CN111257068B - Method and device for replacing dissolved gas in transformer oil - Google Patents
Method and device for replacing dissolved gas in transformer oil Download PDFInfo
- Publication number
- CN111257068B CN111257068B CN202010033366.4A CN202010033366A CN111257068B CN 111257068 B CN111257068 B CN 111257068B CN 202010033366 A CN202010033366 A CN 202010033366A CN 111257068 B CN111257068 B CN 111257068B
- Authority
- CN
- China
- Prior art keywords
- gas
- oil
- storage cylinder
- air
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 16
- 238000005187 foaming Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 11
- 238000007872 degassing Methods 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 4
- 210000003437 trachea Anatomy 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 262
- 239000007789 gas Substances 0.000 description 192
- 238000000605 extraction Methods 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 7
- 239000006260 foam Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000754 repressing effect Effects 0.000 description 2
- 208000031872 Body Remains Diseases 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- -1 heating stop Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N2001/1031—Sampling from special places
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a method and a device for replacing dissolved gas in transformer oil, comprising the following steps: a reservoir cylinder; the gas receiver is connected with oil storage cylinder top through first trachea to be connected with oil storage cylinder bottom through the second trachea, be equipped with on the gas receiver: a first tracheal interface; a second tracheal interface; a gas inlet; a gas outlet; the second air pipe is provided with an air pump to pump the replacement gas in the air storage cylinder into the oil storage cylinder, and the second air pipe is provided with a detection interface which is connected with detection equipment to detect and analyze the gas components of the replaced dissolved gas. The beneficial effects are that: the replacement device can take oil from the transformer, store replacement gas, enable the replacement gas to be introduced into transformer oil to replace dissolved gas, achieve oil taking and oil body degassing, integrate oil taking and degassing functions, facilitate subsequent gas component detection and analysis, avoid excessive oil paths or gas paths, reduce residues of oil bodies and gas samples, accordingly reduce influence on calibration measurement results, and guarantee detection accuracy.
Description
Technical Field
The invention relates to the technical field of gas component analysis, in particular to a method and a device for replacing dissolved gas in transformer oil.
Background
At present, the methods generally adopted in the analysis of the components of the dissolved gas in the transformer oil are weather chromatography, infrared absorption and photoacoustic spectrometry. In the detection methods, quantitative oil extraction, oil body degassing and gas sample injection are indispensable links in a gas component analysis flow. In the product realization process, the realization of the links is generally an independent functional unit, the degassing time is long, the degassing efficiency is low, and in most cases, the medium transmission among the units is realized through an oil way or an air way, so that the residues of oil bodies and gas samples are easily caused, the oil bodies enter the gas to damage the later-stage system components, the influence on the calibration measurement result is finally caused, and the equipment detection precision and the environmental adaptability are reduced.
Disclosure of Invention
The invention aims to provide a replacement device for dissolved gas in transformer oil, which integrates the functions of oil extraction and degassing and is convenient for subsequent gas component detection and analysis; the invention aims to provide a method for replacing dissolved gas in transformer oil, which integrates oil extraction and degassing functions and is convenient for subsequent gas component detection and analysis.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a replacement device for dissolved gas in transformer oil, comprising:
a storage cylinder for storing transformer oil taken from the transformer;
the oil inlet is arranged on the oil storage cylinder and is used for being communicated with the transformer so as to enable transformer oil in the transformer to enter the oil storage cylinder;
the oil outlet is arranged on the oil storage cylinder and is communicated with the transformer so as to enable transformer oil in the oil storage cylinder to flow back into the transformer;
the air reservoir is connected with the top of the oil reservoir through a first air pipe and is connected with the bottom of the oil reservoir through a second air pipe, and the air reservoir is provided with:
a first air pipe interface connected with the first air pipe;
a second air pipe interface connected with the second air pipe;
the gas inlet is used for supplying external replacement gas into the gas storage cylinder;
a gas outlet for discharging the gas in the gas storage cylinder to the atmosphere;
the air storage cylinder is used for supplying air in the oil storage cylinder to be discharged into the atmosphere through the first air pipe, the air storage cylinder and the air outlet in sequence when the oil is filled in the oil storage cylinder; the air storage cylinder is also used for supplying external replacement gas into the air storage cylinder through the gas inlet so as to store a certain amount of replacement gas; the gas storage cylinder is also used for supplying replacement gas in the gas storage cylinder to enter the gas storage cylinder through the second gas pipe when the dissolved gas in the transformer oil is replaced, and supplying the replaced dissolved gas to enter the gas storage cylinder through the first gas pipe to form gas circulation;
the second air pipe is provided with an air pump to pump the replacement gas in the air storage cylinder into the oil storage cylinder, and the second air pipe or the air storage cylinder is also provided with a detection interface which is used for being connected with detection equipment so as to detect and analyze the gas components of the replaced dissolved gas.
The beneficial effects of the technical scheme are that: through setting up oil inlet and oil-out on the oil storage jar, can make things convenient for the transformer oil to get into the oil storage jar to obtain the transformer oil of waiting to detect of a certain amount, and make the transformer oil flow back in the transformer after the detection is accomplished. The air storage cylinder is connected with the top of the oil storage cylinder through the first air pipe, the air storage cylinder is connected with the bottom of the oil storage cylinder through the second air pipe, and the air inlet and the air outlet are formed in the air storage cylinder, so that on one hand, when oil is filled in the oil storage cylinder, air in the oil storage cylinder can be conveniently discharged to the atmosphere through the first air pipe, the air storage cylinder and the air outlet in sequence, and oil is conveniently taken; on the other hand, the gas inlet is communicated with the external replacement gas, so that a certain amount of replacement gas can be stored in the gas storage cylinder; in addition, when the dissolved gas in the transformer oil is replaced, the replaced gas can conveniently enter the oil storage cylinder through the second gas pipe, and the replaced dissolved gas can enter the oil storage cylinder through the first gas pipe to be stored. The air pump arranged on the second air pipe can conveniently pump the replacement gas in the air storage cylinder into the oil storage cylinder so that the replacement process is smoothly carried out, and the detection interface arranged on the second air pipe or the air storage cylinder can conveniently detect and analyze the gas components of the subsequent dissolved gas.
