CN201047858Y - High intensity effect type full optical fiber reflection type optical current mutual inductor - Google Patents
High intensity effect type full optical fiber reflection type optical current mutual inductor Download PDFInfo
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- CN201047858Y CN201047858Y CNU200720153637XU CN200720153637U CN201047858Y CN 201047858 Y CN201047858 Y CN 201047858Y CN U200720153637X U CNU200720153637X U CN U200720153637XU CN 200720153637 U CN200720153637 U CN 200720153637U CN 201047858 Y CN201047858 Y CN 201047858Y
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Abstract
The utility model provides a high light intensity benefit type full-optical-fiber reflection optical current sensor and a method which use a full-optical-fiber optical interference method to measure the current in a high-voltage transmission line, and can precisely measure the current in a high-voltage environment with the interference factors of a stray magnetic field, a temperature, and a vibration. The utility model comprises a photoelectricity unit, an optical fiber transmission line unit, and an optical fiber sensing unit which are connected; wherein, the photoelectricity unit generates a detecting optical beam, and detects a return and induced waiting-detection current signal and processes and sends out the signal; the optical fiber transmission line unit transmits the beam to the optical fiber sensing unit; the optical fiber sensing unit is positioned at a high-voltage area to induce the waiting-detection current. In the photoelectricity unit, a keep polarization optical ring-shape device is used to increase the benefit of a bandwidth optical source. Because of the Faraday magnetic-optical effect, the magnetic field generated by the current in a high-voltage current-carrying bus-line conductor causes two round polarized lights which are used as detecting beams and have opposite rotation directions to mutually generate a phase difference which is in direct ratio to the waiting-detection current, thereby the interference light intensity determined by the phase difference is analyzed and processed to get the waiting-detection current value.
Description
Technical field
The utility model belongs to field of photoelectric technology, and it relates to a kind of full fiber reflection formula optical current sensor, is used for measuring electric current with the full-optical fiber optical interference technique, particularly measures the electric current of ultra-high-tension power transmission line.
Background technology
The technology of accurately measuring electric current with the full-optical fiber optical method in high voltage environment is being widely studied in power industry and will progressively entering application in recent years.Compare with used conventional art, the main advantage of optical measuring technique is:
Insensitive to electromagnetic interference (EMI); Excellent electrical insulation properties; Bigger bandwidth; Higher dynamic range; In light weight; Volume is little; Higher precision; Safe operating conditions etc.;
Used full fiber reflection formula optical current mutual inductor scheme during other is studied at present, send light beam at light source and enter the incident end of surveying light path, and the light beam that just returns being reflected leaves the exit end of surveying light path and has utilized and protect the inclined to one side optical fiber coupling optical splitter of inclined to one side or non-guarantor, its effect is that incident light partly is coupled into the detection light path, and makes the light that returns partly enter photo-detector.These two processes have caused a large amount of losses as the light intensity that super-radiance light emitting diode provides of low-coherence light source.In the existing scheme, only because the application of fiber coupler is gone through only remaining below 1/4th of light intensity that light source provides of light intensity that full detection light path can bring back to the useful signal of being sensed photodetector thereby come and go.
In full fiber reflection formula optical current sensor, the broadband, high-power, the use of high stability light source is absolutely necessary: reduce forward direction and advance light with dorsad between the Rayleigh scattering and the coherent disturbance of cross-couplings formation between two cross polarization propagating modes of light beam; Guarantee that the optical current sensor entire system has sufficiently high sensitivity and precision; The long-term stability of wavelength and light intensity; These several factors that overall performance is played a crucial role all depend on light source itself considerably.Therefore the requirement for full fiber reflection formula optical current sensor light source is quite harsh, and the light source that consequently satisfies these conditions costs an arm and a leg, complex structure, and also difficulty is buied.
The actual ultra-high-tension power transmission line overwhelming majority is a three-phase, and each electric current in mutually all needs independently to measure, and promptly every phase all needs to equip one group of optical current sensor of this type of light source.Obviously, if adopt used full fiber reflection formula optical current mutual inductor scheme in the research at present, because a large amount of losses of light intensity that above-mentioned light source provides just can only every assembling be equipped with a light source, this will increase cost greatly, and the global reliability of the sizable reduction of meeting system.For reducing cost and increase system-wide global reliability, yet the shared one group of light source of the optical current sensor of all each phases is from reasonably.This just further requires to make full use of the light intensity that above-mentioned light source provides.
