CN207248745U - The device of SO2 contents in a kind of Ultraluminescence detection SF6 electrical equipments - Google Patents
The device of SO2 contents in a kind of Ultraluminescence detection SF6 electrical equipments Download PDFInfo
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- CN207248745U CN207248745U CN201720607357.5U CN201720607357U CN207248745U CN 207248745 U CN207248745 U CN 207248745U CN 201720607357 U CN201720607357 U CN 201720607357U CN 207248745 U CN207248745 U CN 207248745U
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Abstract
The utility model discloses a kind of Ultraluminescence to detect SF6SO in electrical equipment2The device of content, including light source generating system, fluorescence reaction room and optical detecting unit, the light of light source generating system transmitting enter fluorescence reaction room, and optical detecting unit is arranged on the outside of fluorescence reaction room, and SO is filtered out by optical filter using ultraviolet source2The spectrum of the wave band of absorption, SO is received by photomultiplier2The fluorescence inspired, SO is calculated further according to Ultraluminescence measuring principle2Concentration, with overcome the deficiencies in the prior art.
Description
Technical field
It the utility model is related to a kind of Ultraluminescence detection SF6SO in electrical equipment2The device of content, belongs to SF6Electrically set
Standby onthe technology of site test field.
Background technology
SF6Some TYPICAL DECOMPOSITION things, wherein SO can be produced after electrical equipment malfunction and in the Hidden fault stage2Just
Catabolite is very important, national grid and south electric network are by SO2Content detection includes preventive trial detection model
Enclose, and the important evidence judged as Hidden fault.Detect SF6SO in electrical equipment2Method it is more, however, due to equipment
Middle SF6Gas SO2Content is 10-6Level, accurate detection are very difficult.
The theoretical foundation of Ultraluminescence detection is to be based on mulecular luminescence spectral principle.Certain is excited using monochromatic light (Single wavelength)
Kind gas molecule produces fluorescence, such as sulfur dioxide.In practical application, in addition to laser can be as quasi-monochromatic light, other are any
What light splitting means (such as interferometric filter, coated reflection piece) obtained is not monochromatic light, is all to have to determine spectral line scope (i.e. more ripples
Long excitation).Therefore, improving accuracy of detection from monochromatic light etection theory, must analyze the fluorescence production of narrow bandwidth excitation beam
Raw rule, provides fundamental basis for fluorescence analysis.At present in the world using this kind of method as SO2Gas magnitude transferring method.
This method is mainly used for field of environment protection, not yet for power industry SF6Electrical device status detection field.
Utility model content
The purpose of this utility model is to provide a kind of Ultraluminescence detection SF6SO in electrical equipment2The device of content, utilizes
Ultraviolet source filters out SO by optical filter2The spectrum of the wave band of absorption, SO is received by photomultiplier2The fluorescence inspired, then
SO is calculated according to Ultraluminescence measuring principle2Concentration, with overcome the deficiencies in the prior art.
To achieve the above object, the technical solution adopted in the utility model detects SF for a kind of Ultraluminescence6Electrical equipment
Middle SO2The device of content, including light source generating system, fluorescence reaction room and optical detecting unit, it is characterised in that：The light source
The light of generating system transmitting enters fluorescence reaction room, and optical detecting unit is arranged on the outside of fluorescence reaction room.
The light source generating system includes ultraviolet lamp, disappear veiling glare door screen, collimation lens and ultraviolet filter, and ultraviolet lamp occurs
Light once by ultraviolet filter, collimation lens and disappear veiling glare door screen subsequently into fluorescence reaction room.
The fluorescence reaction room includes internal measurement optical channel, reference optical receiver, light trapping, the outlet of sample gas and sample gas
Entrance, the outlet of sample gas are arranged on fluorescence reaction outside and lean on close to sources generating system side；Internal measurement optical channel and light trapping
One end connects；The light trapping other end is provided with reference optical receiver, and sample gas inlet is provided with the outside of light trapping.
The optical detecting unit includes photomultiplier and bandpass filter, and bandpass filter is arranged on photomultiplier
Between fluorescence reaction room.
The ultraviolet lamp is the Zn lamps of Alternating Current Power Supply, and line spectrum is distributed between 200-700nm, and primary resonance line is
213.8nm, operating voltage are exchange 1500V.
The ultraviolet filter is the only spectrum ultraviolet filter in the range of reception 250-420nm.
The collimation lens is quartz lens.
