CN113567625B - Automatic measuring device for free gas of oil immersed transformer - Google Patents
Automatic measuring device for free gas of oil immersed transformer Download PDFInfo
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- CN113567625B CN113567625B CN202110830699.4A CN202110830699A CN113567625B CN 113567625 B CN113567625 B CN 113567625B CN 202110830699 A CN202110830699 A CN 202110830699A CN 113567625 B CN113567625 B CN 113567625B
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- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000009423 ventilation Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 238000007599 discharging Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- Housings And Mounting Of Transformers (AREA)
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Abstract
The invention discloses an automatic free gas measuring device of an oil immersed transformer, which comprises a box body arranged on the transformer, wherein a gas collecting box connected with a gas relay interface for collecting gas is arranged in the box body, a measuring box for extracting gas in the gas collecting box for detection is arranged outside the gas collecting box in the box body, the measuring box is respectively connected with the upper part and the lower part of the gas collecting box to form a communication loop, and a blocking piece for ventilating and blocking oil from entering an inner cavity of the measuring box is arranged at the communication interface between the measuring box and the gas collecting box; the gas collecting box is respectively connected with an oil discharge pipeline and an exhaust pipeline; the gas relay control device also comprises a control module which receives the gas relay signal and controls ventilation and oil discharge. The invention realizes the automatic separation and detection of the free gas of the gas relay, utilizes the loop formed between the gas collecting box and the measuring box, empties the free gas in the pipeline by the principle of the communicating vessel, so that the detection precision is higher, provides gas component data for the transformer protection device in time, and is beneficial to accurately judging the fault type.
Description
Technical Field
The invention relates to a gas measuring device, in particular to an automatic measuring device for free gas of an oil immersed transformer.
Background
The oil immersed transformer uses oil as a main insulating means of the transformer and relies on the oil as a cooling medium. The gas relay is a protection device of an oil immersed transformer and is arranged in a pipeline between an oil storage cabinet and an oil tank of the transformer. When the oil immersed transformer fails, the insulating oil and gas in the transformer can be subjected to physical and chemical changes simultaneously to generate free gas, the free gas enables the contact of the gas relay to act, a designated control loop is connected, and a signal alarm is sent out timely. The detection of the generated free gas can help to analyze the working state of the transformer and locate the fault cause. At present, the free gas detection mainly adopts a manual detection mode, the speed is low, an analysis result cannot assist a transformer protection device in analyzing the running state of a transformer, and potential safety hazards exist in manual gas collection when the transformer is in a fault state.
Patent CN202010436334 provides a gas collecting box and a transformer, the gas collecting box is arranged on the transformer and connected with the gas outlet of the gas relay, the oil inlet pipe of the gas collecting box is arranged at one side of the gas collecting box; the sensor and the oil inlet pipe are arranged on the same side of the gas collecting box, the gas components in the gas collecting box are detected through the sensor, and information of the gas components is sent to operation and maintenance personnel; the oil discharging assembly is arranged on the other side of the gas collecting box and opposite to the oil inlet pipe, the exhaust assembly is arranged on one side of the gas collecting box, which is connected with the oil inlet pipe and the side face where the oil discharging assembly is arranged, the oil discharging assembly and the exhaust assembly are respectively provided with an oil discharging valve and an exhaust valve, and oil and gas in the gas collecting box are respectively discharged through the oil discharging valve and the exhaust valve. The invention can detect the gas component in real time, can rapidly acquire the internal condition of the transformer, and realizes the safe pre-judgment and rapid maintenance and fault elimination of the transformer operation.
However, the gas sensor in this patent is installed in the outer wall of the gas collection box, and when the transformer is working normally, the inside of the gas collection box is filled with transformer oil, and the sensing head of the gas sensor is immersed in the oil for a long time. When the gas sensor measures, the surface of the sensor head is covered by an oil film, so that the measurement accuracy can be influenced, and the model selection of the gas sensor is limited.
Disclosure of Invention
The invention aims to: the invention aims to provide an automatic measuring device for free gas of an oil immersed transformer, which can prevent a sensing head of a gas sensor from being immersed in transformer oil for a long time to detect more accurately.
