CN107703077A - For measuring the device and its measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas - Google Patents
For measuring the device and its measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas Download PDFInfo
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- CN107703077A CN107703077A CN201711037254.0A CN201711037254A CN107703077A CN 107703077 A CN107703077 A CN 107703077A CN 201711037254 A CN201711037254 A CN 201711037254A CN 107703077 A CN107703077 A CN 107703077A
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- gas
- laser
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- decomposition gas
- sulfur hexafluoride
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
For measuring the device and its measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas, it is related to photoelectric technology detection technique field.The present invention be in order to solve it is existing be used for measure SF6CO in decomposition gas2The problem of corresponding speed is slow, measurement accuracy is low be present in the device and method of concentration.Control 1910cm‑1Laser sends 1910cm‑1The laser of wave band, the laser are transmitted through in sample cell by the first condenser, 1910cm‑1The laser of wave band is used to absorb SF in sample cell6CO in decomposition gas2Gas, then pass through 1910cm‑1The laser of wave band is delivered on second condenser lens, then is delivered in the entrance slit of spectrometer, and CO is obtained by spectrometer2The spectrum of gas, the CO for storing to obtain by digital lock-in amplifier2The spectrum and atmospheric optical spec of gas, the CO being filled with sample cell is obtained by computer2The concentration of gas.It is used to measure SF6CO in decomposition gas2Concentration.
Description
Technical field
The present invention relates to for measuring SF6CO in decomposition gas2The device and its measuring method of concentration.Belong to photoelectric technology
Detection technique field.
Background technology
SF6It is a kind of excellent megohmite insulant of physico-chemical property, is widely used in power equipment, but when equipment occurs absolutely
Power equipment can be caused damage during edge hidden danger.Heilongjiangdistrict possesses abundant coal and wind energy resources, is that China is important
Energy Base.Unique geographical position and endowment of resources, determine that Heilongjiang power grid is not only to meet local economic society hair
The service type power network of power demand is opened up, while is also the important base and passage that the energy is sent outside.In power network day-to-day operation, if not
The failure situation of power equipment can be found in time, it will huge warp is brought to industrial and agricultural production and daily life
Ji loss.Therefore SF is monitored in real time6Concentration to prevent power equipment infringement and power network safe operation it is significant.
Pure SF6Colourless, nontoxic, tasteless, non-ignitable inert gas, temperature be 150 DEG C and it is following when be not easy with
Other materials chemically react, and catabolite is few during normal operation or does not decompose.Work as SF6In equipment occur insulation hidden danger or
During failure, either locally, corona, spark or arc discharge, will necessarily all energy be caused to discharge, these energy can make SF6
Gas is decomposed reaction, generates H2S、SO2、HF、SOF2、SF4、CO2Etc. a variety of low-fluorine sulfides.SF6Decomposition components can accelerate
The aging of GIS interior insulations and the corrosion of metal material surface, shelf depreciation degree is aggravated, GIS is also resulted in when serious and occurs to dash forward
Hair property insulation fault.
There are a large amount of commercialized SF both at home and abroad at present6Detector, being summed up mainly has 4 kinds of measuring methods：
High-voltage breakdown method, chromatography, ion degree of excursion meter and infrared Absorption spectrometry.
High-voltage breakdown method is mainly according to SF to be measured6The change of breakdown voltage carries out observational measurement, can not quantify and give
Go out SF6Gas concentration, and it is unable to real time on-line monitoring.
Chromatography：Gas chromatography is that a kind of principle using different material different solubility in different phases carries out thing
Manage Analytical Separation.When detected mixed gas flows through chromatographic column, due to solubility, some tested gas is understood
Body dissolve or absorption on a column, with the progress that gas phase flows, be adsorbed onto measured matter in chromatographic column also can again from
Evaporated into chromatographic column in gas phase stream, final two kinds of effects reach balance.The tested gas for flowing through chromatographic column enters detection immediately
Device, detector can will enter its internal tested gas content and be changed into electric signal, obtained electric signal and tested gas
Concentration value is certain proportionate relationship, and the electric signal of acquisition is recorded to form gas chromatogram, and feelings are presented according to gas chromatogram
Condition carries out analysis measurement.Gas chromatography high sensitivity, there is higher reliability, answered in the test of many gas components
With, but due to needing to carry out sampling process during test, during which sample concentration may be caused to change, and then influence test
Precision.Reacted further, since sample gas will flow through the air chamber containing chromatographic column, this causes the analysis time of this method
Increase, the On-line sampling system to testing gas can not be realized.
