CN101634628A - Active infrared SF6 detecting and monitoring instrument - Google Patents

Active infrared SF6 detecting and monitoring instrument Download PDF

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Publication number
CN101634628A
CN101634628A CN 200910157300 CN200910157300A CN101634628A CN 101634628 A CN101634628 A CN 101634628A CN 200910157300 CN200910157300 CN 200910157300 CN 200910157300 A CN200910157300 A CN 200910157300A CN 101634628 A CN101634628 A CN 101634628A
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gas
equipment
infrared
reflecting mirror
optical filter
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朱春才
李运德
刘模
彭珺
熊敏
杨涛
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Abstract

The invention discloses an active infrared SF6 gas leakage detecting instrument which comprises an infrared light source generator (1), a first filter (2), an optical filter (3), a modulator (4), a second filter (5), a first reflecting mirror (6), a second reflecting mirror (7), a third lens (8) and a signal capture coloring amplifier (9). The active infrared SF6 gas leakage detecting instrument is characterized in that a light source in the light source generator (1) is refracted internally to form an alignment light source and is refracted by the first filter (2) to enter the modulator (4) and the optical filter (3), light after being subject to noise reduction by the optical filter enters a space to be detected through the first reflecting mirror and then enters the signal capture coloring amplifier through the second reflecting mirror (7) and the third lens (8) to form a signal; the optical filter (3) has bandwidths of 10.56 micrometers and 10 micrometers, and the Delta n is less than 0.1 micrometer and the transmission ratio is more than 60 percent. The space between the first reflecting mirror (6) and the second reflecting mirror (7) is a detection space, which can be adjusted according to the requirement, the active infrared SF6 gas leakage detecting instrument can be used as an on-line real-time detection device in a special device and can realize that the monitored device is continuously monitored without stopping.

Description

Active infrared SF 6Detection, monitor
Technical field
The invention belongs to the gas detection equipment technical field, be specifically related to a kind of active infrared SF 6Gas leakage detects, monitoring instrument.
Background technology
SF 6Introduce:
SF 6Gas under normal temperature, normal pressure be a kind of colourless, do not have smell, nontoxic and non-flammable gas, its chemical property is highly stable, the density when 20 ℃ and 101325Pa is 6.08g/L, is about 5 times of atmospheric density, SF 6The critical temperature of gas is 45.6 ℃, and is compressed and liquefy, usually with the liquid state steel cylinder transportation of packing into.
SF 6The electrical insulation properties of gas and arc extinction performance are very strong.SF 6Molecular weight be 5 times of air, so SF 6The travelling speed of ion in electric field is more much smaller than airborne nitrogen, oxygen plasma, and easier generation compositeness, fluorine ion reduce the gas charging point, improve the dielectric level of gas greatly, are about 3 times of air.Fluorine element is affine the strongest with joint efforts to electronics in all elements, so SF 6Have very strong electronegativity, very big to the electronics attraction power, very easily form negative ion, so SF 6The arc extinction performance of gas is 100 times of air.Therefore, SF 6Gas is used very extensive in electrical equipment, is the best material of being found at present of insulation arc extinction performance.
Pure SF 6Be a kind of inert gas, the discharge in the equipment can cause SF 6Decomposing gas, its decomposition product and structured material are inconsistent.SF 6Gas produces the decomposition of gas under arcing, overwhelming majority analyte is the monatomic of sulphur and fluorine, behind the arc extinction, major part is reducible again, only have few part in the process of recombination with free metallic atom and water generation chemical reaction, produce metal fluoride and HF is toxic and corrosive substance.
SF 6Be again at chemically extremely stable a kind of gas, its life-span in atmosphere is about 3200.SF particularly 6Ability with very strong absorption infrared radiation is also just said SF 6Be a kind of gas that very strong greenhouse effect are arranged, as with 100 years be baseline, its potential greenhouse effect act as CO 22.39 ten thousand times.Be discharged into the SF in the atmosphere at present in addition 6Gas is just increasing with 8.7% speed.
Comprehensive SF 6Gas distinguishing, the equipment of measuring its leak point is very important.
