CN102721847B - Hybrid grating on-line temperature measurement type all-fiber current transformer and current detection method thereof - Google Patents
Hybrid grating on-line temperature measurement type all-fiber current transformer and current detection method thereof Download PDFInfo
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- CN102721847B CN102721847B CN201210198824.5A CN201210198824A CN102721847B CN 102721847 B CN102721847 B CN 102721847B CN 201210198824 A CN201210198824 A CN 201210198824A CN 102721847 B CN102721847 B CN 102721847B
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Abstract
The invention relates to a hybrid grating on-line temperature measurement type all-fiber current transformer, which comprises a current detection optical path and a temperature detection optical path, wherein the current detection optical path comprises a light source, a polarization-maintaining coupler, a phase modulator, a polarization beam combiner, a polarization-maintaining transmission optical fiber and a sensing head which are connected in sequence; the temperature detection optical path comprises the light source, the polarization-maintaining coupler, an optical circulator, a single-mode transmission optical fiber and the sensing head which are connected in sequence; the light source, the polarization-maintaining coupler and the sensing head are shared by the two optical paths; the two optical paths also comprise a common photoelectric conversion modulation and demodulation unit; and the photoelectric conversion modulation and demodulation unit is connected with the polarization-maintaining coupler and the optical circulator respectively. According to the hybrid grating on-line temperature measurement type all-fiber current transformer, the temperature of the sensing head can be measured in real time, and accurate and reliable correction can be performed on a measurement result of the current transformer.
Description
Technical field
The present invention relates to a kind of equipment of electric current in conductor being measured by optical means and detection method thereof, belong to electric power application and technical field of optical fiber sensing.
Background technology
All-fiber current transformator is high-voltage great-current measurement mechanism of new generation, and it adopts the fiber optic materials with natural good insulating performance as sensing and transfer element.Sensing unit does not have electronic circuit, does not need power supply, is a kind of passive current sensor.All-fiber current transformator tool compared with conventional current mutual inductor has the following advantages: measure bandwidth; Dynamic range is large; Good insulation preformance; Cause the danger of high pressure without open circuit; Not containing iron core, there is no ferromagnetic resonance, magnetic saturation and the large caused hysteresis phenomenon of inductance; Not oil-containing, does not have explosion danger; Be subject to electromagnetic interference influence little; Volume is little, lightweight, simple in structure.
All-fiber current transformator to the measurement of electric current based on Ampere law and Faraday electromagnetic induction principle.When sensor fibre is arranged in while having the magnetic field that electric current passes through to form, according to Faraday electromagnetic induction principle, current information can be transformed in the phase place of two bundle circularly polarized lights, produces Faraday phase differential.In the time that two bundle circularly polarized lights are transferred to sensor fibre end, produce mirror-reflection, (the left-handed change dextrorotation of two-beam modes swap, dextrorotation become left-handed) after return along original optical path, Faraday effect doubles because of nonreciprocity, and again convert the linearly polarized light of two bundle orthogonal modes at quarter wave plate place, at the polarizer, place interferes.
Although all-fiber current transformator has the incomparable advantage of conventional current mutual inductor, but because quarter wave plate, optical fiber Verdet constant in its light path have temperature dependency, cause stability and the measuring accuracy of current detecting to be affected, this has limited the application of optical fiber type current mutual inductor to a great extent.
Summary of the invention
The object of this invention is to provide a kind of hybrid grating temperature measurement on-line type all-fiber current transformator and the electric current detecting method thereof that can measure in real time the temperature of sensing head and then the measurement result of current transformer is carried out accurately, reliably revised.
To achieve these goals, the technical solution used in the present invention is: a kind of hybrid grating temperature measurement on-line type all-fiber current transformator, comprise current detecting light path and temperature detection light path, current detecting light path comprises the light source being linked in sequence, polarization-maintaining coupler, phase-modulator, polarization beam combiner, protect inclined to one side Transmission Fibers and sensing head, temperature detection light path comprises the light source being linked in sequence, polarization-maintaining coupler, optical circulator, single-mode transmission optical fiber and sensing head, described light source, polarization-maintaining coupler and sensing head are shared by two light paths, described two light paths also comprise shared opto-electronic conversion modem module, described opto-electronic conversion modem module is connected with optical circulator with described polarization-maintaining coupler respectively.
The interference signal that in described current detecting light path, the light of forward transmission and the light of reverse transfer occur in phase-modulator, for the detection of current signal to be measured; In described temperature detection light path, there is the reflecting light with temperature information through fiber grating reflection, for the online temperature compensation of current signal.
