Transformer protection device and dry-type transformer

Abstract

The invention discloses a transformer protection device and a dry-type transformer, and belongs to the technical field of transformers. The transformer protection device comprises a protection cabinet and a liquid storage tank; an upper partition plate is fixedly installed at the position, close to the top end, in the protection cabinet, a lower partition plate is fixedly installed at the position, close to the bottom end, in the protection cabinet, and a closed cavity is formed between the lower partition plate and the upper partition plate. According to the invention, the transformer is fixed in the closed chamber in the protection cabinet, and the anti-oxidation aerial fog is diffused into the closed chamber to create an anti-rust and anti-corrosion environment to protect the transformer, so that the transformer is not corroded in any severe environment in the transportation process at the outlet, and the collision damage can be avoided; the performance and the service life of the dry-type transformer at the outlet are ensured; the dry-type transformer disclosed by the invention can be operated and used in a severe environment, the restriction of the external environment on the use of the dry-type transformer is eliminated, and the applicability of the dry-type transformer is greatly enhanced.

Description

Technical Field

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

[0002] A dry-type transformer is a transformer that does not require the use of oil as a medium. Its structure is relatively simple and usually consists of an iron core, coils, and other basic components. Compared with traditional transformers, dry-type transformers have higher efficiency and higher capacity, and are becoming increasingly popular in the industrial and commercial fields, especially in power transmission and distribution systems.

[0003] In recent years, the export volume of dry-type transformers in China has been increasing rapidly. During the sea transportation of exported dry-type transformers, the dry-type transformers will be affected by harsh environments such as high humidity and high salt density (the transportation temperature of dry-type transformers should be controlled between -25°C and 40°C, and the transportation humidity should be controlled between 30% and 80%, neither too high nor too low). These factors will cause corrosion of the transformer shell and internal structural components. Specifically, the marine atmosphere contains a large amount of chloride ions, which have high conductivity and are easy to form microcells and macrocells on the metal surface, increasing the activity of corrosion, destroying the passivation film on the metal surface, accelerating the aging of insulating materials, resulting in an accelerated corrosion rate and performance degradation of various materials, and 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 art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a transformer protection device and a dry-type transformer, which can solve the problem that the 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 shell and internal structural components, and seriously affecting the service life of the exported dry-type transformers.

[0007] To achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows: A transformer protection device includes a protection cabinet and a liquid storage tank; At a position near the top inside the protection cabinet, an upper partition is fixedly installed. At a position near the bottom inside the protection cabinet, a lower partition is fixedly installed. There is a closed chamber 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 board, and an upper chamber is provided above the upper partition board; The liquid storage tank is fixedly installed outside the protective cabinet. An antioxidant is stored inside the liquid storage tank. 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. An electromagnetic valve and a liquid pump are fixedly installed on the liquid supply pipe; A plurality of diffusion holes are formed in the lower partition board, and the inside of the lower chamber is communicated with the inside of the closed chamber through the plurality of diffusion holes; A flow dividing box is fixedly installed on the lower end surface of the lower partition board. A blower is fixedly installed on the flow dividing box. A cooling gas path is provided on the transformer. One end of the cooling gas path is communicated with the inside of the flow dividing box. An air equalizing box is fixedly installed on the upper end surface of the upper partition board. The other end of the cooling gas path is communicated with the inside of the air equalizing box. A plurality of through holes are formed in the upper end surface of the air equalizing box; A second fin is fixedly installed inside the upper chamber. A secondary heat exchange component is installed on the liquid storage tank. A return air box is fixedly installed on the second fin. The secondary heat exchange component is connected to the return air box; A return air automatic switching structure is arranged inside the return air box.

[0008] In one or more embodiments of the present invention, the components of the antioxidant include a corrosion inhibitor, a rust preventive powder, an organic solvent, and a retention agent; The corrosion inhibitor is polyglycerol oleate, the rust preventive powder is red lead powder, the organic solvent is isopropyl alcohol, and the retention agent is diethylene glycol monomethyl ether; According to the weight ratio of the components, polyglycerol oleate is 12 - 15 g / L, red lead powder is 21 - 30 g / L, isopropyl alcohol is 900 - 950 g / L, and diethylene glycol monomethyl ether is 16 - 20 g / L.