Therefore, the device for replacing the dissolved gas in the transformer oil can take oil from the transformer, store the replacement gas, and introduce the replacement gas into the transformer oil to replace the dissolved gas, so that the oil taking and the oil degassing are realized, that is, the oil taking and the degassing functions are integrated, the subsequent gas component detection and analysis can be convenient, the excessive oil way or gas way arrangement is avoided, the residues of oil bodies and gas samples can be reduced, the influence on the calibration measurement result is reduced, and the detection precision is ensured.
Furthermore, in order to facilitate oil feeding, the replacement device for the dissolved gas in the transformer oil further comprises an oil feeding pipe connected with the oil inlet, and an oil pump is arranged on the oil feeding pipe.
Furthermore, for the convenience of metering, a flowmeter is also arranged on the oil inlet pipe.
Further, in order to conveniently clean the air channel, the influence of residual gas on detection and analysis is reduced, an exhaust interface communicated with the atmosphere is further arranged on the second air pipe, and the exhaust interface is used for exhausting the residual gas in the air storage cylinder before the air storage cylinder stores a certain amount of replacement gas, and then vacuumizing the air storage cylinder so as to clean the air channel.
Further, in order to improve the efficiency of the replacement process, a heating device for heating the transformer oil is arranged on the oil storage cylinder, and a temperature sensor is further arranged on the oil storage cylinder.
Further, in order to conveniently grasp the oil quantity of the transformer oil and simultaneously facilitate metering, the top of the oil storage cylinder is provided with a liquid level sensor for detecting the liquid level height of the transformer oil.
Further, in order to conveniently detect the gas pressure, and then conveniently carry out the conversion of volume under the standard atmospheric pressure, be provided with the pressure sensor that is used for detecting the gas pressure in the gas receiver on the gas receiver.
Further, in order to facilitate replacement and improve the efficiency of the replacement process, a foaming screen is arranged in the oil storage cylinder, and a plurality of foaming holes are formed in the foaming screen, so that replacement gas is uniformly introduced into the transformer oil.
The method for replacing the dissolved gas in the transformer oil comprises the following steps:
firstly, taking a certain amount of transformer oil from a transformer, storing the transformer oil in an oil storage cylinder, and in the process of oil inlet of the oil storage cylinder, enabling gas in the oil storage cylinder to be firstly discharged into the oil storage cylinder through the oil storage cylinder connected with the oil storage cylinder, and then discharging the gas into the atmosphere from the oil storage cylinder;
a second step of storing a certain amount of replacement gas in the gas storage cylinder;
and thirdly, pumping the replacement gas in the gas storage cylinder into the oil storage cylinder by using the air pump so as to replace the dissolved gas in the transformer oil, and enabling the replaced dissolved gas to enter the gas storage cylinder to form gas circulation.
The beneficial effects of the technical scheme are that: the oil storage cylinder is convenient to take oil and store, the air storage cylinder is convenient to exhaust gas in the oil inlet process of the oil storage cylinder, the air storage cylinder can store a certain amount of replacement gas, the replacement gas can be pumped into the oil storage cylinder through the air pump, so that dissolved gas in transformer oil is replaced, and the replaced dissolved gas can enter the air storage cylinder, so that the subsequent gas component detection and analysis are convenient to conduct. Therefore, the replacement method of the invention directly completes oil extraction and degassing through the oil storage cylinder and the air storage cylinder, can avoid excessive oil way or air way setting, reduces the residue of oil bodies and air samples, thereby reducing the influence on the calibration measurement result and ensuring the detection precision.
Further, in order to facilitate cleaning of the gas path and reduce the influence of residual gas on detection and analysis, in the second step, the residual gas in the gas storage cylinder is discharged first, the gas storage cylinder is vacuumized, and then a certain amount of replacement gas is stored in the gas storage cylinder.
Drawings
FIG. 1 is a schematic diagram of a device for replacing dissolved gas in transformer oil according to the present invention;
FIG. 2 is a block diagram of a replacement flow of a dissolved gas replacement device in transformer oil according to the present invention;
FIG. 3 is a top view of the foam screen of FIG. 1;
FIG. 4 is a front view of the foam screen of FIG. 1;
FIG. 5 is a front view of the air reservoir of FIG. 1;
FIG. 6 is a front view of the cylinder block of the air reservoir of FIG. 5;
FIG. 7 is a left side view of the cylinder block of the air reservoir of FIG. 5;
FIG. 8 is a bottom view of the cylinder block of the air reservoir of FIG. 5;
FIG. 9 is a top view of the cylinder block of the air reservoir of FIG. 5;
FIG. 10 is a front view of a cylinder head of the air reservoir of FIG. 5;
FIG. 11 is a bottom view of the cylinder head of the air reservoir of FIG. 5;
FIG. 12 is a top view of a cylinder head of the air reservoir of FIG. 5;
fig. 13 is a schematic structural diagram of a main control board of a device for replacing dissolved gas in transformer oil according to the present invention.
