CN117169154A - Detection device and detection method for detecting SF6 gas decomposition products based on infrared spectrum - Google Patents
Detection device and detection method for detecting SF6 gas decomposition products based on infrared spectrum Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 86
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 74
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 84
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 13
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- 230000008901 benefit Effects 0.000 abstract description 11
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- 229910018503 SF6 Inorganic materials 0.000 description 58
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 58
- 239000000306 component Substances 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 238000004587 chromatography analysis Methods 0.000 description 3
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- 229910000661 Mercury cadmium telluride Inorganic materials 0.000 description 1
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- 230000032683 aging Effects 0.000 description 1
- MCMSPRNYOJJPIZ-UHFFFAOYSA-N cadmium;mercury;tellurium Chemical compound [Cd]=[Te]=[Hg] MCMSPRNYOJJPIZ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The application discloses a detection device and a detection method for detecting SF6 gas decomposition products based on infrared spectrum, wherein the detection device comprises a sampling device, an infrared optical interference system, a temperature controller, a gas absorption tank, a mechanical pump, an infrared photoelectric detector, an operational amplifier, a filter, an analog-to-digital converter, a computer, a digital-to-analog converter and a digital display, wherein the sampling device is connected with the gas absorption tank, and the infrared optical interference system is arranged at one side of the gas absorption tank; the gas absorption tank is connected with the temperature controller, the mechanical pump and the infrared photoelectric detector, the operational amplifier, the filter, the analog-to-digital converter, the computer, the digital-to-analog converter and the digital display are sequentially connected. The application can rapidly and accurately judge the faults in the GIS by detecting the infrared absorption spectrum of SF6 decomposition products in the GIS system, and has the advantages of good detection stability, high detection sensitivity and low cost compared with the existing detection technology.
Description
Technical Field
The application belongs to the field of gas spectrum analysis, and particularly relates to an infrared spectrum analysis and detection method for SF6 decomposition characteristic products in a GIS system.
Background
Sulfur hexafluoride (SF 6) has excellent chemical stability, thermal stability, insulation and arc extinguishing characteristics, is widely used as an ultrahigh voltage insulating medium material, and is required to accurately detect SF6 decomposed gas in various links of power production. The accurate detection of abnormal gas in electrical equipment such as SF6 electrical equipment is an important basis for carrying out equipment fault diagnosis and state evaluation work. When the inside of the electrical equipment is subjected to insulation faults due to reasons such as design, materials, processes and the like, partial discharge or partial overheating occurs, SF6 gas molecules can be decomposed under high pressure or high temperature conditions to generate a plurality of decomposition products with strong chemical activity, corrosiveness and toxicity, and the safety operation of the electrical equipment and the physical health of maintainers are seriously threatened. These products often contain severe toxicity, can corrode the insulation material, accelerate insulation aging, form more severe overheat faults, and even eventually lead to equipment breakdown. Therefore, accurate detection of SF6 decomposition gas is required in several links of power production in order to discover potential insulation faults and safety hazards in time. The method realizes component identification and concentration measurement of SF6 gas decomposition products, and has important practical significance and long-term social and economic benefits for preventing and diagnosing internal faults of electrical equipment, maintaining normal operation of equipment and field safety production.
The existing on-site SF6 gas decomposition product detection technology mainly adopts an electrochemical sensor method and a chromatographic method, but has certain disadvantages. The electrochemical sensor method has high detection speed, but irreversible attenuation and component test cross interference exist; the environmental impact is large when the dew point instrument on site tests moisture, the environment is limited to 5-35 ℃, and the environment cannot be tested when the temperature is too high or too low; the chromatographic method for testing SF6 has high purity sensitivity, but needs to carry out gas cylinder detection, and has the advantages of heavy instrument, complex operation, long detection time and high gas consumption.
The concentration measurement of SF6 gas decomposition products is one of important methods for fault diagnosis of high-voltage equipment, the laboratory detection of SF6 decomposition gas is mainly gas chromatography at present, but the detection method has long sample injection detection time, the color column separation effect is easily influenced by surrounding environment, the method is not suitable for on-site detection of SF6 and the decomposition gas products thereof, and the method is usually required to be combined with other methods, such as gas chromatography-mass spectrometry and the like. Chinese patent (CN 111398484A, CN113985233A, CN208420814U, etc.) discloses detection of SF6 and decomposition products thereof based on gas chromatography, and although the detection sensitivity is high, an advanced light source and a special circuit are needed, the actual cost is relatively high, and the method is difficult to be widely used in intelligent substations. The gas chromatographic analysis technology has high requirements on the sample injection mode of a sample and the working environment of a chromatographic column, and cannot perform long-time online detection and the like. Therefore, developing equipment with high sensitivity, high detection speed and low cost and capable of realizing on-line detection of SF6 and decomposition products thereof is a pain point facing the industry.
