically, an antioxidant is prepared according to the following weight ratio: 15 g / L polyglycerol oleic acid, 25 g / L red lead powder, 940 g / L isopropyl alcohol, and 20 g / L diethylene glycol monomethyl ether. After thorough mixing, the antioxidant is obtained. The antioxidant has excellent anti-corrosion and anti-rust properties, is easily volatile, and forms an antioxidant mist that can persist for a certain period of time.

[0062] like Figure 1 、 Figure 2 Combine Figure 5 As shown, a flow valve 26 is fixedly installed inside the lower chamber 14, and a liquid supply pipe 24 is fixedly installed between the liquid storage tank 20 and the flow valve 26. A solenoid valve 241 and a liquid pump 25 are fixedly installed on the liquid supply pipe 24. The solenoid valve 241 is used to control the on-off of the liquid supply pipe 24. The liquid pump 25 can extract the antioxidant from the liquid storage tank 20 and transfer it to the flow valve 26 through the liquid supply pipe 24. The flow valve 26 can control the flow of the antioxidant.

[0063] A guide pipe 27 is fixedly mounted on one side of the flow valve 26 , and a plurality of diffuser holes 271 are formed on the guide pipe 27 . The antioxidant can be uniformly sprayed into the interior of the lower chamber 14 through the diffuser holes 271 .

[0064] Specifically, by evenly spraying the antioxidant into the lower chamber 14, the antioxidant slowly evaporates inside the lower chamber 14 to continuously form an antioxidant mist. At this time, the antioxidant mist will diffuse upward to the inside of the closed chamber through the plurality of diffusion holes 131, so that an anti-rust and anti-corrosion environment is formed inside the closed chamber, so that the dry-type transformer inside is placed in this environment. At this time, no matter what the transportation environment is, it can be ensured that the dry-type transformer will not be damaged, so that the exported dry-type transformer can be safely transported to ensure its performance and service life.

[0065] It is worth noting that, since the antioxidant mist contains polyglycerol oleic acid as a corrosion inhibitor, it can also form a protective film on the surface of the dry-type transformer and the inner wall of the protective cabinet 10, forming double protection, which is safer and more reliable to use.

[0066] Even more noteworthy is that by surrounding the dry-type transformer with an antioxidant mist, it can operate normally in special environments, such as those susceptible to rain, moisture, high temperature, high heat, or direct sunlight, as well as locations exposed to corrosive liquids, gases, dust, conductive fibers, or metal shavings. This dry-type transformer can overcome the limitations of these harsh environments and significantly extend its service life.

[0067] like Figure 3 Combine Figure 4 As shown, as shown, since the dry-type transformer is in a closed chamber filled with antioxidant mist, it faces serious heat dissipation problems during operation. For this reason, a diverter box 141 is fixedly installed on the lower end surface of the lower partition 13, and a fan 142 is fixedly installed on the diverter box 141. The interior of the diverter box 141 is connected to the interior of the cooling air duct 333 through the lower fixed tube 35. By starting the fan 142, the air in the closed chamber can be extracted and sent into the interior of the cooling air duct 333 through the diverter box 141 and the lower fixed tube 35.

[0068] like Figure 2 and Figure 3 As shown, an upper chamber 16 is provided above the upper partition 15. An air equalization box 161 is fixedly mounted on the upper end surface of the upper partition 15. The interior of the air equalization box 161 is connected to the interior of the cooling air duct 333 via the upper fixed tube 34. Air entering the cooling air duct 333 can enter the air equalization box 161 through the upper fixed tube 34. A plurality of through holes 1611 are formed on the upper end surface of the air equalization box 161, and the air is eventually discharged through the plurality of through holes 1611.

[0069] A second fin 40 is fixedly mounted within the upper chamber 16, located directly above the air equalization box 161. One end of the second fin 40 is located within the upper chamber 16, while the other end is exposed to the outside air. Air exhausted through the plurality of through-holes 1611 is blown onto the surface of the second fin 40, exchanging heat and cooling the air through the second fin 40.

[0070] A top plate 12 is fixedly mounted above the protective cabinet 10 , and the top plate 12 can shield the second fins 40 to prevent them from being exposed to direct sunlight and causing their own temperature to be too high, thereby ensuring their heat exchange effect.

