CN1645106A - Dissolved gas analyzer of electric power transformer oil based on Raman technology - Google Patents
Dissolved gas analyzer of electric power transformer oil based on Raman technology Download PDFInfo
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- CN1645106A CN1645106A CN 200510023275 CN200510023275A CN1645106A CN 1645106 A CN1645106 A CN 1645106A CN 200510023275 CN200510023275 CN 200510023275 CN 200510023275 A CN200510023275 A CN 200510023275A CN 1645106 A CN1645106 A CN 1645106A
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- circulating line
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Abstract
A device for analyzing gas dissolved in power transformer oil based on Raman technique is featured as connecting sample cell with its optical system to gas compressing device by piping connecting spectrograph to computer through communication line for data exchange, fixing sample cell with its optical system and laser source on an installation plate. The sample cell with its optical system and spectrograph are independent units as they can exchange information to each other by lights.
Description
Technical field
What the present invention relates to is a kind of transformer oil dissolved gas pick-up unit, specifically is a kind of based on dissolved gas analyzer in the electric power transformer oil of Raman technology, belongs to status of electric power detection technique field.
Background technology
Large-scale power transformer is one of most important, the most expensive equipment of power transmission and transformation system, the quality of its insulation status, and can be related to electric system move safely and reliably.Big quantity research and practice to transformer dissolved gas analysis (DGA) both at home and abroad shows the H that dissolves in the transformer oil
2, CH
4, C
2H
2, C
2H
4, C
2H
6, CO and CO
2Etc. the ratio between content, gas production rate and the content thereof of gas componant is the authentic communication of reflection transformer built-in electrical insulation state, can relatively sensitivelyer also find latent transformer defective and fault exactly, generally believe that DGA is the powerful measure of the transformer insulated fault of diagnosis.The DGA monitoring device is installed on one's body the operating transformer, and terrain is gathered the focus that oil sample and monitoring transformer oil dissolved gas become this field in real time.
Find through literature search prior art, " chromatography online monitoring system in the transformer oil " that people such as Chen Xiaodong deliver on " mechanical engineer " 2003 (4)-49-51, the key device of this system is to carry out gas and oil separating plant with molecular film, gas separated is carried out chromatogram identify.Its shortcoming has: one, because the inborn defective of chromatogram, detection sensitivity is low.Two, owing to use the molecular film divided gas flow, the time is long, and so complicated operation is each detection length consuming time.Three, this system is affected by the external environment very big, job insecurity.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, propose a kind of based on dissolved gas analyzer in the electric power transformer oil of Raman technology, make it can be used for online or the various fault signature gases of field monitoring, have highly sensitive, precision is high and advantage such as good reliability.
The present invention is achieved by the following technical solutions, the present invention includes: LASER Light Source, sample cell and optical system thereof, multi-channel spectrometer based, gas compressing apparatus and computing machine communication part.Its annexation is: sample cell and optical system are connected by pipeline with gas compressing apparatus, spectrometer is connected by connection with the computing machine communication part and carries out exchanges data, sample cell and optical system thereof and LASER Light Source are fixed on the installing plate, sample cell and optical system thereof and spectrometer are independently, diffuse information by light.
LASER Light Source adopts the total solidifying laser device of semiconductor laser diode pumping.Output wavelength 532nm, power stability is better than 5%, and compact conformation is easy to use.Make Raman (Raman) spectrum of transformer oil dissolved gas full constituent be positioned at visible waveband, improved widely and accepted sensitivity (contrast infrared spectrum).The Raman spectrographic technique is than infrared spectrum, and the superiority of form and aspect spectroscopic analysis methods is that the light source selectivity is flexible.The characteristic spectral line for well, does not help the disposable detection simultaneously of multiple gases composition with overlapping.Glan prism and isolator; be put in laser instrument light hole front; be fixed on the same installing plate with laser instrument, sample cell and optical system; be that the laser that protection reflects from the sample cell light path can not enter laser instrument; guarantee the injury-free and steady operation of laser instrument; and photodiode is installed on sample cell and optical system rear end, and indication laser operate as normal and power reach ratings (100mW).
