CN112146926A - Transformer oil sampling tool and sampling test method thereof - Google Patents
Transformer oil sampling tool and sampling test method thereof Download PDFInfo
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- CN112146926A CN112146926A CN202010813212.7A CN202010813212A CN112146926A CN 112146926 A CN112146926 A CN 112146926A CN 202010813212 A CN202010813212 A CN 202010813212A CN 112146926 A CN112146926 A CN 112146926A
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- 238000005070 sampling Methods 0.000 title claims abstract description 251
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 239000012159 carrier gas Substances 0.000 claims description 6
- 238000007872 degassing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000003570 air Substances 0.000 description 33
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
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- 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
- G01N2001/1031—Sampling from special places
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- Hydrology & Water Resources (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a transformer oil sampling tool and a sampling test method thereof, wherein the transformer oil sampling tool comprises an oil taking pipe, an oil taking valve and a sampling bottle, the oil taking pipe is connected with the sampling bottle through the oil taking valve, and the bottom of the sampling bottle is provided with a flexible sampling part communicated with the sampling bottle; the oil taking valve is a three-way valve, and three valve ports of the oil taking valve are respectively communicated with the sampling bottle, the oil taking pipe and the outside atmosphere. Extrude the sampling bottle outside with the transformer oil who mixes the air through flexible sampling portion for can not mix the air in the transformer oil that is arranged in the sampling bottle of test, make the chromatogram test result of transformer oil more accurate.
Description
Technical Field
The invention relates to the field of transformer oil sampling and testing tools, in particular to a transformer oil sampling tool and a sampling and testing method thereof.
Background
The insulating oil of the power transformer can play the roles of insulation, heat dissipation and the like, and also can play the role of an information carrier, the running condition of the transformer can be indirectly judged by analyzing the types and the contents of substances dissolved in the oil, and the insulating oil has a positive effect on preventing the faults of the transformer. Therefore, the sampling and transportation of the transformer oil play a decisive role in the accuracy of the test data.
The publication number is "CN 202485940U", and Chinese patent documents whose publication date is 2012 and 10 months and 10 days disclose a transformer oil sampling device, which comprises a sampling bottle and a vacuum pumping container, wherein an oil taking main valve is arranged on an oil outlet of the transformer, the oil taking main valve is connected with a sampling valve through a tee joint, the sampling valve is communicated through one end of a sampling pipe, the other end of the sampling pipe penetrates through the vacuum pumping container and then is arranged in the sampling bottle, and after the sampling bottle is in negative pressure through vacuum pumping air, an oil sample in the transformer is extracted.
However, in the above technical solution, when the sampling device is assembled, air remains in the sampling tube and each valve, so that when the oil sample passes through the sampling tube and each valve, the oil sample flows into the sampling bottle together with the air at each position, resulting in air mixing in the oil sample of the transformer oil. The detection of the transformer oil is carried out according to the method recorded in GB/T17623-1998 gas chromatography method for measuring the content of dissolved gas components in insulating oil, a chromatographic test carrier gas is injected into a sampling bottle to degas the transformer oil, then the test result of the transformer oil is obtained by reading the volume of the gas, and if the transformer oil is mixed with air, the measurement result is inaccurate.
Disclosure of Invention
The invention aims to solve the problem that air is mixed in the transformer oil in the sampling bottle in the prior art, and provides an oil sampling tool for a transformer and a sampling test method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: a transformer oil sampling tool comprises an oil taking pipe, an oil taking valve and a sampling bottle, wherein the oil taking pipe is connected with the sampling bottle through the oil taking valve, and the bottom of the sampling bottle is provided with a flexible sampling part communicated with the sampling bottle; the oil taking valve is a three-way valve, and three valve ports of the oil taking valve are respectively communicated with the sampling bottle, the oil taking pipe and the outside atmosphere. The flexible sampling part can be made of a corrugated pipe, a film bag and other structures which are beneficial to expansion with heat and contraction with cold of the oil sample.
