CN115791002A - Detection method applied to leakage of environment-friendly insulating gas electrical equipment - Google Patents
Detection method applied to leakage of environment-friendly insulating gas electrical equipment Download PDFInfo
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Abstract
The invention relates to the technical field of environment-friendly insulating gas detection, and provides a detection method applied to leakage of environment-friendly insulating gas electrical equipment, which comprises the following steps: selecting a tracer, and preparing a tracer standard gas; (2) Measuring the tracer standard gas by using a time-of-flight mass spectrometer, and establishing a tracer standard working curve; (3) Scanning and measuring an air sample close to the electrical equipment sealing component, and if tracer components are detected, judging that suspicious leakage points exist at the detected part; (4) And carrying out accurate positioning scanning on the suspicious part by using a selective ion continuous monitoring mode. By the technical scheme, the technical problem of leak detection of different types of environment-friendly insulating gas electrical equipment is solved.
Description
Technical Field
The invention relates to the technical field of environment-friendly insulating gas detection, in particular to a detection method applied to leakage of environment-friendly insulating gas electrical equipment.
Background
Sulfur hexafluoride (SF) 6 ) The gas has good insulativity and arc extinguishing performance, is widely applied to power transmission and transformation equipment such as circuit breakers, gas-insulated metal-enclosed switchgear, gas-insulated metal-enclosed transmission lines and the like, but has strong greenhouse effect, and is urgent for searching environment-friendly substitute gas of sulfur hexafluoride and researching and developing environment-friendly electric power equipment. In recent years, SF 6 Breakthrough advances are continually being made in the area of alternative gases, including SF 6 /N 2 Mixed gas containing heptafluoroisobutyronitrile (C) 4 F 7 O), perfluoropentacarbon (C) 5 F 10 O), perfluorohexanone (C) 6 F 12 O), hexafluoroethane (C) 2 F 6 ) Perfluoropropane (C) 3 F 8 ) The application of environment-friendly insulating gas enters a demonstration application stage, and the environment-friendly insulating gas is applied to different types of electric products such as insulated enclosed switchgear (GIS), gas insulated transmission line (GIL), high-voltage switch cabinets and the like. Along with the popularization and application of environment-friendly insulating gas equipment, the corresponding operation and maintenance detection technology is also required to be further improved.
In order to meet the requirements of safe operation and maintenance of environment-friendly insulating gas electrical equipment and solve the defects of the existing leakage detection technology, the invention aims to utilize a time of flight mass spectrum (TOF-MS) detection technology, take environment-friendly insulating gas filled in the electrical equipment as a tracer, detect the concentration of the tracer in ambient air to realize leakage detection of a sealing part of the electrical equipment and solve the technical problem that the existing leakage detection technology cannot cover various gas media.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for detecting leakage of environment-friendly insulating gas electrical equipment, and solves the technical problem that the existing leakage detection technology cannot cover various gas media.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a detection method applied to leakage of environment-friendly insulating gas electrical equipment comprises the following steps:
(1) Selecting a tracer, and preparing a tracer standard gas;
(2) Measuring the tracer standard gas by using a time-of-flight mass spectrometer, and establishing a tracer standard working curve;
(3) Scanning and measuring an air sample close to the electrical equipment sealing component, and if tracer components are detected, judging that suspicious leakage points exist at the detected part;
(4) And carrying out accurate positioning scanning on the suspicious part by using a selective ion continuous monitoring mode.
Further, the tracer in the step (1) is selected from one or more of sulfur hexafluoride, carbon tetrafluoride, hexafluoroethane, perfluoropropane, heptafluoroisobutyronitrile, perfluoropenta-carbon ketone, perfluorohexanone and carbon dioxide;
the selection principle of the tracer is as follows:
1. nitrogen and oxygen which are not present in air in a large amount;
2. selecting one or more of environment-friendly insulating gas components filled in the electrical equipment as a tracer, wherein the content of the tracer in an insulating gas chamber of the electrical equipment is not less than 1% (mol/mol);
3. when selecting carbon dioxide as the tracer, the influence of the background value of carbon dioxide in the air is fully considered.