At present both at home and abroad to SF 6The detection that gas leaks all takes much count of, at present to SF 6The detection means that the equipment internal pressure changes mainly is to utilize gas density relay, in case density monitor is reported to the police, SF has taken place devices illustrated 6The gas leakage failure, but often equipment is in running status, can not have a power failure at once; Promptly allow to arrange to have a power failure, because of the present conventional instrument of stopping leakage in the roof that uses is a handheld device, the maintainer must hand the direct contact detection point of detecting instrument could find that execute-in-place is very inconvenient.Simultaneously, domestic employed checkout equipment mainly uses the specific adsorption probe at present, needs to use argon gas or other special gases, exists probe that the fixedly life-span is arranged, and has the problem of inactivation, at high concentration SF 6Probe can't operate as normal in the space.And present infrared laser leak test plant can't be made trace and reveal.
The disclosed utility model patent in Changzhou City KeNeng Electrical Appliances Co., Ltd 2007 " sulfur hexafluoride leak source laser imager " (CN2856958) this utility model relates to electric power safety checkout equipment technical field, especially a kind of to electric system system sulfur hexafluoride breaker, the sulfur hexafluoride leak source laser imager that the sulfur hexafluoride gas leakage point of high voltage electric equipments such as sulfur hexafluoride gas insulated metal enclosed swit chgear detects, utilize sulfur hexafluoride gas that laser is had stronger back, west ability, adopt infra-red sepectrometry to detect the sulfur hexafluoride gas leak source, and change by photosignal, steps such as image processing are carried out imaging with the leak source position and are shown; But the leakage for trace can't be located, and because of the age limit of infrared laser source, can't carry out online long-time monitoring.
Fujian Normal University 2008 the novel patent of disclosed use " a kind of novel sulfur hexafluoride gas micro-leakage on-line measuring device " (CN201126438), this utility model relates to a kind of gas leak detection apparatus, specifically is the micro-leakage on-Line Monitor Device at the indoor sulfur hexafluoride gas of high-voltage switch gear.There is the problem of a large amount of dosage inactivations in this patent.
The technology of the present invention principle is utilization long-life infrared optical system, finishes measure to require.
Infrared instrument is to survey infrared energy (heat) by noncontact, and is converted into electric signal, and then generates heat picture and signal value on display, and a kind of checkout equipment that can calculate temperature value.Infrared instrument can be with the heat precise quantification that detects, or measures, and makes and not only can observe heat picture, can also accurately discern and strict the analysis the fault zone of heating.Because technical renovation in recent years especially shows detector technology, built-in visible light camera, various automatic functions, development of analysis software or the like makes the infrared analysis solution compare in the past more economical and effective.
Infrared ray is the electromagnetic wave of wavelength 0.78～1000 μ m.The infrared instrument of measuring high temp objects adopts 3～5 mu m wavebands, and the infra-red thermal imaging instrument of the gentle cryogenic object of measuring chamber adopts 8～14 mu m wavebands.
Any object that is higher than the absolute temperature zero degree all is an infrared origin, when there is defective in interior of articles, it will change the heat conduction of object, and the body surface Temperature Distribution is changed, infrared radiation detection apparatus can the surface measurements Temperature Distribution change the position of detecting defects.
The characteristics of infrared detection technology: detector focal length 20cm～infinite distance is applicable to the large-area remote measurement of noncontact; Detector only responds infrared ray, so daytime, night all can work; Can do detection quiet, the dynamic object temperature variation.
The ultimate principle of infrared detection technology
It is uniform that hot-fluid injects, to flawless object, it is uniform basically that the temperature field of front and back distributes, if there is defective in interior of articles, will change in the fault location Temperature Distribution, for the defective of thermal insulation, positive detection mode, fault location is " focus " because of heat build-up, and when the back side was detected, fault location then was low warm spot; And for the defective of thermal conductivity, during positive the detection, the temperature of fault location is low warm spot, and the temperature that the back side detects fault location is " focus ".As seen, adopt infrared detection technology, can detect material surface and superficial defects and scope visually.