Sample cell and optical system thereof comprise: spherical mirror, and photodiode, the Raman light collecting lens, the Notch optical filter, the multichannel spectrometer input slit prevents the parasitic light lens barrel.Spherical mirror has three, places hypomere, hypomere bottom and the epimere top of sample cell and optical system thereof respectively, and photodiode places the spherical mirror rear end at epimere top; The Raman light collecting lens places sample cell and optical system stage casing, and optical filter (532nm＜1 ‰) places sample cell and optical system epimere thereof, prevents that 532nm light from returning.The multichannel spectrometer input slit places sample cell and optical system top thereof, prevents that the parasitic light lens barrel is positioned in the inner chamber of sample cell and optical system.Photodiode indication laser output power and normal operation.
Adopt homocentric spheric reflection mirror system, laser focusing intensity and multipass excite in the raising sample cell, improve more than 50 times than one way excitation laser sample; On sample cell vertical beam of light optical path direction, a spherical reflector is arranged simultaneously, collect reverse Raman scattered light.Image in multichannel spectrometer input slit place by collecting lens.Make full use of the collection angle of multichannel spectrometer in the design, collect and guarantee that the Raman scattered light in the 4 π solid angles enters multichannel spectrometer more than 70%.
Multi-channel spectrometer based is a miniaturization, the multichannel spectrometer of stable performance, burnt long 190nm, grating 1200L/mm, f/3.9, the low noise of 1024 * 256 picture dots, high-sensitive CCD are installed in spectrometer output place, in order to overcome low-intensity shortcoming in the Raman spectrum, must isolate parasitic light and Rayleigh scattering light.The present invention is by anti-parasitic light lens barrel, and metallic seal system and optical filter are isolated Rayleigh scattering light and (can be reached below 5/10000ths) below 0.1%, are detected with the Raman scattering luminous energy that guarantees trace gas.
Gas compressing apparatus comprises: transformer, circulating line, electrovalve, oil sample pond, sampling bag, vacuum tank, vacuum pump, pipeline.Its annexation: circulating line links to each other with transformer crude oil, be used for carrying out the oil sample circulation, the oil sample pond is connected by pipeline with sampling bag, the electronics valve is positioned on circulating line, the pipeline, vacuum pump and pipeline communicate, and total system is bled, and sampling bag places vacuum tank, but do not contact, link to each other with pipeline respectively up and down.
Adopt vacuum head space method and pressure controlling technology oil sample to gather 500ml-1000ml, reflect the operation conditions of power transformer dissolved gas substantially.Power transformer is inner to be produced in the failure process: from minor N
2, O
2, H
2O progressively increases CO, CO
2, H
2To CH
4Deng alkanes gas, the about 10 milliliters of magnitudes of gas flow by vacuum head space method and pressure controlling, are separated out gas in the oil, compress the gas in the sampling bag then, and are pressed into sample cell and reach ratio of compression more than 50 times.Because Raman scattering light signal strength and gas molecule concentration are proportional,, so just can improve detection sensitivity more so ratio of compression is high more.
Computing machine and communication system are realized computing machine to ccd data collection and processing, and carry out the control of various systems.Simultaneously also can transfer data to each control desk by computing machine.Because the technology of this part all is very ripe, does not just do and give unnecessary details.
Entire work process of the present invention can be finished with interior in half an hour.The adjusting of vacuum pump by several electrons valve wherein with oil from circulating line in the suction oil sample chamber, and then the oil sample in the oil sample chamber is vacuumized by vacuum pump and other electronics valves, gas in the oil is drawn in the sampling band, and then by the adjusting of electronics valve and vacuum pump gas is pressed in the optical sample pond, this process approximately needs a few minutes; Start laser then, enter sample cell and optical system thereof, excite oil sample gas back and forth, produce Raman diffused light, collect Raman spectrum with the CCD laser instrument, because be the ppm magnitude, so want a few minutes integral time, by gathering the spectral signal of CCD, by computer processing data, simultaneous computer also can be controlled whole process at last.
Raman detection technique of the present invention can reach oil-immersed power transformer based on the desired precision of various DGA method for diagnosing faults, sensitivity and long-term reliability, can be used for state-detection such as online, the scene of the multiple oil immersed type equipment of electric system and laboratory, exploitation based on the on-line condition monitoring equipment of DGA, portable or vehicular condition detecting device and laboratory with checkout equipment etc.Than other device, this device sensitivity, precision improves greatly, realizes full-automatic control; Working time significantly reduces (reducing more than 5-10 times), has the incomparable superiority of other devices.
