CN112326596A - SF based on long-optical-path TDLAS technology6Online monitoring device for decomposed substances - Google Patents
SF based on long-optical-path TDLAS technology6Online monitoring device for decomposed substances Download PDFInfo
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- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 title claims abstract description 79
- 238000012806 monitoring device Methods 0.000 title claims abstract description 45
- 239000000126 substance Substances 0.000 title claims description 9
- 239000007789 gas Substances 0.000 claims abstract description 165
- 238000001514 detection method Methods 0.000 claims abstract description 87
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 229910018503 SF6 Inorganic materials 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 11
- 239000013307 optical fiber Substances 0.000 claims description 8
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 7
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 3
- 239000012491 analyte Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000004847 absorption spectroscopy Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical compound FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 description 1
- LSJNBGSOIVSBBR-UHFFFAOYSA-N thionyl fluoride Chemical compound FS(F)=O LSJNBGSOIVSBBR-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention relates to a SF based on a long-optical-path TDLAS technology6Online monitoring device for decomposition products for monitoring SF in GIS equipment6The concentration of the decomposition product includes: a valve block for controlling the SF6The circulation or the blockage of gas passages at different positions in the online decomposed product monitoring device; the TDLAS detection module is used for detecting the concentration of various gases in the gas sample; the closed gas buffer chamber is used for storing the detected gas sample, is matched with the valve bank and is used for realizing the backflow of the gas sample to the GIS equipment; and the control panel is used for controlling the valve group and the TDLAS detection module. Compared with the prior art, the invention carries out SF based on TDLAS technology6The detection of the decomposition products reduces the cost and the complexity of a gas path control system; the sawtooth-shaped total reflection mirrors are arranged at the two ends of the infrared absorption cavity, so that the optical path is greatly increased, and the detection precision of the gas with lower concentration is improved; when the pressure reaches a certain value, the gas in the sealed gas buffer chamber automatically returns to the GIS equipment, the structure is simple, and automatic gas return is realized.
Description
Technical Field
The invention relates to the field of electric power safety, in particular to SF (sulfur hexafluoride) based on a long-optical-path TDLAS (tunable diode laser absorption Spectroscopy) technology6Decomposition product on-line monitoring device.
Background
In recent years, SF6The number of power transformation equipment is gradually increasing, and GIS (Gas Insulated Switchgear) equipment is adopted on a large scale. GIS equipment belongs to high voltage equipment, can cause its inside insulation defect in production, transportation process, and under the high voltage effect, partial discharge punctures appears in the insulation defect. SF in GIS gas-insulated devices when relatively severe Partial Discharges (PD) or Partial Overheats (POT) occur inside the device6The gas is decomposed regularly. Low fluoride (SF) formed by decompositionxX is 1, 2, 3 …) and then with a trace amount of H inherently present in the apparatus2O and O2After the reaction, further generating SO2、HF、SO2F2、SOF2、SOF4And H2And S and other characteristic components not only reduce the insulation performance of the GIS equipment, but also can cause serious faults.
In the prior art, SF is often detected6And (4) carrying out insulation fault diagnosis and maintenance on equipment by using trace characteristic components generated after decomposition. However, when the characteristic components are detected by using the chromatography, the detection requires consumable items such as carrier gas and chromatography column, and the detection time is long, so that the detection is not suitable for continuous on-site detection. The accuracy of non-spectroscopic infrared detection is insufficient, a cross interference phenomenon exists, and the requirement of accurate detection of the concentration of the decomposition product gas in the GIS cannot be met.
The chinese utility model patent with publication number CN209372685U discloses an SF based on internet of things6The analyte analyzer combines spectrum and sound wave to measure, and the spectral sensor and the infrared light source one-to-one correspond have improved measurement accuracy, but, the device does not solve the automatic gas intaking return-air problem, and detects the precision and still waits to improve.