For reducing cost and increasing system-wide global reliability, the shared one group of light source of related optical current sensor and optical voltage sensor is rationally and actual selection equally.This same requirement makes full use of the light intensity that above-mentioned light source provides.
Under the prerequisite of the utility model full fiber reflection formula optical current mutual inductor all properties in reaching existing scheme fully its light path is formed structure and make change, make the benefit of utilizing that can improve its light source according to the novel full fiber reflection formula optical current mutual inductor of the utility model structure significantly, overcome the shortcoming in the existing scheme, thereby reduced full fiber reflection formula optical current sensor construction cost and increase system-wide global reliability.
The utility model content
The purpose of this utility model just provides a kind of full fiber reflection formula interferometer type optical current sensor.
In order to realize the purpose of this utility model, a kind of full fiber reflection formula interferometer type optical current sensor is provided, be used for measuring big electric current with the full-optical fiber optical interference technique.A kind of full fiber reflection formula of high light intensity benefit type optical current mutual inductor with electric current in the full-optical fiber optical interference technique measurement ultra-high-tension power transmission line, it comprises:
Photovoltaic element;
The optical fiber transmission line unit;
The fiber-optic current sensor unit;
The mutual successively light of described photovoltaic element, optical fiber transmission line unit and fiber-optic current sensor unit connects and composes the full fiber reflection formula of high light intensity benefit type optical current mutual inductor;
Wherein said photovoltaic element provides the light beam that is applicable to detection, the optical fiber transmission line unit with above-mentioned light beam from the photovoltaic element forward transmitted to the fiber-optic current sensor unit that is in the high-voltage region, the above-mentioned light beam sensing of fiber-optic current sensor unit by using is by the to be measured electric current of its optical fiber institute closed-loop in current, and this light beam is returned again oppositely enter described photovoltaic element through the optical fiber transmission line unit, described photovoltaic element detects the current signal to be measured in the described light beam and is converted into electric signal output; Described photovoltaic element comprises that also protecting polarisation for one learns circulator, all passes through this guarantor's polarisation and learns circulator in described detection light beam forward, the reverse travel path.
Photovoltaic element comes out the beam detection that is loaded with the current signal to be measured of sensing after oppositely returning by the optical fiber transmission line unit then, and is converted into electric signal and outputs to Signal Data Processor, calculates by analysis and obtains current value to be measured.
Above-mentioned photovoltaic element comprises wideband light source, guarantor's polarisation circulator, fibre optic polarizer, polarization maintaining optical fibre depolarizer, optical birefringence phase-modulator, signal generator, photoelectric detector and the Signal Data Processor of polarization light output.
Above-mentioned photovoltaic element all utilizes same guarantor's polarisation to learn circulator in detecting light beam forward, reverse travel path, to improve the utilization benefit of its wideband light source significantly.
The linearly polarized light beam forward that is sent by wideband light source is transferred to fibre optic polarizer through protecting polarisation circulator, behind polarization maintaining optical fibre 45 degree welds, be divided into two equal orhtogonal linear polarizaiton light from the linearly polarized light of wherein outgoing and enter the polarization maintaining optical fibre depolarizer, in order to suppress the above-mentioned propagation parasitic cross polarization coupling in the way of between same guarantor compiles two crossed polarized lights in the optical fiber, advancing, spread into the optical birefringence phase-modulator subsequently respectively; The above-mentioned optical birefringence phase-modulator of modulation signal that provides according to signal generator carries out synchronous modulation to two orhtogonal linear polarizaiton light, is transferred to the fiber-optic current sensor unit via the polarization maintaining optical fibre lag line subsequently; The light beam that is loaded with current signal to be measured that returns through reflection by the fiber-optic current sensor unit produces interference at fibre optic polarizer, this interference light oppositely is transferred to photoelectric detector by protecting after polarisation is learned circulator, is converted into therein to obtain current value to be measured through the signal data processing again after electric signal is exported.
Above-mentioned photovoltaic element can also add in case of necessity by feedback control circuit, and optical birefringence phase-modulator and the closed loop phase modulation (PM) part that forms are to improve the signal to noise ratio (S/N ratio) and the stability of system.
Constituting of optical fiber transmission line unit: polarization maintaining optical fibre optical cable; Built-in polarization maintaining optical fibre section; High-Voltage Insulation structure, preceding two parts form the polarization maintaining optical fibre lag line altogether in light path.