Description of drawings
Fig. 1 structural representation of the present invention
Fig. 2 sample cell of the present invention and light path system structural representation thereof
Fig. 3 gas compressing apparatus structural representation of the present invention
Embodiment
As shown in Figure 1, the present invention includes: LASER Light Source 1, sample cell and optical system 2 thereof, multi-channel spectrometer based 3, gas compressing apparatus 4 and computing machine communication part 5.Its annexation is: sample cell and optical system 2 and gas compressing apparatus 4 are connected by pipeline, spectrometer 3 is connected by connection with computing machine communication part 5 and carries out exchanges data, sample cell and optical system 2 thereof and LASER Light Source 1 are fixed on the installing plate, sample cell and optical system 2 thereof and spectrometer 3 are independently, diffuse information by light.
LASER Light Source 1 is the full curing solid frequency double laser 6 by the semiconductor diode laser pumping, and Glan prism 7 and isolator 8 are formed.The three is fixed on the installing plate together, and Glan prism 7 is put in the middle of isolator 8 and the laser instrument 6; And isolator 8 is arranged between sample cell and optical system 2 and the Glan prism 7.
As shown in Figure 2, sample cell and optical system 2 thereof comprise: spherical mirror 9,10, and photodiode 11, spherical mirror 12, Raman light collecting lens 13, Notch optical filter 14, multichannel spectrometer input slit 15 prevents parasitic light lens barrel 16.Spherical mirror 9,10 is a visible wavelength reflecting sphere mirror, places the hypomere and the epimere top of sample cell and optical system 2 thereof respectively, and photodiode 11 places spherical mirror 10 rear ends; Spherical mirror 12 is the high reflecting sphere mirror of visible waveband, be positioned at sample cell and optical system 2 hypomeres thereof bottom, Raman light collecting lens 13 places sample cell and optical system stage casing 2, and optical filter 14 (532nm＜1 ‰) places sample cell and optical system 2 epimeres thereof, prevents that 532nm light from returning.Multichannel spectrometer input slit 15 places the system top, prevents that parasitic light lens barrel 16 is positioned in sample cell and optical system 2 inner chambers thereof.
Laser instrument 6 outgoing laser beams are assembled spherical mirror 9 and are made laser beam focus on homocentric place by one group of homocentric spherical mirror 9,10, increase excitation intensity; Pass through the homocentric spherical mirror 9,10 of this group simultaneously, all there is high reflectance (R＞90%) at the sphere place, and multipass excites homocentric place gaseous sample, increases by 2 orders of magnitude than single exciting.Because laser beam has one (focal spot) with a tight waist and certain depth of focus (length with a tight waist) in homocentric part, this portion gas sample is fully excited simultaneously, its Raman scattered light is all collected slit 15 place's (see figure 1)s, can improve again and accept the sensitivity several times.In order to guarantee fully to gather the Raman scattered light that gaseous sample is excited, in concentric the locating of passing through with 15 of slits perpendicular to laser optical path, adopt visible wavelength reflecting sphere mirror 12, collect rear orientation light, by Raman light collecting lens 13 forward direction, slit 15 places are all collected to Raman scattered light in the back, guarantee that in 4 π solid angles, about Raman scattered light more than 70% all enters slit 15.Remove outside the metal isolation, adopt Notch optical filter 14 basically parasitic light, Rayleigh scattering light to be isolated 10
-5~ 10
-4Below.
Multi-channel spectrometer based 3 is multichannel spectrometers of a miniaturization, stable performance, burnt long 190nm, grating 1200L/mm, f/3.9, low noise, the high-sensitive CCD of 1024 * 256 picture dots installed in spectrometer output place, by anti-parasitic light lens barrel 16, metallic seal system and optical filter 14 are isolated Rayleigh scattering light below 0.1%.
As shown in Figure 3, gas compressing apparatus 4 comprises: transformer 17, circulating line 18,19,31, electrovalve 20,21,22,23,24,25, oil sample pond 26, sampling bag 27, vacuum tank 28, vacuum pump 29, the pipeline 30 that links to each other with atmosphere.Its annexation: circulating line 18 links to each other with transformer 17 crude oil, pipeline 19 connects oil sample pond 26 and sampling bag 27, electronics valve 20,21 is positioned on the circulating line 18, electronics valve 22 is positioned on the pipeline 19, electronics valve 23 is positioned on sampling bag 27 and the pipeline 31 that sample cell optical system 2 links to each other, electronics valve 24 and vacuum tank 28 and pipeline 31 between, valve 25 be positioned at pipeline 30 link to each other with atmosphere the part on, vacuum pump 29 and pipeline 31 communicate, and be installed in the terminal point of pipeline 31, sampling bag 27 places vacuum tank 28, links to each other with pipeline 31,19 respectively up and down.
