CN104198393B - SF 6decomposed gas component on-line monitoring system and method in electrical equipment - Google Patents

SF 6decomposed gas component on-line monitoring system and method in electrical equipment Download PDF

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CN104198393B
CN104198393B CN201410174004.1A CN201410174004A CN104198393B CN 104198393 B CN104198393 B CN 104198393B CN 201410174004 A CN201410174004 A CN 201410174004A CN 104198393 B CN104198393 B CN 104198393B
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China
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electromagnetic switch
switch valves
gas
line monitoring
electrical equipment
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CN201410174004.1A
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CN104198393A (en
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张英
张晓星
余鹏程
李军卫
刘恒
蒋震
李新
牧灏
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贵州电力试验研究院
重庆大学
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Abstract

The invention discloses a kind of SF of the present invention 6decomposed gas component on-line monitoring system and method thereof in electrical equipment, it adopts photocaustic spectroscopy to solve SF 6the problem of electrical equipment multiple gases decomposition components on-line monitoring application, achieves multiple SF 6the on-line monitoring of electrical equipment malfunction decomposed gas component.There is the features such as monitor multiple decomposed gas component, antijamming capability is strong, accuracy in detection is high, precision is high and follow-up maintenance is simple simultaneously.

Description

SF 6decomposed gas component on-line monitoring system and method in electrical equipment

Technical field

The present invention relates to on-line monitoring of high-voltage electric equipment technical field, be specifically related to a kind of SF 6decomposed gas component on-line monitoring system and method in electrical equipment.

Background technology

SF 6gas has excellent insulating property, is widely used in high voltage electric equipment.Operating SF 6electrical equipment due to manufacture, install, run time inside may there is various defect, discharge (arc discharge, spark discharge, corona or shelf depreciation) and overheating fault, cause SF 6gas decomposes, and generates various gas composition, mainly contains SF 4, SOF 2, SO 2f 2, SOF 4, SO 2, CO, H 2s, HF and CF 4deng.For operating electrical equipment, analyze and detect SF 6the decomposition product of gas judges SF 6strong means of air insulating device internal operation situation, the diversification of offline inspection analysis means, mainly comprises chromatography, infrared absorption method, photocaustic spectroscopy, ultraviolet fluorescence method, electrochemical sensor method and detects tube method.

Wherein, infrared absorption spectroscopy and photocaustic spectroscopy are all the detections realizing gas to be measured based on the physical phenomenon that the infrared light generation absorption of gas molecule and specific wavelength is adjoint, and all have antijamming capability strong, to advantages such as same sample repeatedly detect, SF can be specially adapted to 6the on-line monitoring of decomposition gas.But compare photocaustic spectroscopy, infrared absorption spectroscopy requires higher to absorption light path, and absorb air chamber comparatively large, the sample needed during detection is large-minded, and need to compare transmitted light intensity and incident intensity to determine the uptake of gas to light, constrain accuracy of detection greatly.Optoacoustic spectroscopy is the spectral technique based on optoacoustic effect, optoacoustic effect is produced by the infrared radiation of gas molecules sorb specific wavelength, excited state is entered by ground state after the infrared light of gas molecules sorb specific wavelength, immediately to discharge the mode de excitation of heat energy, the heat energy discharged makes gas produce pressure wave, the proportional relation of concentration of pressure wave intensity and gas molecule, Inversion Calculation can obtain the concentration of gas to be measured by detected pressures wave intensity.Optoacoustic spectroscopy directly can measure uptake, greatly improve detection sensitivity and degree of accuracy, by using resonant mode photoacoustic cell, greatly can reduce the volume of photoacoustic cell, also reduce the demand to sample tolerance simultaneously, safeguard simple, be suitable for the on-line monitoring of multiple gases decomposition components in electrical equipment.In conjunction with actual field testing result and bibliographical information, SF 6the gas decomposition components of over-heat inside electric appliance and discharge fault outbalance mainly contains SO 2, H 2s, CF 4with CO tetra-kinds of gas compositions.Utilize photocaustic spectroscopy to multiple SF 6the composition of decomposition components gas and content thereof carry out Real-Time Monitoring, and for measurement electric discharge and overheating fault aggregate level, development trend, trouble-saving generation, ensures that the safe operation of power equipment has important effect.

The photoacoustic detection device of decomposition components and method under existing sulfur hexafluoride shelf depreciation, as bulletin on June 13rd, 2012, Authorization Notice No. is the patent " under shelf depreciation the infrared photoacoustic spectra pick-up unit of sulfur hexafluoride decomposition components and method " of " CN 101982759 B ".The main device of the infrared photoacoustic spectra system in this patent has: wide range infrared light supply, zinc selenide lens, chopper, optical filter wheel, photoacoustic cell, microphone, temperature sensor, lock-in amplifier etc.Disclosed method is taken turns by rotating filtering sheet, selectivity is through the modulated infrared light of the different-waveband corresponding to different decomposition component, and use mechanical chopper to modulate it, by detecting the weak acoustic signal that decomposition components produces in photoacoustic cell internal cause optoacoustic effect, realize the detection to different component.The weak point of this patent is:

(1) optical filter mainly adopt coating technique to infrared light carry out selectivity through, when adopting optical filter to carry out wavelength chooses to infrared light, the infrared light live width of transmission is wider, can cause cross jamming, need to carry out secondary treating to data, be unfavorable for field quick detection.

