CN201402257Y - Gas content on-line monitoring system in transformer oil - Google Patents
Gas content on-line monitoring system in transformer oil Download PDFInfo
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- CN201402257Y CN201402257Y CN2009200837627U CN200920083762U CN201402257Y CN 201402257 Y CN201402257 Y CN 201402257Y CN 2009200837627 U CN2009200837627 U CN 2009200837627U CN 200920083762 U CN200920083762 U CN 200920083762U CN 201402257 Y CN201402257 Y CN 201402257Y
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Abstract
The utility model relates to a gas content on-line monitoring system in transformer oil, and comprises an authority management system, a station monitoring system and a field monitoring system, wherein the authority management system comprises a data base server, a WEB inquiry workstation and a TCP/IP network. The system is characterized in that the field monitoring system further comprises an opto-acoustic detecting system which consists of an opto-acoustic tank, a microphone, an optical filter, a photomodulator, an illuminator, a stepping motor, a pre-amplifier, a phase locking amplifier, adigital-to-analog converter, a DSP data transmitter and a filed detection controller. The gas opto-acoustic and optical spectrum method is adopted to measure the gas resolved in transformer oil, the operation quality of electric power equipment or the category and the gravity degree of failures is accurately judged according to the variety and concentration of the gas, so as to precisely diagnosethe operation state of the electric power equipment or the failure nature and degree. The system has the advantages of simple structure and stabile operation, and can perform long-term on-line monitoring.
Description
Technical field
The utility model relates to a kind of Gas in Oil of Transformer content on-line monitoring system, belongs to the on-line monitoring of high-voltage electric equipment field.
Background technology
Since at present the prophylactic repair system of in electric system, generally carrying out the needs of incompatibility electric system reform and development and power consumer to the requirement of power supply reliability, electric power enterprise has pressed for the more advanced in the world state maintenance of implementation, promptly determine whether to need repairing and how to keep in repair according to equipment running status, and on-line monitoring be to high voltage electric equipment carry out state maintenance must and effective means.
Because electrical equipments such as power transformer, reactor, sleeve pipe all select for use oil or oilpaper and cardboard to form insulation system, when device interior generation hot stall, discharge property fault or oil, when paper is aging, can produce multiple gases.These gases can be dissolved in the oil, and dissimilar gas and concentration can reflect dissimilar electric faults.At present, the method that power transformer is carried out fault judgement mainly contains the monitoring method of gas content in shelf depreciation diagnosis and the insulating oil.Wherein, " the partial discharge of transformer on-Line Monitor Device " of patent publication No. 02277287 goes out electric signal with shelf depreciation situation in the transformer running status by sensor senses and receives by monitoring in time through amplifying, but this method is subjected to the on-the-spot interference of electromagnetic field easily, and discharge signal is difficult to extract.
The effective ways that transformer fault is judged still are gas content monitoring method in the insulating oil, can be divided into two kinds of off-line type and on-line monitoring formulas, the gas chromatograph of off-line type has advantages such as selectivity is good, separating property is high, disengaging time is fast, highly sensitive and applied widely, but also there is a series of weak point, there is personal error in degassing operation, and the artificial correction of detection curve also can add mistake; From the gas-oil separation that draws oil sample again to lab analysis, the job procedure complexity, spended time is long; In addition, the development faster or slower of insulation degradation, preventive trial can not be found fault in real time, gas content in the electric power transformer oil is implemented on-line monitoring has become exigence.The gas chromatography monitoring system of on-line monitoring formula has solved shortcomings such as the chromatographic sense cycle of off-line type is long, analysis time is long well.But most of at present online monitoring system, for example the patent No. is that method that 02277289 " transformer oil dissolved gas on-Line Monitor Device " mentioned only uses in the oil gas intelligence sensor to measure, and measuring accuracy is low, measurement gas is few, long-term work is unstable, the later maintenance amount is big.
