CN103791848A - Transformer winding monitoring system based on optical fiber sensing technology - Google Patents
Transformer winding monitoring system based on optical fiber sensing technology Download PDFInfo
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- CN103791848A CN103791848A CN201410019488.2A CN201410019488A CN103791848A CN 103791848 A CN103791848 A CN 103791848A CN 201410019488 A CN201410019488 A CN 201410019488A CN 103791848 A CN103791848 A CN 103791848A
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Abstract
The invention belongs to the technical field of photoelectron measurement and provides a transformer winding monitoring system based on the optical fiber sensing technology. Optical fibers (3) are arranged in a winding (1) of a transformer (2), and the optical fibers (3) are relatively fixed to the winding (1), a plurality of Bragg optical gratings (4) are manufactured on the optical fibers, the optical fibers (3) are connected with one end of an optical fiber coupler (5), the other end of the optical fiber coupler (5) is provided with two led out optical fibers respectively connected with a Raman scattering optical fiber interrogator (9) through an photoswitch A(6), and a photoswitch B(7) is connected with an optical fiber Bragg optical grating interrogator (8). According to the transformer winding monitoring system, temperature of the optical fibers beside the Bragg optical gratings is utilized to conduct temperature compensation on the central wavelength shift of the Bragg optical gratings, the two monitoring methods are combined to achieve real-time monitoring of temperature and strain of the winding, and the fault point of a transformer winding can be located.
Description
Technical field
The present invention relates to a kind of Transformer Winding monitoring system based on optical fiber sensing technology, belong to photoelectron field of measuring technique.
Background technology
Power transformer, as one of most important electrical equipment in electric system, safeguards that its normal operation is the basic guarantee of whole system reliable power supply.In recent years, along with the raising of China's expanding economy and living standards of the people, need for electricity rapid growth, the jumbo future development of electric system forward UHV (ultra-high voltage), transformer fault rate also increases thereupon.Therefore, understanding in time the running status of transformer, to contingent diagnosing malfunction and maintenance, is the important measures that reduce transformer operation troubles, improve security of system.But, the existing requirement that can not meet power supply reliability take preventive trial as main inspection and repair system of China.Along with the technology such as the development of photoelectron technology and sensor, computing machine, information processing are in the infiltration in each field, power system monitoring technology changes online continuous monitoring into gradually from the periodic monitoring of off-line, its objective is the running status of Real-Time Monitoring transformer, judge whether its operation is normal, diagnose its inside to have character, the type of fault, and predict the development trend of fault.
The winding of power transformer is a vitals of transformer, and due to the increase of transformer capacity, its heat problem is more and more outstanding, and Transformer Winding temperature is often higher than 6 ℃ of standard temperature values, will reduce half the serviceable life of transformer; Sometimes, service time is long, capacity is excessive etc., and reason can cause Transformer Winding to deform, and this will have a strong impact on normal operation and the serviceable life of transformer, therefore monitors significant to the winding of transformer.But the temperature of Transformer Winding is not uniform distribution, the temperature difference of difference, the former monitoring transformer top-oil temperature that passes through calculates that the method for the temperature of Transformer Winding difference has larger error, and real-time is poor.
Optical fiber sensing technology is the technology of the light signal in optical fiber being carried out to modulation /demodulation, and this kind of technology has the features such as high, the quasi-distributed or distributed measurement of high pressure resistant, anti-electromagnetic interference (EMI), real-time, is suitable for Transformer Winding monitoring.And FBG Sensing Technology, Brillouin scattering optical fiber sensing technology all exist temperature and strain cross sensitivity problem, Raman scattering optical fiber sensing technology can only be monitored temperature, cannot react the strain conditions of transformer.Above reason has caused the application development of optical fiber sensing technology in Transformer Winding monitoring slow.
Summary of the invention
The object of the invention provides a kind of just in order to overcome the defect that above-mentioned prior art exists can realize strain to winding and two parameter measurements of temperature, the accurate location of trouble spot, the Transformer Winding monitoring system based on optical fiber sensing technology that anti-electromagnetic interference capability is strong.
The present invention seeks to realize by following technical solution.