[0009] In one or more embodiments of the present invention, the return air automatic switching structure includes a C-shaped frame. The C-shaped frame is slidably installed inside the return air box. A return air port is arranged on one side of the return air box. Upper and lower outlets are respectively formed on the upper and lower end surfaces of the return air box. First and second openings are respectively formed on the upper and lower end surfaces of the C-shaped frame. The upper outlet and the lower outlet are respectively matched with the first opening and the second opening; A heat conduction pipe is fixedly installed on the second fin. One end of the heat conduction pipe penetrates from the opposite side of the return air port to the inside of the return air box and a gas bag is fixedly installed; A spring is fixedly installed between one side of the C-shaped frame and the inner wall of the return air box.

[0010] In one or more embodiments of the present invention, a first return air pipe is fixedly installed on the lower outlet. The end of the first return air pipe far from the return air box is communicated with the inside of the closed chamber; A first one-way valve is fixedly installed on the first return air pipe.

[0011] In one or more embodiments of the present invention, the secondary heat exchange assembly includes a second return air pipe. One end of the second return air pipe is fixedly installed on the upper outlet. A gas distribution pipe is fixedly installed at the end of the second return air pipe away from the air return box. A plurality of heat exchange pipes are fixedly installed on the gas distribution pipe. The plurality of heat exchange pipes penetrate through the inside of the liquid storage tank and a gas collecting pipe is fixedly installed; A connecting pipe is fixedly installed on the gas collecting pipe. The end of the connecting pipe away from the gas collecting pipe is communicated with the inside of the closed chamber; A second one-way valve is fixedly installed on the connecting pipe; A first fin is fixedly installed on the liquid storage tank.

[0012] In one or more embodiments of the present invention, a rotary cover and a second automatic pressure relief valve are fixedly installed on the liquid storage tank; A first automatic pressure relief valve is fixedly installed on the protective cabinet. The first automatic pressure relief valve is matched with the closed chamber; Double doors are arranged at the front end of the protective cabinet.

[0013] In one or more embodiments of the present invention, a guiding pipe is fixedly installed on the flow valve. A plurality of diffusing holes are formed in the guiding pipe.

[0014] In one or more embodiments of the present invention, a monitoring mechanism is fixedly installed inside the closed chamber. The monitoring mechanism includes a temperature sensor and an aerosol concentration sensor.

[0015] In one or more embodiments of the present invention, a dry-type transformer includes a dry-type transformer body. The dry-type transformer body includes an iron core. Clamping members are respectively fixedly installed at the upper and lower ends of the iron core. A coil assembly is sleeved outside the iron core; The coil assembly includes a high-voltage coil and a low-voltage coil. The low-voltage coil is sleeved outside the iron core. The high-voltage coil is sleeved outside the low-voltage coil. The cooling air path is arranged between the high-voltage coil and the low-voltage coil.

[0016] 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 side wall of the low-voltage coil and the inner side wall of the high-voltage coil. Upper and lower closing covers are respectively fixedly installed at the upper and lower ends of the high-voltage coil and the low-voltage coil; A plurality of upper fixing pipes are fixedly installed on the upper closing cover. The ends of the plurality of upper fixing pipes away from the upper closing cover are fixedly installed on the upper partition plate. The inside of the air equalizing box is communicated with the inside of the cooling air duct through the plurality of upper fixing pipes; A plurality of lower fixed pipes are fixedly installed on the lower closed cover, and one end of each of the plurality of lower fixed pipes away from the lower closed cover is fixedly installed on the lower partition board. The inside of the shunt box is communicated with the inside of the cooling air duct through the plurality of lower fixed pipes.

[0017] Compared with the prior art, in the present invention, the transformer is fixed in the closed chamber inside the protective cabinet, and then an antioxidant aerosol is diffused into the closed chamber to create an anti-rust and anti-corrosion environment for protecting the transformer, so that the transformer will not be corroded when encountering harsh environments during transportation, and can avoid collision damage, ensuring the performance and service life of the exported dry-type transformer. The dry-type transformer of the present invention can operate normally in the closed chamber, and has good heat dissipation during operation, so that the dry-type transformer can operate and be used in harsh environments, eliminating the restriction 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

