CN103411920A - Portable multi-component online monitor of gas dissolved in transformer oil - Google Patents
Portable multi-component online monitor of gas dissolved in transformer oil Download PDFInfo
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- CN103411920A CN103411920A CN201310278008XA CN201310278008A CN103411920A CN 103411920 A CN103411920 A CN 103411920A CN 201310278008X A CN201310278008X A CN 201310278008XA CN 201310278008 A CN201310278008 A CN 201310278008A CN 103411920 A CN103411920 A CN 103411920A
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- semiconductor laser
- optical fibre
- photoswitch
- absorption cell
- optical fiber
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Abstract
The invention discloses a portable multi-component online monitor of gas dissolved in transformer oil. A plurality of semiconductor lasers are arranged in a main chassis, each semiconductor laser is connected with a semiconductor laser controller, each semiconductor laser is jointly connected with a signal generating circuit and a 1*N photoswitch, the 1*N photoswitch is connected with an output optical fiber connector on the main chassis, the output optical fiber connector is connected into a long-optical distance gas absorption cell through an output optical fiber, the long-optical distance gas absorption cell is connected with an input optical fiber, the other end of the input optical fiber is connected with an input optical fiber connector on the main chassis, the input optical fiber connector is connected with a calibration absorption cell in the main chassis, and a focusing lens, an infrared photoelectric detector, a connecting lock-in amplifier and a data acquisition control module are sequentially arranged at a front-end light exit of the calibration absorption cell. According to the portable multi-component online monitor, the demand on safe monitoring of a transformer is met, and the high-sensitivity and real-time online monitoring of a failure of the transformer is actually realized.
Description
Technical field
The invention belongs to a kind of laser spectrum surveying instrument of gas, a kind of portable transformer oil dissolved gas polycomponent on-line monitoring instrument specifically, it can measure CO, CO simultaneously
2, C
2H
2And CH
4The concentration of four kinds of gases.
Background technology
Along with the expansion of domestic electricity needs and electrical network scale, transformer is as the hinge equipment of electric system, and its operational reliability directly affects the safe operation of electric system.In transformer insulation oil, gas composition and concentration have reflected thermoelectricity fault degree and the serviceable life of transformer largely, and oneself becomes the effective technology means of the inner latency fault detect of transformer the Gas in Oil of Transformer analysis.Polycomponent, the online measuring technique of research and development insulating oil gas have important theory and realistic meaning.
The Gases Dissolved in Transformer Oil component mainly contains N
2, O
2, H
2, CH
4, C
2H
2, C
2H
4, C
2H
6, CO, CO
2Deng gas.Oil in oil-immersed power transformer and insulating paper material are under hot and electric acting in conjunction under normal circumstances, and aging and decomposition gradually, produce a small amount of low molecular hydrocarbon and CO
2, the gas such as CO, and the air dissolved in oil is called normal gas together.When if there is the overheated or discharge fault of latency in transformer inside, just can accelerate the aging of oil and insulating paper material and decomposition, produce relatively large CH
4, C
2H
2, H
2, CO, CO
2Deng gas, be called failure gas.The inner most of gas flow of transformer all can be dissolved in transformer oil when less, when gas yield is greater than in oil meltage, just has portion gas to discharge with the form of free state.Therefore by on-line monitoring gases dissolved in insulation oil contamination, can reflect the operation conditions of transformer, detect timely and accurately power transformer latency fault.
The company standard regulation CH of State Grid Corporation of China
4, C
2H
2The lowest detection limit value 0.5
, CO
2, CO the lowest detection limit value be 25
.The monitoring instrument of generally using at present also is based on the instrument that oil chromatography is analyzed basically.Although Oil chromatography analysis has enough detection sensitivities, conventional Oil chromatography analysis is a kind of off-line analysis method, and part comes with some shortcomings: not only degassedly middlely may have larger error, and the artificial correction of detection curve also can strengthen error.From the lab analysis of drawing oil sample, the job procedure complexity, time and the expense of cost are higher.On Technological Economy, can not adapt to the needs of power system development, sense cycle is long, can not find in time the latency fault and effectively follow the tracks of development trend, because being subjected to the restriction of its cost of equipment and technical force, can not be equipped with conventional oil chromatography analyser in each power station, the operations staff can't grasp and monitor the operation conditions of our station transformer at any time, thereby can strengthen accident rate.Based on the gas sensing technology of laser spectrum tech, can realize highly sensitive, high-resolution, untouched online inspection to gas, the instrument maintenance amount is low.In the time of by many gas componants, measure, can also greatly improve sensitivity and the reliability of monitoring, reduce the rate of false alarm of transformer fault.Therefore, the technology detected based on the gas of laser spectrometry has the important application prospect in the on-line monitoring field of Gases Dissolved in Transformer Oil.
