CN103076070A - Ice coating detection device for cable - Google Patents
Ice coating detection device for cable Download PDFInfo
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- CN103076070A CN103076070A CN2013100022152A CN201310002215A CN103076070A CN 103076070 A CN103076070 A CN 103076070A CN 2013100022152 A CN2013100022152 A CN 2013100022152A CN 201310002215 A CN201310002215 A CN 201310002215A CN 103076070 A CN103076070 A CN 103076070A
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Abstract
The invention relates to a weight detection device, in particular to an ice coating detection device for a cable. The ice coating detection device comprises a fiber grating wavelength modulator, an optical divider and a fiber grating weighing sensor, wherein the fiber grating wavelength modulator is connected with the optical divider through a signal transmission optical cable; the optical divider is connected with the fiber grating weighing sensor through a signal transmission optical cable; the upper end of the fiber grating weighing sensor is fixedly suspended, and the lower end of the fiber grating weighing sensor is connected with the cable; an elastic body is arranged in the middle of the fiber grating weighing sensor; the elastic body is provided with the fiber grating sensor; a broadband light source is arranged in the fiber grating wavelength modulator; the broadband light source is transmitted to the fiber grating sensor through a signal transmission optical cable; the fiber grating sensor is used for transmitting a wavelength signal of reflected light of the broadband light source to the fiber grating wavelength modulator; and the fiber grating wavelength modulator is used for obtaining the weight change of the cable according to a received wavelength signal. Due to the adoption of the ice coating detection device, the ice coating condition of the cable can be effectively detected.
Description
Technical field
The present invention relates to a kind of Weight detecting device, is a kind of cable ice coating pick-up unit specifically.
Background technology
Fiber grating is the photosensitivity of utilizing fiber optic materials, method by ultraviolet photoetching writes fiber core with incident light coherent field pattern, in fibre core, produce along the axial refractive index cycle variation of fibre core, thereby form the phase grating in permanent space, its effect forms in fact an arrowband (transmission or reflection) wave filter or catoptron in fibre core.When beamwidth spectral light process fiber grating, the wavelength (bragg wavelength) that satisfies the fiber grating Bragg condition will produce reflection, and remaining wavelength sees through fiber grating and continues transmission.When extraneous parameter changes, the effective refractive index of fiber grating and grating cycle and then change, thereby so that the bragg wavelength of fiber grating drifts about, the variation of extraneous parameter is changed into the drift of bragg wavelength, can realize the to external world measurement of parameter by detecting grating bragg wavelength drift value.
Optical fiber optical grating stress sensor namely utilizes the sensing principle of fiber grating, fiber grating is snugly fitted on the foil gauge, when effect of stress is to the foil gauge, foil gauge generation deformation, simultaneously fiber grating microdeformation, cause effective refractive index and the grating cycle of fiber grating to change, and then cause the bragg wavelength drift, realize corresponding force measurement.
The ice coating load is the biggest factor that destroys the power transmission line system, and ice covering on transmission lines can cause disconnected strand of power transmission line, broken string, fall between tower, lead wire and earth wire flashover, short circuit tripping operation and icing the harm such as waves, and gives society and produces and cause heavy losses.Serious powerline ice-covering disaster at home and abroad all once occured, and in Dec, 2000, in the Ukraine southeast, the icing disaster causes 300,000 cement shaft towers and 20,000 steel towers to damage; In November, 2005, WESTERN GERMANY area power transmission network meets with serious icing disaster, causes 83 collapse of iron towers, and 5 transmission lines of electricity are stopped transport; In Dec in the same year, snowstorm has attacked U.S. Appalachian Mountains in the neighbourhood, causes 700,000 residents outage, and industry and commerce paralyses; 2008, the rare large tracts of land icing in the world has affected tens provinces of south China, owing to continue sleet and snow ice weather, cause transmission line of electricity large tracts of land icing, the shaft tower broken string that collapses that can't bear the heavy load, power supply is interrupted on a large scale, and power equipment suffers unprecedented damage, and direct economic loss is above hundred billion yuan.
