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DL/T 1986-2019: Technical specification for gas detecting in SF6 gas mixture insulated equipment
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| DL/T 1986-2019 | English | 259 |
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Technical specification for gas detecting in SF6 gas mixture insulated equipment
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DL/T 1986-2019
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Basic data | Standard ID | DL/T 1986-2019 (DL/T1986-2019) | | Description (Translated English) | Technical specification for gas detecting in SF6 gas mixture insulated equipment | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Classification of International Standard | 27.100 | | Word Count Estimation | 11,188 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 8905; GB/T 11023; DL/T 506; DL/T 639; DL/T 916; DL/T 918; DL/T 919; DL/T 921; DL/T 1032; DL/T 1205; DL/T 1823 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the test items, test period and test methods for sulfur hexafluoride (SF6) mixed gas in electrical equipment. This standard applies to the detection of SF6/CF4, SF6/Nz mixed gas in electrical equipment. | DL/T 1986-2019: Technical specification for gas detecting in SF6 gas mixture insulated equipment---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.
Technical specification for gas detecting in SF6 gas mixture insulated equipment
ICS 27.100
F 20
People's Republic of China Electric Power Industry Standard
Sulfur hexafluoride mixed gas insulation equipment gas
Testing technical specifications
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Testing items, testing cycle and testing methods...2
5 Sampling...2
6 Testing...2
7 Safety Precautions...8
8 Test report...8
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 Chongqing Electric Power Company Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute, State Grid Shandong Electric Power
Power Research Institute, State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute, State Grid Hubei Electric Power Co., Ltd.
Force Science Research Institute, Henan Hitachixin Co., Ltd., Shandong Zhonghui Instrument Co., Ltd.
The main drafters of this standard. Qi Jiong, Ma Fengxiang, Liu Zien, Yan Xianglian, Yao Qiang, Zhu Hongbin, Yu Naihai, Ming Julan, Cai
Xuan, Li Jianguo, Wang Yong, Ji Yansong, Zhao Yue, Cheng Wei, Yuan Ping.
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).
DL/T 996-2019
Technical specification for gas detection of SF6 mixed gas insulation equipment
1 Scope
This standard specifies the testing items, testing period and testing methods of SF6 mixed gas in electrical equipment
law.
This standard applies to the detection of SF6/CF4 and SF6/N2 mixed gases in electrical equipment.
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.
GB/T 8905 Guidelines for Gas Management and Detection in Electrical Equipment of Sulfur Hexafluoride
GB 11023 High-voltage switchgear sulfur hexafluoride gas tightness test method
DL/T 506 Insulating gas humidity measurement method in sulphur hexafluoride electrical equipment
DL/T 639 Safety protection guidelines for personnel operating, testing and overhauling sulfur hexafluoride electrical equipment
DL/T 916 Determination of acidity of sulfur hexafluoride gas
DL/T 918 Determination of hydrolyzable fluoride content in sulfur hexafluoride gas
DL/T 919 Determination of mineral oil content in sulfur hexafluoride gas (infrared spectroscopy method)
DL/T 921 Biological test method for toxicity of sulfur hexafluoride gas
DL/T 1032 Sulfur hexafluoride (SF6) gas sampling method for electrical equipment
DL/T 1205 Test method for decomposition products of sulfur hexafluoride electrical equipment
DL/T 1823 On-site detection method of mineral oil, hydrolyzable fluoride and acidity in sulfur hexafluoride gas
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.
3.4
Noise equivalent temperature difference (NETD) noice equivalent temperature difference
An objective evaluation method for the imaging quality of infrared thermal imaging systems. Infrared thermal imaging camera observes a low spatial frequency
For a round or square target, when the signal-to-noise ratio (S/N) of its video signal is 1, the equivalent temperature difference between the target and the background.
4 Testing items, testing cycle and testing methods
The gas detection items, detection cycles and detection methods of mixed gas insulation equipment are shown in Table 1.
5 sampling
5.1 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.
5.2 Laboratory analysis and sampling
Follow the relevant regulations in DL/T 1032.
6 detection
6.1 Gas mixture ratio detection
6.1.1 Sensor method
6.1.1.1 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.
6.1.1.2 Instrument requirements
The sensor method gas mixture ratio detector should meet the following conditions.
a) Detection components. SF6, O2;
b) Sensor type. thermal conductivity or infrared sensor should be used for SF6 detection, and electrochemical sensor should be used for O2 detection;
DL/T 996-2019
c) Detection range. SF6 content (volume fraction) 0~100%, O2 content (volume fraction) 0~1%;
d) Detection error. SF6≤±1% (volume fraction), O2≤±0.1% (volume fraction);
e) Response time. ≤1 min;
f) Temperature control accuracy. ±0.1℃;
g) There should be optional gears such as SF6/CF4 and SF6/N2, which can be used after calibration, and the calibration period should not exceed
1 year.
6.1.1.3 Environmental conditions
a) Temperature. -10℃~40℃;
b) Humidity. ≤85%RH.