Chemical reaction method is that the under test gas that sampling obtains is passed through into detection means, and the chemical reagent of itself and inside occurs
Specific chemical reaction.Tested gas component content is analyzed according to some features (such as color or quality) of reaction product.
This method is relevant with the catalytic action of the flow velocity speed and catalyst of manual operation, therefore random error is big, tests in addition
The service life of instrument is only once, it is impossible to and, it is necessary to constantly change, chemical reaction has regular hour process for recycling, because
This its response speed is very slow.
Therefore, it is existing to be used for measuring SF6CO in decomposition gas2The device and method of concentration has that corresponding speed is slow, measurement essence
Spend the problem of low.
The content of the invention
The present invention be in order to solve it is existing be used for measure SF6CO in decomposition gas2Corresponding speed be present in the device and method of concentration
The problem of degree is slow, measurement accuracy is low.Now provide for measure in sulfur hexafluoride decomposition gas the device of gas concentration lwevel and its
Measuring method.
For measuring the device of gas concentration lwevel in sulfur hexafluoride decomposition gas, it includes digital lock-in amplifier 1, swashed
Light device controller 2,1910cm-1Laser 3, the first condenser 4, sample cell 5, second condenser lens 6, spectrometer 7 and computer 8；
Sample cell 5 is used to fill SF6Decomposition gas；
The output signal of digital lock-in amplifier 1 enters laser controller 2, and laser controller 2 is according to the letter received
Number control 1910cm-1Laser 3 sends 1910cm-1The laser of wave band, the laser are transmitted through sample cell 5 by the first condenser 4
In,
1910cm-1The laser of wave band is used to absorb SF in sample cell 56CO in decomposition gas2Gas, absorbed CO2Gas
Body passes through 1910cm-1The laser of wave band is delivered on second condenser lens 6, and the laser is delivered to spectrometer 7 by second condenser lens 6
In entrance slit, CO is obtained by spectrometer 72The spectrum of gas, by the spectral transmissions into digital lock-in amplifier 1, by numeral
Lock-in amplifier 1 stores obtained CO2Atmospheric optical spec during air is filled with the spectrum and sample cell 5 of gas, in removal system
Noise jamming, by two spectral transmissions to computer 8, computer 8 obtains the CO being filled with sample cell 5 using Beer law2
The concentration of gas；
The entrance slit of the spectrometer 7 is located at the focal point of second condenser lens 6.
The measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas, this method are according to for measuring sulfur hexafluoride
The device of gas concentration lwevel realizes that methods described includes in decomposition gas：
Step 1: being filled with air in sample cell 5,1910cm is opened-1Laser 3, the light of air is obtained by spectrometer 7
Compose I0(λ), and the spectral transmissions are stored into digital lock-in amplifier 1；
Step 2: close 1910cm-1Laser 3, SF to be detected is filled with sample cell 56Decomposition gas, then open
1910cm-1Laser 3, SF is obtained by spectrometer 76The spectrum I (λ) of decomposition gas, and by the spectral transmissions to digital servo-control
Stored in amplifier 1；
Step 3: digital lock-in amplifier 1 is by the spectrum I of the air of storage0(λ) and SF6The spectrum I (λ) of decomposition gas is passed
Computer 8 is transported to, computer 8 obtains the CO to be measured being filled with sample cell 5 using Beer law2The concentration N of gas.
Beneficial effects of the present invention are：
The application successively will be filled with air and SF respectively in sample cell6Decomposition gas, controlled with laser controller
1910cm-1Laser sends 1910cm-1The laser of wave band, the spectrum of air is successively obtained and by 1910cm according to spectrometer-1Ripple
The CO of the laser absorption of section2Spectrum, the CO being filled with sample cell is then finally obtained using Beer law2The concentration of gas,
The application measures SF6CO in decomposition gas2The method of gas concentration carries compared to existing metering system measuring speed
It is high more than 5 times, measure CO2The accuracy of gas concentration improves more than 5 times.
Brief description of the drawings
Fig. 1 is the structural representation for measuring the device of gas concentration lwevel in sulfur hexafluoride decomposition gas；
Fig. 2 is the flow chart of the method for gas concentration lwevel in measurement sulfur hexafluoride decomposition gas.