In the figure: 1-a transformer; 2-an oil outlet pipe; 3-a transformer stop valve; 4-an oil pump; 5-a flow meter; 6-an oil inlet electromagnetic valve; 7-heating the belt; 8-an oil storage cylinder; 9-an oil return electromagnetic valve; 10-an upper cover of the oil storage cylinder; 11-a liquid level sensor; 12-an oil cylinder top electromagnetic valve; 13-an air reservoir; 131-a cylinder; 1311-first fixation holes; 1312-sensor fixing holes; 1313-gas inlet; 1314-second tracheal interface; 1315-a first tracheal interface; 1316-upper seal groove; 1317-air cavities; 1318-second fixation holes; 132—a cylinder head; 1321-gas outlet; 1322-oil guiding chamber; 1323-third fixing hole; 1324-lower seal groove; 133-sealing ring; 14-a pressure sensor; 15-a cylinder top electromagnetic valve; 16-an air outlet electromagnetic valve; 17-a cylinder bottom electromagnetic valve; 18-a temperature sensor; 19-an air pump; 20-a three-way joint; 21-a sample gas solenoid valve; 22-an exhaust solenoid valve; 23-a second trachea; 24-an oil cylinder bottom electromagnetic valve; 25-a foam screen; 251-foaming the cells; 252-bolt perforation; 253-air gathering cavity; 26-a lower cover of the oil storage cylinder; 27-a bolt; 28-an oil inlet pipe; 29-first trachea.
Detailed Description
An embodiment of the device for displacing dissolved gas in transformer oil according to the invention is shown in fig. 1 and comprises a reservoir 8, the reservoir 8 being intended for storing transformer oil taken from the transformer 1. The oil storage cylinder 8 is provided with an oil storage cylinder upper cover 10 and an oil storage cylinder lower cover 26, an oil inlet and an oil outlet are arranged on the side wall of the oil storage cylinder 8, an oil inlet pipe 28 is connected to the oil inlet, an oil outlet pipe 2 is connected to the oil outlet, and the other ends of the oil inlet pipe 28 and the oil outlet pipe 2 are respectively connected with a transformer stop valve 3 on the transformer 1. The oil inlet pipe 28 is provided with an oil pump 4, a flowmeter 5 and an oil inlet electromagnetic valve 6, and the oil outlet pipe 2 is provided with an oil return electromagnetic valve 9.
The device for replacing dissolved gas in the transformer oil further comprises an air storage cylinder 13, the air storage cylinder 13 is connected with the top of the oil storage cylinder 8 through a first air pipe 29, and an oil cylinder top electromagnetic valve 12 is arranged on the first air pipe 29. As shown in fig. 5 and 6, the air reservoir 13 is provided with a first air pipe joint 1315, and correspondingly, the upper cover 10 of the air reservoir is also provided with a first air pipe joint.
The air reservoir 13 is further connected to the bottom of the oil reservoir 8 through a second air pipe 23, and as shown in fig. 5 and 6, a second air pipe port 1314 is provided on the air reservoir 13, and correspondingly, a second air pipe port is also provided on the lower cover 26 of the oil reservoir. The second air pipe 23 is sequentially provided with an air outlet electromagnetic valve 16, an air pump 19, a three-way joint 20 and an oil cylinder bottom electromagnetic valve 24, wherein the outlet of a branch pipe of the three-way joint 20 is connected with two air paths, one air path is provided with a sample air electromagnetic valve 21, and the other air path is used for being connected with detection equipment so as to detect and analyze the gas components of the dissolved gas which are oppositely discharged. The other air passage is provided with an exhaust electromagnetic valve 22, and the air passage is communicated with the atmosphere.
As shown in fig. 5, the air storage cylinder 13 is composed of a cylinder body 131 and a cylinder cover 132, and as shown in fig. 6-9, an air cavity 1317 is formed in the cylinder body 131, a second fixing hole 1318 is formed in the cylinder body 131, and as shown in fig. 10-12, a third fixing hole 1323 is correspondingly formed in the cylinder cover 132, the specific second fixing hole 1318 is a threaded hole, the third fixing hole 1323 is a light hole, and the fixed connection of the cylinder body and the cylinder cover is realized through a bolt. In order to ensure the tightness of the air reservoir, an upper sealing groove 1316 is arranged on the cylinder body 131, a lower sealing groove 1324 is correspondingly arranged on the cylinder cover 132, and the upper sealing groove and the lower sealing groove are combined to form a mounting cavity for mounting the sealing ring 133.
The top of the cylinder 131 is provided with a first fixing hole 1311 for fixing the air reservoir 13 to a frame or other equipment platform. In addition, a sensor fixing hole 1312 and a gas inlet 1313 are provided at the top of the cylinder 131, the sensor fixing hole 1312 is used for installing and fixing the pressure sensor 14, a gas inlet pipe is connected to the gas inlet 1313, a cylinder top solenoid valve 15 is provided to the gas inlet pipe, and the gas inlet pipe is used for connecting an external replacement gas, which may be air or nitrogen in the present invention.
The top surface of cylinder cap 132 is provided with the toper recess, and this recess forms oil guide chamber 1322, and oil guide chamber 1322 can make the fluid sediment gathering in the gas that mixes wherein, is provided with the gas outlet 1321 with oil guide chamber 1322 intercommunication on the cylinder cap 132, is connected with the outlet duct on the gas outlet 1321, is provided with cylinder bottom solenoid valve 17 on the outlet duct, and the outlet duct is used for communicating with the atmosphere to discharge deposited fluid, can supply the gas in the gas receiver 13 to discharge to the atmosphere simultaneously.
As shown in fig. 1, a heating belt 7 for heating the transformer oil is provided on the outer wall of the reserve cylinder 8, and a temperature sensor 18 is provided on the reserve cylinder 8. The upper cover 10 of the oil storage cylinder is also provided with a liquid level sensor 11 for detecting the liquid level of the transformer oil.