Summary of the invention
The present invention proposes a kind of CO of polycomponent based on the tunable diode laser absorption spectroscopy technology, CO
2, C
2H
2, CH
4Highly sensitive on-line monitoring instrument, use three near-infrared band dfb semiconductor laser instruments, utilizes CO, CO
2, C
2H
2And CH
4Characteristic absorption in the near infrared spectrum district, and realize CO, CO in conjunction with the fiber-optical switch technology
2, C
2H
2And CH
4Timesharing detect, adopt Wavelength modulation spectroscopy and second-harmonic detection technology, the long light path technology realization of cascaded structure to Gases Dissolved in Transformer Oil CO, CO
2, C
2H
2And CH
4Quick, highly sensitive, glitch-free gas concentration measurement.By in oil, dissolving the multiple gases composition, detecting simultaneously, improved accuracy and the reliability of transformer fault diagnosis.
Technical scheme of the present invention is as follows:
Portable transformer oil dissolved gas polycomponent on-line monitoring instrument, include mainframe box and long light path gas absorption cell, Switching Power Supply is installed on mainframe box, main power switch, it is characterized in that: in described mainframe box, be provided with several semiconductor lasers, each semiconductor laser all is connected with a semiconductor laser controller, each semiconductor laser is connected with a signal generating circuit jointly, the output terminal of each semiconductor laser connects 1 * N photoswitch, 1 * N photoswitch is connected with the photoswitch driving circuit, 1 * N photoswitch also is connected with the output optical fibre connector on mainframe box, on the output optical fibre connector, be connected with output optical fibre, the long light path gas absorption cell of other end access of output optical fibre, long light path gas absorption cell is connected with input optical fibre, the other end of input optical fibre connects the input optical fibre connector on mainframe box, the input optical fibre connector connects the steam correcting absorptive pool in mainframe box, the front end optical emission exit place of steam correcting absorptive pool is provided with condenser lens successively, infrared photoelectric detector, infrared photoelectric detector connects lock-in amplifier, lock-in amplifier connection data acquisition control module, the external LCD MODULE of data acquisition and control module, data acquisition and control module and photoswitch driving circuit, the signal generating circuit control linkage.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument, it is characterized in that: described long light path gas absorption cell adopts the long light path gas absorption cell of cascaded structure, three reflective air chamber overlapped in series structures of Bian, include the air chamber framework that stainless steel material makes and accurately be fixed on two couple on the air chamber framework with effectively high coupling ratios GRIN Lens and a pair of input of tail optical fiber, the output optical fibre coupling mechanism, described output optical fibre connects the output optical fibre coupling mechanism, laser focuses on through two GRIN Lens again after Multi reflection in long light path gas absorption cell, finally again after Multi reflection to the input optical fibre coupling mechanism, the input optical fibre coupling mechanism connects input optical fibre, long light path gas absorption cell also is provided with air intake opening, gas outlet.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument, it is characterized in that: the number of described semiconductor laser is three, be respectively 1570 nm near infrared dfb semiconductor laser instruments, 1529nm near infrared dfb semiconductor laser instrument, 1654nm near infrared dfb semiconductor laser instrument, three three semiconductor laser controllers corresponding to semiconductor laser are respectively 1570 nm semiconductor laser temperature current control modules, 1529nm semiconductor laser temperature current control module, 1654nm semiconductor laser temperature current control module.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument is characterized in that: described 1 * N photoswitch adopts 1 * 3 photoswitch.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument is characterized in that: in described mainframe box, also be provided with the optical fiber joint flange, the tail optical fiber output of three semiconductor lasers is coupled into 1 * 3 photoswitch by the optical fiber joint flange.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument is characterized in that: described steam correcting absorptive pool adopts to be built-in with and is full of atmospheric pressure CO, a CO
2, C
2H
2, CH
4The 10cm steam correcting absorptive pool of normal mixture body.
