220kV oil-immersed transformer of low-frequency power transmission system

Abstract

The invention discloses a low-frequency power transmission system 220kV oil-immersed transformer which comprises a 220kV oil-immersed transformer body, and an oil-water mixed cooling mechanism is fixedly installed on the surface of the 220kV oil-immersed transformer body. The oil-water mixed cooling mechanism comprises a shell, a seawater filter is mounted on one side of an inner cavity of the shell, an oil heat exchanger is mounted on the other side of the inner cavity of the shell, and seawater coolers are mounted on the front side and the rear side of the oil heat exchanger. The invention aims to solve the technical problems that an existing 220kV oil-immersed transformer of a low-frequency power transmission system is used for offshore wind power low-frequency grid connection, oil-water mixed cooling of the transformer by combining seawater is inconvenient, the area of a radiator is easily caused to be too large, the size and the weight of the transformer are increased, the heat dissipation efficiency is low, and the service life of the transformer is prolonged. And the risk of aging of the insulating material due to over-high temperature is increased.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a 220kV oil-immersed transformer for a low-frequency power transmission system. Background Art

[0002] Oil-immersed transformers are power transformers that use insulating oil as a cooling and insulating medium. They are widely used in power transmission and distribution systems. Oil-immersed transformers change voltage through the turns ratio of the primary and secondary windings, transfer heat to the radiator through natural convection or forced circulation, and are cooled by air or water. Oil-immersed transformers are used for voltage regulation in substations and power transmission and distribution networks. The 220kV oil-immersed transformer for low-frequency transmission systems is a high-voltage transformer designed for low-frequency power transmission. It combines oil-immersed cooling technology and 220kV voltage level to optimize the efficiency and stability of power transmission in specific scenarios. The 220kV oil-immersed transformer achieves efficient and stable operation of low-frequency power transmission through core material upgrades, winding impedance matching, insulation system strengthening, and cooling directional optimization. Its core lies in balancing electromagnetic performance and thermal stability in low-frequency environments, while working in conjunction with frequency conversion equipment and transmission lines to ultimately reduce transmission losses over long distances or in special scenarios. 220kV oil-immersed transformers can be used for low-frequency grid connection of offshore wind power. Offshore wind power is boosted by 220kV oil-immersed transformers and transmitted to onshore converter stations via submarine cables. Low-frequency power transmission can reduce the capacitance effect of submarine cables and increase transmission distance and efficiency.

[0003] The existing 220kV oil-immersed transformer of the low-frequency transmission system is used for low-frequency grid connection of offshore wind power. It is not convenient to use seawater to cool the transformer with oil and water mixture, which easily leads to an excessively large radiator area, increasing the volume and weight of the transformer. In addition, the heat dissipation efficiency is low, increasing the risk of aging of insulation materials due to excessive temperature. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing 220kV oil-immersed transformer of the low-frequency transmission system is used for low-frequency grid connection of offshore wind power, which is not convenient for oil-water mixed cooling of the transformer in combination with seawater, which easily leads to an excessively large area of ​​the radiator, increasing the volume and weight of the transformer, and has a low heat dissipation efficiency, increasing the risk of aging of the insulation material due to excessive temperature.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A 220kV oil-immersed transformer of a low-frequency power transmission system, comprising a 220KV oil-immersed transformer, wherein an oil-water mixed cooling mechanism is fixedly installed on the surface of the 220KV oil-immersed transformer; The oil-water mixed cooling mechanism comprises a shell, a seawater filter is installed on one side of the shell inner cavity, an oil heat exchanger is installed on the other side of the shell inner cavity, and seawater coolers are installed on both the front and rear sides of the oil heat exchanger.

[0006] Preferably, one side of the seawater filter is connected to a first water inlet pipe and a second water inlet pipe through a valve, and the first water inlet pipe and the second water inlet pipe penetrate to the outside of the shell, and the other side of the seawater filter is connected to a first circulation pipe and a sewage pipe through a valve, and the sewage pipe penetrates to the outside of the shell, the first circulation pipe is connected to the water inlet end of the seawater cooler, and the water outlet end of the seawater cooler is connected to the second circulation pipe, and the second circulation pipe is connected to the sewage pipe through a valve.