Overhead transmission line is carried out the on-line monitoring of ice coating state, can accurate recording ice coating process, scheduling network load before serious ice coating disaster occurs, the startup ice-melting device is effectively avoided the generation of disaster, and is significant.
Summary of the invention
Technical matters to be solved by this invention provides a kind of cable ice coating pick-up unit the ice coating state of cable is carried out Real Time Monitoring.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of cable ice coating pick-up unit, comprise optic fiber grating wavelength conciliation instrument, optical branching device and fiber grating LOAD CELLS, described wideband light source is the wide-band that American I R company provides, the high power stabilized light source of low degree of polarization, its wavelength band is boundless, can reach 350nm, described optic fiber grating wavelength is reconciled instrument and is connected optical branching device by the connection of signal light transmission cable, described optical branching device links to each other by the signal light transmission cable with described fiber grating LOAD CELLS, the upper end of described fiber grating LOAD CELLS is suspended on the object of level altitude, the lower end of described fiber grating LOAD CELLS links to each other with the cable that is detected, the part of described fiber grating LOAD CELLS is elastic body, described elastic body is provided with fiber-optic grating sensor, described elastic body bears the gravity of described detected cable, described optic fiber grating wavelength is reconciled in the instrument and is provided with wideband light source, described wideband light source is transferred to described fiber-optic grating sensor through the signal light transmission cable, described fiber-optic grating sensor is used for that the catoptrical wavelength signals of described wideband light source on described fiber-optic grating sensor passed to described optic fiber grating wavelength by the signal light transmission cable and reconciles instrument, described optic fiber grating wavelength is reconciled instrument and is drawn the elastomeric deformation quantity of described optical grating weighting transducer according to the wavelength signals that receives, and then variation has occured the weight that draws described detected cable.
The invention has the beneficial effects as follows: elastic body and optical grating weighting transducer are designed to one can prevent machining or contact uneven loss and the break-in that causes in the power transmittance process, use the passive optical fiber of intrinsic as signal transmission medium, efficiently solve the emc issue of traditional electrical minor pick-up unit, also solved the power supply supply problem of Test Field; The optical fiber good corrosion resistance, stable chemical performance does not need in the use procedure again to proofread and correct substantially, and ordinary life can reach more than 25 years; Fiber transmission attenuation is little, can realize detecting on a large scale and early warning by wavelength-division multiplex and time-multiplexed mode, can realize unusual accurate location, and construction is simple, can greatly reduce the whole cost demand of engineering.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described optic fiber grating wavelength is reconciled instrument and is also comprised coupling mechanism, photoswitch, photoelectric conversion module, signal processing module and data processing module, described coupling mechanism comprises signal input part, signal output part and signal interaction end, the input end of described coupling mechanism links to each other with the output terminal of described wideband light source, the signal interaction end of described coupling mechanism links to each other with described photoswitch, described photoswitch links to each other with described optical branching device by described signal light transmission cable, described photoswitch is used for signal is configured in respectively the upper transmission of the discrete periodic time interval, be that the time-division is multiplexing, the output terminal of described coupling mechanism links to each other with the input end of described photoelectric conversion module, described photoelectric conversion module converts the light signal that receives to electric signal, the output terminal of described photoelectric conversion module links to each other with the input end of described signal processing module, the output terminal of described signal processing module links to each other with described data processing module, described signal processing module is inputted data processing module after with the electric signal denoising that receives, described data processing module draws the elastomeric deformation quantity of described optical grating weighting transducer according to the electric signal after the denoising that receives, and then draws the weight change of described cable.
Further, described fiber-optic grating sensor comprises strain transducer and temperature sensor, described strain transducer links to each other with described optical branching device by one road signal light transmission cable, described temperature sensor links to each other with described optical branching device by another road signal light transmission cable, described strain transducer is used for obtaining wavelength signals, and described temperature sensor is used for measuring the temperature of current environment.
