A degassing module and a degassing method for an on-line monitoring device of transformer oil

Abstract

The application discloses a degassing module and a degassing method for a transformer oil online monitoring device, and belongs to the technical field of transformer oil degassing, and aims to overcome the low degassing efficiency of the existing degassing device. The degassing module comprises a degassing chamber, the top of the degassing chamber is provided with an oil inlet, a flow guide structure is detachably arranged at the oil inlet, the flow guide structure comprises a disc-shaped flow guide head, the flow guide structure is provided with a plurality of flow guide outlets, the flow guide outlets are distributed around the central axis of the flow guide head, the highest position of the flow guide outlets is higher than the upper surface of the flow guide head, so that the transformer oil flows out from the flow guide outlets to the upper surface of the flow guide head. The transformer oil flows out from each flow guide outlet to the upper surface of the flow guide head and diffusely flows to all directions along the upper surface of the flow guide head, so that the transformer oil is in a scattered state when falling in the degassing chamber and has a relatively slow speed relative to the spraying, so that the falling time of the transformer oil in the degassing chamber is relatively long, and the transformer oil can be fully degassed.

Description

Technical Field

[0001] This invention belongs to the field of transformer oil degassing technology, and relates to a degassing module and degassing method used in online transformer oil monitoring devices. Background Technology

[0002] Chinese patent literature discloses an invention patent application entitled "Oil Spray Vacuum Degassing Device and Method of Use for Online Monitoring of Oil Chromatography," publication number CN108627601A. The degassing cylinder has a spray structure connected to its oil inlet. The degassing cylinder includes a cylinder body and a cylinder cover. The cylinder cover has several densely distributed through holes, forming a spray structure, or the spray structure can resemble a shower head. The spray structure needs to convert the transformer oil into a mist, requiring a relatively high spray speed and short residence time in the air, resulting in a lower degree of degassing and affecting degassing efficiency. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by proposing a degassing module and degassing method for use in transformer oil online monitoring devices, aiming to overcome the low degassing efficiency of existing degassing devices.

[0004] This invention is implemented as follows: A degassing module for use in an online transformer oil monitoring device includes a degassing chamber with an oil inlet at the top. The oil inlet is characterized by a detachable flow guide structure. The flow guide structure includes a disc-shaped flow guide head and multiple flow guide outlets distributed around the central axis of the flow guide head. The highest point of each flow guide outlet is higher than the upper surface of the flow guide head, allowing transformer oil to flow from the flow guide outlets onto the upper surface of the flow guide head.

[0005] The guide head has a first guide channel, and the guide structure includes a connecting part connected to the upper end of the guide head and connected to the oil inlet. The connecting part has a second guide channel that is connected to the oil inlet and communicates with the first guide channel. The first guide channel has a guide outlet.

[0006] The flow guide head includes a flow guide disk and a flow guide boss located on the upper end face of the flow guide disk. The outer diameter of the flow guide boss is smaller than the outer diameter of the flow guide disk, and the flow guide outlet is located on the side of the flow guide boss.

[0007] The upper surface of the guide plate slopes downward from the guide protrusion towards the periphery, and the angle between the upper and lower surfaces of the guide plate is less than or equal to 15 degrees.

[0008] The upper surface of the guide plate has a guide groove, which is connected to the guide outlet.

[0009] The degassing module also includes a quantitative chamber, a gas collection chamber, and a sample gas chamber. The gas collecting chamber has an upper chamber and a lower chamber. The gas collecting chamber is equipped with a first motor for driving the piston in the gas collecting chamber to move, a third pressure sensor for detecting the air pressure in the upper chamber, a first position sensor for detecting when the piston in the gas collecting chamber moves to the upper limit position, and a fourth position sensor for detecting when the piston in the gas collecting chamber moves to the lower limit position. The inlet and outlet of the lower chamber are connected to an exhaust pipe, and the exhaust pipe is equipped with a No. 25 valve so that when the No. 25 valve is opened, the lower chamber can communicate with the atmosphere. A valve number twenty-four is provided on the pipeline between the upper chamber and the lower chamber, so that when the valve number twenty-four is open, the upper chamber and the lower chamber are connected, and when the valve number twenty-four and the valve number twenty-five are open, the upper chamber is connected to the atmosphere. A gas diaphragm pump and a fourth valve are installed on the pipeline between the oil inlet of the upper chamber and the degassing chamber, so that when the fourth valve is opened, the gas diaphragm pump can draw the gas in the degassing chamber into the upper chamber. A second valve is provided between the oil inlet of the metering chamber and the degassing chamber, so that when the second valve is opened, the metering chamber can deliver transformer oil to the degassing chamber. A first pressure sensor is provided in the degassing chamber. The metering chamber is equipped with a second position sensor for detecting when the piston of the metering chamber moves to the upper limit position, a third position sensor for detecting when the piston of the metering chamber moves to the lower limit position, a fifth position sensor for detecting when the piston of the metering chamber moves to the metering position, a second motor for pushing the piston of the metering chamber to move, and a second pressure sensor for detecting the air pressure inside the metering chamber. A valve number 13 is installed on the pipeline between the oil outlet of the degassing chamber and the metering chamber, so that when the valve number 13 is opened, the degassing chamber and the metering chamber are connected; a first liquid level sensor for detecting the lower limit oil level in the degassing chamber and a second liquid level sensor for detecting the upper limit oil level in the degassing chamber are installed in the degassing chamber. A first valve is installed on the pipeline between the metering chamber and the first interface of the transformer so that when the first valve is opened, the transformer oil in the metering chamber can flow back into the transformer. A twelfth valve and an oil pump are installed on the pipeline between the metering chamber and the second interface of the transformer, so that when the twelfth valve is opened, the second interface of the transformer is connected to the metering chamber, and when the twelfth valve and the first valve are open, the oil pump can transport the transformer oil in the transformer from the second interface to the first interface; The oil outlet of the degassing chamber is connected to the air supply pipe, which is connected to a metering pipe. The metering pipe is connected to valve number sixteen and valve number twenty-three. Valve number fifteen is provided on the air supply pipe so that when valve number twenty-three is opened, air can be supplied to the metering pipe. When valve number sixteen is opened, the metering pipe is connected to the atmosphere. When valve number fifteen is opened, the metering pipe is connected to the degassing chamber. A tenth valve is provided on the pipeline between the sample gas chamber and the upper chamber, so that when the tenth valve is opened, the upper chamber is connected to the sample gas chamber.

