CN103017991A - Suction type SF6 gas leakage monitoring device and method - Google Patents
Suction type SF6 gas leakage monitoring device and method Download PDFInfo
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- CN103017991A CN103017991A CN2012104866038A CN201210486603A CN103017991A CN 103017991 A CN103017991 A CN 103017991A CN 2012104866038 A CN2012104866038 A CN 2012104866038A CN 201210486603 A CN201210486603 A CN 201210486603A CN 103017991 A CN103017991 A CN 103017991A
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Abstract
The invention provides a suction type SF6 gas leakage monitoring device and method. The device comprises an air outlet (1), an air inlet (2), an infrared light supply (3), a window piece I (4), a window piece II (5), a reference spectral filter (6), a measuring spectral filter (7), a dual channel infrared detector (8), a temperature probe(9), a signal conditioning module (10), an A/D (Analog/Digital) conversion module (11), a data processing module (12), a light source driving module (13), a device body (14), an end cover I (15) and an end cover II (16). The invention provides the suction type SF6 gas leakage monitoring device and method have the advantages that the suction type SF6 gas leakage monitoring device has a digital output and thermal compensation function and is simple and reliable, and the sensitivity is high. The method and the device can carry out ration monitoring on SF6 leaking so as to externally output a high-precision SF6 leaking concentration value, and the method and the device have the advantages that the monitoring accuracy is high, the method and the device are stable and reliable, the structure is compact, the volume is small and exquisite and the like.
Description
Technical field
The invention belongs to SF6 Leakage Gas monitoring field, be specifically related to adopt dual wavelength infrared monitoring principle, carry temperature compensation, have high precision suction-type SF6 Leakage Gas monitoring method and device that digital signal is exported.
Background technology
In electric system, SF6 gas has fabulous insulating property and arc extinction performance because of it, obtains to use widely.But because SF6 is heavier than air, in case leak, easily be deposited on bottom, power switch chamber, cause human body anoxia when personnel enter.And SF6 is under high temperature or arcing, or when running into moisture, can resolve into multiple noxious material.So explicitly call for SF6 equipment and place in " State Grid Corporation of China's electric power safety working regulation ", need regularly monitor and check, and normal concentration 1000ppm is the Security alert value that surpassing this concentration will threaten to people's life.
The negative corona discharge detection method is that the SF6 Leakage Gas detects one of method commonly used, and the method is utilized the electric arc blocking characteristics of SF6 gas by using the high-voltage breakdown technology, detects its aerial content.But because SF6 gas is strong insulating gas, concentration surpasses certain value namely can stop discharge fully, causes larger measuring error.In addition, if long-time use causes probe aging easily, shorten the serviceable life of sensor, and can produce zero point drift, the reliability of measurement is difficult to guarantee.
Along with the development of infrared detection technique, the incomparable advantage of conventional art that infrared SF6 leakage monitoring technology has on volume, power consumption, performance, price makes its application increasingly extensive.American Electric Power research institute at first is applied to infrared detection technique the monitoring of the SF6 of transformer station Leakage Gas, and domestic application is the simple application of this technology in technology and the device of SF6 leakage monitoring at present, has following deficiency:
1) generally adopting half-band width is that the interference filter of 250nm is as measuring optical filter, because half-band width is wider, so that the monitoring accuracy of relevant SF6 leakage monitoring system is lower;
2) output signal mostly is simulating signal, is realizing the function aspects Shortcomings such as digital output, temperature compensation, elimination light source and such environmental effects, and usable range is greatly limited.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of employing dual wavelength infrared monitoring principle, with numeral output, temperature compensation function, simple and reliable, highly sensitive suction-type SF6 Leakage Gas monitoring method and device.The method and device can to SF6 leak carry out Quantitative Monitoring and externally output high precision SF6 leak concentration value, have the advantages such as monitoring accuracy height, reliable and stable, compact conformation, volume be small and exquisite.