The tdlas (tunable Diode Laser Absorption spectroscopy) technology is a short term for tunable Diode Laser Absorption spectroscopy technology, is one of Absorption spectroscopy technologies, and can realize accurate measurement of specific gas concentration. Compared with the traditional absorption spectrum technology, the tunable diode laser can emit narrow-band laser with single frequency and scan a certain gas absorption line through wavelength tuning, and the emitted laser frequency is very sensitive to the injection laser current and the working temperature. After the laser wavelength emitted by the laser is stabilized at a gas absorption peak, the current tuning frequency can be realized by changing the injection current and the working temperature so as to enable the laser to scan the gas absorption spectrum line, and the method avoids the interference of other background gases on the detection result. By the method, the gas to be detected is stimulated to absorb so that the light intensity of laser is attenuated, the absorbed spectrum signal is collected and processed, and data containing gas concentration information is obtained. However, the detection accuracy of the TDLAS technique is not ideal for gases with low concentrations due to equipment limitations.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an SF based on a long optical path TDLAS technology6Decomposition on-line monitoring device for SF based on TDLAS technology6The detection of the decomposition products reduces the cost and the complexity of a gas path control system, and improves the measurement precision; the sawtooth-shaped total reflection mirrors are respectively arranged at the two ends of the infrared absorption cavity, so that the optical path is greatly increased, and the concentration is improvedThe detection precision of the gas; when the pressure reaches a certain value, the second electromagnetic valve is opened, the gas in the closed gas buffer chamber automatically returns to the GIS equipment, the structure is simple, and automatic gas return is realized.
The purpose of the invention can be realized by the following technical scheme:
SF based on long-optical-path TDLAS technology6Online monitoring device for decomposition products for monitoring SF in GIS equipment6The concentration of the decomposition product includes:
a valve block for controlling the SF6The circulation or the blockage of gas passages at different positions in the online decomposed product monitoring device;
TDLAS detection module for detecting the concentration of various gases in a gas sample, comprising a light path unit and a circuit unit, wherein the gas sample is SF obtained from GIS equipment6A gas;
the closed gas buffer chamber is used for storing the detected gas sample, is matched with the valve bank and is used for realizing the backflow of the gas sample to the GIS equipment;
the control panel, with valves, TDLAS detection module communication connection for valve group and TDLAS detection module.
Further, the SF6The online monitoring device for the decomposition products further comprises an upper computer and a signal acquisition module, wherein the signal acquisition module acquires light intensity electric signals of the TDLAS detection module and transmits the light intensity electric signals to the upper computer, and the upper computer is in communication connection with the control panel and used for sending control commands, calculating in real time and displaying various SF data6The concentration of the decomposition product.
Further, the valve block includes:
the manual valve comprises a first port and a second port, the first port of the manual valve is connected with the GIS equipment and used for controlling the GIS equipment and the SF6The circulation or the blockage of a gas passage between the online decomposed product monitoring devices;
the pressure reducing valve is arranged between the second port of the manual valve and the first electromagnetic valve and used for adjusting the pressure of the gas sample in the gas passage;
the first electromagnetic valve is arranged between the pressure reducing valve and the TDLAS detection module and used for controlling the circulation or the blockage of a gas passage from the pressure reducing valve to the TDLAS detection module;
the one-way valve is arranged between the TDLAS detection module and the closed gas buffer chamber and is used for realizing the one-way conduction of a gas passage from the TDLAS detection module to the closed gas buffer chamber;
and the second electromagnetic valve is arranged between the closed gas buffer and the second port of the manual valve and used for controlling the circulation or the blockage of a gas passage from the closed gas buffer chamber to the GIS equipment.
Further, the SF6The online monitoring device for the decomposition products further comprises:
the flow meter is arranged between the first electromagnetic valve and the TDLAS detection module and used for measuring the flow of the gas sample flowing through the TDLAS detection module;
the pressure air pump is arranged between the TDLAS detection module and the one-way valve and used for pressing the gas sample in the gas passage into the closed gas buffer chamber;
and the pressure sensor is connected with the closed gas buffer chamber and used for measuring the pressure in the closed gas buffer chamber.