Summary of the invention
The purpose of this utility model is to provide a kind of Gas in Oil of Transformer content on-line monitoring system, and it can replace the off-line type chromatograph based on photocaustic spectroscopy, can long-term stability run on the scene again; The utility model detected gas kind is many, reduces the complexity and the instability of oil in the online detection transformer simultaneously greatly.
The technical solution of the utility model is: Gas in Oil of Transformer content on-line monitoring system, comprise an innings square tube reason system, the side's of station monitoring system, field monitoring system, its innings square tube reason system is made up of database server, WEB inquiry workstation and TCP/IP network three parts; The side's of station monitoring system is made up of data collection process server, supervisory control comuter and full distributed Based Intelligent Control Lon works network, and the side's of station monitoring system is connected through the database server of TCP/IP network with square tube reason system of office; Its field monitoring system comprises transformer oil valve, oil-gas separator, gas circuit controller, and transformer oil valve one end links to each other with the insulation grease chamber of converting equipment, and an end links to each other with oil-gas separator, and the other end of oil-gas separator is connected with the gas circuit controller; It is characterized in that: the field monitoring system also comprises the photo-acoustic detection system, and the photo-acoustic detection system is made up of photoacoustic cell, microphone, optical filter, photomodulator, laser instrument, stepper motor, prime amplifier, lock-in amplifier, digital to analog converter and DSP data transmitter and the on-the-spot controller that detects; The draft tube of photoacoustic cell is connected with the valve of Gas controller respectively with escape pipe, the gas circuit controller is electrically connected with the on-the-spot controller that detects, laser instrument, photomodulator and optical filter are formed light path, the step motor control optical filter moves to the light inlet of photoacoustic cell, stepper motor is electrically connected with the on-the-spot controller that detects, the photoacoustic cell outer wall is connected with microphone, microphone is electrically connected with prime amplifier, prime amplifier is electrically connected with lock-in amplifier, lock-in amplifier is electrically connected with digital to analog converter and laser instrument, digital to analog converter is electrically connected with the DSP data transmitter, and the DSP data transmitter is connected with the data collection process server through Lon Works network by data telecommunication line.
Aforesaid Gas in Oil of Transformer content on-line monitoring system is characterized in that: between the light inlet and draft tube of photoacoustic cell, all be provided with two acoustic filters between light-emitting window and the escape pipe.
Aforesaid Gas in Oil of Transformer content on-line monitoring system is characterized in that: photoacoustic cell is resonant cylindrical, is made by the metal material that heat transfer coefficient is bigger.
Aforesaid Gas in Oil of Transformer content on-line monitoring system is characterized in that: laser instrument is incoherent wide light source, its characteristic wavelength 2-20 μ m.
Aforesaid Gas in Oil of Transformer content on-line monitoring system is characterized in that: microphone is the EK-23024 of knowles company, and measuring accuracy is 10mv/mP.
Principle of work of the present utility model is: the measurement of employing gas photocaustic spectroscopy is dissolved in the gas in the transformer oil, promptly after the sample pneumatic transmission is gone into photoacoustic cell, close the gas circuit valve, with the sample gas in the laser emission photoacoustic cell of laser instrument transmission, gas produces sound wave by the absorbing light pulse, detect its intensity by microphone, then signal by preposition amplification, phase-locked amplification after, gather its data with high precision digital-to-analog converter and DSP data transmitter, and store; Lock-in amplifier carries out the analysis of optoacoustic phase drift simultaneously, running quality or the fault category and the fault order of severity of accurately judging power equipment according to the kind and the concentration of gas.
Adopted the measurement of gas photocaustic spectroscopy to be dissolved in gas in the transformer oil, the absorption of light source photon energy is come the concentration of quantitative test gas by the detected gas molecule, it belongs to measures the analysis method for gases that absorbs, detection method with respect to direct measuring light emittance has increased the process that heat energy is become voice signal, also belongs to the method for heat determination.Light source is modulated with certain audio frequency, in a special photoacoustic cell, just can be detected the voice signal identical, Here it is material photoacoustic signal to be measured by microphone with frequency.