Adopt the beneficial effect of above-mentioned further scheme to be: to avoid fiber-optic grating sensor because the variation of environment temperature exerts an influence to measurement result, acquiring temperature sensor at fiber-optic grating sensor can measures ambient temperature, the impact that causes in order to revise environment temperature on fiber grating strain sheet.
Further, described strain transducer has two, described two strain transducers link to each other with described optical branching device respectively by the two paths of signals transmission cable, described optical branching device and described photoswitch use the mode of wavelength-division multiplex to carry out the signal transmission, described optic fiber grating wavelength is reconciled the elastomeric deformation quantity that instrument draws respectively described two strain transducers, and then draw two groups of weight change of described cable, get the mean value of described two groups of weight change as the weight change of described cable.
Adopt the beneficial effect of above-mentioned further scheme to be, the data of getting described strain transducer collection draw the mean value of two groups of weight change as the weight change of described cable, can reduce the measuring error of cable ice coating amount.
Further, described elastic body is closed U-lag structure, and described elastic body is " worker " font perpendicular to the xsect of the direction of suffered gravity.
Further, described two strain transducers are installed in respectively in the groove of U-lag on both sides of described worker's shape.
Adopt the beneficial effect of above-mentioned further scheme to be: elastic body is designed to the offset load resistance that closed U-lag structure can strengthen the fiber grating Weighing sensor elastomer; Elastic body is designed to " worker " font perpendicular to the xsect of the direction of suffered gravity, and two strain transducers is installed in respectively in the groove of U-lag on both sides of described worker's shape, can improve the accuracy of described strain transducer.
Further, the object of level altitude is the power tower bar, and the upper end of described fiber grating LOAD CELLS is suspended on the described power tower bar.
Further, described signal light transmission cable is Optical Fiber composite overhead Ground Wire, and described Optical Fiber composite overhead Ground Wire (being called for short OPGW:optical fiber composite overhead ground wire) refers to have the metal optical cable of electric power overhead ground wire and optical fiber communication ability dual-use function.
Adopt the beneficial effect of above-mentioned further scheme to be: to be convenient to field wiring, to take full advantage of the existing facilities available of electric system.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the topology view that optic fiber grating wavelength is reconciled instrument among the present invention;
Fig. 3 be among structural representation the present invention of the present invention the fiber grating LOAD CELLS perpendicular to the cross sectional representation of the direction of its suffered gravity.
In the accompanying drawing, arrow represents the direction of signal transmission, and the parts of each label representative are as follows:
1, optic fiber grating wavelength is reconciled instrument, and 2, the signal light transmission cable, 3, optical branching device, 4, the fiber grating LOAD CELLS, 5, elastic body, 6, strain transducer;
The input end of a, coupling mechanism, the signal interaction end of b, coupling mechanism, the output terminal of c, coupling mechanism.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used for explaining the present invention, is not be used to limiting scope of the present invention.
As shown in Figure 1, a kind of cable ice coating pick-up unit, comprise optic fiber grating wavelength conciliation instrument 1, optical branching device 3 and fiber grating LOAD CELLS 4, described optic fiber grating wavelength is reconciled instrument 1 and is connected optical branching device 3 by 2 connections of signal light transmission cable, described optical branching device 3 links to each other by the signal light transmission cable with described fiber grating LOAD CELLS 4, the upper end of described fiber grating LOAD CELLS 4 is suspended on the object of level altitude, the lower end of described fiber grating LOAD CELLS 4 links to each other with the cable that is detected, the part of described fiber grating LOAD CELLS 4 is elastic body, as shown in Figure 3, described elastic body 5 is provided with fiber-optic grating sensor, described elastic body 5 bears the gravity of described detected cable, described optic fiber grating wavelength is reconciled in the instrument 1 and is provided with wideband light source, described wideband light source is transferred to described fiber-optic grating sensor through signal light transmission cable 2, described fiber-optic grating sensor is used for that the catoptrical wavelength signals of described wideband light source on described fiber-optic grating sensor passed to described optic fiber grating wavelength by signal light transmission cable 2 and reconciles instrument 1, described optic fiber grating wavelength is reconciled instrument 1 and is drawn the deformation quantity of the elastic body 5 of described optical grating weighting transducer 4 according to the wavelength signals that receives, and then draws the weight change of described cable.