[0071] Specifically, a temperature probe is installed inside the cooling air duct 333 to monitor its internal temperature. When the temperature inside the cooling air duct 333 is too high during the operation of the dry-type transformer, the fan 142 is started to extract air from the closed chamber and send it into the cooling air duct 333. The air enters the cooling air duct 333 and flows upward to take away heat. It is finally blown to the surface of the second fin 40 through a number of through holes 1611, and heat is exchanged with the air through the second fin 40 to cool the air.

[0072] like Figure 3 and Figure 8 As shown, an air return box 50 is fixedly mounted on the second fin 40, an air return port 501 is provided on one side of the air return box 50, and a first air return pipe 51 is fixedly mounted on the bottom end of the air return box 50. The first air return pipe 51 is communicated with the interior of the closed chamber. The air after heat exchange and cooling with the second fin 40 can enter the interior of the air return box 50 through the air return port 501, and then flow back to the interior of the closed chamber through the first air return pipe 51, thereby realizing circulating heat dissipation.

[0073] Among them, such as Figure 6 As shown, a first one-way valve 511 is fixedly installed on the first return air pipe 51. The first one-way valve 511 allows air to flow back from the return air box 50 to the closed chamber, while the air in the closed chamber cannot enter the interior of the return air box 50 through the first return air pipe 51.

[0074] It is worth noting that during the heat dissipation process, when the air containing antioxidant mist enters the cooling air duct 333, it can also provide antioxidant protection for the high-voltage coil 331 and the low-voltage coil 332, preventing their aging and resulting degradation of insulation performance, thereby ensuring the safe operation of the dry-type transformer.

[0075] Since the second fins 40 have limited heat exchange and cooling effects on the air, in order to ensure good heat dissipation, a secondary heat exchange component is also installed on the liquid storage tank 20. If the heat exchange through the second fins 40 cannot meet the heat dissipation requirements, the secondary heat exchange component can be used to efficiently cool the air for a second time.

[0076] like Figure 8 and Figure 9 As shown, the return air box 50 is provided with an automatic return air switching structure, which includes a C-shaped frame 502, which is slidably mounted inside the return air box 50. The upper and lower end surfaces of the return air box 50 are respectively provided with an upper outlet 504 and a lower outlet 503. One end of the first return air pipe 51 is fixedly mounted on the lower outlet 503, and the upper outlet 504 is connected to the secondary heat exchange component. The upper and lower end surfaces of the C-shaped frame 502 are respectively provided with a first opening 5021 and a second opening 5022. In the initial state, the lower outlet 503 and the second opening 5022 are in an overlapping state, and the upper outlet 504 and the first opening 5021 are in a misaligned state. At this time, air can only enter the first return air pipe 51 through the second opening 5022 and the lower outlet 503, and directly flow back into the closed chamber.

[0077] A heat pipe 53 is fixedly mounted on the second fin 40. One end of the heat pipe 53 extends from the opposite side of the return air port 501 into the interior of the return air box 50 and is fixedly mounted with an air bag 531. When the second fin 40 cannot meet the heat dissipation requirements, its own temperature will continue to rise. At this time, the second fin 40 will transfer heat to the heat pipe 53, causing the temperature of the heat pipe 53 to continue to rise. According to the principle of thermal expansion and contraction, the internal pressure of the heat pipe 53 will continue to rise, causing the air bag 531 to expand. The expansion of the air bag 531 will push the C-shaped frame 502 to slide, causing the second opening 5022 to be misaligned with the lower outlet 503, and the first opening 5021 to coincide with the upper outlet 504. At this time, the air that has exchanged heat with the second fin 40 cannot enter the interior of the first return air pipe 51, but instead enters the secondary heat exchange component through the first opening 5021 and the upper outlet 504 for further heat exchange and cooling.

[0078] A spring 505 is fixedly installed between one side of the C-shaped frame 502 and the inner wall of the air return box 50. The spring 505 enables the C-shaped frame 502 to slide elastically, making the structure more stable and reliable.