[0007] Preferably, a controller is fixedly installed on the front side of the shell, an oil temperature sensor is fixedly installed in the inner cavity of the shell, the detection end of the oil temperature sensor passes through the inner cavity of the 220KV oil-immersed transformer, a ventilation net is fixedly connected to the bottom and right side of the shell, a cooling fan is fixedly connected to the inner side of the ventilation net, and the number of the cooling fans is several.

[0008] Preferably, an oil pump is fixedly installed in the inner cavity of the shell, the oil inlet end of the oil pump passes through the top of the inner cavity of the 220KV oil-immersed transformer, the oil outlet end of the oil pump is connected to the oil inlet end of the oil heat exchanger, and the oil outlet end of the oil heat exchanger passes through the bottom of the inner cavity of the 220KV oil-immersed transformer.

[0009] Preferably, the inner cavity of the seawater filter is fixedly installed with a first filter component, a second filter component, an electrode and a seawater barrier net, the second filter component is located on the top of the first filter component, the electrode and the seawater barrier net are located on the top of the second filter component, and the seawater barrier net is located at the water inlet end of the first circulation pipe to extend the discharge time of seawater.

[0010] Preferably, a redox potential sensor is fixedly mounted on the top of the surface of the seawater filter, and a detection end of the redox potential sensor penetrates into the inner cavity of the seawater filter.

[0011] Preferably, a serpentine pipe is fixedly installed in the inner cavity of the seawater cooler, the water inlet end of the serpentine pipe is connected to the first circulation pipe, and the water outlet end of the serpentine pipe is connected to the second circulation pipe.

[0012] Preferably, a plurality of vibration components are fixedly installed in the inner cavity of the seawater cooler, and the vibration ends of the vibration components are located at the bending parts of the serpentine tube.

[0013] Preferably, a sliding member is movably connected to the inner cavity of the vibration component, one end of the sliding member is fixedly connected to a spring, and one end of the spring is fixedly connected to the inner wall of the vibration component.

[0014] Preferably, the other end of the sliding member is respectively fixedly connected with a ceramic vibration plate and a vibrating rod, the ceramic vibration plate is sleeved on the surface of the vibrating rod, one end of the vibration assembly is provided with a vibration head movably connected to the serpentine tube, and the spherical end of the vibrating rod is located in the inner cavity of the vibration head.

[0015] Beneficial effects of the present invention: 1. The present invention utilizes seawater as a cooling medium and transfers heat through a serpentine tube and an oil heat exchanger, which greatly improves the heat dissipation efficiency. Compared with a penetrating heat dissipation structure, the area is smaller. By setting a vibration component, scale can be prevented, pipeline friction resistance can be reduced, and the power consumption of the seawater pump can be reduced. The hypochlorite generated by electrolysis of seawater replaces the chemical bactericide, which can reduce the operating cost. The first filter is a titanium alloy sintered filter. The titanium alloy sintered filter intercepts sediment and algae through a three-dimensional through-hole structure, while allowing high-flow seawater to pass through. The second filter is a modified activated carbon fiber filter. The surface of the modified activated carbon fiber filter is grafted with a quaternary ammonium group -N⁺(CH3)3, which preferentially adsorbs negatively charged humic acid and microbial metabolites. The third filter is a nano-ceramic-zeolite composite membrane, which intercepts bacteria and micro-plankton.

[0016] 2. The present invention can electrolyze seawater to generate ClO⁻ and inhibit biofilm formation through electrodes with IrO2-Ta2O5 coating. The electrode polarity is reversed every 8 hours to strip off CaCO3 deposits and avoid electrode passivation. The ORP sensor monitors seawater in real time and dynamically adjusts the electrolysis current according to the redox potential to accurately control the ClO⁻ concentration and avoid overoxidation to generate ClO3⁻. When the oil temperature is greater than 65°C, the oil pump automatically runs at full power and switches to low power mode after cooling to extend the life of the oil pump. The motor drives the arc filter to be flushed, which can improve the maintenance cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the oil-water mixed cooling mechanism of the present invention.

[0019] Figure 3 It is a cross-sectional view of the oil-water mixed cooling mechanism of the present invention.

[0020] Figure 4 It is a schematic diagram of the oil heat exchanger and the seawater cooler of the present invention.

[0021] Figure 5 It is a cross-sectional view of the seawater cooler of the present invention.

[0022] Figure 6 It is a cross-sectional view of the vibration component of the present invention.

[0023] Figure 7 It is a cross-sectional view of the first filter component of the present invention.