In above-mentioned technical scheme, the sample valve with get the oil pipe and all be the air, when carrying out the transformer oil sample, transformer oil will air mixing, and after the transformer oil that thoughtlessly has the air got into sampling bottle and flexible sample portion, can pass through extrusion flexible sample portion, make the transformer oil that thoughtlessly has the air (the transformer oil that has the bubble promptly) flow through the external valve port of sample valve intercommunication, make the transformer oil portion no longer have the bubble in the sampling bottle, then get the sampling bottle through getting the oil pipe and the sample valve that do not have the air making transformer oil, the transformer oil sample that does not mix the air is obtained at last.
Preferably, the body of the sampling bottle is provided with a scale value. The volume data of the transformer can be conveniently read through the scale value, and the volume of the gas after reaction can be conveniently read when the volume data is detected.
Preferably, the sampling bottle comprises a first sampling part and a second sampling part, the second sampling part is connected with the flexible sampling part, and the diameter of the second sampling part is larger than that of the first sampling part. Transformer oil is taking off the weather, and the gas volume that produces is not many, and the diameter of first sample portion is less than the diameter of second sample portion, is convenient for carry out the reading and make the reading more accurate to the gas volume. And the diameter of the second sampling part is larger, so that more transformer oil can be accommodated.
Preferably, the flexible sampling part is composed of a plurality of sections of flexible corrugated pipes, so that the oil pressure in the container is ensured to be equal to the ambient air pressure, and the overflow of oil samples or the invasion of air is prevented.
Preferably, the sampling bottle is the plastics material, is difficult to the breakage and breaks, more is favorable to the sample and the transport of transformer scene.
The sampling test method of the transformer oil sampling tool is also provided, and based on the transformer oil sampling tool, the sampling test method comprises the following steps:
the method comprises the following steps: closing the sampling valve, and connecting one end of the oil taking pipe, which is far away from the sampling valve, with an oil outlet of the transformer;
step two: rotating the sampling valve to enable the oil taking pipe to be communicated with the sampling bottle, then opening an oil discharge port of the transformer, and enabling the transformer oil to enter the sampling bottle and the flexible sampling part;
step three: after the sampling bottle collects a certain amount of transformer oil, the sampling valve is rotated to enable the sampling bottle to be communicated with the outside atmosphere, the flexible sampling part on the sampling bottle is extruded, and the transformer oil and the bubbles in the bottle are discharged to the outside through the sampling valve;
step four: rotating the sampling valve to communicate the oil taking pipe with the sampling bottle, so that the transformer oil flows into the bottle until the sampling bottle and the flexible sampling part are filled, and then closing the sampling valve;
step five: closing an oil discharge port of the transformer, and disconnecting the connection between the oil taking pipe and the sampling valve;
step six: opening a sampling valve, enabling a sampling bottle to be communicated with one valve port of the sampling valve, extruding a flexible sampling part and flattening the flexible sampling part, enabling a transformer in the sampling bottle to flow out of the valve port, injecting carrier gas for chromatographic test from the valve port, and finally sealing and closing the valve port by adopting a sealing element and closing the sampling valve;
step seven: shaking the sampling bottle and then standing to complete the degassing process of the dissolved gas in the transformer oil; the gas volume is then read according to the scale of the first sampling portion.
Preferably, before the second step, the sampling valve is rotated, the oil taking pipe is communicated with the outside atmosphere, and then the oil discharge port of the transformer is opened, so that the transformer oil flows out through the oil taking pipe and the sampling valve. Partial air in the oil taking pipe and the sampling valve can be discharged to the outside, air entering the sampling bottle in the step two is reduced, the quantity of air bubbles and transformer oil needing to be discharged in the step three is reduced, the workload is reduced, and the working efficiency is improved.
Preferably, before the fourth step, the second step and the third step are repeated at least three times, the sampling bottle is rinsed and no bubble is generated in the bottle.