(2) to rotate the mechanical noise caused identical with photoacoustic signal frequency for mechanical chopper, increase the system noise of photo-acoustic detection, generation acoustic disturbance and chopping frequency rock and cause acoustical signal to rise and fall in atmosphere, the frequency dependence of its frequency and photoacoustic signal, and turbulent noise increases rapidly along with the increase of chopping frequency, these factors all have a strong impact on the detection signal-to-noise ratio of photoacoustic signal, thus reduce the detection sensitivity to gas composition.

(3) this system can not directly be connected with GIS device, need the gas sampling steel cylinder in GIS device or gas production bag to take out when detecting, be injected in optoacoustic spectroscopy pick-up unit, add the complicacy of detection, fail to realize the on-line monitoring to equipment, not only need to consume SF 6gas, also can cause SF 6outer row.

In addition, the application publication number announced on October 10th, 2012 is patent " the portable SF of " CN 102721645 A " 6gas analyte optoacoustic spectroscopy pick-up unit and detection method ".The main device of this patent has: metal shell, parabola post mirror, infrared light supply, chopper, optical filter wheel, photoacoustic cell, pressure transducer, microphone, lock-in amplifier etc.Focused on by parabolic lens, chopper is modulated, optical filter wheel is selected, and launches specific wavelength focused IR light in photoacoustic cell, thus detect the decomposition gas of different component.This patent processes cross jamming, but still has the following disadvantages:

(1) optical filter mainly adopt coating technique to infrared light carry out selectivity through, when adopting optical filter to carry out wavelength chooses to infrared light, the infrared light live width of transmission is wider, cross jamming can be caused, although adopt the methods such as support vector machine to reduce the impact of cross jamming, cross jamming impact does not fundamentally overcome.

(2) chopper is adopted to adjust light, the noise produced when could not solve chopper work.

(3) can not be directly connected on GIS device and detect gas, same exist and can not realize on-line monitoring, and can loss SF 6gas is the outer problem being discharged to environment also.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of SF 6the SF that inside electric appliance fault produces 6decomposed gas component on-line monitoring system and method thereof, can to inside electric appliance SF 6the content of characteristics of decomposition component carries out real time on-line monitoring, have monitor various ingredients simultaneously, without air-loss, pollution-free, antijamming capability is strong, accuracy in detection is high, accuracy of detection is high and the feature such as convenient operation follow-up maintenance.

The technical scheme of the object of the invention is: SF 6decomposed gas component on-line monitoring system in electrical equipment, during detection, it is connected to SF 6electrical equipment get on cyclostrophic interface, its detection system comprises infrared photo acoustic gas sensor, the outlet getting gas interface is connected with in turn manually-operated gate and three-way connection, another two outlets of three-way connection are connected with the two ends of gas detect pipeline respectively, and gas detect pipeline is serially connected with gas pressure reducer, No. seven electromagnetic switch valves, buffer air chamber, ten No. two electromagnetic switch valves, infrared photo acoustic gas sensor, ten No. five electromagnetic switch valves, force (forcing) pump and one-way cocks successively; The pipeline of No. seven grafting between electromagnetic switch valve and buffer air chamber on gas detect pipeline is connected with No. eight electromagnetic switch valves, be connected with ten No. three electromagnetic switch valves and ten No. four electromagnetic switch valves in the air inlet side of ten No. two electromagnetic switch valves and the air inlet side of ten No. five electromagnetic switch valves, between ten No. three electromagnetic switch valves and ten No. four electromagnetic switch valves, be provided with pressure transducer; The pipeline of grafting between pressurizing valve and one-way cock is connected with No. six electromagnetic switch valves and force (forcing) pump; Its electrical equipment is controlled by control module.

Above-mentioned SF 6in electrical equipment, decomposed gas component on-line monitoring system is, after getting the outlet manually-operated gate of cyclostrophic interface, be serially connected with anti-dust filter mesh.

Aforesaid SF 6in electrical equipment, decomposed gas component on-line monitoring system is, described cyclostrophic interface of getting is crossover tee, and first interface is communicated with the self-sealing gas supplementing opening of gas-filled type current transformer; Second interface is self-sealing interface, and one end connects electrical equipment air hatch, the manually-operated gate described in the other end connects.

Aforesaid SF 6in electrical equipment, decomposed gas component on-line monitoring system is, is connected to permanent flow valve in the import and export of infrared photo acoustic gas sensor.

Aforesaid SF 6in electrical equipment, decomposed gas component on-line monitoring system is, infrared photo acoustic sensor comprises infrared laser group, optical-fiber bundling device, photoacoustic cell, line drip catcher, microphone, lock-in amplify module and industrial computer composition, described infrared laser group is made up of multiple infrared laser possessing electrical modulation function, and each infrared laser all can send for a certain specific SF 6the infrared laser of the super-narrow line width of decomposition components absorption peak, by the detection to different component photoacoustic signal, is finally inversed by the volume fraction of each component; The infrared laser of the super-narrow line width that multiple infrared laser exports by described optical-fiber bundling device is coupled in a branch of optical fiber through multiple beams of optical fiber and carries out and light; Ensure that the laser only having an infrared laser to export at synchronization can inject photoacoustic cell by controlling infrared laser appliance mains switch; Described photoacoustic cell is the longitudinal resonant mode photoacoustic cell of single order, is the container that photoacoustic signal produces; Described microphone is for detecting the weak acoustic signal after photoacoustic cell resonance amplifies, survey frequency scope 20Hz ~ 20kHz, sensitivity 50mV/Pa; Described lock-in amplify module, in measuring characteristic frequency acoustical signal, reduces the interference of other frequency noises, measurement range 2nV ~ 1V, survey frequency scope 10 -3hz ~ 102.4kHz; Described line drip catcher is the iron sheet metal of black of thickness 1-2mm, and it can absorb the infrared laser transmitted from photoacoustic cell.