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is the structure of a transformer protection device in an embodiment of the present invention Figure 1 ; Figure 2 is the cross-section of a transformer protection device and a dry-type transformer in an embodiment of the present invention Figure 1 ; Figure 3 is the cross-section of a transformer protection device and a dry-type transformer in an embodiment of the present invention Figure 2 ; Figure 4 is the exploded view of the coil assembly of the dry-type transformer in an embodiment of the present invention; Figure 5 is the structure of a transformer protection device in an embodiment of the present invention Figure 2 ; Figure 6 is the front cross-sectional view of a transformer protection device and a dry-type transformer in an embodiment of the present invention; Figure 7 is in an embodiment of the present invention Figure 1 the enlarged view at A; Figure 8 is in an embodiment of the present invention Figure 3 the enlarged view at B; Figure 9 Cross-sectional view of the air return box of a transformer protection device in an embodiment of the present invention; Figure 10 Enlarged view of the monitoring mechanism of a transformer protection device in an embodiment of the present invention.

[0020] Description of main reference numerals: 10, protection cabinet; 11, double doors; 12, top plate; 13, lower partition; 131, diffusion hole; 14, lower chamber; 141, shunt box; 142, fan; 15, upper partition; 16, upper chamber; 161, air equalizing 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, guiding pipe; 271, diffusing hole; 30, dry-type transformer body; 31, iron core; 32, clamping piece; 33, coil assembly; 331, high-voltage coil; 332, low-voltage coil; 333, cooling air duct; 334, upper closing cover; 335, lower closing cover; 34, upper fixing pipe; 35, lower fixing pipe; 40, second fin; 50, air return box; 501, air return port; 502, C-shaped frame; 5021, first opening; 5022, second opening; 503, lower outlet; 504, upper outlet; 505, spring; 51, first air return pipe; 511, first one-way valve; 52, second air return pipe; 53, heat conduction pipe; 531, airbag; 54, branch pipe; 55, heat exchange pipe; 56, collecting pipe; 561, connecting pipe; 562, second one-way valve; 60, monitoring mechanism; 61, temperature sensor; 62, aerosol concentration sensor. Detailed implementation manners

[0021] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figures 1 - 10 shown, a transformer protection device in an embodiment of the present invention includes a protection cabinet 10 and a liquid storage tank 20. An upper partition 15 is fixedly installed at a position near the top inside the protection cabinet 10, and a lower partition 13 is fixedly installed at a position near the bottom inside the protection cabinet 10. There is a closed chamber between the lower partition 13 and the upper partition 15, and the transformer is fixedly installed inside the closed chamber. A double door 11 is provided at the front end of the closed chamber for regular maintenance and repair of the internal transformer.

[0023] As Figure 2 shown, the above 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. Clamping members 32 are fixedly installed at the upper and lower ends of the iron core 31 respectively. Among them, high-voltage terminals, low-voltage outgoing copper bars and lifting rings are also installed on the clamping member 32 at the upper end of the iron core 31.

[0024] As Figure 4 shown, a coil assembly 33 is sleeved outside 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 outside the iron core 31, and the high-voltage coil 331 is sleeved outside 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.

[0025] Among them, the cooling air path includes a cooling air duct 333. The cooling air duct 333 is located between the outer side wall of the low-voltage coil 332 and the inner side wall of the high-voltage coil 331. Upper closing covers 334 and lower closing covers 335 are fixedly installed at the upper and lower ends of the high-voltage coil 331 and the low-voltage coil 332 respectively. The upper closing covers 334 and the lower closing covers 335 can seal the cooling air duct 333 so as to conduct heat in a directional manner, so that the heat will not directly diffuse into the closed chamber, ensuring that the temperature inside the closed chamber is constant. At the same time, it can also prevent the inside of the cooling air duct 333 from being polluted or falling into sundries, ensuring the safe operation of the dry-type transformer.

[0026] Multiple groups of upper fixing pipes 34 are fixedly installed on the upper closing cover 334. One ends of the multiple groups of upper fixing pipes 34 far away from the upper closing cover 334 are fixedly installed on the upper partition board 15, and the upper end of the dry-type transformer is fixed through the multiple groups of upper fixing pipes 34; multiple groups of lower fixing pipes 35 are fixedly installed on the lower closing cover 335. One ends of the multiple groups of lower fixing pipes 35 far away from the lower closing cover 335 are fixedly installed on the lower partition board 13, and the lower end of the dry-type transformer is fixed through the multiple groups of lower fixing pipes 35. Through the above method, the dry-type transformer can be completely fixed inside the closed chamber, so that the dry-type transformer is well protected and prevented from being damaged by collision or vibration during transportation.