Further, the SF6The online monitoring device for the decomposition products further comprises a two-position three-way electromagnetic valve, wherein the two-position three-way electromagnetic valve is arranged between the pressure air pump and the one-way valve and used for SF6When the online monitoring device for the decomposed substances is installed, gas in the device is discharged.
Further, the SF6The online monitoring device for the decomposition products also comprises a case for containing SF6Decomposition product on-line monitoring device.
Further, the SF6The online monitoring device for the decomposition products further comprises an alarm unit and a gas concentration detection unit, wherein the gas concentration detection unit is used for detecting SF in the case6The alarm unit is in communication connection with the control panel and is used for obtaining the output of the gas concentration detection unit and giving an alarm.
Furthermore, the gas concentration detection unit is 1 or more non-light-splitting infrared sensors arranged in the case.
Further, the light path unit of the TDLAS detection module includes a laser set, an input switch, an optical fiber, an infrared absorption cavity, a saw-tooth-shaped total reflector and a focusing device, the laser set includes a plurality of lasers, each laser emits laser with different wavelengths, and the laser is used for detecting various SF in the gas sample respectively6The laser emitted by each laser is adjusted by the input switcher, and then is emitted into the incident port of the infrared absorption cavity along the optical fiber, the sawtooth-shaped total reflectors symmetrically arranged at two ends of the infrared absorption cavity reflect the laser, and the laser is emitted into the focalizer arranged at the exit port of the infrared absorption cavity after being reflected for multiple times.
Furthermore, the circuit unit of the TDLAS detection module includes a detector, a preamplifier, a lock-in amplifier and an a/D converter, the detector receives the laser focused by the focuser and obtains a light intensity signal, and the light intensity signal sequentially passes through the preamplifier, the lock-in amplifier and the a/D converter to obtain a light intensity electrical signal.
Compared with the prior art, the invention has the following beneficial effects:
(1) SF is carried out based on TDLAS technology6Compared with the on-line chromatographic technology, the TDLAS does not consume the sample to be detected, does not need inert carrier gas and a chromatographic column which is easy to pollute and age, reduces the cost, reduces the complexity of a gas circuit control system, eliminates the cross interference of background gas and can measure various gas components.
(2) The TDLAS is improved, the sawtooth-shaped total reflection mirrors are arranged at two ends of the infrared absorption cavity respectively, the optical distance is greatly increased, the detection precision of gas with lower concentration is improved, light intensity electric signals are obtained through a focuser, a detector, a preamplifier, a phase-locked amplifier and an A/D converter subsequently and are transmitted to an upper computer through a signal acquisition module, and the upper computer calculates and displays various SF in real time6The concentration of the decomposition products is high in automation degree.
(3) The pressure air pump recovers air to the closed air buffer chamber, the pressure sensor detects the pressure of the closed air buffer chamber, when the pressure reaches a certain value, the second electromagnetic valve is opened, the air automatically returns to the GIS equipment, the structure is simple, and automatic air return is realized.
(4) 1 or more non-spectroscopic infrared sensors are arranged to detect SF in the case6The concentration of gas judges whether the leakage happens, if the leakage happens, the alarm is given immediately, and the gas passage between the closed gas buffer chamber and the GIS equipment is blocked by the control panel, so that the safety is improved.
(5) Set up the flowmeter, measure the gas flow who flows into TDLAS detection module, according to the gas flow in pressure air pump and the real-time computing device of pressure sensor, through the comparison, can further judge whether take place to leak, further promoted the security.
