Method and device for automatically purifying transformer oil and preparing standard oil

Abstract

The application discloses a kind of transformer oil automatic purification after preparation standard oil method and device, the pumping end of vacuum pump is respectively connected with auxiliary oil tank, oil cylinder and degassing cavity by pipeline I, pipeline VII and pipeline II;The oil outlet end of oil storage tank is connected with pipeline IX, and pipeline IX is connected with auxiliary oil tank and oil cylinder by pipeline IV and pipeline III respectively, and solenoid valve X II and pressure sensor are respectively installed on pipeline IV and pipeline III, solenoid valve I is installed on the connection between pipeline IX and oil storage, and gas micro-component assembly is installed on pipeline III.The used transformer oil can be step-by-step purified by argon replacement and nitrogen adjustment, and various typical fault transformer standard oil with arbitrary component concentration value can be prepared, which greatly reduces the cost;Waste oil can be automatically purified, and standard oil can be extracted after purification, which is convenient for extraction process, and can be recycled;The standard oil extraction process can be controlled by solenoid valve, which ensures the safety of use, ensures the whole process under sealed and constant pressure conditions, and maintains the constant component value of standard oil.

Description

Technical Field

[0001] This invention relates to the field of transformer oil chromatographic analysis technology, and more specifically, to a method and apparatus for automatically purifying transformer oil and preparing standard oil. Background Technology

[0002] During transformer operation, transformer oil contains dissolved gases, including hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide. Gas chromatography is used to separate and quantify the mixed gases in the oil. The test results are used to determine whether there are latent faults in the operating transformer. Dissolved gas analysis in transformer oil is one of the main testing items in power grid equipment condition monitoring, playing an increasingly important role in equipment operation, maintenance, and repair. The ability to accurately detect dissolved gases in transformer oil is an essential professional skill for power grid operation and maintenance and testing personnel, and is also an important part of technical personnel training.

[0003] To simulate the gas composition characteristics of transformer oil under various fault conditions, transformer standard oil is widely used as a testing object in technician training. Currently, transformer standard oil is discarded directly after use, leading to high training costs. Furthermore, large-scale storage of transformer oil poses significant safety risks to training activities. Therefore, this invention designs a method and apparatus for automatically purifying transformer oil and preparing standard oil to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for automatically purifying transformer oil and preparing standard oil.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method and apparatus for automatically purifying transformer oil and preparing standard oil, comprising a vacuum pump, an oil storage tank, an oil cylinder, a pressure sensor, an auxiliary oil tank, an electric ball valve, a liquid level sensor, a circulating pump I, an oil atomizer, and a degassing chamber;

[0006] The vacuum pump's suction end is connected to the auxiliary oil tank, oil cylinder, and degassing chamber via pipes I, VII, and II, respectively.

[0007] The oil outlet of the oil storage tank is connected to pipe IX, which is connected to the auxiliary oil tank and the oil cylinder via pipes IV and III respectively. Solenoid valve XII and pressure sensor are installed on pipes IV and III respectively. Solenoid valve I is installed at the connection between pipe IX and the oil storage tank.

[0008] The oil atomizer is fixedly installed at the top of the degassing chamber;

[0009] The oil outlet of the oil cylinder is connected to the auxiliary oil tank and the oil atomizer through pipes VI and IV, respectively.

[0010] The pipeline Ⅲ is equipped with a circulation pump Ⅰ and a solenoid valve Ⅲ between the degassing chamber and the oil cylinder;

[0011] The oil storage tank is equipped with an aeration device and a vacuum pumping device on its exterior.

[0012] The gas micro-processing component is installed on pipe III.

[0013] Preferably, the gas micro-processing component includes an oil pipe, a gas micro-processor, and an air inlet pipe;

[0014] The oil pipeline is connected to and flush with pipeline III. The gas micronizer is located inside the oil pipeline. One end of the air inlet pipe is connected to the gas micronizer, and the other end of the air inlet pipe is connected to an external gas source. The air inlet pipe is used to supply argon gas to the gas micronizer. The gas micronizer has an M-shaped cross-section, has a cavity inside, and its outer wall is made of sintered stainless steel powder. The inner wall of the oil pipeline is provided with multiple turbulence grooves.