Because electrical equipments such as converting equipment, reactor, sleeve pipe all select for use oil or oilpaper and cardboard to form insulation system, when device interior generation hot stall, discharge property fault or oil, when paper is aging, can produce all gases.These gas dissolvings are in oil, and dissimilar gas and concentration can reflect dissimilar electric faults.The gas that is dissolved in the transformer oil mainly contains hydrogen, acetylene, ethene, methane, ethane, carbon monoxide, carbon dioxide etc.Majority of gas all has the following feature:
One. the optoacoustic characteristic: when with rayed gas, gas can absorb photon energy, expands, and increases volume, can produce ultrasound wave during expansion, and gas concentration is big more, and amplitude of ultrasonic is strong more.
Two. spectral characteristic: all to the photon energy absorption value maximum of certain wavelength, peak-peak takes place when absorbing to each gas molecule in promptly a kind of gas photon energy to a kind of wavelength, and different gas absorption photon energy wavelength the most for a long time is all different.But also there is the wavelength of small part gas or material absorbing photon energy peak overlapping, produces and intersect.Choose absorption peak and should avoid overlapping absorption peak as far as possible, peak value is big as far as possible.Also separate with water as far as possible, avoid causing cross influence.Should select absorption peak big, require not have cross influence again, through experiment, the wavelength such as the following table of the absorption photon energy maximum of portion gas in the transformer oil:
| Gas composition | Molecular weight | Feature wave number/(cm -1) | Characteristic wavelength/μ m | |
| Methane | ||||
| 16 | 1254 | 7.974 | Water | |
| Ethane | 30 | 861 | 11.614 | Water |
| Ethene | 28 | 1061 | 9.425 | |
| Acetylene | ||||
| 26 | 783 | 12.771 | Water |
| Carbon monoxide | 28 | 2150 | 4.651 | Water |
| Carbon dioxide | 44 | 668 | 14.970 | Water |
As seen from the above table, all there is stronger absorption peak at ethane, ethene, acetylene, carbon monoxide and carbon dioxide listed feature wave number place in table, and does not have cross interference between each gas, also can not be subjected to the influence of transformer W/O.Methane is at 1254cm
-1Though the place can avoid the characteristic frequency spectrum of other gas, is in the absorption band of water, can be subjected to the influence of water.So in system, will consider the influence of filtering water.As seen from the above table, the characteristic wavelength that oil chromatography need detect is between the 4.651 μ m-14.97 μ m, therefore just relatively is applicable to gas detector in the adjustable radiation source of this wave band.Can be divided into pulse and continuous radiation two classes by the working method optical emitter, the light beam that becomes when becoming intensity for the light beam that makes continuous radiation also needs various corresponding modulation techniques usually.If the characteristic by radiation itself is divided, radiating light source can be divided into incoherent light source and relevant LASER Light Source two classes again.In general the tunable range of laser instrument is wide less than incoherent light source, can not measure a variety of gases simultaneously, and the wide laser of adjustable extent is relatively more expensive, so adopt incoherent light source proper usually.Because the incoherent light source emission is continuous spectrum, therefore must use wavelength to select element.(as optical filter or monochromator).
Three. optoacoustic phase drift: in fact also have the portion gas that does not absorb or seldom absorb photon energy, as hydrogen.But it has other optoacoustic spectroscopy characteristic hydrogen, when promptly being background gas with the air, when molecular weight gas in temperature stabilization and the volume within the specific limits the time, the relative drift in light activated ultrasound wave travel-time in the mixed gas that contains the different hydrogen molecular weight is directly proportional with the hydrogen molecule amount, be that hydrogen influences its velocity of propagation to the optoacoustic that produces, the optoacoustic phase place drifted about, in mixed gas, the proportion of hydrogen is big more, and the optoacoustic phase shifts is big more; The sensitivity of measuring can reach 200uL/L, and this sensitivity is almost not change in 20～100 scopes at the mean molecular weight of background gas.Utilize this characteristic also can use photocaustic spectroscopy to detect the hydrogen that does not absorb photon energy.The principal element that influences accuracy of measurement comprises the stability of the gentle room temperature of change of the mean molecular weight that the change of background gas component causes; The used light source of excitation sound wave from ultraviolet, visible, infrared, when microwave changes, its measurement result unanimity.