Further, the time-of-flight mass spectrometer used in the step (2) adopts a vacuum ultraviolet photoionization and photoelectron ionization composite ionization source, and the ionization energy adjustment range is 15 eV-20 eV.
Further, the time-of-flight mass spectrometer used in the step (2) adopts capillary injection; the first port of the capillary tube is in gas connection with a sample to be detected, the second port of the capillary tube is connected to an ionization region of the time-of-flight mass spectrometer through a PEEK joint, and the pressure of the ionization region is controlled to be 0.02 Pa-5 Pa during normal work; and during detection, the sample collection is realized through the pressure difference between the first port and the second port of the capillary tube.
Further, when the standard working curve of the tracer is established in the step (2), the standard curve is established by adopting the characteristic ion peak height or peak area of the selected tracer to calculate the concentration, specifically comprising the following steps: for sulfur hexafluoride/nitrogen mixed gas, the selected characteristic ion mass-to-charge ratio is 127, 89 and 108; selecting a characteristic ion mass-to-charge ratio of 69 and 50 for the mixed gas containing carbon tetrafluoride; selecting a characteristic ion mass-to-charge ratio of 119,69 and 50 for a mixed gas containing hexafluoroethane; selecting the mass-to-charge ratio of characteristic ions of the mixed gas containing perfluoropropane to be 169, 119 and 69; selecting the mass-to-charge ratio of characteristic ions of the mixed gas containing heptafluoroisobutyronitrile to be 176, 145, 195, 100 and 69; selecting the characteristic ion mass-to-charge ratio of 169, 119 and 69 for the mixed gas containing the perfluoropenta-carbon ketone; selecting the mass-to-charge ratio of characteristic ions of 197, 169, 147,119 and 69 for the mixed gas containing perfluorohexanone; for a carbon dioxide containing gas mixture, a characteristic ion mass to charge ratio of 44 was chosen.
Further, the step (3) is to perform scanning measurement on the air sample adjacent to the sealing part of the electrical equipment, and select full scanning or ion continuous monitoring.
Further, in the step (3), when the concentration of the tracer in the sample exceeds 1ppm (mol/mol), the suspicious leakage point around the detected part is judged.
Furthermore, a local wrapping method is selected for detection in the step (3), and the volume of a wrapping space is 100-2000 mL.
Further, in the step (3), sampling and detecting are carried out immediately or at certain intervals after the local binding method is used for binding.
Furthermore, in the step (4), an ion-selective continuous monitoring mode is adopted to perform accurate positioning scanning on the suspicious part, the selected ions are ions with one or more characteristic mass-to-charge ratios of one or more tracer components, and when the monitored ions are found to have obviously enhanced signals during monitoring, the existence of leakage at the detected part is indicated.