The infra-red thermal imaging instrument basic functional principle, press Planck law:
W(λ，T)＝C 1/λ 5[exp(C 2/λT-1] -1(W/cm 2*μm)
In the formula: C 1It is the 1st radiation constant; C 2It is the 2nd radiation constant.
Wavelength is certain, measures infrared energy W and just can calculate temperature value T, and by comparing with black matrix benchmark parameter, instrument processor energy detailed calculated goes out the temperature value of each measuring point reality, and demonstrates the detection faces variation in temperature distribution with the temperature scale of different colours.
The principle of work of gas sensor
The principle that the absorption spectrum that the infrared absorption type gas sensor is based on gas there are differences with the difference of material is made.Gas with various molecular structure of chemistry difference, degree of absorption to IR radiation at different wavelengths is just different, therefore, when IR radiation at different wavelengths shines sample material successively, the radiation energy of some wavelength is selected to absorb by sample material and is died down, produce infrared absorption spectrum, so when knowing the infrared absorption spectrum of certain material, just can therefrom obtain the absorption peak of this material at infrared region.During with a kind of material variable concentrations, in same absorption peak position different absorption intensities is arranged, absorption intensity and concentration are proportional.Therefore by the influence of detected gas, just can determine the concentration of gas to light wavelength and intensity.
According to Bill's Lambert law, the pass between output light intensity, input light intensity and the gas concentration is:
I＝I 0exp(-amLC)
C is a gas concentration to be measured in the formula; L is the action length (sensing length) of light and gas.Following formula is carried out conversion to be got:
C = 1 a m L ln I 0 I
Just can learn the concentration of gas by detecting related data.
The infrared gas sensor sonde configuration is made up of infrared light supply, measurement air chamber, adjustable interference filters, photo-detector, optical modulating circuit, amplification system etc.Infrared light supply adopts nickel filament, can send the infrared ray of 3～10 μ m after its energising heating, has wherein comprised SF 6The strong absorption peak of gas.In air chamber, the gas absorption light source sends the light of specific wavelength, detects through detector and then can demonstrate gas to ultrared absorbing state.Interference filters is adjustable, regulates him and can change the light-wave band that it passes through, thereby change the power that detector detects signal.Infrared eye is a thin-film capacitor, absorbed infrared energy after, gas temperature raises, and causes room pressure to increase, the distance of electric capacity two interpolars will change, capacitance changes thereupon.The concentration of gas to be detected is bigger, and capacitance changes also just big.
The present invention is SF 6The monitoring of gas provides an approach, has solved the contradiction of present equipment between long-time, highly sensitive effectively.
The present invention and prior art difference are: 1, the detected equipment online fixed point of not stopping transport is uninterruptedly monitored sulfur hexafluoride and is leaked; 2, equipment adopts active infrared irradiation technique, radiation of equipment; 3, there is not probe inactivation factor.
Summary of the invention
The object of the present invention is to provide a kind of SF that is applied to use 6The SF of the electric power of gas and other industry equipment 6Body Leak Detection, monitoring equipment.
The object of the present invention is achieved like this: comprise infrared light supply generator (1), first filter (2), optical filter (3), modulator (4) second filters (5), first catoptron (6), second catoptron (7), the 3rd lens (8), signal capture color separation amplifier (9).
Wherein the infrared light that is sent by infrared light supply arrives the modulator optical filter through first filter, shines tested gas by second catoptron again, catches the color separation amplifier through second catoptron, the 3rd lens entering signal afterwards, with faint SF 6Absorption peak detects, and amplifies the formation electric signal.
It is the bandwidth of 10.56 μ and 10 μ that optical filter (3) requires.Require Δ n＜0.1 μ transmitance＞60%.Diameter 35mm-200mm is to big thickness 2mm-5mm.
Because the effect of optical filter, make SF 6The sensitivity of measuring improves, and adopts bi-directional synchronization output to draw difference signal and amplifies, and is scalable to 1000 times, improves sensitivity and establish a little joint as no SF at the balance input end 6In time, regulated zero point, improves sensitivity;
Amplification circuit diagram as shown in Figure 1
The present invention possesses the spatial dimension of detection scalable, wherein the distance between first catoptron (6) and second catoptron (7) can adjusted between the 5CM to 200CM according to detected instrument size, and optical filter (3) diameter is adjusted between 35mm-200mm according to detected space size simultaneously.
