Insulating oil filtering device and method

Abstract

The embodiment of the application discloses an insulating oil filtering device and method, and relates to the technical field of transformer insulating oil processing. The insulating oil filtering device is characterized in that it comprises an oil inlet pipe, a first tank body, a second tank body, a hydrophobic filter element, a degassing membrane assembly and an oil outlet pipe. The first tank body has an inner cavity and a water collecting groove in communication with the inner cavity. The hydrophobic filter element is installed in the inner cavity and separates the inner cavity and the water collecting groove. The oil inlet pipe is in communication with the water collecting groove. The second tank body has a cavity. The degassing membrane assembly is installed in the cavity and separates the cavity into an oil storage cavity and a gas storage cavity. The inner cavity is in communication with the oil storage cavity. The oil outlet pipe is in communication with the oil storage cavity. The water and gas in the insulating oil are filtered by the hydrophobic filter element and the degassing membrane assembly. Compared with a conventional vacuum oil filter, the device has the advantages of low energy consumption, high efficiency and stable filtering effect.

Description

Technical Field

[0001] This invention relates to the field of transformer insulating oil treatment technology, and in particular to an insulating oil filtration device and method. Background Technology

[0002] The gas content of the insulating oil in a 500kV transformer should not exceed 3% during operation. While dissolved gases have little impact on transformer insulation under low electric field strength, they readily precipitate and accumulate under high electric field strength, forming bubbles under certain conditions. These bubbles adhere to the insulation surface or interior, becoming elongated and polarized, leading to main insulation breakdown, reduced insulation performance, and accelerated aging of the insulation materials, severely shortening the transformer's lifespan – an irreversible destructive process. With insulation aging, the probability of overheating and discharge faults in the main transformer increases. Excessive oxygen content in the oil also rapidly degrades the quality of the main insulating oil, reducing its safe service life. Therefore, it is crucial to strengthen the monitoring of the gas content in the insulating oil, analyze and resolve issues of excessive gas content, prevent equipment accidents, and minimize economic losses.

[0003] Currently, vacuum oil filters are widely used to degas insulating oil. However, after on-site testing, vacuum oil filters have the following problems: high-temperature heating damages the oil, high energy consumption, loud noise during operation, and oil leakage. Summary of the Invention

[0004] Therefore, it is necessary to provide an insulating oil filtration device and method to solve the problem that most of the current widely used vacuum oil filters are used to degas insulating oil. However, after on-site testing, vacuum oil filters have the following problems: high-temperature heating damages the oil, high energy consumption, loud noise during machine operation, and oil leakage from the vacuum oil filter.

[0005] In a first aspect, the present invention provides an insulating oil filtration device, comprising: an oil inlet pipe, a first tank, a second tank, a hydrophobic filter element, a degassing membrane assembly, and an oil outlet pipe. The first tank has an inner cavity and a water collection tank connected to the inner cavity. The hydrophobic filter element is installed in the inner cavity and separates the inner cavity from the water collection tank. The oil inlet pipe is connected to the water collection tank. The insulating oil enters the water collection tank from the oil inlet pipe. The hydrophobic filter element filters the water in the insulating oil into the water collection tank. The insulating oil enters the inner cavity. The second tank has a chamber. The degassing membrane assembly is installed in the chamber and divides the chamber into an oil storage chamber and a gas storage chamber. The inner cavity is connected to the oil storage chamber. The oil outlet pipe is connected to the oil storage chamber. The insulating oil in the inner cavity enters the oil storage chamber. The gas in the insulating oil passes through the degassing membrane assembly and enters the gas storage chamber. The insulating oil flows out from the oil outlet pipe.

[0006] In one embodiment, the hydrophobic filter element includes a fluorinated SiO2 particle superhydrophobic membrane and a metal mesh. The fluorinated SiO2 particle superhydrophobic membrane is permeable to the insulating oil, but moisture cannot pass through. The metal mesh supports the fluorinated SiO2 particle superhydrophobic membrane.

[0007] In one embodiment, the fluorinated SiO2 particle superhydrophobic film comprises a surface layer and a support layer. The surface layer is a nano-coating with a contact angle greater than 160 degrees. The support layer is a sand core or porous ceramic, loaded with Pd / Pt nanoparticles, and used for catalytic decomposition. Faulty gas.

