CN202916062U - Suction-type SF6 gas leakage monitoring device - Google Patents
Suction-type SF6 gas leakage monitoring device Download PDFInfo
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- CN202916062U CN202916062U CN 201220631596 CN201220631596U CN202916062U CN 202916062 U CN202916062 U CN 202916062U CN 201220631596 CN201220631596 CN 201220631596 CN 201220631596 U CN201220631596 U CN 201220631596U CN 202916062 U CN202916062 U CN 202916062U
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Abstract
The utility model provides a suction-type SF6 gas leakage monitoring device. The device comprises a gas outlet (1), a gas inlet (2), an infrared light source (3), a diaphragm 1 (4), a diaphragm 2 (5), a reference light filter (6), a measurement light filter (7), a dual-channel infrared detector (8), a temperature detector (9), a signal conditioning module (10), an A/D conversion module (11), a data processing module (12), a light source driving module (13), a device body (14), an end cover 1 (15) and an end cover 2 (16). The suction-type SF6 gas leakage monitoring device of the utility model is advantageous in digital output/temperature compensation functions, simplicity, reliability, high sensitivity, high monitoring precision, stability, compact structure, small volume and the like; and the suction-type SF6 gas leakage monitoring device can perform quantitative monitoring on SF6 leakage and outputs high-precision concentration of leaked SF6 to the outside.
Description
Technical field
The utility model belongs to SF
6Leakage Gas monitoring field is specifically related to adopt dual wavelength infrared monitoring principle, carries temperature compensation, has high precision suction-type SF6 Leakage Gas monitoring method and device that digital signal is exported.
Background technology
In electric system, SF
6Gas has fabulous insulating property and arc extinction performance because of it, obtains to use widely.But because SF
6Be heavier than air, in case leak, easily be deposited on bottom, power switch chamber, cause human body anoxia when personnel enter.And SF
6Under high temperature or arcing, or when running into moisture, can resolve into multiple noxious material.Therefore explicitly call for SF in " State Grid Corporation of China's electric power safety working regulation "
6Equipment and place need regularly monitor and check, and normal concentration 1000ppm is the Security alert value, and surpassing this concentration will threaten to people's life.
The negative corona discharge detection method is SF
6Leakage Gas detects one of method commonly used, and the method is utilized SF by using the high-voltage breakdown technology
6The electric arc blocking characteristics of gas detects its aerial content.But because SF
6Gas is strong insulating gas, and concentration surpasses certain value namely can stop discharge fully, causes larger measuring error.In addition, if long-time use easily causes probe aging, 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, infrared SF
6The advantage that the conventional art that the leakage monitoring technology has on volume, power consumption, performance, price is incomparable makes its application increasingly extensive.American Electric Power research institute at first is applied to infrared detection technique the SF of transformer station
6The Leakage Gas monitoring, domestic application is in SF at present
6The technology of leakage monitoring and device be the simple application of this technology just, 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 relevant SF
6The monitoring accuracy of 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 utility model proposes a kind of employing dual wavelength infrared monitoring principle for the deficiencies in the prior art, with numeral output, temperature compensation function, simple and reliable, highly sensitive suction-type SF
6Leakage Gas monitoring method and device.The method and device can be to SF
6Leakage is carried out Quantitative Monitoring and is externally exported high precision SF
6Leak concentration value, the advantage such as have that monitoring accuracy is high, reliable and stable, compact conformation, volume are small and exquisite.
The technical solution adopted in the utility model is: a kind of suction-type SF
6Leakage 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 for SF
6The reference optical filter of Leakage Gas monitoring and measurement optical filter are super spike interference filter, are provided with circuit board in end cap two outsides, and 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 do not pass into SF
6Seeing through the light intensity of measuring passage during gas is I
0, the light intensity of reference channel is I '
0Pass into finite concentration SF
6The light intensity of measuring passage behind the 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 tested SF
6The concentration information of 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 SF in addition
6The Leakage Gas the method for monitoring adopts above-mentioned suction-type SF
6The 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 the infrared light that infrared light supply sends, through entering the gas absorption in the air chamber, arrive the binary channels infrared eye through the reference optical filter with after measuring 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 tested leakage SF according to the concentration computation model that writes in advance
6The concentration of gas, meanwhile, the tested leakage SF that hygrosensor also will detect
6The temperature of gas is input to data processing module, and data processing module is again to tested leakage SF
6Gas concentration is carried out the temperature correction, thereby obtains real tested leakage SF
6Gas concentration is with this SF
6Concentration is externally exported.
When wherein, data are processed in the described data processing module for leaking SF
6The characteristic of gas adopts the multi-point calibration method, sets up to leak SF
6The gas concentration computation model, timing signal is leaking SF
6Select a plurality of concentration point in the monitoring range ability, the preparation normal mixture obtains 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 SF
6The gas concentration computation model writes the temperature information of this model and timing signal in the single-chip microcomputer storer in the lump, and during actual monitoring, data processing module receives measuring voltage, reference voltage and three numerical value of temperature, calculates first and leaks SF
6Gas concentration information variable D is to get rid of light source fluctuation and the environmental impact that may exist, again according to the leakage SF that writes in advance
6The gas concentration computation model calculates corresponding concentration value, then carries out temperature compensation according to temperature, the leakage SF after being compensated
6Gas concentration, this concentration are tested leakage SF
6The actual concentration value of gas.
