Transformer on-site oil filtering system integrated with super-hydrophobic oleophylic membrane

Abstract

The invention discloses a transformer on-site oil filtering system integrated with a super-hydrophobic oleophylic membrane, and belongs to the technical field of electrical equipment maintenance, the transformer on-site oil filtering system comprises: a super-hydrophobic oleophylic membrane unit, the super-hydrophobic oleophylic membrane unit is composed of at least one layer of super-hydrophobic oleophylic membrane, and is used for removing moisture and impurities in transformer oil through an oil-water separation mechanism; the oil filtering device main body is integrally provided with the super-hydrophobic oleophylic membrane unit and comprises an oil liquid inlet, an oil liquid outlet and a flow channel structure, and the flow channel structure is arranged to guide transformer oil to flow through the super-hydrophobic oleophylic membrane unit. According to the invention, the selective wettability of the super-hydrophobic oleophylic membrane is utilized, oil and oleophylic can smoothly pass through, water is repelled by a hydrophobic surface, impurities combined with the water are intercepted, physical separation is realized, a new technical path is provided for on-site oil filtration, and an efficient and accurate oil-water separation scheme different from a traditional centrifugation and adsorption principle is provided.

Description

Technical Field

[0001] This invention belongs to the field of power equipment maintenance technology, specifically relating to a transformer on-site oil filtration system and method based on a superhydrophobic and oleophilic membrane. Background Technology

[0002] Transformers are core equipment in power systems, and the quality of their insulating oil directly affects their insulation performance and service life. During long-term operation, transformer oil can accumulate impurities such as moisture, acidic substances, and solid particles due to aging and dampness, leading to a decline in its insulation performance and threatening power grid safety. Oil-impregnated paper insulation is the most common form of insulation in transformers, and its condition largely determines the overall service life of the transformer. During long-term operation, transformer oil can accumulate moisture, dissolved gases, or other particulate impurities due to aging, severely reducing the insulation performance of power transformers. Traditional transformer oil purification methods mainly include pressure filtration, vacuum filtration, and adsorption regeneration.

[0003] Patent publication number CN106914145B discloses a superhydrophobic and superoleophilic filter membrane, comprising a porous mesh substrate, an amorphous carbon film deposited on the surface of the porous mesh substrate, silica modified on the outer side of the amorphous carbon film, and a hydrophobic layer modified on the surface of the silica. The invention also discloses its preparation method: baking the surface of the porous mesh substrate to deposit the amorphous carbon film; using vapor deposition to hydrolyze the precursor under the action of a catalyst to obtain silica and deposit the silica onto the surface of the porous mesh substrate; treating the surface of the porous mesh substrate with a hydrophobic treatment agent. This invention also claims a filtration method for a superhydrophobic and superoleophilic filter membrane: providing a fluid delivery pipe, the sidewall of which is made of a superhydrophobic and superoleophilic filter membrane; introducing the oil-water mixture to be separated from the inlet end of the fluid delivery pipe and allowing it to flow along the fluid delivery pipe; collecting the separated oil and water from the bottom and outlet ends of the fluid delivery pipe, respectively. However, how to successfully apply superhydrophobic materials to the specific scenario of transformer oil, solve problems such as mechanical strength, long-term stability, and field adaptability, and integrate a complete field oil filtration system remains a technical challenge that needs to be addressed.

[0004] While these current transformer oil purification methods are widely used, they have obvious limitations: they are not very effective at removing trace amounts of dissolved water, acidic products, and submicron particles from the oil; and they are usually lengthy, energy-intensive, and have complex equipment, making them inconvenient for efficient on-site operation and maintenance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a transformer on-site oil filtration system and method based on a superhydrophobic oleophilic membrane, which achieves efficient and precise purification of transformer oil, especially the deep removal of trace amounts of moisture. At the same time, it is easy to operate and suitable for on-site operations, thus solving the technical problems mentioned in the background art.