(6) Two three-way solenoid valves are arranged, and when the device is installed, gas in the device can be exhausted through the two three-way solenoid valves, so that damage to GIS equipment is prevented.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a TDLAS detection module;
reference numerals: 1. the device comprises a manual valve, 2, a pressure reducing valve, 3, a first electromagnetic valve, 4, a flowmeter, 5, a TDLAS detection module, 501, a laser group, 502, an input switcher, 503, an optical fiber, 504, an infrared absorption cavity, 505, a sawtooth-shaped total reflection mirror, 506, a focalizer, 507, a detector, 508, a preamplifier, 509, a lock-in amplifier, 510, an A/D converter, 6, a gas concentration detection unit, 7, a pressure air pump, 8, a two-position three-way electromagnetic valve, 9, a one-way valve, 10, a sealed gas buffer chamber, 11, a pressure sensor, 12 and a second electromagnetic valve.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
GIS fault statistics shows that insulation accidents account for a large proportion, so that in order to effectively monitor the GIS, the insulation performance of the GIS must be deeply researched, insulation faults are timely monitored and diagnosed, state maintenance is achieved, and safe and reliable operation of a power system is guaranteed.
SF6(Sulfur hexafluoride) decomposes into monoatomic radicals under the action of electric arc and heat, and a small part of the monoatomic radicals reacts with free metal atoms, water and oxygen to generate metal fluoride and oxygen and sulfur fluoride. These SF compounds6The concentration of decomposition products is very low, and SF is treated by TDLAS technology6Detection of trace (ppm) decomposition products can infer the condition of arcing in the GIS gas chamber and the type of insulation fault caused by the arcing.
SF based on long-optical-path TDLAS technology6Online monitoring device for decomposition products for monitoring SF in GIS equipment6The overall structure of the concentration of the decomposition products is shown in fig. 1, and includes a valve set, a TDLAS detection module 5, a sealed gas buffer chamber 10, and a control board (not shown). The closed gas buffer chamber 10 is used for storing the detected gas sample, is matched with the valve group and is used for realizing the backflow of the gas sample to the GIS equipment. Control panel and valves, TDLAS detection module 5 communication connection for valve group and TDLAS detection module 5.
Wherein the valve group is used for controlling SF6The circulation or blockage of gas passages at different positions in the online decomposed product monitoring device. The valve block includes:
the manual valve 1 comprises a first port and a second port, the first port of the manual valve 1 is connected with GIS equipment and is used for controlling the GIS equipment and SF6The circulation or the blockage of a gas passage between the online decomposed product monitoring devices;
a pressure reducing valve 2 provided between the second port of the manual valve 1 and the first electromagnetic valve 3 for adjusting the pressure of the gas sample in the gas passage;
the first electromagnetic valve 3 is arranged between the pressure reducing valve 2 and the TDLAS detection module 5 and is used for controlling the circulation or the blockage of a gas passage from the pressure reducing valve 2 to the TDLAS detection module 5;
the one-way valve 9 is arranged between the TDLAS detection module 5 and the closed gas buffer chamber 10 and is used for realizing the one-way conduction of a gas passage from the TDLAS detection module 5 to the closed gas buffer chamber 10;
and a second electromagnetic valve 12, which is arranged between the sealed gas buffer and the second port of the manual valve 1 and is used for controlling the circulation or the blockage of a gas passage from the sealed gas buffer chamber 10 to the GIS equipment.
SF6The online monitoring device for the decomposition products further comprises a flow meter 4, a pressure air pump 7 and a pressure sensor 11. Flowmeter 4 is located between first solenoid valve 3 and TDLAS detection module 5 for the flow of measuring the gas sample that flows through TDLAS detection module 5. The pressure air pump 7 is arranged between the TDLAS detection module 5 and the one-way valve 9 and used for pressing the gas sample in the gas passage into the closed gas buffer chamber 10. The pressure sensor 11 is connected to the closed gas buffer chamber 10, and is configured to measure the pressure in the closed gas buffer chamber 10.