The technical scheme is as follows: the invention discloses an automatic free gas measuring device of an oil immersed transformer, which comprises a box body arranged on the transformer, wherein a gas collecting box connected with a gas relay interface for collecting gas is arranged in the box body, a measuring box for extracting gas in the gas collecting box for detection is arranged outside the gas collecting box in the box body, the measuring box is respectively connected with the upper part and the lower part of the gas collecting box to form a communication loop, and a blocking piece for ventilating and blocking oil from entering an inner cavity of the measuring box is arranged at a communication interface between the measuring box and the gas collecting box; the gas collecting box is respectively connected with a gas exhaust pipeline and a gas exhaust pipeline; the system also comprises a control module, and the functions of the control module comprise: ventilation and oil discharge control, gas sensor signal acquisition and data processing, gas relay signal receiving, transformer protection device communication and the like.
Preferably, a pipeline connected with the upper part of the measuring box and the gas collecting box is communicated with an exhaust pipeline of the gas collecting box.
Preferably, the pipeline connected with the upper part of the measuring box and the gas collecting box is communicated with the exhaust pipeline of the gas collecting box, and an inclined section with an inclination angle larger than 90 degrees is arranged at the position. The branch pipe is inclined to raise the communication position of the horizontal branch pipe and the vertical branch pipe, and free gas in the horizontal branch pipe can be completely emptied by utilizing the liquid level difference.
Preferably, a moving element for changing the air pressure in the measuring box so as to extract the air from the air collecting box and discharge the air outwards is arranged in the measuring box.
Preferably, the moving element is a piston arranged in the measuring box, and an electric telescopic rod is connected with the piston.
Preferably, an oil discharge pipeline and an exhaust pipeline on the gas collection box are respectively connected with the oil storage box.
Preferably, the gas collecting box is connected with a test gas input interface for checking and checking the measurement accuracy of the device.
Preferably, the pipeline that measuring box and gas collection box upper portion are connected respectively with gas collection box's exhaust pipeline, test gas input interface intercommunication.
Preferably, liquid level sensors are respectively arranged in the gas collecting box and the oil storage box.
Preferably, the bottom of the measuring box is provided with a gas sensor communicated with the inner cavity of the measuring box.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable effects:
1. According to the invention, when the oil immersed transformer is in a fault state, the gas relay is automatically separated and detected, a loop formed between the gas collecting box and the measuring box is utilized, and the free gas in the pipeline is emptied through a communicating vessel principle, so that the detection precision is higher, gas component data is timely provided for the transformer protection device, and the transformer protection device is beneficial to analyzing the running state of the transformer and judging the fault type;
2. The gas sensor is arranged on the bottom surface of the measuring box, and the gas sensor does not contact transformer oil, so that the requirement on the installation environment of the gas sensor is reduced, and the measuring precision is improved; the gas sensor has wider selection range, increases gas analysis types, and can provide more detailed gas composition data;
3. The invention can also detect the measurement precision of the sensor and check the air tightness of the measuring box by injecting standard gas, and is used for checking the periodic running state and the measurement precision of the device, thereby ensuring the long-term reliable running of the device; the injection standard gas detection method can also be used for device engineering debugging, and solves the engineering debugging problem of the oil immersed transformer in the fault-free state.
Drawings
FIG. 1 is a schematic diagram of an oil and gas pipeline of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the structure of the device of the present invention;
FIG. 3 is a cross-sectional view of a measurement cassette of the apparatus of the present invention;
FIG. 4 is a cross-sectional view of an inlet aperture of a measuring cell of the device of the present invention;
FIG. 5 is a cross-sectional view of the connecting lines between the gas collecting box and the measuring box of the device of the present invention;
FIG. 6 is a schematic diagram of another oil and gas circuit of the apparatus of the present invention.
Detailed Description
The present invention is described in further detail below.
As shown in fig. 1-6, the invention provides an automatic measuring device for free gas of an oil immersed transformer, which comprises a box 16, wherein a control module 26 is arranged on the inner wall of a box door of the box 16. The gas collecting box is arranged on the left side inside the box body 16, the top of the gas collecting box 24 is connected with the gas relay connector 3 through the top of the box body 16 through a branch pipe I1, and an electromagnetic valve S1 27 is arranged on the branch pipe I1. The bottom of the gas collecting box 24 is connected with the oil storage box 21 through a branch pipe II 22, and an electromagnetic valve S2 is arranged on the branch pipe II 22. The gas collection box 24 is internally provided with a liquid level sensor L1 25, and the oil storage box 21 is internally provided with a liquid level sensor L2 19. The measuring box 10 is arranged on the right side of the gas collecting box 24 in the box body 16, the measuring box 10 is connected with the top of the gas collecting box 24 through a branch pipe III 12, and is connected with the bottom of the gas collecting box 24 through a branch pipe IV 15. The top of the gas collection box 24 is connected with the measuring box 10 by three branches: one path is connected to the measuring box 10 and is a branch pipe III 12; one path is connected to the oil storage box 21 and is a branch pipe five 9; one path is connected to the test gas input interface 4 and is a branch pipe six 6; the position where the branch pipe III 12 is communicated with the branch pipe five 9 is provided with an inclined section with an inclined angle of 135 degrees, the branch pipe is inclined to raise the communication position of the horizontal branch pipe and the vertical branch pipe, and free gas in the horizontal branch pipe can be completely emptied by utilizing liquid level difference. And the branch pipes five 9 and six 6 are respectively provided with an electromagnetic valve S3 5 and an electromagnetic valve S4 8. The top of the oil storage box 21 is provided with a branch pipe seven 14 connected with the ventilation valve 13, and free gas conveyed to the oil storage box 21 is discharged into the air from the ventilation valve 13. The bottom surface of the tank 16 is provided with a gram head 20 for external cable access, and the bottom of the oil storage box 21 penetrates through the tank body to be connected with a stop valve 18 for manual oil discharge.