Fiber grating LOAD CELLS 4 is direct measure portion of this device, is installed between power tower bar and the cable, and as shown in Figure 1, the upper end is suspended on the power tower bar, and the lower end links to each other with the cable that is detected.The optic fiber grating wavelength (FBG) demodulator is the demodulation part of this device, generally can be installed in several kilometers even tens of kilometers control center in addition; Optic fiber grating wavelength (FBG) demodulator and fiber grating LOAD CELLS are distant, and the signal light transmission cable generally can adopt ubiquitous Optical Fiber composite overhead Ground Wire (OPGW) in the power overhead network; End in Optical Fiber composite overhead Ground Wire is connected with fiber grating LOAD CELLS and temperature sensor by optical branching device.
As shown in Figure 2, described optic fiber grating wavelength is reconciled instrument and is also comprised coupling mechanism, photoswitch, photoelectric conversion module, signal processing module and data processing module, described coupling mechanism comprises signal input part, signal output part and signal interaction end, the input end of described coupling mechanism links to each other with the output terminal of described wideband light source, the signal interaction end of described coupling mechanism links to each other with described photoswitch, described photoswitch links to each other with described optical branching device by described signal light transmission cable, the output terminal of described coupling mechanism links to each other with the input end of described photoelectric conversion module, described photoelectric conversion module converts the light signal that receives to electric signal, the output terminal of described photoelectric conversion module links to each other with the input end of described signal processing module, the output terminal of described signal processing module links to each other with described data processing module, described signal processing module is inputted data processing module after with the electric signal denoising that receives, described data processing module draws the elastomeric deformation quantity of described optical grating weighting transducer according to the electric signal after the denoising that receives, and then draws the weight change of described cable.
Wideband light source links to each other with the input end a of coupling mechanism; The signal interaction end b of coupling mechanism connects photoswitch, every road output of photoswitch all connects one road signal light transmission cable, end at the signal light transmission cable connects an optical branching device, every road output of optical branching device all connects a fiber grating, each fiber grating LOAD CELLS comprises 3 fiber gratings (2 are used for FBG strain gauge, and 1 is used for the temperature correction); The output terminal c of coupling mechanism connects the light input end of photoelectric conversion module, and the output terminal of photoelectric conversion module connects the input end of signal processing module, the output terminal connection data sampling and processing module of signal processing module.
The broadband light that the wideband light source of optic fiber grating wavelength (FBG) demodulator 1 sends enters photoswitch through coupling mechanism, enters which bars transmission cable by photoswitch control light signal, realizes the time division multiplex of light signal; Light signal enters optical branching device through the signal light transmission cable, and light signal is divided into impartial several parts through optical branching device, enters simultaneously a plurality of fiber-optic grating sensors; The light that satisfies the fiber-optic grating sensor conditioned reflex turns back to coupling mechanism along same optical path, enter photoelectric conversion module through the output terminal c of coupling mechanism end, through photoelectric conversion module the light signal that is reflected back is converted to electric signal, this electric signal entering signal processing module enters data processing module after further denoising, the shaping; The data that collect are through the demodulation of dedicated test demodulation software, obtain the centre wavelength of the light that fiber-optic grating sensor is reflected back; Variation has occured in the deformation that the center wavelength variation by the strain transducer in the fiber grating LOAD CELLS can draw Weighing sensor elastomer, and variation has occured the weight that further can obtain cable, has namely reached the detection of cable ice coating amount.
Described fiber-optic grating sensor comprises strain transducer 6 and temperature sensor, described strain transducer links to each other with described optical branching device by one road signal light transmission cable, described temperature sensor links to each other with described optical branching device by another road signal light transmission cable, described strain transducer is used for obtaining wavelength signals, and described temperature sensor is used for measuring the temperature of current environment.