[0015] Preferably, the bottom of the cylinder is connected to pipe II via pipe VII, one end of pipe VII is connected to pipe VIII, the other end of pipe VIII is connected to pipe VI, a solenoid valve X is installed near pipe VI, a solenoid valve VI is installed at the connection between pipe VI and pipe VIII, a solenoid valve IV is on pipe VII, a solenoid valve IX is installed at the connection between pipe VIII and pipe VII, and an air pump is also installed at the connection.

[0016] Preferably, the oil storage tank includes a tank body with an outlet and an inlet at the top and bottom of the tank body, respectively. A magnetic rod is fixedly installed in the middle of the tank body, and a filter screen is installed inside the tank body around the magnetic rod. The air outlet of the aeration device is inserted into the tank body through multiple air filling pipes, and the aeration device fills the tank body with nitrogen through the air filling pipes. The air extraction end of the vacuuming device is connected to the upper part of the tank body.

[0017] Preferably, a sampling ball valve is installed on the pipeline IX near the liquid level sensor, and a standard gas inlet is provided on the pipeline IX adjacent to the sampling ball valve. The pipeline IX is equipped with a liquid level sensor, a solenoid valve VIII, a circulating pump II, and a heating device.

[0018] Preferably, a temperature sensor is installed on the pipe III near the solenoid valve I.

[0019] Preferably, a branch pipe is installed at one end of the pipe VI near the position of the oil cylinder, and a solenoid valve V is installed on the branch pipe.

[0020] Preferably, a solenoid valve XIII is installed on the pipeline I, an oil outlet pipe is connected to the oil outlet end of the auxiliary oil tank, a solenoid valve VII is installed on the oil outlet pipe, and the pipeline I is connected to the oil outlet pipe.

[0021] Preferably, a solenoid valve II is installed on the pipe V.

[0022] Preferably, a solenoid valve X is installed on the pipe II.

[0023] A method for automatically purifying transformer oil and then preparing standard oil includes the following steps:

[0024] Step 1: Perform argon purging. Turn on the vacuum pump and open solenoid valves X, III, II, XIII, and VI to evacuate the entire system. Once the pressure sensor reaches the set vacuum level, open the electric ball valve to draw oil from the reservoir into the cylinder through the gas micro-processing component. Tiny argon bubbles come into full contact with the turbulent oil flow at a 180° angle, displacing all dissolved gases in the oil and causing them to escape.

[0025] Step 2: Vacuum degassing is performed. Once the oil cylinder is full and the level sensor is triggered, the circulation pump starts operating. Oil flows from the top of the cylinder through the solenoid valve, oil atomizer, degassing chamber, solenoid valve, and circulation pump back to the cylinder. Nitrogen gas is added to the cylinder's aeration device to replace the original argon gas in the oil, which is then removed through vacuum degassing. The amount of nitrogen added and the circulation time can be controlled, and the nitrogen saturation level can be set to prepare for subsequent standard oil preparation. The oil from this step is collected for chromatographic analysis, and the detection values ​​are used as basic data for subsequent calculations.

[0026] Step 3: Based on the oil volume in the cylinder and the expected concentrations of the standard oil and its components, calculate the amount of standard gas to be added for the standard oil preparation. The calculation formula is as follows:

[0027]

[0028] Where: n - component in oil, Cs[n] - standard gas concentration, Ct[n] - target concentration of standard oil, Cb[n] - background concentration of component n in purified oil, Ki[n] - solubility partition coefficient of component n, V o- Oil volume, V g - Volume of standard gas added.

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] This invention can deeply purify used transformer oil through stepwise argon replacement and nitrogen adjustment, and formulate it into transformer standard oil with arbitrary component concentration values ​​for various typical faults, which greatly reduces costs.

[0031] Waste oil can be automatically purified and extracted into standard oil. The extraction process is convenient and the oil can be recycled.

[0032] The background value of the purified oil can be included in the theoretical value of the standard oil calculation, which not only makes the actual standard oil volume value more in line with the expected target value, but also greatly reduces the difficulty and cost of purifying used transformer oil.

[0033] The standard oil extraction process can be automatically controlled by the solenoid valve and pump through the operating software, which is convenient to operate. While ensuring the safety of use, it ensures that the whole process is carried out under sealed and constant pressure conditions, and maintains the constant component values ​​in the standard oil. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a pipeline connection diagram of a device for automatically purifying transformer oil and preparing standard oil according to the present invention.

