CN117723647A - Device for checking on-line monitoring accuracy of dissolved gas in oil - Google Patents
Device for checking on-line monitoring accuracy of dissolved gas in oil Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 71
- 238000000926 separation method Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000012795 verification Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 268
- 239000007788 liquid Substances 0.000 claims description 44
- 238000004891 communication Methods 0.000 claims description 15
- 239000012159 carrier gas Substances 0.000 claims description 12
- 238000012806 monitoring device Methods 0.000 description 37
- 238000012360 testing method Methods 0.000 description 35
- 238000004587 chromatography analysis Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007872 degassing Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009849 vacuum degassing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003862 health status Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004164 analytical calibration Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a device for checking the accuracy of online monitoring of dissolved gas in oil, and relates to the technical field of online monitoring equipment; the device comprises an oil-gas separation unit, a gas detection unit and a measurement and control unit which are sequentially connected, wherein the oil-gas separation unit comprises a sampling unit, a first quantitative unit and a pushing unit, the sampling unit is connected with the first quantitative unit, the pushing unit is connected with the gas separation unit through the first quantitative unit, the device further comprises a verification unit, the verification unit comprises a standard gas cylinder and a second quantitative unit, the standard gas cylinder is connected with the second quantitative unit, and the pushing unit is connected with the gas separation unit through the second quantitative unit; the second quantitative unit is communicated with the standard gas cylinder to obtain standard gas, and the pushing unit pushes the standard gas in the second quantitative unit to the gas separation unit.
Description
Technical Field
The invention relates to the technical field of online monitoring equipment, in particular to a device for checking the online monitoring accuracy of dissolved gas in oil.
Background
The transformer and the reactor are the most important electrical equipment of the transformer substation, and the super-high voltage transformer and the extra-high voltage transformer are mostly of oilpaper insulation structures. By virtue of the advantage that the dissolved gas in the oil can directly and accurately determine the state of the equipment, the method becomes the most direct and effective means for monitoring the health condition of the oil-filled electrical equipment. The oil chromatography on-line monitoring device of the transformer and the reactor becomes an important means for monitoring the insulation state of the ultra-high voltage oil filling equipment by virtue of high test efficiency, high automation degree and small maintenance workload.
The device is influenced by the severe natural environment and the operation life of the transformer substation, and the testing accuracy of the device can be influenced after the chromatographic column in the oil chromatography on-line monitoring device is aged and damaged. In order to accurately evaluate the health status of the chromatographic column and the accuracy level of the oil chromatography on-line monitoring device, a standard oil comparison mode is required to be adopted regularly to evaluate the health status of the chromatographic column and the accuracy level of the oil chromatography on-line monitoring device.
The following pain points exist in the standard oil comparison:
1. there is a risk of the oil of the transformer being contaminated by the standard oil.
And after the test is finished, recovering the pipeline of the oil outlet of the transformer to the transformer body, and executing the oil circulation program for five times to ensure that the residual oil in the oil tank is the insulating oil in the transformer. And recovering the pipeline of the oil return port of the transformer to the transformer body. If the test is not thoroughly resumed after flushing, the residual standard oil in the oil tank can enter the transformer to pollute the transformer oil.
2. The efficiency is low.
Two hours are needed for one concentration standard oil comparison of one transformer oil online monitoring device, and four hours are needed for each standard oil test of high concentration oil and low concentration oil according to technical requirements.
3. The standard insulating oil and transformer insulating oil are needed to be used for cleaning the oil tank before and after oil marking, so that a large amount of insulating oil is wasted.
Before testing standard oil, the oil storage tank of the on-line monitoring device for dissolved gas in the transformer oil needs to be flushed with the standard oil for five times to prevent the residual transformer oil in the oil storage tank from affecting the testing accuracy and the transformer oil transformer from being polluted by the standard oil. About 0.25L of insulating oil is needed for each flushing, the test needs to be flushed once, 0.25 x 5 = 1.25L of insulating oil is needed for each concentration standard oil test, and 1.25 x 2 = 2.5L of insulating oil is needed to be consumed for each standard oil test of high concentration and low concentration according to technical requirements.
The application publication number is CN116858635A, and the name is a standard oil sample configuration device for online monitoring and checking of dissolved gas in transformer oil. The device comprises an oil bag tank and an oil bag arranged in the oil bag tank, wherein the oil bag is connected with a first oil gas inlet and a second oil gas inlet and outlet, a degassing circulation loop is connected between the first oil gas inlet and outlet and the second oil gas inlet and outlet, a vacuum degassing tank is arranged on the degassing circulation loop, and a heater is arranged on the vacuum degassing tank and is connected with a vacuumizing assembly. Therefore, the risk of pollution of the transformer oil by the standard oil exists, the verification efficiency is low, and the insulating oil is wasted.
The application publication number is CN116553021A, and the name is a standard oil sample storage device for checking the on-line monitoring equipment of the dissolved gas in the transformer oil. The oil bag tank is provided with a temperature control component and a pressure control component. Therefore, the risk of pollution of the transformer oil by the standard oil exists, the verification efficiency is low, and the insulating oil is wasted.
Disclosure of Invention
The invention provides a device for checking the accuracy of online monitoring of dissolved gas in oil, which solves the technical problems of oil pollution of standard oil, low checking efficiency and insulation oil waste.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the device for checking the accuracy of on-line monitoring of dissolved gas in oil comprises an oil-gas separation unit, a gas detection unit and a measurement and control unit which are sequentially connected, wherein the oil-gas separation unit comprises a sampling unit, a first quantitative unit and a pushing unit, the sampling unit is connected with the first quantitative unit, the pushing unit is connected with the gas separation unit through the first quantitative unit, the device further comprises a checking unit, the checking unit comprises a gas marking cylinder and a second quantitative unit, the gas marking cylinder is connected with the second quantitative unit, and the pushing unit is connected with the gas separation unit through the second quantitative unit.
The further technical proposal is that: during detection, the sampling unit is used for communicating equipment to be detected to obtain an oil sample, separating to obtain sample gas and conveying the sample gas to the first quantitative unit, the pushing unit is used for conveying the sample gas in the first quantitative unit to the gas separation unit, the gas separation unit is used for separating the sample gas, obtaining each gas in the sample gas and conveying each gas to the gas detection unit, and the gas detection unit is used for detecting the gas, obtaining a sample gas detection result and conveying the sample gas detection result to the detection control unit; during verification, the second quantitative unit is used for communicating the standard gas cylinder to obtain standard gas, the pushing unit is used for conveying the standard gas in the second quantitative unit to the gas separation unit, the gas separation unit is used for separating the standard gas, obtaining each gas in the standard gas and conveying each gas to the gas detection unit, and the gas detection unit is used for detecting the gas, obtaining a standard gas detection result and sending the standard gas detection result to the detection control unit; the measurement and control unit is used for obtaining a sample gas detection result and a standard gas detection result, comparing and obtaining a comparison result.