The bottom in the reservoir cylinder 8 is fixed with the foam screen 25, and as shown in fig. 3 and 4, the foam screen 25 is disc-shaped as a whole, bolt through holes 252 are provided on the foam screen 25, and the foam screen 25 can be fixed on the reservoir cylinder lower cover 26 by using bolts 27 to pass through the bolt through holes 252. The foaming screen 25 is provided with a plurality of foaming holes 251, and a recess is provided on the bottom surface of the foaming screen 25, the recess forming a gas-collecting chamber 253, the gas-collecting chamber 253 communicating with each foaming hole 251. After the gas is introduced into the gas-collecting chamber 253, it is redispersed into each of the bubbling holes 251, so that the generated bubbling is more dispersed and uniform.
The device for replacing the dissolved gas in the transformer oil also comprises a main control system, wherein the main control system consists of a power input module, a heating output module, a pump body control module, a valve body control output module, a sensor digital access module, a sensor analog access module, an external communication module, a main control core module and a control and algorithm process for completing support function realization. Specifically, the main control system comprises a main control board, and as shown in fig. 13, the main control board is provided with a main control core board, a valve body control output port, a pump body control output port, a power supply access port, a heating output port, an external communication port, a sensor access analog port and a sensor access digital port. That is, the various pump bodies, valve bodies, sensors, flow meters and heating belts are all controlled by the main control board.
The working principle of the device for replacing dissolved gas in the transformer oil is that as shown in fig. 2, the whole flow of the method for replacing dissolved gas in the transformer oil in the invention is as follows: the method comprises the steps of circulating oil extraction, oil cylinder exhaust, quantitative oil extraction, gas circuit cleaning, quantitative gas extraction, constant-temperature heating of an oil body, gas circulation, oil gas standing, displacement gas metering, quantitative pushing of sample gas, heating stop, oil circuit repressing and gas circuit repressing.
The detailed implementation process is as follows:
firstly, circularly taking oil and exhausting the oil cylinder.
And opening the two transformer stop valves 3, and controlling the oil inlet electromagnetic valve 6, the oil return electromagnetic valve 9 and the oil pump 4 to open forward by a main control board, gradually introducing transformer oil into the oil storage cylinder 8, and starting timing by the main control board to realize the oil flow direction of S- > F- > M- > G- > S. During timing, the liquid level sensor 11 continuously detects the liquid level (distance between the liquid level and the liquid level sensor) in the oil storage cylinder 8, when the height is greater than a set value of 5mm, the cylinder top electromagnetic valve 12 and the cylinder bottom electromagnetic valve 17 are opened and closed rapidly at intervals of 1 minute, the air flow direction is N- > H- > Q- > B, the air in the oil storage cylinder 8 can be discharged into the atmosphere in time through the first air pipe 29, the air storage cylinder 13 and the cylinder bottom electromagnetic valve 17 in the oil inlet process, and smooth oil inlet is further guaranteed.
When the height is detected to be less than 5mm and the time for meeting the requirement reaches the set value for 15 minutes, the main control board controls the oil inlet electromagnetic valve 6, the oil return electromagnetic valve 9 and the oil pump 4 to be closed, so that the circulation oil taking and the oil cylinder exhausting are completed, in the process, as long as the pressure in the oil storage cylinder 8 reaches a certain pressure, the oil body can flow back to the transformer through the oil return electromagnetic valve 9, and through the circulation for a period of time, the whole replacement of the oil body in the oil storage cylinder 8 can be realized, and the accuracy of the subsequent detection and analysis is ensured. Of course, this is the case when the oil body is originally left in the reserve cylinder 8, and if the test is the first time, it does not take too long to circulate.
It should be noted that when the height is detected to be less than 5mm, the cylinder top solenoid valve 12 and the cylinder bottom solenoid valve 17 are closed, and when the height is detected to be less than 5mm, it is not necessary to open the two valve bodies again because most of the gas is exhausted.
Then quantitatively taking oil.
After the circulation oil extraction and the oil cylinder exhaust are completed, the oil storage cylinder 8 is basically filled with transformer oil, then the main control board opens the oil inlet electromagnetic valve 6, and opens the oil pump 4 to reversely run, so that the oil flow direction is M- > F- > S, and simultaneously, the flowmeter 5 and the liquid level sensor 11 are opened to calculate the flow, and the volume of the discharged oil body is calculated. The flow meter 5 is used as a main component, the liquid level sensor 11 is used as an auxiliary component, the flow volume is calculated by the product of the pulse number and the single pulse volume, the liquid level sensor 11 is used for calculating the flow volume by the product of the liquid level distance and the bottom area of the cylinder body of the oil storage cylinder 8, after the volume of the discharged oil body is calculated, the volume of the discharged oil body, namely the volume of the oil body left in the oil storage cylinder 8, namely the oil body needing to quantitatively take oil is subtracted from the fixed volume of the oil storage cylinder 8.
The calculation process is operated by an algorithm program set on the main control board, and when the calculated flow reaches a set value V1, the oil pump 4 and the oil inlet electromagnetic valve 6 are sequentially closed to finish quantitative oil extraction.
And then cleaning the gas path.
After the quantitative oil extraction is completed, the main control board sequentially opens and closes the cylinder top electromagnetic valve 15 and the cylinder bottom electromagnetic valve 17 to realize the airflow direction of A- > Q- > B, so that a small amount of oil bodies mixed into the gas and deposited and accumulated in the oil guide cavity 1322 can be discharged.