Described portable transformer oil dissolved gas polycomponent on-line monitoring instrument, is characterized in that: on described mainframe box, also be provided with supply socket, fan, data connector etc.
Advantage of the present invention is:
The present invention utilizes the long light path technology of up-to-date Near-infrared Tunable Diode Laser Absorption Spectroscopy, cascaded structure to realize Gases Dissolved in Transformer Oil CO, CO
2, C
2H
2And CH
4The real time on-line monitoring of concentration, utilize tunable diode laser absorption spectroscopy technology high-resolution characteristics to eliminate the interference of other gas componant in the surrounding air, overcome technically the traditional instrument response speed slowly, easily be disturbed, easily poisoning, can not realize continuous real-time monitoring and high in cost of production shortcoming, utilize same set of light path to realize that the multiple gases component monitors simultaneously, reduced the system cost of Gases Dissolved in Transformer Oil monitoring, to C
2H
2And CH
4The detectability of concentration is lower than 0.5
, to CO, CO
2Detectability lower than 10
, met the needs of transformer safety monitoring, really realized highly sensitive, real time on-line monitoring to transformer fault.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the long light path gas absorption cell of cascaded structure structural representation.
Number in the figure: 1, mainframe box, 2, main power switch, 3, 1570 nm semiconductor laser temperature current control modules, 4, signal generating circuit, 5, 1529nm semiconductor laser temperature current control module, 6, 1654nm semiconductor laser temperature current control module, 7, 1570 nm near infrared dfb semiconductor laser instruments, 8, 1529nm near infrared dfb semiconductor laser instrument, 9, 1654nm near infrared dfb semiconductor laser instrument, 10, 1 * 3 photoswitch, 11, 1 * 3 photoswitch driving circuit 12, the output optical fibre connector, 13, the input optical fibre connector, 14, steam correcting absorptive pool, 15, condenser lens, 16, infrared photoelectric detector, 17, lock-in amplifier, 18, data acquisition and control module, 19, Switching Power Supply 20, LCD MODULE, above-mentioned related parts all are mounted on cabinet 1.21, output optical fibre, 22 input optical fibres, 23, the long light path gas absorption cell of cascaded structure, 24, GRIN Lens one, 25, GRIN Lens two, 26, air intake opening, 27, gas outlet.
Embodiment
Referring to Fig. 1, Fig. 2.
It is that the near infrared dfb semiconductor laser instrument 7 of 1570nm is as CO, CO that the present invention adopts centre wavelength
2The detection laser light source, 1570 nm semiconductor laser temperature current control modules 3 by laser temperature, Current Control by the laser instrument output center wavelength near 1570nm, the 100Hz sawtooth signal that signal generating circuit 4 produces be superimposed upon on the drive current of laser instrument make optical maser wavelength slowly scanning successively by CO, CO
2The Absorption Line of gas, signal generating circuit 4 produce simultaneously and to laser output wavelength, carry out tuning on the drive current that the 10KHz sine wave signal is superimposed upon laser instrument.Adopting centre wavelength is that the near infrared dfb semiconductor laser instrument 8 of 1529nm is as C
2H
2The detection laser light source, utilize 1529nm semiconductor laser temperature current control module 5 by the laser instrument output center wavelength be tuned to 1529.2 nm C
2H
2An Absorption Line center.Adopting centre wavelength is that the near infrared dfb semiconductor laser instrument 9 of 1654nm is as CH
4The detection laser light source, utilize 1654nm semiconductor laser temperature current control module 6 by the laser instrument output center wavelength be tuned to 1653.7nm CH
4An Absorption Line center, 1570 nm near infrared dfb semiconductor laser instrument 7,1529 nm near infrared dfb semiconductor laser instruments 8 and 1654 nm near infrared dfb semiconductor laser instruments 9 share length scanning and the modulation signal produced by signal generating circuit 4.At first the tail optical fiber output of three laser instruments be coupled into 1 * 3 photoswitch 10,1 * 3 photoswitch driving circuits 11 order under the gating signal effect that data acquisition and control module 18 is sent by the optical fiber joint flange detection laser be coupled to output terminal, realizes CO, CO