The further technical proposal is that: the second quantitative unit comprises a tenth valve, an eleventh valve, a first connecting pipe, a second connecting pipe and a second quantitative pipe, and the pushing unit comprises a seventh valve, an eighth valve, a ninth valve, a twelfth valve, a fourteenth valve, a third connecting pipe, a fourth connecting pipe and a gas carrying cylinder; the gas carrying cylinder is communicated with the gas separation unit through a fourth connecting pipe, the seventh valve, the twelfth valve and the fourteenth valve are fixedly connected to the fourth connecting pipe, and the gas carrying cylinder, the seventh valve, the twelfth valve, the fourteenth valve and the gas separation unit are sequentially distributed; one end of the first connecting pipe is communicated with the standard gas cylinder, the other end of the first connecting pipe is communicated with a fourth connecting pipe between the seventh valve and the twelfth valve, the eighth valve and the eleventh valve are fixedly connected to the first connecting pipe, the standard gas cylinder, the eighth valve and the eleventh valve are sequentially distributed, one end of the second quantitative pipe is communicated with the first connecting pipe between the eighth valve and the eleventh valve, the other end of the second quantitative pipe is communicated with a fourth connecting pipe between the twelfth valve and the fourteenth valve through a third connecting pipe, the ninth valve is fixedly connected to the third connecting pipe on one side of the second quantitative pipe, and the second quantitative pipe is communicated with the outside through the second connecting pipe and the tenth valve.
The further technical proposal is that: the first metering unit comprises a third valve, a fourth valve, a fifth valve, a sixth valve, a fifth connecting pipe, a sixth connecting pipe, a seventh connecting pipe and a first metering pipe, one end of the first metering pipe is communicated with the fourth connecting pipe between the twelfth valve and the fourteenth valve through the sixth connecting pipe, the sixth valve is fixedly connected to the sixth connecting pipe on one side of the first metering pipe, the other end of the first metering pipe is communicated with the seventh connecting pipe, the third valve is fixedly connected to the seventh connecting pipe on one side of the first metering pipe, the seventh connecting pipe is used for being communicated with the sampling unit, the first metering pipe is communicated with the outside through the fourth valve, one end of the fifth connecting pipe is communicated with the fourth connecting pipe between the fourteenth valve and the gas separation unit, the other end of the fifth connecting pipe is communicated with the seventh connecting pipe between the first metering pipe and the third valve, and the fifth valve is fixedly connected to the fifth connecting pipe on one side of the first metering pipe.
The further technical proposal is that: the sampling unit comprises a first valve, a second valve, an eighth connecting pipe, a ninth connecting pipe, a tenth connecting pipe, a vacuum pump, an air pump, an oil pump, a lower liquid level sensor, an upper liquid level sensor, a pressure gauge and an oil tank, wherein the oil tank is communicated with the ninth connecting pipe, the second valve is fixedly connected to the ninth connecting pipe, and the ninth connecting pipe is used for communicating equipment to be tested to obtain an oil sample; the oil tank is communicated with a tenth connecting pipe, the first valve is fixedly connected to the tenth connecting pipe, the tenth connecting pipe is used for communicating oil return of equipment to be tested, and the oil pump is fixedly connected to the tenth connecting pipe at one side of the oil tank; the lower liquid level sensor and the upper liquid level sensor are both fixed inside the oil tank, the lower liquid level sensor is located the lower part of the oil tank, the upper liquid level sensor is located the middle part of the oil tank, the pressure gauge is fixedly connected to the top of the oil tank, the first quantitative unit is communicated with the upper part of the oil tank through the vacuum pump, one end of the eighth connecting pipe is communicated with the upper part of the oil tank, the eighth connecting pipe penetrates into the inside of the oil tank through the top of the oil tank, the other end of the eighth connecting pipe extends into the lower part in the oil tank, and the air pump is fixedly connected to the eighth connecting pipe outside the oil tank.
The further technical proposal is that: the gas detection unit comprises a tenth valve, a detector and a communication unit, one end of the detector is communicated with the gas separation unit, the other end of the detector is communicated with the outside through the tenth valve, the detector is electrically connected with the communication unit, and the communication unit is electrically connected with the measurement and control unit; the gas separation unit comprises a gas chromatographic column and a pipeline, the gas chromatographic column is communicated with the second quantitative unit through the pipeline, and the gas chromatographic column is communicated with the gas detection unit through the pipeline.
The further technical proposal is that: the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the twelfth valve and the fourteenth valve are all electric control valves, and the control end of the measurement and control unit is respectively and independently electrically connected with the control end of each electric control valve.
The further technical proposal is that: the third valve, the fourth valve, the fifth valve and the sixth valve are all electric control valves, and the control end of the measurement and control unit is respectively and independently electrically connected with the control end of each electric control valve.
The further technical proposal is that: the first valve and the second valve are all electric control valves, the control end of the measurement and control unit is respectively and independently electrically connected with the control end of each electric control valve, and the measurement and control unit is respectively and independently electrically connected with the vacuum pump, the air pump, the oil pump, the lower liquid level sensor, the upper liquid level sensor and the pressure gauge.
The further technical proposal is that: the tenth valve is an electric control valve, and the control end of the measurement and control unit is electrically connected with the control end of the thirteenth valve.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
the device for checking the accuracy of on-line monitoring of dissolved gas in oil comprises an oil-gas separation unit, a gas detection unit and a measurement and control unit which are sequentially connected, wherein the oil-gas separation unit comprises a sampling unit, a first quantitative unit and a pushing unit, the sampling unit is connected with the first quantitative unit, the pushing unit is connected with the gas separation unit through the first quantitative unit, the device further comprises a checking unit, the checking unit comprises a gas marking cylinder and a second quantitative unit, the gas marking cylinder is connected with the second quantitative unit, and the pushing unit is connected with the gas separation unit through the second quantitative unit. According to the technical scheme, the second quantitative unit is communicated with the standard gas cylinder to obtain standard gas, the pushing unit pushes the standard gas in the second quantitative unit to the gas separation unit, and the standard gas is directly sent to the gas separation unit through the second quantitative unit, so that the risk of polluting transformer oil does not exist at all, the verification efficiency is improved, and insulating oil is not wasted.
See the description of the detailed description section.
Drawings
FIG. 1 is a block diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic block diagram of embodiment 1 of the present invention;
FIG. 3 is a block diagram of a prior art oil chromatography on-line monitoring device;
fig. 4 is a diagram showing the structure of the conventional oil marking.
