CN112033852B - Method for detecting gas content of oil sample - Google Patents
Method for detecting gas content of oil sample Download PDFInfo
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- CN112033852B CN112033852B CN202010956448.6A CN202010956448A CN112033852B CN 112033852 B CN112033852 B CN 112033852B CN 202010956448 A CN202010956448 A CN 202010956448A CN 112033852 B CN112033852 B CN 112033852B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000002699 waste material Substances 0.000 claims abstract description 19
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims description 17
- 238000009849 vacuum degassing Methods 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 103
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for detecting the gas content of an oil sample, which comprises a sealed vessel, a quantitative sampler, a vacuumizing device, a vacuum degree measuring device and a waste oil collector; the oil extraction valve of the transformer is connected with the oil inlet of the quantitative sampler through an oil pipe, the oil outlet of the quantitative sampler is communicated with the waste oil collector through an oil pipe, the oil outlet of the quantitative sampler is connected with a plurality of branch pipes, each branch pipe is correspondingly communicated with the oil inlet of a vessel, the air vent of each vessel is communicated with the same vacuumizing device through an oil pipe, and the valve is arranged on each oil pipe and each branch pipe; two sides of the valve of each branch pipeline are connected with a vacuum degree measuring device; and then controlling the related valves to sequentially sample and vacuumize, and detecting the gas content of the oil sample. The detection method can detect a plurality of samples of the transformer oil on site at the same time, can improve the detection speed, reduce the detection cost and save labor.
Description
Technical Field
The invention belongs to the technical field of electric power tests, and particularly relates to an oil sample gas content detection method.
Background
The gas content in the oil refers to the volume percentage content of dissolved gas in the transformer oil, and according to professional data statistics, a new operation transformer oil sample in a gas content experiment in the oil accounts for more than 85% of total detection samples, namely, the vast majority is to detect the gas content of the new operation transformer oil, and the main component of the gas content in the new operation transformer oil is air (other components are not generated yet), so that a method for rapidly detecting the gas content in a plurality of test oils is very important for the new operation transformer oil.
The current detection methods include gas chromatography and vacuum degassing. The detection of the gas content index in the oil is to prevent bubble discharge faults caused by excessive gas content in the oil, and the current GB/T7595-2008 'quality standard of transformer oil in operation' requires the gas content detection of the transformer oil newly put into operation for more than 330 kilovolts. The main component of the gas content in the oil is air, and the main component of the gas content in the transformer oil for long-term operation is air, carbon dioxide, carbon monoxide and hydrocarbon. The gas chromatograph method has long detection time, including a sample oscillation link and a gas chromatograph detection link, the time required for detecting a sample is approximately 3 hours, and only one sample can be detected each time, which is unfavorable for rapid detection and has high instrument price; the accuracy of the vacuum degassing method is mainly related to the vacuumizing degree, the systematic error is larger, and the detection time is close to one hour because the vacuum degree of the detection cavity needs to be checked and the oil sample needs to be preheated before each detection, and only one sample can be detected each time, so that the working efficiency is low. In order to improve the above-mentioned situation, there are, for example, chinese patent publication No. CN107063920B and publication date 2019.11.29-a device and method for measuring the gas content in insulating oil, in which the sample is extracted by a piston on site to directly perform detection, so that the detection process is simplified, but only one sample can be detected at a time, and the working efficiency is low.
Disclosure of Invention
The invention provides a detection method for the gas content of an oil sample, which can detect a plurality of samples of transformer oil on site at the same time, can improve the detection speed, reduce the detection cost and save labor.
The technical scheme of the invention is as follows:
the method for detecting the gas content of the oil sample comprises the following steps of:
s1, preparing equipment: the device comprises a sealed vessel, a quantitative sampler, a vacuumizing device, a vacuum degree measuring device and a waste oil collector;
s2, equipment connection: the oil extraction valve of the transformer is connected with the oil inlet of the quantitative sampler through an oil pipe, the oil outlet of the quantitative sampler is communicated with the waste oil collector through an oil pipe, the oil outlet of the quantitative sampler is connected with a plurality of branch pipes, each branch pipe is correspondingly communicated with the oil inlet of a vessel, the air vent of each vessel is communicated with the same vacuumizing device through an oil pipe, and the valve is arranged on each oil pipe and each branch pipe; two sides of the valve of each branch pipeline are connected with a vacuum degree measuring device;
s3, sampling: before sampling, opening two valves of an oil inlet and an oil outlet of the quantitative sampler, closing the rest valves, opening an oil taking valve of the transformer when sampling, enabling an oil sample to enter the quantitative sampler through the oil inlet, continuing to feed the oil after the quantitative sampler is filled with the oil sample, discharging the oil mass which is M times of the volume of the oil outlet of the quantitative sampler to a waste oil collector, closing the valves of the oil inlet and the oil outlet of the quantitative sampler, closing the oil taking valve of the transformer, and completing sampling of the oil sample;
s4, vacuumizing: opening valves at air vents of all vessels, starting a vacuumizing device to vacuumize all vessels simultaneously, and marking the pressure value of each vessel in a sectional manner;
s5, detecting the gas content of the oil sample: opening valves of branch pipelines between the quantitative sampler and all vessels, completely flowing out the oil sample from the quantitative sampler, respectively flowing into each vessel, starting all vacuum degree measuring devices to measure, reading the vacuum degree of each vacuum degree measuring device, and calculating the gas content value in the insulating oil sample of each vessel according to the corresponding vessel vacuum degree and gas volume;
s6, closing valves of branch pipelines between the quantitative sampler and all the vessels, closing the vacuum degree measuring device, removing the branch pipelines between the quantitative sampler and the vessels, and discharging the detected oil sample from the oil inlet of the vessels to finish detection.
Further, the gas volume in S5 is obtained from the front-to-back pressure difference inside the vessel.
Further, the valve adopts a hydraulic control one-way valve.
Further, the specific operation mode of the pressure value segmentation marker in S4 is as follows: if the pressure value is less than 50Pa, recording the pressure value at the moment as a first pressure value P1, continuously vacuumizing, recording the pressure value at the moment as a second pressure value P2 after X seconds, if P2-P1 is more than 1Pa after N X seconds, sending out an alarm, and if P2-P1 is less than or equal to 1Pa, next, wherein N and X are positive integers.
Further, after the valve is closed, the pressure value is counted again; and (3) recording once after X seconds, wherein the pressure difference between the two times is a pressure rising value, and obtaining the front and back volume changes in the vessel according to the pressure difference.
Further, the vacuum degree measuring device adopts a vacuum degree tester.
Further, the vacuum pumping device adopts a vacuum degassing tank.
Further, when the gas content of the oil sample is detected for a plurality of times, the test state of the equipment is kept the same, and the conditions of the test state of the equipment comprise the volume of the quantitative sampler, the temperature of the vacuum degassing tank, the thermodynamic temperature of the vacuum degassing tank, the pressure generated in the vacuum degassing tank by the gas stripped from the sample oil and the volume of the vacuum degassing tank.
Further, the waste oil collector is a waste oil collecting barrel.
Further, the value range of M in S3 is: m is more than or equal to 2 and less than or equal to 4, wherein M is a positive integer.
The beneficial effects of the invention are as follows:
according to the invention, a plurality of branch sampling pipelines are arranged and connected with the same group of vacuum degree measuring devices, after sampling, the air content of a plurality of sampled oil samples is detected simultaneously by controlling the valves, so that the efficiency and the speed are high; the invention has simple operation, can complete the detection on site only by controlling the valve of the corresponding pipeline according to the detection requirement and starting the vacuum degree measuring device and the vacuumizing device, and saves the labor.