Embodiment
Embodiment one：Illustrate present embodiment referring to Figures 1 and 2, be used to survey described in present embodiment
Measure sulfur hexafluoride decomposition gas in gas concentration lwevel device, it include digital lock-in amplifier 1, laser controller 2,
1910cm-1Laser 3, the first condenser 4, sample cell 5, second condenser lens 6, spectrometer 7 and computer 8；
Sample cell 5 is used to fill SF6Decomposition gas；
The output signal of digital lock-in amplifier 1 enters laser controller 2, and laser controller 2 is according to the letter received
Number control 1910cm-1Laser 3 sends 1910cm-1The laser of wave band, the laser are transmitted through sample cell 5 by the first condenser 4
In,
1910cm-1The laser of wave band is used to absorb SF in sample cell 56CO in decomposition gas2Gas, absorbed CO2Gas
Body passes through 1910cm-1The laser of wave band is delivered on second condenser lens 6, and the laser is delivered to spectrometer 7 by second condenser lens 6
In entrance slit, CO is obtained by spectrometer 72The spectrum of gas, by the spectral transmissions into digital lock-in amplifier 1, by numeral
Lock-in amplifier 1 stores obtained CO2Atmospheric optical spec during air is filled with the spectrum and sample cell 5 of gas, in removal system
Noise jamming, by two spectral transmissions to computer 8, computer 8 obtains the CO being filled with sample cell 5 using Beer law2
The concentration of gas；
The entrance slit of the spectrometer 7 is located at the focal point of second condenser lens 6.
In present embodiment, the entrance slit of the spectrometer 7 is corresponding with the focus of second condenser lens 6, thus can
It is enough to ensure that most strong light is incident to spectrometer 7.
Embodiment two：Present embodiment is that the sulfur hexafluoride that is used to measure described in embodiment one is decomposed
The device of carbon dioxide in gas concentration is described further, and in present embodiment, the first condenser 4 and second condenser lens 6 are equal
For quartz lens.
Embodiment three：Present embodiment is that the sulfur hexafluoride that is used to measure described in embodiment two is decomposed
The device of carbon dioxide in gas concentration is described further, in present embodiment, 1910cm-1The laser warp that laser 3 is sent
After crossing the first condenser 4, the output light of acquisition is directional light.
In present embodiment, due to 1910cm‐1The laser that laser 3 is sent is after the first condenser 4, the output of acquisition
Light is directional light, and therefore, the distance between the first condenser 4 and sample cell 5 can be adjusted suitably, and to testing result without shadow
Ring.
Embodiment four：Present embodiment is that the sulfur hexafluoride that is used to measure described in embodiment one is decomposed
The device of carbon dioxide in gas concentration is described further, and in present embodiment, sample cell 5 is the cylinder knot of both ends sealing
Structure.
In present embodiment, sealing is realized in the both ends of sample cell 5 using light transmissive material.
Embodiment five：Present embodiment is that the sulfur hexafluoride that is used to measure described in embodiment four is decomposed
The device of carbon dioxide in gas concentration is described further, and in present embodiment, the internal diameter of sample cell 5 is 30mm, and length is
40mm。
Embodiment six：The measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas, this method are bases
Realized described in embodiment one for measuring the device of gas concentration lwevel in sulfur hexafluoride decomposition gas, methods described
Including：
Step 1: being filled with air in sample cell 5,1910cm is opened-1Laser 3, the light of air is obtained by spectrometer 7
Compose I0(λ), and the spectral transmissions are stored into digital lock-in amplifier 1；
Step 2: close 1910cm-1Laser 3, SF to be detected is filled with sample cell 56Decomposition gas, then open
1910cm-1Laser 3, SF is obtained by spectrometer 76The spectrum I (λ) of decomposition gas, and by the spectral transmissions to digital servo-control
Stored in amplifier 1；
Step 3: digital lock-in amplifier 1 is by the spectrum I of the air of storage0(λ) and SF6The spectrum I (λ) of decomposition gas is passed
Computer 8 is transported to, computer 8 obtains the CO to be measured being filled with sample cell 5 using Beer law2The concentration N of gas.