[0036] Figure 2 This is a structural diagram of the oil storage tank of the present invention.

[0037] Figure 3 This is a structural diagram of the gas micronization component of the present invention.

[0038] In the diagram: 1. Vacuum pump; 2. Oil tank; 201. Tank body; 202. Aeration device; 203. Vacuuming device; 204. Inlet; 205. Outlet; 206. Magnetic rod; 207. Filter screen; 208. Air charging pipe; 3. Solenoid valve I; 4. Oil cylinder; 5. Liquid level sensor; 6. Solenoid valve II; 7. Oil atomizer; 8. Degassing chamber; 9. Solenoid valve III; 10. Circulation pump I; 11. Solenoid valve IV; 12. Solenoid valve V; 13. Solenoid valve VI; 14. Solenoid valve VII; 15. Air pump; 16. Solenoid valve VIII; 17. Circulation pump II ; 18. Heating device; 19. Temperature sensor; 20. Pressure sensor; 21. Auxiliary oil tank; 22. Standard gas inlet; 23. Solenoid valve IX; 24. Sampling ball valve; 25. Solenoid valve X; 26. Solenoid valve XI; 27. Solenoid valve XII; 28. Solenoid valve XIII; 29. ​​Pipe I; 30. Pipe II; 31. Pipe III; 32. Pipe IV; 33. Pipe V; 34. Pipe VI; 35. Pipe VII; 36. Pipe VIII; 37. Pipe IX; 38. Gas micronization component; 381. Oil pipeline; 382. Turbulence channel; 383. Gas micronizer; 384. Inlet pipe. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0040] See Figure 1 As shown, the present invention provides an automatic transformer oil purification and standard oil preparation device, including a vacuum pump 1, an oil storage tank 2, an oil cylinder 4, a pressure sensor 20, an auxiliary oil tank 21, an electric ball valve 3, a liquid level sensor 5, a circulation pump I 10, an oil atomizer 7, and a degassing chamber 8.

[0041] The vacuum pump 1 is connected to the auxiliary oil tank 21, the oil cylinder 4 and the degassing chamber 8 through pipe I 29, pipe VII 35 and pipe II 30 respectively;

[0042] The oil outlet of the oil storage tank 2 is connected to a pipe IX 37. The pipe IX 37 is connected to the auxiliary oil tank 21 and the oil cylinder 4 through pipes IV 32 and III 31 respectively. Solenoid valve XII 27 and pressure sensor 20 are installed on pipes IV 32 and III 31 respectively. Solenoid valve I 3 is installed at the connection between the pipe IX 37 and the oil storage tank.

[0043] The oil atomizer 7 is fixedly installed at the top of the degassing chamber 8;

[0044] The oil outlet of the oil cylinder 4 is connected to the auxiliary oil tank 21 and the oil atomizer 7 through pipes VI 34 and IV 33 respectively.

[0045] The pipeline Ⅲ31 is equipped with a circulation pump Ⅰ10 and a solenoid valve Ⅲ9 between the degassing chamber 8 and the oil cylinder 4;

[0046] The oil storage tank 2 is equipped with an aeration device 202 and a vacuum device 203 on its exterior.

[0047] The gas micro-processing component 38 is installed on pipe III.

[0048] Turn on vacuum pump 1 and solenoid valves 11 and 12, and pull the piston of oil cylinder 4 to the lower position to prepare the oil storage space before oil intake.

[0049] The oil filtration process is as follows: Vacuum pump 1 is turned on, and vacuum pump 1 evacuates the entire system. When pressure sensor 20 reaches the set vacuum level, electric ball valve 3 is opened to draw oil from oil tank 2 into oil cylinder 4 through gas micro-processing component 38. A large amount of argon gas is refined into extremely small bubbles through gas micro-processing component 38 and quickly integrates into the oil, replacing the original hydrogen, carbon monoxide, carbon dioxide and hydrocarbon gases in the oil, forming a saturated state of argon gas in the oil.

[0050] Opening solenoid valve I3 draws oil from oil tank 2 into oil cylinder 4. When oil cylinder 4 is full and level sensor 5 is triggered, circulation pump I10 starts running. Oil flows from the top of oil cylinder 4 through solenoid valve VI13, oil atomizer 7, degassing chamber 8, solenoid valve IX23, and circulation pump I0 back to oil cylinder 4, repeating the cycle until the set time, removing dissolved argon gas and achieving the purpose of degassing and purifying high-component oil.