The photomultiplier is provided with mounting base, and a piece of semiconductor chilling plate is respectively provided with the outside of mounting base.
Compared with the prior art, the utility model proposes Ultraluminescence method to detect SF6SO in electrical equipment2Content, the party
The advantages of method, is to can be as accurate as 10-9Level, ensures detection SO2The accuracy of content, to judge that equipment running status provide standard
True foundation.
Brief description of the drawings
Fig. 1 is the schematic diagram of device of the utility model；
Label symbol explanation in attached drawing：
1st, internal measurement optical channel；2nd, reference optical receiver；3rd, ultraviolet lamp；4th, photomultiplier；5th, sample gas exports, and 6, sample
Gas entrance, 7, bandpass filter, 8, disappear veiling glare door screen, 9, collimation lens, 10, ultraviolet filter.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
A kind of as shown in Figure 1, Ultraluminescence detection SF of the utility model6SO in electrical equipment2The device of content, including
Light source generating system, fluorescence reaction room and optical detecting unit, the light of light source generating system transmitting enter fluorescence reaction
Room, optical detecting unit are arranged on the outside of fluorescence reaction room, and it is saturating that light source generating system includes ultraviolet lamp 3, the veiling glare door screen 8 that disappears, collimation
Mirror 9 and ultraviolet filter 10, the light that ultraviolet lamp 3 occurs are once right by ultraviolet filter 10, collimation lens 9 and the veiling glare door screen 8 that disappears
Enter fluorescence reaction room afterwards, fluorescence reaction room includes internal measurement optical channel 1, reference optical receiver 2, light trapping, sample gas outlet 5
With sample gas inlet 6, sample gas outlet 5 is arranged on fluorescence reaction outside and leans on close to sources generating system side；Internal measurement optical channel 1
It is connected with light trapping one end；The light trapping other end is provided with reference optical receiver 2, and sample gas inlet, light are provided with the outside of light trapping
Detection unit includes photomultiplier 4 and bandpass filter 7, and bandpass filter 7 is arranged on photomultiplier 4 and fluorescence reaction room
Between.
Pass through spectra database, SO2It is very weak in infrared waveband absorbing, and have three typical absorptions in ultraviolet band
Peak, is 190-230nm strongly absorbing regions, the weak absorbing area of 250-320nm, the pole weak absorbing area of 340-390nm respectively.Therefore can be with
By ultraviolet light wave band to SO2Measure.
In Fig. 1, ultraviolet source filters out SO by optical filter2The light of the wave band of absorption.Received by photomultiplier (PMT)
SO2The fluorescence inspired, so as to calculate SO according to Ultraluminescence measuring principle2Concentration.In the design of device it is main include with
Descend some.
（1）The selection of laser light source and light source intensity control technology
According to existing ultraviolet source, on the one hand require ultraviolet excited fluorescence light source that there is phase in the range of 190-250nm
The excitation wavelength answered；On the other hand require the intensity of excitation source big and stability wants high, because the intensity of exciting light can shadow
The sensitivity of measurement is rung, stability can influence the precision of measurement.
The factor of each side of Considering experimental system, for example, it is the width of the spectral line component of excitation source, spectral line, strong
Degree, stability and humidity consider the Zn lamps of selection continuous work Alternating Current Power Supply, it is one to quenching effect of fluorescence signal etc.
Kind element lamp, line spectrum are distributed between 200-700nm, and wherein primary resonance line 213.8nm power densities are maximum, 213.8nm lines
Power density at one meter is 0.12uW/cm2, and operating voltage is exchange 1500V.
（2）Optical filtering technique
In the light path of whole device, there are two positions to need to filter, one：Due to general light source spectral component compared with
It is more, how required excitation wavelength is obtained from light source light spectrum component, this is one of key of whole device design, when need not
Spectral component enter fluorescence reaction room after, due to the scattering of sample molecule, background signal can be caused excessive, so that system
Signal-to-noise ratio reduces.Secondly：In the place of fluorescence reception, the fluorescence of sulfur dioxide molecule of excitation is allowed to enter reception window as best one can
Mouthful, while reduce the influence of other veiling glares.The method to filter at present is mainly optical filter and monochromator.
According to the fluorescent line scope 240-420nm of sulfur dioxide, fluorescence intensity between is proportional to sulfur dioxide
Concentration, maximum fluorescence intensity is at 320nm.Since molecular scattering is as a result, before the PMT for receiving fluorescence (fluorescence outlet)
The spectrum only received in the range of 250-420nm should be added, and to the optical filtering to be ended in the range of exciting light 200-250nm
Piece.Select the bands of a spectrum of 320nm fluorescent optical filters wide, spectral line of the wavelength less than 250nm is ended.