The polarization maintaining optical fibre optical cable is transferred to High-Voltage Insulation structure place with the light beam of above-mentioned photovoltaic element output from the observing and controlling chamber at its place; Built-in polarization maintaining optical fibre section is positioned at the High-Voltage Insulation inside configuration; above-mentioned light beam is transferred to the fiber-optic current sensor unit that is arranged in high-voltage region from low-voltage end: described built-in polarization maintaining optical fibre section is interconnected to constitute by the optical fiber of the optical cable packaging protection that the structure and material of several sections varying strengths forms; neither be subjected to the disturbance of various external carbuncles when the light beam of surveying usefulness is propagated therein, can satisfy the requirement of High-Voltage Insulation again.The High-Voltage Insulation structure makes the light beam of above-mentioned photovoltaic element output be able to be transferred to the fiber-optic current sensor unit by the polarization maintaining optical fibre section that is built in wherein, provides good insulation performance for the fiber-optic current sensor unit that is in the high-voltage region simultaneously.
The fiber-optic current sensor unit is in the high voltage environment zone, is made up of opticator and encapsulating structure, and its opticator is connected to form by following optics: the optics quarter-wave plate, and it can be that full optical fiber constitutes, and also can constitute with micro-optical device; Based on the induct sensor fibre circle in magnetic field that electric current to be measured generates of Faraday magnetooptical effect; At the catoptron of this fiber turns end face, form by fiber end face reflection plated film usually; Will lay respectively at the catoptron of the optics quarter-wave plate at sensor fibre circle two ends and sensor fibre circle other end as far as possible near placing, thereby make sensor fibre circle sealing ground around at least one circle of high-tension current bus-bars conductor or whole numbers of turns so that induct and only induct magnetic field that electric current to be measured generates; Wherein, the optics quarter-wave plate is used for two orthogonal linear polarisation light of polarization maintaining optical fibre lag line transmission are converted to two circularly polarized lights that sense of rotation is opposite, these two circularly polarized lights by the sensor fibre circle after on catoptron by total reflection, and exchange sense of rotation mutually, return along the backpropagation of sensor fibre circle then.When oppositely by the optics quarter-wave plate, the opposite circularly polarized light of two sense of rotation that exchanges mutually after the sense of rotation is converted to two orthogonal linear polarisation light of backpropagation again, but it is axial to exchange its linear polarization.
Its encapsulating structure is used for: support and lay opticator; Constitute the conductor that electric current to be measured passes through; Prevent and lower the interference of extraneous various disturbance these opticses.
Can obtain from Amp: determine along the current value that integrated value that magnetic field is done is only passed among the loop thus around any enclosed loop of current-carrying conductor:
So by the sensor fibre circle be arranged in the optics quarter-wave plate at sensor fibre circle two ends and this current value to be measured just can be determined by the current-carrying conductor magnetic field that electric current to be measured generates of only inducting thus around at least one circle of high-tension current bus-bars conductor or whole numbers of turns in sealing ground, any loop that catoptron constitutes, and be not subjected to the disturbing effect in magnetic field that current-carrying conductor produces and other extraneous stray magnetic field outside any sensor fibre circle.
Owing to sensor fibre circle sealing ground around at least one circle of high pressure current carrying bus conductor or the whole numbers of turns magnetic field that electric current to be measured generates of inducting, the diameter dimension of sensor fibre circle, geometric configuration, current do not influence the current value to be measured that is measured with respect to the orientation and the position of sensor fibre circle.
The magnetic field forward and reverse in succession propagation circularly polarized light that above-mentioned two sense of rotation are opposite because of Faraday magnetooptical effect makes that electric current in the high pressure current carrying bus conductor produces produces a phasic difference that is directly proportional with electric current to be measured each other:
Δφ＝4VNI
And in fibre optic polarizer generation interference, so the interference light intensity that drops on the photo-detector is:
If utilize the correlation method demodulation, then when enough hour of this phasic difference, it is directly proportional with a order harmonic component after photo-detector is exported the electric signal demodulation:
V
1∝J
1(φ
m)(4VNI)
Because in each amount, V and N are all known, J in the following formula
1(φ
m) be that wherein corresponding argument is φ
mFirst-order bessel function.φ wherein (t)=φ
mCos (ω
mT) being the modulation signal of optical birefringence phase-modulator, is known quantity, J
1(φ
m) then be known, so can try to achieve the value of current value I to be measured from following formula.