Described light source is ASE light source.
Described phase-modulator is lithium niobate phase modulator.
Described sensing head comprises two sense lines, current sense circuit and temperature sensing circuit.Described current sense circuit is made up of quarter wave plate, low-birefringence sensor fibre and faraday's catoptron of being arranged on low-birefringence sensor fibre end; Described temperature sensor line route is with the single-mode fiber composition of fiber grating.Described two sense lines are annular, are jointly packaged in the quartz glass tube that is full of inert gas, and described quartz glass tube outside is coated with cushion, and cushion outside is sensing head skeleton; The same annular location of described sensing head skeleton, cushion and quartz glass tube is provided with opening, and the inclined to one side Transmission Fibers of described guarantor is connected with the quarter wave plate of current sense circuit and the single-mode fiber of temperature sensing circuit respectively by described opening with single-mode transmission optical fiber; The annular sense line central authorities of described sensing head are also provided with the rod that confluxes.
Further, the opening part of described sensing head skeleton is provided with sealing rubber ring.
Described opto-electronic conversion modem module comprises detector, OCM module, modulation-demodulation circuit and conversion output interface; Described modulation-demodulation circuit comprises the analog to digital converter, data processing unit and the digital to analog converter that are linked in sequence, described data processing unit is also connected with described conversion output interface, the interior analog compensation algorithm with sensing head temperature influence of described data processing unit; Described detector one end is connected with polarization-maintaining coupler, and received current detects the interference signal occurring in phase-modulator in light path, and the other end is connected with the analog to digital converter of modulation-demodulation circuit, and interference signal is carried out to modulation and demodulation; Described OCM module one end is connected with optical circulator, receives the reflecting light with temperature information in temperature detection light path, and the other end is connected with the data processing unit of modulation-demodulation circuit, and temperature information is carried out to online compensation; Described OCM module is made up of spectro-grating, detector array and electronic processing unit, adopts dense wavelength division multiplexing DWDM technology that optical wavelength is changed and converts electric signal analysis conversion output to.
Further, the working temperature of described sensing head is-40 DEG C～+ 60 DEG C.
An electric current detecting method for hybrid grating temperature measurement on-line type all-fiber current transformator, comprises the steps: that (1) carry out humid test to hybrid grating temperature measurement on-line type all-fiber current transformator, obtains analog compensation algorithm; (2) analog compensation algorithm is embedded to the data processing unit of hybrid grating temperature measurement on-line type all-fiber current transformator; (3) use hybrid grating temperature measurement on-line type all-fiber current transformator to detect electric current to be measured, output detections result.
Described analog compensation algorithm obtains by the following method: the sensing head of hybrid grating temperature measurement on-line type all-fiber current transformator is put into temperature test chamber by (1), regulates the electric current that confluxes in rod to reference current; (2) temperature of adjustment temperature test chamber records temperature value and gathers the current data of exporting after sensing head temperature stabilization; (3) make the temperature of temperature test chamber to rise on certain temperature interval, record the output current data of each temperature spot by step (2); (4) temperature-current data test being obtained is carried out modeling, according to models fitting backoff algorithm, and backoff algorithm is revised, and obtains analog compensation algorithm.
Further, described data processing unit is FPGA control chip.
Further, the temperature range of described temperature test chamber is adjusted into-40 DEG C～+ 60 DEG C, and described temperature interval is adjusted into 10 DEG C.
The invention has the beneficial effects as follows: 1) proposed a kind ofly to solve optical fiber current mutual inductor temperature and affect the new approaches of problem; 2) sensing head has combined electric current and two light paths of temperature realize two kinds of physical parameter parallel measurements; 3) realize all-fiber current transformator online compensation and solved its engineering application major limitation problem; 4) light path design has farthest reduced cost, two public light sources of light path; 5) system temperature compensation, without to electric power field test, is debugged without secondary after system balance, and directly on-the-spot installation, uses manpower and material resources sparingly.
Brief description of the drawings
Fig. 1 is the structural representation of the hybrid grating temperature measurement on-line of the present invention type all-fiber current transformator.
Fig. 2 is sensing head inner structure schematic diagram of the present invention.
Fig. 3 is opto-electronic conversion modem module structural representation of the present invention.
Fig. 4 is OCM module fundamental diagram.
Fig. 5 is modulation-demodulation circuit fundamental diagram.
Fig. 6 is Temperature Modeling test schematic diagram.