Embodiment seven：Gas concentration lwevel in sulfur hexafluoride decomposition gas according to embodiment six
Measuring method, in present embodiment, obtain the CO to be measured being filled with sample cell 52The concentration N of gas formula is：
I (λ)=I0(λ)eσN,
In formula, σ is CO to be measured2Gas is in 1910cm-1Absorption cross-section under laser.
Claims (7)
1. the device for measuring gas concentration lwevel in sulfur hexafluoride decomposition gas, it is characterised in that it includes digital servo-control
Amplifier (1), laser controller (2), 1910cm-1Laser (3), the first condenser (4), sample cell (5), second condenser lens
(6), spectrometer (7) and computer (8)；
Sample cell (5) is used to fill SF6Decomposition gas；
Digital lock-in amplifier (1) output signal enters laser controller (2), and laser controller (2) basis receives
Signal controls 1910cm-1Laser (3) sends 1910cm-1The laser of wave band, the laser are transmitted through by the first condenser (4)
In sample cell (5),
1910cm-1The laser of wave band is used to absorb SF in sample cell (5)6CO in decomposition gas2Gas, absorbed CO2Gas
Pass through 1910cm-1The laser of wave band is delivered on second condenser lens (6), and the laser is delivered to spectrometer by second condenser lens (6)
(7) in entrance slit, CO is obtained by spectrometer (7)2The spectrum of gas, by the spectral transmissions to digital lock-in amplifier (1)
In, obtained CO is stored by digital lock-in amplifier (1)2Atmosphere light during air is filled with the spectrum and sample cell (5) of gas
Compose, the noise jamming in removal system, by two spectral transmissions to computer (8), computer (8) is filled using Beer law
Enter the CO in sample cell (5)2The concentration of gas；
The entrance slit of the spectrometer (7) is located at the focal point of second condenser lens (6).
2. being used for the device for measuring gas concentration lwevel in sulfur hexafluoride decomposition gas according to claim 1, its feature exists
In the first condenser (4) and second condenser lens (6) are quartz lens.
3. being used for the device for measuring gas concentration lwevel in sulfur hexafluoride decomposition gas according to claim 2, its feature exists
In 1910cm-1For the laser that laser (3) is sent after the first condenser (4), the output light of acquisition is directional light.
4. being used for the device for measuring gas concentration lwevel in sulfur hexafluoride decomposition gas according to claim 1, its feature exists
In sample cell (5) is the cylindrical structure of both ends sealing.
5. being used for the device for measuring gas concentration lwevel in sulfur hexafluoride decomposition gas according to claim 4, its feature exists
In the internal diameter of sample cell (5) is 30mm, length 40mm.
6. the measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas, this method is to be used for according to claim 1
Measure the device realization of gas concentration lwevel in sulfur hexafluoride decomposition gas, it is characterised in that methods described includes：
Step 1: being filled with air in sample cell (5), 1910cm is opened-1Laser (3), air is obtained by spectrometer (7)
Spectrum I0(λ), and will be stored in spectral transmissions to digital lock-in amplifier (1)；
Step 2: close 1910cm-1Laser (3), SF to be detected is filled with sample cell (5)6Decomposition gas, then open
1910cm-1Laser (3), SF is obtained by spectrometer (7)6The spectrum I (λ) of decomposition gas, and by the spectral transmissions to numeral
Lock-in amplifier is stored in (1)；
Step 3: digital lock-in amplifier (1) is by the spectrum I of the air of storage0(λ) and SF6Spectrum I (λ) transmission of decomposition gas
To computer (8), computer (8) obtains the CO to be measured being filled with sample cell (5) using Beer law2The concentration N of gas.
7. the measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas according to claim 6, it is characterised in that
Acquisition is filled with the CO to be measured in sample cell (5)2The concentration N of gas formula is：
I (λ)=I0(λ)eσN,
In formula, σ is under test gas CO2In 1910cm-1Absorption cross-section under laser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711037254.0A CN107703077A (en) | 2017-10-30 | 2017-10-30 | For measuring the device and its measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas |
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| CN201711037254.0A CN107703077A (en) | 2017-10-30 | 2017-10-30 | For measuring the device and its measuring method of gas concentration lwevel in sulfur hexafluoride decomposition gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211800A (en) * | 2018-11-14 | 2019-01-15 | 国网黑龙江省电力有限公司电力科学研究院 | Utilize the method for gas concentration lwevel in 632.8nm wave band of laser measurement sulfur hexafluoride gas |
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