A transformer oil free fiber filtering and cleaning integrated extraction device and method

Abstract

The present application relates to transformer oil detection technical field, disclose a kind of free fibre filtration cleaning integrated extraction device and method in transformer oil, including cleaning liquid tank, transformer oil tank, filter, oil pump, spray head, waste liquid collection tank and power controller;Oil pump two pressurized oil sample in transformer oil tank into filter, and free fibre is intercepted by microporous filter with support net support in it;Oil pump one cooperates spray head and is washed to transformer oil tank inner wall, and residual fibre is stripped and is guided to filter in;Filter oil outlet is connected with two switching valves Branch pipeline;Power controller automatically controls pump and valve alternately opening and closing, and the discharged transformer waste oil and waste cleaning liquid are respectively introduced into waste oil tank and waste liquid tank and isolated collection.The present application avoids the problem of fibre residue in the inner wall of the container and filter membrane damage caused by fluid pressurization, realizes the automatic classification of waste oil and cleaning waste liquid, and improves the accuracy of free fibre extraction.

Description

Technical Field

[0001] This invention relates to the field of transformer oil testing technology, specifically to an integrated extraction device and method for filtering, cleaning, and extracting free fibers in transformer oil. Background Technology

[0002] The free fiber content in transformer insulating oil is an important indicator for assessing the internal insulation condition of a transformer. Current extraction methods for free fibers from transformer oil are typically performed in open or semi-open environments, which can easily lead to airborne impurities entering the pipeline and causing cross-contamination of the oil sample. Due to the adhesive properties of transformer oil, some tiny free fibers remain on the inner wall of the container after the sample is drained. Conventional methods struggle to thoroughly rinse and remove these fibers from the inner wall, resulting in missed samples and reducing the accuracy of free fiber test results.

[0003] In the fluid pressurization filtration process, using only thin microporous membranes is prone to deformation or rupture under fluid impact. Furthermore, the lack of a reliable sealing structure at the membrane edges easily leads to edge leakage, causing fibers to slip through the mesh. In addition, existing extraction devices rely on manual valve control for flow path switching when handling waste fluid. This method is prone to operational delays, resulting in waste cleaning fluid from membrane rinsing directly mixing with transformer waste oil, causing cross-mixing and destroying the recycling value of transformer waste oil. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated extraction device and method for filtering and cleaning free fibers in transformer oil. This solves the problems of existing extraction devices being susceptible to external contamination, having fibers that easily remain on the inner wall of the container leading to incomplete extraction, and being prone to cross-mixing of waste liquid and side leakage due to filter membrane rupture during manual operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An integrated extraction device for filtering and cleaning free fibers in transformer oil includes a cleaning liquid tank, a transformer oil tank, a filter, an oil pump one, an oil pump two, and a spray head. The outlet of the cleaning liquid tank is connected to the inlet of the oil pump one via a pipeline. The outlet of the oil pump one is connected to the spray head installed at the top of the transformer oil tank via a pipeline passing through the top outer wall of the transformer oil tank. The bottom outlet of the transformer oil tank is connected to the inlet of the oil pump two via a pipeline. The outlet of the oil pump two is connected to the filter inlet on the outer surface of the filter via a pipeline. The filter has a filter chamber inside. The edge of the filter membrane support mesh is fixed to the inner side wall of the filter chamber and divides the filter chamber into an isolated inlet chamber and an outlet chamber. The filter inlet is connected to the inlet chamber, and the filter outlet on the outer surface of the filter is connected to the outlet chamber.

[0006] Preferably, the system further includes a waste oil tank, a waste liquid tank, a switching valve one, and a switching valve two; the filter outlet is connected to a three-way branch pipe, the other two ends of which are respectively connected to the inlet end of the switching valve one and the inlet end of the switching valve two; the outlet end of the switching valve one is connected to the waste oil tank; and the outlet end of the switching valve two is connected to the waste liquid tank.

[0007] Preferably, a microporous filter membrane is also laid in the liquid inlet chamber. The microporous filter membrane is attached to and covers the surface of the filter membrane support mesh. The sealing gasket is attached to and pressed tightly on the outer edge of the microporous filter membrane. The locking device is installed on the outside of the filter. The locking device presses and fixes the sealing gasket, the microporous filter membrane and the filter membrane support mesh in the filter chamber.