[0027] As Figure 2 and Figure 3 shown, a lower chamber 14 is provided below the lower partition board 13. A plurality of diffusion holes 131 are formed on the lower partition board 13, and the inside of the lower chamber 14 is connected to the inside of the closed chamber through the plurality of diffusion holes 131.

[0028] 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. Among them, 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 direct contact between the corrosive medium and 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 follow the volatilization in the volatile solvent to form an anti-corrosion aerosol. The organic solvent is isopropanol, 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 play a role.

[0029] Specifically, the antioxidant is prepared according to the following weight ratio: 15 g / L of polyglycerol oleic acid, 25 g / L of red lead powder, 940 g / L of isopropyl alcohol, and 20 g / L of diethylene glycol monomethyl ether, and the antioxidant is obtained after being fully mixed. The antioxidant has good anti-corrosion and anti-rust properties, is easy to volatilize to form an antioxidant mist, and the antioxidant mist can persist for a certain period of time.

[0030] like Figure 1 , Figure 2 Combination Figure 5 As shown, a flow valve 26 is fixedly installed inside the lower chamber 14, a liquid supply pipe 24 is fixedly installed between the liquid storage tank 20 and the flow valve 26, and a solenoid valve 241 and a liquid pump 25 are fixedly installed on the liquid supply pipe 24, and the solenoid valve 241 is used to control the on-off of the liquid supply pipe 24. The antioxidant inside the liquid storage tank 20 can be extracted by the liquid pump 25 and transmitted to the flow valve 26 through the liquid supply pipe 24, and the flow rate of the antioxidant can be controlled by the flow valve 26.

[0031] A guide pipe 27 is fixedly installed on one side of the flow valve 26 , and a plurality of diffuser holes 271 are provided on the guide pipe 27 . The antioxidant can be uniformly sprayed into the lower chamber 14 through the plurality of diffuser holes 271 .

[0032] Specifically, by uniformly 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 a number 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.

[0033] 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.

[0034] More notably, by placing the dry-type transformer in an antioxidant aerosol, the dry-type transformer can operate normally in special environments, such as environments vulnerable to rain, moisture, high temperature, high heat or direct sunlight, and places with corrosive liquids, gases, dust, conductive fibers or metal filings. The dry-type transformer can overcome the usage limitations of the above-mentioned harsh environments and significantly enhance the service life of the dry-type transformer.

[0035] As Figure 3 Combined Figure 4 As shown, since the dry-type transformer is in a closed chamber filled with antioxidant aerosol, it faces serious heat dissipation problems during operation. Therefore, a shunt box 141 is fixedly installed on the lower end face of the lower partition plate 13, a fan 142 is fixedly installed on the shunt box 141, and the inside of the shunt box 141 is connected to the inside of the cooling air duct 333 through a lower fixing pipe 35. By starting the fan 142, the air in the closed chamber can be extracted and sent into the cooling air duct 333 through the shunt box 141 and the lower fixing pipe 35.

[0036] As Figure 2 And Figure 3 As shown, an upper chamber 16 is provided above the upper partition plate 15, a gas equalizing box 161 is fixedly installed on the upper end face of the upper partition plate 15, and the inside of the gas equalizing box 161 is connected to the inside of the cooling air duct 333 through an upper fixing pipe 34. The air entering the inside of the cooling air duct 333 can enter the inside of the gas equalizing box 161 through the upper fixing pipe 34. A number of through holes 1611 are opened on the upper end face of the gas equalizing box 161. Finally, the air is discharged through the number of through holes 1611.

[0037] A second fin 40 is fixedly installed inside the upper chamber 16. The second fin 40 is located directly above the gas equalizing box 161, and one end of the second fin 40 is inside the upper chamber 16, and the other end is exposed to the external air. The air discharged through the number of through holes 1611 can just blow onto the surface of the second fin 40, and heat exchange and cooling are carried out through the second fin 40.

[0038] A top plate 12 is fixedly installed above the protective cabinet 10. The top plate 12 can shield the second fin 40 to prevent it from being directly irradiated by sunlight and causing its own temperature to be too high, thus ensuring its heat exchange effect.