A kind of Transformer Winding monitoring system based on optical fiber sensing technology, feature of the present invention is: laying optical fiber in the winding of transformer, and make winding relative with optical fiber fixing, on optical fiber, be manufactured with multiple Bragg gratings, optical fiber is connected with fiber coupler one end, and the fiber coupler other end arranges two and draws optical fiber respectively by photoswitch A and Raman scattering optical fiber (FBG) demodulator phase repeatedly; Photoswitch B is connected with optical fiber Bragg raster (FBG) demodulator.
Photoswitch of the present invention and photoswitch have one at the most in opening state, and the two can not be simultaneously in opening state.
Optical fiber Bragg raster (FBG) demodulator of the present invention is measured the centre wavelength of the Bragg grating in the winding of transformer during in opening state at photoswitch, and the drift of the centre wavelength by Bragg grating reflects strain and the state of temperature of winding in transformer; Raman scattering optical fiber (FBG) demodulator carries out temperature monitoring to optical fiber at photoswitch during in opening state.
The present invention is in the time adopting Raman scattering optical fiber (FBG) demodulator to carry out temperature monitoring to optical fiber, and the centre wavelength of the light that Raman scattering optical fiber (FBG) demodulator adopts is all not identical with the centre wavelength of all Bragg gratings on optical fiber.
The present invention is in the time of the winding generation deformation of transformer or temperature rising phenomenon, can there is corresponding drift in the centre wavelength of the Bragg grating of its correspondence position, adopt Raman scattering optical fiber (FBG) demodulator to detect near the fiber optic temperature this Bragg grating, use this temperature to carry out to the centre wavelength drift of Bragg grating strain and the temperature conditions that temperature compensation can reflect winding.Another two kinds of modes all can realize the timely location to trouble spot.
In the time that photoswitch is opened, optical fiber Bragg raster (FBG) demodulator is monitored the centre wavelength of the Bragg grating on optical fiber.In the time that photoswitch is opened, photoswitch is closed, now Raman scattering optical fiber (FBG) demodulator send with the centre wavelength of all Bragg gratings all not identical light optical fiber is carried out to temperature monitoring.Because Transformer Winding is immersed in the insulating oil of transformer, therefore, very the temperature in the winding in small distance is close, can use the temperature of the optical fiber on Bragg grating limit to carry out temperature compensation to Bragg grating, namely use the temperature of the optical fiber that Raman scattering (FBG) demodulator monitors, can carry out temperature compensation to the centre wavelength drift of the Bragg grating of optical fiber Bragg raster (FBG) demodulator monitoring.Use the method can realize temperature to Bragg grating and the monitoring respectively of strain, and can realize the distributed monitoring to optical fiber temperature along the line.And Transformer Winding all can be attended by the variation of deformation or temperature while being damaged situation, monitors the running status that can reflect Transformer Winding by the temperature to winding and strain.In addition, this system also can be carried out in time the trouble spot of winding, accurately be located.
beneficial effect of the present invention:
1, two parameter measurements of the strain of winding and temperature: this system is carried out temperature compensation by Raman scattering optical fiber sensing technology to Bragg grating demodulation technology, have realized the strain of winding and two parameter measurements of temperature.
2, the accurate location of trouble spot: because this system has been laid multiple Bragg gratings, use wavelength-division multiplex and time-division multiplex technology to position trouble spot, another Raman scattering optical fiber monitoring technology is a kind of distributed temperature monitoring technology, and this technology also can accurately be located optical fiber temperature anomaly point along the line.
3, anti-electromagnetic interference capability is strong: this system adopts optical fiber sensing technology to monitor winding, and demodulated equipment can be positioned over the position away from from transformer, and anti-electromagnetic interference capability is strong.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, each label represents successively: transformer (1), Transformer Winding (2), optical fiber (3), Bragg grating (4), fiber coupler (5), photoswitch (6) and (7), optical fiber Bragg raster (FBG) demodulator (8), Raman scattering optical fiber (FBG) demodulator (9).
Embodiment
A kind of Transformer Winding monitoring system based on optical fiber sensing technology, feature of the present invention is: laying optical fiber 3 in the winding 1 of transformer 2, and make winding 1 relative with optical fiber 3 fixing, on optical fiber, be manufactured with multiple Bragg gratings 4, optical fiber 3 is connected with fiber coupler 5 one end, and fiber coupler 5 other ends arrange two and draw optical fiber respectively by photoswitch A6 and Raman scattering optical fiber (FBG) demodulator 9 phases repeatedly; Photoswitch B7 is connected with optical fiber Bragg raster (FBG) demodulator 8.