Drawings
FIG. 1 is a schematic diagram of a device connection of the present invention;
in the figure: vessel 1, quantitative sampler 2, vacuumizing device 3, vacuum degree measuring device 4, waste oil collector 5 and transformer 6.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1, the method for detecting the gas content of the oil sample comprises the following steps:
s1, preparing equipment: a sealed vessel 1, a quantitative sampler 2, a vacuumizing device 3, a vacuum degree measuring device 4 and a waste oil collector 5;
s2, equipment connection: the oil extraction valve of the transformer 6 is connected with the oil inlet of the quantitative sampler 2 through an oil pipe, the oil discharge port of the quantitative sampler 2 is communicated with the waste oil collector 5 through an oil pipe, the oil outlet of the quantitative sampler 2 is connected with a plurality of branch pipes, each branch pipe is correspondingly communicated with the oil inlet of one vessel 1, the air vent of each vessel 1 is communicated with the same vacuumizing device 3 through an oil pipe, and the valve is arranged on each oil pipe and each branch pipe; the two sides of the valve of each branch pipeline are connected with a vacuum degree measuring device 4;
s3, sampling: before sampling, opening two valves of an oil inlet and an oil outlet of the quantitative sampler 2, closing the rest valves, opening an oil taking valve of the transformer 6 during sampling, enabling an oil sample to enter the quantitative sampler 2 through the oil inlet, continuing to feed the oil after the quantitative sampler 2 is filled with the oil sample, closing the valves of the oil inlet and the oil outlet of the quantitative sampler 2 after the oil outlet of the quantitative sampler 2 discharges the oil quantity M times of the volume of the oil to the waste oil collector 5, and closing the oil taking valve of the transformer 6 to finish sampling of the oil sample;
s4, vacuumizing: opening valves at the air vents of all vessels 1, starting a vacuumizing device 3 to vacuumize all vessels 1 simultaneously, and marking the pressure value of each vessel 1 in a sectional manner;
s5, detecting the gas content of the oil sample: opening valves of branch pipelines between the quantitative sampler 2 and all vessels 1, completely flowing out the oil sample from the quantitative sampler 2 and respectively flowing into each vessel 1, starting all vacuum degree measuring devices 4 to measure, reading the vacuum degree of each vacuum degree measuring device 4, and calculating the gas content value in the insulating oil sample of each vessel 1 according to the vacuum degree and the gas volume of the corresponding vessel 1;
s6, closing valves of branch pipelines between the quantitative sampler 2 and all the vessels 1, closing the vacuum degree measuring device 4, removing the branch pipelines between the quantitative sampler 2 and the vessels 1, and discharging the detected oil sample from the oil inlet of the vessels 1 to finish detection.
Wherein, the gas volume in S5 is obtained according to the front-back pressure difference inside the vessel 1.
In this embodiment, the valve is a pilot operated check valve.
In this embodiment, the specific operation manner of the pressure value segment marking in S4 is: if the pressure value is less than 50Pa, recording the pressure value at the moment as a first pressure value P1, continuously vacuumizing, recording the pressure value at the moment as a second pressure value P2 after X seconds, if P2-P1 is more than 1Pa after N X seconds, sending out an alarm, and if P2-P1 is less than or equal to 1Pa, next, wherein N and X are positive integers. After closing the valve, counting the pressure value again; after X seconds, recording is performed once, the differential pressure of the two times is the pressure rise value, and the front-back volume change of the inside of the vessel 1 is obtained according to the differential pressure.
In the present embodiment, the vacuum degree measuring device 4 adopts a vacuum degree tester, and the evacuating device 3 adopts a vacuum degassing tank.
In this embodiment, when the gas content of the oil sample is detected for a plurality of times, the test state of the apparatus is kept the same, and the conditions of the test state of the apparatus include the volume of the quantitative sampler 2, the celsius temperature of the vacuum degassing tank, the thermodynamic temperature of the vacuum degassing tank, the pressure generated in the vacuum degassing tank by the gas extracted from the sample oil, and the volume of the vacuum degassing tank.
In the present embodiment, the waste oil collector 5 is a waste oil collecting bucket.
In this embodiment, the range of values of M in S3 is: m is more than or equal to 2 and less than or equal to 4, wherein M is a positive integer. After the oil sample is filled in the quantitative sampler 2, oil is continuously fed, after the oil discharge port of the quantitative sampler 2 discharges the oil quantity which is M times of the volume of the oil discharge port to the waste oil collector 5, the valves at the oil inlet and the oil discharge port of the quantitative sampler 2 are closed again, so that the dead oil flowing out of the transformer 6 initially is discharged, the quantitative sampler 2 is cleaned, and the vacuum degree measuring device 4 is prevented from being influenced to measure the vacuum degree.