[0008] Preferably, it also includes a power controller, which is electrically connected to the first oil pump, the second oil pump, the first switching valve, and the second switching valve.

[0009] Preferably, the spray head is a ring-shaped array of spray heads, and the spray direction of the spray head is towards the inner wall surface of the transformer oil tank.

[0010] Preferably, the pore size of the microporous filter membrane is from 0.5 μm to 2.0 μm, and the microporous filter membrane is made of hydrophobic polytetrafluoroethylene material or hydrophilic polytetrafluoroethylene material.

[0011] Preferably, both the first switching valve and the second switching valve are electromagnetic control valves.

[0012] Preferably, the power controller is a programmable logic controller, and the power controller has a pre-stored control program.

[0013] Preferably, both the top outer wall of the waste oil tank and the top outer wall of the waste liquid tank are provided with vents.

[0014] A method for integrated filtration, cleaning, and extraction of free fibers from transformer oil includes the following steps: The transformer oil sample to be tested is injected into the transformer oil tank, and the cleaning fluid is injected into the cleaning fluid tank. The power controller starts the second oil pump and opens the first switching valve. The transformer oil sample to be tested is pressurized by the second oil pump and delivered to the inlet chamber for filtration. The free fibers in the transformer oil sample to be tested are trapped on the surface of the microporous filter membrane. The filtered waste oil passes through the microporous filter membrane, the filter membrane support mesh, the outlet chamber, the filter outlet and the first switching valve and flows into the waste oil tank. The power controller shuts off the second oil pump and the first switching valve, while simultaneously starting the first oil pump and opening the second switching valve. The cleaning fluid in the cleaning fluid tank is pressurized by the first oil pump and delivered to the spray head, where it is sprayed onto the inner wall of the transformer oil tank. After cleaning the transformer oil tank, the cleaning fluid flows into the inlet chamber to rinse the free fibers trapped on the microporous filter membrane. The rinsing waste liquid flows through the outlet chamber, the filter outlet, and the second switching valve into the waste liquid tank. The power controller shuts down oil pump one and restarts oil pump two to discharge the residual liquid in the transformer oil tank into the waste liquid tank, ending the cleaning process and opening the filter to remove the free fibers.

[0015] This invention provides an integrated extraction device and method for filtering, cleaning, and removing free fibers from transformer oil. It offers the following advantages: 1. This invention isolates the oil sample from external environmental cross-contamination by setting up a sealed transformer oil tank and cleaning fluid tank; at the same time, it uses an oil pump and a spray head to jet-wash the inner wall of the transformer oil tank, peeling off the free fibers adhering to the tank wall and introducing them into the filter, avoiding the problem of sample extraction omission caused by tiny fibers left on the inner wall, and improving the accuracy of free fiber extraction results.

[0016] 2. This invention connects branch pipelines with switching valve one and switching valve two to the drain end of the filter, which are respectively connected to the waste oil tank and the waste liquid tank. Under the timing control of the power controller, the two switching valves open and close alternately according to the filtration and cleaning processes, guiding the discharged waste transformer oil and waste cleaning fluid to independent storage tanks. This avoids waste cleaning solvent from mixing with waste oil, maintains the recycling value of waste transformer oil, and realizes automated classification and collection of waste liquid.

[0017] 3. In this invention, a filter membrane support mesh is laid on the back side of the microporous filter membrane of the filter. The surface structure of the mesh provides support for the filter membrane and prevents the microporous filter membrane from denting or breaking when the fluid is pressurized and penetrates. In conjunction with the external locking device, the sealing gasket is pressed against the edge of the filter membrane, sealing the gap between the components and preventing the fluid from leaking at the edge. This ensures the structural stability and integrity of the tiny free fibers during the interception and extraction process. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the extraction device of the present invention; Figure 2 This is a schematic diagram of the filter structure of the present invention; Figure 3 This is a schematic diagram of the structure of the spray head in the transformer oil tank of the present invention.

[0019] The components include: 1. Cleaning fluid tank; 2. Transformer oil tank; 3. Waste oil tank; 4. Waste liquid tank; 5. Filter; 6. Oil pump one; 7. Oil pump two; 8. Switching valve one; 9. Switching valve two; 10. Power controller; 11. Filter inlet; 12. Filter membrane support mesh; 13. Filter outlet; 14. Locking device; 15. Sealing gasket; and 16. Spray head. Detailed Implementation

[0020] The technical solutions in 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.