SF6The online monitoring device for the decomposition products also comprises a case, an alarm unit and a gas concentration detection unit 6, wherein the case is used for containing SF6The online monitoring device for the decomposed substances comprises a gas concentration detection unit 6 for detecting SF in the case6The gas concentration and alarm unit is in communication connection with the control panel and is used for obtaining the output of the gas concentration detection unit 6 and giving an alarm. The gas concentration detection unit 6 is 1 or more non-dispersive infrared sensors arranged in the case. In this embodiment, the gas concentration detection unit 6 is 1 non-dispersive infrared sensor arranged in the case, and the alarm unit is an alarm.
In the use of SF6When the online monitoring device for the decomposition products is used, if the internal connection of the device is loosened or broken, leakage can be caused, and SF (sulfur hexafluoride) is avoided6And gas leakage provides two detection modes. Can directly detect SF in the case through the non-dispersive infrared sensor6The concentration of gas, if leakage occurs, the non-light-splitting infrared sensor will detect SF in the machine case6And (4) the alarm can give an alarm according to the concentration of the gas, the second electromagnetic valve is closed through the control panel, the gas outlet is closed, and the detection is stopped. Also can read the flow of the gaseous sample of the measuring entering TDLAS detection module 5 of flowmeter 4, again according to the gas flow in the real-time computing device of pressure air pump 7 and pressure sensor 11, through the comparison, can further judge whether take place to leak, further promoted the security.
SF6The online monitoring device for the decomposition products further comprises a two-position three-way electromagnetic valve 8, wherein the two-position three-way electromagnetic valve 8 is arranged between the pressure air pump 7 and the one-way valve 9 and is used for SF6When the online monitoring device for the decomposed substances is installed, gas in the device is discharged.
TDLAS detection module 5 is used for detecting the concentration of various gases in the gas sample, and the gas sample is SF obtained from GIS equipment6The gas, as shown in fig. 2, the TDLAS detection module 5 includes an optical path unit and an electric circuit unit.
The TDLAS technique is one of absorption spectroscopy techniques, in which a tunable diode laser can emit narrow-band laser light of a single frequency and scan a certain gas absorption line by wavelength tuning, and the emitted laser frequency is very sensitive to the injection laser current and the operating temperature. After the laser wavelength emitted by the laser is stabilized at the gas absorption peak, the current tuning frequency can be realized by changing the injection current and the working temperature so as to enable the laser to scan the gas absorption spectral line. The gas to be measured absorbs the laser, so that the light intensity of the laser is attenuated, and the absorbed spectrum signal is collected and processed, so that data containing gas concentration information can be obtained. In order to enhance the detection precision of gas with lower concentration, the laser detection device is provided with two saw-tooth-shaped total reflection mirrors 505 for reflecting laser, so that the optical path is increased, and the detection result is more accurate.
The optical path unit of the TDLAS detection module 5 includes a laser group 501, an input switch 502, an optical fiber 503, an infrared absorption cavity 504, a saw-tooth-shaped total reflection mirror 505, and a focusing device 506, where the laser group 501 includes a plurality of lasers, and each laser emits laser with different wavelengths, and is used to detect various SFs in a gas sample respectively6The decomposed product, the laser emitted by each laser, is adjusted by the input switch 502, and then is emitted into the incident port of the infrared absorption cavity 504 along the optical fiber 503, the laser is reflected by the saw-tooth-shaped total reflection mirrors 505 symmetrically arranged at the two ends of the infrared absorption cavity 504, and the laser after multiple reflections is emitted into the focusing device 506 arranged at the exit port of the infrared absorption cavity 504.
In this embodiment, 5 lasers are provided to detect HF and SO, respectively2，H2S，CO，H2O5 kinds of SF6The decomposition product emits laser with wavelengths of 1278nm, 2460nm, 1578nm, 1567nm and 1393nm respectively. During detection, the laser emitted by each laser is used for detecting SF6And (4) decomposing the product. In other embodiments, more lasers may be used to detect other SFs6And (4) decomposing the product.
The circuit unit of the TDLAS detection module 5 includes a detector 507, a preamplifier 508, a lock-in amplifier 509 and an a/D converter 510, wherein the detector 507 receives the laser focused by the focuser 506 and obtains a light intensity signal, and the light intensity signal passes through the preamplifier 508, the lock-in amplifier 509 and the a/D converter 510 in sequence to obtain a light intensity electrical signal.