[0008] In one embodiment, the first tank includes a first housing and a first cover disposed on the first housing. The insulating oil filter device further includes a first clamp that can clamp the first cover to the first housing and is used to detachably connect the first cover to the first housing for replacing the hydrophobic filter element.

[0009] In one embodiment, the insulating oil filtration device further includes a filter screen installed at the oil inlet and used to filter particulate impurities in the insulating oil.

[0010] The insulating oil filter device also includes a drain outlet, which is connected to the water collection tank and used for drainage.

[0011] In one embodiment, the degassing membrane assembly includes a Teflon AF superoleophobic membrane, a sand core, a first differential pressure sensor, and an RFID tag. The Teflon AF superoleophobic membrane allows the gas to pass through while the insulating oil cannot. The sand core supports the Teflon AF superoleophobic membrane. The first differential pressure sensor monitors whether the Teflon AF superoleophobic membrane is contaminated. The RFID tag records usage time and performance data.

[0012] In one embodiment, the insulating oil filtration device further includes a vacuum pump connected to the gas storage chamber and used to accelerate the permeation of the gas through the degassing membrane assembly.

[0013] In one embodiment, the insulating oil filtration device further includes an air backflushing assembly, which includes an air blowing element and a second differential pressure sensor. The air blowing element is connected to the outside and the air storage chamber and is used to blow air into the degassing membrane assembly. The second differential pressure sensor is installed in the air storage chamber and is used to monitor the differential pressure in the air storage chamber.

[0014] In one embodiment, the insulating oil filtration device further includes an ultrasonic enhancement component, which is installed in the oil storage chamber and used for ultrasonic-assisted removal of air bubbles from the insulating oil.

[0015] The insulating oil filtration device also includes a gas content sensor and a controller. The gas content sensor is used to monitor the gas content in the insulating oil. The controller controls the opening or closing of the oil outlet pipe according to the gas content. The ultrasonic strengthening component adjusts the power of the ultrasonic strengthening component according to the gas content.

[0016] The insulating oil filtration device further includes a circulation pipeline and a circulation pump. The circulation pipeline is connected to the oil storage chamber, and the circulation pump is installed in the circulation pipeline and is used to circulate the insulating oil in the oil storage chamber.

[0017] Secondly, the present invention also provides a method for filtering insulating oil, the method comprising the insulating oil filtering apparatus of any of the above embodiments, the method comprising the following steps:

[0018] The insulating oil enters the water collection tank from the oil inlet pipe. The insulating oil in the water collection tank passes through the hydrophobic filter element and enters the inner cavity through the hydrophobic filter element. The water in the insulating oil is retained in the water collection tank.

[0019] The insulating oil in the inner cavity enters the oil storage chamber, and the gas in the insulating oil passes through the degassing membrane assembly and enters the gas storage chamber.

[0020] Implementing the embodiments of the present invention will have the following beneficial effects:

[0021] The insulating oil filtration device and method of the present invention comprises a first tank having an inner cavity and a water collection tank connected to the inner cavity. A hydrophobic filter element is installed in the inner cavity, separating the inner cavity from the water collection tank. An oil inlet pipe is connected to the water collection tank, and insulating oil enters the water collection tank from the oil inlet pipe. The hydrophobic filter element filters the water in the insulating oil into the water collection tank, and the insulating oil enters the inner cavity. A second tank has a chamber, and a degassing membrane assembly is installed in the chamber, dividing the chamber into an oil storage chamber and a gas storage chamber. The inner cavity is connected to the oil storage chamber, and an oil outlet pipe is connected to the oil storage chamber. The insulating oil in the inner cavity enters the oil storage chamber, and the gas in the insulating oil passes through the degassing membrane assembly into the gas storage chamber. The insulating oil flows out from the oil outlet pipe. By setting up a hydrophobic filter element and a degassing membrane assembly, the water and gas in the insulating oil are filtered, which has the advantages of low energy consumption, high efficiency, and stable filtration effect compared with traditional vacuum oil filters. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] in:

[0024] Figure 1 This is an isometric schematic diagram of an insulating oil filter device in one embodiment.