Fiber-optic grating sensor is the photosensitivity of utilizing fiber optic materials, and the method by ultraviolet photoetching writes fibre core with incident light coherent field pattern, produces along the axial refractive index cycle variation of fibre core in fibre core, thereby forms the phase grating in permanent space.
In the transmission course of wideband light source, fiber-optic grating sensor is equivalent to the optical filter of a reflection-type, by extraneous parameter the external information amount is obtained in the modulation of the wavelength of fiber-optic grating sensor, is a kind of fiber-optic grating sensor of wavelength-modulated type; When wideband light source transmitted in fiber-optic grating sensor, the wavelength that wavelength satisfies formula 1 was called centre wavelength, and described centre wavelength will be reflected back:
λ
B=2n
EffΛ formula 1
In the formula 1, λ
BBe reflection wave centre wavelength, n
EffBe the effective refractive index of fibre core, Λ is the grating cycle.
Strain transducer is attached on the foil gauge by certain technique by fiber-optic grating sensor and consists of, when the elastic body of fiber grating LOAD CELLS stressed and when deformation occurs, can cause the grating periods lambda of fiber-optic grating sensor to change, the centre wavelength of the light that can obtain being reflected back by the data processing module in the optic fiber grating wavelength (FBG) demodulator, further can obtain the centre wavelength drift that the fiber grating reflected light causes because the grating periods lambda changes, central wavelength lambda
BChange the deformation that obtains strain transducer on sending out variation has occured, also with regard to having drawn the weight of bringing because of the cable ice coating variation has occured.
Described strain transducer has two, described two strain transducers link to each other with described optical branching device respectively by the two paths of signals transmission cable, described optical branching device and described photoswitch use the mode of wavelength-division multiplex to carry out the signal transmission, described optic fiber grating wavelength is reconciled the elastomeric deformation quantity that instrument draws respectively described two strain transducers, and then draw two groups of weight change of described cable, get the mean value of described two groups of weight change as the weight change of described cable.
2 FBG strain gauges 6 of placement are average by the deformation quantity of these 2 foil gauges in each fiber grating LOAD CELLS, can reduce the measuring error of cable ice coating amount.Place a fiber grating measures ambient temperature near the fiber grating LOAD CELLS, the impact that FBG strain gauge is caused to remove environment temperature further improves the present invention to the measuring accuracy of cable ice coating amount.
Described elastic body 5 is closed U-lag structure, and described elastic body is " worker " font perpendicular to the xsect of the direction of suffered gravity, as shown in Figure 3.
Described two strain transducers 6 are installed in respectively in the groove of U-lag on both sides of described worker's shape.
The object of level altitude is the power tower bar, and the upper end of described fiber grating LOAD CELLS is suspended on the described power tower bar.
Described signal light transmission cable is Optical Fiber composite overhead Ground Wire.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. cable ice coating pick-up unit, it is characterized in that, comprise optic fiber grating wavelength conciliation instrument, optical branching device and fiber grating LOAD CELLS, described optic fiber grating wavelength is reconciled instrument and is connected optical branching device by the connection of signal light transmission cable, described optical branching device links to each other by the signal light transmission cable with described fiber grating LOAD CELLS, the upper end of described fiber grating LOAD CELLS is suspended on the object of level altitude, the lower end of described fiber grating LOAD CELLS links to each other with the cable that is detected, the part of described fiber grating LOAD CELLS is elastic body, described elastic body is provided with fiber-optic grating sensor, bear the gravity of described detected cable by described elastic body, described optic fiber grating wavelength is reconciled in the instrument and is provided with wideband light source, described wideband light source is transferred to described fiber-optic grating sensor through the signal light transmission cable, described fiber-optic grating sensor is used for that the catoptrical wavelength signals of described wideband light source on described fiber-optic grating sensor passed to described optic fiber grating wavelength by the signal light transmission cable and reconciles instrument, described optic fiber grating wavelength is reconciled instrument and is drawn the elastomeric deformation quantity of described optical grating weighting transducer according to the wavelength signals that receives, and then the weight that draws described detected cable changes.