Fig. 7 is effect contrast figure before and after temperature compensation.
Embodiment
Below in conjunction with accompanying drawing, a kind of embodiment of the present invention is made to brief description.
As Fig. 1, a kind of hybrid grating temperature measurement on-line type all-fiber current transformator, comprise current detecting light path and temperature detection light path, current detecting light path comprises the light source 1 being linked in sequence, polarization-maintaining coupler 2, phase-modulator 3, polarization beam combiner 4, protect inclined to one side Transmission Fibers 5 and sensing head 6, temperature detection light path comprises the light source 1 being linked in sequence, polarization-maintaining coupler 2, optical circulator 7, single-mode transmission optical fiber 8 and sensing head 6, described light source 1, polarization-maintaining coupler 2 and sensing head 6 are shared by two light paths, described two light paths also comprise shared opto-electronic conversion modem module 9, described opto-electronic conversion modem module 9 is connected with ring of light shape 7 devices with described polarization-maintaining coupler 2 respectively.
In the present embodiment, described light source 1 is ASE light source.
Wherein, as Fig. 1 and 2, described sensing head 6 comprises two sense lines, current sense circuit and temperature sensing circuit.Described current sense circuit is made up of quarter wave plate 611, low-birefringence sensor fibre 612 and faraday's catoptron 613 of being arranged on low-birefringence sensor fibre 612 ends; Described temperature sensor line route forms with the single-mode fiber 621 of fiber grating 622.Described two sense lines are annular, are jointly packaged in the quartz glass tube 64 that is full of inert gas 63, and described quartz glass tube 64 outsides are coated with cushion 65, and cushion 65 outsides are sensing head skeleton 66; The same annular location of described sensing head skeleton 66, cushion 65 and quartz glass tube 64 is provided with opening 67, and the inclined to one side Transmission Fibers 5 of described guarantor is connected with the quarter wave plate 611 of current sense circuit and the single-mode fiber 621 of temperature sensing circuit respectively by described opening 67 with single-mode transmission optical fiber 8; The annular sense line central authorities of described sensing head 6 are also provided with the rod 68 that confluxes.Further, described sensing skull, 66 opening 67 places are provided with sealing rubber ring 69.
As Fig. 3, described opto-electronic conversion modem module 9 comprises detector 91, OCM module 92, modulation-demodulation circuit 93 and conversion output interface 94; Wherein, as Fig. 5, described modulation-demodulation circuit 93 comprises the analog to digital converter 931, data processing unit 932 and the digital to analog converter 933 that are linked in sequence, described data processing unit 932 is also connected with described conversion output interface 94, the interior analog compensation algorithm with sensing head 6 temperature influences of described data processing unit 932; Described detector 91 one end are connected with polarization-maintaining coupler 2, and received current detects the interference signal of phase-modulator 3 interior generations in light path, and the other end is connected with the analog to digital converter 931 of modulation-demodulation circuit 93, and interference signal is carried out to modulation and demodulation; Described OCM module 92 one end are connected with optical circulator 2, receive the reflecting light with temperature information in temperature detection light path, and the other end is connected with the data processing unit 932 of modulation-demodulation circuit 93, and temperature information is carried out to online compensation; As Fig. 4, described OCM module 92 is made up of spectro-grating 921, detector array 922 and electronic processing unit 923, adopts dense wavelength division multiplexing DWDM technology that optical wavelength is changed and converts electric signal analysis conversion output to.