[0051] See Figure 3 As shown, in this embodiment, the gas micro-processing component includes an oil pipe 381, a gas micro-processor 383, and an air inlet pipe 384.

[0052] The oil pipeline 381 is connected to and flush with pipeline III. The gas micronizer 383 is located inside the oil pipeline 381. One end of the inlet pipe 384 is connected to the gas micronizer 383, and the other end is connected to an external gas source. The inlet pipe 384 is used to supply argon gas to the gas micronizer 383. The gas micronizer 383 has an M-shaped cross-section, an internal cavity, and an outer wall made of sintered stainless steel powder. Figure 3 As indicated by the arrows, the gas inlet and liquid inlet are located on the same axial line at an angle of 180 degrees. The inner wall of the oil pipe 381 is provided with multiple turbulence grooves 382, ​​which change the flow direction when oil flows through, creating a turbulent flow that better mixes with the gas. When argon gas flows out through the micronizer 383, it is compressed into tiny bubbles with a diameter of no more than 10 micrometers, which mix with the oil flow in opposite directions. According to the gas distribution law, saturated argon gas displaces other low-concentration component gases, which are then removed by vacuum pumping during the recirculation process.

[0053] See Figure 2 As shown, the oil storage tank 2 includes a tank body 201. The tank body 201 has an outlet 205 and an inlet 204 at its upper and lower ends, respectively. A magnetic rod 206 is fixedly installed in the middle of the tank body 201. A filter screen 207 is installed inside the tank body 201 around the magnetic rod 206. The air outlet of the aeration device 202 is inserted into the tank body 201 through multiple air filling pipes 208. The aeration device 202 fills the tank body 201 with nitrogen gas through the air filling pipes 208. The vacuuming device 203 is connected to the upper part of the tank body 201. The nitrogen gas is shut off after 15 minutes of circulation.

[0054] Waste transformer oil is filled into the imported 204. Impurities in the transformer oil are filtered through the filter screen 207, and iron filings in the oil can be attracted by the magnetic rod 206.

[0055] Turn on the nitrogen gas supply and fill the chamber 201 with nitrogen through the aeration device 202. Nitrogen is the carrier gas for transformer oil chromatography and has no effect on the test results. Set the aeration rate and circulation time according to the required nitrogen saturation in the oil. Excess nitrogen is extracted by the vacuum device 203 under negative pressure.

[0056] In this embodiment, the bottom of the hydraulic cylinder 4 is connected to the pipe II 30 via pipe VII 35. One end of pipe VII 35 is connected to pipe VIII 36, and the other end of pipe VIII 36 is connected to pipe VI 34. A solenoid valve X 25 is installed on pipe VIII 36 near pipe VI 34. A solenoid valve VI 13 is installed at the connection between pipe VI 34 and pipe VIII 36. A solenoid valve IV 11 is on pipe VII 35. A solenoid valve IX 23 is installed at the connection between pipe VIII 36 and pipe VII 35, and an air pump 15 is also installed at the connection.

[0057] In this embodiment, a liquid level sensor 5, a solenoid valve VIII 16, a circulating pump II 7 and a heating device 18 are installed on the pipeline IX 37. Here, the heating device 18 is a heating chamber, which is equipped with a heating tube for heating and can circulate and heat the oil.

[0058] In this embodiment, a sampling ball valve 24 is installed on the pipeline IX37 near the liquid level sensor 5. A standard gas inlet 22 is provided on the pipeline IX37 adjacent to the sampling ball valve 24. According to the concentration of the standard oil to be prepared, a certain amount of mixed standard gas is drawn with a corresponding syringe. The needle on the syringe is inserted into the standard gas inlet 22. The mixed standard gas in the syringe is drawn into the circulation pipeline under the action of slight negative pressure. After a certain period of circulation, the required standard oil sample can be prepared.

[0059] In this embodiment, a temperature sensor 19 is installed on the pipe Ⅲ31 near the solenoid valve Ⅰ3 to detect the oil temperature.

[0060] In this embodiment, a branch pipe is installed at one end of the pipe VI34 near the position of the oil cylinder 4, and a solenoid valve V12 is installed on the branch pipe.