Consider H in the air chamber that normally used gas and oil equilibration method obtains
2Volume fraction, often be 20 times of gas volume mark in the oil, the sensitivity of 200uL/L means can measure that the gas volume mark is 10uL/L in the oil, this is for H in most transformer oil
2Volume fraction is the monitoring of 60uL/L, and its sensitivity is enough to meet the demands, and has also surpassed the sensitivity of existing on-line chromatograph and online Fourier infrared spectrum.
Because for little air chamber, its temperature stabilization is not a difficult matter in ± 0.1 ℃ of scope, so the difficult point of problem concentrates in the change of mean molecular weight of background gas component.The mean molecular weight of air is 29, CH in native system
4And CO
2Influence to the background gas mean molecular weight is big slightly, and the influence of other gas is then very little.Consider that optoacoustic spectroscopy can provide the volume fraction value of other component,, it is also conceivable that and carry out necessary correction therefore for the influence of background gas component.
This shows H
2Though do not absorb infrared light, the phase shifts when measuring sound wave that the absorption of other any gas produces and propagating in air chamber but can provide H
2Volume fraction.
Because the dissimilar gases and the concentration that are dissolved in the transformer oil can reflect dissimilar electric faults.Need only gaseous species and the concentration that accurately detects in the transformer oil so, just can accurately judge the operation conditions of power equipment or the character and the order of severity of fault.From above-mentioned gas characteristic as can be known, utilize the optoacoustic spectroscopy characteristic of Gas in Oil of Transformer just can accomplish this point easily.
The beneficial effects of the utility model are: (1) the utility model adopts vacuum quantitative method separation oil and gas, degassing rate height, and the degassing time is short, can be repeatedly used.The optoacoustic method is to produce hyperacoustic characteristics when utilizing gas to the photonic absorption energy, and utilize optoacoustic effect to measure to absorb photon energy phase shifts very little or that do not absorb photon energy gas to come detected gas, its sensitivity is higher, and is stable, dependable performance; Since little when detecting to the demand of gas, just simplified the structure of gas-oil separation and gas circuit controller greatly, and the volume of photoacoustic cell is also little, makes easy to manufacture, cheap.In the method and system of above-mentioned utilization spectrum optoacoustic on-line monitoring Gas in Oil of Transformer content, spectroscopic methodology is a spectral characteristic of utilizing the gas absorption photon energy, adopt wide light source, provide the wavelength of wider range can detect multiple gases, make to manufacture and design flexibly simply; Adopt a kind of gas only to the characteristic of the photonic absorption energy maximum of certain wavelength, the utilization optical filter provides monochromatic illumination to detect a kind of gas, makes and detects accurately; Use stepper motor that multiple optical filter is provided, thereby multiple monochromatic light photograph can be provided, can detect multiple gases, greatly widened the scope of detection failure.Owing to used microphone as detecting element, under normal temperature condition its sensitivity drift very little, the life-span is long, and is easy to maintenance, maintenance is little; Little and be hedged off from the outer world because of photoacoustic cell, and adopted acoustic filter to filter background and source noise, and use escape pipe that the waste gas of photoacoustic cell is got rid of, guarantee the not contaminated and interference of photoacoustic cell, the precision height that makes detection, the checkout equipment life-span is long, the reliability height.Owing in the system of utilization spectrum optoacoustic on-line monitoring Gas in Oil of Transformer content, do not have pre-heating device, adopt Electronic Control and computer technology simultaneously, it is fast to make it detection speed, and detection time is short.Also owing to adopted Computer Processing and network technology, a large amount of converting equipments can not only be carried out on-line monitoring, form multistage monitoring net, can also handle judgement to the information that detects automatically, inquiry and report are provided, note abnormalities and can in time give a warning, and the relevant details of trouble spot can be provided, its system's operational reliability is high, operating cost is low, save manpower, fault handling is timely, has improved the operational efficiency and the quality of power equipment greatly.