Disclosure of Invention
In order to solve the defects existing in the prior art and solve the industry pain points faced by SF6 and decomposition product detection, the application provides a method for detecting SF6 and decomposition products thereof by infrared spectrum absorption, and the specific infrared spectrum is absorbed by molecular vibration of SF6 and decomposition products thereof, so that the fault of electrical equipment can be rapidly and accurately judged, and the method has the advantages of good detection stability, high detection sensitivity and low cost.
The application adopts the following technical scheme.
The SF6 gas decomposition product detection device based on infrared spectrum detection comprises a sampling device, an infrared optical interference system, a temperature controller, a gas absorption tank, a mechanical pump, an infrared photoelectric detector, an operational amplifier, a filter, an analog-to-digital converter, a computer, a digital-to-analog converter and a digital display, wherein the sampling device is connected with the gas absorption tank, and the infrared optical interference system is arranged at one side of the gas absorption tank; the gas absorption tank is connected with the temperature controller, the mechanical pump and the infrared photoelectric detector, the operational amplifier, the filter, the analog-to-digital converter, the computer, the digital-to-analog converter and the digital display are sequentially connected.
Further, the sampling device comprises a sampling probe, a gas drying and purifying device and a first electromagnetic valve, and the sampling probe, the gas drying and purifying device and the first electromagnetic valve are sequentially connected through a pipeline.
Further, the two ends of the gas absorption tank are respectively provided with a first infrared light collimating lens and a second infrared light collimating lens, and the gas absorption tank is internally provided with a plurality of first infrared total reflection mirrors and two arc-shaped infrared total reflection mirrors, wherein the two arc-shaped infrared total reflection mirrors are respectively embedded at the two ends of the gas absorption tank.
Further, the gas absorption tank is connected with a barometer, and a heating film is surrounded on the outer side of the gas absorption tank.
Further, the infrared optical interference system comprises a third infrared collimating mirror, a second infrared total reflecting mirror, a third infrared total reflecting mirror, an infrared semi-transparent semi-reflecting mirror and a stepping motor, wherein the third infrared collimating mirror and the third infrared total reflecting mirror are respectively arranged at two sides of the infrared semi-transparent semi-reflecting mirror, the second infrared total reflecting mirror and the third infrared total reflecting mirror are mutually perpendicular, the included angles between the infrared semi-transparent semi-reflecting mirror and the second infrared total reflecting mirror and between the infrared semi-transparent semi-reflecting mirror and the third infrared total reflecting mirror are 45 degrees, and the stepping motor is connected with the third infrared total reflecting mirror.
Further, the device also comprises a gas back flushing device and a second electromagnetic valve, and the mechanical pump, the gas back flushing device and the second electromagnetic valve are sequentially connected.
The SF6 gas decomposition product detection method based on infrared spectrum detection specifically comprises the following steps:
step 1: SF6 gas and decomposition products thereof are collected from GIS equipment, and the collected SF6 gas and the decomposition products thereof enter a gas absorption tank;
step 2, regulating the temperature and pressure of the gas absorption tank to be consistent with GIS equipment through a mechanical pump and a temperature controller;
step 3: the infrared light enters a gas absorption tank through an infrared optical interference system, and an infrared light signal is obtained after the infrared light is reflected for multiple times in the gas absorption tank;
step 4: the infrared light signal is converted for multiple times to obtain a corresponding absorption spectrum signal, and the concentration of SF6 gas and decomposition products is obtained by analyzing the obtained absorption spectrum signal.
Further, the step 1 specifically includes:
SF6 and its decomposition characteristic product gas in GIS equipment are collected through the sampling probe, then the gas is purified through the gas drying purification device, the first electromagnetic valve is opened, and SF6 and its decomposition characteristic product gas enter the gas absorption tank.
Further, step 2 specifically includes:
and (3) opening a temperature controller, heating the gas absorption tank through a uniform heating film, regulating and controlling the air extraction speed of the mechanical pump, and enabling the temperature and the pressure of the gas absorption tank to be consistent with the GIS equipment by observing the barometer.