SF6The online monitoring device for the decomposition products further comprises an upper computer and a signal acquisition module, wherein the signal acquisition module acquires light intensity electric signals of the TDLAS detection module and transmits the light intensity electric signals to the upper computer, and the upper computer is in communication connection with the control panel and is used for sending control commands, calculating in real time and displaying various SF (sulfur hexafluoride) values6The concentration of the decomposition product.
Using SF6The online monitoring device for the decomposed substances mainly operates as follows:
the air in the device is firstly exhausted, and N can be used2Flushing devices and gas passages, using SF before installation6The gas flushing device and the passage are opened and closed by a two-position three-way electromagnetic valve 8 to flush N2The gas after flushing is discharged to remove SF6And gas is discharged into the recovery tank to prevent the GIS equipment from being damaged.
The first port of the manual valve 1 is connected with GIS equipment, and SF is used for opening the manual valve 16Gaseous flow out from GIS equipment, make it be the ordinary pressure state through relief pressure valve 2, first solenoid valve 3 opens, and gaseous TDLAS detection module 5 that flows into.
Starting a single laser, for example, starting a laser with a laser wavelength of 1278nm when detecting HF, starting a laser with a laser wavelength of 1567nm when detecting CO, and adjusting directions of laser beams emitted by the lasers arranged at different positions through the input switcher 502 to be emitted into an entrance port of the infrared absorption cavity 504 along the optical fiber 503. In this embodiment, the sawtooth angle of the sawtooth-shaped total reflection mirror 505 is 90 degrees, and the laser beam entering the infrared absorption cavity 504 forms an included angle of 45 degrees with the horizontal direction, so that the laser beam is reflected back and forth in the infrared absorption cavity 504 by the two sawtooth-shaped total reflection mirrors 505, and the optical path is greatly increased. After multiple reflections, the laser light is incident on a focusing device 506 disposed at the exit of the infrared absorbing cavity 504.
The detector 507, i.e., a light Power Detector (PD), detects the laser signal absorbed by the gas sample in the infrared absorption cavity 504, and converts the laser signal into an analog electrical signal, i.e., a light intensity electrical signal, through a preamplifier 508, a lock-in amplifier 509, and an a/D converter 510.
Sequentially starting the laser to finish the HF and SO2，H2S，CO，H2O5 SF6And (4) detecting the decomposition products.
The signal acquisition module acquires the light intensity electric signal and displays the light intensity electric signal on the upper computer in a waveform mode, and meanwhile the upper computer calculates various SF according to the light intensity electric signal6The concentration of the decomposition product.
In this embodiment, the host computer is the industrial computer, and the industrial computer adopts MODBUS RTU mode communication to break first solenoid valve 3, second solenoid valve 12, start pressure air pump 7 etc. through setting up the register with the control panel. The industrial personal computer can realize various communication protocols, and in other embodiments, the industrial personal computer can also adopt modes such as MODBUS TCP protocol and IEC61850 protocol to communicate with the control panel, and is suitable for various systems.
The signal acquisition module is an NI acquisition card and a lock-in amplifier, the NI acquisition card acquires a light intensity electric signal obtained by the TDLAS detection module 5, the signal passes through the lock-in amplifier to realize the extraction of the signal, and the calculation formula of the lock-in amplifier is as follows:
wherein, VoFor the calculated light intensity signal, it is displayed on the industrial control computer, VsLight intensity electric signal V acquired by NI acquisition cardrAs a reference signal, the reference signal is,
the light intensity electric signal collected by the NI collection card andphase difference of reference signal, when the light intensity electric signal collected by NI collecting card and reference signal have the same frequency, VoIs related to the amplitude of the light intensity electric signal collected by the NI collection card and the phase difference between the light intensity electric signal collected by the NI collection card and the reference signal
In connection with adjusting the phase of the reference signal
When the phase position of the light intensity electric signal collected by the NI collecting card
When, VoProportional to the amplitude of the signal to be measured.