The principle and the beneficial effects of the invention are as follows: the method comprises the steps of detecting an air sample near a sealing part of the electrical equipment by using a time of flight mass spectrometry (TOF-MS) detection technology, judging whether suspicious leakage points exist around the detected part according to the content of a tracer, and accurately positioning the leakage points of the equipment by selecting a characteristic ion continuous monitoring method. The method has the advantages of high sensitivity, wide application range, high analysis speed, accurate analysis result and the like, meets the requirements of leak detection tests of various types of environment-friendly insulating gas electrical equipment, and has high popularization and application values.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method of detecting leakage in an environmentally friendly insulating gas electrical apparatus in accordance with the present invention;
FIG. 2 is a time-of-flight mass spectrum of two perfluorohexanone standard gases at concentrations of 0ppm and 1.1ppm in example 1 of the present invention;
FIG. 3 is a diagram of peak intensity analysis of characteristic mass-to-charge ratios 197,147,119,69 ions in a full scan spectrum of a series of perfluorohexanone standard gas; FIG. 4 is a plot of the ion peak area of a series of perfluorohexanone standard gas m/Z-197 ion peak area fitted to a concentration standard;
FIG. 5 is a TCD chromatogram of a sample obtained in example 2 of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with reference to specific embodiments, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure herein. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
Example 1
(1) Preparing a cyclic fluorohexanone standard working gas. In a laboratory with the temperature controlled at 20 ℃, high-purity perfluorohexanone liquid and dry air are used for preparing standard working gas. Accurately collecting 100mL of dry air with 1 100mL syringe, sealing with rubber cap, injecting 5.0 μ L of cyclohexenone liquid with microinjector, standing in 50 deg.C temperature control box for 30min, and cooling to room temperature. The perfluorohexanone reagent used has a purity higher than 99% and a density of 1.60kg/L (20 ℃). The content (mol/mol) of cyclic fluorohexanones in the gas produced was calculated as follows:
wherein c is the concentration of the standard working gas of the cyclic fluorohexanone, and the unit is ppm (mol/mol); v. of 1 Is the injected perfluorohexanone liquid volume, L; rho is the density of the perfluorohexanone liquid at 20 ℃, kg/L; m is perfluorohexanone molar mass, 316g/mol; v is the volume of gas after dilution, L.
(2) Preparing a cyclic fluorohexanone series standard. Measuring 0.2mL of the prepared standard working gas in the step (1) by using a 1mL syringe, injecting the standard working gas into the syringe which is measured in advance to obtain about 50mL of dry air, continuing to inject the dry air to 100mL to obtain the standard gas with the content of 11.3ppm, and respectively diluting the standard gas with the concentration by 10 times and 2 times by using the dry air to obtain the perfluorohexanone standard gas with the content of 1.1ppm and 5.7 ppm; measuring 0.2mL, 0.4mL, 0.5mL and 0.8mL of the standard working gas prepared in the step (1) by using a 1mL syringe respectively, injecting the standard working gas into the syringe which is measured in advance to be about 50mL of dry air, and continuously injecting the dry air to 100mL to obtain series of standard gases with the contents of 11.3ppm, 22.7ppm, 28.4ppmp and 45.4ppm respectively.
(3) Testing a series of cyclohexanone-fluorine standard gases by using a time-of-flight mass spectrometer, recording a full-scanning mass spectrum of the standard gases, selecting the testing time as 100s, and obtaining a graphThe spectra are full scans superimposed by 100 plots, and the specific test conditions of the time-of-flight mass spectrometer are: ionization region circular hole electrode 1 voltage: +22V; ionization region circular hole electrode 2 voltage: +20V; air pressure in an ionization region: 0.3Pa; mass analyzer gas pressure: 5X 10 -5 Pa; electrode voltage of the skimmer: +3V; ion lens 1 voltage: -40V; ion lens 2 voltage: -120V; ion lens 3 voltage: -40V; ion lens 4 voltage: -10V; ion lens 5 voltage: 0V; positive high-voltage repulsion electrode voltage: +400V; negative high-voltage repulsion electrode voltage: -380V; accelerator voltage: 2500V; voltage of reflective electrode 1: 348V; voltage of reflective electrode 2: 420V; MCP detector voltage: 2700V.