Further, the step 3 specifically includes:
after the gas absorption tank system is stable, an infrared light source is turned on, infrared light passes through a third infrared light collimating lens and enters an infrared light optical interference system, after interference, the infrared light enters the gas absorption tank through a first infrared light collimating lens, the absorption of the gas to the infrared light is enhanced through multiple reflections, then the interference infrared light passes through a second infrared light collimating lens and enters an infrared photoelectric detector, a second electromagnetic valve is turned on, and the SF6 gas and decomposition products thereof after full absorption of the infrared light and detection are recharged into GIS equipment through a mechanical pump.
Further, step 4 specifically includes:
the infrared photoelectric detector converts the interfered infrared light signal into a corresponding electrical signal, then the electrical signal is subjected to operational amplification through the operational amplifier, the background noise is eliminated by using the filter, the electrical signal is converted into a corresponding electrical signal through the analog-to-digital converter, the electrical signal is subjected to Fourier transformation through the computer, and then the electrical signal is converted into a corresponding absorption spectrum signal through the digital-to-analog converter and is displayed in the digital display.
Compared with the prior art, the infrared spectrum detection method has the advantages that the infrared spectrum detection method has long-acting high precision, good selectivity and low consumption, can detect the concentration of SF6 gas and decomposition products thereof in GIS equipment, has strong absorption peaks on infrared bands of components detected by SF6 electrical equipment, utilizes the absorption of SF6 gas and the molecular vibration of the decomposition products thereof to specific infrared light, adopts an infrared spectrum detection system formed by infrared light sources, an infrared optical interference system, an infrared collimating mirror, an infrared total reflecting mirror, an infrared photoelectric detector and other core components, ensures that the concentration detection sensitivity of SF6 gas and the decomposition products is high, the analysis detection speed is high, the equipment is small, the cost is low, the SF6 gas decomposition characteristic products are not leaked in the whole process, the environmental protection is realized, the environmental pollution is effectively reduced, the whole equipment is easy to operate, is easy to install and carry, can be practically applied, and can judge the latent fault type in the GIS equipment by detecting the concentration of the SF6 gas decomposition products, and effectively solves the pain point in industry.
Drawings
FIG. 1 is a schematic illustration of an application of the present application;
FIG. 2 is a schematic diagram of an infrared optical interference system of the present application;
wherein, 1-sampling probe; 2-a gas drying and purifying device; 3-an infrared light source; a 4-infrared optical interference system; 5-a temperature controller; 6-a first solenoid valve; 7-a first infrared light collimating mirror; 8-a first infrared total reflection mirror; 9-heating the film; 10-a gas absorption cell; 11-a mechanical pump; 12-a second solenoid valve; 13-an arc-shaped infrared total reflection mirror; 14-barometer; 15-a second infrared light collimating mirror; 16-infrared photodetectors; 17-an operational amplifier; an 18-filter; a 19-analog-to-digital converter; 20-a computer; a 21-digital-to-analog converter; 22-a digital display; 23-a third infrared light collimating mirror; 24-a second infrared total reflection mirror; 25-a third infrared total reflection mirror; 26-an infrared semi-transparent semi-reflecting mirror; 27-stepper motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are within the scope of the present application.
In the description of the present application, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly stated and limited otherwise, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The application discloses an SF6 gas decomposition product detection device based on infrared spectrum detection, which is shown in figure 1 and comprises a sampling device, an infrared light source 3, an infrared optical interference system 4, a temperature controller 5, a first infrared collimating mirror 7, a first infrared total reflecting mirror 8, a heating film 9, a gas absorption tank 10, a mechanical pump 11, a second electromagnetic valve 12, an arc-shaped infrared total reflecting mirror 13, a barometer 14, a second infrared collimating mirror 15, an infrared photoelectric detector 16, an operational amplifier 17, a filter 18, an analog-to-digital converter 19, a computer 20, a digital-to-analog converter 21, a digital display 22, a third infrared collimating mirror 23, a second infrared total reflecting mirror 24, a third infrared total reflecting mirror 25, an infrared semi-transparent semi-reflecting mirror 26 and a stepping motor 27, wherein components communicated with gas are connected through pipelines.