The gas concentration is determined from the attenuation of the laser, and the measurement principle is based on the Beer-Lambert law of absorption spectroscopy:
It(λ)＝I0(λ)exp-[α(λ)CL]＝I0(λ)exp-[δ(λ)NL]
wherein, I0(λ) is the intensity of the incident light, It(λ) is the transmitted light intensity, δ (λ) is the volume fraction of gas molecules in cross section C, N is the number density of gas molecules, and L is the absorption optical path of the gas absorption optical path.
In the embodiment, a calculation formula of the gas concentration is obtained through Beer-Lambert law evolution:
wherein C is the gas concentration, I0Is the initial light intensity of the laser, I is the light intensity of the laser after passing through the gas to be measured, S (T) is the linear intensity of the spectral line,
for the absorption coefficient, P is the gas pressure and L is the optical path through the gas cell to be measured.
Gaseous outflow TDLAS detection module 5 back, airtight gaseous buffer chamber 10 is impressed with the gas sample in the gas passage to pressure air pump 7, check valve 9 realizes by TDLAS detection module 5 to airtight gaseous buffer chamber 10 between the one-way conduction of gas passage, pressure sensor 11 detects the pressure of airtight gaseous buffer chamber 10, when pressure in airtight gaseous buffer chamber 10 reaches a definite value, second solenoid valve 12 opens, gaseous automatic GIS equipment that returns, moreover, the steam generator is simple in structure, automatic gas return has been realized.
During detection, the gas concentration detection unit 6 detects whether leakage exists in real time, the measured value of the flow meter 4 is compared with the gas flow calculated according to the pressure air pump 7 and the pressure sensor 11 to judge whether leakage occurs, once leakage occurs, the alarm gives an alarm, and the electromagnetic valve 12 is closed through the control panel.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. SF based on long-optical-path TDLAS technology6On-line monitoring device for decomposition products, which is used for monitoring SF in GIS equipment6The concentration of the decomposition product includes:
a valve block for controlling the SF6The circulation or the blockage of gas passages at different positions in the online decomposed product monitoring device;
TDLAS detection module (5) for detecting the concentration of various gases in a gas sample, comprising a light path unit and a circuit unit, wherein the gas sample is SF obtained from GIS equipment6A gas;
the closed gas buffer chamber (10) is used for storing the detected gas sample, is matched with the valve bank and is used for realizing the backflow of the gas sample to the GIS equipment;
the control panel, with valves, TDLAS detection module (5) communication connection for valve group and TDLAS detection module (5) control.
2. The SF according to claim 1 based on long optical path TDLAS technique6On-line monitoring device for decomposition products, characterized in that said SF6The online monitoring device for the decomposition products further comprises an upper computer and a signal acquisition module, wherein the signal acquisition module acquires light intensity electric signals of the TDLAS detection module (5) and transmits the light intensity electric signals to the upper computer, and the upper computer is in communication connection with the control panel and used for sending control commands, calculating in real time and displaying various SF data6The concentration of the decomposition product.
3. The SF according to claim 1 based on long optical path TDLAS technique6Online monitoring devices of analyte, its characterized in that, the valves includes:
the manual valve (1) comprises a first port and a second port, the first port of the manual valve (1) is connected with GIS equipment and used for controlling the GIS equipment and SF6The circulation or the blockage of a gas passage between the online decomposed product monitoring devices;
the pressure reducing valve (2) is arranged between the second port of the manual valve (1) and the first electromagnetic valve (3) and is used for adjusting the pressure of the gas sample in the gas passage;
the first electromagnetic valve (3) is arranged between the pressure reducing valve (2) and the TDLAS detection module (5) and is used for controlling the circulation or the blockage of a gas passage from the pressure reducing valve (2) to the TDLAS detection module (5);
the one-way valve (9) is arranged between the TDLAS detection module (5) and the closed gas buffer chamber (10) and is used for realizing the one-way conduction of a gas passage from the TDLAS detection module (5) to the closed gas buffer chamber (10);
and the second electromagnetic valve (12) is arranged between the closed gas buffer and the second port of the manual valve (1) and is used for controlling the circulation or the blockage of a gas passage from the closed gas buffer chamber (10) to the GIS equipment.