[0006] The objective of this invention is achieved as follows: an integrated superhydrophobic and oleophilic membrane transformer on-site oil filtration system, comprising: a superhydrophobic and oleophilic membrane unit, wherein the superhydrophobic and oleophilic membrane unit is composed of at least one superhydrophobic and oleophilic thin film, used to remove water and impurities from transformer oil through an oil-water separation mechanism; and an oil filtration device body, wherein the oil filtration device body integrates the superhydrophobic and oleophilic membrane unit and includes an oil inlet, an oil outlet, and a flow channel structure, wherein the flow channel structure is configured to guide the transformer oil through the superhydrophobic and oleophilic membrane unit. Utilizing the selective wettability of the superhydrophobic and oleophilic membrane, the oil (oleophilic) can pass through smoothly, while water (repelled by the hydrophobic surface) and impurities bound to it are retained, achieving physical separation. In use, transformer oil enters the oil filtration device body from the oil inlet and is forced through the superhydrophobic and oleophilic membrane unit under the guidance of the flow channel structure. After oil-water separation is completed on the membrane surface, the purified oil is discharged from the oil outlet. This provides a highly efficient and precise oil-water separation solution that differs from traditional centrifugation and adsorption principles, offering a new technical path for on-site oil filtration.

[0007] Furthermore, the superhydrophobic and oleophilic film is made of one or more of the following materials that have undergone surface modification treatment: polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, or polyethersulfone, and the water contact angle of the film is greater than 150°. The surface modification treatment involves constructing a micro / nano rough structure on the surface of the superhydrophobic and oleophilic film using nano-silica, titanium dioxide, or zinc oxide particles. By constructing a micro / nano rough structure on the surface, combined with the material's inherent low surface energy, the water contact angle is significantly increased (>150°), enhancing the superhydrophobic effect; while retaining affinity for oils. On a polymer substrate such as PTFE, nano-particles of SiO2 are fixed by spraying or sintering to form micro-roughness, ensuring that the film possesses stable and excellent superhydrophobic and oleophilic properties.

[0008] Furthermore, the superhydrophobic and oleophilic membrane unit is a multilayer composite structure, comprising at least two layers of the superhydrophobic and oleophilic membrane combined in a stacked or sandwich manner. Different layers have different average pore sizes to achieve gradient filtration. In the multilayer composite structure, the pore size of the superhydrophobic and oleophilic membrane decreases layer by layer along the oil inflow direction. The large-pore layer first intercepts large particles of impurities, protecting the finer layers; the small-pore layer is responsible for deep removal of fine moisture and impurities, working together to avoid rapid clogging of a single membrane. By assembling membranes with different average pore sizes in descending order of pore size (along the oil inflow direction) into a membrane unit, and combining the multilayer membranes in a "gradient filtration" manner for transformer oil treatment, the filtration process is optimized, significantly improving contamination capacity and filtration efficiency, extending membrane lifespan, and system continuous operating time.

[0009] Furthermore, the multilayer composite structure is prepared by electrospinning, sol-gel method, or chemical vapor deposition to enhance the tensile strength of the film. Methods such as electrospinning allow for precise control of fiber diameter and pore structure, thereby producing film materials with enhanced mechanical properties. This improves the mechanical strength (e.g., tensile strength) and durability (cycle life) of the membrane product, solving the technical challenge of membrane damage and ensuring the reliability of the system in the field environment.

[0010] Furthermore, the main body of the oil filtration device also includes a pressure control module, a flow rate regulation module, a pretreatment module, and a monitoring module. The pressure control module is configured to maintain the oil pressure between 0.1-0.5 MPa; the flow rate regulation module is configured to control the oil flow rate within the range of 1-10 L / min; the pretreatment module is located between the oil inlet and the superhydrophobic oleophilic membrane unit, and is used to preheat and coarsely filter the incoming transformer oil, with the preheating temperature being 40℃ to 60℃; the monitoring module is used to monitor the performance parameters of the filtered transformer oil in real time, including at least one of water content, breakdown voltage, and dielectric loss factor. The filtration kinetics are optimized through pressure / flow rate control; the filtration flux is increased by reducing oil viscosity through preheating; and process quality control is achieved through online monitoring. During system operation, the modules work collaboratively: the pretreatment module heats / coarsely filters, the pressure / flow rate module regulates the operating conditions of the membrane unit, and the monitoring module provides real-time feedback of oil quality data, integrating multiple auxiliary functional modules with the core membrane unit into an intelligent and automated system. This achieves optimal control of the filtration process, ensuring stable and reliable oil filtration quality.