(2) compare with on-line chromatograph, optoacoustic spectroscopy does not consume sample, does not need the expendable carrier gas, does not need to pollute aging chromatographic column and complicated air-path control system easily, and its sensitivity is higher, and cost is also enough low.Compare with fourier infrared, its most outstanding characteristics are to utilize optoacoustic effect to measure H
2Volume fraction.And compare with all optical meanss of measuring the transit dose change, optoacoustic spectroscopy can directly be measured uptake and greatly improve detection sensitivity.The raising of sensitivity has produced many active influences, at first is embodied in the requirement to the gas-oil separation technology.Because gas and oil equilibration time and air chamber volume are inversely proportional to, and in fourier infrared is measured, use the volume in ultra micro gas pond also to reach 100mL, thus higher to the gas-oil separation technical requirement.And the gas pond of optoacoustic spectroscopy only needs the volume of 2～3mL, greatly reduces the difficulty to gas-oil separation.Next is the selection at characteristic spectrum peak.In fourier infrared, because gas pond limited length is only measured at stronger characteristic absorption place, could obtain enough sensitivity, therefore, detect at the overlapping that each component characteristics absorbs; In optoacoustic spectroscopy, because the raising of detection sensitivity, can detect in extremely weak absorption place and obtain enough sensitivity, thereby can select not disturbed by other component, even remove CH
4Be not subjected to moisture and CO outward fully yet
2The characteristic frequency spectrum that disturbs.Thereby improved degree of accuracy and the accuracy of measuring.From effect, the detection index of portable photo-acoustic spectrometer has also all surpassed online Fourier infrared spectrograph.
Description of drawings
Fig. 1 is the utility model embodiment theory diagram.
Fig. 2 is the utility model embodiment field monitoring system architecture diagram.
Fig. 3 is the photoacoustic cell structural representation among Fig. 2.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
The explanation of mark among Fig. 1: the 1-supervisory control comuter, 2-Lon Works network, the 3-TCP/IP network, the 4-database server, 5-WEB inquires about workstation, on-the-spot controller, the 7-data collection process server of detecting of 6-.
The explanation of mark among Fig. 2: 8-transformer oil valve, the 9-oil-gas separator, 10-gas circuit controller, 11-photoacoustic cell, the 12-microphone, the 13-optical filter, 14-photomodulator, 15-prime amplifier, 16-lock-in amplifier, 17-digital to analog converter, the 18-DSP data transmitter, the 19-stepper motor, 20-data telecommunication line, 21-laser instrument.
The explanation of mark among Fig. 3: 22-light inlet, 23-acoustic filter, 24-draft tube, 25-escape pipe, 26-light-emitting window.
The utility model embodiment theory diagram is pressed distributed design, modular construction based on the Gas in Oil of Transformer content on-line monitoring system of photocaustic spectroscopy as shown in Figure 1, has very strong expandability.Its basic framework is pressed the three-layer architecture design, specifically comprises: square tube reason system of office; The side's of station monitoring system; The field monitoring system.
Its innings square tube reason system is made up of TCP/IP network 3, database server 4 and WEB inquiry workstation 5 three parts, database server 4 finish data storage, data maintenance and with the function of other system interface.
The side's of station monitoring system is made up of supervisory control comuter 1, Lon works network 2 and data collection process server 7; The side's of station monitoring system is finished telecommunication management, data aggregation, data processing, the storage to end device; The query display of data, demand value threshold values are provided with, the analyzing and diagnosing function; And relevant data is uploaded innings square tube manage a system.
The field monitoring system finishes gas sampling control in the oil of transformer, gas circuit FLOW CONTROL, gas concentration measurement, data communication etc.