As shown in fig. 3 and 4, the measuring cassette 10 includes a bottom plate 31, a cylinder 33, a top plate 34, and a piston 35. The piston 35 is mounted on the inner wall of the cylinder 33 and can move along the axis direction of the cylindrical surface of the inner cavity of the measuring box. The cylindrical surface of the piston 35 is provided with two groove assembly sealing rings 36, and a sealing gasket I32 is arranged on the matching surface of the bottom plate 31 and the cylinder 33. The sealing ring 36 and the first sealing gasket 32 construct a closed space isolated from the outside air on the upper surface of the bottom plate 31, the inner wall of the cylinder 33 and the lower surface of the piston 35, namely the inner cavity of the measuring box. The bottom plate 31 is internally provided with a through hole, the left side of the through hole passes through the bottom plate side wall connecting branch pipe III 12, and the right side of the through hole passes through the bottom plate side wall connecting branch pipe IV 15, wherein the through hole can also pass through the bottom plate connecting branch pipe IV 15 from the bottom as shown in the schematic diagram of fig. 1. An air inlet 37 of the measuring cassette 10 is arranged perpendicular to the bottom plate 31 and in the direction of the through-hole. As shown in fig. 4, a second gasket 38, an air-permeable membrane 39, an air-permeable membrane fitting nut 40, a third gasket 41, and a sealing bolt 42 are installed in this order in the axial direction of the air intake hole 37. The air-permeable membrane 39 isolates the inner cavity of the measuring box 10 from the through hole of the bottom plate 31, preventing transformer oil from entering the inner cavity. The piston is connected with an electric telescopic rod 7, and the electric telescopic rod drags the piston to linearly move. The electric telescopic rod is customized according to the stroke, and the electric telescopic rod automatically stops and cuts off the power supply after reaching the stroke limit position; and the power supply is stopped in the advancing process, and the electric telescopic rod can be locked at the power-off position. The bottom plate 31 of the measuring box 10 is provided with a gas sensor 17 and a gas pressure sensor 11 which are communicated with the inner cavity of the measuring box.
It should be noted that fig. 1 and fig. 6 are schematic diagrams of two oil and gas pipelines, and the branch pipe five 9 may be arranged as shown in fig. 1 and fig. 6, or may be arranged as shown in fig. 2; the through holes at the bottom of the measuring box can be arranged as shown in fig. 1 and 6, and can also be arranged as shown in fig. 2 and 5.
The following is the working process of the device:
A. gas collecting box for taking gas
In a normal state, the first branch pipe 1 and the second branch pipe 22 of the gas collecting box 24 are filled with transformer oil. When the transformer fails, the control module 26 receives the gas relay action signal and starts the gas taking procedure. The solenoid valve S1 and the solenoid valve S2 are opened, and the transformer oil flows into the oil storage box 21 through the gas relay interface 3, the first branch pipe 1, the solenoid valve S1, the gas collection box 24, the second branch pipe 22 and the solenoid valve S2 23. The free gas in the gas relay flows to the gas collecting box 24, the gas collecting box 24 gathers, the liquid level of the gas collecting box 24 drops, when the measured value of the liquid level sensor L1 25 is lower than a set value, the electromagnetic valve S2 and the electromagnetic valve S1 27 are closed, and the free gas collection is completed.