The sampling device comprises a sampling probe 1, a gas drying and purifying device 2 and a first electromagnetic valve 6, wherein the sampling probe 1, the gas drying and purifying device 2 and the first electromagnetic valve 6 are sequentially connected through pipelines, the first electromagnetic valve 6, a gas absorption tank 10, a mechanical pump 11 and a second electromagnetic valve 12 are sequentially connected through pipelines, and the infrared photoelectric detector 16, an operational amplifier 17, a filter 18, an analog-to-digital converter 19, a computer 20, a digital-to-analog converter 21 and a digital display 22 are sequentially connected.
SF6 and decomposition products thereof are collected from a GIS system through a sampling probe 1, then after purification treatment is carried out through a gas drying and purifying device 2, a first electromagnetic valve 6 is opened, gas enters a gas absorption tank 10, a temperature controller 5 is opened, the gas absorption tank 10 is heated through a uniform heating film 9, the pumping speed of a mechanical pump 11 is regulated and controlled, and the temperature and pressure of the gas absorption tank 10 are consistent with GIS equipment through an observation barometer 14. After the system of the gas absorption tank 10 is stable, SF6 gas and decomposition products thereof are refilled into the GIS equipment. The infrared light source 3 is turned on, infrared light enters the infrared optical interference system 4 through the third infrared light collimating mirror 23, after interference, the infrared light enters the gas absorption tank 10 through the first infrared light collimating mirror 7, after multiple reflection, the absorption of the gas to the infrared light is enhanced, then the interference infrared light enters the infrared photoelectric detector 16 through the second infrared light collimating mirror 15, the interference infrared light signal is converted into a corresponding electrical signal, then operational amplification is carried out, background noise is eliminated through the filter 18, the electrical signal is converted into a corresponding electrical signal through the analog-to-digital converter 19, after Fourier transformation is carried out on the electrical signal through the computer 20, the electrical signal is converted into a corresponding absorption spectrum signal through the digital-to-analog converter 21, and the corresponding absorption spectrum signal is displayed in the numerical display screen 22. The whole detection equipment has the advantages of simple structure, high detection sensitivity and high detection speed, and can realize real-time online analysis and detection.
The structure of the infrared optical interference system 4 for detecting SF6 gas decomposition characteristic products is shown in FIG. 2.
The infrared light source 3 is a halogen tungsten lamp, and the halogen tungsten lamp has the advantages of small volume, high luminous efficiency, stable color temperature, almost no light attenuation, long service life and the like. The infrared light source selects the infrared light emitted by the halogen tungsten lamp at the temperature of 1000-1300K, the temperature of the halogen tungsten lamp is preferably 1200K, the position of the infrared light source 3 corresponds to the position of the infrared light optical interference system 4, and the infrared light emitted by the infrared light source 3 can enter the infrared light optical interference system 4 through the third infrared light collimating mirror 23;
the infrared optical interference system 4 is disposed at one side of the gas absorption tank 10, the infrared optical interference system 4 includes a third infrared collimating mirror 23, a second infrared total reflecting mirror 24, a third infrared total reflecting mirror 25, an infrared semi-transparent semi-reflecting mirror 26 and a stepping motor 27, the third infrared collimating mirror 23 and the third infrared total reflecting mirror 25 are respectively disposed at two sides of the infrared semi-transparent semi-reflecting mirror 26, the second infrared total reflecting mirror 24 corresponds to the position of the infrared outlet after interference, the infrared semi-transparent semi-reflecting mirror 26 is also disposed between the second infrared total reflecting mirror 24 and the infrared outlet after interference, the second infrared total reflecting mirror 24 is fixed in the infrared optical interference system 4, the third infrared total reflecting mirror 25 is driven by the stepping motor 27 and can move horizontally and freely, the stepping motor 27 drives the third infrared total reflecting mirror 25 to move along the direction perpendicular to the third infrared total reflecting mirror 25, the stepping motor 27 is controlled by the computer 20, the infrared semi-transparent semi-reflecting mirror 26 is fixed, the two infrared total reflecting mirrors are strictly perpendicular to each other, and the two infrared total reflecting mirrors 26 and 45 are included angle between the infrared total reflecting mirrors;
compared with other optical interference systems, the infrared optical interference system 4 has the advantages of high scanning speed, high wavelength precision, good resolution, capability of performing multiple scanning in a short time, high light energy utilization rate and high output energy.