[0039] Specifically, a temperature probe is installed inside the cooling air duct 333 to monitor its internal temperature. When the internal temperature of the cooling air duct 333 is too high during the operation of the dry-type transformer, the fan 142 is started to extract the air in the closed chamber and send it into the cooling air duct 333. The air entering the cooling air duct 333 flows upward to take away heat, and finally blows onto the surface of the second fin 40 through the number of through holes 1611. Heat exchange is carried out between the second fin 40 and the air to cool the air.

[0040] As Figure 3 and Figure 8 shown, an air return box 50 is fixedly installed on the second fin 40. An air return port 501 is arranged on one side of the air return box 50. A first air return pipe 51 is fixedly installed at the bottom end of the air return box 50. The first air return pipe 51 is communicated with the inside of the closed chamber. The air cooled by heat exchange with the second fin 40 can enter the inside of the air return box 50 through the air return port 501, and then flow back into the inside of the closed chamber through the first air return pipe 51 to realize cyclic heat dissipation.

[0041] Among them, as Figure 6 shown, a first one-way valve 511 is fixedly installed on the first air return pipe 51. The first one-way valve 511 enables air to only flow back from the air return box 50 to the closed chamber, and the air in the closed chamber cannot enter the inside of the air return box 50 through the first air return pipe 51.

[0042] It should be noted that during the heat dissipation process, when the air containing the antioxidant aerosol enters the inside of 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 from causing a decline in insulation performance and ensuring the safe operation of the dry-type transformer.

[0043] Since the heat exchange and cooling effect of the second fin 40 on air is limited, 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 fin 40 cannot meet the heat dissipation requirement, the secondary heat exchange component can be used to perform secondary high-efficiency cooling on the air.

[0044] As Figure 8 and Figure 9 shown, an air return automatic switching structure is arranged inside the air return box 50. The air return automatic switching structure includes a C-shaped frame 502. The C-shaped frame 502 is slidably installed inside the air return box 50. Upper outlets 504 and lower outlets 503 are respectively opened on the upper and lower end faces of the air return box 50. One end of the first air return pipe 51 is fixedly installed on the lower outlet 503, and the upper outlet 504 is connected to the secondary heat exchange component. First openings 5021 and second openings 5022 are respectively opened on the upper and lower end faces of the C-shaped frame 502. In the initial state, the lower outlet 503 and the second opening 5022 are in a coincident state, and the upper outlet 504 and the first opening 5021 are in a misaligned state. At this time, air can only enter the inside of the first air return pipe 51 through the second opening 5022 and the lower outlet 503 and directly flow back into the closed chamber.

[0045] A heat conduction tube 53 is fixedly installed on the second fin 40. One end of the heat conduction tube 53 penetrates from the opposite side of the gas return port 501 to the inside of the gas return box 50 and is fixedly installed with an airbag 531. When the second fin 40 cannot meet the heat dissipation requirement, its own temperature will continue to rise. At this time, the second fin 40 will conduct heat to the heat conduction tube 53, causing the temperature of the heat conduction tube 53 to continue to rise. According to the principle of thermal expansion and contraction, the internal pressure of the heat conduction tube 53 will continue to rise, resulting in the expansion of the airbag 531. The expansion of the airbag 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 after heat exchange by the second fin 40 cannot enter the first gas return pipe 51, but enters the secondary heat exchange assembly through the first opening 5021 and the upper outlet 504 for secondary heat exchange and cooling.

[0046] Wherein, a spring 505 is fixedly installed between one side of the C-shaped frame 502 and the inner wall of the gas return box 50, enabling the C-shaped frame 502 to slide elastically through the spring 505, and the structure is more stable and reliable.

[0047] As Figure 5 and Figure 6 shown, the secondary heat exchange assembly includes a second gas return pipe 52. One end of the second gas return pipe 52 is fixedly installed on the upper outlet 504, and the air that needs to be heat exchanged and cooled again can be led out through the second gas return pipe 52. The end of the second gas return pipe 52 far from the gas return box 50 is fixedly installed with a manifold 54, and a plurality of heat exchange pipes 55 are fixedly installed on the manifold 54. The plurality of heat exchange pipes 55 penetrate through the inside of the liquid storage tank 20 and are fixedly installed with a header pipe 56. During secondary heat exchange and cooling, the air uniformly enters the plurality of heat exchange pipes 55 through the manifold 54. During the process of flowing downward inside the plurality of heat exchange pipes 55, it will exchange heat with the antioxidant inside the liquid storage tank 20, and the antioxidant is used to perform secondary heat exchange and cooling on it, with relatively high efficiency.