[0010] A degassing method, characterized by comprising the following steps: The module is initialized by returning the transformer oil previously used for monitoring to the transformer and venting the gas that separated from the transformer oil previously used for monitoring from the module. Oil sample quantification: The transformer oil used for this monitoring was extracted into the quantification chamber; The oil sample is degassed. The transformer oil in the quantitative chamber is degassed in the degassing chamber. The degassed gas obtained by degassing the transformer oil in the degassing chamber is collected in the gas collecting chamber. The module replenishes gas when the amount of degassed gas generated from the transformer oil degassing is less than the preset amount, by replenishing the degassing chamber with pure gas that is different from the target gas being monitored. After replenishing the gas, the transformer oil in the degassing chamber is degassed again. Sample is introduced, and the degassed gas in the sample gas chamber is collected to form sample gas.

[0011] Module initialization includes the following steps: Step 1: Open valves 24 and 25. The piston in the gas collecting chamber is driven upward by the first motor. After the first position sensor detects the piston, the first motor stops working. Keep valves 24 and 25 open, open valve 4 and the gas diaphragm pump to extract the residual gas in the degassing chamber. When the first pressure sensor detects that the pressure in the degassing chamber is lower than 5 kPa, close all the above pumps and valves. Step 2: The piston in the metering chamber is driven upward by the second motor to open the second valve. The first pressure sensor detects the pressure in the degassing chamber in real time. If the pressure in the degassing chamber is greater than 10 kPa, the second motor stops running and the second valve is closed. Step 3: Open valves 4, 24, and 25 and the gas diaphragm pump to extract gas from the degassing chamber. When the pressure in the degassing chamber is less than 5 kPa, close all pumps and valves. Step 4: Repeat steps 2 and 3 until the second position sensor detects the piston in the metering chamber and the pressure in the degassing chamber is less than 5 kPa. Step 5: Open valve number 13. The piston in the metering chamber is driven downward by the second motor. After the third position sensor detects the piston in the metering chamber and the first liquid level sensor detects that there is no oil in the degassing chamber, close the second motor and valve number 13. Step 6: The piston of the metering chamber is driven upward by the second motor. The pressure of the second pressure sensor is monitored in real time. When the pressure is greater than 100 kPa, the first valve is opened. After the second position sensor detects the piston of the metering chamber, the second motor and the first valve are closed. Step 7: Open valves 4, 24, and 25 and the gas diaphragm pump to evacuate the degassing chamber. When the pressure in the degassing chamber is less than 5 kPa, close the gas diaphragm pump and all valves. Step 8: Open valve number 25. The piston in the gas collecting chamber is driven downward by the first motor. After the fourth position sensor detects the piston, the first motor stops working and valve number 25 is closed. Step 9: Open valves No. 4 and No. 24. The piston in the gas collecting chamber is driven upward by the first motor. After the first position sensor detects the piston, the first motor stops working and all valves are closed. Step 10: Open valve number 25. The piston in the gas collection chamber is driven downward by the first motor. After the fourth position sensor detects the piston, the first motor stops working and valve number 25 is closed.

[0012] Oil sample quantification includes the following steps: Step 1: Open valve 1, valve 12, and the oil pump. After circulating for 3 minutes, close the oil pump and all valves. Step 2: Open valve number 12. The piston in the metering chamber is driven downward by the second motor. When the fifth position sensor detects the piston, the second motor stops working, valve number 12 remains open, and the second pressure sensor monitors the pressure in the metering chamber in real time. After the pressure in the metering chamber is greater than 85 kPa and maintained for 20 seconds, valve number 12 is closed.

[0013] Oil sample degassing includes the following steps: Step 1: The piston in the metering chamber is driven upward by the second motor to open the second valve. The heating element heats the degassing chamber, and the transformer oil flows from the guide structure to the degassing chamber. The first pressure sensor detects the pressure in the degassing chamber. If the pressure in the degassing chamber is greater than 10 kPa, the second motor stops running and the second valve is closed. Step 2: Open valve number 4 and gas diaphragm pump to draw the sample gas that has been degassed in the degassing chamber into the gas collection chamber. When the pressure in the degassing chamber is less than 5 kPa, close all pumps and valves. Step 3: Repeat steps 1 and 2 until the second position sensor detects the piston in the metering chamber and the pressure in the degassing chamber is less than 5 kPa.