Two ends of the gas absorption tank 10 are respectively provided with an infrared light collimating mirror, namely a first infrared light collimating mirror 7 and a second infrared light collimating mirror 15 are respectively arranged at two ends of the gas absorption tank 10, a plurality of first infrared total reflecting mirrors 8 and two arc-shaped infrared total reflecting mirrors 13 are embedded in the gas absorption tank 10, the two arc-shaped infrared total reflecting mirrors 13 are respectively arranged at two ends of the gas absorption tank 10, and the positions of the arc-shaped infrared total reflecting mirrors 13 and the infrared light laser collimating mirrors at the same end of the gas absorption tank 10 are corresponding to each other, so that infrared light can be reflected back and forth in the gas absorption tank 10, and the effective absorption of SF6 gas to infrared light is enhanced, wherein the number of the first infrared total reflecting mirrors 8 is preferably 2-12, and preferably 8;
the gas absorption cell 10 has the advantages of compact structure, strong external disturbance and vibration resistance, high measurement speed, high precision and good accuracy, and the signal-to-noise ratio and the measurement sensitivity of the whole infrared spectrum detection system are higher.
The gas absorption tank 10 is surrounded by a layer of uniform heating film 9, the temperature is controlled by a temperature controller 5, the gas absorption tank 10 is provided with a barometer 14, and the air pressure in the gas absorption tank 10 is detected in real time. Regulating the pressure and temperature of the gas absorption cell 10 by a mechanical pump 11 and a temperature controller 5, wherein the pressure and temperature of the gas absorption cell 10 is consistent with the pressure and temperature of the gas absorption cell 10 in a GIS device in a preferred but non-limiting embodiment;
the infrared photoelectric detector 16 is arranged on the gas absorption tank 10, and the infrared photoelectric detector 16 is a photoelectric detector sensitive to the mid-infrared light of 2.5-25 μm and converts the signal of the interference light into an electric signal, wherein the use of tri-glyceride titanium sulfate or mercury cadmium telluride is preferable;
the analog-digital converter 19 converts the filtered electrical signal into an electrical signal and sends the electrical signal to the computer 20, and the digital-analog converter 21 converts the electrical signal subjected to fourier transformation by the computer 20 into a common absorption spectrum signal;
the SF6 gas and the decomposition products thereof after fully absorbing infrared light and the detected gas are recharged into the GIS equipment by the mechanical pump 11, so that the SF6 gas and the decomposition products thereof are prevented from leaking to the outside.
The application discloses a SF6 gas decomposition product detection method based on infrared spectrum detection, which comprises the following detection processes:
step 1: SF6 gas and decomposition products thereof are collected from GIS equipment, and the collected SF6 gas and the decomposition products thereof enter a gas absorption tank 10; the method specifically comprises the following steps: SF6 gas and decomposition products thereof in GIS equipment are collected through a sampling probe 1, then the gas is purified by a gas drying and purifying device 2, a first electromagnetic valve 6 is opened, and the SF6 gas and decomposition characteristic products thereof enter a gas absorption tank 10;
step 2, regulating and controlling the temperature and pressure of the gas absorption tank 10 to be consistent with GIS equipment through a mechanical pump 11 and a temperature controller 5; the method specifically comprises the following steps: the temperature controller 5 is turned on, the gas absorption tank 10 is heated by the uniform heating film 9, the pumping speed of the mechanical pump 11 is regulated and controlled, the temperature and pressure of the gas absorption tank 10 are consistent with the GIS equipment by observing the barometer 14,
step 3: the infrared light enters the gas absorption tank 10 through the infrared optical interference system 4, and infrared light is reflected for multiple times in the gas absorption tank 10 to obtain an infrared light signal; the method specifically comprises the following steps: after the system of the gas absorption tank 10 is stable, an infrared light source 3 is turned on, infrared light passes through a third infrared light collimating lens 23 and enters an infrared optical interference system 4, after interference, the infrared light passes through a first infrared light collimating lens 7 and enters the gas absorption tank 10, absorption of gas to infrared light is enhanced through multiple reflections, then an infrared light signal obtained after interference passes through a second infrared light collimating lens 15 and enters an infrared photoelectric detector 16, a second electromagnetic valve 12 is turned on, and SF6 gas and decomposition products thereof after full absorption of infrared light and detection are filled back into GIS equipment through a mechanical pump;
step 4: the infrared light signal is converted for a plurality of times to obtain a corresponding absorption spectrum signal, and the concentration of SF6 gas and decomposition products is obtained by analyzing the obtained absorption spectrum signal; the method specifically comprises the following steps: the infrared photoelectric detector 16 converts the interfered infrared light signal into a corresponding electrical signal, then the electrical signal is subjected to operational amplification through the operational amplifier 17, background noise is eliminated by using the filter 18, the electrical signal is converted into a corresponding electrical signal through the analog-digital converter 19, the electrical signal is subjected to Fourier transformation through the computer 20 and then is converted into a corresponding absorption spectrum signal through the digital-analog converter 21, and the digital display 22 analyzes the obtained absorption spectrum signal to obtain and display the concentration of SF6 gas and decomposition products.