Wherein: 1 first valve, 2 second valve, 3 third valve, 4 fourth valve, 5 fifth valve, 6 sixth valve, 7 seventh valve, 8 eighth valve, 9 ninth valve, 10 tenth valve, 11 eleventh valve, 12 twelfth valve, 13 tenth third valve, 14 fourteenth valve, 21 first connecting pipe, 22 second connecting pipe, 23 third connecting pipe, 24 fourth connecting pipe, 25 fifth connecting pipe, 26 sixth connecting pipe, 27 seventh connecting pipe, 28 eighth connecting pipe, 29 ninth connecting pipe, 30 tenth connecting pipe, 31 first metering pipe, 32 second metering pipe, 33 gas carrying cylinder, 34 standard gas cylinder, 35 vacuum pump, 36 gas pump, 37 oil pump, 38 lower liquid level sensor, 39 upper liquid level sensor, 40 manometer, 41 oil tank, 42 transformer, 43 gas chromatographic column, 44 detector, 45 communication unit, 46 measurement and control unit, 50 existing oil-gas separation unit, 51 separation unit, 52 gas separation unit, 53 gas detection unit, 54 standard oil tank, 55 waste oil tank.
Detailed Description
The existing oil chromatography on-line monitoring device and the standard oil comparison are described as follows.
1. Oil chromatograph on-line monitoring device
As shown in fig. 3, the existing oil chromatography on-line monitoring device comprises an existing oil-gas separation unit 50, a gas separation unit 52, a gas detection unit 53 and a measurement and control unit 46, wherein the existing oil-gas separation unit 50 is used for communicating with the transformer 42, the measurement and control unit 46 is connected with the gas detection unit 53, and the measurement and control unit 46 is connected with the existing oil-gas separation unit 50. The transformer 42 is the device under test.
The first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7, the fourth connecting pipe 24, the fifth connecting pipe 25, the sixth connecting pipe 26, the seventh connecting pipe 27, the eighth connecting pipe 28, the ninth connecting pipe 29, the tenth connecting pipe 30, the first metering pipe 31, the carrier gas bottle 33, the vacuum pump 35, the air pump 36, the oil pump 37, the lower liquid level sensor 38, the upper liquid level sensor 39, the pressure gauge 40, and the oil tank 41 form the existing oil-gas separation unit 50.
The working flow of the test of the existing oil chromatography on-line monitoring device is as follows:
oil circulation, oil sample sampling, oil-gas separation, gas detection, oil discharge after sampling is finished, and data processing.
1) The oil circulation is to clean the oil pipe.
As shown in fig. 3, the measurement and control unit 46 controls and closes the oil inlet valve, namely the first valve 1, and the oil outlet valve, namely the second valve 2, of the transformer 42, the measurement and control unit 46 controls the vacuum pump 35 to start, and vacuum is pumped into the oil tank 41 until the pressure gauge 40 obtains that the pressure is 5kPa; the pressure gauge 40 informs the measurement and control unit 46, the measurement and control unit 46 controls the second valve 2 to be opened, and oil of the transformer 42 enters the oil tank 41 under the action of oil pressure of the transformer 42 and negative pressure in the oil tank 41. The oil is fed to an upper liquid level action point, namely an upper liquid level sensor 39, the upper liquid level sensor 39 informs a measurement and control unit 46, and the measurement and control unit 46 controls the second valve 2 to be closed, so that the oil feeding is finished.
The measurement and control unit 46 controls the first valve 1 and the second valve 2 to be opened, the air is broken briefly, and then the first valve 1 and the second valve 2 are closed; opening the first valve 1, and starting the oil pump 37 to discharge oil; the oil is discharged to a lower liquid level action point, namely a lower liquid level sensor 38, the oil pump 37 is closed, the first valve 1 is closed, and the oil discharge is finished. About 250mL of insulating oil needs to be circulated for each oil cycle.
2) Sampling an oil sample.
The measurement and control unit 46 controls the first valve 1 and the second valve 2 to be closed, controls the vacuum pump 35 to be started, and pumps vacuum in the oil tank 41 until the pressure gauge 40 obtains that the pressure is 5kPa; the pressure gauge 40 informs the measurement and control unit 46, the measurement and control unit 46 controls the second valve 2 to be opened, and oil of the transformer 42 enters the oil tank 41 under the action of oil pressure of the transformer 42 and negative pressure in the oil tank 41. The oil is fed to an upper liquid level action point, namely an upper liquid level sensor 39, the upper liquid level sensor 39 informs a measurement and control unit 46, and the measurement and control unit 46 controls the second valve 2 to be closed, so that the oil feeding is stopped. About 250mL of insulating oil was extracted from the transformer 42 for each test.
3) And (3) oil-gas separation.
The measurement and control unit 46 controls the vacuum pump 35 to keep working, when the pressure gauge 40 knows that the gas pressure is kept at 5kPa, the measurement and control unit 46 informs the measurement and control unit 46 that the vacuum pump 35 is closed, the air pump 36 is opened for blowing and stirring, the vacuum degassing is carried out by combining the vacuum negative pressure of the oil tank 41, and the oil-gas separation is finished after 30 minutes.
As shown in Table 1, the gas pressure was P 1 Since the volume of the oil tank 41 was 500mL,250mL was insulating oil and the partial volume of the gas was 250mL.
The measurement and control unit 46 controls the third valve 3, the fourth valve 4 and the vacuum pump 35 to be opened for pumping and transferring the sample gas, and temporarily stores the sample gas in the 5mL first quantitative pipe 31, wherein the pressure in the quantitative pipe is atmospheric pressure, and according to PV=C, P is the pressure, V is the volume, and C is constant, so that the gas in the 5mL quantitative pipe under the atmospheric pressure is converted into P 1 Volume under pressure of 5ml 0 /P 1 ，P 0 Atmospheric pressure, C is constant and occupies P 1 The proportion of the total volume of 250mL under pressure is (5 mL. Times.P 0 /P 1 )/250mL。
Table 1: data sheet of on-line monitoring device for dissolved gas in transformer oil
4) And (5) separating gas.
The measurement and control unit 46 controls the third valve 3, the fourth valve 4 and the fourteenth valve 14 to be closed, and opens the seventh valve 7, the sixth valve 6 and the fifth valve 5, so that the carrier gas in the carrier gas bottle 33 is introduced into the first metering tube 31, the metering tube has the function of storing a fixed amount of gas, 5mL of gas is stored, and the carrier gas pushes 5mL of sample gas into the subsequent gas chromatographic column 43 for gas separation.
5) And (5) detecting gas.