[0014] Module air replenishment includes the following steps: Step 1: Open valve number 23 for 3 seconds to fill the metering tube with high-pressure pure air, then close valve number 23 and open valve number 16 for 3 seconds to restore the gas in the metering tube to normal pressure. Step 2: Open valve number 15, and the pure gas in the metering tube enters the degassing chamber.

[0015] Dehydration after tonification includes the following steps: Step 1: Open valve number 13. The piston in the metering chamber is driven downward by the second motor. After the third position sensor detects the piston and the first liquid level sensor detects that there is no oil in the degassing chamber, close the second motor and valve number 13. Step 2: The piston in the metering chamber is driven upward by the second motor to open the second valve. The heating element heats the degassing chamber, and the transformer oil flows from the guide structure to the degassing chamber. The first pressure sensor detects the pressure in the degassing chamber. If the pressure in the degassing chamber is greater than 10 kPa, the second motor stops running and the second valve is closed. Step 3: Open valve number 4 and gas diaphragm pump to draw the degassed gas that has been removed from the degassing chamber into the gas collection chamber. When the pressure in the degassing chamber is less than 5 kPa, close the above pumps and valves. Step 4: Repeat steps 2 and 3 until the second position sensor detects the piston in the metering chamber and the pressure in the degassing chamber is less than 5 kPa.

[0016] The sample introduction process includes the following steps: When valve number ten is opened, the piston in the gas collection chamber is driven upward by the first motor. After the first position sensor detects the piston, the first motor stops working, valve number ten is closed, and the collection of sample gas is completed.

[0017] The present invention provides a degassing module and degassing method for use in an online monitoring device for transformer oil. The transformer oil flows out from each guide outlet to the upper surface of the guide head and diffuses and flows in all directions along the upper surface of the guide head. This makes the transformer oil in a dispersed state when it falls in the degassing chamber, and the speed is slower than that of spraying, so that the transformer oil falls in the degassing chamber for a longer time, which is conducive to the full degassing of the transformer oil. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of the degassing module; Figure 2 This is a schematic diagram of the flow guiding structure from the first angle. Figure 3 This is a schematic diagram of the flow guiding structure from a second angle. Figure 4 This is a cross-sectional schematic diagram of the flow guiding structure.

[0019] Figure labeling: 1. Valve No. 1; 2. Valve No. 2; 3. Gas diaphragm pump; 4. Valve No. 4; 5. Flow guiding structure; 6. First pressure sensor; 7. Second liquid level sensor; 8. Heating element; 9. First liquid level sensor; 10. Valve No. 10; 11. Sample gas chamber; 12. Valve No. 12; 13. Valve No. 13; 14. Oil pump; 15. Valve No. 15; 16. Valve No. 16; 17. Second pressure sensor; 18. Metering chamber; 19. Fifth position sensor; 20. Third position sensor; 21. 22. Second motor; 23. Metering tube; 24. Valve No. 24; 25. Valve No. 25; 26. Third pressure sensor; 27. Gas collection chamber; 28. First motor; 29. ​​Degassing chamber; 30. Second position sensor; 31. First position sensor; 32. Fourth position sensor; 510. Guide head; 511. Guide outlet; 512. First guide channel; 513. Guide plate; 514. Guide boss; 515. Guide groove; 520. Connecting part; 521. Second guide channel. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] This embodiment provides a degassing module for use in an online transformer oil monitoring device, such as... Figure 1-4 As shown, the system includes a degassing chamber 29, with an oil inlet at the top. A detachable flow guide structure 5 is installed at the oil inlet. The flow guide structure 5 includes a disc-shaped flow guide head 510 and multiple flow guide outlets 511. The flow guide outlets 511 are distributed around the central axis of the flow guide head 510, with the highest point of each outlet 511 higher than the upper surface of the flow guide head 510, allowing transformer oil to flow from the outlets 511 onto the upper surface of the flow guide head 510. The transformer oil flows from each outlet 511 onto the upper surface of the flow guide head 510 and diffuses outwards along the upper surface of the flow guide head 510. This causes the transformer oil to fall in a dispersed state within the degassing chamber 29 at a slower speed than when sprayed, resulting in a longer falling time within the degassing chamber 29, which is beneficial for thorough degassing of the transformer oil.

[0022] like Figure 4As shown, the flow guide head 510 has a first flow guide channel 512, the bottom of which is closed, meaning the transformer oil within the first flow guide channel 512 will not flow directly downwards. The flow guide structure 5 includes a connecting portion 520 connected to the upper end of the flow guide head 510 and connected to the oil inlet. The connecting portion 520 has a second flow guide channel 521 that connects to the oil inlet and communicates with the first flow guide channel 512. The first flow guide channel 512 has a flow outlet 511. The connecting portion 520 has external threads, and is detachably fixed to the oil inlet via these threads.

[0023] like Figure 2-4 As shown, the flow guide head 510 includes a flow guide disk 513 and a flow guide boss 514 located on the upper surface of the flow guide disk 513. The outer diameter of the flow guide boss 514 is smaller than the outer diameter of the flow guide disk 513, and the flow guide outlet 511 is located on the side of the flow guide boss 514. The first flow guide channel 512 has a certain length. The transformer oil flows from the vertical direction of the second flow guide channel 521 to the horizontal direction of the first flow guide channel 512, which prevents the transformer oil from flowing out of the flow guide outlet 511 immediately after reaching the lower end of the second flow guide channel 521. This helps to reduce the flow velocity of the transformer oil and allows it to diffuse more evenly in all directions.