After that, the main control board sequentially opens the cylinder top electromagnetic valve 15, the air outlet electromagnetic valve 16, the air pump 19 and the air outlet electromagnetic valve 22, and starts timing, wherein the cylinder top electromagnetic valve 15 is connected with a nitrogen gas source (as a replacement gas in the embodiment), the air outlet electromagnetic valve 22 is communicated with the atmosphere, and the air flow direction is A- > Q- > D, so that irrelevant gas remained in the air storage cylinder 13 is discharged to the atmosphere. After the set time is 1 minute, the cylinder top electromagnetic valve 15 is closed so as to block the nitrogen gas source, the air pump 19 still continues to operate at the moment, the air storage cylinder 13 is vacuumized, the air flow direction is Q < - > D, in the process, the pressure sensor 14 measures the pressure in the air storage cylinder 13, and after the pressure value (negative pressure) is reached, the air outlet electromagnetic valve 16, the air pump 19 and the air exhaust electromagnetic valve 22 are sequentially closed, so that the air path cleaning is completed.
Then quantitatively taking out the gas. The implementation principle of the flow is as follows: and injecting pressure gas into the fixed volume, and calculating through a gas balance equation to realize the conversion of the volume under the standard pressure, thereby realizing quantitative gas taking.
Specifically, after the gas circuit cleaning is completed, the cylinder top electromagnetic valve 15 is quickly opened and closed for 4 times, nitrogen is introduced into the gas storage cylinder 13 until the pressure reaches the required pressure, then the cylinder top electromagnetic valve 12 is opened for 3 seconds, the pressures in the gas storage cylinder 8 and the gas storage cylinder 13 are balanced, and the gas flow direction is A- > Q- > H- > N. And then closing the cylinder top electromagnetic valve 12, rapidly opening and closing the cylinder top electromagnetic valve 15 again, opening the cylinder top electromagnetic valve 12 again after the pressure reaches the requirement, balancing the pressure again, and recording the current pressure value and the temperature value.
According to the gas balance equation, the volume of the air storage cylinder 13 and the oil discharge volume V1, calculating a volume value Vm0 under standard atmospheric pressure corresponding to nitrogen stored in the air storage cylinder 13 and the top of the oil storage cylinder 8, and finishing the quantitative air taking operation. In the air taking process, if the pressure exceeds the standard, the pressure is regulated by rapidly opening and closing the electromagnetic valve 17 at the bottom of the cylinder.
Then the oil body is heated at constant temperature. The principle of the flow is as follows: the temperature control unit heats the oil storage cylinder 8 through the heating belt 7 under the feedback of the signal of the temperature sensor 18, and keeps the temperature constant.
Specifically, after the quantitative gas taking is completed, the main control board supplies power to the heating belt 7 arranged on the rigid body for heating, and the temperature feedback is realized through the temperature sensor 18 arranged on the oil storage cylinder 8. The constant-temperature heating of the oil body can improve the oil temperature of the transformer oil, so that the dissolved gas in the transformer oil is easier to replace, and the replacement efficiency is improved.
Then the gas is circulated. The principle of the flow is as follows: the nitrogen gas sealed in the oil storage cylinder 8 and the air storage cylinder 13 is driven by the air pump 19 to pass through the foaming screen 25 to generate a large number of bubbles, and the bubbles flow through the oil body from bottom to top in a reciprocating manner, so that the bubbles are replaced with dissolved gas in the oil body, the replaced dissolved gas enters the air storage cylinder through the first air pipe, and then is injected into the oil storage cylinder 8 again through the second air pipe by the air storage cylinder, so that gas circulation is realized.
Specifically, after the quantitative gas taking and the constant-temperature heating of the oil body are completed, the main control board sequentially opens the oil cylinder top electromagnetic valve 12, the gas outlet electromagnetic valve 16, the gas pump 19 and the oil cylinder bottom electromagnetic valve 24, starts timing, and carries out gas circulation to realize the gas flow direction of N- > H- > Q- > E- > M- > N. After the timing reaches the set value for 15 minutes, the air pump 19, the oil cylinder top electromagnetic valve 12, the air outlet electromagnetic valve 16 and the oil cylinder bottom electromagnetic valve 24 are sequentially closed.
Then the oil gas is kept stand. After the gas circulation is completed, the oil and gas are not balanced, and the time is needed for waiting, and the time is counted for 10 minutes, so that the oil and gas are balanced after replacement.
Then displacement gas metering. The flow principle is as follows: and (3) carrying out volume calculation on the gas after standing under standard gas pressure by a gas balance equation. After the oil gas standing time reaches the specified time, the current temperature value and the current pressure value are collected, and the volume value Vm1 under the standard air pressure corresponding to the current cavity is calculated and recorded according to an air balance equation.
Then quantitatively pushing the sample gas. The flow principle is as follows: the displaced gas is delivered to subsequent detection equipment through the gas pump 19, the volume value aiming at standard gas pressure is calculated through a gas balance equation, and quantitative pushing of the sample gas is carried out.
The implementation method comprises the following steps: after the main control board sequentially opens the cylinder top electromagnetic valve 12, the air outlet electromagnetic valve 16 and the sample air electromagnetic valve 21, the air pump 19 is opened and closed repeatedly and rapidly, the air flow direction N- > H- > Q- > C is realized, the pressure measurement is carried out through the pressure sensor 14, the residual standard air pressure volume value and the residual exhaust air volume value in the current cavity are calculated in real time until the set output air volume value Voutset is reached, and then the cylinder top electromagnetic valve 12, the air outlet electromagnetic valve 16, the sample air electromagnetic valve 21 and the air pump 19 are closed, so that the quantitative pushing of the air sample is completed. If the sample gas is required to be pushed for a plurality of times, repeating the process.
Then the heating is stopped. After the quantitative pushing of the sample gas is completed, the main control board stops supplying power to the heating belt 7.
Then the oil way is re-pressurized. The flow principle is as follows: the oil pressure in the oil storage cylinder 8 is balanced to the oil pressure in the transformer 1, and the oil in the oil storage cylinder 8 is circulated into the transformer 1.
The implementation method comprises the following steps: and the main control board performs the operations of circularly taking oil and exhausting the oil cylinder, starts timing until reaching a set time value, and completes the oil circuit repression.