The technical solution used in the present invention is: a kind of suction-type SF6 Leakage Gas monitoring device, this device comprise gas outlet, air intake opening, infrared light supply, diaphragm one, diaphragm two, reference optical filter, measure optical filter, binary channels infrared eye, hygrosensor, signal condition module, A/D modular converter, data processing module, light source driver module, device body, end cap one and end cap two; The device body of inner hollow forms an air chamber, the gold-plated reflectance coating of air chamber inwall, set out gas port and air intake opening on it, diaphragm one and diaphragm two are equipped with in the device body two ends, make air chamber sealing and do not hinder the infrared light transmission, be provided with hygrosensor among the air chamber, the left side of diaphragm one is provided with infrared light supply, fixing and link to each other with device body by end cap one, the right side of diaphragm two is provided with the binary channels infrared eye, two passage fronts of binary channels infrared eye are equipped with respectively the reference optical filter and are measured optical filter, thereby so that the binary channels infrared eye can be exported a reference signal and a measuring-signal, by the fixing binary channels infrared eye and be connected as a single entity with device body of end cap two, described reference optical filter and measurement optical filter for the monitoring of SF6 Leakage Gas is super spike interference filter, be provided with circuit board in end cap two outsides, circuit board is fixed on the end cap two.
Wherein, comprise the signal condition module on the circuit board, the A/D modular converter, data processing module and light source driver module, the signal condition module is to reference signal and measuring-signal amplifies and filtering, the A/D modular converter converts analog electrical signal to digital signal that data processing module can receive, and data processing module calculates the concentration of tested gas according to the digital signal that receives and this concentration is externally exported, and light source driver module drives infrared light supply and sends stable infrared light.
Wherein, the centre wavelength of reference optical filter is 3.95 μ m ± 40nmm, and half-band width is 90nm ± 20nm, and the centre wavelength of measuring optical filter is 10.55 μ m ± 80nm, and half-band width is 90nm ± 20nm.
Theoretical according to infrared spectrum, asymmetric polarity molecule produces absorption owing to the rotation of internal dipole square, vibration etc. to the infrared light that passes gas molecule.Dissimilar gas molecule dipole moment is different, so that a kind of gas molecule has obvious absorption to the infrared light of specific wavelength.According to Lambert-Beer's law: I=I
0Exp (μ CL); Wherein I is output intensity, I
0Be incident intensity, C is gas concentration, and L is absorption length, and μ is the absorption coefficient of gas, can be rewritten as:
From above formula as can be known, when the absorption coefficient μ of absorption length L and gas is known, can be by measuring I and I
0Radiometer calculate the concentration of tested gas, I and I
0Ratio be called transmittance
In the practical application, because infrared light is easy to be subjected to many factors (such as temperature, mains fluctuations, light source ages etc.) impact, only can not be enough to the leakage of monitor gas by the decay of single light beam transmitted light intensity.Dual wavelength infrared monitoring principle increases a reference wavelength on the basis of single wavelength infrared monitoring, namely select tested gas that the wavelength at the strongest absorption peak place of infrared Absorption is the measurement wavelength, be reference wavelength and select another all gas to its wavelength that does not have receptivity, use electronic circuit corresponding to binary channels infrared eye, two optical filter and processing dual wavelength signal and algorithm to realize monitoring to Leakage Gas.Measure optical filter and the wavelength that the selection of reference optical filter sees through by one, after seeing through two optical filters, the variation of the infrared absorption energy of respective wavelength is reflected on the binary channels infrared eye, after processing and calculate by corresponding signal, determines existence and the concentration information of tested gas.When not having tested gas composition in the air chamber, what the binary channels infrared eye received is unabsorbed infrared light, and measuring-signal and reference signal equate; When having tested gas composition in the air chamber, the energy of measuring beam is absorbed, and the measuring-signal that detects is less than the signal of reference beam.If seeing through the light intensity of measuring passage when not passing into SF6 gas is I
0, the light intensity of reference channel is I '
0Passing into the light intensity of measuring passage behind the finite concentration SF6 gas is I, and the reference channel light intensity is I '; Transmittance T=I ' then
0I/I
0I '.Gas controlling device to determining has definite I
0And I '
0Value, as long as record I and I ' during monitoring, after processing by the signal of Circuits System, just can obtain the concentration information of tested SF6 gas.This reference is processed can eliminate effectively that flashing is fixed, the zero point drift of photoelectric device etc. is on the impact of measuring accuracy, so that the dual wavelength infrared monitoring has higher measuring accuracy.