Aforesaid SF 6in electrical equipment, decomposed gas component on-line monitoring system is, described control module is made up of driver module and industrial computer, driver module is for being incorporated into control and the feedback information of each electrical components in line monitoring system, and coordinate industrial computer, realize the Automated condtrol to whole on-line monitoring system; Industrial computer is used for Long-distance Control driver module, realizes the Automated condtrol of on-line monitoring system.

SF 6in electrical equipment, the method for decomposed gas component on-line monitoring is, to SF 6inside electric appliance electric discharge or overheating fault produce SF 6the content of characteristics of decomposition component carries out real time on-line monitoring, and concrete steps are as follows:

(1) on-line monitoring system impermeability is checked

Close manually-operated gate, control driver module by industrial computer and close No. eight electromagnetic switch valves, open No. seven electromagnetic switch valves, ten No. two electromagnetic switch valves, ten No. three electromagnetic switch valves, ten No. four electromagnetic switch valves, ten No. five electromagnetic switch valves, open vacuum pump more successively and No. six electromagnetic switch valves vacuumize whole on-line monitoring system, and control driver module by industrial computer and obtain the whole on-line monitoring system internal pressure value that records of pressure transducer, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves and vacuum pump successively, and maintain this state 60 minutes, if pressure increase value is less than 0.05%, then think that system impermeability is good, lower step system proving operation can be carried out, otherwise, think that system impermeability is bad, answering system overhauls,

(2) to the demarcation of on-line monitoring system

When carry out (1) step vacuum pumping meet impermeability intact, by SF 6the calibrating gas of gas decomposition components known volume mark accesses the vacant port of No. eight electromagnetic switch valves, No. eight electromagnetic switch valves are opened in control, ten No. three electromagnetic switch valves, control to close other electromagnetic switch valves, calibrating gas is filled with to buffer air chamber, 0.14-0.15Mpa is reached to buffer air chamber internal pressure, control closedown No. eight electromagnetic switch valves successively, ten No. three electromagnetic switch valves, ten No. two electromagnetic switch valves are opened in control, ten No. four electromagnetic switch valves, infrared photo acoustic gas sensor is inflated, when infrared optoacoustic gas sensor internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves, ten No. four electromagnetic switch valves, by set up infrared photo acoustic gas sensor signal intensity and survey quantitative relationship between gas volume fraction, complete the demarcation of on-line monitoring system,

(3) gas washing process is carried out to on-line monitoring system

After (2) step completes, repeat vacuum pumping in (1) step, then by pure SF 6gas accesses the vacant port of No. eight electromagnetic switch valves, manually-operated gate is kept to close, No. seven electromagnetic switch valves, No. eight electromagnetic switch valves, ten No. two electromagnetic switch valves, ten No. three electromagnetic switch valves, ten No. four electromagnetic switch valves, ten No. five electromagnetic switch valves are opened in control, are filled with pure SF to whole monitoring system 6gas reaches 0.2Mpa to monitoring system internal pressure, closes No. eight electromagnetic switch valves, and leaves standstill 10 minutes, repeats above operation 3 times, namely completes the gas washing process to on-line monitoring system;

(4) operation of on-line monitoring system

After completing (3) step, manually-operated gate is kept to close, control driver module by industrial computer and close No. eight electromagnetic switch valves, open No. seven electromagnetic switch valves, ten No. two electromagnetic switch valves, ten No. three electromagnetic switch valves, ten No. four electromagnetic switch valves, ten No. five electromagnetic switch valves, open vacuum pump more successively and No. six electromagnetic switch valves vacuumize whole on-line monitoring system, and control driver module by industrial computer and obtain the whole on-line monitoring system internal pressure value that records of pressure transducer, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves and vacuum pump successively, control closedown No. seven electromagnetic switch valves again, ten No. two electromagnetic switch valves, ten No. three electromagnetic switch valves, ten No. four electromagnetic switch valves, ten No. five electromagnetic switch valves, then manually-operated gate is opened, on-line monitoring system is accessed SF 6electrical equipment, No. seven electromagnetic switch valves, ten No. three electromagnetic switch valves are opened in control, are filled with inside electric appliance SF to buffer air chamber 6gas, 0.14-0.15Mpa is reached to buffer air chamber internal pressure, control closedown No. seven electromagnetic switch valves, ten No. three electromagnetic switch valves, ten No. two electromagnetic switch valves are opened in control, ten No. four electromagnetic switch valves, infrared photo acoustic gas sensor is inflated, when infrared optoacoustic gas sensor internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves, ten No. four electromagnetic switch valves, the signal intensity being back to the infrared photo acoustic gas sensor of industrial computer by control module is scaled to surveyed feature decomposition volume components mark, when feature decomposition volume components mark exceedes predetermined threshold value, namely to alert personnel, in feature decomposition component testing process, the power supply being controlled different laser instruments by industrial computer and driver module carries out operation of opening the light, guarantee have at synchronization and only have a laser instrument in running order, then from optical-fiber bundling device export laser only for a certain special characteristic component, by the time-sharing multiplex to optical fiber and photoacoustic cell, realize quantitatively detecting one by one various features decomposition components in photoacoustic cell, after infrared optoacoustic gas sensor completes this detection, control to open ten No. two electromagnetic switch valves, ten No. four electromagnetic switch valves, ten No. five electromagnetic switch valves and force (forcing) pumps, force (forcing) pump work makes the SF of infrared photo acoustic gas sensor and buffer air chamber inside 6gas is through one-way cock, and anti-dust filter mesh, manually-operated gate, gets cyclostrophic interface and be sent back to SF 6electrical equipment, when pressure transducer rreturn value is lower than-98kPa, controls to cut out ten No. five electromagnetic switch valves, ten No. two electromagnetic switch valves, ten No. four electromagnetic switch valves successively, now infrared photo acoustic gas sensor and the inner SF of buffer air chamber 6gas is sent back to electrical equipment, and its inner maintenance vacuum state, to detect use next time.