[0024] The upper surface of the guide plate 513 slopes downward from the guide boss 514 towards the periphery, and the angle between the upper and lower surfaces of the guide plate 513 is less than or equal to 15 degrees. The inclined upper surface of the guide plate 513 ensures that the transformer oil can flow smoothly to the edge of the guide plate 513, and the small inclination angle can prevent the transformer oil from flowing too fast and reduce the falling speed of the transformer oil.

[0025] like Figure 2 , 4 As shown, the upper surface of the guide plate 513 has a guide groove 515, which is connected to the guide outlet. The guide groove 515 makes the transformer oil flow more directional after flowing out of the guide outlet, reducing the risk of transformer oil turbulence.

[0026] like Figure 1 As shown, the degassing module also includes a quantitative chamber 18, a gas collection chamber 27, and a sample gas chamber 11.

[0027] The gas collecting chamber 27 has an upper chamber and a lower chamber. The gas collecting chamber 27 is equipped with a first motor 28 for driving the piston on the gas collecting chamber 27 to move, a third pressure sensor 26 for detecting the air pressure in the upper chamber, a first position sensor 31 for detecting when the piston of the gas collecting chamber 27 moves to the upper limit position, and a fourth position sensor 32 for detecting when the piston of the gas collecting chamber 27 moves to the lower limit position.

[0028] The inlet and outlet of the lower chamber are connected to the exhaust pipe, and the exhaust pipe is equipped with valve 25 so that the lower chamber can be connected to the atmosphere when valve 25 is opened.

[0029] A valve 24 is installed on the pipeline between the upper chamber and the lower chamber so that when the valve 24 is open, the upper chamber and the lower chamber are connected, and when the valves 24 and 25 are open, the upper chamber is connected to the atmosphere.

[0030] A gas diaphragm pump 3 and a fourth valve 4 are installed on the pipeline between the oil inlet of the upper chamber and the degassing chamber 29, so that when the fourth valve 4 is opened, the gas diaphragm pump 3 can draw the gas in the degassing chamber 29 into the upper chamber.

[0031] A second valve 2 is provided between the oil inlet of the metering chamber 18 and the degassing chamber 29, so that when the second valve 2 is opened, the metering chamber 18 can deliver transformer oil to the degassing chamber 29. A first pressure sensor 6 is provided in the degassing chamber 29.

[0032] The metering chamber 18 is equipped with a second position sensor 30 for detecting when the piston of the metering chamber 18 moves to the upper limit position, a third position sensor 20 for detecting when the piston of the metering chamber 18 moves to the lower limit position, a fifth position sensor 19 for detecting when the piston of the metering chamber 18 moves to the metering position, a second motor 21 for pushing the piston of the metering chamber 18 to move, and a second pressure sensor 17 for detecting the air pressure inside the metering chamber 18.

[0033] A No. 13 valve 13 is installed on the pipeline between the oil outlet of the degassing chamber 29 and the metering chamber 18 so that the degassing chamber 29 and the metering chamber 18 are connected when the No. 13 valve 13 is opened; a first liquid level sensor 9 for detecting the lower limit oil level in the degassing chamber 29 and a second liquid level sensor 7 for detecting the upper limit oil level in the degassing chamber 29 are installed in the degassing chamber 29.

[0034] A first valve 1 is installed on the pipeline between the metering chamber 18 and the first interface of the transformer so that when the first valve 1 is opened, the transformer oil in the metering chamber 18 can flow back into the transformer.

[0035] A twelfth valve 12 and an oil pump 14 are installed on the pipeline between the metering chamber 18 and the second interface of the transformer, so that when the twelfth valve 12 is opened, the second interface of the transformer is connected to the metering chamber 18, and when the twelfth valve 12 and the first valve 1 are opened, the oil pump 14 can transport the transformer oil in the transformer from the second interface to the first interface.

[0036] The oil outlet of the degassing chamber 29 is connected to the air supply pipe, which is connected to the metering pipe 22. The metering pipe 22 is connected to valve 16 and valve 23. Valve 15 is provided on the air supply pipe so that when valve 23 is opened, air can be supplied to the metering pipe 22. When valve 16 is opened, the metering pipe 22 is connected to the atmosphere. When valve 15 is opened, the metering pipe 22 is connected to the degassing chamber 29.

[0037] A tenth valve 10 is installed on the pipeline between the sample gas chamber 11 and the upper chamber, so that when the tenth valve 10 is opened, the upper chamber is connected to the sample gas chamber 11. All valves are solenoid valves, and the degassing module uses a controller to automatically control the operation of each component.