According to above analysis, the present invention provides a kind of suction-type SF6 Leakage Gas the method for monitoring in addition, adopt above-mentioned suction-type SF6 Leakage Gas monitoring device, connect the gas outlet by vacuum pump, impel tested gas leakage by the air intake opening air inlet chamber that continues to flow, connect after the external power source, light source driver module drives infrared light supply and sends infrared light, through entering the gas absorption in the air chamber, arrive the binary channels infrared eye through reference optical filter and measurement optical filter again, two passages of binary channels infrared eye produce respectively the reference signal and the measuring-signal that comprises tested gas concentration information that comprise light source and environmental information, these two signals are by the amplification of signal condition module, filtering and A/D modular converter convert to after the digital signal, be input to data processing module, data processing module is removed the impact of light source and environment by Data Processing Platoon, obtain the concentration of tested leakage SF6 gas according to the concentration computation model that writes in advance, meanwhile, the temperature of the tested leakage SF6 gas that hygrosensor also will detect is input to data processing module, data processing module carries out the temperature correction to tested leakage SF6 gas concentration again, thereby obtain real tested leakage SF6 gas concentration, this SF6 concentration is externally exported.
Wherein, when data are processed in the described data processing module for the characteristic of leaking SF6 gas, adopt the multi-point calibration method, set up and leak SF6 gas concentration computation model, timing signal is selected a plurality of concentration point, the preparation normal mixture in leaking SF6 monitoring range ability, obtain the variables D of an air inclusion concentration information to eliminate the impact of light source, according to D value and normal concentration X according to measuring voltage and reference voltage
0Corresponding relation between the value is set up and is leaked SF6 gas concentration computation model, the temperature information of this model and timing signal is write in the single-chip microcomputer storer in the lump, during actual monitoring, data processing module receives measuring voltage, three numerical value of reference voltage and temperature, calculate first and leak SF6 gas concentration information variable D, to get rid of light source fluctuation and the environmental impact that may exist, calculate corresponding concentration value according to the leakage SF6 gas concentration computation model that writes in advance again, then carry out temperature compensation according to temperature, leakage SF6 gas concentration after being compensated, this concentration are the actual concentration value of tested leakage SF6 gas.
The present invention's advantage compared with prior art is:
The present invention adopts dual wavelength infrared monitoring principle, is a kind of efficient, safe SF6 leakage monitoring technology, has the advantages such as monitoring accuracy height, good stability, reliability height, life-span length.The gold-plated reflectance coating of air chamber inwall, select super spike interference filter as measuring optical filter, can effectively improve the measuring accuracy of device.Circuit part is integrated on the less circuit board, and is assemblied in compactly on the end cap, to reduce the volume of this device as far as possible, so that device is very small and exquisite.The output of test result numeral carries temperature compensation etc., so that Output rusults is more accurate, convenient.According to the computation model, demarcation and the algorithm that leak the foundation of SF6 gas characteristic, guaranteed to leak the accuracy of SF6 gas-monitoring.
Suction-type SF6 Leakage Gas monitoring method of the present invention and device are the monitoring of electrical network SF6 Leakage Gas and the requisite gordian technique of reporting to the police, and it applies the safety that improves the safe operation of electrical network and ensure the electric power practitioner being conducive to.