In case of maintenance or other fortuitous events need be closed in line monitoring system, manual-lock manually-operated gate, the physical connection of on-line monitoring system and electrical equipment is cut off, and after gas washing process being carried out to on-line monitoring system according to step, close whole system.

compared with the prior art,the present invention adopts photocaustic spectroscopy to solve SF 6the problem of electrical equipment multiple gases decomposition components on-line monitoring application, achieves multiple SF 6the on-line monitoring of electrical equipment malfunction decomposed gas component.There is the features such as monitor multiple decomposed gas component, antijamming capability is strong, accuracy in detection is high, precision is high and follow-up maintenance is simple simultaneously.

Be provided with gas circuit of automatically sampling, industrial computer cooperation driver module control sampling gas circuit is directly also fed in rapidly line monitoring system from equipment sampling and detects, and sends sample gas back to electrical equipment by gas circuit after testing process completes.Achieve device interior SF 6the robotization real-time online of gas decomposition components detects, avoid use gas production bag or steel cylinder from equipment get the impurity introduced gas process and getting gas, in this time period of censorship because the component detection error that causes of the various chemical reactions of sample gas, and do not consume sample gas.

Use infrared laser group as light source, line width, can be good at the problem solving cross jamming between different component, driver module is coordinated accurately to control the switch of different wave length infrared laser by industrial computer, to the time-sharing multiplex of optical-fiber bundling device light path and photoacoustic cell, realize the detection of various features decomposition components in the testing process of same sample.Infrared laser adopts the mode of electrical modulation, avoids the noise brought by optical chopper mechanical vibration.

By to the Stress control of buffer air chamber and installing additional of permanent flow valve; gas in on-line monitoring system is made to be filled with the process of infrared photo acoustic gas sensor milder; protect the accurate device of infrared photo acoustic gas sensor photoacoustic cell inside to the full extent; shorten gas and stablize required time in infrared gas sensor; reduce the error brought because of infrared photo acoustic gas sensor interior pressure and flow velocity factor, to ensure accuracy and the accuracy of detection of infrared photo acoustic gas sensor.Extend the serviceable life of force (forcing) pump and infrared photo acoustic gas sensor simultaneously.

Patent of the present invention can detect SO 2, H 2s, CF 4with CO tetra-kinds of decomposed gas components, but the scope contained is not limited to this four kinds of decomposed gas components.

Accompanying drawing explanation

Fig. 1 is the structural representation of invention;

Fig. 2 is infrared laser optoacoustic gas sensor schematic diagram of the present invention.

In Fig. 1: 1, get cyclostrophic interface; 2, manually-operated gate; 3, anti-dust filter mesh; 4, gas pressure reducer; 5, one-way cock; 6, No. six electromagnetic switch valves; 7, No. seven electromagnetic switch valves; 8, No. eight electromagnetic switch valves; 12, ten No. two electromagnetic switch valves; 13, ten No. three electromagnetic switch valves; 14, ten No. four electromagnetic switch valves; 15, ten No. five electromagnetic switch valves; 9, buffer air chamber; 10, vacuum pump; 11, force (forcing) pump; 16, pressure transducer; 17, permanent flow valve; 18, gas detect pipeline; 19, infrared photo acoustic gas sensor; 20, driver module; 21, industrial computer.

In Fig. 2: 22, lock-in amplify module; 23, infrared laser group; 24, optical-fiber bundling device; 25, photoacoustic cell; 26, microphone; 27, line drip catcher.

Embodiment

Embodiment 1, during detection, it is connected to SF 6electrical equipment get on cyclostrophic interface 1, the outlet getting gas interface 1 is connected with in turn manually-operated gate 2, anti-dust filter mesh 3 and three-way connection, another two outlets of three-way connection are connected with the two ends of gas detect pipeline 18 respectively, and gas detect pipeline 18 is serially connected with gas pressure reducer 4, No. seven electromagnetic switch valves 7, buffer air chamber 9, ten No. two electromagnetic switch valves 12, infrared photo acoustic gas sensor 19, ten No. five electromagnetic switch valves 15, force (forcing) pump 11 and one-way cocks 5 successively; The pipeline of grafting between No. seven electromagnetic switch valves 7 and buffer air chamber 9 on gas detect pipeline 28 is connected with No. eight electromagnetic switch valves 8, be connected with ten No. three electromagnetic switch valves 13 and ten No. four electromagnetic switch valves 14 in the air inlet side of ten No. two electromagnetic switch valves 12 and the air inlet side of ten No. five electromagnetic switch valves 15, between ten No. three electromagnetic switch valves 13 and ten No. four electromagnetic switch valves 14, be provided with pressure transducer 16; The pipeline of grafting between pressurizing valve 11 and one-way cock 5 is connected with No. six electromagnetic switch valves 6 and force (forcing) pump 11; Its electrical equipment is controlled by control module.