In order to further improve filter effect, the veiling glare door screen that disappears is added after optical filter and is filtered, according to monochromator principle：Will
Continuous spectrum is separated into monochromatic light by the length order of wavelength and therefrom obtains the monochromatic Optical devices needed for analysis, its point
Scattered process is dispersion, and the later monochromatic light of dispersion reaches fluorescence reaction room through reflection, optically focused by narrow slit.Disappear the work of veiling glare door screen
By required spectral component dispersion in light source be monochromatic light with being, the effect of narrow slit and lens be control light the direction of propagation and
Adjust the intensity of light and take out required monochromatic light, wherein narrow slit plays monochromatic purity adjusting and makees within the specific limits
With their performances to filtering apparatus play very big effect.
（3）Quartz lens
Simple glass lens have ultraviolet light a strong absorption, the exciting light and fluorescence in instrument all in ultraviolet range, because
Lens in this light path are not absorbed or absorbed to ultraviolet light as far as possible seldom.Employ two panels quartz lens in design, it is a piece of
Before laser enters fluorescence reaction room after diaphragm filter system, enter reative cell for assembling more exciting lights, make at the same time
The exciting light that reative cell must be entered collimates as best one can, avoids exciting light from reflecting or scattered so as to cause ambient noise in the reaction chamber
It is excessive；Another in reative cell fluorescence exit, the fluorescence produced for assembling excitation sulfur dioxide, it is therefore an objective to improve detection
Sensitivity and the signal-to-noise ratio of system.
（4）The design of fluorescence reaction room
The optimal optical property of reative cell is maximally to absorb the scattering light of exciting light, while minimally absorbs excitation two
The fluorescence that sulfur oxide produces.There was only exciting light and fluorescence in reative cell, exciting light is the main source of the ambient noise of reative cell,
After the light path to exciting light has done adjustment, the structure design of reative cell is also key one of which.
When excitation light intensity is certain and gas concentration is constant, the signal-to-noise ratio of reative cell and the transversal radius of reative cell, reaction
The length of room, the cross-sectional area of fluorescence outlet have relation.When the absorptivity increase of the shot noise photon to exciting light, quilt
The fluorescent photon number of reception increases with residual noise number of photons ratio, this is conducive to the raising of signal-to-noise ratio and sensitivity；Work as fluorescence
During the cross section increase of outlet, although fluorescent photon number increases, the noise photon being received also increases, therefore there are a conjunction
The section of reason；The length of reative cell is more greatly, it is possible to reduce influence of the exciting light to measurement.
（5）Weak optical signal detection technology
The detection part of device design is the method that fluorescence is produced based on burst of ultraviolel sulfur dioxide molecule, due to SF6Absolutely
Sulfur dioxide concentration in edge electrical equipment is very low, and the fluorescent photon number of generation is seldom, is a kind of faint optical signal, uses PMT
It is detected.
PMT realizes photoelectronic internal amplification by a series of dynode.The method of this internal electron amplification has
Following advantage：1. substantial amounts of noise is not introduced while amplification；2. the detection available for single photon；3. response speed
It hurry up；It is 4. simple in structure.
Therefore PMT can be used for the even single photon detection of pole weak light detection, and PMT has very low detectivity, light
The scope for composing response must be in the fluorescence bands of sulfur dioxide, while its dark counting wants low condition, the molding PMT of choice set,
PMT is internally integrated high voltage power supply, pulse amplifying, the circuit of shaping, as long as the DC voltage of offer+5V works.
In the ideal situation, from the photoelectronic pulse of PMT outputs, it is a reaction of actual value, but be collected into
In addition to normal photoelectronic pulse, also include noise, be mainly reflected in following two forms：1. device becomes with environment temperature in itself
Thermionic noise pulse caused by change and higher than normal electrical pulse, its distribution is similar to photoelectron, and pulse height is opposite
It is relatively low.2. noise pulse caused by the background radiations such as cosmic ray, pulse height are of a relatively high.Using this feature, can set
Upper and lower two discriminators, to being prevented higher than threshold value V2 by upper discriminator, are prevented by lower discriminator less than threshold value V1, so may be used
What it is into counter is pulse between V1, V2.Photon counter is exactly the arteries and veins to being exported by photon counting in the t that fixes time
Punching counts, and obtained overall pulse number divided by gate time, obtains counting rate, i.e., how many counting per second, can be converted to institute
The actual monitoring amount needed.