[0061] In this embodiment, a solenoid valve XIII28 is installed on the pipeline I29, and an oil outlet pipe is connected to the oil outlet end of the auxiliary oil tank 21. A solenoid valve VII14 is installed on the oil outlet pipe, and the pipeline I29 is connected to the oil outlet pipe.

[0062] In this embodiment, a solenoid valve II6 is installed on the pipe V33.

[0063] In this embodiment, a solenoid valve X26 is installed on the pipe II30.

[0064] Standard oil preparation process:

[0065] 1. Open solenoid valves VI13 and VII14 to release the oil cylinder to normal pressure, open solenoid valve IX23, turn on air pump 15, lift the piston of oil cylinder 4 to trigger the oil level sensor 5, so that oil cylinder 4 is full of oil, and the excess oil is discharged into the auxiliary oil tank 21. Then close solenoid valves VI13, VII14, IX23 and air pump 15.

[0066] 2. Open solenoid valve VIII 16, circulation pump II 17, and heating device 18 to circulate and heat the oil to 50°C.

[0067] 3. When the oil reaches 50℃, open solenoid valve IV11 and vacuum pump 1, and move the piston of oil cylinder 4 down. When the pressure of oil cylinder 4 is set to a slight negative pressure, close solenoid valve IV11 and vacuum pump 1 to prepare for the next step of applying standard gas.

[0068] 4. Extract the above oil samples for chromatographic analysis to obtain the residual concentrations of each component, such as hydrogen, carbon monoxide, carbon dioxide, and hydrocarbons, as background values, which are included in the calculation of the standard oil preparation.

[0069] 5. Based on the required standard oil concentration, use a suitable syringe to draw a certain amount of mixed standard gas. Insert the needle of the syringe into the standard gas inlet 22. The mixed standard gas in the syringe is drawn into the circulation pipeline under slight negative pressure. After a certain period of circulation, the required standard oil sample can be prepared. The calculation formula is as follows:

[0070]

[0071] Where: n - component in oil, Cs[n] - standard gas concentration, Ct[n] - target concentration of standard oil, Cb[n] - background concentration of component n in purified oil, Ki[n] - solubility partition coefficient of component n, V o- Oil volume, V g - Volume of standard gas added.

[0072] 6. When it is time to retrieve the prepared standard oil sample, open solenoid valve IX23 and turn on air pump 15.

[0073] When the piston of cylinder 4 is raised to increase the oil pressure to the set oil sampling pressure, the oil sampling pipe is connected to the sampling ball valve 24. Opening the sampling ball valve 24 allows the standard oil sample to be taken out.

[0074] Oil removal process:

[0075] Open solenoid valve IX 23, activate solenoid valve I 3 and air pump 15. The piston of cylinder 4 rises to the top of cylinder 4, draining the remaining oil in cylinder 4 into the oil storage tank. Then close solenoid valve IX 23 and open solenoid valve X 25 and solenoid valve VI 13 to purge residual oil from cylinder 4 and its connected pipelines. Open solenoid valve VIII 16 to purge residual oil from the pipelines of circulating pump 17 and heating device 18. Close solenoid valve VI 13 and solenoid valve VIII 16, and open solenoid valve XII 27 to purge residual oil from auxiliary oil tank 21 and its pipelines. At this point, the residual oil in the oil distribution pipeline has been purged clean, preparing for the next oil filtration and distribution.

[0076] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall be within the protection scope of the present invention.

Claims

1. An automatic transformer oil purification and standard oil preparation device, characterized in that: Includes a vacuum pump, oil reservoir, oil cylinder, pressure sensor, auxiliary oil tank, electric ball valve, liquid level sensor, circulating pump I, oil atomizer, degassing chamber, and gas micro-processing component; The vacuum pump's suction end is connected to the auxiliary oil tank, oil cylinder, and degassing chamber via pipes I, VII, and II, respectively. The oil outlet of the oil storage tank is connected to pipe IX, which is connected to the auxiliary oil tank and the oil cylinder via pipes IV and III respectively. Solenoid valve XII and pressure sensor are installed on pipes IV and III respectively. Solenoid valve I is installed at the connection between pipe IX and the oil storage tank. The oil atomizer is fixedly installed at the top of the degassing chamber; The oil outlet of the oil cylinder is connected to the auxiliary oil tank and the oil atomizer via pipes VI and V, respectively. The pipeline Ⅲ is equipped with a circulation pump Ⅰ and a solenoid valve Ⅲ between the degassing chamber and the oil cylinder; The oil storage tank is equipped with an aeration device and a vacuum pumping device on its exterior. The gas micronization component is installed on pipe III; A sampling ball valve is installed near the liquid level sensor on pipe IX. A standard gas inlet is provided on pipe IX adjacent to the sampling ball valve. A liquid level sensor, solenoid valve VIII, circulating pump II and heating device are installed on pipe IX.