Then the air path is re-pressurized. The flow principle is as follows: the gas in the gas storage cylinder 13 is balanced to the atmospheric pressure, and the residual gas of the replacement gas is discharged. The implementation method comprises the following steps: the main control board sequentially opens and closes the cylinder top electromagnetic valve 15 and the cylinder bottom electromagnetic valve 17; the air flow direction is A- > Q- > B. Then executing the air path cleaning process, and then opening and closing the electromagnetic valve 17 at the bottom of the cylinder for multiple times and rapidly to balance the pressure with the outside atmosphere.
After the above process is completed, the gas replacement process is ended. The above-mentioned volume values Vm0, vm1, voutset are used in the calibration and metering of the gas components of the subsequent system.
In other embodiments of the device for displacing the dissolved gas in the transformer oil or the method for displacing the dissolved gas in the transformer oil, no frothing screen is provided in the reservoir, and the displaced gas is directly introduced into the reservoir.
In other embodiments of the device for replacing the dissolved gas in the transformer oil or the method for replacing the dissolved gas in the transformer oil, the air storage cylinder is not provided with a pressure sensor, and the pressure sensor can be arranged at the top of the oil storage cylinder or is not provided with the pressure sensor, so that the corresponding volume value under the standard atmospheric pressure is not accurately calculated, and the air taking amount is roughly estimated through the air taking time.
In other embodiments of the device for replacing dissolved gas in transformer oil or the method for replacing dissolved gas in transformer oil, the top of the oil storage cylinder is not provided with a liquid level sensor, and the discharge flow is calculated only by a flowmeter, or the flowmeter is not provided, so that the oil storage cylinder can be made transparent, and the quantity of the transformer oil can be controlled by visual inspection.
In other embodiments of the device for replacing dissolved gas in transformer oil or the method for replacing dissolved gas in transformer oil, the oil storage cylinder is not provided with a heating device and a temperature sensor, at this time, the corresponding volume value under standard atmospheric pressure is not accurately calculated, and the replacement of the dissolved gas is performed at room temperature.
In other embodiments of the device for replacing the dissolved gas in the transformer oil or the method for replacing the dissolved gas in the transformer oil, the second air pipe is not provided with a three-way joint, and two air paths provided with the sample air electromagnetic valve and the exhaust electromagnetic valve are respectively and independently connected with the second air pipe, and at the moment, the second air pipe is respectively provided with two interfaces, namely a detection interface and an exhaust interface.
In other embodiments of the device for displacing the dissolved gas in the transformer oil or the method for displacing the dissolved gas in the transformer oil, the detection port is arranged on the gas reservoir.
In other embodiments of the device for displacing the dissolved gas in the transformer oil or the method for displacing the dissolved gas in the transformer oil, the second gas pipe is not provided with a gas outlet, and the step of cleaning the gas path is omitted.
In other embodiments of the replacement device for the dissolved gas in the transformer oil or the replacement method for the dissolved gas in the transformer oil, the oil inlet pipe and the oil pump on the oil inlet pipe are not part of the replacement device, but are arranged on the transformer or are arranged on the replacement device before the start of the test.
In other embodiments of the replacement device for the dissolved gas in the transformer oil or the replacement method for the dissolved gas in the transformer oil, when the replacement device is used for the first time and no oil body remains in the oil storage cylinder, the oil is not required to be circularly extracted, namely, an oil return electromagnetic valve is not required to be opened during oil extraction, the oil inlet electromagnetic valve is directly opened to enable the transformer oil to enter the oil storage cylinder, and at the moment, the circularly extracted oil, the exhausting of the oil cylinder and the quantitatively extracted oil can be combined into one step, and the steps of directly extracting the oil and exhausting of the oil cylinder are directly realized, and at the moment, the quantitative oil extraction can be directly realized through a flowmeter.
Claims (7)
1. A replacement device for dissolved gas in transformer oil, comprising:
a storage cylinder for storing transformer oil taken from the transformer;
the oil inlet is arranged on the oil storage cylinder and is used for being communicated with the transformer so as to enable transformer oil in the transformer to enter the oil storage cylinder;
the oil outlet is arranged on the oil storage cylinder and is communicated with the transformer so as to enable transformer oil in the oil storage cylinder to flow back into the transformer;
the air reservoir is connected with the top of the oil reservoir through a first air pipe and is connected with the bottom of the oil reservoir through a second air pipe, and the air reservoir is provided with:
a first air pipe interface connected with the first air pipe;
a second air pipe interface connected with the second air pipe;
the gas inlet is used for supplying external replacement gas into the gas storage cylinder;
a gas outlet for discharging the gas in the gas storage cylinder to the atmosphere;
the air storage cylinder is used for supplying air in the oil storage cylinder to be discharged into the atmosphere through the first air pipe, the air storage cylinder and the air outlet in sequence when the oil is filled in the oil storage cylinder; the gas storage cylinder is also used for supplying external replacement gas into the gas storage cylinder through a gas inlet so as to store a certain amount of replacement gas, a pressure sensor used for detecting the pressure of the gas in the gas storage cylinder is arranged on the gas storage cylinder, and a liquid level sensor used for detecting the liquid level of transformer oil is arranged at the top of the oil storage cylinder; the gas storage cylinder is also used for supplying replacement gas in the gas storage cylinder to enter the gas storage cylinder through the second gas pipe when the dissolved gas in the transformer oil is replaced, and supplying the replaced dissolved gas to enter the gas storage cylinder through the first gas pipe to form gas circulation;
the second air pipe is provided with an air pump for pumping the replacement gas in the air storage cylinder into the oil storage cylinder, and the second air pipe or the air storage cylinder is also provided with a detection interface which is used for being connected with detection equipment so as to detect and analyze the gas components of the replaced dissolved gas;
the device for replacing the dissolved gas in the transformer oil further comprises an oil inlet pipe connected with the oil inlet, and an oil pump is arranged on the oil inlet pipe, or the oil inlet is used for being connected with the oil inlet pipe provided with the oil pump.