[0024] Figure 8 It is a cross-sectional view of the second filter component of the present invention.

[0025] Fig. 9 Schematic diagram of the electrode of the present invention.

[0026] In the figure: 100, 220kV oil-immersed transformer; 200, oil-water mixed cooling mechanism; 201, shell; 202, second water inlet pipe; 203, first water inlet pipe; 204, controller; 205, sewage pipe; 206, ventilation network; 207, seawater filter; 208, redox potential sensor; 209, electrode; 210, seawater barrier net; 211, first circulation pipe; 212, oil temperature sensor; 213, oil heat exchanger; 214, oil pump; 215, seawater cooler; 2 16. Second circulation pipe; 217. Cooling fan; 218. Second filter assembly; 219. First filter assembly; 220. Serpentine pipe; 221. Vibration assembly; 222. Spring; 223. Sliding part; 224. Ceramic vibration plate; 225. Vibrating rod; 226. Vibrating head; 227. Plate; 228. Motor; 229. Limit seat; 230. Rotating drum; 231. Water outlet bucket; 232. Arc filter; 233. First filter; 234. Second filter; 235. Third filter. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1-Figure 9 As shown, this embodiment provides a 220 kV oil-immersed transformer for a low-frequency power transmission system, including a 220 kV oil-immersed transformer 100 , wherein an oil-water mixed cooling mechanism 200 is fixedly installed on the surface of the 220 kV oil-immersed transformer 100 .

[0029] The oil-water mixed cooling mechanism 200 includes a shell 201 , a seawater filter 207 is installed on one side of the inner cavity of the shell 201 , an oil heat exchanger 213 is installed on the other side of the inner cavity of the shell 201 , and seawater coolers 215 are installed on both the front and rear sides of the oil heat exchanger 213 .

[0030] An oil pump 214 is fixedly installed in the inner cavity of the shell 201. The oil inlet end of the oil pump 214 penetrates to the top of the inner cavity of the 220kV oil-immersed transformer 100. The oil outlet end of the oil pump 214 is connected to the oil inlet end of the oil heat exchanger 213. The oil outlet end of the oil heat exchanger 213 penetrates to the bottom of the inner cavity of the 220kV oil-immersed transformer 100.

[0031] A controller 204 is fixedly installed on the front of the shell 201, an oil temperature sensor 212 is fixedly installed in the inner cavity of the shell 201, and the detection end of the oil temperature sensor 212 penetrates into the inner cavity of the 220kV oil-immersed transformer 100. A ventilation net 206 is fixedly connected to the bottom and right side of the shell 201, and a cooling fan 217 is fixedly connected to the inner side of the ventilation net 206. The number of cooling fans 217 is several.

[0032] The oil-water mixed cooling mechanism 200 circulates the transformer oil in the 220kV oil-immersed transformer 100, and uses seawater to cool the transformer oil during the circulation process. The oil temperature sensor 212 detects the temperature of the transformer, and the detection signal is transmitted to the controller 204. When the detected temperature is higher than the set temperature, the oil pump 214 extracts the transformer oil in the 220kV oil-immersed transformer 100, and the transformer oil circulates in the oil heat exchanger 213. During the circulation process, the seawater in the seawater cooler 215 cools the transformer oil. The cooled transformer oil The water flows back to the inner cavity of the 220kV oil-immersed transformer 100. An aluminum alloy heat sink is arranged on the outer side of the seawater cooler 215. During the operation of the seawater cooler 215, the cooling fan 217 on the right side draws air from the outside through the ventilation net 206. The air cools the aluminum alloy heat sink and the serpentine tube 220 inside the seawater cooler 215. The cooling fan 217 at the bottom draws hot air and discharges it to the outside through the ventilation net 206 at the bottom. By setting the oil-water mixed cooling mechanism 200, the area of ​​the heat dissipation structure can be reduced, and the heat dissipation efficiency can be greatly improved by dissipating the heat through seawater.

[0033] One side of the seawater filter 207 is connected to the first water inlet pipe 203 and the second water inlet pipe 202 through a valve, and the first water inlet pipe 203 and the second water inlet pipe 202 penetrate to the outside of the shell 201. The other side of the seawater filter 207 is connected to the first circulation pipe 211 and the sewage pipe 205 through a valve, and the sewage pipe 205 penetrates to the outside of the shell 201. The first circulation pipe 211 is connected to the water inlet end of the seawater cooler 215, and the water outlet end of the seawater cooler 215 is connected to the second circulation pipe 216, and the second circulation pipe 216 is connected to the sewage pipe 205 through a valve.