Description of drawings
Fig. 1 is the structural representation of device of the present invention;
Among the figure: 1. the gas outlet, 2. air intake opening, 3. infrared light supply, 4. diaphragm one, 5. diaphragm two, 6. the reference optical filter, 7. measure optical filter, 8. binary channels infrared eye, 9. hygrosensor, 10. signal condition module, 11.A/D modular converter, 12. data processing modules, 13. light source driver modules, 14. device bodies, 15. end caps one, 16. end caps two;
Fig. 2 is 7 scaling method process flow diagrams;
Fig. 3 is flow chart of data processing figure of the present invention.
Embodiment
The concrete structure of present embodiment is seen accompanying drawing 1, the device body 14 of inner hollow forms an air chamber, the gold-plated reflectance coating of air chamber inwall, set out gas port 1 and air intake opening 2 on it, diaphragm 4 and 5 are equipped with in device body 14 two ends, make air chamber sealing and do not hinder the infrared light transmission, be provided with hygrosensor 9 among the air chamber.The left side of diaphragm 4 is provided with infrared light supply 3, and is fixing and link to each other with device body 14 by end cap 15.The right side of diaphragm 5 is provided with binary channels infrared eye 8, two passage fronts of binary channels infrared eye 8 are equipped with respectively reference optical filter 6 and are measured optical filter 7, thereby so that binary channels infrared eye 8 can be exported a reference signal and a measuring-signal, by the fixing binary channels infrared eye 8 and be connected as a single entity with device body 14 of end cap 16.Described reference optical filter 6 and measurement optical filter 7 for the monitoring of SF6 Leakage Gas is super spike interference filter, the centre wavelength of reference optical filter 6 is 3.95 μ m ± 40nmm, half-band width is 90nm ± 20nm, the centre wavelength of measuring optical filter 7 is 10.55 μ m ± 80nm, and half-band width is 90nm ± 20nm.Be provided with circuit board in end cap 16 outsides, circuit board is fixed on the end cap 16, comprise signal condition module 10 on the circuit board, A/D modular converter 11, data processing module 12 and light source driver module 13,10 pairs of reference signals of signal condition module and measuring-signal amplifies and filtering, A/D modular converter 11 converts analog electrical signal to digital signal that data processing module 12 can receive, data processing module 12 calculates the concentration of tested gas according to the digital signal that receives and this concentration is externally exported, and light source driver module 13 drives infrared light supply 3 and sends stable infrared light.
Connect gas outlet 1 by vacuum pump, impel tested leakage SF6 gas by air intake opening 2 air inlet chamber that continues to flow.Connect after the external power source, light source driver module 13 drives infrared light supply 3 and sends infrared light, through entering the gas absorption in the air chamber, arrive binary channels infrared eyes 8 through reference optical filter 6 and measurement optical filter 7 again, 8 two passages of binary channels infrared eye produce respectively the reference signal and the measuring-signal that comprises tested gas concentration information that comprise light source and environmental information, these two signals are by the amplification of signal condition module 10, filtering and A/D modular converter 11 convert to after the digital signal, be input to data processing module 12, data processing module 12 is removed the impact of light source and environment by Data Processing Platoon, obtains the concentration of tested leakage SF6 gas according to the concentration computation model that writes in advance.Meanwhile, the temperature of the tested leakage SF6 gas that hygrosensor 9 also will detect is input to data processing module 12, data processing module 12 carries out the temperature correction to tested leakage SF6 gas concentration again, thereby obtains real tested leakage SF6 gas concentration, and this SF6 concentration is externally exported.