B. Free gas separation and measurement implementation method
As shown in fig. 5, the pipes of the top of the gas collecting box 24, the branch pipe III 12, the through hole of the bottom plate of the measuring box 10, the branch pipe IV 15 and the bottom of the gas collecting box 24 are communicated. According to the principle of communicating vessels, the liquid level of the branch pipe IV 15 and the liquid level of the gas collecting box 24 are horizontal. When the gas collection box is used for taking gas, the through holes of the bottom plates of the branch pipe III 12 and the measuring box 10 are filled with free gas, and the liquid level of the branch pipe IV 15 is equal to that of the gas collection box 24. In the process of separation and measurement of free gas, the electromagnetic valve S1 is opened, the control module 26 applies forward voltage to the electric telescopic rod 7, the electric telescopic rod 7 drags the piston 35 in the measurement box 10 to move upwards along the axial direction, free gas in the gas collection box 24 is transferred to the measurement box 10, the liquid level of the gas collection box 24 rises, when the measured value of the liquid level sensor L1 25 is larger than a set value, the control module 26 stops the power supply of the electric telescopic rod 7, and the electromagnetic valve S1 27 is closed. The control module 26 activates the gas sensor 17 to measure the gas composition; after the data is obtained, the control module 26 uploads the measurement data to a transformer protection or other control module.
C. Method for realizing evacuation of free gas
The process of exhausting free gas from the inside of the measuring box 10 is realized by the following steps: the electromagnetic valve S35 is opened, the control module 26 applies reverse voltage to the electric telescopic rod 7, the electric telescopic rod 7 drags the piston 35 in the measuring box 10 to move reversely, namely move downwards, the gas in the measuring box 10 is discharged to the oil storage box 21, and when the electric telescopic rod 7 reaches the limit position, the gas in the measuring box 10 is completely emptied.
The method for discharging the free gas in the gas collecting box 10 comprises the following steps: continuing the above process, opening the electromagnetic valve S1 27, allowing transformer oil to enter the gas collecting box 10, raising the liquid level of the gas collecting box 10 and the branch pipe IV 15, and conveying free gas in the gas collecting box 10, the branch pipe IV 15 and the branch pipe III 12 to the oil storage box 21 along the pipeline. The top of the oil storage box 21 is provided with a branch pipe seven 14 connected with the ventilation valve 13, and free gas conveyed to the oil storage box 21 is discharged into the air from the ventilation valve 13. When the liquid level change measured by the liquid level sensor L2 19 in the oil storage box 21 is larger than a set value, the gas collecting box 10, the branch pipe IV 15 and the branch pipe III 12 are filled with transformer oil, and the electromagnetic valves S1 27 and S3 5 are closed.
D. error calibration and engineering debugging implementation method
The standard gas storage bottle is connected with the test gas input interface 4, the electromagnetic valves S48 and S3 5 are opened, the standard gas is used for discharging residual gas from the six 6 branch pipes, and when the liquid level change measured by the liquid level sensor L2 19 in the oil storage box 21 is larger than a set value, the electromagnetic valve S3 5 is closed. And opening the electromagnetic valve S2, enabling standard gas in the gas storage bottle to flow into the gas collection box 10, and closing the electromagnetic valve S2 and the electromagnetic valve S48 when the liquid level sensor L1 is lower than a set value, so as to finish gas taking of the gas collection box 10. The electromagnetic valve S48 is opened, the control module 26 applies forward voltage to the electric telescopic rod 7, the electric telescopic rod 7 drags the piston 35 in the measuring box 10 to move along the axial direction, standard gas is sucked into the measuring box 10, when the electric telescopic rod reaches the limit position, the electromagnetic valve S48 is closed, the gas sensor 17 is started, the injection standard gas measuring value is obtained, and the standard gas component is compared with the standard gas component to calibrate the measuring error. The apparatus is returned to the original state by the above-described c.
E. Method for checking air tightness of measuring box
The control module 26 applies forward voltage to the electric telescopic rod 7, the electric telescopic rod 7 drags the piston 35 in the measuring box 10 to move to set displacement along the axial direction, the air pressure sensor 11 is started to obtain the pressure value of the measuring box 10, the air pressure sensor 11 is started again to obtain the pressure value of the measuring box 10 after waiting for 1 minute, the control module 26 calculates the pressure difference between two measurements, the pressure difference set value is set, and the air tightness is judged to be good. After the air tightness check is completed, the device is restored to the original state according to the method of evacuating free gas.
F. oil discharging method of oil storage box
During the above-mentioned c. evacuation of free gas, the measured value of the sensor L2 19 is greater than the upper limit of the liquid level of the oil storage tank 21, and the control module 26 sends a liquid level alarm to the transformer protection device. The worker carries the oil drum, which is placed under the shut-off valve 26, and empties the transformer oil inside the oil storage tank 21 by operating the shut-off valve 26.