The SF6 gas decomposition product detection system based on infrared spectrum detection is used for the SF6 gas decomposition product detection device and the detection method based on infrared spectrum detection, and comprises an infrared spectrum detection system, wherein the infrared spectrum detection system comprises an infrared light source 3, an infrared optical interference system 4, an infrared light collimating mirror, an infrared total reflection mirror and an infrared photoelectric detector 16, so that the SF6 gas decomposition product detection device based on infrared spectrum detection has high sensitivity on concentration detection of SF6 gas and decomposition products, and has high analysis detection speed.
Compared with the prior art, the infrared spectrum detection method has the advantages that the infrared spectrum detection method has long-acting high precision, good selectivity and low consumption, can detect the concentration of SF6 gas and decomposition products thereof in GIS equipment, has strong absorption peaks on infrared spectrum bands of components detected by SF6 electrical equipment, can detect the concentration of SF6 gas and decomposition products thereof in GIS equipment, utilizes the absorption of SF6 gas and decomposition product molecular vibration thereof to specific infrared light, adopts an infrared spectrum detection system formed by core components such as an infrared light source, an infrared optical interference system, an infrared collimating mirror, an infrared total reflection mirror, an infrared photoelectric detector and the like, has high detection sensitivity on the concentration of SF6 gas and decomposition products, has high analysis detection speed, small equipment and low cost, does not leak SF6 gas decomposition characteristic products in the whole process, effectively reduces environmental pollution, is easy to install and carry, can judge the latent fault type in GIS equipment through the detection on the concentration of SF6 gas decomposition products in practice, and effectively solves the problem of the hidden industry.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (12)
1. SF6 gas decomposition product detection device based on infrared spectrum detects, including sampling device, infrared optical interference system (4), temperature controller (5), gas absorption cell (10), mechanical pump (11), infrared photoelectric detector (16), operational amplifier (17), filter (18), analog-to-digital converter (19), computer (20), digital-to-analog converter (21) and digital display (22), its characterized in that: the sampling device is connected with the gas absorption tank (10), and the infrared optical interference system (4) is arranged at one side of the gas absorption tank (10); the gas absorption tank (10) is connected with the temperature controller (5), the mechanical pump (11) and the infrared photoelectric detector (16), the operational amplifier (17), the filter (18), the analog-to-digital converter (19), the computer (20), the digital-to-analog converter (21) and the digital display (22) are sequentially connected.
2. The SF6 gas decomposition product detection apparatus based on infrared spectroscopy detection of claim 1, wherein: the sampling device comprises a sampling probe (1), a gas drying and purifying device (2) and a first electromagnetic valve (6), wherein the sampling probe (1), the gas drying and purifying device (2) and the first electromagnetic valve (6) are sequentially connected through pipelines.
3. The SF6 gas decomposition product detection apparatus based on infrared spectroscopy detection of claim 1, wherein: the two ends of the gas absorption tank (10) are respectively provided with a first infrared light collimating mirror (7) and a second infrared light collimating mirror (15), and the gas absorption tank (10) is internally provided with a plurality of first infrared total reflection mirrors (8) and two arc-shaped infrared total reflection mirrors (13), wherein the two arc-shaped infrared total reflection mirrors (13) are respectively embedded at the two ends of the gas absorption tank (10).
4. The SF6 gas decomposition product detection apparatus based on infrared spectroscopy detection of claim 1, wherein: the gas absorption tank (10) is connected with a barometer (14), and a heating film (9) is surrounded on the outer side of the gas absorption tank (10).