[0079] like Figure 5 and Figure 6 As shown, the secondary heat exchange assembly includes a second return air pipe 52, one end of which is fixedly mounted on the upper outlet 504. Air that requires further heat exchange and cooling can be discharged through the second return air pipe 52. A splitter pipe 54 is fixedly mounted on the end of the second return air pipe 52 away from the return air box 50. Multiple sets of heat exchange tubes 55 are fixedly mounted on the splitter pipe 54. These multiple sets of heat exchange tubes 55 extend through the interior of the liquid storage tank 20 and are fixedly mounted with a collecting pipe 56. During secondary heat exchange and cooling, air flows evenly through the splitter pipe 54 into the multiple sets of heat exchange tubes 55. As it flows downward within the multiple sets of heat exchange tubes 55, it exchanges heat with the antioxidant inside the liquid storage tank 20, utilizing the antioxidant for secondary heat exchange and cooling, resulting in high efficiency.

[0080] like Figure 7 As shown, a connecting pipe 561 is fixedly installed on the air collecting pipe 56, and the end of the connecting pipe 561 away from the air collecting pipe 56 is connected to the interior of the closed chamber. The air after secondary heat exchange and cooling will first be collected inside the air collecting pipe 56, and then flow back to the interior of the closed chamber through the connecting pipe 561.

[0081] A second one-way valve 562 is fixedly installed on the connecting pipe 561 , and the air can only enter the closed chamber through the air collecting pipe 56 through the second one-way valve 562 , and the air in the closed chamber will not flow out through the connecting pipe 561 .

[0082] In addition, a first fin 23 is fixedly installed on the liquid storage tank 20. One end of the first fin 23 is located inside the liquid storage tank 20, and the other end is exposed to the outside air. It can perform heat exchange and cooling on the antioxidant to prevent the temperature of the antioxidant from continuing to rise, while allowing the antioxidant to continue to perform heat exchange and cooling.

[0083] Specifically, if the cooling demand cannot be met by the second fin 40, the temperature of the second fin 40 will continue to rise. At this time, the temperature of the heat conduction tube 53 itself will rise, and the internal air pressure will also rise accordingly, causing the air bag 531 to expand, thereby pushing the C-shaped frame 502 to slide, so that the second opening 5022 is misaligned with the lower outlet 503, and the first opening 5021 coincides with the upper outlet 504. At this time, the air will not directly flow back to the interior of the closed chamber, but will be introduced into the interior of the air distribution pipe 54 through the second return air pipe 52, and then flow downward evenly through multiple groups of heat exchange tubes 55. Since the heat exchange tubes 55 are immersed in antioxidants, the air can fully exchange heat with the antioxidants during the downward flow, thereby obtaining secondary heat exchange and cooling. Finally, it flows back to the closed chamber through the collecting pipe 56 and the connecting pipe 561, and the cycle is repeated.

[0084] It is worth noting that during the process of air circulation and cooling in the closed chamber, it always flows in a closed loop and will not leak out, which not only prevents the loss of antioxidant mist but also protects the external environment.

[0085] The liquid storage tank 20 is also fixedly mounted with a screw cap 21 and a second automatic pressure relief valve 22. The screw cap 21 can be opened to facilitate the addition of antioxidants. The second automatic pressure relief valve 22 can automatically relieve pressure inside the liquid storage tank 20 to prevent the internal pressure of the liquid storage tank 20 from continuing to increase due to the increase in the temperature of the antioxidant.

[0086] In addition, a first automatic pressure relief valve 17 is fixedly installed on the protective cabinet 10. The first automatic pressure relief valve 17 can automatically relieve pressure inside the closed chamber to prevent the closed chamber from exploding due to excessive pressure inside the chamber.

[0087] In addition, if Figure 3 and Figure 10 As shown, a monitoring mechanism 60 is fixedly installed inside the enclosed chamber. The monitoring mechanism 60 includes a temperature sensor 61 and an aerosol concentration sensor 62. The temperature sensor 61 is used to monitor the temperature within the enclosed chamber. When the temperature within the enclosed chamber is too high, the fan 142 is automatically activated to reduce the temperature. The aerosol concentration sensor 62 is used to monitor the concentration of the antioxidant aerosol in the enclosed chamber in real time. When the aerosol concentration is too low, the liquid pump 25 is activated to automatically spray the antioxidant into the lower chamber 14.