[0025] Figure label:

[0026] 1. Oil inlet pipe;

[0027] 2. First tank body; 21. First shell; 22. First cover; 23. Inner cavity; 24. Water collection tank; 241. Drain outlet;

[0028] 3. Second tank body; 31. Chamber; 311. Oil storage chamber; 312. Gas storage chamber; 32. Second shell; 33. Second cover;

[0029] 4. Hydrophobic filter element;

[0030] 5. Degassing membrane assembly; 6. Oil outlet pipe; 7. First clamp; 8. Filter screen; 9. Vacuum pump; 91. Air backwash assembly; 92. Ultrasonic enhancement assembly; 93. Circulation pipeline; 94. Circulation pump; 95. Second clamp. Detailed Implementation

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

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0036] Please combine them together Figure 1 The insulating oil filtration device provided by the present invention will now be described.

[0037] The insulating oil filtration device includes: an oil inlet pipe 1, a first tank 2, a second tank 3, a hydrophobic filter element 4, a degassing membrane assembly 5, and an oil outlet pipe 6. The first tank 2 has an inner cavity 23 and a water collection tank 24 connected to the inner cavity 23. The hydrophobic filter element 4 is installed inside the inner cavity 23 and separates the inner cavity 23 from the water collection tank 24. The oil inlet pipe 1 connects to the water collection tank 24. Insulating oil enters the water collection tank 24 from the oil inlet pipe 1. The hydrophobic filter element 4 filters the water in the insulating oil into the water collection tank. In the water tank 24, insulating oil enters the inner cavity 23. The second tank 3 has a chamber 31. The degassing membrane assembly 5 is installed in the chamber 31 and divides the chamber 31 into an oil storage chamber 311 and a gas storage chamber 312. The inner cavity 23 is connected to the oil storage chamber 311, and the oil outlet pipe 6 is connected to the oil storage chamber 311. The insulating oil in the inner cavity 23 enters the oil storage chamber 311, and the gas in the insulating oil enters the gas storage chamber 312 through the degassing membrane assembly 5. The insulating oil flows out from the oil outlet pipe 6.

[0038] It is understood that the first tank 2 of the insulating oil filtration device has an inner cavity 23 and a water collection tank 24 connected to the inner cavity 23. The hydrophobic filter element 4 is installed in the inner cavity 23 and separates the inner cavity 23 and the water collection tank 24. The oil inlet pipe 1 is connected to the water collection tank 24. The insulating oil enters the water collection tank 24 from the oil inlet pipe 1. The hydrophobic filter element 4 filters the water in the insulating oil into the water collection tank 24. The insulating oil enters the inner cavity 23. The second tank 3 has a chamber 31. The degassing membrane assembly 5 is installed in the chamber 31 and divides the chamber 31 into an oil storage chamber 311 and a gas storage chamber 312. The inner cavity 23 is connected to the oil storage chamber 311. The oil outlet pipe 6 is connected to the oil storage chamber 311. The insulating oil in the inner cavity 23 enters the oil storage chamber 311. The gas in the insulating oil enters the gas storage chamber 312 through the degassing membrane assembly 5. The insulating oil flows out from the oil outlet pipe 6. By setting up a hydrophobic filter element 4 and a degassing membrane assembly 5, the moisture and gas in the insulating oil can be filtered out. Compared with traditional vacuum oil filters, it has the advantages of low energy consumption, high efficiency and stable filtration effect.

[0039] In other embodiments, one or more intermediate processing tanks are added between the first tank 2 and the second tank 3. Each intermediate processing tank is equipped with a hydrophobic filter element 4 or a degassing membrane assembly 5 with different pore sizes or materials to achieve multi-stage filtration and degassing, thereby further improving the purity of the insulating oil.

[0040] In further optimization of the degassing membrane module 5, hollow fiber membrane bundles can be used to replace the flat sheet membrane structure. The hollow fiber membrane material is oleophobic polypropylene or polyvinylidene fluoride, with thousands of hollow fibers arranged in parallel, significantly increasing the effective degassing area and improving degassing efficiency. The two ends of the membrane bundle are encapsulated in the tube sheet with epoxy resin to form a compact membrane contactor. This structure is particularly suitable for applications with large throughput or limited space.