Divide invention to possess detected equipment and can not shut down real-time automatically-monitored ability, make the present invention both can be used as leak detection equipment, can be used as the unmanned real-time monitoring equipment under the high-risk environment again.To using SF 6Equipment such as the power high voltage switch of gas improve safety in operation and have played suitable effect.
Description of drawings:
Fig. 1 is an amplification circuit diagram
Application example
Model machine 1:
Measuring distance: 0.5m
Sensitivity 1ppmv
1.0 * 10 -5Atm cc/sec (or mbar liter/second)
Other gas there is not cross-sensitivity
Moisture: unaffected, from 0-100% relative humidity
No toxicity symptom
React t90=1 second.
Alarm
Main frame: 300 * 195 * 80 millimeters
Secondary machine: 300 * 110 * 90 millimeters
Weight
Main frame: 2.5 kilograms
Secondary machine: 1.5 kilograms
Model machine 2:
Measuring distance: 2m
Precision: 1ppmv
The test job temperature range :-30 spend to 50 degree
Test pressure scope: 800hPa-1000hPa
Preheating time: less than 2 minutes
Reaction time: diffusion time, flow velocity was less than 5 seconds less than 25 seconds
Mechanical dimensions: 456 * 372 * 185mm
Weight: 3kg
Secondary machine size: 200 * 60 * 180mm
Secondary machine weight: 1.5kg
Model machine 3:
Measuring distance: 4m
Precision: 1ppmv
The test job temperature range :-30 spend to 50 degree
Test pressure scope: 800hPa-1000hPa
Sensitivity: 0.001scc/sec
Volume (complete machine): 540 * 205 * 105mm
Weight: 6.5KG
Model machine 2 detects the 110kV outdoor high-voltage SF of transformer station 6The alarm equipment alarm of the present invention that isolating switch is installed shows SF takes place 6The gas leakage phenomenon is provided with cast place of position judgment leakage point at isolating switch C phase flange and porcelain vase by the monitoring point simultaneously.With the hand-held leak locator it is carried out leak detection through dividing into the received shipment administrative staff, determine leakage point and present device judgement position consistency at the isolating switch shut down condition.Avoided erroneous judgement to take place, saved a large amount of judgement servicing time,, this shows active infrared SF for plant maintenance provides strong foundation 6The leakage alarm technology is more advanced to high-risk leakage point detection technique, comprehensive, and testing result is more accurate.
Model machine on probation detects the Leak Off Test (LOT) result
The model machine title The place of production Use equipment Method for supervising Leakage point detects number
Model machine
2 The 110KV isolating switch Monitoring ??3
Model machine 3 The 110KV high-voltage switch gear Artificial hand-held regularly detection ??2
MP30 type SF 6Detector Germany The 110KV isolating switch Artificial hand-held regularly detection ??0
??GD-5000SF 6Detector Germany The 110KV high-voltage switch gear Artificial hand-held regularly detection ??0
The LS790B detector The U.S. The 110KV high-voltage switch gear Artificial hand-held regularly detection ??0

Claims (6)

1, a kind ofly is applied to use SF 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment comprise infrared light supply generator (1), first filter (2), optical filter (3), modulator (4) second filters (5), first catoptron (6), second catoptron (7), the 3rd lens (8), signal capture color separation amplifier (9).
2, a kind of SF that is applied to use as claimed in claim 1 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment is characterized in that: optical filter (3) is the bandwidth of 10.56 μ and 10 μ.Require Δ n＜0.1 μ transmitance＞60%.
3, it is characterized in that according to claim 1: carry infrared light supply generator (1).
4, a kind of SF that is applied to use as claimed in claim 1 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment is characterized in that: a kind ofly be applied to use SF 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment is characterized in that: as detecting the space, distance can be adjusted according to actual needs between first catoptron (2) and second catoptron (7).
5, a kind of SF that is applied to use as claimed in claim 1 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment is characterized in that: can be made into hand-held, convenient, flexible mensuration.