(4) And (3) spectrum data processing, namely filtering and smoothing the test spectrum of the perfluorohexanone series standard gas, selecting 4 characteristic peaks with mass-to-charge ratios of 197,147,119 and 69 for analysis, respectively recording peak height and peak area parameters, drawing a standard gas peak height, a peak area-concentration scatter diagram and performing linear fitting to obtain standard working curves of perfluorohexanone and characteristic ion signals with different concentrations. The method comprises the following specific steps:
the standard curve fitting result of the characteristic peak area of m/Z197 is as follows: y =1.80145x-0.23285 (R = 0.99956)
The fitting result of the standard curve with the characteristic peak height of m/Z197 is as follows: y =8.6127x +8.00872 (R = 0.99882)
The standard curve fitting result of the m/Z147 characteristic peak area is as follows: y =0.98624x-0.48507 (R = 0.99815)
The standard curve fitting result of the peak height of the m/Z147 characteristic peak is as follows: y =6.34726x-0.59772 (R = 0.99603)
The standard curve fitting result of the characteristic peak area of m/Z119 is as follows: y =1.9653x-1.24433 (R = 0.99707)
The fitting result of the standard curve with the characteristic peak height of m/Z119 is as follows: y =16.10223x-9.19514 (R = 0.99662)
The standard curve fitting result of the characteristic peak area of m/Z69 is as follows: y =1.56245x-0.39639 (R = 0.99792)
The standard curve fitting result of the peak height of the m/Z69 characteristic peak is as follows: y =19.81594x-5.27943 (R = 0.9995)
FIG. 2 is a time-of-flight mass spectrum of two standard gases with concentration of 0,1.1ppm, FIG. 3 is a peak intensity analysis diagram of characteristic mass-to-charge ratios 197,147,119,69 of a series of standard gases, and FIG. 4 is a fitting diagram of ion peak area m/Z-197 and a standard curve of perfluorohexanone concentration.
Example 2
(1) Introducing CO 2 Steel cylinder standard gas (concentration is 20.0%, balance gas is N) 2 ) After being reduced by a pressure reducing valve, the sulfur hexafluoride infrared imaging leak detector is connected with the air inlet end of a sulfur hexafluoride infrared imaging leak detector calibration system (model TP 5000L, produced by Beijing Taipu combined science and technology development Co., ltd.), the pressure of a leakage cavity is adjusted to be 0.1MPa, and the gas leakage rate is set to be 100 multiplied by 10 on the instrument -3 mL/min, starting a gas release function key, and randomly selecting one of the 3 leakage holes by the calibration system to leak gas at a set rate.
(2) The specific parameter settings of the time-of-flight mass spectrometer are the same as those in example 1, the first port of the capillary used is placed in the environment, the characteristic ion with the mass-to-charge ratio of 44 (mass-to-charge ratio range of 43.5-44.5) is selected, and the instrument is started to monitor CO in the background air 2 And (3) characteristic ion signals, after the characteristic ion signals are stabilized, slowly moving the first port of the capillary near 3 leakage holes of the calibration system, continuously monitoring the sample by the time-of-flight mass spectrometer, and recording a map. The test result is shown in fig. 5, in the 4 monitoring processes of the sample near the leakage hole No. 3, the characteristic ion signal is obviously enhanced, the monitoring signals of the leakage hole No. 1 and the leakage hole No. 2 are basically consistent with the environmental background value, and the leakage part is judged to be the leakage hole No. 3.
(3) After stopping gas leakage, the calibration system of the sulfur hexafluoride infrared imaging leak detector immediately displays that the leakage part is a No. 3 leakage hole, and the result is consistent with the test conclusion.
Example 3
(1) Mixing SF 6 Steel cylinder standard gas (concentration 1.0%, balance gas N) 2 ) After being reduced by a pressure reducing valve, the sulfur hexafluoride infrared imaging leak detector is connected with the air inlet end of a sulfur hexafluoride infrared imaging leak detector calibration system (model TP 5000L, produced by Beijing Taipu combined science and technology development Co., ltd.), the pressure of a leakage cavity is adjusted to be 0.1MPa, and the gas leakage rate is set to be 100 multiplied by 10 on the instrument -3 mL/min, start gasAnd (4) releasing a function key, wherein the calibration system randomly selects one of the 3 leakage holes and leaks gas at a set rate.