[0048] As Figure 7 shown, a connecting pipe 561 is fixedly installed on the header pipe 56. The end of the connecting pipe 561 far from the header pipe 56 is communicated with the inside of the closed chamber. The air after secondary heat exchange and cooling will first gather inside the header pipe 56 and then flow back to the inside of the closed chamber through the connecting pipe 561.

[0049] Wherein, a second one-way valve 562 is fixedly installed on the connecting pipe 561, enabling the air to only enter the closed chamber from the header 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.

[0050] 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 external air, which can exchange heat with the antioxidant to cool it down, prevent the temperature of the antioxidant from continuously rising, and at the same time enable the antioxidant to continuously exchange heat and cool down.

[0051] Specifically, if it is difficult to meet the cooling requirement through the second fin 40, the temperature of the second fin 40 will continuously rise. At this time, the temperature of the heat conduction tube 53 itself will rise, and the internal air pressure thereof will also rise accordingly, causing the airbag 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 into the closed chamber, but is introduced into the branch pipe 54 through the second return pipe 52, and then uniformly flows downward through the multiple heat exchange tubes 55. Since the heat exchange tubes 55 are immersed in the antioxidant, the air can fully exchange heat with the antioxidant during the downward flow process, so as to obtain secondary heat exchange cooling. Finally, it flows back into the closed chamber through the collecting pipe 56 and the connecting pipe 561, and the cycle can be carried out in this way.

[0052] It should be noted that during the process of air circulation cooling in the closed chamber, it always flows in a closed loop and will not leak, which not only avoids the loss of antioxidant mist but also protects the external environment.

[0053] A rotary cover 21 and a second automatic pressure relief valve 22 are also fixedly installed on the liquid storage tank 20. The rotary cover 21 can be opened to facilitate the addition of the antioxidant; the second automatic pressure relief valve 22 can automatically relieve the pressure inside the liquid storage tank 20 to prevent the internal pressure of the liquid storage tank 20 from continuously increasing due to the rise in the temperature of the antioxidant.

[0054] 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 the pressure inside the closed chamber to prevent an explosion due to excessive pressure inside the closed chamber.

[0055] In addition, as Figure 3 and Figure 10 shown, a monitoring mechanism 60 is fixedly installed inside the closed chamber. The monitoring mechanism 60 includes a temperature sensor 61 and an aerosol concentration sensor 62. Among them, the temperature sensor 61 is used to monitor the temperature in the closed chamber. When the temperature in the closed chamber is too high, the fan 142 is also automatically turned on for cooling. The aerosol concentration sensor 62 is used to monitor the concentration of the antioxidant aerosol in the closed chamber in real time. When the aerosol concentration is too low, the liquid pump 25 can be started to automatically spray the antioxidant into the lower chamber 14.

[0056] During use, the dry-type transformer is fixedly installed in the enclosed chamber through multiple upper fixing pipes 34 and multiple lower fixing pipes 35. Then, the liquid pump 25 is started to extract the antioxidant inside the liquid storage tank 20, and the antioxidant is evenly sprayed inside the lower chamber 14 through a number of diffusing holes 271, so that the antioxidant slowly volatilizes inside the lower chamber 14 to continuously form an antioxidant aerosol. At this time, the antioxidant aerosol will diffuse upward through a number of diffusion holes 131 into the enclosed chamber, creating an anti-rust and anti-corrosion environment inside the enclosed chamber, so that the internal dry-type transformer is in this environment. At this time, regardless of the transportation environment, it can ensure that the dry-type transformer will not be damaged, enabling the exported dry-type transformer to be safely transported to ensure its performance and service life.