2. The device for automatically purifying transformer oil and preparing standard oil according to claim 1, characterized in that: The gas micro-processing component includes an oil pipe, a gas micro-processor, and an air inlet pipe; The oil pipeline is connected to and flush with pipeline III. The gas micronizer is located inside the oil pipeline. One end of the air inlet pipe is connected to the gas micronizer, and the other end of the air inlet pipe is connected to an external gas source. The air inlet pipe is used to supply argon gas to the gas micronizer. The gas micronizer has an M-shaped cross-section, has a cavity inside, and its outer wall is made of sintered stainless steel powder. The inner wall of the oil pipeline is provided with multiple turbulence grooves.

3. The device for automatically purifying transformer oil and preparing standard oil according to claim 2, characterized in that: The bottom of the hydraulic cylinder is connected to pipe II via pipe VII. One end of pipe VII is connected to pipe VIII, and the other end of pipe VIII is connected to pipe VI. A solenoid valve X is installed near pipe VI on pipe VIII. A solenoid valve VI is installed at the connection between pipe VI and pipe VIII. A solenoid valve IV is on pipe VII. A solenoid valve IX is installed at the connection between pipe VIII and pipe VII. An air pump is also installed at the connection.

4. The device for automatically purifying transformer oil and preparing standard oil according to claim 3, characterized in that: The oil storage tank includes a tank body with an outlet and an inlet at the top and bottom of the tank body, respectively. A magnetic rod is fixedly installed in the middle of the tank body. A filter screen is installed inside the tank body around the magnetic rod. The air outlet of the aeration device is inserted into the tank body through multiple air filling pipes. The aeration device fills the tank body with nitrogen through the air filling pipes. The air extraction end of the vacuuming device is connected to the upper part of the tank body.

5. The device for automatically purifying transformer oil and preparing standard oil according to claim 4, characterized in that: A temperature sensor is installed on pipe III near solenoid valve I.

6. The device for automatically purifying transformer oil and preparing standard oil according to claim 5, characterized in that: A branch pipe is installed at one end of the pipe VI near the oil cylinder, and a solenoid valve V is installed on the branch pipe.

7. The device for automatically purifying transformer oil and preparing standard oil according to claim 6, characterized in that: A solenoid valve XIII is installed on pipeline I. An oil outlet pipe is connected to the oil outlet end of the auxiliary oil tank. A solenoid valve VII is installed on the oil outlet pipe. Pipeline I is connected to the oil outlet pipe.

8. The device for automatically purifying transformer oil and preparing standard oil according to claim 7, characterized in that: Solenoid valve II is installed on pipe V, and solenoid valve X is installed on pipe II.

9. An automatic purification method for transformer oil, characterized in that, The automatic purification method uses the transformer oil automatic purification and standard oil preparation device as described in claim 8, and includes the following steps: Step 1: Perform argon gas replacement. Turn on the vacuum pump and open solenoid valves X, III, II, XIII, and VI to evacuate the entire system. Once the pressure sensor reaches the set vacuum level, open the electric ball valve to draw oil from the oil tank into the oil cylinder through the gas micro-processing component. Argon gas is injected into the oil through the gas micro-processing component to replace the gas in the oil. Step 2: Perform vacuum degassing. When the oil level in the cylinder is full and the liquid level sensor is triggered, the circulation pump runs. The oil returns to the cylinder from the top of the cylinder along the solenoid valve, oil atomizer, degassing chamber, solenoid valve, and circulation pump, and the cycle repeats until the set time. Step 3: Based on the oil capacity in the cylinder and the expected concentrations of the standard oil and its components, calculate the amount of standard gas to be added for the standard oil preparation. The calculation formula is as follows: Where: n - component in oil, Cs[n] - standard gas concentration, Ct[n] - target concentration of standard oil, Cb[n] - background concentration of component n in purified oil, Ki[n] - solubility partition coefficient of component n, V o - Oil volume, V g - Volume of standard gas added.

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