The utility model embodiment field monitoring system architecture diagram as shown in Figure 2, its field monitoring system comprises transformer oil valve 8, oil-gas separator 9, gas circuit controller 10 and photo-acoustic detection system, transformer oil valve 8 one ends link to each other with the insulation grease chamber of converting equipment, one end links to each other with oil-gas separator 9, the other end of oil-gas separator 9 is connected with gas circuit controller 10, and the photo-acoustic detection system is by photoacoustic cell 11, microphone 12, optical filter 13, photomodulator 14, prime amplifier 15, lock-in amplifier 16, digital to analog converter 17, DSP data transmitter 18, stepper motor 19, laser instrument 21 and the on-the-spot controller 6 that detects are formed; The draft tube 24 of photoacoustic cell 11 is connected with the valve of Gas controller 10 respectively with escape pipe 25, gas circuit controller 10 is electrically connected with the on-the-spot controller 6 that detects, laser instrument 21, photomodulator 14 is formed light path with optical filter 13, stepper motor 19 control optical filters 13 move to the light inlet 22 of photoacoustic cell 11, stepper motor 19 is electrically connected with the on-the-spot controller 6 that detects, photoacoustic cell 11 outer walls are connected with microphone 12, microphone 12 is electrically connected with prime amplifier 15, prime amplifier 15 is electrically connected with lock-in amplifier 16, lock-in amplifier 16 is electrically connected with digital to analog converter 17 and laser instrument 21, digital to analog converter 17 is electrically connected with DSP data transmitter 18, DSP data transmitter 18 is connected with data collection process server 7 through Lon Works network 2 by data telecommunication line 20, and the side's of station monitoring system is connected through the database server 4 of TCP/IP network 3 with square tube reason system of office; On-the-spot detection controller 6, the side's of station monitoring system drawn game square tube reason system are equipped with relevant special software.
Here, the oil-gas separator 9 main sampling functions that realize the transformer oil dissolved gas, it adopts up-to-date vacuum quantitative degas method to outgas, its degassing rate is up to 98%, the degassing time is short, as long as 30 minutes, and has intercepted water effectively and enters photoacoustic cell 11 and produce cross influences, it is long to have solved the time of the gas and oil separating plant degassing in the past, the shortcoming of repeatable difference; Gas circuit controller 10 is got the photoacoustic cell 11 that quantitative sample gas is delivered to the photo-acoustic detection system equably to the sample gas after the gas-oil separation, adopts electromagnetic valve when being connected with escape pipe 25 with draft tube 24 in the gas circuit controller 10, and it is fast to open the shut-in time, the automaticity height; Its laser instrument 21 adopts the incoherent wide light source of far infrared, and wavelength unit is 2-20 μ m, can effectively cover spectrum (the characteristic wavelength 4.651 μ m-14.97 μ m that oil chromatography need detect of Gas in Oil of Transformer.); Its photo-acoustic detection device adopts capacitor type electret microphone 12, and its sensitivity drift can guarantee in 200 years less than 1% under normal temperature condition.Measuring accuracy can reach 10mv/mP, and for example the EK-23024 of knowles company has high sensitivity and noise resisting ability; Its on-the-spot controller 6 that detects adopts industrial computer; Its stepper motor 19 adopts miniature pulse motor, by the on-the-spot instruction operation that detects controller 6.
The design feature of the photoacoustic cell 11 that adopts is: can detect multicomponent gas and low ground unrest, acoustic energy loss, thereby improve the sensitivity of the detection that makes the raising system.Figure 3 shows that the structure of photoacoustic cell 11, photoacoustic cell 11 employings here are cylindrical, and material uses the bigger brass of heat-conduction coefficient, and long L is 200mm, radius is 40mm, the vibration tube radius is 5mm, has resonance characteristics, and it has light inlet 22, light-emitting window 26, draft tube 24 and escape pipe 25 are arranged, be provided with two acoustic filters 23 between light inlet 22 and the draft tube 24 and between light-emitting window 26 and the escape pipe 25, it can filter ground unrest, improves precision.Opening escape pipe 25 gets rid of the waste gas of photoacoustic cell 11, ensured the purity of detected gas, this photoacoustic cell 11 is operated in 100 rank longitudinal resonance states, in this pattern, inhibition noise signal that can be bigger, and microphone 12 is placed on the antinodal point of photoacoustic cell 11, can greatly improve the signal amplitude of microphone 12 like this and suppress noise.The outlet of draft tube 24 should be chosen in the 0.628R place of photoacoustic cell 11 radiuses.