(2) The specific parameter setting of the time-of-flight mass spectrometer is the same as that in embodiment 1, the first port of the capillary is placed in the environment, characteristic ions with mass-to-charge ratios of 127, 89 and 108 are selected, the second port of the capillary is connected to an ionization region of the time-of-flight mass spectrometer through a PEEK joint, a Pirani vacuum gauge is installed in an ionization cavity and used for measuring the pressure of the ionization cavity, the pressure of the ionization region is controlled to be 0.2 Pa-0.5 Pa when the instrument works normally, the first port of the capillary is slowly moved near 3 leakage holes of a calibration system, and the time-of-flight mass spectrometer continuously monitors a sample and records a map. In the 4 monitoring processes of samples near the No. 1 leakage hole, the characteristic ion signals are obviously enhanced, the monitoring signals of the No. 2 and No. 3 leakage holes are basically consistent with the environmental background value, and the leakage part is judged to be the No. 1 leakage hole.
(3) After stopping gas leakage, the calibration system of the sulfur hexafluoride infrared imaging leak detector immediately displays that the leakage part is a No. 1 leakage hole and is consistent with a test conclusion.
Example 4
(1) CF is 4 Steel cylinder standard gas (concentration 1.0%, balance gas N) 2 ) After being reduced by a pressure reducing valve, the sulfur hexafluoride is connected with the air inlet end of a sulfur hexafluoride infrared imaging leak detector calibration system (model TP 5000L, manufactured by Beijing Taipu combined science and technology development Co., ltd.), the pressure of a leakage cavity is adjusted to be 0.1MPa, and the gas leakage rate is set to be 100 multiplied by 10 on the instrument -3 mL/min, starting a gas release function key, and randomly selecting one of the 3 leakage holes by the calibration system to leak gas at a set rate.
(2) The specific parameter setting of the time-of-flight mass spectrometer is the same as that in embodiment 1, the first port of the capillary is placed in the environment, characteristic ions with the mass-to-charge ratio of 69 and 50 are selected, the second port of the capillary is connected to an ionization region of the time-of-flight mass spectrometer through a PEEK joint, a Pirani vacuum gauge is installed in an ionization cavity and used for measuring the pressure of the ionization cavity, the pressure of the ionization region is controlled to be 0.2 Pa-0.5 Pa when the instrument works normally, the first port of the capillary is slowly moved near 3 leakage holes of a calibration system, and the time-of-flight mass spectrometer continuously monitors a sample and records a map. In the 4 monitoring processes of samples near the No. 2 leakage hole, the characteristic ion signals are obviously enhanced, the monitoring signals of the No. 1 leakage hole and the No. 3 leakage hole are basically consistent with the environmental background value, and the leakage part is judged to be the No. 2 leakage hole.
(3) After stopping gas leakage, the calibration system of the sulfur hexafluoride infrared imaging leak detector immediately displays that the leakage part is a No. 2 leakage hole, and the result is consistent with the test conclusion.
Example 5
(1) Will C 2 F 6 Steel cylinder standard gas (concentration 1.0%, balance gas N) 2 ) After being reduced by a pressure reducing valve, the sulfur hexafluoride is connected with the air inlet end of a sulfur hexafluoride infrared imaging leak detector calibration system (model TP 5000L, manufactured by Beijing Taipu combined science and technology development Co., ltd.), the pressure of a leakage cavity is adjusted to be 0.1MPa, and the gas leakage rate is set to be 100 multiplied by 10 on the instrument -3 mL/min, starting a gas release function key, and randomly selecting one of the 3 leakage holes by the calibration system to leak gas at a set rate.