[0038] The degassing method of the degassing module includes the following steps: The module is initialized by returning the transformer oil previously used for monitoring to the transformer and venting the gas that separated from the transformer oil previously used for monitoring from the module. The oil sample was quantitatively analyzed by extracting the transformer oil used for monitoring into the quantitative chamber 18. The oil sample is degassed. The transformer oil in the quantitative chamber 18 is degassed in the degassing chamber 29. The degassed gas obtained by degassing the transformer oil in the degassing chamber 29 is collected in the gas collecting chamber 27. The module replenishes gas. When the amount of degassed gas generated from the transformer oil degassing is insufficient, it replenishes the degassing chamber 29 with pure gas that is different from the target gas being monitored. After replenishing the gas, the transformer oil in the degassing chamber 29 is degassed again. Sample is introduced, and the degassed gas in the gas collecting chamber 27 is collected in the sample gas chamber 11 to form sample gas. Module initialization includes the following steps: Step 1: Open valves 24 and 25. The piston in the gas collecting chamber 27 is driven upward by the first motor 28. After the first position sensor 31 detects the piston, the first motor 28 stops working. Keep valves 24 and 25 open, open valve 4 and gas diaphragm pump 3 to extract residual gas from the degassing chamber 29. When the first pressure sensor 6 detects that the pressure in the degassing chamber 29 is lower than 5 kPa, close all the pumps and valves. This creates a vacuum in the degassing chamber 29 to facilitate degassing.

[0039] Step 2: The piston of the metering chamber 18 is driven upward by the second motor 21 to open the second valve 2. The pressure of the first pressure sensor 6 is monitored in real time. If the pressure of the first pressure sensor 6 is greater than 10 kPa, the second motor 21 stops running and the second valve 2 is closed. The residual transformer oil in the metering chamber 18 is degassed through the degassing chamber 29 to facilitate subsequent return of oil to the transformer.

[0040] Step 3: Open valve 4, valve 24, valve 25 and gas diaphragm pump 3 to extract gas from degassing chamber 29. When the pressure of the first pressure sensor 6 is less than 5 kPa, close all pumps and valves. In this way, degassing chamber 29 is evacuated again to facilitate further degassing of transformer oil in metering chamber 18.

[0041] Step 4: Repeat steps 2 and 3 until the second position sensor 30 detects the piston in the metering chamber 18 and the pressure of the first pressure sensor 6 is less than 5 kPa; this transfers the transformer oil in the metering chamber 18 to the degassing chamber 29.

[0042] Step 5: Open valve 13. The piston of metering chamber 18 is driven downward by the second motor 21. After the third position sensor 20 detects the piston of metering chamber 18 and the first liquid level sensor 9 detects that there is no oil in degassing chamber 29, close the second motor 21 and valve 13. Transfer the degassed transformer oil in degassing chamber 29 to metering chamber 18 so that the transformer oil can be returned to the transformer through metering chamber 18.

[0043] Step 6: The piston of the metering chamber 18 is driven upward by the second motor 21. The pressure of the second pressure sensor 17 is monitored in real time. When the pressure is greater than 100 kPa, the first valve 1 is opened. After the second position sensor 30 detects the piston of the metering chamber 18, the second motor 21 and the first valve 1 are closed. The transformer oil in the metering chamber 18 is returned to the transformer.

[0044] Step 7: Open valve 4, valve 24, valve 25 and gas diaphragm pump 3 to evacuate the degassing chamber 29. When the pressure of the first pressure sensor 6 is less than 5 kPa, close the gas diaphragm pump 3 and all valves. This will allow the residual gas in the degassing chamber 29 to be discharged as much as possible.

[0045] Step 8: Open valve 25. The piston in the gas collecting chamber 27 is driven downward by the first motor 28. After the fourth position sensor 32 detects the piston, the first motor 28 stops working and valve 25 is closed. This removes the gas from the lower chamber of the gas collecting chamber 27 and makes the upper chamber of the piston obtain a higher vacuum.

[0046] Step 9: Open valve 4 and valve 24. The piston in the gas collecting chamber 27 is driven upward by the first motor 28. After the first position sensor 31 detects the piston, the first motor 28 stops working and closes all valves. This can further improve the vacuum degree of the degassing chamber 29 and transfer the gas in the upper chamber of the gas collecting chamber 27 to the lower chamber.

[0047] Step 10: Open valve 25 (number 25). The piston in gas collecting chamber 27 is driven downward by motor 28. After position sensor 32 detects the piston, motor 28 stops working, and valve 25 (number 25) is closed. This balances the atmospheric pressure and the pressure in the lower chamber of gas collecting chamber 27. Initialization of the degassing module allows the transformer oil previously entering metering chamber 18 to return to the transformer, and discharges the gas previously extracted from the transformer oil outside the degassing module, reducing errors in subsequently collected sample gas and improving sample gas accuracy.

[0048] Oil sample quantification includes the following steps: Step 1: Open valve 1, valve 12, and oil pump 14. After circulating for 3 minutes, close oil pump 14 and all valves. This will further remove the transformer oil used for monitoring in the module last time, thus improving the accuracy of this monitoring.

[0049] Step 2: Open valve 12. The piston in metering chamber 18 is driven downward by the second motor 21. When the fifth position sensor 19 detects the piston, the second motor 21 stops working, and valve 12 remains open. The pressure of the second pressure sensor 17 is monitored in real time. After the pressure of the second pressure sensor 17 is greater than 85 kPa and maintained for 20 seconds, valve 12 is closed. The transformer oil used for monitoring is then drawn into metering chamber 18.

[0050] Oil sample degassing includes the following steps: Step 1: The piston of the metering chamber 18 is driven upward by the second motor 21, opening the second valve 2. The heating element 8 heats the degassing chamber 29, and the transformer oil flows from the guide structure 5 to the degassing chamber 29. The first pressure sensor 6 detects the pressure inside the degassing chamber 29. If the pressure inside the degassing chamber 29 is greater than 10 kPa, the second motor 21 stops running and the second valve 2 is closed. The transformer oil flows into the degassing chamber 29 under the drive of the second motor 21 and diffuses under the action of the guide structure 5, making the degassing more complete.