[0021] Please see the appendix Figure 1 Appendix Figure 2 and attached Figure 3 An integrated extraction device for filtering and cleaning free fibers in transformer oil includes a cleaning liquid tank 1, a transformer oil tank 2, a filter 5, an oil pump 6, an oil pump 7, and a spray head 16. The outlet end of the cleaning liquid tank 1 is connected to the inlet end of the oil pump 6 via a pipeline. The outlet end of the oil pump 6 is connected to the spray head 16 installed at the top of the transformer oil tank 2 via a pipeline passing through the top outer wall of the transformer oil tank 2. The bottom outlet end of the transformer oil tank 2 is connected to the inlet end of the oil pump 7 via a pipeline. The outlet end of the oil pump 7 is connected to the filter inlet 11 on the outer surface of the filter 5 via a pipeline. The filter 5 has a filter chamber inside. The edge of the filter membrane support mesh 12 is fixed to the inner side wall of the filter chamber and divides the filter chamber into an isolated inlet chamber and an outlet chamber. The filter inlet 11 is connected to the inlet chamber, and the filter outlet 13 on the outer surface of the filter 5 is connected to the outlet chamber.

[0022] This device uses transformer oil tank 2 to seal the oil sample to be tested, isolating it from the external environment and preventing cross-contamination during extraction, thereby improving the accuracy of fiber extraction results. Meanwhile, cleaning solution tank 1 is used to centrally store cleaning solvent, reducing the need for frequent manual operation to add solvent, preventing air impurities from entering the pipeline, and ensuring the cleanliness of the internal flow control system.

[0023] During the fluid transport and cleaning stage, oil pump 7 pressurizes and pumps the transformer oil sample to the subsequent filtration pipeline; oil pump 6, in conjunction with spray head 16, sprays a wide-angle spray onto the inner wall of transformer oil tank 2, using fluid pressure to wash away and remove free fibers adhering to the inner wall. The mixture containing free fibers then enters filter 5, which consists of a pressure-resistant outer shell assembly, a sealing ring, a microporous filter membrane, and an internal support assembly. It can intercept and enrich tiny free fibers in a sealed state. In the filtration process, the filter inlet 11 and filter outlet 13 work together to form a directional flow guide, directing the fluid to penetrate the internal filter membrane in one direction, avoiding dead zones or short circuits within the cavity. To cope with the pressure impact of the fluid, the filter membrane support mesh 12 provides back-grid support for the surface-laid filter membrane, preventing deformation or rupture of the filter membrane during high-pressure penetration, ensuring structural stability and extraction integrity during the free fiber interception process.

[0024] Please see the appendix Figure 1 and attached Figure 2 It also includes waste oil tank 3, waste liquid tank 4, switching valve 1 8 and switching valve 2 9; the filter outlet 13 is connected to a three-way branch pipe, and the other two ends of the three-way branch pipe are respectively connected to the inlet end of switching valve 1 8 and the inlet end of switching valve 2 9; the outlet end of switching valve 1 8 is connected to waste oil tank 3; the outlet end of switching valve 2 9 is connected to waste liquid tank 4.

[0025] The filter outlet 13 at the rear of the device is connected to a three-way branch pipe, dividing the drainage channel into two paths, which are respectively connected to the inlet ends of switching valve 8 and switching valve 9. During operation, switching valve 8 and switching valve 9 alternately open to switch the flow path according to the current process. In the transformer oil filtration stage, switching valve 8 is open, and the waste transformer oil is discharged into the waste oil tank 3 for centralized collection, avoiding waste oil leakage and environmental pollution, and facilitating subsequent unified recycling and treatment; in the filter membrane cleaning stage, switching valve 9 is open, and the waste cleaning fluid generated from cleaning free fibers is discharged into the waste liquid tank 4. Through the alternating opening and closing of the valves and the cooperation of the two storage tanks, the waste liquids generated in different processes are guided and isolated separately, preventing waste cleaning solvents from mixing into the waste transformer oil, maintaining the recycling value of waste oil, and meeting the waste classification and collection requirements during equipment operation.

[0026] Please see the appendix Figure 2A microporous filter membrane is also laid in the liquid inlet chamber. The microporous filter membrane is attached to and covers the surface of the filter membrane support net 12. The sealing gasket 15 is attached to and pressed tightly on the outer edge of the microporous filter membrane. The locking device 14 is installed on the outside of the filter 5. The locking device 14 presses and fixes the sealing gasket 15, the microporous filter membrane and the filter membrane support net 12 in the filter chamber.