2. The replacement device for dissolved gas in transformer oil according to claim 1, wherein a flowmeter is further arranged on the oil inlet pipe.
3. The replacement device for dissolved gas in transformer oil according to claim 1 or 2, wherein the second air pipe is further provided with an exhaust port communicated with the atmosphere, and the exhaust port is used for exhausting residual gas in the air reservoir before the air reservoir stores a certain amount of replacement gas, and then vacuumizing the air reservoir to clean the air channel.
4. The replacement device for dissolved gas in transformer oil according to claim 1 or 2, wherein a heating device for heating the transformer oil is arranged on the oil storage cylinder, and a temperature sensor is also arranged on the oil storage cylinder.
5. The replacement device for dissolved gas in transformer oil according to claim 1 or 2, wherein a foaming screen is arranged in the oil storage cylinder, and a plurality of foaming holes are formed in the foaming screen so that the replacement gas is uniformly introduced into the transformer oil.
6. A method for replacing dissolved gas in transformer oil, characterized in that the device for replacing dissolved gas in transformer oil according to any one of claims 1 to 5 is used, comprising the following steps:
firstly, taking a certain amount of transformer oil from a transformer, storing the transformer oil in an oil storage cylinder, and in the process of oil inlet of the oil storage cylinder, enabling gas in the oil storage cylinder to be firstly discharged into the oil storage cylinder through the oil storage cylinder connected with the oil storage cylinder, and then discharging the gas into the atmosphere from the oil storage cylinder to realize the gas discharge of the oil storage cylinder; then discharging the transformer oil in the oil storage cylinder, and calculating the volume of the discharged oil body to obtain the oil discharge volume;
secondly, storing a certain amount of replacement gas in the gas storage cylinder, and determining the amount of the replacement gas according to the volume of oil discharged in the oil storage cylinder, the volume of the gas storage cylinder and a gas balance equation;
and thirdly, pumping the replacement gas in the gas storage cylinder into the oil storage cylinder by using the air pump so as to replace the dissolved gas in the transformer oil, and enabling the replaced dissolved gas to enter the gas storage cylinder to form gas circulation.
7. The method for replacing dissolved gas in transformer oil according to claim 6, wherein in the second step, the residual gas in the gas storage tank is discharged first, the gas storage tank is evacuated, and then a certain amount of replacement gas is stored in the gas storage tank.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911008336 | 2019-10-22 | ||
| CN2019110083361 | 2019-10-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111257068A CN111257068A (en) | 2020-06-09 |
| CN111257068B true CN111257068B (en) | 2024-02-06 |
Family
ID=70953137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010033366.4A Active CN111257068B (en) | 2019-10-22 | 2020-01-13 | Method and device for replacing dissolved gas in transformer oil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111257068B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378719B (en) * | 2020-11-06 | 2023-04-18 | 国电南京自动化股份有限公司 | Transformer standard oil sample configuration device and configuration method thereof |
| CN115235855B (en) * | 2022-09-21 | 2022-12-16 | 广东工业大学 | Degassing device, degassing method and gas detection system in transformer oil |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627408A (en) * | 1985-07-02 | 1987-01-14 | Ulvac Corp | Apparatus for recirculating and purifying pump oil of hydraulic rotary pump for vacuum processing apparatus |
| JPH05288654A (en) * | 1992-04-13 | 1993-11-02 | Mitsubishi Electric Corp | Apparatus and method for sampling concentration of minute amount of dissolved gas |
| JP2003154205A (en) * | 2001-11-20 | 2003-05-27 | Hitachi Industries Co Ltd | Oil separating apparatus |
| JP2004022692A (en) * | 2002-06-14 | 2004-01-22 | Mitsubishi Electric Corp | Apparatus for extracting gas dissolved in oil |
| JP2006029913A (en) * | 2004-07-14 | 2006-02-02 | Mitsubishi Electric Plant Engineering Corp | Monitor for dissolved gas in oil |
| JP2006159142A (en) * | 2004-12-10 | 2006-06-22 | Hitachi Industries Co Ltd | Oil-water separation method and oil-water separator |
| CN101498690A (en) * | 2009-02-19 | 2009-08-05 | 上海交通大学 | Online fault monitoring system for power transformer |
| CN101629934A (en) * | 2009-07-16 | 2010-01-20 | 思源电气股份有限公司 | Chromatography online monitoring system for transformer oil |
| CN103157345A (en) * | 2013-03-07 | 2013-06-19 | 西安交通大学 | Oil circulation gas purification apparatus based on molecule intermiscibility and purification method |
| CN103293251A (en) * | 2013-05-28 | 2013-09-11 | 北京华电云通电力技术有限公司 | Automatic and rapid oil-gas separation device for oil chromatographic analysis pretreatment |
| CN203595689U (en) * | 2013-09-23 | 2014-05-14 | 国家电网公司 | Simulation system for chromatographic on-line detection of transformer oil gas |
| CN104236985A (en) * | 2014-09-12 | 2014-12-24 | 广西电网公司电力科学研究院 | Oil-gas separator for monitoring gas dissolved in transformer oil on line |
| CN204389455U (en) * | 2014-12-08 | 2015-06-10 | 南京阿克赛斯科技有限公司 | Fully automatic vacuum infiltration degasser |
| CN105510104A (en) * | 2016-02-05 | 2016-04-20 | 毛灿松 | On-line separation device with changeable degassing amount for gases in insulating oil and wall-mounted analysic system |