Preferably, in the sixth step, the sealing element is a rubber cap, and before the valve port of the sampling valve is sealed by the rubber cap, the rubber cap is filled with the transformer oil by extruding the flexible sampling part. When the valve port of the sampling valve is sealed by the rubber cap, the rubber cap is filled with the transformer oil, so that when the valve port of the sampling valve is sealed by the rubber cap, air cannot be mixed into the sampling valve, the transformer oil in the sampling bottle is prevented from being mixed into the air, and the accuracy of testing is ensured.
Preferably, in the seventh step, the sampling bottle is shaken for 20 to 22 minutes at the temperature of between 48 and 52 ℃ and is kept still for 8 to 10 minutes. The carrier gas for chromatographic test can fully react with the transformer oil.
Compared with the prior art, the invention has the beneficial effects that: extrude the sampling bottle outside with the transformer oil who mixes the air through flexible sampling portion for can not mix the air in the transformer oil that is arranged in the sampling bottle of test, make the chromatogram test result of transformer oil more accurate. According to the method for sampling and testing by using the transformer oil sampling tool, in the process of sampling and testing the transformer by using the tool, the transformer oil in the sampling bottle is ensured not to be mixed with air, so that the test result is more accurate; meanwhile, the sampling tool can be directly used for testing, the transformer oil does not need to be converted into other appliances, and the process is saved and the risk of pollution of the transformer oil is avoided.
Drawings
FIG. 1 is a schematic diagram of a transformer oil sampling tool according to the present invention;
fig. 2 is a schematic diagram of the structure of the sampling bottle and the sampling valve of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1
As shown in fig. 1-2, an embodiment of a transformer oil sampling tool includes an oil sampling tube 1, an oil sampling valve 2, and a sampling bottle 3, wherein the oil sampling tube 1 is connected to the sampling bottle 3 through the oil sampling valve 2, and a flexible sampling portion 4 communicated with the sampling bottle 3 is disposed at the bottom of the sampling bottle 3; the oil taking valve 2 is a three-way valve, and three valve ports of the oil taking valve 2 are respectively communicated with the sampling bottle 3, the oil taking pipe 1 and the outside atmosphere.
Specifically, the body of the sampling bottle 3 is provided with a scale value. The volume data of the transformer can be conveniently read through the scale value, and the volume of the gas after reaction can be conveniently read when the volume data is detected.
The sampling bottle 3 comprises a first sampling part 301 and a second sampling part 302, the second sampling part 302 is connected with the flexible sampling part 4, and the diameter of the second sampling part 302 is larger than that of the first sampling part 301. When the transformer oil is subjected to climate removal, the volume of generated gas is not large, and the diameter of the first sampling part 301 is smaller than that of the second sampling part 302, so that the gas volume can be read conveniently and the reading is more accurate. And the diameter of the second sampling portion 302 is larger, so that more transformer oil can be accommodated.
In addition, the flexible sampling part 4 is composed of a plurality of sections of flexible corrugated pipes, so that the oil pressure in the container can be ensured to be equal to the ambient air pressure, and the overflow of oil samples or the invasion of air can be prevented. The sampling bottle 3 is made of plastic, is not easy to break and fracture, and is more favorable for sampling and carrying in a power transformation site.
The working principle or working process of the invention is as follows: in above-mentioned technical scheme, the sampling valve with get oil pipe 1 and all be the air, when carrying out the transformer oil sample, transformer oil will air mixing, and after the transformer oil that thoughtlessly has the air got into sampling bottle 3 and flexible sample portion 4, can pass through extrusion flexible sample portion 4, make the transformer oil that thoughtlessly has the air (the transformer oil that has the bubble promptly) flow through the external valve port of sampling valve intercommunication for the transformer oil portion in the sampling bottle 3 no longer has the bubble.