Claims (6)
1, a kind of based on dissolved gas analyzer in the electric power transformer oil of Raman technology, comprise: multi-channel spectrometer based (3), computing machine communication part (5), it is characterized in that, also comprise: LASER Light Source (1), sample cell and optical system thereof (2) and gas compressing apparatus (4), sample cell and optical system (2) are connected by pipeline with gas compressing apparatus (4), spectrometer (3) is connected by connection with computing machine communication part (5) and carries out exchanges data, sample cell and optical system thereof (2) and LASER Light Source (1) are fixed on the installing plate, sample cell and optical system thereof (2) and spectrometer (3) are independently, diffuse information by light.
2, according to claim 1 based on dissolved gas analyzer in the electric power transformer oil of Raman technology, it is characterized in that, LASER Light Source (1) is the full curing solid frequency double laser (6) by the semiconductor diode laser pumping, Glan prism (7) and isolator (8) are formed, the three is fixed on the installing plate together, Glan prism (7) is arranged in the middle of isolator (8) and the laser instrument (6), and isolator (8) is arranged between sample cell and optical system (2) and the Glan prism (7).
3, according to claim 1 based on dissolved gas analyzer in the electric power transformer oil of Raman technology, it is characterized in that, sample cell and optical system thereof (2) comprising: spherical mirror (9,10), photodiode (11), spherical mirror (12), Raman light collecting lens (13), optical filter (14), multichannel spectrometer input slit (15), prevent parasitic light lens barrel (16), its annexation is: spherical mirror (9,10) place the hypomere and the epimere top of sample cell and optical system thereof (2) respectively, photodiode (11) places spherical mirror (10) rear end, spherical mirror (12) is positioned at sample cell and optical system (2) hypomere bottom thereof, Raman light collecting lens (13) places sample cell and optical system (2) stage casing, optical filter (14) places sample cell and optical system (2) epimere thereof, and multichannel spectrometer input slit (15) places sample cell and optical system (2) top thereof, prevents that parasitic light lens barrel (16) is positioned in sample cell and optical system (2) inner chamber thereof.
4, according to claim 3ly it is characterized in that based on dissolved gas analyzer in the electric power transformer oil of Raman technology spherical mirror (9,10) is a visible wavelength reflecting sphere mirror, spherical mirror (12) is the high reflecting sphere mirror of visible waveband.
5, according to claim 1ly it is characterized in that multi-channel spectrometer based (3) based on dissolved gas analyzer in the electric power transformer oil of Raman technology, its burnt long 190nm, grating 1200L/mm, f/3.9, spectrometer output place is provided with the CCD of 1024 * 256 picture dots.
6, according to claim 1 based on dissolved gas analyzer in the electric power transformer oil of Raman technology, it is characterized in that, gas compressing apparatus (4) comprising: transformer (17), circulating line (18,19,31), electrovalve (20,21,22,23,24,25), oil sample pond (26), sampling bag (27), vacuum tank (28), vacuum pump (29), pipeline (30), its annexation is: circulating line (18) links to each other with transformer (17) crude oil, circulating line (19) connects oil sample pond (26) and sampling bag (27), electronics valve (20,21) be positioned on the circulating line (18), electronics valve (22) is positioned on the circulating line (19), electronics valve (23) is positioned on sampling bag (27) and the circulating line (31) that sample cell and optical system (2) thereof link to each other, electronics valve (24) be positioned at and vacuum tank (28) and circulating line (31) between, valve (25) is positioned on the section of tubing (30) that links to each other with atmosphere, vacuum pump (29) and circulating line (31) communicate, and be located at the terminal point of circulating line (31), sampling bag (27) places vacuum tank (28), up and down respectively and circulating line (31,19) link to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100232758A CN100351624C (en) | 2005-01-13 | 2005-01-13 | Dissolved gas analyzer of electric power transformer oil based on Raman technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100232758A CN100351624C (en) | 2005-01-13 | 2005-01-13 | Dissolved gas analyzer of electric power transformer oil based on Raman technology |