[0011] Furthermore, the main body of the oil filtration device also includes a backwashing pipeline for introducing clean oil flow to backwash the superhydrophobic and oleophilic membrane unit, thereby removing contaminants from the membrane surface. During or after filtration, clean oil is introduced in reverse flow, using shear force to flush away contaminants adhering to the membrane surface, achieving physical cleaning. In practice, the backwashing pipeline valve is operated to change the oil flow direction and flush the membrane unit. Integrating the backwashing function into the superhydrophobic and oleophilic membrane unit in the transformer oil filtration system significantly extends the manual maintenance cycle of the membrane unit and reduces long-term operating costs.

[0012] A method for on-site transformer oil filtration using a superhydrophobic oleophilic membrane includes the following steps: providing an on-site transformer oil filtration system with an integrated superhydrophobic oleophilic membrane as described above; connecting the system to a transformer oil filtration pipeline, allowing transformer oil to flow in from the oil inlet and through the superhydrophobic oleophilic membrane unit; separating water and impurities in the oil through the superhydrophobic oleophilic membrane unit, and discharging the treated oil from the oil outlet; monitoring insulation performance parameters during the oil filtration process, and optimizing the oil filtration operation based on feedback.

[0013] Furthermore, before filtering the oil, a preliminary step is included, which involves preheating the transformer oil at a temperature controlled between 40°C and 60°C to reduce the oil viscosity.

[0014] Furthermore, the superhydrophobic and oleophilic film unit is selected or its structure is adjusted according to the form of water in the transformer oil for oil-water separation; the selection or combination of forms includes suspended, emulsified, or dissolved forms.

[0015] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described above, wherein the storage medium is disposed in a control unit of the oil filtration system or a mobile device communicatively connected thereto, for controlling the automated operation of the oil filtration system.

[0016] The beneficial effects of this invention are as follows: Utilizing the selective separation characteristics of superhydrophobic and oleophilic membranes, it can efficiently remove trace amounts of water and colloidal particles, as well as other difficult-to-treat impurities, from transformer oil. It precisely removes trace amounts of dissolved water, acidic products, and submicron-sized particles from the oil. The equipment is simple, energy-efficient, and facilitates efficient on-site operation and maintenance. It significantly improves the breakdown voltage and insulation performance of the oil, and the purification effect is far superior to traditional methods. The superhydrophobic membrane technology is highly integrated with pretreatment, control, and monitoring modules to form a complete and compact system, particularly suitable for online oil filtration operations in transformer sites, reducing equipment transportation and installation costs. Real-time online monitoring evaluates the filtration effect, ensuring process control. The backwashing design effectively alleviates the technical problem of membrane fouling, significantly extending the service life of the core membrane unit and reducing operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system architecture of the present invention;

[0018] Figure 2 This is a flowchart of the method steps of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that this is only for the purpose of more clearly illustrating and explaining the present invention.

[0020] Example 1

[0021] like Figure 1 and 2 As shown, this embodiment discloses a transformer on-site oil filtration system integrating a superhydrophobic and oleophilic membrane, comprising: a superhydrophobic and oleophilic membrane unit, which is composed of at least one superhydrophobic and oleophilic thin film, used to remove water and impurities from transformer oil through an oil-water separation mechanism; and an oil filtration device body, which integrates the superhydrophobic and oleophilic membrane unit and includes an oil inlet, an oil outlet, and a flow channel structure, wherein the flow channel structure is configured to guide the transformer oil through the superhydrophobic and oleophilic membrane unit. Utilizing the selective wettability of the superhydrophobic and oleophilic membrane, the oil (oleophilic) can pass through smoothly, while water (repelled by the hydrophobic surface) and impurities bound to it are retained, achieving physical separation. In use, transformer oil enters the oil filtration device body from the oil inlet and is forced through the superhydrophobic and oleophilic membrane unit under the guidance of the flow channel structure. After oil-water separation is completed on the membrane surface, the purified oil is discharged from the oil outlet. This provides a highly efficient and precise oil-water separation solution different from traditional centrifugation and adsorption principles, offering a new technical path for on-site oil filtration.