In said system, the setting of anti-dust filter mesh 3 is used for preventing SF 6in equipment, granule impurity enters detection system, and gas pressure reducer 4, for reducing the air pressure from electrical equipment body eluting gas, in order to other equipment in protection system, and meets the pressure condition required by detecting; Buffer air chamber 9 is rectangular parallelepiped, and gas, after electromagnetic switch valve, keeps internal pressure in this interval of 0.14-0.15Mpa, to meet the voltage stabilizing needs that optoacoustic spectroscopy detects unit at buffer air chamber; Vacuum pump 10 is for vacuumizing whole on-line monitoring system; The setting of force (forcing) pump 11 is used for sending the gas detected back to electrical equipment body.It is milder that permanent flow valve 17 makes gas be filled with the process of infrared photo acoustic gas sensor 19; detect components and parts to protect photoacoustic cell 25 internal precision not damage because of photoacoustic cell 25 air pressure inside cataclysm; reduce gas stable required time in photoacoustic cell simultaneously; accelerate detection speed, pressure transducer 16 is for pressure in monitoring system.

Described infrared photo acoustic sensor is the gas detection cell based on optoacoustic spectroscopy theory developed voluntarily, is the core component of whole system; Infrared photo acoustic sensor 19 comprises infrared laser group 23, optical-fiber bundling device 24, photoacoustic cell 25, line drip catcher 27, microphone 26, lock-in amplify module 22 and industrial computer 21 and forms, by the detection to different component photoacoustic signal, be finally inversed by the volume fraction of each component; Infrared laser group 23 is made up of multiple infrared laser possessing electrical modulation function, and each infrared laser all can send for a certain specific SF 6the infrared laser of the super-narrow line width of decomposition components absorption peak, effectively avoids the cross jamming that different component detects, has good single detection; Optical-fiber bundling device 24, the infrared laser of the super-narrow line width that multiple infrared laser can be exported is coupled in a branch of optical fiber through multiple beams of optical fiber, reaches the effect of closing light.By controlling infrared laser appliance mains switch, can ensure have at synchronization and only have the laser of an infrared laser output can inject photoacoustic cell 25.The longitudinal resonant mode photoacoustic cell of single order that described photoacoustic cell 25 is developed voluntarily for laboratory, it is the container that photoacoustic signal produces, by the appropriate design of structure, resonance amplification is carried out to the photoacoustic signal of characteristic frequency, be convenient to microphone and the photoacoustic signal after amplification is detected; Microphone 26 is for detecting the weak acoustic signal after photoacoustic cell resonance amplifies, survey frequency scope 20Hz ~ 20kHz, sensitivity 50mV/Pa; Lock-in amplify module 22 is measured characteristic frequency acoustical signal for realizing, and reduces the interference of other frequency noises, measurement range 2nV ~ 1V, survey frequency scope 10 -3hz ~ 102.4kHz; Line drip catcher 27 is the iron sheet metal of black of thickness 1-2mm, can be rectangle or circle, its major function absorbs the infrared laser transmitted from photoacoustic cell, avoids infrared laser to be radiated at described infrared photo acoustic sensor internal for a long time, cause damage to equipment.

Described control module is made up of driver module 20 and industrial computer 21, the driving circuit version that driver module 20 makes for designed, designed, for being incorporated into control and the feedback information of each electrical components in line monitoring system, and coordinate industrial computer 21, realize the Automated condtrol to whole on-line monitoring system; Industrial computer 21, for Long-distance Control driver module 20, realizes the Automated condtrol of on-line monitoring system.

After the connection completing the said equipment and assembling, to SF 6inside electric appliance electric discharge or overheating fault produce SF 6the concrete steps that characteristics of decomposition component concentration carries out real time on-line monitoring are as follows:

(1) on-line monitoring system impermeability is checked

Close manually-operated gate 2, control driver module 20 by industrial computer 21 and close No. eight electromagnetic switch valves 8, open No. seven electromagnetic switch valves 7, ten No. two electromagnetic switch valves 12, ten No. three electromagnetic switch valves 13, ten No. four electromagnetic switch valves 14, ten No. five electromagnetic switch valves 15, open vacuum pump 10 more successively and No. six electromagnetic switch valves 6 vacuumize whole on-line monitoring system, and control driver module 20 by industrial computer 21 and obtain the whole on-line monitoring system internal pressure value that pressure transducer 16 records, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves 6 and vacuum pump 10 successively, and maintain this state 60 minutes, if pressure increase value is less than 0.05%, then think that system impermeability is good, lower step system proving operation can be carried out, otherwise, think that system impermeability is bad, answering system overhauls,

(2) to the demarcation of on-line monitoring system

When carry out the 1st step vacuum pumping meet impermeability intact, by SF 6the calibrating gas of gas decomposition components known volume mark accesses the vacant port of No. eight electromagnetic switch valves 8, No. eight electromagnetic switch valves 8 are opened in control, ten No. three electromagnetic switch valves 13, control to close other electromagnetic switch valves, calibrating gas is filled with to buffer air chamber 9, 0.14-0.15Mpa is reached to buffer air chamber 9 internal pressure, control closedown No. eight electromagnetic switch valves 8 successively, ten No. three electromagnetic switch valves 13, ten No. two electromagnetic switch valves 12 are opened in control, ten No. four electromagnetic switch valves 14, infrared photo acoustic gas sensor 19 is inflated, when infrared optoacoustic gas sensor 19 internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves 12, ten No. four electromagnetic switch valves 14, by set up infrared photo acoustic gas sensor 19 signal intensity and survey quantitative relationship between gas volume fraction, complete the demarcation of on-line monitoring system,