[0034] The inner cavity of the seawater filter 207 is fixedly installed with a first filter component 219, a second filter component 218, an electrode 209 and a seawater barrier net 210, the second filter component 218 is located on the top of the first filter component 219, the electrode 209 and the seawater barrier net 210 are located on the top of the second filter component 218, and the seawater barrier net 210 is located at the water inlet end of the first circulation pipe 211 to extend the discharge time of seawater.

[0035] During the operation of the seawater filter 207, seawater enters the top of the inner cavity of the seawater filter 207 through the first water inlet pipe 203, and the first filter component 219, the second filter component 218 and the electrode 209 filter and process the seawater in turn. The treated seawater passes through the seawater barrier net 210 and enters the inner cavity of the first circulation pipe 211, and enters the inner cavity of the seawater cooler 215 for circulation. During the circulation process, the transformer oil in the oil heat exchanger 213 is heat-absorbed. The seawater after heat absorption enters the sewage pipe 205 through the second circulation pipe 216, and enters the waste heat recovery device through the sewage pipe 205, and the waste heat is recovered. For recycling, when backwashing is performed, the first water inlet pipe 203, the first circulation pipe 211 and the second circulation pipe 216 are closed, and the cleaning water enters the top of the inner cavity of the seawater filter 207 through the second water inlet pipe 202. The cleaning water is a mixture of water and a cleaning agent. The cleaning water first rinses the dirt on the surface of the electrode 209, and then passes through the second filter component 218 and the first filter component 219 to enter the bottom of the inner cavity of the seawater filter 207, taking away the impurities and dirt inside the second filter component 218 and the first filter component 219. The sewage generated by cleaning is discharged through the sewage pipe 205 and enters the sewage collection and treatment equipment.

[0036] The first filter assembly 219 includes a plate body 227, which is fixedly connected to the bottom of the inner cavity of the seawater filter 207, a motor 228 is fixedly connected to the bottom of the plate body 227, an output shaft of the motor 228 is fixedly connected to a rotating drum 230, a plurality of arc-shaped filter screens 232 are installed around the surface of the rotating drum 230, the top of the rotating drum 230 is rotatably connected to a limiting seat 229, the limiting seat 229 is fixedly connected to the inner cavity of the seawater filter 207, a water outlet bucket 231 is fixedly connected to the inner wall of the limiting seat 229, and the bottom of the water outlet bucket 231 extends to the top of the inner cavity of the rotating drum 230 and is rotatably connected thereto.

[0037] When the first filter component 219 is filtering, seawater passes through the arc filter 232 and enters the drum 230. The arc filter 232 filters larger impurities in the seawater. The filtered seawater passes through the water outlet 231 and enters the second filter component 218 for secondary filtration. When backflushing, the cleaning water backwashed inside the second filter component 218 enters the inner cavity of the drum 230 through the water outlet 231, and passes through the arc filter 232 to enter the bottom of the inner cavity of the seawater filter 207. When passing through the arc filter 232, impurities on its surface are taken away, and the sewage with impurities is discharged through the sewage pipe 205 into the sewage collection and treatment equipment.

[0038] The inner cavity of the second filter component 218 is provided with a first filter 233, a second filter 234 and a third filter 235 from bottom to top. The first filter 233 is a titanium alloy sintered filter. The titanium alloy sintered filter intercepts mud and algae through a three-dimensional through-hole structure while allowing high-flow seawater to pass through. The second filter 234 is a modified activated carbon fiber filter. The surface of the modified activated carbon fiber filter is grafted with quaternary ammonium groups -N⁺(CH3)3, which preferentially adsorb negatively charged humic acid and microbial metabolites. The third filter 235 is a nano-ceramic-zeolite composite membrane, which intercepts bacteria and micro-plankton.

[0039] By setting the electrode 209, seawater can be electrolyzed to generate hypochlorite ions, which can continuously inhibit the formation of biofilm and prevent the internal blockage of the seawater cooler 215. The electrode 209 is a cylindrical titanium mesh, and the surface is coated with an IrO2-Ta2O5 catalytic layer with a thickness of 2-3μm. The IrO2-Ta2O5 catalytic layer forms a stable conductive oxide layer in seawater, inhibits the dissolution of the titanium substrate, and extends the life of the substrate by more than 5 times.