[0051] Step 2: Open valve 4 and gas diaphragm pump 3 to extract the sample gas that has been degassed in degassing chamber 29 into gas collecting chamber 27. When the pressure in degassing chamber 29 is less than 5 kPa, close all pumps and valves. The degassed gas formed in degassing chamber 29 is collected into gas collecting chamber 27, so that degassing chamber 29 returns to a vacuum state, so as to further degassed the transformer oil in metering chamber 18.

[0052] Step 3: Repeat steps 1 and 2 until the second position sensor 30 detects the piston in the metering chamber 18 and the pressure in the degassing chamber 29 is less than 5 kPa. This allows the transformer oil in the metering chamber 18 to flow fully into the degassing chamber 29 for degassing.

[0053] Module air replenishment includes the following steps: Step 1: Open valve 23 for 233 seconds to fill the metering tube 22 with high-pressure pure air. Then close valve 23 and open valve 16 for 163 seconds to restore the gas pressure in the metering tube 22 to normal. The target gas being monitored is usually a fault characteristic gas dissolved in transformer oil, such as hydrogen, carbon monoxide, or carbon dioxide. The supplementary pure air is a different gas from the target gas, such as oxygen or nitrogen, to avoid interference and misjudgment of the target gas monitoring. If the supplementary gas is the same as or similar to the target gas, the supplementary gas operation may introduce a gas that is the same as or similar to the target gas, causing the monitoring system to be unable to accurately distinguish between the fault gas and the supplementary gas, thus affecting the accuracy of fault judgment and early warning. Filling the metering tube 22 with high-pressure pure air helps to improve the purity of the pure air in the metering tube 22, and the pure air in the metering tube 22 still maintains a high purity after the pressure in the metering tube 22 is released.

[0054] Step 2: Open valve 15 (number 15) to allow the pure gas in metering tube 22 to enter degassing chamber 29.

[0055] Dehydration after tonification includes the following steps: Step 1: Open valve 13. The piston in metering chamber 18 is driven downward by the second motor 21. After the third position sensor 20 detects the piston and the first liquid level sensor 9 detects that there is no oil in degassing chamber 29, close the second motor 21 and valve 13.

[0056] Step 2: The piston of the metering chamber 18 is driven upward by the second motor 21 to open the second valve 2. The heating element 8 heats the degassing chamber 29. The transformer oil flows from the guide structure 5 to the degassing chamber 29. The first pressure sensor 6 detects the pressure in the degassing chamber 29. If the pressure in the degassing chamber 29 is greater than 10 kPa, the second motor 21 stops running and the second valve 2 is closed.

[0057] Step 3: Open valve 4 and gas diaphragm pump 3 to extract the degassed gas that has been removed from degassing chamber 29 into gas collecting chamber 27. When the pressure in degassing chamber 29 is less than 5 kPa, close the pump and valve.

[0058] Step 4: Repeat steps 2 and 3 until the second position sensor 30 detects the piston in the metering chamber 18 and the pressure in the degassing chamber 29 is less than 5 kPa. The gas replenishment operation introduces fresh, clean air, which may be oxygen or nitrogen. This operation increases the gas content in the transformer oil, affecting its safe operation; therefore, it must be degassed before being returned to the transformer.

[0059] The sample introduction process includes the following steps: When valve 10 is opened, the piston in gas collection chamber 27 is driven upward by the first motor 28. After the first position sensor 31 detects the piston, the first motor 28 stops working, valve 10 is closed, and the collection of sample gas is completed.

Claims

1. A degassing module for use in an online transformer oil monitoring device, comprising a degassing chamber (29), wherein the top of the degassing chamber (29) is provided with an oil inlet, characterized in that, A flow guide structure (5) is detachably provided at the oil inlet. The flow guide structure (5) includes a disc-shaped flow guide head (510). The flow guide structure (5) has multiple flow guide outlets (511). The flow guide outlets (511) are distributed around the central axis of the flow guide head (510). The highest position of the flow guide outlet (511) is higher than the upper surface of the flow guide head (510) so that transformer oil flows out from the flow guide outlet (511) to the upper surface of the flow guide head (510). The guide head (510) has a first guide channel (512), and the guide structure (5) includes a connecting part (520) connected to the upper end of the guide head (510) and connected to the oil inlet. The connecting part (520) has a second guide channel (521) that is connected to the oil inlet and communicates with the first guide channel (512). The first guide channel (512) has a guide outlet (511). The flow guide head (510) includes a flow guide disk (513) and a flow guide boss (514) located on the upper end face of the flow guide disk (513). The outer diameter of the flow guide boss (514) is smaller than the outer diameter of the flow guide disk (513). The flow guide outlet (511) is located on the side of the flow guide boss (514). The upper surface of the guide plate (513) is inclined downward from the guide boss (514) in the circumferential direction, and the angle between the upper surface and the lower surface of the guide plate (513) is less than or equal to 15 degrees. The upper surface of the guide plate (513) has a guide groove (515), which is connected to the guide outlet.