The beneficial effects of this embodiment: extrude the sampling bottle 3 outside with the transformer oil who thoughtlessly has the air through flexible sampling portion 4 for can not have thoughtlessly the air in the transformer oil in the sampling bottle 3 for the test, make the chromatogram test result of transformer oil more accurate.
Example 2
An embodiment of a sampling test method for a transformer oil sampling tool is based on the transformer oil sampling tool of embodiment 1, and comprises the following steps:
the method comprises the following steps: closing the sampling valve, and connecting one end of the oil taking pipe 1, which is far away from the sampling valve, with an oil discharge port of the transformer;
step two: rotating the sampling valve to enable the oil taking pipe 1 to be communicated with the sampling bottle 3, then opening an oil discharging port of the transformer, and enabling the transformer oil to enter the sampling bottle 3 and the flexible sampling part 4;
step three: after the sampling bottle 3 collects a certain amount of transformer oil, the sampling valve is rotated to communicate the sampling bottle 3 with the outside atmosphere, the flexible sampling part 4 on the sampling bottle 3 is extruded, and the transformer oil and the bubbles in the bottle are discharged to the outside through the sampling valve;
step four: rotating the sampling valve to enable the oil taking pipe 1 to be communicated with the sampling bottle 3, enabling the transformer oil to flow into the bottle until the sampling bottle 3 and the flexible sampling part 4 are filled, and then closing the sampling valve;
step five: closing an oil discharge port of the transformer, and disconnecting the oil taking pipe 1 from the sampling valve;
step six: opening the sampling valve, communicating the sampling bottle 3 with one valve port of the sampling valve, extruding the flexible sampling part 4 and flattening the flexible sampling part, enabling the transformer in the sampling bottle 3 to flow out of the valve port, injecting carrier gas for chromatographic test from the valve port, sealing and closing the valve port by adopting a sealing element, and closing the sampling valve;
step seven: shaking the sampling bottle 3 and then standing to complete the degassing process of the dissolved gas in the transformer oil; the gas volume is then read according to the scale of the first sampling portion 301.
Before the second step, the sampling valve is rotated, the oil taking pipe 1 is communicated with the outside atmosphere, and then the oil discharge port of the transformer is opened, so that the transformer oil flows out through the oil taking pipe 1 and the sampling valve. Can get during oil pipe 1 and the air discharge of sample valve part earlier to the external world, reduce the air that gets into sampling bottle 3 in step two, make the quantity of the bubble that needs the combustion gas and transformer oil reduce in step three, reduce work load, improve work efficiency.
In order to ensure that no bubbles exist in the sampling bottle 3, the second step and the third step are repeated at least three times before the fourth step is carried out, and the sampling bottle 3 is rinsed to ensure that no bubbles exist in the bottle.
Specifically, in the sixth step, the sealing element is a rubber cap, and before the valve port of the sampling valve is sealed by the rubber cap, the rubber cap is filled with the transformer oil by extruding the flexible sampling part 4. When the valve port of the sampling valve is sealed by the rubber cap, the rubber cap is filled with the transformer oil, so that when the valve port of the sampling valve is sealed by the rubber cap, air cannot be mixed into the sampling valve, the transformer oil in the sampling bottle 3 is prevented from being mixed into the air, and the accuracy of testing is ensured.
In addition, in step seven, the sampling bottle 3 is shaken for 20 minutes at 50 ℃ and left for 10 minutes. The carrier gas for chromatographic test can fully react with the transformer oil.
The beneficial effects of this embodiment: the method for sampling and testing by using the transformer oil sampling tool ensures that the transformer oil in the sampling bottle is not mixed with air in the process of sampling and testing the transformer by using the tool, so that the test result is more accurate; meanwhile, the sampling tool can be directly used for testing, the transformer oil does not need to be converted into other appliances, and the process is saved and the risk of pollution of the transformer oil is avoided.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A transformer oil sampling tool comprises an oil taking pipe (1), an oil taking valve (2) and a sampling bottle (3), wherein the oil taking pipe (1) is connected with the sampling bottle (3) through the oil taking valve (2), and the transformer oil sampling tool is characterized in that a flexible sampling part (4) communicated with the sampling bottle (3) is arranged at the bottom of the sampling bottle (3); the oil taking valve (2) is a three-way valve, and three valve ports of the oil taking valve (2) are respectively communicated with the sampling bottle (3), the oil taking pipe (1) and the outside atmosphere.