After gas separation is performed by the gas separation unit 52, the gas separation unit 52 comprises a gas chromatographic column 43 and a pipeline correspondingly connected with the gas chromatographic column, and characteristic gases of all components sequentially enter the detector 44 for detection one by one; the gas separation and the gas detection are performed simultaneously.
The whole system is operated at constant temperature, and the total volume of each component is calculated to H 2 For example, detector 44 detects H in a 5mL metering tube 2 The total volume was y. Mu.L. When the temperature is unchanged, the product of the pressure and the volume of a certain mass of gas is constant. Then P 0 Conversion of 5mL of gas to P in a quantitative tube under atmospheric pressure 1 The volume under the pressure is V1, then V1 is P 1 ＝5mL*P 0 L is constant, so v1=5ml p 0 /P 1 This part of the volume occupies P 1 250mL of air under air pressureThe ratio of body volumes is k=v1/250 ml= (5 mL p) 0 /P 1 ) /250mL. 250mL of H in insulating oil 2 Is y mu L/k, usually P 1 About 10kPa, so that a test assumes P 1 =10kpa, at H 2 For example, the detector detects H in 5mL of gas in a quantitative tube 2 The total volume was 3.2. Mu.L, 250mL of H in insulating oil 2 The total content was 3.2 μl/k=3.2 μl/((5 ml p) 0 /P 1 ) Per 250 mL))=3.2 μl/((5 mL x 101 kpa)/(10 kpa x 250 mL))=15.84 μl, at which time H in the oil 2 The content was 15.84. Mu.L/250 mL=63.36. Mu.L/L. I.e. when the detector detects H in a 5mL metering tube 2 The test result was 63.36. Mu.L/L when the total volume was 3.2. Mu.L, and the same ratio was calculated when the detector detected H in a 5mL metering tube 2 The test result is (a/3.2) 63.63 mu L/L when the total volume is a mu L, and other gas analysis methods are the same, so that the standard gas concentration selection can be provided.
For example, when detector 44 detects H in a 5mL metering tube 2 The test results were (6/3.2) 63.63 μl/l=119.3 μl/L for a total volume of 6 μl.
6) And discharging oil after the sampling is finished.
The measurement and control unit 46 controls the first valve 1 and the second valve 2 to be opened, the air is broken briefly, and then the first valve 1 and the second valve 2 are closed; opening the first valve 1, and starting the oil pump 37 to discharge oil; the oil is discharged to the lower liquid level operation point, the oil pump 37 is closed, the first valve 1 is closed, and the oil discharge is completed.
7) And (5) data processing.
2. Oil standard comparison
As shown in fig. 4, in the conventional standard oil alignment, it is necessary to remove a pipe connecting the oil outlet of the transformer 42, connect the pipe to the standard oil storage tank, i.e., the standard oil tank 54, remove a pipe connecting the oil return port of the transformer, and connect the pipe to the waste oil tank 55. And starting an oil chromatograph on-line monitoring device to test the content of each dissolved gas in the oil marking tank.
The standard oil is prepared in advance in the standard oil tank 54, a part of the standard oil is taken out, and the CH in the standard oil is tested by using an off-line oil dissolved gas tester 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 、CO、CO 2 And H 2 Is assumed to be the first content. And then taking a part of the standard oil, and testing CH in the standard oil by using an oil chromatography on-line monitoring device 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 、CO、CO 2 And H 2 Is assumed to be the second content. The data tested by the offline dissolved gas tester in oil is very accurate, so that the first content is an accurate value, the difference value of the second content minus the first content is divided by the first content, the measurement error of the online monitoring device of the oil chromatograph can be obtained, and the health state of the chromatographic column and the accuracy grade of the online monitoring device of the oil chromatograph are evaluated according to the online monitoring device accuracy grade judgment table of the dissolved gas in the transformer oil in the technical specification QGDW10536-2021 of the online monitoring device of the dissolved gas in the transformer oil. By H 2 For purposes of illustration, H in the first content tested 2 The content of (C) was 205.3. Mu.L/L. 205.3 mu L/L is located in a detection range of 20 mu L/L-2000 mu L/L, so that an accuracy grade judgment table of the on-line monitoring device for the dissolved gas in the transformer oil in the technical specification QGDW 10536-2021 of the on-line monitoring device for the dissolved gas in the transformer oil is used for evaluating the health state of a chromatographic column and the accuracy grade of the on-line monitoring device for the oil chromatograph. Tested H in the second content 2 The content of (C) was 280.3. Mu.L/L. The measurement error of the oil chromatography on-line monitoring device is (280.3-205.3)/205.3=36.5%. The measurement error exceeds +/-35 percent but is less than +/-40 percent, and the accuracy grade of the oil chromatography on-line monitoring device is judged to be C grade according to an accuracy grade judgment table of the on-line monitoring device for the dissolved gas in the transformer oil.
As shown in fig. 3, the test is completed, the pipeline of the oil outlet of the transformer is restored to the transformer body, and then the oil tank cleaning procedure is executed for five times, so that the residual oil in the oil tank is ensured to be the insulating oil in the transformer. And recovering the pipeline of the oil return port of the transformer to the transformer body.
If the test is not thoroughly resumed after flushing, the residual standard oil in the oil tank can enter the transformer to pollute the transformer oil. The transformer oil is just like the blood of the transformer, the characteristic gas content of the transformer reflects the running state of the transformer, the characteristic gas contained in the standard oil is different from that in the transformer, the standard oil flows into the transformer to change the characteristic gas content in the transformer, and the running state of the transformer cannot be judged according to the characteristic gas content.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Example 1:
as shown in fig. 1 and 2, the present invention discloses a device for checking the accuracy of on-line monitoring of dissolved gas in oil, which comprises a first valve 1 to a fourteenth valve 14, a first connecting pipe 21 to a tenth connecting pipe 30, a first metering pipe 31, a second metering pipe 32, a gas-carrying cylinder 33, a gas-marking cylinder 34, a vacuum pump 35, a gas pump 36, a gas pump 37, a lower liquid level sensor 38, an upper liquid level sensor 39, a pressure gauge 40, a tank 41, a transformer 42, a gas chromatographic column 43, a detector 44, a communication unit 45 and a measurement and control unit 46, wherein the pressure gauge 40 is fixedly connected to the top of the tank 41.
As shown in fig. 1, the transformer 42 is connected and conducted with the oil tank 41 through the ninth connecting pipe 29 to form a transformer oil return pipeline, the transformer 42 is connected and conducted with the oil tank 41 through the tenth connecting pipe 30 to form a transformer oil outlet pipeline, the second valve 2 is fixedly connected to the ninth connecting pipe 29 on one side of the transformer 42, the first valve 1 is fixedly connected to the tenth connecting pipe 30 on one side of the transformer 42, and the oil pump 37 is fixedly connected to the tenth connecting pipe 30 on one side of the oil tank 41.