2. The degassing module for use in an online transformer oil monitoring device according to claim 1, characterized in that, The degassing module also includes a quantitative chamber (18), a gas collection chamber (27), and a sample gas chamber (11). The gas collecting chamber (27) has an upper chamber and a lower chamber. The gas collecting chamber (27) is equipped with a first motor (28) for driving the piston on the gas collecting chamber (27) to move, a third pressure sensor (26) for detecting the air pressure in the upper chamber, a first position sensor (31) for detecting the piston of the gas collecting chamber (27) to move to the upper limit position, and a fourth position sensor (32) for detecting the piston of the gas collecting chamber (27) to move to the lower limit position. The inlet and outlet of the lower chamber are connected to an exhaust pipe, and the exhaust pipe is equipped with a No. 25 valve (25) so that when the No. 25 valve (25) is opened, the lower chamber can communicate with the atmosphere. A valve (24) is provided on the pipeline between the upper chamber and the lower chamber so that when the valve (24) is open, the upper chamber and the lower chamber are connected, and when the valve (24) and the valve (25) are open, the upper chamber is connected to the atmosphere. A gas diaphragm pump (3) and a fourth valve (4) are provided on the pipeline between the oil inlet of the upper chamber and the degassing chamber (29) so that when the fourth valve (4) is opened, the gas diaphragm pump (3) can draw the gas in the degassing chamber (29) into the upper chamber; A second valve (2) is provided between the oil inlet of the metering chamber (18) and the degassing chamber (29) so that when the second valve (2) is opened, the metering chamber (18) can deliver transformer oil to the degassing chamber (29). A first pressure sensor (6) is provided in the degassing chamber (29). The metering chamber (18) is equipped with a second position sensor (30) for detecting when the piston of the metering chamber (18) moves to the upper limit position, a third position sensor (20) for detecting when the piston of the metering chamber (18) moves to the lower limit position, a fifth position sensor (19) for detecting when the piston of the metering chamber (18) moves to the metering position, a second motor (21) for pushing the piston of the metering chamber (18) to move, and a second pressure sensor (17) for detecting the air pressure inside the metering chamber (18). A valve (13) is provided on the pipeline between the oil outlet of the degassing chamber (29) and the metering chamber (18) so that when the valve (13) is opened, the degassing chamber (29) and the metering chamber (18) are connected; a first liquid level sensor (9) for detecting the lower limit oil level in the degassing chamber (29) and a second liquid level sensor (7) for detecting the upper limit oil level in the degassing chamber (29) are provided in the degassing chamber (29); A first valve (1) is provided on the pipeline between the metering chamber (18) and the first interface of the transformer so that when the first valve (1) is opened, the transformer oil in the metering chamber (18) can flow back into the transformer; A twelfth valve (12) and an oil pump (14) are provided on the pipeline between the metering chamber (18) and the second interface of the transformer, so that when the twelfth valve (12) is opened, the second interface of the transformer is connected to the metering chamber (18), and when the twelfth valve (12) and the first valve (1) are opened, the oil pump (14) can transport the transformer oil in the transformer from the second interface to the first interface; The oil outlet of the degassing chamber (29) is connected to the air supply pipe, which is connected to a metering pipe (22). The metering pipe (22) is connected to the sixteenth valve (16) and the twenty-third valve (23). The air supply pipe is equipped with a fifteenth valve (15) so that when the twenty-third valve (23) is opened, air can be supplied to the metering pipe (22). When the sixteenth valve (16) is opened, the metering pipe (22) is connected to the atmosphere. When the fifteenth valve (15) is opened, the metering pipe (22) is connected to the degassing chamber (29). A tenth valve (10) is provided on the pipeline between the sample gas chamber (11) and the upper chamber, so that when the tenth valve (10) is opened, the upper chamber is connected to the sample gas chamber (11).

3. A degassing method based on the degassing module of claim 2, characterized in that, Includes the following steps: The module is initialized by returning the transformer oil previously used for monitoring to the transformer and venting the gas that separated from the transformer oil previously used for monitoring from the module. The oil sample was quantitatively analyzed by extracting the transformer oil used for monitoring into the quantitative chamber (18). The oil sample is degassed. The transformer oil in the quantitative chamber (18) is degassed in the degassing chamber (29). The degassed gas obtained by the degassing chamber (29) is collected in the gas collecting chamber (27). When the amount of degassed gas generated from the transformer oil degassing is less than the preset amount, pure gas different from the target gas being monitored is added to the degassing chamber (29). After replenishing the gas, degas the transformer oil in the degassing chamber (29) and degas it again. Sample is introduced, and the degassed gas in the gas collecting chamber (27) is collected in the sample gas chamber (11) to form sample gas.