| CN205516645U (en) * | 2016-01-08 | 2016-08-31 | 中国南方电网有限责任公司超高压输电公司 | Converter transformer on -line monitoring oil -gas separation device |
| CN106178608A (en) * | 2016-08-27 | 2016-12-07 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Dynamic headspace degasser |
| CN205948435U (en) * | 2016-08-27 | 2017-02-15 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Developments head space degasser |
-
2020
- 2020-01-13 CN CN202010033366.4A patent/CN111257068B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627408A (en) * | 1985-07-02 | 1987-01-14 | Ulvac Corp | Apparatus for recirculating and purifying pump oil of hydraulic rotary pump for vacuum processing apparatus |
| JPH05288654A (en) * | 1992-04-13 | 1993-11-02 | Mitsubishi Electric Corp | Apparatus and method for sampling concentration of minute amount of dissolved gas |
| JP2003154205A (en) * | 2001-11-20 | 2003-05-27 | Hitachi Industries Co Ltd | Oil separating apparatus |
| JP2004022692A (en) * | 2002-06-14 | 2004-01-22 | Mitsubishi Electric Corp | Apparatus for extracting gas dissolved in oil |
| JP2006029913A (en) * | 2004-07-14 | 2006-02-02 | Mitsubishi Electric Plant Engineering Corp | Monitor for dissolved gas in oil |
| JP2006159142A (en) * | 2004-12-10 | 2006-06-22 | Hitachi Industries Co Ltd | Oil-water separation method and oil-water separator |
| CN101498690A (en) * | 2009-02-19 | 2009-08-05 | 上海交通大学 | Online fault monitoring system for power transformer |
| CN101629934A (en) * | 2009-07-16 | 2010-01-20 | 思源电气股份有限公司 | Chromatography online monitoring system for transformer oil |
| CN103157345A (en) * | 2013-03-07 | 2013-06-19 | 西安交通大学 | Oil circulation gas purification apparatus based on molecule intermiscibility and purification method |
| CN103293251A (en) * | 2013-05-28 | 2013-09-11 | 北京华电云通电力技术有限公司 | Automatic and rapid oil-gas separation device for oil chromatographic analysis pretreatment |
| CN203595689U (en) * | 2013-09-23 | 2014-05-14 | 国家电网公司 | Simulation system for chromatographic on-line detection of transformer oil gas |
| CN104236985A (en) * | 2014-09-12 | 2014-12-24 | 广西电网公司电力科学研究院 | Oil-gas separator for monitoring gas dissolved in transformer oil on line |
| CN204389455U (en) * | 2014-12-08 | 2015-06-10 | 南京阿克赛斯科技有限公司 | Fully automatic vacuum infiltration degasser |
| CN205516645U (en) * | 2016-01-08 | 2016-08-31 | 中国南方电网有限责任公司超高压输电公司 | Converter transformer on -line monitoring oil -gas separation device |
| CN105510104A (en) * | 2016-02-05 | 2016-04-20 | 毛灿松 | On-line separation device with changeable degassing amount for gases in insulating oil and wall-mounted analysic system |
| CN106178608A (en) * | 2016-08-27 | 2016-12-07 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Dynamic headspace degasser |
| CN205948435U (en) * | 2016-08-27 | 2017-02-15 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Developments head space degasser |
Non-Patent Citations (2)
| Title |
|---|
| 天然气水合物注二氧化碳置换程度计算新模型;张杰;陈花;关富佳;肖娜;;天然气与石油(第03期);全文 * |
| 砂岩气顶油藏改建储气库库容计算方法;王皆明;姜凤光;;天然气工业(第11期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111257068A (en) | 2020-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111257068B (en) | Method and device for replacing dissolved gas in transformer oil | |
| CN103545478B (en) | Injecting electrolytic solution system and electrolyte filling method | |
| CN102369434B (en) | Liquid chromatograph | |
| CN104713994B (en) | For the analytical equipment for the digestion parameter for determining fluid sample | |
| US20130104668A1 (en) | Method and apparatus for measuring volume flow rate of liquid flowing into a container and/or volume of liquid which has flowed into the container | |
| GB2440834B (en) | Liquid injecting method and liquid container | |
| CN106052978A (en) | Pressure vessel air tightness detection device and method | |
| JPH10300626A (en) | Method and system for inspecting leakage | |
| CN108827552B (en) | System and method for detecting sealing performance of lithium battery after liquid injection | |
| CN104865109A (en) | Quantitative air inlet method of transformer oil and sample compounding device thereof | |
| CN112526003B (en) | Automatic pouring and recycling device and method for couplant of ultrasonic probe | |
| CN110082439A (en) | A kind of Smart Verify storage device with the calibrating of oil chromatography on-Line Monitor Device on site | |
| CN103513011A (en) | Automatic calibration device for gas in transformer oil | |
| CN203881499U (en) | Leak detection device for firefighting bottle | |
| CN212646334U (en) | Water pressure intensity loading device | |
| CN107041752B (en) | Weighing type vital capacity measuring device | |
| CN208223759U (en) | A kind of air tightness test-bed of oil storage cylinder | |
| CN109110721B (en) | Vacuum-pumping oil-filling system and method for hydraulic spring operating mechanism | |
| CN115301620B (en) | Cleaning method and cleaning tool for negative pressure component for battery formation | |
| ITTV20120212A1 (en) | IMPROVED FERMENTER | |
| CN110207910B (en) | Automatic valve leakage rate testing device comprising exhaust unit | |
| CN112582763A (en) | Automatic electrolyte supply device for vacuum degassing and method for supplying electrolyte by using same | |
| CN109141767B (en) | Air tightness detection device and method for pantograph carbon slide plate | |
| CN204666420U (en) | Transformer oil quantitative air inlet method sample preparation device | |
| CN212340776U (en) | High-tightness gas sampling and odor evaluation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |