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DL/T 1985-2019: Determination of mining ratio of SF6 gas mixture
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Determination of mining ratio of SF6 gas mixture
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DL/T 1985-2019
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Basic data | Standard ID | DL/T 1985-2019 (DL/T1985-2019) | | Description (Translated English) | Determination of mining ratio of SF6 gas mixture | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Classification of International Standard | 27.100 | | Word Count Estimation | 8,870 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | DL/T 1032 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the sensor method and gas chromatography method for determining the gas mixture ratio of sulfur hexafluoride (SF6) mixed insulating gas. This standard is applicable to the detection of the gas mixture ratio in SF6/CF4, SF6/N2 mixed gas insulation equipment, and the detection of other SF6 mixed insulation gas mixture ratios can be carried out by reference. | DL/T 1985-2019: Determination of mining ratio of SF6 gas mixture---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of mining ratio of SF6 gas mixture
DL/T 996-2019
ICS 27.100
F 20
People's Republic of China Electric Power Industry Standard
Detection method for mixing ratio of sulfur hexafluoride mixed insulating gas
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
DL/T 996-2019
Table of contents
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Sampling...1
5 Testing...1
DL/T 996-2019
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the National Electrochemical Standards Technical Committee.
Drafting organizations of this standard. State Grid Anhui Electric Power Co., Ltd. Electric Power Research Institute, China Electric Power Research Institute Co., Ltd.,
State Grid Hubei Electric Power Co., Ltd. Maintenance Company, State Grid Shandong Electric Power Company Electric Power Research Institute, State Grid Fujian Electric Power Co., Ltd.
Company Electric Power Research Institute, Guangxi Power Grid Corporation Electric Power Research Institute, State Grid Jiangsu Electric Power Research Institute,
Henan Hitachi Xin Co., Ltd., Langxi Instrument (Shanghai) Co., Ltd.
The main drafters of this standard. Qi Jiong, Ma Fengxiang, Zhu Feng, Ji Yansong, Fu Hanjiang, Yu Naihai, Lian Hongsong, Zhu Liping, Zhu
Hong Bin, Li Jianguo, Li Jianhao, Yan Xianglian, Yuan Xiaofang, Liu Wei, Song Yumei, Zheng Dongsheng.
This standard is formulated for the first time.
The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Center of the China Electricity Council (Baiguang Road 2nd, Beijing)
Article No. 1, 100761).
Detection method for mixing ratio of sulfur hexafluoride mixed insulating gas
1 Scope
This standard specifies the sensor method and chromatographic method for determining the mixing ratio of sulfur hexafluoride (SF6) mixed insulating gas.
This standard applies to the detection of gas mixture ratio in SF6/CF4, SF6/N2 mixed gas insulation equipment, and other SF6 mixtures
Insulating gas mixture ratio detection can be implemented by reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version
Applies to this document. For undated references, the latest version (including all amendments) applies to this document.
DL/T 1032 Sulfur hexafluoride (SF6) gas sampling method for electrical equipment
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
SF6 gas mixture
SF6 gas is an insulating gas mixed with another gas in a certain proportion.
3.2
SF6 gas mixture insulated equipment
Electrical equipment that uses SF6 mixed gas as an insulating medium.
3.3
Gas mixture rate
The volume fraction of SF6 in the SF6 mixed gas.
4 sampling
4.1 On-site analysis and sampling
Connect the pipeline according to the requirements of the testing instrument, adopt the lead-in sampling, flush the pipeline for 3 to 5 minutes, and then sample for testing.
4.2 Laboratory analysis and sampling
Follow the relevant regulations in DL/T 1032.
5 detection
5.1 Sensor method
5.1.1 Method summary
Use thermal conductivity or infrared sensor to detect the difference in thermal conductivity or infrared absorption characteristics between SF6 and another gas
The mixing ratio of the mixed gas; at the same time, an electrochemical sensor is used to detect the O2 content in the gas. The detection process is shown in Figure 1.
5.1.2 Instrument requirements
5.1.3 Environmental conditions
a) Temperature. -10℃ ~ 40℃;
b) Humidity. ≤85%RH.
5.1.4 Test steps
Operate as follows.
a) Turn on the power of the instrument and perform the corresponding settings according to the instructions after the instrument has been warmed up;
b) Confirm that the air inlet valve of the instrument is in the closed state, connect the air inlet of the air source and the sampling port of the instrument, and connect the exhaust gas collection device
Connect to the exhaust port of the instrument;
c) During measurement, keep the oxygen sensor protection valve in a closed state, slowly open the gas flow regulating valve, and open the side
Valve, flush the pipeline for 3 min~5 min, then adjust the gas flow to the setting range and open the protection valve to start
After the test data is stable, record the SF6 and O2 test results;
d) After the measurement is completed, the instrument should be purged with dry nitrogen for 3 min~5 min, first close the oxygen sensor protection valve, and then
Turn off the instrument;
e) Recycle the gas in the exhaust gas collection device.
5.1.5 Test results
Take the arithmetic mean of two parallel determination results as the test result, and the test result is expressed in volume fraction.
5.1.6 Precision
The absolute deviation of the two test results is SF6≤1%, O2≤0.1%.
5.2 Gas chromatography
5.2.1 Method summary
The chromatographic column is used to separate SF6, CF4, N2, O2 and other components, and the gas of each component is entered through a thermal conductivity detector (TCD).
Line testing. The test result is expressed in volume fraction.
5.2.2 Apparatus and materials
a) Gas chromatograph. It should be equipped with a TCD detector, which can detect SF6, CF4, N2, O2 and other components, and can be used
Data analysis is carried out by external standard method and calibration standardization method. See Table 1 for typical gas path flow.
5.2.3 Environmental conditions
a) Temperature. -10℃ ~ 40℃;
b) Humidity. ≤85%RH.
5.2.4 Detection steps
Operate as follows.
a) Set the working parameters of the chromatograph according to the requirements of the instrument, and wait until the instrument is stable for use;
b) Use external standard method to quantitatively calibrate the chromatograph. The calibration working conditions of the instrument should be the same as the detection conditions.
The specified repeatability should not be greater than ±3%;
c) Connect the gas inlet of the gas source to be tested and the sampling port of the chromatograph, and control the flow of the gas to be tested according to the conditions of use of the chromatograph
Flush the sampling pipeline and the loop for no less than 3 minutes, close the sampling port of the chromatograph, switch the loop valve, and quickly
Sample injection
d) Record the peak area (or peak height) of each component and analyze the data;
e) After the test is completed, turn off the chromatograph according to the instrument operation procedure, and turn off the power and all gas sources.
5.2.5 Sample chromatogram
Typical chromatograms are shown in Figure 2 and Figure 3.
5.2.6.2 Calculating gas mixture ratio by external standard method
According to the peak area (or peak height) of each component, calculate the SF6, CF4, N2, O2 in the mixed gas according to formula (3)
Etc. content
5.2.7 Precision
The absolute deviation of the two test results is SF6, N2, CF4≤0.5%, O2≤0.05%.
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