4. The degassing method according to claim 3, characterized in that, Module initialization includes the following steps: Step 1: Open valves 24 (24) and 25 (25). The piston in the gas collection chamber (27) is driven upward by the first motor (28). After the first position sensor (31) detects the piston, the first motor (28) stops working. Keep valves 24 (24) and 25 (25) open, open valve 4 (4) and gas diaphragm pump (3) to extract residual gas from the degassing chamber (29). When the first pressure sensor (6) detects that the pressure in the degassing chamber (29) is lower than 5 kPa, close all pumps and valves. Step 2: The piston of the metering chamber (18) is driven upward by the second motor (21) to open the second valve (2). The first pressure sensor (6) detects the pressure of the degassing chamber (29) in real time. If the pressure of the degassing chamber (29) is greater than 10 kPa, the second motor (21) stops running and closes the second valve (2). Step 3: Open valve 4 (4), valve 24 (24), valve 25 (25) and gas diaphragm pump (3) to extract gas from degassing chamber (29). When the pressure in degassing chamber (29) is less than 5 kPa, close all pumps and valves. Step 4, repeat steps 2 and 3 until the second position sensor (30) detects the piston of the metering chamber (18) and the pressure in the degassing chamber (29) is less than 5 kPa; Step 5: Open valve 13 (13). The piston of metering chamber (18) is driven to move downward by the second motor (21). After the third position sensor (20) detects the piston of metering chamber (18) and the first liquid level sensor (9) detects that there is no oil in degassing chamber (29), close the second motor (21) and valve 13 (13). Step 6: The piston of the metering chamber (18) is driven upward by the second motor (21). The pressure of the second pressure sensor (17) is detected in real time. When the pressure is greater than 100 kPa, the first valve (1) is opened. After the second position sensor (30) detects the piston of the metering chamber (18), the second motor (21) and the first valve (1) are closed. Step 7: Open valve 4 (4), valve 24 (24), valve 25 (25) and gas diaphragm pump (3) to evacuate the degassing chamber (29). When the pressure in the degassing chamber (29) is less than 5 kPa, close the gas diaphragm pump (3) and all valves. Step 8: Open valve 25 (25). The piston in the gas collection chamber (27) is driven to move downward by the first motor (28). After the fourth position sensor (32) detects the piston, the first motor (28) stops working and closes valve 25 (25). Step 9: Open valve No. 4 (4) and valve No. 24 (24). The piston in the gas collection chamber (27) is driven upward by the first motor (28). After the first position sensor (31) detects the piston, the first motor (28) stops working and closes all valves. Step 10: Open valve number 25 (25). The piston in the gas collection chamber (27) is driven to move downward by the first motor (28). After the fourth position sensor (32) detects the piston, the first motor (28) stops working and closes valve number 25 (25).

5. The degassing method according to claim 3, characterized in that, Oil sample quantification includes the following steps: Step 1: Open valve 1 (1), valve 12 (12) and oil pump (14), circulate for 3 minutes and then close oil pump (14) and all valves; Step 2: Open valve 12 (12). The piston of the metering chamber (18) is driven to move downward by the second motor (21). When the fifth position sensor (19) detects the piston, the second motor (21) stops working. Valve 12 (12) remains open. The second pressure sensor (17) detects the pressure of the metering chamber (18) in real time. After the pressure of the metering chamber (18) is greater than 85 kPa and is maintained for 20 seconds, valve 12 (12) is closed.

6. The degassing method according to claim 3, characterized in that, Oil sample degassing includes the following steps: Step 1: The piston of the metering chamber (18) is driven upward by the second motor (21) to open the second valve (2). The heating element (8) heats the degassing chamber (29). The transformer oil flows from the guide structure (5) to the degassing chamber (29). The first pressure sensor (6) detects the pressure in the degassing chamber (29). If the pressure in the degassing chamber (29) is greater than 10 kPa, the second motor (21) stops running and the second valve (2) is closed. Step 2: Open valve 4 (4) and gas diaphragm pump (3) to extract the sample gas that has been degassed in degassing chamber (29) into gas collection chamber (27). When the pressure in degassing chamber (29) is less than 5 kPa, close all pumps and valves. Step 3, repeat steps 1 and 2 until the second position sensor (30) detects the piston of the metering chamber (18) and the pressure in the degassing chamber (29) is less than 5 kPa.

7. The degassing method according to claim 3, characterized in that, Module air replenishment includes the following steps: Step 1: Open valve 23 (23) for 3 seconds to fill the metering tube (22) with high-pressure pure air, then close valve 23 (23) and open valve 16 (16) for 3 seconds to restore the gas in the metering tube (22) to normal pressure; Step 2: Open valve number 15 (15) and the pure gas in the metering tube (22) enters the degassing chamber (29).

8. The degassing method according to claim 3, characterized in that, Dehydration after tonification includes the following steps: Step 1: Open valve 13 (13). The piston of metering chamber (18) is driven to move downward by the second motor (21). After the third position sensor (20) detects the piston and the first liquid level sensor (9) detects that there is no oil in degassing chamber (29), close the second motor (21) and valve 13 (13). Step 2: The piston of the metering chamber (18) is driven upward by the second motor (21) to open the second valve (2). The heating element (8) heats the degassing chamber (29). The transformer oil flows from the guide structure (5) to the degassing chamber (29). The first pressure sensor (6) detects the pressure in the degassing chamber (29). If the pressure in the degassing chamber (29) is greater than 10 kPa, the second motor (21) stops running and the second valve (2) is closed. Step 3: Open valve 4 (4) and gas diaphragm pump (3) to extract the degassed gas that has been removed from the degassing chamber (29) into the gas collection chamber (27). When the pressure in the degassing chamber (29) is less than 5 kPa, close all pumps and valves. Step 4, repeat steps 2 and 3 until the second position sensor (30) detects the piston of the metering chamber (18) and the pressure of the degassing chamber (29) is less than 5 kPa.

9. A degassing method according to claim 3, characterized in that, The sample introduction process includes the following steps: When valve number 10 is opened, the piston in the gas collection chamber (27) is driven upward by the first motor (28). After the first position sensor (31) detects the piston, the first motor (28) stops working and valve number 10 is closed, thus completing the collection of sample gas.

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