Compared with the existing sampling equipment, the invention has the advantages that the plurality of branch sampling pipelines are arranged and are connected with the same group of vacuum degree measuring devices, after sampling, the air content of a plurality of sampled oil samples is detected simultaneously by controlling the valve, and the detection is efficient and rapid; the invention has simple operation, can complete the detection on site only by controlling the valve of the corresponding pipeline according to the detection requirement and starting the vacuum degree measuring device and the vacuumizing device, and saves the labor.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. The method for detecting the gas content of the oil sample is characterized by comprising the following steps of:
s1, preparing equipment: the device comprises a sealed vessel, a quantitative sampler, a vacuumizing device, a vacuum degree measuring device and a waste oil collector; wherein, the vacuumizing device adopts a vacuum degassing tank;
s2, equipment connection: the oil extraction valve of the transformer is connected with the oil inlet of the quantitative sampler through an oil pipe, the oil outlet of the quantitative sampler is communicated with the waste oil collector through an oil pipe, the oil outlet of the quantitative sampler is connected with a plurality of branch pipes, each branch pipe is correspondingly communicated with the oil inlet of a vessel, the air vent of each vessel is communicated with the same vacuumizing device through an oil pipe, and the valve is arranged on each oil pipe and each branch pipe; two sides of the valve of each branch pipeline are connected with a vacuum degree measuring device;
s3, sampling: before sampling, opening two valves of an oil inlet and an oil outlet of the quantitative sampler, closing the rest valves, opening an oil taking valve of the transformer when sampling, enabling an oil sample to enter the quantitative sampler through the oil inlet, continuing to feed the oil after the quantitative sampler is filled with the oil sample, discharging the oil mass which is M times of the volume of the oil outlet of the quantitative sampler to a waste oil collector, closing the valves of the oil inlet and the oil outlet of the quantitative sampler, closing the oil taking valve of the transformer, and completing sampling of the oil sample;
s4, vacuumizing: opening valves at air vents of all vessels, starting a vacuumizing device to vacuumize all vessels simultaneously, and marking the pressure value of each vessel in a sectional manner; the specific operation mode of the pressure value segmentation mark is as follows: if the pressure value is less than 50Pa, recording the pressure value at the moment as a first pressure value P1, continuously vacuumizing, recording the pressure value at the moment as a second pressure value P2 after X seconds, if P2-P1 is more than 1Pa after N X seconds, sending out an alarm, and if P2-P1 is less than or equal to 1Pa, next, wherein N and X are positive integers; after closing the valve, counting the pressure value again; recording once after X seconds, wherein the pressure difference of the two times is a pressure rising value, and obtaining the front-back volume change of the inside of the vessel according to the pressure difference;
s5, detecting the gas content of the oil sample: opening valves of branch pipelines between the quantitative sampler and all vessels, completely flowing out the oil sample from the quantitative sampler, respectively flowing into each vessel, starting all vacuum degree measuring devices to measure, reading the vacuum degree of each vacuum degree measuring device, and calculating the gas content value in the insulating oil sample of each vessel according to the corresponding vessel vacuum degree and gas volume; wherein, the gas volume is obtained according to the front-back pressure difference inside the vessel; when the gas content of the oil sample is detected for a plurality of times, the test state of the equipment is kept the same, and the conditions of the test state of the equipment comprise the volume of a quantitative sampler, the temperature of the vacuum degassing tank, the thermodynamic temperature of the vacuum degassing tank, the pressure generated in the vacuum degassing tank by the gas stripped from the sample oil and the volume of the vacuum degassing tank;
s6, closing valves of branch pipelines between the quantitative sampler and all the vessels, closing the vacuum degree measuring device, removing the branch pipelines between the quantitative sampler and the vessels, and discharging the detected oil sample from the oil inlet of the vessels to finish detection.
2. The method for detecting the gas content of the oil sample according to claim 1, wherein the valve is a hydraulic control one-way valve.
3. The method for detecting the gas content of the oil sample according to claim 1, wherein the vacuum measuring device adopts a vacuum tester.
4. The method of claim 1, wherein the waste oil collector is a waste oil collection tank.
5. The method for detecting the gas content of the oil sample according to claim 1, wherein the range of the value of M in S3 is as follows: m is more than or equal to 2 and less than or equal to 4, wherein M is a positive integer.
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|---|---|---|---|---|
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| CN104880538A (en) * | 2015-05-30 | 2015-09-02 | 国家电网公司 | Device and method for on-site inspection of online monitor for dissolved gas in transformer oil |
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| CN106872613A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of standard transformer oil sample device for formulating and its operating method |
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| CN111581596A (en) * | 2020-05-29 | 2020-08-25 | 广东电网有限责任公司 | Method for predicting concentration of dissolved gas in transformer oil |
-
2020
- 2020-09-11 CN CN202010956448.6A patent/CN112033852B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2439672Y (en) * | 2000-08-01 | 2001-07-18 | 顾国城 | Pressure difference instrument for measuring gas content in oil |
| CN2627495Y (en) * | 2003-06-18 | 2004-07-21 | 诸建华 | Air content determinator of oil |
| CN103499470A (en) * | 2013-09-29 | 2014-01-08 | 广州供电局有限公司 | Sampling device and sampling method for gas content of insulating oil |
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| CN112033852A (en) | 2020-12-04 |
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