So voltage signal V that current value to be measured can provide from Signal Data Processor corresponding to an order harmonic component
1Read.
Be the basis according to the above-mentioned interference light intensity expression formula that is converted to electric signal by photo-detector, the current value I to be measured in the high pressure current carrying bus conductor that can utilize multiple different signal demodulation mode to obtain wherein to be comprised.
Description of drawings
Fig. 1 is the full fiber reflection formula of the high light intensity benefit type optical current mutual inductor synoptic diagram with open loop phase modulation type structure
Fig. 2 protects polarisation and learns circulator operation synoptic diagram
Fig. 3 is the full fiber reflection formula of the high light intensity benefit type optical current mutual inductor synoptic diagram with closed loop phase modulation-type structure
The full fiber reflection formula of the high light intensity benefit of Fig. 4 type optical current mutual inductor one-piece construction synoptic diagram
Label declaration
1. super-radiance light emitting diode wideband light source
2. protect polarisation and learn circulator
3. online fibre optic polarizer
4. polarization maintaining optical fibre polarization axle 45 degree weldings
5. optical birefringence phase-modulator
6. polarization maintaining optical fibre lag line (optical fiber transmission line)
7. polarization maintaining optical fibre polarization axle 45 degree weldings
8. optical fiber quarter-wave plate
9. sensor fibre circle
10. catoptron
11. carry the conductor of electric current to be measured
12. photo-detector
13. modulation signal generator
14. Signal Data Processor
15. polarization maintaining optical fibre depolarizer
16. feedback control circuit
17. photovoltaic element
18. insulation cylinder base
19. built-in polarization maintaining optical fibre section
20. insulation cylinder
21. encapsulating structure
Door 1: protect polarisation and learn the circulator input/output port, the light beam that light source sends goes into to inject to protect polarisation circulator from door 1;
Door 2: protect polarisation and learn the circulator input/output port, the light beam that light source sends is learned the circulator outgoing from door 2 by protecting polarisation, and enters the optical fiber polarizer 3 and follow-up detection light path among this figure;
Door 3: protect polarisation and learn the circulator input/output port, the light beam that returns after reflection from the detection light path terminal oppositely enters guarantor's polarisation circulator by door 2, falls on the photo-detector after door 3 outgoing.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:
Referring to Fig. 1, the full fiber reflection formula of interferometer type described in the utility model optical current mutual inductor is by photovoltaic element, and optical fiber transmission line unit and fibre-optic current sensing unit connect and compose; Wherein, photovoltaic element provides the light beam that is applicable to detection, the optical fiber transmission line unit arrives the fiber-optic current sensor unit with this beam Propagation, the fiber-optic current sensor unit detect by its optical fiber around the electric current to be measured in the current, photovoltaic element comes out the beam detection of sense current signal to be measured then, and obtains current value to be measured through the Signal Data Processor analyzing and processing.
Photovoltaic element is protected polarisation and is learned circulator 2 at least by light source 1, online fibre optic polarizer 3, and polarization maintaining optical fibre depolarizer 15, optical birefringence phase-modulator 5, modulation signal generator 13, photo-detector 12 connects and composes.Referring to Fig. 1 and Fig. 2, the linearly polarized light of super-radiance light emitting diode wideband light source output enters via door 1 and protects polarisation circulator 2, gives online fibre optic polarizer 3 from its 2 outgoing and forward transmitted then.In this process, 50% light intensity was divided to fall when the linearly polarized light of light source 1 output was by employed fiber coupler wherein in prior art, just lost 50% light intensity.Yet in the utility model, the linearly polarized light of light source output enters guarantor's polarisation circulator 2 by door 1 and does not exist by the light intensity of dividing to fall and losing from the process of its 2 outgoing then.Protect polarisation and learn circulator 2 subsequently from the linearly polarized light of door 2 outgoing entering,, characterize other parameter of this beam optical state and all not have change as the function of detecting light beam except the polarization direction of incident, emergent light has relatively rotated 90 degree by door 1.The light beam that is returned by 10 reflections of light path terminal catoptron will oppositely become linearly polarized light by online fibre optic polarizer 3, learns door 2 incidents of circulator 2 from protecting polarisation, subsequently from its 3 outgoing.Except the polarization direction of incident, emergent light has relatively rotated 90 degree, characterize other parameter of this beam optical state and all not have to change, and do not exist and divided to fall the light intensity of losing in a large number when using fiber coupler as the function of detecting light beam.