Claims (6)
1. The automatic measuring device for free gas of the oil immersed transformer is characterized by comprising a box body (16) arranged on the transformer, wherein a gas collecting box (24) connected with a gas relay interface (3) and used for collecting gas is arranged in the box body (16), a measuring box (10) used for extracting the gas in the gas collecting box (24) and detecting is arranged outside the gas collecting box (24) in the box body (16), the measuring box (10) is respectively connected with the upper part and the lower part of the gas collecting box (24) to form a communication loop, and a blocking piece which is used for ventilating and blocking the oil from entering an inner cavity of the measuring box (10) is arranged at a communication interface between the measuring box (10) and the gas collecting box (24); the gas collecting box (24) is respectively connected with a gas exhaust pipeline; also comprises a control module (26);
The oil discharge pipeline on the gas collection box (24) is respectively connected with the oil storage box (21); the gas collecting box (24) and the oil storage box (21) are respectively provided with a liquid level sensor; the bottom of the gas collection box (24) is connected with the oil storage box (21) through an oil discharge pipeline of a branch pipe II (22), and an electromagnetic valve S2 (23) is arranged on the branch pipe II (22);
The measuring box (10) is connected with the top of the gas collecting box (24) through a branch pipe III (12), and is connected with the bottom of the gas collecting box (24) through a branch pipe IV (15);
The measuring box (10) comprises a bottom plate (31), a cylinder (33), a top plate (34) and a piston (35); the piston (35) is arranged on the inner wall of the air cylinder (33) and moves along the axis direction of the cylindrical surface of the inner cavity of the measuring box (10); the cylindrical surface of the piston (35) is provided with two groove assembly sealing rings (36), and a first sealing gasket (32) is arranged on the matching surface of the bottom plate (31) and the cylinder (33); the sealing ring (36) and the first sealing gasket (32) construct a closed space isolated from the outside air on the upper surface of the bottom plate (31), the inner wall of the cylinder (33) and the lower surface of the piston (35), namely the inner cavity of the measuring box; a through hole is formed in the bottom plate (31), the left side of the through hole penetrates through the bottom plate side wall to be connected with a branch pipe III (12), and the right side of the through hole penetrates through the bottom plate side wall to be connected with a branch pipe IV (15);
When free gas is separated and measured, according to the principle of a communicating vessel, the liquid level of the branch pipe IV (15) and the liquid level of the gas collecting box (24) are measured;
the bottom of the measuring box (10) is provided with a gas sensor communicated with the inner cavity of the measuring box (10).
2. The automatic measuring device for free gas of the oil immersed transformer according to claim 1, wherein a pipeline connected with the upper part of the gas collecting box (24) of the measuring box (10) is communicated with an exhaust pipeline of the gas collecting box (24).
3. The automatic measuring device for free gas of the oil immersed transformer according to claim 1, wherein a position where a pipeline connected with the upper part of the measuring box (10) and the gas collecting box (24) is communicated with an exhaust pipeline of the gas collecting box (24) is provided with an inclined section with an inclination angle larger than 90 degrees.
4. The automatic measurement device for free gas of an oil immersed transformer according to claim 1, wherein a moving element for changing the gas pressure in the measurement box (10) so as to extract the gas from the gas collecting box (24) and discharge the gas outwards is arranged in the measurement box (10); the moving element is a piston (35) arranged in the measuring box (10), and an electric telescopic rod (7) connected with the piston (35).
5. The automatic measurement device for free gas of the oil immersed transformer according to claim 1, wherein the gas collecting box (24) is connected with the test gas input interface (4) for checking and verifying the measurement accuracy of the device.
6. The automatic measuring device for free gas of the oil immersed transformer according to claim 1, wherein a pipeline connected with the upper part of the gas collecting box (24) of the measuring box (10) is respectively communicated with an exhaust pipeline of the gas collecting box (24) and the test gas input interface (4).
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| CN202110830699.4A CN113567625B (en) | 2021-07-22 | 2021-07-22 | Automatic measuring device for free gas of oil immersed transformer |
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| CN202110830699.4A CN113567625B (en) | 2021-07-22 | 2021-07-22 | Automatic measuring device for free gas of oil immersed transformer |
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| CN113567625B true CN113567625B (en) | 2024-05-24 |
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| CN114121428A (en) * | 2021-11-01 | 2022-03-01 | 金华送变电工程有限公司 | Gas collection box and transformer of application on transformer tank |
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