2. The transformer oil sampling tool according to claim 1, characterized in that the body of the sampling bottle (3) is provided with scale values.
3. The transformer oil sampling tool according to claim 2, wherein the sampling bottle (3) comprises a first sampling part (301) and a second sampling part (302), the second sampling part (302) is connected with the flexible sampling part (4), and the diameter of the second sampling part (302) is larger than that of the first sampling part (301).
4. A transformer oil sampling tool according to claim 3, characterized in that the flexible sampling part (4) is composed of a plurality of sections of flexible bellows.
5. The transformer oil sampling tool according to any one of claims 1 to 4, wherein the sampling bottle (3) is made of plastic.
6. A sampling test method of a transformer oil sampling tool is characterized in that the transformer oil sampling tool based on claim 4 comprises the following steps:
the method comprises the following steps: closing the sampling valve, and connecting one end of the oil taking pipe (1) far away from the sampling valve with an oil discharge port of the transformer;
step two: rotating the sampling valve to enable the oil taking pipe (1) to be communicated with the sampling bottle (3), then opening an oil discharging port of the transformer, and enabling the transformer oil to enter the sampling bottle (3) and the flexible sampling part (4);
step three: after a certain amount of transformer oil is collected by the sampling bottle (3), rotating the sampling valve to enable the sampling bottle (3) to be communicated with the outside atmosphere, extruding a flexible sampling part (4) on the sampling bottle (3), and discharging the transformer oil and bubbles in the bottle to the outside through the sampling valve;
step four: rotating the sampling valve to enable the oil taking pipe (1) to be communicated with the sampling bottle (3), enabling the transformer oil to flow into the bottle until the sampling bottle (3) and the flexible sampling part (4) are filled, and then closing the sampling valve;
step five: the oil discharge port of the transformer is closed, and the connection between the oil taking pipe (1) and the sampling valve is disconnected;
step six: opening the sampling valve, communicating the sampling bottle (3) with one valve port of the sampling valve, extruding the flexible sampling part (4) and flattening the flexible sampling part, then injecting carrier gas for chromatographic test from the valve port, and finally sealing and closing the valve port by adopting a sealing element and closing the sampling valve;
step seven: shaking the sampling bottle (3) and then standing to complete the degassing process of the dissolved gas in the transformer oil; the gas volume is then read according to the scale of the first sampling portion (301).
7. The sampling test method according to claim 6, wherein before the second step, the sampling valve is rotated to connect the oil taking pipe (1) with the outside atmosphere, and then the oil outlet of the transformer is opened to allow the transformer oil to flow out through the oil taking pipe (1) and the sampling valve.
8. The sampling testing method of claim 6, wherein step two and step three are repeated at least three times before step four is performed.
9. The sampling test method according to claim 6, characterized in that in the sixth step, the sealing element is a rubber cap, and the rubber cap is filled with the transformer oil by squeezing the flexible sampling part (4) before the rubber cap is used for sealing the valve port of the sampling valve.
10. The sampling test method according to claim 6, characterized in that in the seventh step, the sampling bottle (3) is shaken for 20-22 minutes in an environment of 48-52 ℃ and is left for 8-10 minutes.
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| CN202010813212.7A CN112146926A (en) | 2020-08-13 | 2020-08-13 | Transformer oil sampling tool and sampling test method thereof |
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| CN202010813212.7A CN112146926A (en) | 2020-08-13 | 2020-08-13 | Transformer oil sampling tool and sampling test method thereof |
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Application publication date: 20201229 |