[0041] In this embodiment, the hydrophobic filter element 4 includes a fluorinated SiO2 particle superhydrophobic membrane and a metal mesh. The fluorinated SiO2 particle superhydrophobic membrane allows insulating oil to pass through while preventing moisture from passing through. This filters out moisture from the insulating oil. The metal mesh supports the fluorinated SiO2 particle superhydrophobic membrane, thereby increasing its support.

[0042] Furthermore, the hydrophobic filter element 4 is not limited to a combination structure of a fluorinated SiO2 particle superhydrophobic membrane and a metal mesh. As an alternative, a composite structure of a carbon nanotube-coated superhydrophobic membrane and a stainless steel sintered mesh can be used, wherein the carbon nanotube coating is formed on the surface of the stainless steel sintered mesh through chemical vapor deposition, resulting in higher mechanical strength and chemical corrosion resistance. Alternatively, the hydrophobic filter element can also use a PTFE (polytetrafluoroethylene) composite hydrophobic membrane, which is formed by hot-pressing a PTFE microporous membrane and a non-woven fabric support layer, exhibiting excellent oil throughput and water retention.

[0043] Furthermore, the fluorine-containing SiO2 particle superhydrophobic film comprises a surface layer and a support layer. The surface layer is a nano-coating with a contact angle greater than 160 degrees, thus preventing moisture wetting. The support layer is a sand core or porous ceramic, increasing mechanical strength and compressive strength. It also supports Pd / Pt nanoparticles for catalytic decomposition. Faulty gas.

[0044] Furthermore, the first tank 2 includes a first shell 21 and a first cover 22 covering the first shell 21. The insulating oil filter device also includes a first clamp 7, which can clamp the first cover 22 to the first shell 21 and is used to detachably connect the first cover 22 to the first shell 21 for replacing the hydrophobic filter element 4. Specifically, the first cover 22 and the first shell 21 are detachable, so that the hydrophobic filter element 4 can be replaced, specifically replacing the fluorinated SiO2 particle superhydrophobic membrane, with the metal mesh fixed inside the inner cavity 23.

[0045] Furthermore, the insulating oil filtration device also includes a filter screen 8, which is installed at the oil inlet and used to filter particulate impurities in the insulating oil. This ensures that particulate impurities in the insulating oil can be effectively filtered.

[0046] The insulating oil filtration device also includes a drain outlet 241, which is connected to the water collection tank 24 and used for drainage. After the insulating oil filtration is completed, the drain outlet 241 is opened to allow the water in the water collection tank 24 to be drained.

[0047] In one embodiment, continue as follows Figure 1 As shown, the degassing membrane assembly 5 includes a Teflon AF superoleophobic film, a sand core, a first differential pressure sensor, and an RFID tag. The Teflon AF superoleophobic film allows gas to pass through, but the insulating oil cannot. This filters gas from the insulating oil. The sand core supports the Teflon AF superoleophobic film, improving its support. The first differential pressure sensor monitors whether the Teflon AF superoleophobic film is contaminated. If contamination is detected, the sensor prompts for replacement. The RFID tag records usage time and performance data, facilitating the recording of the Teflon AF superoleophobic film's usage duration and performance.

[0048] In this embodiment, the second tank 3 includes a second housing 32 and a second cover 33 covering the second housing 32. The insulating oil filter device also includes a second clamp 95, which can clamp the second cover 33 to the second housing 32 and is used to detachably connect the second cover 33 to the second housing 32 for replacing the degassing membrane assembly 5. Specifically, the second cover 33 and the second housing 32 are detachable, allowing the degassing membrane assembly 5 to be replaced, specifically by replacing the Teflon AF superoleophobic membrane, with the sand core fixed inside the chamber 31.

[0049] Furthermore, the insulating oil filtration device also includes a vacuum pump 9, which is connected to the gas storage chamber 312 and is used to accelerate the permeation of gas through the degassing membrane assembly 5. By setting the vacuum pump 9, a negative pressure is generated in the gas storage chamber 312, thereby accelerating the permeation of gas in the insulating oil through the degassing membrane assembly 5. In addition, the gas in the gas storage chamber 312 can also be discharged through the vacuum pump 9.