[0040] The number of electrodes 209 is several, and cathode electrodes and anode electrodes are arranged alternately, and the distance between the cathode electrodes and the anode electrodes is 1.5-2 mm.

[0041] A seawater barrier net 210 is provided on the outlet side of the electrode 209, so that the residence time of seawater is extended to 8-10 seconds when it flows through the electrode area.

[0042] During the operation of electrode 209, the polarity of the cathode and the anode is switched every 8 hours for 30 seconds, and the CaCO3 deposits on the electrode surface are stripped by reverse current.

[0043] A redox potential sensor 208 is fixedly mounted on the top of the surface of the seawater filter 207 , and a detection end of the redox potential sensor 208 penetrates into the inner cavity of the seawater filter 207 .

[0044] The redox potential sensor 208 monitors the redox potential ORP, and directly correlates the ClO⁻ concentration through electrochemical signals to achieve real-time, continuous, and reagent-free control of the fungicide concentration. In seawater containing ClO⁻, an increase in the ORP value indicates an increase in the concentration of oxidizing substances. When ORP is less than 650mV, the electrolysis current density is increased to accelerate the oxidation of Cl⁻ to generate ClO⁻. When ORP is greater than 700mV, the current is reduced or the pulse mode is switched to avoid overoxidation to generate byproducts such as ClO3⁻.

[0045] A serpentine tube 220 is fixedly installed in the inner cavity of the seawater cooler 215 . The water inlet end of the serpentine tube 220 is connected to the first circulation pipe 211 , and the water outlet end of the serpentine tube 220 is connected to the second circulation pipe 216 .

[0046] A plurality of vibration components 221 are fixedly installed in the inner cavity of the seawater cooler 215 , and the vibration ends of the vibration components 221 are located at the bending parts of the serpentine tube 220 .

[0047] A sliding member 223 is movably connected to the inner cavity of the vibration component 221 , one end of the sliding member 223 is fixedly connected to a spring 222 , and one end of the spring 222 is fixedly connected to the inner wall of the vibration component 221 .

[0048] The other end of the sliding member 223 is fixedly connected to a ceramic vibration plate 224 and a vibrating rod 225 respectively. The ceramic vibration plate 224 is sleeved on the surface of the vibrating rod 225. One end of the vibration component 221 is provided with a vibration head 226 movably connected to the serpentine tube 220, and the spherical end of the vibrating rod 225 is located in the inner cavity of the vibration head 226.

[0049] When the seawater circulates inside the seawater cooler 215, it flows inside the serpentine tube 220. The inner cavity of the seawater cooler 215 is filled with heat transfer liquid. The connection between the seawater cooler 215 and the oil heat exchanger 213 is provided with heat transfer silicone grease. The oil heat exchanger 213 is provided with a transformer oil circulation pipe. The heat of the transformer oil is transferred to the seawater inside the serpentine tube 220 through the transformer oil circulation pipe, the heat transfer silicone grease and the heat transfer liquid. The seawater absorbs the heat during the flow inside the serpentine tube 220. Finally, the seawater after absorbing the heat is discharged through the second circulation pipe 216. The serpentine tube 220 is in the process of circulating the seawater. During the process, the vibration component 221 vibrates the curved part of the serpentine tube 220, which can inhibit scaling and biofouling through vibration, destroy the crystallization process of calcium and magnesium ions, reduce the formation of hard scale, reduce the roughness of the pipe wall, and high-frequency vibration can interfere with the attachment of microorganisms to avoid corrosion hazards. The vibration force peels off the formed soft scale and reduces the frequency of chemical cleaning. The laminar flow is disturbed at the bend by vibration, the local Reynolds number is increased, and the heat transfer efficiency of the heat exchange system can be increased by 5-10%. After reducing scaling, the smoothness of the inner wall of the pipeline is restored, the friction resistance is reduced, and the pumping energy consumption is saved by about 8-15%.

[0050] During the operation of the vibration component 221, the ceramic vibration plate 224 drives the sliding part 223 and the vibrating rod 225 to vibrate. During the vibration of the sliding part 223, the spring 222 is driven to expand and contract. The spring 222 elastically supports the sliding part 223. The sliding part 223 drives the vibrating rod 225 to hit the vibration head 226. The vibration head 226 transmits the high-frequency vibration to the bending part of the serpentine tube 220, and transmits it to the entire serpentine tube 220 through the bending part.