Data processor adopts the method for multi-point calibration for the characteristic of SF6 gas, and present embodiment is selected seven calibration points, sets up to leak SF6 gas concentration computation model, and the flow process of 7 scaling methods is seen accompanying drawing 2.Timing signal is selected 7 concentration point in leaking SF6 monitoring range ability, the preparation normal mixture, send into normal mixture after, according to measuring voltage V
mWith reference voltage V
RefObtain the variables D of an air inclusion concentration information, according to D value and normal concentration X
0Corresponding relation between the value is set up SF6 gas concentration computation model, and this model is write in the single-chip microcomputer storer.During actual monitoring, data processing module 12 receives measuring voltage V
m, reference voltage V
RefAnd temperature T
mThree numerical value calculate first gas concentration information variable D, to get rid of light source fluctuation and the environmental impact that may exist, adopt look-up table to calculate corresponding concentration value X according to the concentration computation model that writes in advance again
mThen according to temperature T
mCalculate temperature compensation coefficient K and carry out temperature compensation, the gas concentration X after being compensated
T, this concentration is the actual concentration value of tested SF6 gas, and this numerical value is externally exported, and its flow process is seen accompanying drawing 3.
Claims (5)
1. suction-type SF6 Leakage Gas monitoring device is characterized in that: this device comprises gas outlet (1), air intake opening (2), infrared light supply (3), diaphragm one (4), diaphragm two (5), reference optical filter (6), measures optical filter (7), binary channels infrared eye (8), hygrosensor (9), signal condition module (10), A/D modular converter (11), data processing module (12), light source driver module (13), device body (14), end cap one (15) and end cap two (16); The device body of inner hollow (14) forms an air chamber, the gold-plated reflectance coating of air chamber inwall, set out gas port (1) and air intake opening (2) on it, diaphragm one (4) and diaphragm two (5) are equipped with in device body (14) two ends, make air chamber sealing and do not hinder the infrared light transmission, be provided with hygrosensor (9) among the air chamber, the left side of diaphragm one (4) is provided with infrared light supply (3), fixing and link to each other with device body (14) by end cap one (15), the right side of diaphragm two (5) is provided with binary channels infrared eye (8), two passage fronts of binary channels infrared eye (8) are equipped with respectively reference optical filter (6) and are measured optical filter (7), thereby so that binary channels infrared eye (8) can be exported a reference signal and a measuring-signal, by the fixing binary channels infrared eye (8) and be connected as a single entity with device body (14) of end cap two (16), described reference optical filter (6) and measurement optical filter (7) for the monitoring of SF6 Leakage Gas is super spike interference filter, be provided with circuit board in end cap two (16) outsides, circuit board is fixed on the end cap two (16).
2. a kind of suction-type SF6 Leakage Gas monitoring device according to claim 1, it is characterized in that: comprise signal condition module (10) on the circuit board, A/D modular converter (11), data processing module (12) and light source driver module (13), signal condition module (10) is to reference signal and measuring-signal amplifies and filtering, A/D modular converter (11) converts analog electrical signal to digital signal that data processing module (12) can receive, data processing module (12) calculates the concentration of tested gas according to the digital signal that receives and this concentration is externally exported, and light source driver module (13) drives infrared light supply (3) and sends stable infrared light.
3. a kind of suction-type SF6 Leakage Gas monitoring device according to claim 1, it is characterized in that: the centre wavelength of reference optical filter (6) is 3.95 μ m ± 40nmm, half-band width is 90nm ± 20nm, the centre wavelength of measuring optical filter (7) is 10.55 μ m ± 80nm, and half-band width is 90nm ± 20nm.