2, C
2H
2And CH
4The timesharing of gas detects.The laser beam of 1 * 3 photoswitch 10 gating outputs is connected with outer light path by output optical fibre connector 12 and output optical fibre 21, realizes that the polycomponent timesharing of single cover system detects.In each sense cycle, 1 * 3 photoswitch 10 output channel scanning one-periods, namely sequentially be coupled to the output of three laser instruments outer detection light path, completes CO, CO
2, C
2H
2, CH
4A sequence detection of gas concentration.The long light path gas absorption cell 23 that outer detection light path adopts is long light path structures of three reflective air chamber overlapped in series, and the design maximum light path is 60m.Light beam returns to mainframe box 1 by input optical fibre connector 13 after surveyed area, input optical fibre 22 exit ports that are connected with input optical fibre connector 13 have one built-in to be full of atmospheric pressure CO, a CO
2, C
2H
2, CH
4The 10cm steam correcting absorptive pool 14 of normal mixture body, for the real time calibration to the detection absorption signal.Emergent light focuses on the photosurface of an infrared photoelectric detector 16 through condenser lens 15 after steam correcting absorptive pool 14.Detector signal send lock-in amplifier 17 to carry out the second harmonic signal detection, and the reference signal of lock-in amplifier 17 comes from the sinusoidal modulation signal that signal generating circuit 4 produces.Utilize steam correcting absorptive pool 14 absorption signals of pre-save to lock-in amplifier 17 output second harmonic signals, in data acquisition and control module 18, carry out the long-pending match of least square and deduct the calibration pool gas concentration obtaining multicomponent gas concentration; Data acquisition and control module 18 is connected with LCD MODULE 20.Mainframe box 1 is provided with main power switch 2, Switching Power Supply 19.
Long light path gas absorption cell 23 adopts the long light path gas absorption cell of cascaded structure, three reflective air chamber overlapped in series structures of Bian, include the air chamber framework that stainless steel material makes and accurately be fixed on two couple on the air chamber framework with the effectively high coupling ratios GRIN Lens 24 of tail optical fiber, 25 and a pair of input, the output optical fibre coupling mechanism, output optical fibre 21 connects the output optical fibre coupling mechanism, laser long light path gas absorption cell 23 interior after Multi reflection again through two GRIN Lens 24, 25 focus on, finally again after Multi reflection to the input optical fibre coupling mechanism, the input optical fibre coupling mechanism connects input optical fibre 22, long light path gas absorption 23 ponds also are provided with air intake opening 26, gas outlet 27.
Claims (7)
1. portable transformer oil dissolved gas polycomponent on-line monitoring instrument, include mainframe box and long light path gas absorption cell, Switching Power Supply is installed on mainframe box, main power switch, it is characterized in that: in described mainframe box, be provided with several semiconductor lasers, each semiconductor laser all is connected with a semiconductor laser controller, each semiconductor laser is connected with a signal generating circuit jointly, the output terminal of each semiconductor laser connects 1 * N photoswitch, 1 * N photoswitch is connected with the photoswitch driving circuit, 1 * N photoswitch also is connected with the output optical fibre connector on mainframe box, on the output optical fibre connector, be connected with output optical fibre, the long light path gas absorption cell of other end access of output optical fibre, long light path gas absorption cell is connected with input optical fibre, the other end of input optical fibre connects the input optical fibre connector on mainframe box, the input optical fibre connector connects the steam correcting absorptive pool in mainframe box, the front end optical emission exit place of steam correcting absorptive pool is provided with condenser lens successively, infrared photoelectric detector, infrared photoelectric detector connects lock-in amplifier, lock-in amplifier connection data acquisition control module, the external LCD MODULE of data acquisition and control module, data acquisition and control module and photoswitch driving circuit, the signal generating circuit control linkage.