Claims

1. A 220 kV oil-immersed transformer for a low-frequency power transmission system, comprising a 220 kV oil-immersed transformer (100), characterized in that: An oil-water mixed cooling mechanism (200) is fixedly mounted on the surface of the 220 kV oil-immersed transformer (100); The oil-water mixed cooling mechanism (200) comprises a shell (201), a seawater filter (207) is installed on one side of the inner cavity of the shell (201), an oil heat exchanger (213) is installed on the other side of the inner cavity of the shell (201), and seawater coolers (215) are installed on both the front and rear sides of the oil heat exchanger (213).

2. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 1, characterized in that: One side of the seawater filter (207) is connected to a first water inlet pipe (203) and a second water inlet pipe (202) through a valve, and the first water inlet pipe (203) and the second water inlet pipe (202) penetrate to the outside of the shell (201). The other side of the seawater filter (207) is connected to a first circulation pipe (211) and a sewage pipe (205) through a valve, and the sewage pipe (205) penetrates to the outside of the shell (201). The first circulation pipe (211) is connected to a water inlet end of a seawater cooler (215), and a water outlet end of the seawater cooler (215) is connected to a second circulation pipe (216), and the second circulation pipe (216) is connected to the sewage pipe (205) through a valve.

3. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 2, characterized in that: A controller (204) is fixedly installed on the front of the shell (201), an oil temperature sensor (212) is fixedly installed in the inner cavity of the shell (201), and the detection end of the oil temperature sensor (212) penetrates into the inner cavity of the 220 kV oil-immersed transformer (100). A ventilation net (206) is fixedly connected to the bottom and right side of the shell (201), and a cooling fan (217) is fixedly connected to the inner side of the ventilation net (206), and the number of the cooling fans (217) is several.

4. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 3, characterized in that: An oil pump (214) is fixedly installed in the inner cavity of the housing (201); the oil inlet end of the oil pump (214) penetrates to the top of the inner cavity of the 220 kV oil-immersed transformer (100); the oil outlet end of the oil pump (214) is connected to the oil inlet end of the oil heat exchanger (213); and the oil outlet end of the oil heat exchanger (213) penetrates to the bottom of the inner cavity of the 220 kV oil-immersed transformer (100).

5. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 4, characterized in that: A first filter assembly (219), a second filter assembly (218), an electrode (209) and a seawater barrier net (210) are fixedly installed in the inner cavity of the seawater filter (207); the second filter assembly (218) is located on the top of the first filter assembly (219); the electrode (209) and the seawater barrier net (210) are located on the top of the second filter assembly (218); and the seawater barrier net (210) is located at the water inlet end of the first circulation pipe (211) to extend the discharge time of seawater.

6. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 5, characterized in that: A redox potential sensor (208) is fixedly mounted on the top of the surface of the seawater filter (207), and a detection end of the redox potential sensor (208) penetrates into the inner cavity of the seawater filter (207).

7. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 6, characterized in that: A serpentine tube (220) is fixedly installed in the inner cavity of the seawater cooler (215); the water inlet end of the serpentine tube (220) is connected to the first circulation tube (211), and the water outlet end of the serpentine tube (220) is connected to the second circulation tube (216).

8. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 7, characterized in that: A plurality of vibration components (221) are fixedly mounted in the inner cavity of the seawater cooler (215), and the vibration ends of the vibration components (221) are located at the bending parts of the serpentine tube (220).

9. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 8, characterized in that: The inner cavity of the vibration component (221) is movably connected to a sliding member (223), one end of the sliding member (223) is fixedly connected to a spring (222), and one end of the spring (222) is fixedly connected to the inner wall of the vibration component (221).

10. The 220 kV oil-immersed transformer for low-frequency power transmission system according to claim 9, characterized in that: The other end of the sliding member (223) is respectively fixedly connected to a ceramic vibration plate (224) and a vibrating rod (225); the ceramic vibration plate (224) is sleeved on the surface of the vibrating rod (225); one end of the vibration component (221) is provided with a vibration head (226) movably connected to the serpentine tube (220); and the spherical end of the vibrating rod (225) is located in the inner cavity of the vibration head (226).

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