6, a kind of SF that is applied to use as claimed in claim 1 6The SF of the electric power of gas and other industry equipment 6Gas Leak Detection, monitoring equipment is characterized in that: can be made into the in-service monitoring pattern, be beneficial to real-time monitoring.
CN 200910157300 2009-07-07 2009-07-07 Active infrared SF6 detecting and monitoring instrument Pending CN101634628A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101943691A (en) * 2010-04-14 2011-01-12 广西电网公司电力科学研究院 Device and method for checking SF6 gas leakage monitoring and alarming apparatuses
CN101783530B (en) * 2010-02-22 2012-10-10 江苏省电力公司无锡供电公司 Intelligent monitoring and auxiliary control system for transformer substation based on Internet of things
CN102809469A (en) * 2011-11-18 2012-12-05 武汉展望星科技有限公司 Infrared spectrum imaging technology-based SF6 gas leakage detection device
CN102998061A (en) * 2012-11-26 2013-03-27 中国科学技术大学 Spreading type device and method for monitoring SF6 gas leakage
CN104833647A (en) * 2015-05-15 2015-08-12 苏州德锐朗智能科技有限公司 Infrared absorption type CO2 concentration detecting method
CN104833646A (en) * 2015-05-15 2015-08-12 苏州德锐朗智能科技有限公司 Detection device based on infrared CO2 sensor
CN104849230A (en) * 2015-05-15 2015-08-19 苏州德锐朗智能科技有限公司 Method for detecting and controlling CO2 concentration in greenhouse environment
CN105203499A (en) * 2015-09-18 2015-12-30 国家电网公司 SF6 gas composition on-line real-time monitoring device and method
CN107727585A (en) * 2017-09-25 2018-02-23 国网重庆市电力公司电力科学研究院 A kind of gas controlling device applied to high-voltage switch gear
CN108827898A (en) * 2018-04-18 2018-11-16 北京理工大学 A kind of infrared microscopy optical enhancement system and method for continuous vari-focus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101783530B (en) * 2010-02-22 2012-10-10 江苏省电力公司无锡供电公司 Intelligent monitoring and auxiliary control system for transformer substation based on Internet of things
CN101943691A (en) * 2010-04-14 2011-01-12 广西电网公司电力科学研究院 Device and method for checking SF6 gas leakage monitoring and alarming apparatuses
CN101943691B (en) * 2010-04-14 2014-03-26 广西电网公司电力科学研究院 Method for checking SF6 gas leakage monitoring and alarming apparatuses
CN102809469A (en) * 2011-11-18 2012-12-05 武汉展望星科技有限公司 Infrared spectrum imaging technology-based SF6 gas leakage detection device
CN102998061A (en) * 2012-11-26 2013-03-27 中国科学技术大学 Spreading type device and method for monitoring SF6 gas leakage
CN102998061B (en) * 2012-11-26 2015-10-21 中国科学技术大学 A kind of diffusion type SF6 Leakage Gas monitoring device and method
CN104833646A (en) * 2015-05-15 2015-08-12 苏州德锐朗智能科技有限公司 Detection device based on infrared CO2 sensor
CN104849230A (en) * 2015-05-15 2015-08-19 苏州德锐朗智能科技有限公司 Method for detecting and controlling CO2 concentration in greenhouse environment
CN104833647A (en) * 2015-05-15 2015-08-12 苏州德锐朗智能科技有限公司 Infrared absorption type CO2 concentration detecting method
CN105203499A (en) * 2015-09-18 2015-12-30 国家电网公司 SF6 gas composition on-line real-time monitoring device and method
CN107727585A (en) * 2017-09-25 2018-02-23 国网重庆市电力公司电力科学研究院 A kind of gas controlling device applied to high-voltage switch gear
CN108827898A (en) * 2018-04-18 2018-11-16 北京理工大学 A kind of infrared microscopy optical enhancement system and method for continuous vari-focus
CN108827898B (en) * 2018-04-18 2021-04-20 北京理工大学 Continuous zooming microscopic infrared optical enhancement system and method

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