As shown in fig. 1, the lower liquid level sensor 38 and the upper liquid level sensor 39 are fixedly connected to the inside of the oil tank 41, the lower liquid level sensor 38 is located at the lower part of the oil tank 41, and the upper liquid level sensor 39 is located at the middle part of the oil tank 41.
As shown in fig. 1, one end of the eighth connection pipe 28 is connected to the upper portion of the oil tank 41, the eighth connection pipe 28 penetrates into the oil tank 41 through the top of the oil tank 41, the other end of the eighth connection pipe 28 reaches the lower portion of the oil tank 41, and the air pump 36 is fixedly connected to the eighth connection pipe 28 outside the oil tank 41.
As shown in fig. 1, one end of the seventh connection pipe 27 is connected to and communicated with the upper portion of the oil tank 41, the other end of the seventh connection pipe 27 is connected to and communicated with the first metering pipe 31, and the vacuum pump 35 is fixedly connected to the seventh connection pipe 27 outside the oil tank 41.
As shown in fig. 1, one end of the fourth connecting tube 24 is connected to the gas-carrying bottle 33, the other end of the fourth connecting tube 24 is connected to the gas chromatographic column 43, one end of the first connecting tube 21 is connected to the target gas bottle 34, the other end of the first connecting tube 21 is connected to the fourth connecting tube 24, one end of the second metering tube 32 is connected to the first connecting tube 21, the other end of the second metering tube 32 is connected to the second connecting tube 22, one end of the third connecting tube 23 is connected to the second connecting tube 22, the other end of the third connecting tube 23 is connected to the fourth connecting tube 24, one end of the sixth connecting tube 26 is connected to the first metering tube 31, the other end of the sixth connecting tube 26 is connected to the fourth connecting tube 24, one end of the fifth connecting tube 25 is connected to the seventh connecting tube 27, and the other end of the fifth connecting tube 25 is connected to the fourth connecting tube 24.
As shown in fig. 1, the seventh valve 7 is fixedly connected to the fourth connection pipe 24 between the carrier gas bottle 33 and the first connection pipe 21, the twelfth valve 12 is fixedly connected to the fourth connection pipe 24 between the first connection pipe 21 and the third connection pipe 23, the eleventh valve 11 is fixedly connected to the first connection pipe 21 on one side of the gas bottle 34, the eighth valve 8 is fixedly connected to the first connection pipe 21 between the second metering pipe 32 and the fourth connection pipe 24, the ninth valve 9 is fixedly connected to the third connection pipe 23 between the second metering pipe 22 and the fourth connection pipe 24, the tenth valve 10 is fixedly connected to the second connection pipe 22 distant from the second metering pipe 32 and the third connection pipe 23, the second metering pipe 32 is connected to or disconnected from the outside through the second connection pipe 22 and the tenth valve 10, and the fourteenth valve 14 is fixedly connected to the fourth connection pipe 24 between the fifth connection pipe 25 and the sixth connection pipe 26.
As shown in fig. 1, the sixth valve 6 is fixedly connected to the sixth connection pipe 26 at one side of the first metering pipe 31, the fourth valve 4 is fixedly connected to the sixth connection pipe 26 between the sixth valve 6 and the first metering pipe 31, and the first metering pipe 31 is connected to or disconnected from the outside through the sixth connection pipe 26 and the fourth valve 4.
As shown in fig. 1, the third valve 3 is fixedly connected to the seventh connection pipe 27 between the fifth connection pipe 25 and the vacuum pump 35, and the fifth valve 5 is fixedly connected to the fifth connection pipe 25.
As shown in fig. 1, the gas chromatography column 43 is connected to the detector 44, the detector 44 is connected to the thirteenth valve 13, and the detector 44 is connected to the outside through the tenth valve 13 or is turned off.
As shown in fig. 2, the measurement and control unit 46 is electrically connected and communicated with the communication unit 45, the detector 44 is electrically connected and communicated with the communication unit 45, the lower liquid level sensor 38 is electrically connected with the measurement and control unit 46, the upper liquid level sensor 39 is electrically connected with the measurement and control unit 46, the pressure gauge 40 is electrically connected with the measurement and control unit 46, the control end of the measurement and control unit 46 is electrically connected with the control end of the vacuum pump 35, the control end of the measurement and control unit 46 is electrically connected with the control end of the air pump 36, and the control end of the measurement and control unit 46 is electrically connected with the control end of the oil pump 37.
The first valve 1 to the fourteenth valve 14 are all electric control valves, the first valve 1 is a first electric control valve, the second valve 2 is a second electric control valve, the third valve 3 is a third electric control valve, the fourth valve 4 is a fourth electric control valve, the fifth valve 5 is a fifth electric control valve, the sixth valve 6 is a sixth electric control valve, the seventh valve 7 is a seventh electric control valve, the eighth valve 8 is an eighth electric control valve, the ninth valve 9 is a ninth electric control valve, the tenth valve 10 is a tenth electric control valve, the eleventh valve 11 is an eleventh electric control valve, the twelfth valve 12 is a twelfth electric control valve, the thirteenth valve 13 is a thirteenth electric control valve, and the fourteenth valve 14 is a fourteenth electric control valve.
As shown in fig. 2, the control end of the measurement and control unit 46 is electrically connected to the control end of the first electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the second electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the fourth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the fifth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the sixth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the eighth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the ninth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the tenth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the twelfth electric control valve, the control end of the measurement and control unit 46 is electrically connected to the control end of the thirteenth electric control valve.
The first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7, the eighth valve 8, the ninth valve 9, the tenth valve 10, the eleventh valve 11, the twelfth valve 12, the fourteenth valve 14, the first connecting pipe 21, the second connecting pipe 22, the third connecting pipe 23, the fourth connecting pipe 24, the fifth connecting pipe 25, the sixth connecting pipe 26, the seventh connecting pipe 27, the eighth connecting pipe 28, the ninth connecting pipe 29, the tenth connecting pipe 30, the first metering pipe 31, the second metering pipe 32, the gas cylinder 33, the gas cylinder 34, the vacuum pump 35, the gas pump 36, the oil pump 37, the lower level sensor 38, the upper level sensor 39, the pressure gauge 40, and the oil tank 41 form the oil-gas separation unit 51.
The vacuum pump, the air pump, the oil pump, the liquid level sensor, the pressure gauge, the detector, the communication unit, the measurement and control unit and the electric control valve are in the prior art, and the corresponding communication connection technology is not repeated here.