The utility model advantage compared with prior art is:
The utility model adopts dual wavelength infrared monitoring principle, is a kind of efficient, safe SF
6The leakage monitoring technology has the advantages such as monitoring accuracy is high, good stability, reliability is high, the life-span is long.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 leaking SF
6Computation model, demarcation and algorithm that gas characteristic is set up have guaranteed leakage SF
6The accuracy of gas-monitoring.
Suction-type SF of the present utility model
6Leakage Gas monitoring method and device are electrical network SF
6Leakage Gas monitoring and the requisite gordian technique of reporting to the police, 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 utility model;
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 utility model.
Embodiment
The concrete structure of the 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 for SF
6The reference optical filter 6 of Leakage Gas monitoring and measurement optical filter 7 are super spike interference filter, the centre wavelength of reference optical filter 6 is 3.95 μ m ± 40nm, half-band width is 90nm ± 20nm, and 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 SF
6Gas is 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, obtain tested leakage SF according to the concentration computation model that writes in advance
6The concentration of gas.Meanwhile, the hygrosensor 9 tested leakage SF that also will detect
6The temperature of gas is input to data processing module 12, and data processing module 12 is again to tested leakage SF
6Gas concentration is carried out the temperature correction, thereby obtains real tested leakage SF
6Gas concentration is with this SF
6Concentration is externally exported.
Data processor is for SF
6The characteristic of gas, the method for employing multi-point calibration, the present embodiment is selected seven calibration points, sets up to leak SF
6The gas concentration computation model, the flow process of 7 scaling methods is seen accompanying drawing 2.Timing signal is leaking SF
6Select 7 concentration point in the 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 SF
6The gas concentration computation model writes this model 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 tested SF
6The actual concentration value of gas is externally exported this numerical value, and its flow process is seen accompanying drawing 3.
Claims (3)
1. suction-type SF
6The 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 for SF
6Reference optical filter (6) and the measurement optical filter (7) of Leakage Gas monitoring are super spike interference filter, are provided with circuit board in end cap two (16) outsides, and circuit board is fixed on the end cap two (16).
2. a kind of suction-type SF according to claim 1
6The Leakage Gas monitoring device, 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 SF according to claim 1
6The Leakage Gas monitoring device is characterized in that: the centre wavelength of reference optical filter (6) is 3.95 μ m ± 40nmm, and half-band width is 90nm ± 20nm, and the centre wavelength of measuring optical filter (7) is 10.55 μ m ± 80nm, and half-band width is 90nm ± 20nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220631596 CN202916062U (en) | 2012-11-26 | 2012-11-26 | Suction-type SF6 gas leakage monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220631596 CN202916062U (en) | 2012-11-26 | 2012-11-26 | Suction-type SF6 gas leakage monitoring device |
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| CN202916062U true CN202916062U (en) | 2013-05-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017991A (en) * | 2012-11-26 | 2013-04-03 | 中国科学技术大学 | Suction type SF6 gas leakage monitoring device and method |
| CN103743527A (en) * | 2014-01-09 | 2014-04-23 | 上海华虹宏力半导体制造有限公司 | Method for detecting airtightness between bonded wafers by using infrared spectroscopy |
| CN103868879A (en) * | 2014-03-18 | 2014-06-18 | 天津大学 | Fiber Bragg grating-based multi-gas concentration sensor |
| CN108872097A (en) * | 2018-09-27 | 2018-11-23 | 南京工程学院 | A kind of specific gas derived components spectroscopic analysis methods and device |
| CN110793932A (en) * | 2019-11-18 | 2020-02-14 | 国网重庆市电力公司电力科学研究院 | CF4Gas concentration detection method, device and equipment and accuracy verification system |
-
2012
- 2012-11-26 CN CN 201220631596 patent/CN202916062U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017991A (en) * | 2012-11-26 | 2013-04-03 | 中国科学技术大学 | Suction type SF6 gas leakage monitoring device and method |
| CN103017991B (en) * | 2012-11-26 | 2015-05-06 | 中国科学技术大学 | Suction type SF6 gas leakage monitoring method |
| CN103743527A (en) * | 2014-01-09 | 2014-04-23 | 上海华虹宏力半导体制造有限公司 | Method for detecting airtightness between bonded wafers by using infrared spectroscopy |
| CN103743527B (en) * | 2014-01-09 | 2016-08-17 | 上海华虹宏力半导体制造有限公司 | Utilize the bubble-tight method between infrared spectrum detection bonding wafer |
| CN103868879A (en) * | 2014-03-18 | 2014-06-18 | 天津大学 | Fiber Bragg grating-based multi-gas concentration sensor |
| CN103868879B (en) * | 2014-03-18 | 2016-05-11 | 天津大学 | Multiple gases concentration sensor based on Fiber Bragg Grating |
| CN108872097A (en) * | 2018-09-27 | 2018-11-23 | 南京工程学院 | A kind of specific gas derived components spectroscopic analysis methods and device |
| CN110793932A (en) * | 2019-11-18 | 2020-02-14 | 国网重庆市电力公司电力科学研究院 | CF4Gas concentration detection method, device and equipment and accuracy verification system |
| CN110793932B (en) * | 2019-11-18 | 2022-06-17 | 国网重庆市电力公司电力科学研究院 | CF4Gas concentration detection method, device and equipment and accuracy verification system |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20151126 |