[0022] Example 2

[0023] like Figure 1 and 2As shown, this embodiment discloses a transformer on-site oil filtration system integrating a superhydrophobic and oleophilic membrane, comprising: a superhydrophobic and oleophilic membrane unit, which is composed of at least one superhydrophobic and oleophilic thin film, used to remove water and impurities from transformer oil through an oil-water separation mechanism; and an oil filtration device body, which integrates the superhydrophobic and oleophilic membrane unit and includes an oil inlet, an oil outlet, and a flow channel structure, wherein the flow channel structure is configured to guide the transformer oil through the superhydrophobic and oleophilic membrane unit. Utilizing the selective wettability of the superhydrophobic and oleophilic membrane, the oil (oleophilic) can pass through smoothly, while water (repelled by the hydrophobic surface) and impurities bound to it are retained, achieving physical separation. In use, transformer oil enters the oil filtration device body from the oil inlet and is forced through the superhydrophobic and oleophilic membrane unit under the guidance of the flow channel structure. After oil-water separation is completed on the membrane surface, the purified oil is discharged from the oil outlet. This provides a highly efficient and precise oil-water separation solution different from traditional centrifugation and adsorption principles, offering a new technical path for on-site oil filtration.

[0024] In this embodiment, the superhydrophobic and oleophilic film is made of one or more of the following materials that have undergone surface modification treatment: polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, or polyethersulfone, and the surface water contact angle of the film is greater than 150°. The surface modification treatment involves constructing a micro-nano rough structure on the surface of the superhydrophobic and oleophilic film using nano-silica, titanium dioxide, or zinc oxide particles. By constructing a micro-nano rough structure on the surface, combined with the low surface energy of the material itself, the water contact angle is significantly increased (>150°), enhancing the superhydrophobic effect; while retaining the affinity for oil. On a polymer substrate such as PTFE, nano-particles of SiO2 are fixed by spraying or sintering to form micro-roughness, ensuring that the film possesses stable and excellent superhydrophobic and oleophilic properties.

[0025] In this embodiment, the superhydrophobic and oleophilic membrane unit is a multilayer composite structure, comprising at least two layers of the superhydrophobic and oleophilic membrane combined in a stacked or sandwich manner. Different layers have different average pore sizes to achieve gradient filtration. Furthermore, in the multilayer composite structure, the pore size of the superhydrophobic and oleophilic membrane decreases layer by layer along the oil inflow direction. The large-pore layer first intercepts large particles of impurities, protecting the finer layers; the small-pore layer is responsible for deep removal of fine moisture and impurities, working together to avoid rapid clogging of a single membrane. By assembling membranes with different average pore sizes in descending order of pore size (along the oil inflow direction) into a membrane unit, and combining the multilayer membranes in a "gradient filtration" manner for transformer oil treatment, the filtration process is optimized, significantly improving contamination capacity and filtration efficiency, extending membrane lifespan, and system continuous operating time.

[0026] In this embodiment, the multilayer composite structure is prepared by electrospinning, sol-gel method, or chemical vapor deposition to enhance the tensile strength of the film. Methods such as electrospinning allow for precise control of fiber diameter and pore structure, thereby producing film materials with enhanced mechanical properties. This improves the mechanical strength (e.g., tensile strength) and durability (cycle life) of the membrane product, solving the technical challenge of membrane damage and ensuring the reliability of the system in the field environment.

[0027] In this embodiment, the main body of the oil filtration device further includes a pressure control module, a flow rate regulation module, a pretreatment module, and a monitoring module. The pressure control module is configured to maintain the oil pressure between 0.1 and 0.5 MPa. The flow rate regulation module is configured to control the oil flow rate within the range of 1-10 L / min. The pretreatment module is located between the oil inlet and the superhydrophobic oleophilic membrane unit, and is used to preheat and coarsely filter the incoming transformer oil. The preheating temperature is 40°C to 60°C. The monitoring module is used to monitor the performance parameters of the transformer oil after filtration in real time. The performance parameters include at least one of water content, breakdown voltage, and dielectric loss factor. Filtration kinetics are optimized through pressure / flow rate control; filtration flux is increased by reducing oil viscosity through preheating; and process quality control is achieved through online monitoring. During system operation, the modules work collaboratively: the pretreatment module heats / coarsely filters, the pressure / flow rate module regulates the operating conditions of the membrane unit, and the monitoring module provides real-time feedback of oil quality data. Multiple auxiliary functional modules are integrated with the core membrane unit into an intelligent and automated system. This achieves optimal control of the filtration process and ensures stable and reliable oil filtration quality.