5. The SF6 gas decomposition product detection apparatus based on infrared spectroscopy detection of claim 1, wherein: the infrared optical interference system (4) comprises a third infrared collimating mirror (23), a second infrared total reflecting mirror (24), a third infrared total reflecting mirror (25), an infrared semi-transparent semi-reflecting mirror (26) and a stepping motor (27), wherein the third infrared collimating mirror (23) and the third infrared total reflecting mirror (25) are respectively arranged on two sides of the infrared semi-transparent semi-reflecting mirror (26), the second infrared total reflecting mirror (24) and the third infrared total reflecting mirror (25) are mutually perpendicular, the included angles between the infrared semi-transparent semi-reflecting mirror (26) and the second infrared total reflecting mirror (24) and between the infrared semi-transparent semi-reflecting mirror (25) are 45 degrees, and the stepping motor (27) is connected with the third infrared total reflecting mirror (25).
6. The SF6 gas decomposition product detection apparatus based on infrared spectroscopy detection of claim 1, wherein: the device also comprises a gas back flushing device and a second electromagnetic valve (12), and the mechanical pump (11), the gas back flushing device and the second electromagnetic valve (12) are sequentially connected.
7. The SF6 gas decomposition product detection method based on infrared spectrum detection is characterized by comprising the following steps of:
step 1: SF6 gas and decomposition products thereof are collected from GIS equipment, and the collected SF6 gas and the decomposition products thereof enter a gas absorption tank (10);
step 2, regulating the temperature and pressure of the gas absorption tank (10) to be consistent with GIS equipment through a mechanical pump (11) and a temperature controller (5);
step 3: the infrared light enters a gas absorption tank (10) through an infrared optical interference system (4), and an infrared light signal is obtained after the infrared light is reflected for multiple times in the gas absorption tank (10);
step 4: the infrared light signal is converted for multiple times to obtain a corresponding absorption spectrum signal, and the concentration of SF6 gas and decomposition products is obtained by analyzing the obtained absorption spectrum signal.
8. The method for detecting SF6 gas decomposition products based on infrared spectrum detection of claim 7, wherein step 1 specifically comprises:
SF6 and decomposition characteristic product gas thereof in GIS equipment are collected through a sampling device, and then after the gas is purified by a gas drying and purifying device (2), a first electromagnetic valve (6) connected between the gas drying and purifying device (2) and a gas absorption tank (10) is opened, and SF6 and decomposition characteristic product gas thereof enter the gas absorption tank (10).
9. The method for detecting SF6 gas decomposition products based on infrared spectroscopy according to claim 7, wherein step 2 specifically comprises: and (3) opening a temperature controller (5), heating the gas absorption tank (10) through a uniform heating film (9), regulating and controlling the air extraction speed of the mechanical pump (11), and enabling the temperature and the pressure of the gas absorption tank (10) to be consistent with the GIS equipment by observing the barometer (14).
10. The method for detecting SF6 gas decomposition products based on infrared spectroscopy according to claim 7, wherein step 3 specifically comprises: after the gas absorption tank (10) system is stable, an infrared light source (3) is opened, infrared light passes through a third infrared light collimating mirror (23) and enters an infrared optical interference system (4), after interference, infrared light enters the gas absorption tank (10) through a first infrared light collimating mirror (7), infrared light signals after multiple reflections enter an infrared photoelectric detector (16) through a second infrared light collimating mirror (15), and then a second electromagnetic valve (12) is opened to fully absorb infrared light and SF6 gas after detection and decomposition products of the infrared light are filled back into GIS equipment through a mechanical pump (11).
11. The method for detecting SF6 gas decomposition products based on infrared spectroscopy according to claim 7, wherein step 4 specifically comprises: the infrared photoelectric detector (16) converts the received infrared light signal into a corresponding electrical signal, then the electrical signal is subjected to operational amplification through the operational amplifier (17), background noise is eliminated through the filter (18), the electrical signal is converted into a corresponding electrical signal through the analog-to-digital converter (19), the electrical signal is subjected to Fourier transformation through the computer (20), and then the electrical signal is converted into a corresponding absorption spectrum signal through the digital-to-analog converter (21), and the concentration of SF6 gas and decomposition products obtained through analysis of the absorption spectrum signal is displayed in the digital display (22).
12. An SF6 gas decomposition product detection system based on infrared spectrum detection applied to the device and method for detecting SF6 gas decomposition products based on infrared spectrum detection as claimed in any one of claims 1 to 11, characterized in that: the infrared spectrum detection system comprises an infrared light source (3), an infrared optical interference system (4), an infrared collimating mirror, an infrared total reflecting mirror and an infrared photoelectric detector (16).
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