The system of above-mentioned utilization spectrum optoacoustic on-line monitoring Gas in Oil of Transformer content, its method of work is: vacuum oil gas separating device 9 is isolated the gas in the transformer oil, intercepting water enters in the gas, gas circuit controller 10 is opened the gas circuit valve under monitor controller 6 controls at the scene, this gas is sent into photoacoustic cell 11 through the gas circuit valve, gas circuit controller 10 detects controller 6 control ShiShimonoseki road valve of holding one's breath at the scene then, the laser that far-infrared laser 21 produces projects optical filter 13 after photomodulator 14 modulation, stepper motor 19 detects the instruction of controller 6 according to the scene, the optical filter 13 that need are surveyed the gaseous spectrum characteristic wavelength is delivered to the light inlet 22 of photoacoustic cell 11, laser after the modulation is through the gas of this optical filter 13 through 11 li of light inlet 22 radiation photoacoustic cells, gas absorption luminous energy expands, produce ultrasound wave, high sensitivity microphone 12 on photoacoustic cell 11 outer walls detects its ultrasonic intensity, detected signal is amplified by prime amplifier 15, after lock-in amplifier 16 amplifies, after carrying out high precision digital-to-analog converter 17 conversions, lock-in amplifier 16 carries out the analysis of optoacoustic phase drift simultaneously, store and be sent to the data collection process server 7 of station side's monitoring system again with high-speed dsp data transmitter 18, supervisory control comuter 1 is handled and sent to 7 pairs of data of data collection process server, show the concentration and corresponding converting equipment numbering and the position that need to survey gas, compare with the threshold values of setting, judge whether to exceed standard, the database server 4 of the data forwarding office square tube reason system after the processing, and when noting abnormalities, give a warning by supervisory control comuter 1 and WEB inquiry workstation 5; By two acoustic filters 23 are set between light inlet 22 and the draft tube 24 and between light-emitting window 26 and the escape pipe 25, filter ground unrest and source noise, also economy-combat is left tracheae 25 and the waste gas of photoacoustic cell 11 is got rid of the promoting the circulation of qi body of going forward side by side is cleaned, ensure the purity of detected gas, adopted above method to guarantee precision and the accuracy that detects; Through above-mentioned process once, detect the concentration of a kind of gas and this gas, at each stepper motor 19 optical filter 13 of gas with various spectral signature is delivered under the prerequisite of photoacoustic cell 11 light inlets 22, just detected multiple gases and concentration in the transformer oil by repeatedly above-mentioned process; Running quality or the fault category and the fault order of severity that just can accurately judge power equipment according to the kind and the concentration of gas; The on-the-spot controller 6 that detects is according to being provided with continuous cycle detection, operation conditions that just can online long term monitoring converting equipment.
In sum, the method and system of utilization spectrum optoacoustic on-line monitoring Gas in Oil of Transformer content, methodological science is reasonable, simple in structure, reliable, the detected gas kind is many, the accuracy of detection height, detection speed is fast, and is workable, can shorten the obstacle duration, maintenance is little, and on-line monitoring is cheap for a long time, use manpower and material resources sparingly, can greatly improve the operational efficiency of power equipment.
Though more than described embodiment of the present utility model, but the one skilled in the art can understand, these only illustrate, and can make numerous variations or modification to these embodiments, and not deviate from principle of the present utility model and essence.Scope of the present utility model is limited by appended claims.