[0028] In this embodiment, the main body of the oil filtration device also includes a backwashing pipeline for introducing clean oil flow to backwash the superhydrophobic and oleophilic membrane unit, thereby removing contaminants from the membrane surface. During or after filtration, clean oil is introduced in reverse flow, using shear force to flush away contaminants adhering to the membrane surface, achieving physical cleaning. In practice, the backwashing pipeline valve is operated to change the oil flow direction and flush the membrane unit. Integrating the backwashing function into the superhydrophobic and oleophilic membrane unit within the transformer oil filtration system significantly extends the manual maintenance cycle of the membrane unit and reduces long-term operating costs.

[0029] A method for on-site transformer oil filtration using a superhydrophobic oleophilic membrane includes the following steps: providing an on-site transformer oil filtration system with an integrated superhydrophobic oleophilic membrane as described above; connecting the system to a transformer oil filtration pipeline, allowing transformer oil to flow in from the oil inlet and through the superhydrophobic oleophilic membrane unit; separating water and impurities in the oil through the superhydrophobic oleophilic membrane unit, and discharging the treated oil from the oil outlet; monitoring insulation performance parameters during the oil filtration process, and optimizing the oil filtration operation based on feedback.

[0030] In this embodiment, a preliminary step is included before oil filtration, which involves preheating the transformer oil at a temperature controlled between 40°C and 60°C to reduce the oil viscosity.

[0031] In this embodiment, the superhydrophobic and oleophilic film unit is selected or its structure is adjusted according to the form of water in the transformer oil for oil-water separation; the selection or combination of forms includes suspended, emulsified, or dissolved water.

[0032] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described above, wherein the storage medium is disposed in a control unit of the oil filtration system or a mobile device communicatively connected thereto, for controlling the automated operation of the oil filtration system.

[0033] In implementation, the system includes a main oil filtration unit, a superhydrophobic and oleophilic membrane unit, a pretreatment module, a pressure and flow rate control module, an online monitoring module, and backwashing piping. The main oil filtration unit is made of oil-resistant metal or high-strength engineering plastic, with internal meandering flow channels to increase the contact time between the oil and the membrane unit. The superhydrophobic and oleophilic membrane unit is fixed in the flow channel using a snap-fit ​​design for easy replacement. This membrane unit has a three-layer composite structure: the oil-facing surface is a PTFE membrane with a relatively large average pore size to intercept larger particles; the middle layer is a PVDF membrane with a moderate pore size; and the oil-exit surface is an ultra-fine PVDF membrane modified with SiO2 nanoparticles, with the smallest average pore size and a water contact angle of up to 158°. This gradient structure effectively prevents rapid clogging of the membrane pores. The pretreatment module includes a heater and a coarse filter, which preheats the oil from the transformer to 50°C and filters out visible impurities. The pressure and flow rate control module consists of a variable frequency oil pump and a regulating valve, which stably controls the oil flow rate at 5 L / min and maintains the pressure at 0.3 MPa. The online monitoring module includes a microwave-based trace moisture sensor and a portable breakdown voltage tester, which displays the water content and breakdown voltage of the purified oil in real time. The backflushing pipeline is connected to a clean oil tank and can be automatically or manually opened for backflushing when the system pressure differential increases.

[0034] After pretreatment, the transformer oil enters the main body of the oil filtration unit and flows through the superhydrophobic and oleophilic membrane unit. The oil passes smoothly, and moisture is effectively retained. After the purified oil meets the monitoring standards, it is returned to the transformer. The oil filtration is considered complete when the monitoring data shows that the breakdown voltage is stable above 50kV. During filtration, firstly, the system inlet and outlet are connected to the transformer valves via hoses. Then, the system is started, the preheating temperature is set to 50℃, and the flow rate is 5L / min. After the system is running, the operator can observe the oil quality changes through the monitoring module. After filtration, the backwashing function is activated for 5 minutes; the entire process is efficient and convenient.