[0027] The microporous membrane inside the filtration chamber is used to intercept and extract free fibers from the transformer oil. Because the membrane itself is thin, a filter membrane support mesh 12 is attached to the back of the microporous membrane, using its surface structure to support the membrane and prevent it from denting or rupturing when pressure is applied by the fluid, thus reducing the risk of impurities leaking through. The sealing gasket 15 is directly pressed against the outer edge of the microporous membrane to seal gaps created during component assembly, preventing high-pressure fluid from leaking around the filter membrane. Externally, the locking device 14 is threaded into the housing of the filter 5, providing axial clamping force to sequentially press and fix the sealing gasket 15, the microporous membrane, and the filter membrane support mesh 12 within the filtration chamber, ensuring the internal components remain fixed and sealed when subjected to fluid impact.

[0028] Please see the appendix Figure 1 It also includes a power controller 10, which is electrically connected to oil pump 6, oil pump 7, switching valve 8 and switching valve 9 respectively.

[0029] The power controller 10 integrates a programmable logic controller (PLC) motherboard and relay module, serving as the centralized control terminal for the extraction device. It also integrates a PLC control circuit to receive process parameters and output control signals to various electrical actuators according to a preset sequence. In the filtration process, the power controller 10 outputs a running signal to oil pump 7, controlling its constant operation to ensure the transformer oil sample is pumped into the filtration pipeline at a stable flow rate. In the cleaning process, the power controller 10 outputs a signal to oil pump 6, controlling it to pump fluid according to a set time cycle to adjust the spray flow rate and rinsing duration of the cleaning solution. Simultaneously, switching valves 8 and 9 synchronously switch the opening and closing of their corresponding pipelines according to the instructions issued by the power controller 10. The various electromechanical components are linked by receiving signals from the power controller 10, replacing manual start / stop of the pumps and valve turning, avoiding the problems of delayed action or untimely pipeline disconnection caused by manual operation, preventing waste cleaning solution from being mistakenly mixed into the transformer waste oil pipeline, and ensuring the accuracy of the separation and recovery of the two waste liquids.

[0030] Please see the appendix Figure 1 and attached Figure 3 The spray head 16 is a ring-shaped array of spray heads, and the spray direction of the spray head 16 is towards the inner wall surface of the transformer oil tank 2.

[0031] The spray head 16 is a ring-shaped nozzle structure used to disperse and evenly spray the input single stream of cleaning fluid across the entire tank wall. During the cleaning stage, the oil pump 6 pressurizes the cleaning fluid in the pipeline, and the fluid is sprayed outward through the spray head 16. Because the spray angle of the nozzle is directed towards the inner wall of the transformer oil tank 2, multiple jets wash and peel off the adhering substances on the tank wall through physical impact. This structural design avoids the problem of missed sample extraction caused by tiny free fibers remaining on the inner wall after the transformer oil is drained, reduces the unnecessary loss of the tested fibers, and ensures the accuracy of the extraction results.

[0032] Please see the appendix Figure 2 The microporous filter membrane has a pore size of 0.5μm to 2.0μm and is made of hydrophobic or hydrophilic polytetrafluoroethylene material.

[0033] The microporous filter membrane is made of hydrophobic or hydrophilic polytetrafluoroethylene (PTFE), a material with chemical corrosion resistance. When alternately exposed to transformer oil and organic cleaning solvents, it prevents chemical dissolution or physical swelling deformation, maintaining the stability of the separation structure. While ensuring material stability, the pore size of the microporous filter membrane is set between 0.5 μm and 2.0 μm to physically intercept tiny free fibers in the transformer oil. This pore size range avoids both excessively large pores that allow fine fibers to pass through and excessively small pores that increase fluid penetration resistance and cause pipe blockage. This combination of corrosion-resistant material and specific pore size reduces sample loss errors during extraction, ensuring the continuity of the free fiber filtration and extraction process and the accuracy of the test results.

[0034] Please see the appendix Figure 1 Both switching valve 1 (8) and switching valve 2 (9) are electromagnetic control valves.