[0088] During use, the dry-type transformer is fixedly installed in the closed chamber through multiple groups of upper fixed tubes 34 and multiple groups of lower fixed tubes 35, and then the liquid pump 25 is started to extract the antioxidant inside the liquid storage tank 20, and then the antioxidant is evenly sprayed inside the lower chamber 14 through a plurality of diffuser holes 271, so that the antioxidant slowly evaporates inside the lower chamber 14 and continuously forms antioxidant mist. At this time, the antioxidant mist will diffuse upward to the inside of the closed chamber through a plurality of diffusion holes 131, so that the inside of the closed chamber forms an anti-rust and anti-corrosion environment, so that the dry-type transformer inside is in this environment. At this time, no matter what the transportation environment is, it can be ensured that the dry-type transformer will not be damaged, so that the exported dry-type transformer can be safely transported to ensure its performance and service life.

[0089] The dry-type transformer can also operate in a closed chamber. When heat dissipation is required during operation, the fan 142 can be started to extract air from the closed chamber and send it into the cooling air duct 333. The air enters the cooling air duct 333 and flows upward to take away the heat. Finally, it is blown to the surface of the second fin 40 through a number of through holes 1611, and the air is cooled by exchanging heat with the air through the second fin 40. If the heat exchange and cooling requirements cannot be met by the second fin 40, the temperature of the second fin 40 will continue to rise. At this time, the temperature of the heat conduction tube 53 itself will rise, and the internal air pressure will also rise accordingly, causing the air bag 531 to expand, thereby pushing the C-shaped frame 502 to slide, so that the second opening 5022 is misaligned with the lower outlet 503, and the first opening 5021 coincides with the upper outlet 504. At this time, the air will not directly return to the closed chamber, but will be introduced into the air distribution pipe 54 through the second return air pipe 52, and then flow downward evenly through multiple groups of heat exchange tubes 55. Since the heat exchange tubes 55 are immersed in antioxidants, the air can fully exchange heat with the antioxidants during the downward flow, thereby obtaining secondary heat exchange and cooling. Finally, it flows back to the closed chamber through the collecting pipe 56 and the connecting pipe 561, and the cycle is repeated.

[0090] The present invention fixes the transformer in a closed chamber inside the protective cabinet 10 and diffuses an antioxidant mist into the closed chamber to create an anti-rust and anti-corrosion environment to protect the transformer. This prevents the transformer from being corroded in harsh environments during transportation and avoids collision damage, thereby ensuring the performance and service life of the exported dry-type transformer.

[0091] The dry-type transformer of the present invention can operate normally in a closed chamber and has good heat dissipation during operation, so that the dry-type transformer can be operated and used in harsh environments, eliminating the constraints of the external environment on the use of the dry-type transformer and greatly enhancing the applicability of the dry-type transformer.

[0092] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0093] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A transformer protection device, characterized in that: include: A protective cabinet, wherein an upper partition is fixedly installed near the top of the protective cabinet, a lower partition is fixedly installed near the bottom of the protective cabinet, a closed chamber is defined between the lower partition and the upper partition, and the transformer is fixedly installed inside the closed chamber; A lower chamber is provided below the lower partition, and an upper chamber is provided above the upper partition; A liquid storage tank, the liquid storage tank is fixedly installed on the outside of the protective cabinet, the liquid storage tank stores antioxidants, a flow valve is fixedly installed inside the lower chamber, a liquid supply pipe is fixedly installed between the liquid storage tank and the flow valve, and a solenoid valve and a liquid pump are fixedly installed on the liquid supply pipe; The lower partition is provided with a plurality of diffusion holes, and the interior of the lower chamber is connected with the interior of the closed chamber through the plurality of diffusion holes; A shunt box is fixedly mounted on the lower end surface of the lower partition, a fan is fixedly mounted on the shunt box, a cooling air path is provided on the transformer, the interior of the shunt box is connected to one end of the cooling air path, an air equalization box is fixedly mounted on the upper end surface of the upper partition, the interior of the air equalization box is connected to the other end of the cooling air path, and a plurality of through holes are opened on the upper end surface of the air equalization box; A second fin is fixedly mounted inside the upper chamber, a secondary heat exchange assembly is mounted on the liquid storage tank, an air return box is fixedly mounted on the second fin, and the secondary heat exchange assembly is connected to the air return box; The air return box is provided with an automatic air return switching structure; The automatic air return switching structure includes a C-shaped frame, which is slidably mounted inside the air return box. A return air port is provided on one side of the air return box. An upper outlet and a lower outlet are respectively provided on the upper and lower end surfaces of the air return box. A first opening and a second opening are respectively provided on the upper and lower end surfaces of the C-shaped frame. The upper outlet and the lower outlet match the first opening and the second opening, respectively. A heat conducting pipe is fixedly mounted on the second fin, one end of the heat conducting pipe passes through the interior of the air return box from the opposite side of the air return port and is fixedly mounted with an air bag; A spring is fixedly installed between one side of the C-shaped frame and the inner wall of the air return box.