The gas separation unit 52 includes a gas chromatographic column 43 and corresponding connected piping, and is not described in detail herein for the prior art.
The detector 44, the thirteenth valve 13 and the communication unit 45 form a gas detection unit 53, which is not described in detail herein for the prior art.
The first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7, the fourteenth valve 14, the fourth connecting pipe 24, the fifth connecting pipe 25, the sixth connecting pipe 26, the seventh connecting pipe 27, the eighth connecting pipe 28, the ninth connecting pipe 29, the tenth connecting pipe 30, the first metering pipe 31, the carrier gas bottle 33, the vacuum pump 35, the air pump 36, the oil pump 37, the lower liquid level sensor 38, the upper liquid level sensor 39, the pressure gauge 40 and the oil tank 41 form an original oil-gas separation unit, and are not repeated herein for the prior art.
Compared with the original oil-gas separation unit, a check unit is additionally arranged, and the check unit is formed by an eighth valve 8, a ninth valve 9, a tenth valve 10, an eleventh valve 11, a twelfth valve 12, a first connecting pipe 21, a second connecting pipe 22, a third connecting pipe 23, a second metering pipe 32 and a standard gas cylinder 34.
The checking unit is connected and communicated with the original oil-gas separation unit and is used for acquiring sample gas from the original oil-gas separation unit, pushing the sample gas to the gas separation unit 52 by the checking unit, and detecting by the gas detection unit 53 to acquire a detection result of dissolved gas in oil. The gas separation unit 52 and the gas detection unit 53 are prior art and will not be described here.
The first valve 1, the second valve 2, the eighth connecting pipe 28, the ninth connecting pipe 29, the tenth connecting pipe 30, the vacuum pump 35, the air pump 36, the oil pump 37, the lower level sensor 38, the upper level sensor 39, the pressure gauge 40, and the oil tank 41 form a sampling unit.
The third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the fifth connecting tube 25, the sixth connecting tube 26, the seventh connecting tube 27 and the first metering tube 31 form a first metering unit, and the tenth valve 10, the eleventh valve 11, the first connecting tube 21, the second connecting tube 22 and the second metering tube 32 form a second metering unit.
The seventh valve 7, the eighth valve 8, the ninth valve 9, the twelfth valve 12, the fourteenth valve 14, the third connecting pipe 23, the fourth connecting pipe 24 and the gas carrier bottle 33 form a pushing unit.
Description of example 1 use:
as shown in fig. 1, the newly added verification unit and the original on-line monitoring device for the dissolved gas in the transformer oil form a device for verifying the on-line monitoring accuracy of the dissolved gas in the oil, and the newly added verification unit comprises an eighth valve 8, a ninth valve 9, a tenth valve 10, an eleventh valve 11, a twelfth valve 12, a first connecting pipe 21, a second connecting pipe 22, a third connecting pipe 23, a second metering pipe 32 and a standard gas bottle 34, and the other parts are in the prior art.
The standard gas of the standard gas bottle 34 contains a fixed content of CH 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 、CO、CO 2 And H 2 The on-line monitoring device includes an oil-gas separation unit 51, a gas separation unit 52, a gas detection unit 53 and a measurement and control unit 46, which are not described in detail herein for the prior art.
The test flow is as follows: gas path cleaning, gas marking temporary storage and instrument marking, and three processes are adopted.
1. Gas path cleaning
The measurement and control unit 46 controls the seventh valve 7, the eighth valve 8 and the tenth valve 10 to be opened, and the other valves to be closed all together, so that the carrier gas in the carrier gas bottle 33 flows out of the instrument to the outside through the seventh valve 7, the eighth valve 8, the second metering tube 32 and the tenth valve 10, and is kept for a period of time, for example, two minutes, and the second metering tube 32 is filled with the carrier gas for the next step.
2. Temporary storage of standard gas
The measurement and control unit 46 controls the eleventh valve 11 and the tenth valve 10 to be opened, the other valves are closed, the standard gas in the standard gas bottle 34 flows out of the instrument along the eleventh valve 11, the second metering tube 32 and the tenth valve 10, and the standard gas is kept for a period of time, for example, two minutes, and the second metering tube 32 is filled with the standard gas for the next step.
3. Instrument calibration
The measurement and control unit 46 controls the seventh valve 7, the eighth valve 8, the ninth valve 9 and the thirteenth valve 13 to be opened, other valves are closed, and the carrier gas in the carrier gas bottle 33 flows through the seventh valve 7, the eighth valve 8 and the standard gas in the second metering tube 32, flows out of the instrument through the ninth valve 9, the gas chromatographic column 43, the detector 44 and the thirteenth valve 13 to finish detection.
In the field test process, the CH is required to be compared by an on-line monitoring device for the dissolved gas in the oil 4 、C 2 H 6 、C 2 H 4 、C 2 H 2 、CO、CO 2 And H 2 Is provided.
According to the technical specification of an on-line monitoring device for the dissolved gas in the Q/GDW 10536-2021 transformer oil, the contents of different concentrations are required to be detected, and H is used here 2 For illustration, other gas detection methods and detection of H 2 The same method as in (a).
As shown in Table 2, the specifications require H at levels of 5-20. Mu.L/L and 20-2000. Mu.L/L 2 And (3) detecting, wherein an instrument accuracy judgment standard is required.
Table 2: accurate grade judgment table of on-line monitoring device for dissolved gas in transformer oil
According to 6) gas detection, the test result at 3.2. Mu.L was 63.36. Mu.L/L, and the calculation result was H in the quantitative tube 2 0.25-1 mu L, accurate detection result is 5-20 mu L/L, and H is measured in a quantitative pipe 2 1-101 mu L, and the accurate detection result is 20-2000 mu L/L.
The upper and lower average values of the ranges are thus taken as comparison standard values, i.e. the calibration concentrations are (5+20)/2=12.5 μl/L and (2000+20)/2=1010 μl/L.
According to the method conversion in 6) gas detection, H is injected into the quantitative pipe 2 When the volume of the monitoring device is 0.63 μl, the test result of the monitoring device is (0.63 μl/3.2 μl) 63.36=12.5 μl/L. Injection of H into metering tubes 2 The test results of the monitoring device were (51 μl/3.2 μl) at a volume of 51 μl x 63.36=1010 μl/L.
The combined quantitative tube volume was 5mL, so that when the standard gas concentrations were taken to be 0.63 μl/5 ml=126 μl/L and 51 μl/5 ml=10200 μl/L, the accurate results of the test were 12.5 μl/L and (2000+20)/2=1010 μl/L.