(3) gas washing process is carried out to on-line monitoring system

After (2) step completes, repeat vacuum pumping in (1) step, then by pure SF 6gas accesses the vacant port of No. eight electromagnetic switch valves 8, manually-operated gate 2 is kept to close, No. seven electromagnetic switch valves 7, No. eight electromagnetic switch valves 8, ten No. two electromagnetic switch valves 12, ten No. three electromagnetic switch valves 13, ten No. four electromagnetic switch valves 14, ten No. five electromagnetic switch valves 15 are opened in control, are filled with pure SF to whole monitoring system 6gas reaches 0.2Mpa to monitoring system internal pressure, closes No. eight electromagnetic switch valves 8, and leaves standstill 10 minutes, repeats above operation 3 times, namely completes the gas washing process to on-line monitoring system;

(4) operation of on-line monitoring system

After completing (3) step, manually-operated gate 2 is kept to close, control driver module 20 by industrial computer 21 and close No. eight electromagnetic switch valves 8, open No. seven electromagnetic switch valves 7, ten No. two electromagnetic switch valves 12, ten No. three electromagnetic switch valves 13, ten No. four electromagnetic switch valves 14, ten No. five electromagnetic switch valves 15, open vacuum pump 10 more successively and No. six electromagnetic switch valves 6 vacuumize whole on-line monitoring system, and control driver module 20 by industrial computer 21 and obtain the whole on-line monitoring system internal pressure value that pressure transducer 16 records, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves 6 and vacuum pump 10 successively, control closedown No. seven electromagnetic switch valves 7 again, ten No. two electromagnetic switch valves 12, ten No. three electromagnetic switch valves 13, ten No. four electromagnetic switch valves 14, ten No. five electromagnetic switch valves 15, then manually-operated gate 2 is opened, on-line monitoring system is accessed SF 6electrical equipment, No. seven electromagnetic switch valves 7, ten No. three electromagnetic switch valves 13 are opened in control, are filled with inside electric appliance SF to buffer air chamber 9 6gas, 0.14-0.15Mpa is reached to buffer air chamber 9 internal pressure, control closedown No. seven electromagnetic switch valves 7, ten No. three electromagnetic switch valves 13, ten No. two electromagnetic switch valves 12 are opened in control, ten No. four electromagnetic switch valves 14, infrared photo acoustic gas sensor 19 is inflated, when infrared optoacoustic gas sensor 19 internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves 12, ten No. four electromagnetic switch valves 14, the signal intensity being back to the infrared photo acoustic gas sensor 19 of industrial computer 21 by control module 20 is scaled to surveyed feature decomposition volume components mark, when feature decomposition volume components mark exceedes predetermined threshold value, namely to alert personnel, in feature decomposition component testing process, the power supply being controlled different laser instruments by industrial computer 21 and driver module 20 carries out operation of opening the light, guarantee have at synchronization and only have a laser instrument in running order, then from optical-fiber bundling device export laser only for a certain special characteristic component, by the time-sharing multiplex to optical fiber and photoacoustic cell, realize quantitatively detecting one by one various features decomposition components in photoacoustic cell, after infrared optoacoustic gas sensor 19 completes this detection, ten No. two electromagnetic switch valves, 12, ten No. four electromagnetic switch valves, 14, ten No. five electromagnetic switch valves 15 and force (forcing) pump 11 are opened in control, and force (forcing) pump 11 work makes the SF of infrared photo acoustic gas sensor 19 and buffer air chamber 9 inside 6gas is through one-way cock 5, and anti-dust filter mesh 3, manually-operated gate 2, gets cyclostrophic interface 1 and be sent back to SF 6electrical equipment, when pressure transducer 16 rreturn value is lower than-98kPa, controls to cut out ten No. five electromagnetic switch valves, 15, ten No. two electromagnetic switch valves, 12, ten No. four electromagnetic switch valves 14, now infrared photo acoustic gas sensor 19 and the inner SF of buffer air chamber 9 successively 6gas is sent back to electrical equipment, and its inner maintenance vacuum state, to detect use next time.

(5) in case of maintenance or other fortuitous events need be closed in line monitoring system, manual-lock manually-operated gate 2, the physical connection of on-line monitoring system and electrical equipment is cut off, and after gas washing process being carried out to on-line monitoring system according to step (3), closes whole system.

In above-mentioned steps, permanent flow valve 17 is in normally open all the time, gas flow rate in stable infrared optoacoustic gas sensor.