[0057] The dry-type transformer can also operate in the enclosed chamber. When heat dissipation is required during operation, the fan 142 can be started to extract the air in the enclosed chamber and send it into the cooling air duct 333. The air enters the cooling air duct 333 and flows upward to carry away the heat, and finally blows to the surface of the second fin 40 through a number of through holes 1611, and exchanges heat with the air through the second fin 40 to cool the air. If it is difficult to meet the heat exchange and cooling requirements through the second fin 40, the temperature of the second fin 40 will continue to rise. At this time, the temperature of the heat conduction pipe 53 itself rises, and the air pressure inside it will also rise accordingly, causing the airbag 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 into the enclosed chamber, but is introduced into the branch pipe 54 through the second return air pipe 52, and then evenly flows downward through multiple heat exchange pipes 55. Since the heat exchange pipes 55 are immersed in the antioxidant, the air can fully exchange heat with the antioxidant during the downward flow process, so as to obtain secondary heat exchange and cooling. Finally, it flows back into the enclosed chamber through the header pipe 56 and the connecting pipe 561, and the cycle can be repeated.

[0058] In the present invention, the transformer is fixed in the enclosed chamber inside the protective cabinet 10, and then an anti-rust and anti-corrosion environment is created by diffusing an antioxidant aerosol into the enclosed chamber to protect the transformer, so that the transformer will not be corroded when encountering harsh environments during transportation, and can avoid collision damage, ensuring the performance and service life of the exported dry-type transformer; The dry-type transformer of the present invention can operate normally in the enclosed chamber, and has good heat dissipation during operation, enabling the dry-type transformer to operate and be used in harsh environments, eliminating the restriction of the external environment on the use of the dry-type transformer, and greatly enhancing the applicability of the dry-type transformer.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0060] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 at a position near the top end of the protective cabinet, a lower partition is fixedly installed at a position near the bottom end of the protective cabinet, a closed chamber is provided 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 outside the protective cabinet, the liquid storage tank stores antioxidants inside, and a liquid feeding mechanism is installed between the liquid storage tank and the lower chamber; The lower partition plate 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 installed on the lower end surface of the lower partition, a fan is fixedly installed 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 installed 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 installed inside the upper chamber, a secondary heat exchange component is installed on the liquid storage tank, an air return box is fixedly installed on the second fin, and the secondary heat exchange component is connected to the air return box; An automatic air return switching structure is arranged inside the air return box.

2. A transformer protection device according to claim 1, characterized in that: The antioxidant comprises corrosion inhibitor, anti-rust 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 isopropanol, and the retaining agent is diethylene glycol monomethyl ether; The components are mixed by weight: 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: The automatic air return switching structure comprises a C-shaped frame, which is slidably mounted inside the air return box, a return air port is arranged 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, and the upper outlet and the lower outlet are respectively matched with the first opening and the second opening; A heat conducting pipe is fixedly mounted on the second fin, one end of the heat conducting pipe passes through the inside 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.

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

5. A transformer protection device according to claim 4, characterized in that: The secondary heat exchange assembly comprises 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, a plurality of groups of heat exchange pipes are fixedly mounted on the air distribution pipe, and the plurality of 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; The liquid storage tank is fixedly mounted with a first fin.

6. A transformer protection device according to claim 5, 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 protection cabinet, and the first automatic pressure relief valve matches the closed chamber; The front end of the protective cabinet is provided with a double door.

7. A transformer protection device according to claim 1, characterized in that: A guide pipe is fixedly mounted on one end of the liquid feeding mechanism, and a plurality of diffuser holes are provided on the guide pipe.

8. A 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.

9. Dry-type transformer, characterized in that: The invention comprises a transformer protection device according to any one of claims 1 to 8, and further comprises a dry-type transformer body, wherein the dry-type transformer body comprises an iron core, and clamps are respectively 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 comprises a high-voltage coil and a low-voltage coil, wherein 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, and the cooling air path is arranged between the high-voltage coil and the low-voltage coil.

10. The dry-type transformer according to claim 9, 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; A plurality of groups of upper fixed tubes are fixedly installed on the upper closing cover, and one end of the plurality of groups of upper fixed tubes away from the upper closing cover is fixedly installed on the upper partition plate, and the interior of the gas equalization box is connected with the interior of the cooling air duct through the plurality of groups of upper fixed tubes; A plurality of groups of lower fixed tubes are fixedly mounted on the lower closing cover, and one end of the plurality of groups of lower fixed tubes away from the lower closing cover is fixedly mounted on the lower partition plate. The interior of the diverter box is connected with the interior of the cooling air channel through the plurality of groups of lower fixed tubes.

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