Be divided into the linearly polarized light of two quadratures subsequently at polarization maintaining optical fibre polarization axle 45 degree weldings 4 places by the linearly polarized light of online fibre optic polarizer 3 outputs, and be transferred to optical birefringence phase-modulator 5 along the polarization axle x axle and the y axle of polarization maintaining optical fibre respectively.The polarization maintaining optical fibre depolarizer made from polarization maintaining optical fibre 15 is placed between 45 degree weldings 4 of polarization maintaining optical fibre polarization axle and the optical birefringence phase-modulator 5, is used for suppressing above-mentioned propagation and is coupled at the parasitic cross polarization in the way of advancing between two crossed polarized lights in the same polarization maintaining optical fibre.Optical birefringence phase-modulator 5 utilizes the birefringence of optical fiber above-mentioned two the orhtogonal linear polarizaiton light of verifying to carry out synchronous modulation under from the control of the modulation signal of modulation signal generator 13.The oscillation frequency of modulation signal is f=1/2 τ, and wherein τ is that above-mentioned two orhtogonal linear polarizaiton light came and went by the used time of polarization maintaining optical fibre lag line 6 and sensor fibre circle 9.Above-mentioned two orhtogonal linear polarizaiton light of modulated mistake propagate into the fiber-optic current sensor unit through polarization maintaining optical fibre lag line 6.The light beam reverse transfer of returning from the fiber-optic current sensor unit that is loaded with the current signal to be measured of sensing is to online fibre optic polarizer 3 and produce interference, this interfering beam oppositely is transferred to photo-detector 12 through protecting polarisation circulator 2, be converted into therein after electric signal outputs to Signal Data Processor 14, handle by analysis and obtain current value to be measured.
The fiber-optic current sensor unit is in the high voltage environment district of full fiber reflection formula optical current mutual inductor, and by optics quarter-wave plate 8, sensor fibre circle 9 is positioned at the catoptron 10 of sensor fibre circle 9 end faces, and does not mark the encapsulating structure that draws and form.Optics quarter-wave plate 8, it can be to make with full optical fiber, also can constitute with micro-optical device.The optics quarter-wave plate made from optical fiber 8 has bigger bandwidth, can be connected with front and back optical fiber better, and stability better.
Around high pressure current carrying bus conductor 11 some circles, used optical fiber can be common low birefringent fiber to sensor fibre circle 9 by its fiber optic loop, also can be ultra-low birefringence fiber or circle polarization maintaining optical fibre.The linearly polarized light that optics quarter-wave plate 8 will come from the optical fiber transmission line unit is converted to circularly polarized light, for example, the linearly polarized light of x axle is converted to right-circularly polarized light and the linearly polarized light of y axle is converted to left circularly polarized light.Since these two circularly polarized lights by the sensor fibre circle after on catoptron exchange sense of rotation mutually during by total reflection, and then return along the backpropagation of sensor fibre circle, so when these two circularly polarized lights along sensor fibre circle 9 forward before this, when becoming backpropagation because of reflection subsequently, 9 magnetic fields that produce around the electric current in the high pressure current carrying bus conductor 11 of sensor fibre circle produce a phasic difference each other because of Faraday magnetooptical effect makes the opposite circularly polarized light of these two sense of rotation, and its numerical values recited satisfies following formula:
Δφ＝4VNI (1)
Wherein: V is Wei Erde (Verdet) constant, and N is the number of turn of sensor fibre circle 9 around current carrying bus 11, and I is the electric current to be measured in the high pressure current carrying bus conductor 11.
The circularly polarized light that two sense of rotation of backpropagation are opposite is converted into two orhtogonal linear polarizaiton light through optics quarter-wave plate 8 again, and the exchange polarisation of light is axial.When backpropagation arrives online fibre optic polarizer 3, produce and interfere.Interference light by online fibre optic polarizer 3 outputs oppositely is transferred to photo-detector 12 through protecting after polarisation is learned circulator 2, and the light intensity of this interference light that photo-detector 12 is accepted is:
Wherein, I
dBe the light intensity that photo-detector 12 is accepted, I
sBe the light intensity that light source 1 sends, k is the loss of whole optical path,
φ(t)＝φ
mcos((·)
mt) (3)
Therefore, the current value I to be measured in the high pressure current carrying bus conductor 11 can draw from (2).
The light intensity of this interference light is converted to electric signal and outputs to Signal Data Processor 14 by photo-detector 12 subsequently.