[0035] The switching valves 8 and 9 installed at the drain end of the device are both electromagnetically controlled valves, each containing an electromagnet assembly, a return spring, a valve body, and a valve core. During operation, the electromagnet coil is energized or de-energized according to the received control signal, driving the internal valve core to move, thereby opening and closing the fluid pipeline. In the waste liquid treatment process, switching valves 8 and 9 alternately open and close to switch the flow path, guiding the waste transformer oil and waste cleaning fluid discharged from different processes to independent recovery pipelines. This electromagnetic valve control structure replaces the traditional manual mechanical valves, avoiding pipeline cutoff errors caused by delays or mistakes in manual operation, preventing cross-mixing of waste transformer oil and waste cleaning fluid, and meeting the process requirements for automated waste liquid classification and recovery during equipment operation.

[0036] Please see the appendix Figure 1 The power controller 10 is a programmable logic controller, and the power controller 10 has a pre-stored control program.

[0037] As the electrical control terminal of the extraction device, the power controller 10 adopts a PLC control motherboard, which consists of a central processing unit, a storage module, input / output interfaces, and a power module. It is used for centralized scheduling and on / off control of the oil pumps and switching valves in the pipeline. Based on this hardware, the power controller 10 has a pre-stored process control program. In the transformer oil filtration and internal pipeline cleaning processes, this program instruction is responsible for defining the opening sequence and operating cycle of each electrical actuator. This programmed timing control method replaces manual start-up and shutdown of the equipment, avoiding valve switching delays or pump idling caused by manual timing deviations, reducing human error in the extraction process, and ensuring the automated and stable operation of the free fiber extraction process.

[0038] Please see the appendix Figure 1 Vents are provided on the top outer wall of waste oil tank 3 and the top outer wall of waste liquid tank 4.

[0039] Both waste oil tank 3 and waste liquid tank 4 have vents on their top outer walls. During the liquid recovery process, the continuous flow of transformer waste oil or waste cleaning fluid into the tanks causes the liquid level to rise, and the compressed air inside the tanks is discharged through the vents. The vents are used to balance the air pressure inside and outside the tanks, preventing pipeline pressure buildup, liquid backflow, or waste liquid overflow caused by increased air pressure inside the tanks. The pressure relief and venting function of the vents reduces the risk of waste liquid overflow during the collection process, ensuring the safety and smooth operation of the fluid recovery process.

[0040] Working principle: During operation, the transformer oil sample to be tested and the organic cleaning solvent are first injected into the transformer oil tank 2 and the cleaning fluid tank 1 respectively in a sealed manner. Then, the power controller 10 outputs control commands according to the preset process sequence, first starting the oil pump 7 and opening the switching valve 8, which pressurizes the oil sample in the transformer oil tank 2 and pumps it into the inlet chamber of the filter 5. Under pressure, the oil sample penetrates the microporous filter membrane supported by the filter membrane support mesh 12. The free fibers in the oil are trapped on the surface of the filter membrane, and the transformer waste oil that has penetrated the filter membrane is discharged from the filter outlet 13 through the switching valve 8 into the waste oil tank 3 for collection.

[0041] After the transformer oil sample is drained, the power controller 10 disconnects oil pump 7 and switching valve 8, then starts oil pump 6 and opens switching valve 9. The solvent in cleaning tank 1 is pressurized by oil pump 6 and delivered to the spray head 16 at the top of transformer oil tank 2. Multiple jets forcefully flush and peel off the free fibers adhering to the tank wall. The cleaning solvent carrying the residual fibers enters the filter 5 through the pipeline to perform a secondary rinsing of the filter membrane surface. The resulting waste cleaning liquid passes through the filter outlet 13 and is discharged into the waste liquid tank 4 through switching valve 9 for independent storage to avoid mixing with the transformer waste oil. During the continuous drainage phase, the vents at the top of waste oil tank 3 and waste liquid tank 4 expel the air squeezed by the rising liquid level to maintain the air pressure balance of the pipeline system and prevent fluid pressure buildup. After the cleaning process is completed, the equipment is shut down. The operator loosens the external locking device 14 to release the pressure of the sealing gasket 15, opens the filter 5, and removes the microporous filter membrane with attached free fibers, completing the sample extraction.