2. portable transformer oil dissolved gas polycomponent on-line monitoring instrument according to claim 1, it is characterized in that: described long light path gas absorption cell adopts the long light path gas absorption cell of cascaded structure, three reflective air chamber overlapped in series structures of Bian, include the air chamber framework that stainless steel material makes and accurately be fixed on two couple on the air chamber framework with effectively high coupling ratios GRIN Lens and a pair of input of tail optical fiber, the output optical fibre coupling mechanism, described output optical fibre connects the output optical fibre coupling mechanism, laser focuses on through two GRIN Lens again after Multi reflection in long light path gas absorption cell, finally again after Multi reflection to the input optical fibre coupling mechanism, the input optical fibre coupling mechanism connects input optical fibre, long light path gas absorption cell also is provided with air intake opening, gas outlet.
3. portable transformer oil dissolved gas polycomponent on-line monitoring instrument according to claim 1, it is characterized in that: the number of described semiconductor laser is three, be respectively 1570 nm near infrared dfb semiconductor laser instruments, 1529nm near infrared dfb semiconductor laser instrument, 1654nm near infrared dfb semiconductor laser instrument, three three semiconductor laser controllers corresponding to semiconductor laser are respectively 1570 nm semiconductor laser temperature current control modules, 1529nm semiconductor laser temperature current control module, 1654nm semiconductor laser temperature current control module.
4. according to the described portable transformer oil dissolved gas of claim 1 or 3 polycomponent on-line monitoring instrument, it is characterized in that: described 1 * N photoswitch adopts 1 * 3 photoswitch.
5. according to claim 1 or 3 or 4 described portable transformer oil dissolved gas polycomponent on-line monitoring instrument, it is characterized in that: in described mainframe box, also be provided with the optical fiber joint flange, the tail optical fiber output of three semiconductor lasers is coupled into 1 * 3 photoswitch by the optical fiber joint flange.
6. portable transformer oil dissolved gas polycomponent on-line monitoring instrument according to claim 1 is characterized in that: described steam correcting absorptive pool adopts to be built-in with and is full of atmospheric pressure CO, a CO
2, C
2H
2, CH
4The 10cm steam correcting absorptive pool of normal mixture body.
7. portable transformer oil dissolved gas polycomponent on-line monitoring instrument according to claim 1, is characterized in that: on described mainframe box, also be provided with supply socket, fan, data connector etc.
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|---|---|---|---|
| CN201310278008XA CN103411920A (en) | 2013-07-03 | 2013-07-03 | Portable multi-component online monitor of gas dissolved in transformer oil |
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|---|---|---|---|
| CN201310278008XA CN103411920A (en) | 2013-07-03 | 2013-07-03 | Portable multi-component online monitor of gas dissolved in transformer oil |
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Cited By (14)
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|---|---|---|---|---|
| CN104062265A (en) * | 2014-07-14 | 2014-09-24 | 山东电力设备有限公司 | Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis |
| CN104165880A (en) * | 2014-08-20 | 2014-11-26 | 国家电网公司 | Online detecting method of dissolved gas in transformer oil |
| CN104458640A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Transformer fault diagnosis method and system based on online monitored data of optical fiber gas sensor |
| CN105738310A (en) * | 2016-04-20 | 2016-07-06 | 华北理工大学 | Device and method for detecting concentrations of SO2, NO2 and NO in dust environment |
| CN105866055A (en) * | 2016-03-28 | 2016-08-17 | 国网山东省电力公司东营市东营区供电公司 | Method for diagnosing oil-filled electrical equipment |