[0050] Furthermore, the insulating oil filtration device also includes an air backflushing assembly 91. The air backflushing assembly 91 includes an air blowing component and a second differential pressure sensor. The air blowing component is connected to the outside environment and the air storage chamber 312, and is used to blow air onto the degassed membrane assembly 5. The second differential pressure sensor is installed inside the air storage chamber 312 and is used to monitor the pressure difference within the air storage chamber 312. Specifically, the air blowing component can be an air pump, which can periodically blow air onto the degassed membrane assembly 5 to flush the membrane surface and prevent membrane contamination. The flushing cycle is triggered by the second differential pressure sensor. Alternatively, when the insulating oil filtration device is not in use, the degassed membrane assembly 5 can be manually blew air periodically.

[0051] Furthermore, the insulating oil filtration device also includes an ultrasonic enhancement component 92, which is installed in the oil storage chamber 311 and used for ultrasonic-assisted removal of air bubbles from the insulating oil. The ultrasonic enhancement component 92 includes multiple ultrasonic probes, the operating frequencies of which are from 20 kHz to 100 kHz. The ultrasonic enhancement component 92 assists in removing air bubbles from the insulating oil.

[0052] In other embodiments, a low-temperature heater is installed in the oil storage chamber 311 to control the oil temperature between 40 and 60 degrees Celsius, reducing the oil viscosity without damaging the oil and promoting gas escape. This assists in the degassing process and is particularly suitable for insulating oils with high viscosity in low-temperature environments.

[0053] Furthermore, the insulating oil filtration device also includes a gas content sensor and a controller. The gas content sensor monitors the gas content in the insulating oil, and the controller controls the opening or closing of the oil outlet pipe 6 based on the gas content. The ultrasonic strengthening component 92 adjusts its power according to the gas content. The gas content sensor periodically measures the gas content in the insulating oil within the oil storage chamber 311. If the gas content meets the requirements, it feeds the data back to the controller, stops the filtration process, and opens the oil outlet pipe 6 to discharge oil. In addition, the gas content sensor is linked to the ultrasonic strengthening component 92, dynamically adjusting the power of the ultrasonic strengthening component 92 according to the gas concentration in the insulating oil.

[0054] Furthermore, the insulating oil filtration device also includes a circulation pipeline 93 and a circulation pump 94. The circulation pipeline 93 connects to the oil storage chamber 311, and the circulation pump 94 is installed in the circulation pipeline 93 and is used to circulate the insulating oil in the oil storage chamber 311. Turning on the circulation pump 94 allows the insulating oil in the oil storage chamber 311 to circulate in the circulation pipeline 93, promoting the flow of the insulating oil and better contact with the surface of the degassing membrane assembly 5, thereby avoiding inconsistent gas content in the upper and lower insulating oil within the oil storage chamber 311.

[0055] The present invention also provides a method for filtering insulating oil, which includes the insulating oil filtering device of any of the above embodiments, and the method includes the following steps:

[0056] Insulating oil enters the water collection tank 24 from the oil inlet pipe 1. The insulating oil in the water collection tank 24 passes through the hydrophobic filter element 4 and enters the inner cavity 23 through the hydrophobic filter element 4. The water in the insulating oil is retained in the water collection tank 24.

[0057] The insulating oil in the inner cavity 23 enters the oil storage cavity 311, and the gas in the insulating oil enters the gas storage cavity 312 through the degassing membrane assembly 5.