2. A transformer protection device according to claim 1, characterized in that: The antioxidant comprises corrosion inhibitor, rust-proof powder, organic solvent and retaining agent; The corrosion inhibitor is polyglycerol oleic acid, the rust-proof powder is red lead powder, the organic solvent is isopropyl alcohol, and the retaining agent is diethylene glycol monomethyl ether; The components are mixed by weight to form 12-15 g / L of polyglycerol oleic acid, 21-30 g / L of red lead powder, 900-950 g / L of isopropyl alcohol, and 16-20 g / L of diethylene glycol monomethyl ether.

3. A transformer protection device according to claim 1, characterized in that: A first air return pipe is fixedly mounted on the lower outlet, and one end of the first air return pipe away from the air return box is in communication with the interior of the closed chamber; A first one-way valve is fixedly installed on the first air return pipe.

4. A transformer protection device according to claim 3, characterized in that: The secondary heat exchange assembly includes a second air return pipe, one end of which is fixedly mounted on the upper outlet, an air distribution pipe is fixedly mounted on the end of the second air return pipe away from the air return box, and multiple groups of heat exchange pipes are fixedly mounted on the air distribution pipe, and the multiple groups of heat exchange pipes pass through the interior of the liquid storage tank and are fixedly mounted with an air collecting pipe; A connecting pipe is fixedly mounted on the gas collecting pipe, and one end of the connecting pipe away from the gas collecting pipe is connected to the interior of the closed chamber; A second one-way valve is fixedly installed on the connecting pipe; A first fin is fixedly mounted on the liquid storage tank.

5. A transformer protection device according to claim 4, characterized in that: The liquid storage tank is fixedly mounted with a rotary cover and a second automatic pressure relief valve; A first automatic pressure relief valve is fixedly installed on the protective cabinet, and the first automatic pressure relief valve matches the closed chamber; The front end of the protective cabinet is provided with double doors.

6. A transformer protection device according to claim 1, characterized in that: A guide pipe is fixedly installed on the flow valve, and a plurality of diffuser holes are opened on the guide pipe.

7. The transformer protection device according to claim 1, characterized in that: A monitoring mechanism is fixedly installed inside the closed chamber, and the monitoring mechanism includes a temperature sensor and an aerosol concentration sensor.

8. Dry-type transformer, characterized in that, The transformer protection device comprises a dry-type transformer body according to any one of claims 1 to 7, wherein the dry-type transformer body comprises an iron core, wherein clamps are fixedly mounted on the upper and lower ends of the iron core, and a coil assembly is sleeved on the outside of the iron core; The coil assembly includes a high-voltage coil and a low-voltage coil. The low-voltage coil is sleeved on the outside of the iron core, and the high-voltage coil is sleeved on the outside of the low-voltage coil. The cooling air path is arranged between the high-voltage coil and the low-voltage coil.

9. The dry-type transformer according to claim 8, characterized in that: The cooling air circuit includes a cooling air duct, which is located between the outer wall of the low-voltage coil and the inner wall of the high-voltage coil. The upper and lower ends of the high-voltage coil and the low-voltage coil are respectively fixedly mounted with an upper closing cover and a lower closing cover; The upper closing cover is fixedly mounted with a plurality of upper fixed tubes, one end of the plurality of upper fixed tubes away from the upper closing cover is fixedly mounted on the upper partition, and the interior of the gas equalization box is connected to the interior of the cooling air duct through the plurality of upper fixed tubes; The lower closing cover is fixedly mounted with multiple sets of lower fixed tubes, one end of the multiple sets of lower fixed tubes away from the lower closing cover is fixedly mounted on the lower partition, and the interior of the diverter box is connected to the interior of the cooling air duct through the multiple sets of lower fixed tubes.

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