(2) The specific parameter setting of the time-of-flight mass spectrometer is the same as that in embodiment 1, the first port of the capillary is placed in the environment, characteristic ions with mass-to-charge ratios of 119,69 and 50 are selected, the second port of the capillary is connected to an ionization region of the time-of-flight mass spectrometer through a PEEK joint, a Pirani vacuum gauge is installed in an ionization cavity and used for measuring the pressure of the ionization cavity, the pressure of the ionization region is controlled to be 0.2 Pa-0.5 Pa when the instrument works normally, the first port of the capillary is slowly moved near 3 leakage holes of a calibration system, and the time-of-flight mass spectrometer continuously monitors a sample and records a map. In the 4 monitoring processes of samples near the No. 3 leakage hole, the characteristic ion signals are obviously enhanced, the monitoring signals of the No. 1 leakage hole and the No. 2 leakage hole are basically consistent with the environmental background value, and the leakage part is judged to be the No. 3 leakage hole.
(3) After stopping gas leakage, the calibration system of the sulfur hexafluoride infrared imaging leak detector immediately displays that the leakage part is a No. 3 leakage hole, and the result is consistent with the test conclusion.
Example 6
(1) C is to be 4 F 7 O steel cylinder standard gas (concentration is 10.0%, balance gas is CO) 2 ) After being reduced by a pressure reducing valve, the sulfur hexafluoride infrared imaging leak detector is connected with the air inlet end of a sulfur hexafluoride infrared imaging leak detector calibration system (model TP 5000L, produced by Beijing Taipu combined science and technology development Co., ltd.), the pressure of a leakage cavity is adjusted to be 0.1MPa, and the gas leakage rate is set to be 100 multiplied by 10 on the instrument -3 mL/min, starting a gas release function key, and randomly selecting one of the 3 leakage holes by the calibration system to leak gas at a set rate.
(2) The specific parameter setting of the time-of-flight mass spectrometer is the same as that in embodiment 1, a first port of a capillary tube is placed in the environment, characteristic ions with mass-to-charge ratios of 176, 145, 195, 100, 69 and 44 are selected, a second port of the capillary tube is connected to an ionization region of the time-of-flight mass spectrometer through a PEEK joint, a pirani vacuum gauge is installed in an ionization cavity and used for measuring the pressure of the ionization chamber, the pressure of the ionization region is controlled to be 0.2 Pa-0.5 Pa when the instrument works normally, the first port of the capillary tube is slowly moved near 3 leakage holes of a calibration system, and the time-of-flight mass spectrometer continuously monitors a sample and records a map. In the 4 monitoring processes of samples near the No. 1 leakage hole, the characteristic ion signals are obviously enhanced, the monitoring signals of the No. 2 and No. 3 leakage holes are basically consistent with the environmental background value, and the leakage part is judged to be the No. 1 leakage hole.
(3) After stopping gas leakage, the calibration system of the sulfur hexafluoride infrared imaging leak detector immediately displays that the leakage part is a No. 1 leakage hole, and the result is consistent with the test conclusion.
Although the invention has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A detection method applied to leakage of environment-friendly insulating gas electrical equipment is characterized by comprising the following steps:
(1) Selecting a tracer, and preparing a tracer standard gas;
(2) Measuring the tracer standard gas by using a time-of-flight mass spectrometer, and establishing a tracer standard working curve;
(3) Scanning and measuring an air sample close to the electrical equipment sealing component, and if a tracer component is detected, judging that a suspicious leakage point exists at the detected part;
(4) And carrying out accurate positioning scanning on the suspicious part by using a selective ion continuous monitoring mode.
2. The method for detecting the leakage of the environmentally friendly insulating gas electrical equipment as claimed in claim 1, wherein the tracer in the step (1) is selected from one or more of sulfur hexafluoride, carbon tetrafluoride, hexafluoroethane, perfluoropropane, heptafluoroisobutyronitrile, perfluoropenta-carbon ketone, perfluorohexanone and carbon dioxide;
the selection principle of the tracer is as follows:
1. nitrogen and oxygen which are not present in air in a large amount;
2. selecting one or more of environment-friendly insulating gas components filled in the electrical equipment as a tracer, wherein the content of the tracer in an insulating gas chamber of the electrical equipment is not less than 1% (mol/mol);
3. when selecting carbon dioxide as the tracer, the influence of the background value of carbon dioxide in the air is fully considered.