Claims

1. An integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil, characterized in that, The system includes a cleaning fluid tank (1), a transformer oil tank (2), a filter (5), an oil pump one (6), an oil pump two (7), and a spray head (16). The outlet end of the cleaning fluid tank (1) is connected to the inlet end of the oil pump one (6) via a pipeline. The outlet end of the oil pump one (6) is connected to the spray head (16) installed at the top of the transformer oil tank (2) via a pipeline passing through the top outer wall of the transformer oil tank (2). The bottom outlet end of the transformer oil tank (2) is connected to the oil pump one (6) via a pipeline. The inlet end of the second (7) is connected, and the outlet end of the second (7) is connected to the filter inlet (11) on the outer surface of the filter (5) through a pipeline; the filter (5) has a filter chamber inside, and the edge of the filter membrane support mesh (12) is fixed on the inner side wall of the filter chamber and divides the filter chamber into an inlet chamber and an outlet chamber that are isolated from each other. The filter inlet (11) is connected to the inlet chamber, and the filter outlet (13) on the outer surface of the filter (5) is connected to the outlet chamber.

2. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 1, characterized in that, It also includes a waste oil tank (3), a waste liquid tank (4), a switching valve one (8), and a switching valve two (9); the filter outlet (13) is connected to a three-way branch pipe, and the other two ends of the three-way branch pipe are respectively connected to the inlet end of the switching valve one (8) and the inlet end of the switching valve two (9); the outlet end of the switching valve one (8) is connected to the waste oil tank (3); the outlet end of the switching valve two (9) is connected to the waste liquid tank (4).

3. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 2, characterized in that, The inlet chamber is also lined with a microporous filter membrane, which is attached to and covers the surface of the filter membrane support net (12). The sealing gasket (15) is attached to and pressed against the outer edge of the microporous filter membrane. The locking device (14) is installed on the outside of the filter (5). The locking device (14) presses and fixes the sealing gasket (15), the microporous filter membrane and the filter membrane support net (12) in the filter chamber.

4. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 3, characterized in that, It also includes a power controller (10), which is electrically connected to the first oil pump (6), the second oil pump (7), the first switching valve (8), and the second switching valve (9), respectively.

5. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 1, characterized in that, The spray head (16) is a ring-shaped array of spray heads, and the spray direction of the spray head (16) is towards the inner wall surface of the transformer oil tank (2).

6. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 3, characterized in that, The microporous filter membrane has a pore size of 0.5 μm to 2.0 μm and is made of hydrophobic polytetrafluoroethylene (PTFE) or hydrophilic PTFE.

7. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 2, characterized in that, Both the first switching valve (8) and the second switching valve (9) are electromagnetic control valves.

8. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 4, characterized in that, The power controller (10) is a programmable logic controller, and the power controller (10) has a pre-stored control program.

9. The integrated extraction device for filtering, cleaning, and removing free fibers from transformer oil according to claim 2, characterized in that, Vents are provided on the top outer wall of the waste oil tank (3) and the top outer wall of the waste liquid tank (4).

10. A method for integrated filtration, cleaning, and extraction of free fibers from transformer oil, characterized in that... The device for integrating filtration, cleaning, and extraction of free fibers in transformer oil according to any one of claims 1-9 comprises the following steps: The transformer oil sample to be tested is injected into the transformer oil tank (2), and the cleaning fluid is injected into the cleaning fluid tank (1). The power controller (10) starts the second oil pump (7) and opens the first switching valve (8). The transformer oil sample to be tested is pressurized by the second oil pump (7) and transported to the inlet chamber for filtration. The free fibers in the transformer oil sample to be tested are trapped on the surface of the microporous filter membrane. The filtered waste oil passes through the microporous filter membrane, the filter membrane support mesh (12), the outlet chamber, the filter outlet (13) and the first switching valve (8) and flows into the waste oil tank (3). The power controller (10) shuts off the second oil pump (7) and the first switching valve (8), and at the same time starts the first oil pump (6) and opens the second switching valve (9). The cleaning fluid in the cleaning fluid tank (1) is pressurized by the first oil pump (6) and delivered to the spray head (16) and sprayed onto the inner wall of the transformer oil tank (2). After cleaning the transformer oil tank (2), the cleaning fluid flows into the inlet chamber to rinse the free fibers trapped on the microporous filter membrane. The waste liquid after rinsing flows through the outlet chamber, the filter outlet (13) and the second switching valve (9) into the waste liquid tank (4). The power controller (10) shuts off the first oil pump (6) and restarts the second oil pump (7) to discharge the residual liquid in the transformer oil tank (2) into the waste liquid tank (4), ending the cleaning process and opening the filter (5) to remove the free fibers.

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