Claims (5)
1, Gas in Oil of Transformer content on-line monitoring system comprises an innings square tube reason system, the side's of station monitoring system, field monitoring system, and its innings square tube reason system is made up of database server, WEB inquiry workstation and TCP/IP network three parts; The side's of station monitoring system is made up of data collection process server, supervisory control comuter and full distributed Based Intelligent Control Lon works network, and the side's of station monitoring system is connected through the database server of TCP/IP network with square tube reason system of office; Its field monitoring system comprises transformer oil valve, oil-gas separator, gas circuit controller, and transformer oil valve one end links to each other with the insulation grease chamber of converting equipment, and an end links to each other with oil-gas separator, and the other end of oil-gas separator is connected with the gas circuit controller; It is characterized in that: the field monitoring system also comprises the photo-acoustic detection system, and the photo-acoustic detection system is made up of photoacoustic cell, microphone, optical filter, photomodulator, illuminator, stepper motor, prime amplifier, lock-in amplifier, digital to analog converter and DSP data transmitter and the on-the-spot controller that detects; The draft tube of photoacoustic cell is connected with the valve of Gas controller respectively with escape pipe, the gas circuit controller is electrically connected with the on-the-spot controller that detects, illuminator, photomodulator and optical filter are formed light path, the step motor control optical filter moves to the light inlet of photoacoustic cell, stepper motor is electrically connected with the on-the-spot controller that detects, the photoacoustic cell outer wall is connected with microphone, microphone is electrically connected with prime amplifier, prime amplifier is electrically connected with lock-in amplifier, lock-in amplifier is electrically connected with digital to analog converter and illuminator, digital to analog converter is electrically connected with the DSP data transmitter, and the DSP data transmitter is connected with the data collection process server through Lon Works network by data telecommunication line.
2, Gas in Oil of Transformer content on-line monitoring system according to claim 1 is characterized in that: between the light inlet and draft tube of photoacoustic cell, all be provided with two acoustic filters between light-emitting window and the escape pipe.
3, Gas in Oil of Transformer content on-line monitoring system according to claim 1 and 2, it is characterized in that: photoacoustic cell is resonant cylindrical, is made by the metal material that heat transfer coefficient is bigger.
4, Gas in Oil of Transformer content on-line monitoring system according to claim 1 and 2 is characterized in that: illuminator is incoherent wide light source, its characteristic wavelength 2-20 μ m.
5, Gas in Oil of Transformer content on-line monitoring system according to claim 1 and 2, it is characterized in that: microphone is the EK-23024 of knowles company, measuring accuracy is 10mv/mP.
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| CN2009200837627U CN201402257Y (en) | 2009-02-20 | 2009-02-20 | Gas content on-line monitoring system in transformer oil |
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| CN101949821A (en) * | 2010-08-12 | 2011-01-19 | 重庆大学 | Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases |
| CN102123164A (en) * | 2010-12-27 | 2011-07-13 | 安徽继远电网技术有限责任公司 | On-line monitoring management system for dissolved gas in transformer oil |
| CN102884413A (en) * | 2010-03-02 | 2013-01-16 | 利康股份有限公司 | Method and apparatus for the photo-acoustic identification and quantification of analyte species in a gaseous or liquid medium |
| CN106290590A (en) * | 2015-05-13 | 2017-01-04 | 湖南大学 | Minimum gas optoacoustic spectroscopy and chromatograph joint used instrument and the method for analysis in insulating oil |
| CN112067556A (en) * | 2020-09-29 | 2020-12-11 | 湖北鑫英泰系统技术股份有限公司 | Oil-gas detection method and device for oil-immersed equipment |
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| CN106290590A (en) * | 2015-05-13 | 2017-01-04 | 湖南大学 | Minimum gas optoacoustic spectroscopy and chromatograph joint used instrument and the method for analysis in insulating oil |
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| CN112504987A (en) * | 2021-02-06 | 2021-03-16 | 湖北鑫英泰系统技术股份有限公司 | Method and system for identifying mixture of gas ethylene and acetylene in transformer oil |
| CN112504987B (en) * | 2021-02-06 | 2021-05-04 | 湖北鑫英泰系统技术股份有限公司 | Method and system for identifying mixture of gas ethylene and acetylene in transformer oil |
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