Claims (8)

1. the system of decomposed gas component in an on-line monitoring SF6 electrical equipment, what during detection, it was connected to SF6 electrical equipment gets on cyclostrophic interface (1), its detection system comprises infrared photo acoustic gas sensor (19), the outlet getting gas interface (1) is connected with in turn manually-operated gate (2) and three-way connection, another two outlets of three-way connection are connected with the two ends of gas detect pipeline (18) respectively, gas detect pipeline (18) is serially connected with gas pressure reducer (4) successively, No. seven electromagnetic switch valves (7), buffer air chamber (9), ten No. two electromagnetic switch valves (12), infrared photo acoustic gas sensor (19), ten No. five electromagnetic switch valves (15), force (forcing) pump (11) and one-way cock (5), the pipeline of grafting between upper No. seven electromagnetic switch valves (7) of gas detect pipeline (18) and buffer air chamber (9) is connected with No. eight electromagnetic switch valves (8), be connected with ten No. three electromagnetic switch valves (13) and ten No. four electromagnetic switch valves (14) in the air inlet side of ten No. two electromagnetic switch valves (12) and the air inlet side of ten No. five electromagnetic switch valves (15), between No. three electromagnetic switch valves (13) and ten No. four electromagnetic switch valves (14), be provided with pressure transducer (16), the pipeline of grafting between pressurizing valve (11) and one-way cock (5) is connected with No. six electromagnetic switch valves (6) and force (forcing) pump (11), its electrical equipment is controlled by control module, it is characterized in that: described infrared photo acoustic sensor (19) comprises infrared laser group (23), optical-fiber bundling device (24), photoacoustic cell (25), line drip catcher (27), microphone (26), lock-in amplify module (22) and industrial computer (21) composition, described infrared laser group (23) is made up of multiple infrared laser possessing electrical modulation function, each infrared laser all can send the infrared laser of the super-narrow line width for a certain specific SF6 decomposition components absorption peak, by the detection to different component photoacoustic signal, be finally inversed by the volume fraction of each component, the infrared laser of the super-narrow line width that multiple infrared laser exports by described optical-fiber bundling device (24) is coupled in a branch of optical fiber through multiple beams of optical fiber and carries out and light, ensure that the laser only having an infrared laser to export at synchronization can inject photoacoustic cell by controlling infrared laser appliance mains switch, described photoacoustic cell (25) is the longitudinal resonant mode photoacoustic cell of real single order, is the container that photoacoustic signal produces, described microphone (26) is for detecting the weak acoustic signal after photoacoustic cell resonance amplifies, survey frequency scope 20Hz ~ 20kHz, sensitivity 50mV/Pa, described lock-in amplify module (22), for measuring characteristic frequency acoustical signal, reduces the interference of other frequency noises, measurement range 2nV ~ 1V, survey frequency scope 10-3Hz ~ 102.4kHz, the iron sheet metal of black that described line drip catcher (27) is thickness 1-2mm, it can absorb the infrared laser transmitted from photoacoustic cell.
2. the system of decomposed gas component in on-line monitoring SF6 electrical equipment according to claim 1, is characterized in that: after getting the outlet manually-operated gate (2) of cyclostrophic interface (1), be serially connected with anti-dust filter mesh (3).
3. the system of decomposed gas component in on-line monitoring SF6 electrical equipment according to claim 1 and 2, is characterized in that: described cyclostrophic interface (1) of getting is crossover tee, and first interface is communicated with the self-sealing gas supplementing opening of gas-filled type current transformer; Second interface is self-sealing interface, and one end connects electrical equipment air hatch, the manually-operated gate (2) described in the other end connects.
4. the system of decomposed gas component in on-line monitoring SF6 electrical equipment according to claim 1, is characterized in that: be connected to permanent flow valve (17) in the import and export of infrared photo acoustic gas sensor (19).
5. the system of decomposed gas component in on-line monitoring SF6 electrical equipment according to claim 1, it is characterized in that: described electrical equipment is made up of driver module (20) and industrial computer (21) control module, driver module (20) is for being incorporated into control and the feedback information of each electrical components in line monitoring system, and coordinate industrial computer (21), realize the Automated condtrol to whole on-line monitoring system; Industrial computer (21), for Long-distance Control driver module (20), realizes the Automated condtrol of on-line monitoring system.
6. one kind utilizes on-line monitoring system described in claim 1 to the method for decomposed gas component on-line monitoring in SF 6 electrical equipment, it is characterized in that: the content electric discharge of SF6 inside electric appliance or overheating fault being produced to SF6 characteristics of decomposition component carries out real time on-line monitoring, and concrete steps are as follows:
(1) on-line monitoring system impermeability is checked
Close manually-operated gate (2), control driver module (20) by industrial computer (21) and close No. eight electromagnetic switch valves (8), open No. seven electromagnetic switch valves (7), ten No. two electromagnetic switch valves (12), ten No. three electromagnetic switch valves (13), ten No. four electromagnetic switch valves (14), ten No. five electromagnetic switch valves (15), open vacuum pump (10) more successively and No. six electromagnetic switch valves (6) vacuumize whole on-line monitoring system, and control driver module (20) by industrial computer (21) and obtain pressure transducer (16) the whole on-line monitoring system internal pressure value that records, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves (6) and vacuum pump (10) successively, and maintain this state 60 minutes, if pressure increase value is less than 0.05%, then think that system impermeability is good, lower step system proving operation can be carried out, otherwise, think that system impermeability is bad, answering system overhauls,
(2) to the demarcation of on-line monitoring system