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| CN1645106A true CN1645106A (en) | 2005-07-27 |
| CN100351624C CN100351624C (en) | 2007-11-28 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102445473A (en) * | 2011-11-16 | 2012-05-09 | 北京明尼特环保科技有限公司 | Method and system for monitoring and analyzing air |
| CN103822910A (en) * | 2012-11-16 | 2014-05-28 | 福州高意通讯有限公司 | Raman probes for miniature Raman spectrometer |
| CN103930770A (en) * | 2011-10-21 | 2014-07-16 | Abb技术有限公司 | Sensor structure for online monitoring of furans in power transformers |
| CN104165880A (en) * | 2014-08-20 | 2014-11-26 | 国家电网公司 | Online detecting method of dissolved gas in transformer oil |
| JP2015052551A (en) * | 2013-09-09 | 2015-03-19 | 株式会社かんでんエンジニアリング | Component-in-oil measuring method and oil-filled electric instrument |
| CN104677860A (en) * | 2015-02-04 | 2015-06-03 | 南昌航空大学 | Rapid aircraft fuel cleanliness detection method |
| CN108918459A (en) * | 2018-09-28 | 2018-11-30 | 国网辽宁省电力有限公司电力科学研究院 | A kind of Gases Dissolved in Transformer Oil on-Line Monitor Device and method based on spectral technique |
| CN109682791A (en) * | 2019-01-25 | 2019-04-26 | 奥谱天成(厦门)科技有限公司 | A kind of hand-held Raman spectrometer of the non-fiber freely transmitted based on light space |
| CN110530848A (en) * | 2019-09-27 | 2019-12-03 | 国网重庆市电力公司电力科学研究院 | A kind of detection device and detection method |
| CN113324913A (en) * | 2021-05-19 | 2021-08-31 | 西安交通大学 | Device and method for measuring cavitation threshold of transformer oil based on vibration exciter |
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| US5455673A (en) * | 1994-05-27 | 1995-10-03 | Eastman Chemical Company | Apparatus and method for measuring and applying a convolution function to produce a standard Raman spectrum |
| JPH08338806A (en) * | 1995-06-12 | 1996-12-24 | Tokyo Electric Power Co Inc:The | Apparatus for measuring concentration of gas in oil |
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| CN103930770A (en) * | 2011-10-21 | 2014-07-16 | Abb技术有限公司 | Sensor structure for online monitoring of furans in power transformers |
| CN102445473A (en) * | 2011-11-16 | 2012-05-09 | 北京明尼特环保科技有限公司 | Method and system for monitoring and analyzing air |
| CN102445473B (en) * | 2011-11-16 | 2014-07-16 | 北京安普兑电子科技有限公司 | Method and system for monitoring and analyzing air |
| CN103822910A (en) * | 2012-11-16 | 2014-05-28 | 福州高意通讯有限公司 | Raman probes for miniature Raman spectrometer |
| JP2015052551A (en) * | 2013-09-09 | 2015-03-19 | 株式会社かんでんエンジニアリング | Component-in-oil measuring method and oil-filled electric instrument |
| CN104165880A (en) * | 2014-08-20 | 2014-11-26 | 国家电网公司 | Online detecting method of dissolved gas in transformer oil |
| CN104165880B (en) * | 2014-08-20 | 2016-09-21 | 国家电网公司 | A kind of online test method of Gases Dissolved in Transformer Oil |
| CN104677860A (en) * | 2015-02-04 | 2015-06-03 | 南昌航空大学 | Rapid aircraft fuel cleanliness detection method |
| CN108918459A (en) * | 2018-09-28 | 2018-11-30 | 国网辽宁省电力有限公司电力科学研究院 | A kind of Gases Dissolved in Transformer Oil on-Line Monitor Device and method based on spectral technique |
| CN109682791A (en) * | 2019-01-25 | 2019-04-26 | 奥谱天成(厦门)科技有限公司 | A kind of hand-held Raman spectrometer of the non-fiber freely transmitted based on light space |
| CN110530848A (en) * | 2019-09-27 | 2019-12-03 | 国网重庆市电力公司电力科学研究院 | A kind of detection device and detection method |
| CN113324913A (en) * | 2021-05-19 | 2021-08-31 | 西安交通大学 | Device and method for measuring cavitation threshold of transformer oil based on vibration exciter |
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