4. The SF according to claim 3 based on long optical path TDLAS technique6On-line monitoring device for decomposition products, characterized in that said SF6On-line monitoring of decomposition productsThe device still includes:
the flowmeter (4) is arranged between the first electromagnetic valve (3) and the TDLAS detection module (5) and is used for measuring the flow of the gas sample flowing through the TDLAS detection module (5);
the pressure air pump (7) is arranged between the TDLAS detection module (5) and the one-way valve (9) and is used for pressing the gas sample in the gas passage into the closed gas buffer chamber (10);
and the pressure sensor (11) is connected with the closed gas buffer chamber (10) and is used for measuring the pressure in the closed gas buffer chamber (10).
5. The SF according to claim 4 based on long optical path TDLAS technique6On-line monitoring device for decomposition products, characterized in that said SF6The online monitoring device for the decomposition products further comprises a two-position three-way electromagnetic valve (8), wherein the two-position three-way electromagnetic valve (8) is arranged between the pressure air pump (7) and the one-way valve (9) and is used for carrying out SF6When the online monitoring device for the decomposed substances is installed, gas in the device is discharged.
6. The SF according to claim 1 based on long optical path TDLAS technique6On-line monitoring device for decomposition products, characterized in that said SF6The online monitoring device for the decomposition products also comprises a case for containing SF6Decomposition product on-line monitoring device.
7. The SF according to claim 6 and based on long optical path TDLAS technique6On-line monitoring device for decomposition products, characterized in that said SF6The online monitoring device for the decomposition products further comprises an alarm unit and a gas concentration detection unit (6), wherein the gas concentration detection unit (6) is used for detecting SF in the case6The alarm unit is in communication connection with the control panel and is used for obtaining the output of the gas concentration detection unit (6) and giving an alarm.
8. The SF based on long optical path TDLAS technique of claim 76On-line monitoring device for decomposition products, characterized in that the gas concentrationThe detection unit (6) is 1 or more non-light-splitting infrared sensors arranged in the case.
9. The SF according to claim 1 based on long optical path TDLAS technique6The online monitoring device for the decomposed substances is characterized in that the light path unit of the TDLAS detection module (5) comprises a laser group (501), an input switcher (502), an optical fiber (503), an infrared absorption cavity (504), a sawtooth-shaped total reflection mirror (505) and a focalizer (506), wherein the laser group (501) comprises a plurality of lasers, and each laser emits laser with different wavelengths and is used for detecting various SF (sulfur hexafluoride) in a gas sample respectively6And decomposing substances, namely laser emitted by each laser is adjusted by an input switcher (502) in direction and then is incident into an incident port of the infrared absorption cavity (504) along the optical fiber (503), the laser is reflected by saw-tooth-shaped total reflection mirrors (505) symmetrically arranged at two ends of the infrared absorption cavity (504), and the laser after multiple reflections is incident into a focuser (506) arranged at an exit port of the infrared absorption cavity (504).
10. The SF according to claim 1 based on long optical path TDLAS technique6The online monitoring device for the decomposed products is characterized in that a circuit unit of the TDLAS detection module (5) comprises a detector (507), a preamplifier (508), a lock-in amplifier (509) and an A/D converter (510), wherein the detector (507) receives laser focused by a focuser (506) and obtains a light intensity signal, and the light intensity signal sequentially passes through the preamplifier (508), the lock-in amplifier (509) and the A/D converter (510) to obtain a light intensity electric signal.
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Application publication date: 20210205 |