As shown in Table 3, the measured results were compared with 12.5. Mu.L/L and 1010. Mu.L/L, respectively, to calculate deviations. On-line monitoring device for testing H in standard gas with two concentrations by using dissolved gas in oil 2 Calculating measurement errors, and requiring judgment of the accuracy level of the on-line monitoring device for the dissolved gas in the oil.
For example, test was performed using a standard gas of 126. Mu.L/L H2, dissolved gas in transformer oil test H 2 The content of (2) is 13.1 mu L/L, the test concentration is (13.1-12.5)/12.2=4.8% of measurement error; with 10200. Mu.L/L H 2 Test is carried out on standard gas of transformer oil, and test H is carried out on dissolved gas in transformer oil 2 The content of (2) is 1210. Mu.L/L, the measurement concentration is (1210-1010)/1010=19.8%, and the device detects H 2 The precision of (2) is class a.
Table 3: standard oil alignment H 2 Concentration correspondence table
| Calibration concentration (mu L/L) | 12.5 | 1010 |
| Corresponding to the concentration of the standard gas (mu L/L) | 126 | 10200 |
| Error of | 4.8％ | 19.8％ |
| Accuracy grade | Class A | Class A |
The test procedure of the embodiment 1 after improvement is compared with the existing test procedure, the technical scheme of the application is that the air bottle 34 and the second quantitative unit are added, the air bottle 34 is connected with the second quantitative unit, the pushing unit is connected with the air separation unit 52 through the second quantitative unit, when the test is performed, the second quantitative unit is used for communicating the air bottle 34 to obtain the air bottle, the pushing unit is used for conveying the air bottle in the second quantitative unit to the air separation unit 52, an oil way between the transformer and the oil tank is not required to be opened, the test process is irrelevant to the oil way, and the following beneficial effects are achieved:
First, need not to open the oil circuit and do not have the oil circuit seal risk of inefficacy.
Second, the transformer oil is not polluted without using standard oil.
Thirdly, the link of degassing from oil is omitted, the efficiency is higher, the verification time of one concentration of the on-line monitoring device for the dissolved gas in oil is completed, the original two hours are reduced to one hour, and the efficiency is higher.
The method for verifying whether the chromatographic column in the oil chromatography on-line monitoring device is abnormal by changing the original preparation standard oil is directly used for verifying the state of the chromatographic column in the oil chromatography on-line monitoring device by standard gas, and links such as preparation standard oil and standard oil monitoring can be directly purchased in the standard gas market.
Example 2:
embodiment 2 differs from embodiment 1 in that a transformer is not included.
The invention discloses a device for checking the accuracy of online monitoring of dissolved gas in oil, which comprises a first valve 1 to a fourteenth valve 14, a first connecting pipe 21 to a tenth connecting pipe 30, a first metering pipe 31, a second metering pipe 32, a gas-carrying cylinder 33, a standard gas cylinder 34, a vacuum pump 35, a gas pump 36, a gas pump 37, a lower liquid level sensor 38, an upper liquid level sensor 39, a pressure gauge 40, an oil tank 41, a gas chromatographic column 43, a detector 44, a communication unit 45 and a measurement and control unit 46, wherein the pressure gauge 40 is fixedly connected to the top of the oil tank 41. The same points are not described in detail.
In the use of embodiment 2, the transformer 42 is connected to the oil tank 41 via the ninth connection pipe 29 to form a transformer oil return line, and the transformer 42 is connected to the oil tank 41 via the tenth connection pipe 30 to form a transformer oil outlet line.
Example 3:
embodiment 3 differs from embodiment 2 in that the first to fourteenth valves 1 to 14 are manual valves.
The invention discloses a device for checking the accuracy of online monitoring of dissolved gas in oil, which comprises a first valve 1 to a fourteenth valve 14, a first connecting pipe 21 to a tenth connecting pipe 30, a first metering pipe 31, a second metering pipe 32, a gas-carrying cylinder 33, a standard gas cylinder 34, a vacuum pump 35, a gas pump 36, a gas pump 37, a lower liquid level sensor 38, an upper liquid level sensor 39, a pressure gauge 40, an oil tank 41, a gas chromatographic column 43, a detector 44, a communication unit 45 and a measurement and control unit 46, wherein the pressure gauge 40 is fixedly connected to the top of the oil tank 41. The same points are not described in detail.
The first valve 1 to the fourteenth valve 14 are all manual valves, the manual mode is used for operation, detection and verification, and the manual control technology is not repeated in the prior art.
Claims (10)
1. The utility model provides a device for checking dissolved gas on-line monitoring degree of accuracy in oil, includes oil-gas separation unit, gas separation unit (52), gas detection unit (53) and measurement and control unit (46) that connect gradually, and oil-gas separation unit includes sampling unit, first quantitative unit and pushing unit, and sampling unit is connected with first quantitative unit, and pushing unit is connected with gas separation unit (52) through first quantitative unit, its characterized in that: the device further comprises a verification unit, the verification unit comprises a gas standard bottle (34) and a second quantitative unit, the gas standard bottle (34) is connected with the second quantitative unit, and the pushing unit is connected with the gas separation unit (52) through the second quantitative unit.
2. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 1, wherein: during detection, the sampling unit is used for communicating equipment to be detected to obtain an oil sample, separating to obtain sample gas and conveying the sample gas to the first quantitative unit, the pushing unit is used for conveying the sample gas in the first quantitative unit to the gas separation unit (52), the gas separation unit (52) is used for separating the sample gas, obtaining each gas in the sample gas and conveying each gas to the gas detection unit (53), and the gas detection unit (53) is used for detecting the gas, obtaining a sample gas detection result and sending the sample gas detection result to the detection control unit (46); during verification, the second quantitative unit is used for communicating the standard gas bottle (34) to obtain standard gas, the pushing unit is used for conveying the standard gas in the second quantitative unit to the gas separation unit (52), the gas separation unit (52) is used for separating the standard gas, obtaining each gas in the standard gas and conveying each gas to the gas detection unit (53), and the gas detection unit (53) is used for detecting the gas, obtaining a standard gas detection result and sending the standard gas detection result to the detection control unit (46); the measurement and control unit (46) is used for obtaining a sample gas detection result and a standard gas detection result, and comparing and obtaining a comparison result.
3. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 1, wherein: the second quantitative unit comprises a tenth valve (10), an eleventh valve (11), a first connecting pipe (21), a second connecting pipe (22) and a second quantitative pipe (32), and the pushing unit comprises a seventh valve (7), an eighth valve (8), a ninth valve (9), a twelfth valve (12), a fourteenth valve (14), a third connecting pipe (23), a fourth connecting pipe (24) and a carrier gas bottle (33); the gas carrying bottle (33) is communicated with the gas separation unit (52) through a fourth connecting pipe (24), the seventh valve (7), the twelfth valve (12) and the fourteenth valve (14) are fixedly connected to the fourth connecting pipe (24), and the gas carrying bottle (33), the seventh valve (7), the twelfth valve (12), the fourteenth valve (14) and the gas separation unit (52) are distributed in sequence; one end of the first connecting pipe (21) is communicated with a gas marking bottle (34), the other end of the first connecting pipe (21) is communicated with a fourth connecting pipe (24) between a seventh valve (7) and a twelfth valve (12), the eighth valve (8) and the eleventh valve (11) are fixedly connected to the first connecting pipe (21), the gas marking bottle (34), the eighth valve (8) and the eleventh valve (11) are distributed in sequence, one end of the second measuring pipe (32) is communicated with the first connecting pipe (21) between the eighth valve (8) and the eleventh valve (11), the other end of the second measuring pipe (32) is communicated with a fourth connecting pipe (24) between the twelfth valve (12) and the fourteenth valve (14) through a third connecting pipe (23), the ninth valve (9) is fixedly connected to the third connecting pipe (23) on one side of the second measuring pipe (32), and the second measuring pipe (32) is communicated with the outside through the second connecting pipe (22) and the tenth valve (10).
4. A device for checking the accuracy of on-line monitoring of dissolved gases in oil according to claim 3, characterized in that: the first metering unit comprises a third valve (3), a fourth valve (4), a fifth valve (5), a sixth valve (6), a fifth connecting pipe (25), a sixth connecting pipe (26), a seventh connecting pipe (27) and a first metering pipe (31), one end of the first metering pipe (31) is communicated with the fourth connecting pipe (24) between the twelfth valve (12) and the fourteenth valve (14) through the sixth connecting pipe (26), the sixth valve (6) is fixedly connected to the sixth connecting pipe (26) on one side of the first metering pipe (31), the other end of the first metering pipe (31) is communicated with the seventh connecting pipe (27), the third valve (3) is fixedly connected to the seventh connecting pipe (27) on one side of the first metering pipe (31), the seventh connecting pipe (27) is used for being communicated with the sampling unit, the first metering pipe (31) is communicated with the outside through the fourth valve (4), one end of the fifth connecting pipe (25) is communicated to the fourth connecting pipe (24) between the fourteenth valve (14) and the fourteenth valve (52), the other end of the fifth connecting pipe (25) is communicated to the seventh connecting pipe (27) on one side of the third metering pipe (31) is fixedly connected to the seventh connecting pipe (27) on one side of the third metering pipe (31).
5. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 1, wherein: the sampling unit comprises a first valve (1), a second valve (2), an eighth connecting pipe (28), a ninth connecting pipe (29), a tenth connecting pipe (30), a vacuum pump (35), an air pump (36), an oil pump (37), a lower liquid level sensor (38), an upper liquid level sensor (39), a pressure gauge (40) and an oil tank (41), wherein the oil tank (41) is communicated with the ninth connecting pipe (29), the second valve (2) is fixedly connected to the ninth connecting pipe (29), and the ninth connecting pipe (29) is used for communicating equipment to be tested to obtain an oil sample; the oil tank (41) is communicated with a tenth connecting pipe (30), the first valve (1) is fixedly connected to the tenth connecting pipe (30), the tenth connecting pipe (30) is used for communicating oil return of equipment to be tested, and the oil pump (37) is fixedly connected to the tenth connecting pipe (30) at one side of the oil tank (41); the lower liquid level sensor (38) and the upper liquid level sensor (39) are both fixed inside the oil tank (41), the lower liquid level sensor (38) is located at the lower part of the oil tank (41), the upper liquid level sensor (39) is located at the middle part of the oil tank (41), the pressure gauge (40) is fixedly connected to the top of the oil tank (41), the first metering unit is communicated with the upper part of the oil tank (41) through the vacuum pump (35), one end of the eighth connecting pipe (28) is communicated with the upper part of the oil tank (41), the eighth connecting pipe (28) penetrates into the oil tank (41) through the top of the oil tank (41), the other end of the eighth connecting pipe (28) extends into the lower part in the oil tank (41), and the air pump (36) is fixedly connected to the eighth connecting pipe (28) on the outer side of the oil tank (41).
6. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 1, wherein: the gas detection unit (53) comprises a tenth valve (13), a detector (44) and a communication unit (45), one end of the detector (44) is communicated with the gas separation unit (52), the other end of the detector (44) is communicated with the outside through the thirteenth valve (13), the detector (44) is electrically connected with the communication unit (45), and the communication unit (45) is electrically connected with the measurement and control unit (46); the gas separation unit (52) comprises a gas chromatographic column (43) and a pipeline, the gas chromatographic column (43) is communicated with the second quantitative unit through the pipeline, and the gas chromatographic column (43) is communicated with the gas detection unit (53) through the pipeline.
7. A device for checking the accuracy of on-line monitoring of dissolved gases in oil according to claim 3, characterized in that: the seventh valve (7), the eighth valve (8), the ninth valve (9), the tenth valve (10), the eleventh valve (11), the twelfth valve (12) and the fourteenth valve (14) are all electric control valves, and the control end of the measurement and control unit (46) is respectively and independently electrically connected with the control end of each electric control valve.
8. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 4, wherein: the control ends of the measurement and control unit (46) are respectively and independently electrically connected with the control end of each electric control valve.
9. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 5, wherein: the first valve (1) and the second valve (2) are all electric control valves, the control end of the measurement and control unit (46) is respectively and independently electrically connected with the control end of each electric control valve, and the measurement and control unit (46) is respectively and independently electrically connected with the vacuum pump (35), the air pump (36), the oil pump (37), the lower liquid level sensor (38), the upper liquid level sensor (39) and the pressure gauge (40).
10. The apparatus for checking the accuracy of on-line monitoring of dissolved gas in oil according to claim 6, wherein: the thirteenth valve (13) is an electric control valve, and the control end of the measurement and control unit (46) is electrically connected with the control end of the thirteenth valve (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311609638.0A CN117723647A (en) | 2023-11-29 | 2023-11-29 | Device for checking on-line monitoring accuracy of dissolved gas in oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311609638.0A CN117723647A (en) | 2023-11-29 | 2023-11-29 | Device for checking on-line monitoring accuracy of dissolved gas in oil |
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| CN117723647A true CN117723647A (en) | 2024-03-19 |
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| CN202311609638.0A Pending CN117723647A (en) | 2023-11-29 | 2023-11-29 | Device for checking on-line monitoring accuracy of dissolved gas in oil |
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| CN (1) | CN117723647A (en) |
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- 2023-11-29 CN CN202311609638.0A patent/CN117723647A/en active Pending
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