2. a kind of cable ice coating pick-up unit according to claim 1, it is characterized in that, described optic fiber grating wavelength is reconciled instrument and is also comprised coupling mechanism, photoswitch, photoelectric conversion module, signal processing module and data processing module, described coupling mechanism comprises signal input part, signal output part and signal interaction end, the input end of described coupling mechanism links to each other with the output terminal of described wideband light source, the signal interaction end of described coupling mechanism links to each other with described photoswitch, described photoswitch links to each other with described optical branching device by described signal light transmission cable, the output terminal of described coupling mechanism links to each other with the input end of described photoelectric conversion module, described photoelectric conversion module converts the light signal that receives to electric signal, the output terminal of described photoelectric conversion module links to each other with the input end of described signal processing module, the output terminal of described signal processing module links to each other with described data processing module, described signal processing module is inputted data processing module after with the electric signal denoising that receives, described data processing module draws the elastomeric deformation quantity of described optical grating weighting transducer according to the electric signal after the denoising that receives, and then the weight that draws described detected cable changes.
3. a kind of cable ice coating pick-up unit according to claim 1, it is characterized in that, described fiber-optic grating sensor comprises strain transducer and temperature sensor, described strain transducer links to each other with described optical branching device by one road signal light transmission cable, described temperature sensor links to each other with described optical branching device by another road signal light transmission cable, described strain transducer is used for obtaining wavelength signals, and described temperature sensor is used for measuring the temperature of current environment.
4. a kind of cable ice coating pick-up unit according to claim 3, it is characterized in that, described strain transducer has two, described two strain transducers link to each other with described optical branching device respectively by the two paths of signals transmission cable, described optical branching device and described photoswitch use the mode of wavelength-division multiplex to carry out the signal transmission, described optic fiber grating wavelength is reconciled the elastomeric deformation quantity that instrument draws respectively described two strain transducers, and then drawing two groups of weight change of described detected cable, the mean value of getting described two groups of weight change is as the weight change of described detected cable.
5. a kind of cable ice coating pick-up unit according to claim 4 is characterized in that, described elastic body is closed U-lag structure, and described elastic body is " worker " font perpendicular to the xsect of the direction of suffered gravity.
6. a kind of cable ice coating pick-up unit according to claim 4 is characterized in that, described two strain transducers are installed in respectively in the groove of U-lag on both sides of described worker's shape.
7. according to claim 1 to 6 arbitrary described a kind of cable ice coating pick-up units, it is characterized in that the object of level altitude is the power tower bar, the upper end of described fiber grating LOAD CELLS is suspended on the described power tower bar.
8. according to claim 1 to 6 arbitrary described a kind of cable ice coating pick-up units, it is characterized in that described signal light transmission cable is Optical Fiber composite overhead Ground Wire.
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| CN103630263A (en) * | 2013-08-16 | 2014-03-12 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for monitoring OPGW online with the use of optical fiber sensing technology |
| CN103956701A (en) * | 2014-04-29 | 2014-07-30 | 刘化交 | Multifunctional charged intelligent ice melting system |
| CN104880269A (en) * | 2014-02-28 | 2015-09-02 | 国家电网公司 | Overhead line detection system and fiber grating weighing sensor thereof |
| CN105606870A (en) * | 2015-11-11 | 2016-05-25 | 重庆大学 | Wavelength division multiplexing type non-contact online voltage monitoring system for power transmission line |
| CN106338242A (en) * | 2015-07-15 | 2017-01-18 | 成都阜特科技股份有限公司 | Wind generating set blade icing amount measuring method and measuring device |
| CN108872806A (en) * | 2018-06-07 | 2018-11-23 | 华南理工大学 | A method of measurement composite insulator icing degree |
| CN109039449A (en) * | 2018-08-22 | 2018-12-18 | 安徽问天量子科技股份有限公司 | A kind of detection method and its detection device of fiber optic cable icing |
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Application publication date: 20130501 |