3. The method for detecting the leakage of the environment-friendly insulating gas electrical equipment as claimed in claim 1, wherein the time-of-flight mass spectrometer used in the step (2) adopts a vacuum ultraviolet photoionization and photoelectronic ionization composite ionization source, and the ionization energy adjustment range is 15eV to 20eV.
4. The method for detecting the leakage of the environment-friendly insulating gas electrical equipment, according to claim 1, wherein the time-of-flight mass spectrometer used in the step (2) adopts capillary tube injection; the first port of the capillary tube is connected with a sample to be detected, the second port of the capillary tube is connected to an ionization region of a time-of-flight mass spectrometer through a PEEK joint, and the pressure of the ionization region is controlled to be 0.02Pa to 5Pa during normal work; and during detection, the sample collection is realized through the pressure difference between the first port and the second port of the capillary tube.
5. The method for detecting leakage of an environment-friendly insulating gas electrical device according to claim 1, wherein when a standard working curve of the tracer is established in the step (2), a standard curve is established by using a characteristic ion peak height or a peak area of the selected tracer to calculate the concentration, specifically: for sulfur hexafluoride/nitrogen mixed gas, the selected characteristic ion mass-to-charge ratios are 127, 89 and 108; selecting a characteristic ion mass-to-charge ratio of 69 and 50 for the mixed gas containing carbon tetrafluoride; selecting a characteristic ion mass-to-charge ratio of 119,69 and 50 for a mixed gas containing hexafluoroethane; selecting the mass-to-charge ratio of characteristic ions of the mixed gas containing perfluoropropane to be 169, 119 and 69; selecting the mass-to-charge ratio of characteristic ions of the mixed gas containing heptafluoroisobutyronitrile to be 176, 145, 195, 100 and 69; selecting the characteristic ion mass-to-charge ratio of 169, 119 and 69 for the mixed gas containing the perfluoro-penta-carbon ketone; selecting the mass-to-charge ratio of characteristic ions of 197, 169, 147,119 and 69 for the mixed gas containing perfluorohexanone; for a carbon dioxide containing gas mixture, a characteristic ion mass to charge ratio of 44 was chosen.
6. The method for detecting the leakage of the environmentally friendly insulating gas electrical equipment, according to claim 1, wherein the step (3) is to perform scanning measurement on the air sample adjacent to the sealing part of the electrical equipment, and select full scanning or ion continuous monitoring.
7. The method according to claim 1, wherein in step (3), when the concentration of the tracer in the sample exceeds 1ppm (mol/mol), a suspected leakage point around the detected part is determined.
8. The method for detecting the leakage of the environment-friendly insulating gas electrical equipment as claimed in claim 1, wherein the detection in the step (3) is performed by adopting a local binding method, and the volume of a binding space is 100mL to 2000mL.
9. The method for detecting the leakage of the environment-friendly insulating gas electrical equipment as claimed in claim 8, wherein the local bundling in the step (3) is immediately or at certain time intervals for sampling and detecting.
10. The method according to claim 1, wherein the step (4) is performed by performing a precise location scan on the suspected region using a continuous monitoring mode of selected ions, wherein the selected ions are ions with one or more characteristic mass-to-charge ratios of one or more tracer components, and when the monitored ion signal is significantly enhanced during monitoring, it is indicated that there is a leak at the detected region.
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| CN116878741A (en) * | 2023-09-06 | 2023-10-13 | 江苏炎启自动化有限公司 | Detection device for GIS indoor gas leakage and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116878741A (en) * | 2023-09-06 | 2023-10-13 | 江苏炎启自动化有限公司 | Detection device for GIS indoor gas leakage and application method thereof |
| CN116878741B (en) * | 2023-09-06 | 2023-12-01 | 江苏炎启自动化有限公司 | Detection device for GIS indoor gas leakage and application method thereof |
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