4. suction-type SF6 Leakage Gas the method for monitoring, adopt claim 1 or 2 or 3 described suction-type SF6 Leakage Gas monitoring devices, it is characterized in that: connect gas outlet (1) by vacuum pump, impel tested gas leakage by air intake opening (2) air inlet chamber that continues to flow, connect after the external power source, light source driver module (13) drives infrared light supply (3) and sends infrared light, through entering the gas absorption in the air chamber, pass through again reference optical filter (6) and measure optical filter (7) and arrive binary channels infrared eye (8), (8) two passages of binary channels infrared eye produce respectively the reference signal and the measuring-signal that comprises tested gas concentration information that comprise light source and environmental information, these two signals are by the amplification of signal condition module (10), filtering and A/D modular converter (11) convert to after the digital signal, be input to data processing module (12), data processing module (12) is removed the impact of light source and environment by Data Processing Platoon, obtain the concentration of tested leakage SF6 gas according to the concentration computation model that writes in advance, meanwhile, the temperature of the tested leakage SF6 gas that hygrosensor (9) also will detect is input to data processing module (12), data processing module (12) carries out the temperature correction to tested leakage SF6 gas concentration again, thereby obtain real tested leakage SF6 gas concentration, this SF6 concentration is externally exported.
5. a kind of suction-type SF6 Leakage Gas the method for monitoring according to claim 4, it is characterized in that: when data are processed in the described data processing module (12) for the characteristic of leaking SF6 gas, adopt the multi-point calibration method, set up and leak SF6 gas concentration computation model, timing signal, in leaking SF6 monitoring range ability, select a plurality of concentration point, the preparation normal mixture, obtain the variables D of an air inclusion concentration information to eliminate the impact of light source according to measuring voltage and reference voltage, set up leakage SF6 gas concentration computation model according to the corresponding relation between D value and the normal concentration X0 value, the temperature information of this model and timing signal is write in the single-chip microcomputer storer in the lump, during actual monitoring, data processing module (12) receives measuring voltage, three numerical value of reference voltage and temperature, calculate first and leak SF6 gas concentration information variable D, to get rid of light source fluctuation and the environmental impact that may exist, calculate corresponding concentration value according to the leakage SF6 gas concentration computation model that writes in advance again, then carry out temperature compensation according to temperature, leakage SF6 gas concentration after being compensated, this concentration are the actual concentration value of tested leakage SF6 gas.
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| CN103698295A (en) * | 2013-12-20 | 2014-04-02 | 中国科学技术大学 | Micro far infrared type gas concentration monitoring method and device |
| CN105136671A (en) * | 2015-10-09 | 2015-12-09 | 厦门钨业股份有限公司 | Gas pond for fluorine-containing gas infrared spectroscopic analysis and application of gas pond to fluorine-containing gas analysis detection |
| CN106990063A (en) * | 2017-04-12 | 2017-07-28 | 中国石油大学(华东) | Infrared spectrometric analyzer |
| CN108332913A (en) * | 2018-02-02 | 2018-07-27 | 国网山东省电力公司潍坊供电公司 | The infrared leak detection auxiliary tools of SF6 |
| CN110006836A (en) * | 2019-04-29 | 2019-07-12 | 江苏万联达医疗科技有限公司 | The device and method of anesthetic gases identification and measurement |
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| CN110553685A (en) * | 2019-09-25 | 2019-12-10 | 厦门钻铂能源技术有限公司 | internet of things device for gas leakage and water level monitoring |
| CN111829974A (en) * | 2020-06-15 | 2020-10-27 | 江苏大学 | Rotary type air chamber infrared gas detection device |
| CN112730301A (en) * | 2020-12-18 | 2021-04-30 | 宁波舜宇红外技术有限公司 | Method for detecting gas concentration by infrared gas alarm |
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| CN103698295A (en) * | 2013-12-20 | 2014-04-02 | 中国科学技术大学 | Micro far infrared type gas concentration monitoring method and device |
| CN105136671A (en) * | 2015-10-09 | 2015-12-09 | 厦门钨业股份有限公司 | Gas pond for fluorine-containing gas infrared spectroscopic analysis and application of gas pond to fluorine-containing gas analysis detection |
| CN105136671B (en) * | 2015-10-09 | 2019-02-19 | 厦门钨业股份有限公司 | A kind of detection application method of fluoro-gas infrared spectroscopy |
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| CN106990063B (en) * | 2017-04-12 | 2019-12-20 | 中国石油大学(华东) | Infrared spectrum analyzer |
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