6.1.1.4 Test procedure
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 the 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.
6.1.1.5 Test results
Take the arithmetic mean of two parallel determination results as the test result, and the test result is expressed in volume fraction.
6.1.1.6 Precision
The absolute deviation of the two test results is SF6≤1%, O2≤0.1%.
6.1.2 Gas chromatography
6.1.2.1 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.
6.1.2.2 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 2 for typical gas path flow.
b) Carrier gas. helium, with a purity of not less than 99.999%;
c) Standard gas. It should be prepared by a unit authorized by the national metrology department, with a standard substance certificate, and use it within the validity period.
use.
6.1.2.3 Environmental conditions
a) Temperature. -10℃~40℃;
b) Humidity. ≤85%RH.
6.1.2.4 Test procedure
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) The chromatograph is quantified by the external standard method. The calibration 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 supply and all gas sources.
6.1.2.5 Sample chromatogram
Typical chromatograms are shown in Figure 2 and Figure 3.
6.1.2.6.2 Calculate 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
6.1.2.7 Precision
The absolute deviation of the two test results is SF6, N2, CF4≤0.5%, O2≤0.05%.
6.2 Humidity detection
It is advisable to use the condensation dew point method or the resistance-capacitance method for detection. The test method can refer to the measurement method in DL/T 506.
6.3 Detection of decomposition products
Refer to the decomposition product detection method specified in DL/T 1205 to detect the decomposition products of the mixed gas.
6.4 Leak detection
6.4.1 Qualitative leak detection
6.4.1.1 Detection method
The infrared imaging method should be used for mixed gas leak detection. The principle is to use the SF6 gas in the mixed gas to
The long light absorption characteristic is quite different from that of the air, and the infrared images reflected by the two are different, making it invisible to the naked eye when it leaks into the air.
SF6 gas is imaged under infrared detection technology to determine the leak point. Other principles of SF6 gas qualitative leak detection methods can also be used
Leak detection of SF6 mixed gas.
6.4.1.2 Testing environment
a) Temperature. -15℃~35℃;
b) Humidity. ≤85%RH.
6.4.1.3 Apparatus
a) Noise equivalent temperature difference. NETD should be less than 0.05 K (when the ambient temperature is 23±5℃);
b) Detection limit. ≤1 µL/s (calculated as pure SF6);
c) Response time. ≤10 s;
d) Detection distance. The closest detection distance should be ＞50 cm, and the farthest detection distance should be ≥20 m;
e) Viewfinder resolution. ≥320×240 pixels;
f) Continuous working time. > 4 hours.
6.4.1.4 Test procedure
According to the operating requirements of the instrument manual, a gas leak detector is used to perform leak detection on mixed gas insulated equipment.
Determine whether the equipment has a gas leak based on the detection result.
6.4.2 Quantitative leak detection
Perform quantitative leak detection on mixed gas insulated equipment in accordance with 4.2 of GB 11023.
6.5 Acidity test
Detect the acidity of the mixed gas according to the detection method specified in DL/T 916, or according to DL/T 1823
The specified detection method is used to detect the acidity of the mixed gas.
6.6 Detection of hydrolyzable fluoride
Detect the content of hydrolyzable fluoride in the mixed gas according to the detection method specified in DL/T 918, or
According to the detection method specified in DL/T 1823, the content of hydrolyzable fluoride in the mixed gas is detected.
6.7 Detection of mineral oil content
Detect the mineral oil content in the mixed gas according to the detection method specified in DL/T 919, or according to DL/T
The detection method specified in 1823 carries out the detection of the mineral oil content in the mixed gas.
6.8 Biological toxicity test
DL/T 996-2019
According to the detection method specified in DL/T 921, the mixed gas shall be tested for biological toxicity.
6.9 Detection of air content in SF6/CF4
Refer to 6.1.2 to use gas chromatography to detect the air content in SF6/CF4.
6.10 Detection of oxygen content in SF6/N2
Refer to 6.1.2 to use gas chromatography to detect the oxygen content in SF6/N2.
7 Safety precautions
7.1 Strictly implement relevant safety regulations to prevent pressure sudden changes from causing damage to pipelines and testing instruments.
7.2 During the detection process, the pressure changes in the electrical equipment under test should be monitored to prevent equipment alarms caused by low pressure
Or locked.
7.3 During the test, the test site should be ventilated.
7.4 The safety protection of test personnel shall be implemented in accordance with the relevant regulations of DL/T 639.
7.5 The exhaust gas from the test should be recycled and processed.
8 Test report
The test report should include the following.
a) Test date, ambient temperature, atmospheric pressure;
b) The name, model, delivery number, delivery date, mixed gas composition and rated content of the tested equipment;
c) The name, model, factory number, calibration date, etc. of the testing instrument;
d) Test basis;
e) Analysis of operating parameters;
f) Test results;
g) Any abnormal phenomena and explanations observed during testing;
h) Inspection personnel, reviewers, and approval personnel;
i) When testing in a special way, the testing method and calculation method shall be indicated.
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