[0058] It is understandable that by using the invented insulating oil filtration method, which sets up a hydrophobic filter element 4 and a degassing membrane assembly 5, the moisture and gas in the insulating oil can be filtered out. Compared with traditional vacuum oil filters, it has the advantages of low energy consumption, high efficiency and stable filtration effect.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An insulating oil filtration device, characterized in that, include: The system comprises an oil inlet pipe, a first tank, a second tank, a hydrophobic filter element, a degassing membrane assembly, and an oil outlet pipe. The first tank has an inner cavity and a water collection tank connected to the inner cavity. The hydrophobic filter element is installed in the inner cavity and separates the inner cavity from the water collection tank. The oil inlet pipe is connected to the water collection tank. The insulating oil enters the water collection tank from the oil inlet pipe. The hydrophobic filter element filters the water in the insulating oil into the water collection tank. The filtered insulating oil enters the inner cavity. The second tank has a chamber. The degassing membrane assembly is installed in the chamber and divides the chamber into an oil storage chamber and a gas storage chamber. The inner cavity is connected to the oil storage chamber. The oil outlet pipe is connected to the oil storage chamber. The insulating oil in the inner cavity enters the oil storage chamber. The gas in the insulating oil passes through the degassing membrane assembly and enters the gas storage chamber. The insulating oil flows out from the oil outlet pipe. The degassing membrane assembly includes a Teflon AF superoleophobic membrane, a sand core, a first differential pressure sensor, and an RFID tag. The Teflon AF superoleophobic membrane allows the gas to pass through, but the insulating oil cannot. The sand core supports the Teflon AF superoleophobic membrane. The first differential pressure sensor monitors whether the Teflon AF superoleophobic membrane is contaminated. The RFID tag records usage time and performance data.

2. The insulating oil filtration device according to claim 1, characterized in that, The hydrophobic filter element includes a fluorinated SiO2 particle superhydrophobic membrane and a metal mesh. The fluorinated SiO2 particle superhydrophobic membrane is permeable to the insulating oil, but moisture cannot pass through. The metal mesh supports the fluorinated SiO2 particle superhydrophobic membrane.

3. The insulating oil filtration device according to claim 2, characterized in that, The fluorine-containing SiO2 particle superhydrophobic film includes a surface layer and a support layer. The surface layer is a nano-coating with a contact angle greater than 160 degrees. The support layer is a sand core or porous ceramic, loaded with Pd / Pt nanoparticles, and used for catalytic decomposition of C2H2 fault gas.

4. The insulating oil filtration device according to claim 1, characterized in that, The first tank includes a first housing and a first cover covering the first housing. The insulating oil filter device also includes a first clamp, which can clamp the first cover to the first housing and is used to detachably connect the first cover to the first housing for replacing the hydrophobic filter element.

5. The insulating oil filtration device according to claim 1, characterized in that, The insulating oil filtration device also includes a filter screen, which is installed on the oil inlet pipe and is used to filter particulate impurities in the insulating oil. The insulating oil filter device also includes a drain outlet, which is connected to the water collection tank and used for drainage.

6. The insulating oil filtration device according to claim 1, characterized in that, The insulating oil filtration device also includes a vacuum pump, which is connected to the gas storage chamber and is used to accelerate the permeation of the gas through the degassing membrane assembly.

7. The insulating oil filtration device according to claim 1, characterized in that, The insulating oil filtration device further includes an air backflushing assembly, which includes an air blowing element and a second differential pressure sensor. The air blowing element is connected to the outside and the air storage chamber and is used to blow air into the degassing membrane assembly. The second differential pressure sensor is installed in the air storage chamber and is used to monitor the differential pressure in the air storage chamber.

8. The insulating oil filtration device according to claim 1, characterized in that, The insulating oil filtration device further includes an ultrasonic enhancement component, which is installed in the oil storage chamber and is used for ultrasonic-assisted removal of air bubbles from the insulating oil. The insulating oil filtration device also includes a gas content sensor and a controller. The gas content sensor is used to monitor the gas content in the insulating oil. The controller controls the opening or closing of the oil outlet pipe according to the gas content. The ultrasonic strengthening component adjusts the power of the ultrasonic strengthening component according to the gas content. The insulating oil filtration device further includes a circulation pipeline and a circulation pump. The circulation pipeline is connected to the oil storage chamber, and the circulation pump is installed in the circulation pipeline and is used to circulate the insulating oil in the oil storage chamber.

9. A method for filtering insulating oil, characterized in that, The insulating oil filtration method includes the insulating oil filtration device as described in any one of claims 1-8, and the method includes the following steps: The insulating oil enters the water collection tank from the oil inlet pipe. The insulating oil in the water collection tank passes through the hydrophobic filter element and enters the inner cavity through the hydrophobic filter element. The water in the insulating oil is retained in the water collection tank. The insulating oil in the inner cavity enters the oil storage chamber, and the gas in the insulating oil passes through the degassing membrane assembly and enters the gas storage chamber.

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