Photoswitch 6 of the present invention and photoswitch 7 have one at the most in opening state, and the two can not be simultaneously in opening state.
Optical fiber Bragg raster (FBG) demodulator 8 of the present invention is measured the centre wavelength of the Bragg grating 4 in the winding 1 of transformer 2 during in opening state at photoswitch 7, and the drift of the centre wavelength by Bragg grating 4 reflects strain and the state of temperature of the interior winding 1 of transformer 2; Raman scattering optical fiber (FBG) demodulator 9 carries out temperature monitoring to optical fiber 3 at photoswitch 6 during in opening state.
The present invention is in the time adopting Raman scattering optical fiber (FBG) demodulator 9 to carry out temperature monitoring to optical fiber 3, and the centre wavelength of the light that Raman scattering optical fiber (FBG) demodulator 9 adopts is all not identical with the centre wavelength of all Bragg gratings 4 on optical fiber 3.
The present invention is in the time there is deformation or temperature rising phenomenon in the winding 1 of transformer 2, can there is corresponding drift in the centre wavelength of the Bragg grating of its correspondence position, adopt Raman scattering optical fiber (FBG) demodulator 8 to detect near the fiber optic temperature this Bragg grating, use this temperature to carry out to the centre wavelength drift of Bragg grating strain and the temperature conditions that temperature compensation can reflect winding.Another two kinds of modes all can realize the timely location to trouble spot.
In the time that photoswitch 7 is opened, optical fiber Bragg raster (FBG) demodulator 8 is monitored the centre wavelength of the Bragg grating 4 on optical fiber 3.In the time that photoswitch 6 is opened, photoswitch 7 is closed, now Raman scattering optical fiber (FBG) demodulator 9 send with the centre wavelength of all Bragg gratings 4 all not identical light optical fiber 3 is carried out to temperature monitoring.Because Transformer Winding 1 is immersed in the insulating oil of transformer 2, therefore, very the temperature in the winding in small distance is close, can use the temperature of the optical fiber on Bragg grating 4 limits to carry out temperature compensation to Bragg grating, namely use the temperature of the optical fiber 3 that Raman scattering (FBG) demodulator 9 monitors, temperature compensation is carried out in the centre wavelength drift of the Bragg grating 4 that can monitor optical fiber Bragg raster (FBG) demodulator 8.Use the method can realize temperature to Bragg grating 4 and the monitoring respectively of strain, and can realize the distributed monitoring to optical fiber 3 temperature along the line.And Transformer Winding all can be attended by the variation of deformation or temperature while being damaged situation, monitors the running status that can reflect Transformer Winding by the temperature to winding and strain.In addition, this system also can be carried out in time the trouble spot of winding, accurately be located.
Referring to Fig. 1, laying optical fiber 3 in the winding 1 of transformer 2, and make winding 1 relative with optical fiber 3 fixing, on optical fiber, be manufactured with multiple Bragg gratings 4, optical fiber 3 is connected with fiber coupler 5 one end, draws optical fiber and is connected with Raman scattering optical fiber (FBG) demodulator 9 with optical fiber Bragg raster (FBG) demodulator 8 with 7 by photoswitch 6 respectively for two of fiber coupler 5 other ends.
In the time that photoswitch 7 is opened, optical fiber Bragg raster (FBG) demodulator 8 is monitored the centre wavelength of the Bragg grating 4 on optical fiber 3.In the time that photoswitch 6 is opened, photoswitch 7 is closed, now Raman scattering optical fiber (FBG) demodulator 9 send with the centre wavelength of all Bragg gratings 4 all not identical light optical fiber 3 is carried out to temperature monitoring.The temperature of the optical fiber 3 that utilization Raman scattering (FBG) demodulator 9 monitors, temperature compensation is carried out in the centre wavelength drift of the Bragg grating 4 that optical fiber Bragg raster (FBG) demodulator 8 is monitored.Can realize like this temperature to Bragg grating and the monitoring of strain, thus the state of reflection Transformer Winding.And use wavelength-division multiplex, time-division multiplex technology to position the failure exception point of Bragg grating, use Raman scattering optical fiber monitoring technology also can position optical fiber temperature anomaly point along the line.