Method of work of the present invention is as follows: ASE light source 1 produces a wide range light beam, and through polarization-maintaining coupler, 2 beam splitting are two-beam, and light beam signal enters phase-modulator 3 as current sense application, and another light beam enters optical circulator 7 and applies as temperature sensing.The light that enters phase-modulator 3 is transformed into linearly polarized light and is divided into two, the modulation signal modulation that the modulated line 95 of light phase applies, after modulation two bundle output light enters respectively two input ends of polarization beam combiner 4, polarization divides bundling device 4 that two bunch polarized lights are merged on two orthogonal optical axises of same output optical fibre, light beam after merging is transferred to optical fiber sensor head 6 parts through the transmission polarization maintaining optical fibre 5 of certain distance, the quarter wave plate 611 that closes two polarization signal photocurrent sense lines of bundle is converted into respectively left circularly polarized light and right-circularly polarized light, then enter low-birefringence sensor fibre 612 and arrive faraday's catoptron 613, after the reflection of faraday's catoptron, two bundle rotatory polarization light reflect to reverse transfer, now the polarization state of two-beam exchanges at reflex time, be that former left circularly polarized light becomes right-circularly polarized light, former right-circularly polarized light becomes left circularly polarized light.Polarization signal is twice process low-birefringence sensor fibre 612 back and forth, in the time having electric current to pass through in fluid confluence 68, can be transformed in the phase place of two bundle polarized lights according to Faradic electricity magnetic induction principle current information, due to Faraday effect have nonreciprocity therefore induced signal can double.The two bundle polarized lights that are loaded with current information again turn back to quarter wave plate 611 and can again be converted to again the orthogonal linearly polarized light of two bundles, divide bundling device 4 that linearly polarized light orthogonal two bundles is injected into respectively in two optical fiber through polarization, light oppositely enters phase-modulator 3 and interferes, the detector 91 that interference signal is input to opto-electronic conversion modem module 9 receives, be converted to electric signal, data processing unit 932 through modulation-demodulation circuit 93 calculates output feedback signal, is applied to phase-modulator 3 through modulation lines 95.The light signal that enters optical circulator 7 forward transmission arrives the fiber grating 622 in sensing head 6 through single-mode transmission optical fiber 8, the optical wavelength that fiber grating 622 reflects is relevant with the residing temperature of grating, the light signal of what fiber grating reflected be loaded with temperature information oppositely turns back to optical circulator 7 through single-mode transmission optical fiber 8, optical circulator 7 outputs to the signal of oppositely passing back the OCM module 92 of opto-electronic conversion modem module 9, first the spectro-grating 921 of OCM module 92 carries out incident light spectral resolution (space), detector array 922 receives the light signal after decomposing and it is carried out to opto-electronic conversion, electronic processing unit 923 is further by the electric signal analysis after conversion conversion output.Electric signal through electronic processing unit 923 conversion outputs is sent into modulation-demodulation circuit 93, and the data processing unit 932 of modulation-demodulation circuit 93 is embedded with analog compensation algorithm, after according to algorithm, temperature information being compensated, is exported by conversion output interface 94.
As Fig. 6, described analog compensation algorithm obtains by the following method: temperature test chamber 101 put into by the sensor 6 of hybrid grating temperature measurement on-line type all-fiber current transformator by (1), regulate conflux rod 68 in electric current to reference current; (2) adjust the temperature of temperature test chamber 101, after sensing head temperature stabilization, record temperature value and gathered the current data of output by data acquisition system (DAS) 103; (3) make the temperature of temperature test chamber 101 to rise on certain temperature interval, record the output current data of each temperature spot by step (2); (4) temperature-current data test being obtained is carried out modeling, according to models fitting backoff algorithm, and backoff algorithm is revised, and obtains analog compensation algorithm.
Wherein, comprehensive demodulating system 102 shown in Fig. 6 is the part of the hybrid grating temperature measurement on-line of the present invention type all-fiber current transformator except sensing head.
In the present embodiment, the scope of analog compensation algorithm collecting temperature information is-40 DEG C～+ 60 DEG C, carries out a data acquisition at interval of 10 DEG C, and the temperature-current data obtaining is carried out after modeling, and the compensation effect obtaining as shown in Figure 7.Wherein, the measured value that normalization constant multiplier SF is electric current and the ratio of actual value.
In the present embodiment, described data processing unit is FPGA control chip.
Above an example of the present invention is had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variation and improvement etc. of doing according to the present patent application scope, within all should still belonging to patent covering scope of the present invention.
Claims (8)
1. a hybrid grating temperature measurement on-line type all-fiber current transformator, is characterized in that: comprise current detecting light path and temperature detection light path; Described current detecting light path comprises the inclined to one side Transmission Fibers of light source, polarization-maintaining coupler, phase-modulator, polarization beam combiner, guarantor and the sensing head that are linked in sequence; Described temperature detection light path comprises the light source, polarization-maintaining coupler, optical circulator, single-mode transmission optical fiber and the sensing head that are linked in sequence; Described light source, polarization-maintaining coupler and sensing head are shared by two light paths; Described two light paths also comprise shared opto-electronic conversion modem module, and described opto-electronic conversion modem module is connected with optical circulator with described polarization-maintaining coupler respectively;
The interference signal that in described current detecting light path, the light of forward transmission and the light of reverse transfer occur in phase-modulator, for the detection of current signal to be measured; In described temperature detection light path, there is the reflecting light with temperature information through fiber grating reflection, for the online temperature compensation of current signal;
Described sensing head comprises two sense lines, current sense circuit and temperature sensing circuit; Described current sense circuit is made up of quarter wave plate, low-birefringence sensor fibre and faraday's catoptron of being arranged on low-birefringence sensor fibre end; Described temperature sensor line route is with the single-mode fiber composition of fiber grating; Described two sense lines are annular, are jointly packaged in the quartz glass tube that is full of inert gas, and described quartz glass tube outside is coated with cushion, and cushion outside is sensing head skeleton; The same annular location of described sensing head skeleton, cushion and quartz glass tube is provided with opening, and the inclined to one side Transmission Fibers of described guarantor is connected with the quarter wave plate of current sense circuit and the single-mode fiber of temperature sensing circuit respectively by described opening with single-mode transmission optical fiber;
Described opto-electronic conversion modem module comprises detector, OCM module, modulation-demodulation circuit and conversion output interface.