（6）PMT refrigeration circuits design
PMT dark countings are had an impact in view of environment temperature, refrigerated constant temperature control need to be carried out to it.In order to ensure PMT
Temperature stabilization during work, design PMT, present outside install two panels semiconductor chilling plate, in order to control PMT when working it is residing
The stabilization of environment, the temperature sensor of temperature-control circuit use semiconductor transducer, the electric current letter of semiconductor transducer output
Number by electric resistance changing be voltage signal, voltage signal voltage signal corresponding with temperature with peripheral hardware passes through operational amplifier
Compare, refrigeration circuit can be controlled to work.
The above, is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model discloses
Or replace, it should be covered within the scope of the utility model, therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (8)
1. a kind of Ultraluminescence detects SF6SO in electrical equipment2The device of content, including light source generating system, fluorescence reaction room and
Optical detecting unit, it is characterised in that：The light of the light source generating system transmitting enters fluorescence reaction room, and optical detecting unit is set
Put in the outside of fluorescence reaction room.
A kind of 2. Ultraluminescence detection SF according to claim 16SO in electrical equipment2The device of content, its feature exist
In：The light source generating system includes ultraviolet lamp（3）, disappear veiling glare door screen（8）, collimation lens（9）And ultraviolet filter（10）, it is purple
Outer lamp（3）The light of generation once passes through ultraviolet filter（10）, collimation lens（9）With the veiling glare door screen that disappears（8）It is anti-subsequently into fluorescence
Answer room.
A kind of 3. Ultraluminescence detection SF according to claim 16SO in electrical equipment2The device of content, its feature exist
In：The fluorescence reaction room includes internal measurement optical channel（1）, reference optical receiver（2）, light trapping, sample gas outlet（5）With
Sample gas inlet（6）, the outlet of sample gas（5）It is arranged on fluorescence reaction outside and leans on close to sources generating system side；Internal measurement light leads to
Road（1）It is connected with light trapping one end；The light trapping other end is provided with reference optical receiver（2）, light trapping outside is provided with sample gas
Entrance（6）.
A kind of 4. Ultraluminescence detection SF according to claim 16SO in electrical equipment2The device of content, its feature exist
In：The optical detecting unit includes photomultiplier（4）With bandpass filter（7）, bandpass filter（7）It is arranged on photoelectricity times
Increase pipe（4）Between fluorescence reaction room.
A kind of 5. Ultraluminescence detection SF according to claim 16SO in electrical equipment2The device of content, its feature exist
In：The ultraviolet lamp（3）For the Zn lamps of Alternating Current Power Supply, line spectrum is distributed between 200-700nm, and primary resonance line is
213.8nm, operating voltage are exchange 1500V.
A kind of 6. Ultraluminescence detection SF according to claim 26SO in electrical equipment2The device of content, its feature exist
In：The ultraviolet filter（10）Only to receive the spectrum ultraviolet filter in the range of 250-420nm.
A kind of 7. Ultraluminescence detection SF according to claim 26SO in electrical equipment2The device of content, its feature exist
In：The collimation lens（9）For quartz lens.
A kind of 8. Ultraluminescence detection SF according to claim 46SO in electrical equipment2The device of content, its feature exist
In：The photomultiplier（4）Mounting base is provided with, a piece of semiconductor chilling plate is respectively installed in the outside of mounting base.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720607357.5U CN207248745U (en) | 2017-05-27 | 2017-05-27 | The device of SO2 contents in a kind of Ultraluminescence detection SF6 electrical equipments |
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| CN201720607357.5U CN207248745U (en) | 2017-05-27 | 2017-05-27 | The device of SO2 contents in a kind of Ultraluminescence detection SF6 electrical equipments |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144553A (en) * | 2017-05-27 | 2017-09-08 | 贵州电网有限责任公司电力科学研究院 | A kind of Ultraluminescence detects SF6SO in electrical equipment2The device and method of content |
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- 2017-05-27 CN CN201720607357.5U patent/CN207248745U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144553A (en) * | 2017-05-27 | 2017-09-08 | 贵州电网有限责任公司电力科学研究院 | A kind of Ultraluminescence detects SF6SO in electrical equipment2The device and method of content |
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