[0035] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A transformer on-site oil filtration system integrating a superhydrophobic and oleophilic membrane, characterized in that, include: A superhydrophobic and oleophilic film unit, which is composed of at least one superhydrophobic and oleophilic film, is used to remove water and impurities from transformer oil through an oil-water separation mechanism. The main body of the oil filtration device integrates the superhydrophobic and oleophilic membrane unit and includes an oil inlet, an oil outlet, and a flow channel structure. The flow channel structure is configured to guide transformer oil through the superhydrophobic and oleophilic membrane unit.

2. The transformer on-site oil filtration system with integrated superhydrophobic and oleophilic membrane according to claim 1, characterized in that, The superhydrophobic and oleophilic film is made of one or more of polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile or polyethersulfone that have undergone surface modification treatment, and the surface water contact angle of the film is greater than 150°; the surface modification treatment is to construct a micro-nano rough structure on the surface of the superhydrophobic and oleophilic film using nano-silica, titanium dioxide or zinc oxide particles.

3. The transformer field oil filtration system with integrated superhydrophobic and oleophilic membrane according to claim 1 or 2, characterized in that, The superhydrophobic and oleophilic membrane unit is a multilayer composite structure, comprising at least two layers of the superhydrophobic and oleophilic membrane combined in a stacked or sandwich manner. The membranes of different layers have different average pore sizes to achieve gradient filtration. In the multilayer composite structure, the pore size of the superhydrophobic and oleophilic membrane decreases layer by layer along the oil inflow direction.

4. The transformer on-site oil filtration system with integrated superhydrophobic and oleophilic membrane according to claim 3, characterized in that, The multilayer composite structure is prepared by electrospinning, sol-gel method or chemical vapor deposition method, and is used to enhance the tensile strength of the film.

5. The transformer on-site oil filtration system with integrated superhydrophobic and oleophilic membrane according to claim 1, characterized in that, The main body of the oil filtration device also includes a pressure control module, a flow rate regulation module, a pretreatment module, and a monitoring module; the pressure control module is configured to maintain the oil pressure between 0.1-0.5 MPa; the flow rate regulation module is configured to control the oil flow rate within the range of 1-10 L / min; the pretreatment module is located between the oil inlet and the superhydrophobic oleophilic membrane unit, and is used to preheat and coarsely filter the incoming transformer oil, wherein the preheating temperature is 40℃ to 60℃; the monitoring module is used to monitor the performance parameters of the transformer oil after filtration in real time, wherein the performance parameters include at least one of water content, breakdown voltage, and dielectric loss factor.

6. The transformer on-site oil filtration system with integrated superhydrophobic and oleophilic membrane according to claim 1, characterized in that, The main body of the oil filtration device also includes a backwashing pipeline, which is used to introduce clean oil flow to backwash the superhydrophobic and oleophilic membrane unit to remove contaminants from the membrane surface.

7. A method for on-site oil filtration of transformers using a superhydrophobic and oleophilic membrane, characterized in that, Includes the following steps: Provide a transformer field oil filtration system with an integrated superhydrophobic and oleophilic membrane as described in any one of claims 1-6; The system is connected to the transformer oil filter pipe, so that transformer oil flows in from the oil inlet and passes through the superhydrophobic oleophilic membrane unit; Water and impurities in the oil are separated by the superhydrophobic and oleophilic membrane unit, and the treated oil is discharged from the oil outlet. Monitor the insulation performance parameters during the oil filtration process and optimize the oil filtration operation based on feedback.

8. The method for on-site oil filtration of transformers using a superhydrophobic and oleophilic membrane according to claim 7, characterized in that, Before filtering the oil, a preliminary step is also included, which is to preheat the transformer oil at a temperature controlled between 40°C and 60°C to reduce the viscosity of the oil.

9. The method for on-site oil filtration of transformers using a superhydrophobic and oleophilic membrane according to claim 7, characterized in that, The superhydrophobic and oleophilic film unit is selected or combined with structural adjustments based on the form of water in the transformer oil for oil-water separation; the selection or combination of forms includes suspended, emulsified, or dissolved water.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method as described in any one of claims 7-9. The storage medium is disposed in the control unit of the oil filtration system or a mobile device communicatively connected thereto, for controlling the automated operation of the oil filtration system.

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