2. hybrid grating temperature measurement on-line type all-fiber current transformator according to claim 1, is characterized in that: the opening part of described sensing head skeleton is provided with sealing rubber ring, and the annular sense line central authorities of described sensing head are also provided with the rod that confluxes.
3. hybrid grating temperature measurement on-line type all-fiber current transformator according to claim 1, it is characterized in that: described modulation-demodulation circuit comprises the analog to digital converter, data processing unit and the digital to analog converter that are linked in sequence, described data processing unit is also connected with described conversion output interface, the interior analog compensation algorithm with sensing head temperature influence of described data processing unit;
Described detector one end is connected with polarization-maintaining coupler, and received current detects the interference signal occurring in phase-modulator in light path, and the other end is connected with the analog to digital converter of modulation-demodulation circuit, and interference signal is carried out to modulation and demodulation;
Described OCM module one end is connected with optical circulator, receives the reflecting light with temperature information in temperature detection light path, and the other end is connected with the data processing unit of modulation-demodulation circuit, and temperature information is carried out to online compensation; Described OCM module is made up of spectro-grating, detector array and electronic processing unit, adopts dense wavelength division multiplexing DWDM technology that optical wavelength is changed and converts electric signal analysis conversion output to.
4. according to the hybrid grating temperature measurement on-line type all-fiber current transformator described in claim 1-3 any one, it is characterized in that: described light source is ASE light source.
5. according to the hybrid grating temperature measurement on-line type all-fiber current transformator described in claim 1-3 any one, it is characterized in that: described phase-modulator is lithium niobate phase modulator.
6. hybrid grating temperature measurement on-line type all-fiber current transformator according to claim 3, is characterized in that: described data processing unit is FPGA control chip.
7. according to the hybrid grating temperature measurement on-line type all-fiber current transformator described in claim 1-3 any one, it is characterized in that: the working temperature of described sensing head is-40 DEG C～+ 60 DEG C.
8. the electric current detecting method of hybrid grating temperature measurement on-line type all-fiber current transformator as claimed in claim 3, comprise the steps: that (1) carry out humid test to hybrid grating temperature measurement on-line type all-fiber current transformator, obtain analog compensation algorithm; (2) analog compensation algorithm is embedded to the data processing unit of hybrid grating temperature measurement on-line type all-fiber current transformator; (3) use hybrid grating temperature measurement on-line type all-fiber current transformator to detect electric current to be measured, output detections result.
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| CN202661524U (en) * | 2012-06-15 | 2013-01-09 | 天津光拓科技有限公司 | Hybrid grating online temperature measurement type all-fiber current transformer |
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| KR100575244B1 (en) * | 2004-12-07 | 2006-05-02 | 엘에스산전 주식회사 | Temperature compensating optical current transformer using fiber bragg grating |
| US20110052115A1 (en) * | 2009-08-27 | 2011-03-03 | General Electric Company | System and method for temperature control and compensation for fiber optic current sensing systems |
| US20120007584A1 (en) * | 2010-07-12 | 2012-01-12 | Honeywell International Inc. | Fiber current sensor with reduced temperature sensitivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216502A (en) * | 2008-01-18 | 2008-07-09 | 北京航空航天大学 | Wave plate temperature compensation system suitable for optical fibre current mutual inductor |
| CN101692401A (en) * | 2009-09-04 | 2010-04-07 | 北京齐瑞得电力技术有限公司 | Optical fiber current transformer with optical fiber temperature acquisition and temperature compensation |
| CN202661524U (en) * | 2012-06-15 | 2013-01-09 | 天津光拓科技有限公司 | Hybrid grating online temperature measurement type all-fiber current transformer |
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