| CN107167450A (en) * | 2017-07-17 | 2017-09-15 | 上海禾楷电气科技有限公司 | Gas in Oil of Transformer and micro- water on-line detecting system |
| CN107167428A (en) * | 2017-07-17 | 2017-09-15 | 上海禾楷电气科技有限公司 | A kind of absorption cell detected for gas |
| CN108519349A (en) * | 2018-03-30 | 2018-09-11 | 东北石油大学 | Oil field gas injection multielement hot fluid component CO2And H2O concentration on-line checking experimental provisions |
| CN109540840A (en) * | 2019-01-22 | 2019-03-29 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of sulfur hexafluoride decomposition gas-detecting device |
| CN109781627A (en) * | 2019-03-18 | 2019-05-21 | 大连世有电力科技有限公司 | Wall-mount transformer oil dissolved gas on-Line Monitor Device based on laser detection |
| CN112213266A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Laser monitoring device with laser instrument function that adjusts temperature |
| RU206646U1 (en) * | 2020-10-27 | 2021-09-20 | Общество С Ограниченной Ответственностью "Бо-Энерго.Автоматизированные Системы Оценки Технического Состояния" | GAS ANALYZER FOR GASES DISSOLVED IN OIL BASED ON DIODE-LASER ABSORPTION SPECTROMETER AND NON-DISPERSIVE INFRARED ANALYZER |
| CN113804650A (en) * | 2021-09-18 | 2021-12-17 | 中国特种设备检测研究院 | Monitoring device and monitoring method |
| CN114047132A (en) * | 2022-01-11 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell for multi-gas detection |
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| CN104062265A (en) * | 2014-07-14 | 2014-09-24 | 山东电力设备有限公司 | Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis |
| CN104165880A (en) * | 2014-08-20 | 2014-11-26 | 国家电网公司 | Online detecting method of dissolved gas in transformer oil |
| CN104165880B (en) * | 2014-08-20 | 2016-09-21 | 国家电网公司 | A kind of online test method of Gases Dissolved in Transformer Oil |
| CN104458640A (en) * | 2014-12-25 | 2015-03-25 | 中国西电电气股份有限公司 | Transformer fault diagnosis method and system based on online monitored data of optical fiber gas sensor |
| CN105866055A (en) * | 2016-03-28 | 2016-08-17 | 国网山东省电力公司东营市东营区供电公司 | Method for diagnosing oil-filled electrical equipment |
| CN105738310A (en) * | 2016-04-20 | 2016-07-06 | 华北理工大学 | Device and method for detecting concentrations of SO2, NO2 and NO in dust environment |
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| CN107167450A (en) * | 2017-07-17 | 2017-09-15 | 上海禾楷电气科技有限公司 | Gas in Oil of Transformer and micro- water on-line detecting system |
| CN107167428A (en) * | 2017-07-17 | 2017-09-15 | 上海禾楷电气科技有限公司 | A kind of absorption cell detected for gas |
| CN108519349A (en) * | 2018-03-30 | 2018-09-11 | 东北石油大学 | Oil field gas injection multielement hot fluid component CO2And H2O concentration on-line checking experimental provisions |
| CN109540840A (en) * | 2019-01-22 | 2019-03-29 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of sulfur hexafluoride decomposition gas-detecting device |
| CN109781627A (en) * | 2019-03-18 | 2019-05-21 | 大连世有电力科技有限公司 | Wall-mount transformer oil dissolved gas on-Line Monitor Device based on laser detection |
| CN112213266A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Laser monitoring device with laser instrument function that adjusts temperature |
| CN112213266B (en) * | 2020-09-29 | 2021-05-14 | 湖北鑫英泰系统技术股份有限公司 | Laser monitoring device with laser instrument function that adjusts temperature |
| RU206646U1 (en) * | 2020-10-27 | 2021-09-20 | Общество С Ограниченной Ответственностью "Бо-Энерго.Автоматизированные Системы Оценки Технического Состояния" | GAS ANALYZER FOR GASES DISSOLVED IN OIL BASED ON DIODE-LASER ABSORPTION SPECTROMETER AND NON-DISPERSIVE INFRARED ANALYZER |
| CN113804650A (en) * | 2021-09-18 | 2021-12-17 | 中国特种设备检测研究院 | Monitoring device and monitoring method |
| CN114047132A (en) * | 2022-01-11 | 2022-02-15 | 山东省科学院激光研究所 | Long-optical-path gas absorption cell for multi-gas detection |
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Application publication date: 20131127 |