Claims (1)
1. the Transformer Winding monitoring system based on optical fiber sensing technology, it is characterized in that: laying optical fiber (3) in the winding (1) of transformer (2), and make winding (1) relative fixing with optical fiber (3), on optical fiber, be manufactured with multiple Bragg gratings (4), optical fiber (3) is connected with fiber coupler (5) one end, and fiber coupler (5) other end arranges two and draws optical fiber respectively by photoswitch A(6) with Raman scattering optical fiber (FBG) demodulator (9) phase repeatedly; Photoswitch B(7) be connected with optical fiber Bragg raster (FBG) demodulator (8).
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Cited By (8)
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| CN106091970A (en) * | 2016-06-03 | 2016-11-09 | 中国电力科学研究院 | Monitoring device and there is the transformator of this monitoring device |
| CN106091969A (en) * | 2016-06-03 | 2016-11-09 | 中国电力科学研究院 | Monitoring device and there is the transformator of this monitoring device |
| CN106771839A (en) * | 2016-12-31 | 2017-05-31 | 武汉隽龙科技股份有限公司 | Deformation of transformer winding distributed on line monitoring system and method |
| CN107564700A (en) * | 2017-09-16 | 2018-01-09 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of optical fiber walks the fixing means of line process in inside transformer |
| CN108444625A (en) * | 2018-06-25 | 2018-08-24 | 云南电网有限责任公司昭通供电局 | A kind of pulling force sensor and method for detecting ice coating for powerline ice-covering detection |
| CN109148128A (en) * | 2018-11-14 | 2019-01-04 | 国网河北省电力有限公司电力科学研究院 | Transformer and its winding |
| CN109297616A (en) * | 2018-10-12 | 2019-02-01 | 北京理工大学 | A kind of solenoid valve winding temperature measurement system and method based on distributing optical fiber sensing |
| CN110220614A (en) * | 2019-07-08 | 2019-09-10 | 华北电力大学（保定） | Transformer winding temperature measurement system and measurement method based on Raman scattering |
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| US6876786B2 (en) * | 2002-10-02 | 2005-04-05 | Cicese-Centro De Investigation | Fiber-optic sensing system for distributed detection and localization of alarm conditions |
| CN201852564U (en) * | 2010-01-12 | 2011-06-01 | 武汉烽火富华电气有限责任公司 | Distributed optical fiber on-line monitoring system for deformation and temperature of transformer winding |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091970A (en) * | 2016-06-03 | 2016-11-09 | 中国电力科学研究院 | Monitoring device and there is the transformator of this monitoring device |
| CN106091969A (en) * | 2016-06-03 | 2016-11-09 | 中国电力科学研究院 | Monitoring device and there is the transformator of this monitoring device |
| CN106771839A (en) * | 2016-12-31 | 2017-05-31 | 武汉隽龙科技股份有限公司 | Deformation of transformer winding distributed on line monitoring system and method |
| CN107564700A (en) * | 2017-09-16 | 2018-01-09 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of optical fiber walks the fixing means of line process in inside transformer |
| CN107564700B (en) * | 2017-09-16 | 2020-03-13 | 华北电力大学（保定） | Method for fixing optical fiber in wiring process inside transformer |
| CN108444625A (en) * | 2018-06-25 | 2018-08-24 | 云南电网有限责任公司昭通供电局 | A kind of pulling force sensor and method for detecting ice coating for powerline ice-covering detection |
| CN108444625B (en) * | 2018-06-25 | 2023-09-08 | 云南电网有限责任公司昭通供电局 | Tension sensor for detecting icing of power transmission line and icing detection method |
| CN109297616A (en) * | 2018-10-12 | 2019-02-01 | 北京理工大学 | A kind of solenoid valve winding temperature measurement system and method based on distributing optical fiber sensing |
| CN109148128A (en) * | 2018-11-14 | 2019-01-04 | 国网河北省电力有限公司电力科学研究院 | Transformer and its winding |
| CN110220614A (en) * | 2019-07-08 | 2019-09-10 | 华北电力大学（保定） | Transformer winding temperature measurement system and measurement method based on Raman scattering |
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Application publication date: 20140514 |