When carry out (1) step vacuum pumping meet impermeability intact, the calibrating gas of SF6 gas decomposition components known volume mark is accessed the vacant port of No. eight electromagnetic switch valves (8), No. eight electromagnetic switch valves (8) are opened in control, ten No. three electromagnetic switch valves (13), control to close other electromagnetic switch valves, calibrating gas is filled with to buffer air chamber (9), 0.14-0.15Mpa is reached to buffer air chamber (9) internal pressure, control closedown No. eight electromagnetic switch valves (8) successively, ten No. three electromagnetic switch valves (13), ten No. two electromagnetic switch valves (12) are opened in control, ten No. four electromagnetic switch valves (14), infrared photo acoustic gas sensor (19) is inflated, when infrared optoacoustic gas sensor (19) internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves (12), ten No. four electromagnetic switch valves (14), by set up infrared photo acoustic gas sensor (19) signal intensity and survey quantitative relationship between gas volume fraction, complete the demarcation of on-line monitoring system,
(3) gas washing process is carried out to on-line monitoring system
After (2) step completes, repeat vacuum pumping in (1) step, again pure SF6 gas is accessed the vacant port of No. eight electromagnetic switch valves (8), manually-operated gate (2) is kept to close, No. seven electromagnetic switch valves (7) are opened in control, No. eight electromagnetic switch valves (8), ten No. two electromagnetic switch valves (12), ten No. three electromagnetic switch valves (13), ten No. four electromagnetic switch valves (14), ten No. five electromagnetic switch valves (15), be filled with pure SF6 gas to whole monitoring system and reach 0.2Mpa to monitoring system internal pressure, close No. eight electromagnetic switch valves (8), and leave standstill 10 minutes, repeat above operation 3 times, namely the gas washing process to on-line monitoring system is completed,
(4) operation of on-line monitoring system
After completing (3) step, manually-operated gate (2) is kept to close, control driver module (20) by industrial computer (21) and close No. eight electromagnetic switch valves (8), open No. seven electromagnetic switch valves (7), ten No. two electromagnetic switch valves (12), ten No. three electromagnetic switch valves (13), ten No. four electromagnetic switch valves (14), ten No. five electromagnetic switch valves (15), open vacuum pump (10) more successively and No. six electromagnetic switch valves (6) vacuumize whole on-line monitoring system, and control driver module (20) by industrial computer (21) and obtain pressure transducer (16) the whole on-line monitoring system internal pressure value that records, when its internal pressure reaches-98kPa, control to close No. six electromagnetic switch valves (6) and vacuum pump (10) successively, control closedown No. seven electromagnetic switch valves (7) again, ten No. two electromagnetic switch valves (12), ten No. three electromagnetic switch valves (13), ten No. four electromagnetic switch valves (14), ten No. five electromagnetic switch valves (15), then manually-operated gate (2) is opened, on-line monitoring system is accessed SF6 electrical equipment, No. seven electromagnetic switch valves (7) are opened in control, ten No. three electromagnetic switch valves (13), inside electric appliance SF6 gas is filled with to buffer air chamber (9), 0.14-0.15Mpa is reached to buffer air chamber (9) internal pressure, control closedown No. seven electromagnetic switch valves (7), ten No. three electromagnetic switch valves (13), ten No. two electromagnetic switch valves (12) are opened in control, ten No. four electromagnetic switch valves (14), infrared photo acoustic gas sensor (19) is inflated, when infrared optoacoustic gas sensor (19) internal pressure reaches 0.1Mpa, control closedown ten No. two electromagnetic switch valves (12), ten No. four electromagnetic switch valves (14), the signal intensity being back to the infrared photo acoustic gas sensor (19) of industrial computer (21) by driver module (20) is scaled to surveyed feature decomposition volume components mark, when feature decomposition volume components mark exceedes predetermined threshold value, namely to alert personnel, in feature decomposition component testing process, the power supply being controlled different laser instruments by industrial computer (21) and driver module (20) carries out operation of opening the light, guarantee have at synchronization and only have a laser instrument in running order, then from optical-fiber bundling device export laser only for a certain special characteristic component, by the time-sharing multiplex to optical fiber and photoacoustic cell, realize quantitatively detecting one by one various features decomposition components in photoacoustic cell, after infrared optoacoustic gas sensor (19) completes this detection, ten No. two electromagnetic switch valves (12) are opened in control, ten No. four electromagnetic switch valves (14), ten No. five electromagnetic switch valves (15) and force (forcing) pump (11), force (forcing) pump (11) work makes the SF6 gas of infrared photo acoustic gas sensor (19) and buffer air chamber (9) inside through one-way cock (5), anti-dust filter mesh (3), manually-operated gate (2), get cyclostrophic interface (1) and be sent back to SF6 electrical equipment, when pressure transducer (16) rreturn value is lower than-98kPa, control to close ten No. five electromagnetic switch valves (15) successively, ten No. two electromagnetic switch valves (12), ten No. four electromagnetic switch valves (14), now infrared photo acoustic gas sensor (19) and the inner SF6 gas of buffer air chamber (9) are sent back to electrical equipment, its inner maintenance vacuum state, to detect use next time.
7. on-line monitoring system according to claim 6 is to the method for decomposed gas component on-line monitoring in SF 6 electrical equipment, it is characterized in that: in case of maintenance or other fortuitous events need be closed in line monitoring system, manual-lock manually-operated gate (2), the physical connection of on-line monitoring system and electrical equipment is cut off, and after gas washing process being carried out to on-line monitoring system according to step (3), close whole system.
8. on-line monitoring system according to claim 6 is to the method for decomposed gas component on-line monitoring in SF 6 electrical equipment, it is characterized in that: permanent flow valve (17) is in normally open all the time, gas flow rate in stable infrared optoacoustic gas sensor.
CN201410174004.1A 2014-04-29 2014-04-29 SF 6decomposed gas component on-line monitoring system and method in electrical equipment CN104198393B (en)

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