To be converted to the light intensity expression (2) of the interference light of electric signal by photo-detector 12, the current value I to be measured in the high pressure current carrying bus conductor 11 that can utilize multiple different signal demodulation mode to obtain wherein to be comprised.
When the signal that utilizes the correlation method demodulation to obtain based on (2) formula, after the electric signal demodulation of the Signal Data Processor 14 of present embodiment with photo-detector 12 outputs, then when enough hour of this phasic difference, can utilize the one order harmonic component to draw to be proportional to the voltage signal of the current value I to be measured in the high pressure current carrying bus conductor 11:
V
1∝J
1(φ
m)(4VNI) (4)
Wherein, V
1Be the voltage signal that Signal Data Processor 14 provides corresponding to an order harmonic component, J
1(φ
m) be that wherein corresponding argument is φ
mFirst-order bessel function.Because modulation signal (3) is a known quantity, J
1(φ
m) then be known, so can obtain the value of current value I to be measured from (4) formula.
For removing the influence that light source 1 power swing causes current value I to be measured, the voltage signal V corresponding to single order and the second harmonic component that can utilize Signal Data Processor 14 to measure simultaneously
1(ω
m) and V
2(2 ω
m), and utilize corresponding J
1(φ
m), J
2(φ
m), be not subjected to the value of the current value I to be measured of light source output intensity influence of fluctuations:
The utility model can be used for the measurement to alternating current, also can be applied to the measurement to DC current.
Fig. 4 provides the synoptic diagram that each cell distribution of full fiber reflection formula optical current sensor described in the utility model is provided with.Photovoltaic element 17 all is placed in the observing and controlling chamber interior, by be in polarization maintaining optical fibre optical cable 6 in the outdoor optical fiber transmission line unit with the beam Propagation of above-mentioned photovoltaic element output to High-Voltage Insulation column structure base 18, be transferred to optics quarter-wave plate 8 in the fibre-optic current sensing unit by built-in polarization maintaining optical fibre section 19 via High-Voltage Insulation cylinder 20 inside configuration again, enter sensor fibre circle 9 and catoptron 10 subsequently around current 11.Be in all opticators in the high voltage environment and all put the sensor fibre circle 9 and the catoptron 10 of body 11.All opticators that are in the high voltage environment all are placed among the encapsulating structure 21,
It should be noted that at last: above embodiment only in order to the explanation the utility model, and and unrestricted the utility model; Therefore although when this instructions is with reference to above-mentioned each embodiment, the utility model is explained, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model; And all do not break away from the technical scheme and the improvement thereof of spirit and scope of the present utility model, all should be encompassed in the middle of the scope of the present utility model.
Claims (10)
1. the full fiber reflection formula of the high light intensity benefit type optical current mutual inductor with electric current in the full-optical fiber optical interference technique measurement ultra-high-tension power transmission line is characterized in that, comprising:
Photovoltaic element;
The optical fiber transmission line unit;
The fiber-optic current sensor unit;
The mutual successively light of described photovoltaic element, optical fiber transmission line unit and fiber-optic current sensor unit connects and composes the full fiber reflection formula of high light intensity benefit type optical current mutual inductor;
Wherein said photovoltaic element provides the light beam that is applicable to detection, the optical fiber transmission line unit with above-mentioned light beam from the photovoltaic element forward transmitted to the fiber-optic current sensor unit that is in the high-voltage region, the above-mentioned light beam sensing of fiber-optic current sensor unit by using by its optical fiber institute closed-loop around current in electric current to be measured, and this light beam is returned again oppositely enter described photovoltaic element through the optical fiber transmission line unit, described photovoltaic element detects the current signal to be measured in the described light beam and is converted into electric signal output; Described photovoltaic element comprises that also protecting polarisation for one learns circulator, all passes through this guarantor's polarisation and learns circulator in described detection light beam forward, the reverse travel path.
2. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor, it is characterized in that: described photovoltaic element comprises the wideband light source of the polarization light output of light connection successively, protects polarisation and learns circulator, fibre optic polarizer, polarization maintaining optical fibre depolarizer, optical birefringence phase-modulator, modulation signal generator, photo-detector and Signal Data Processor.
3. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor is characterized in that: between described wideband light source that sends linearly polarized light and the fibre optic polarizer and be provided with between fibre optic polarizer and the photo-detector and protect polarisation and learn circulator; The linearly polarized light beam forward that is sent by wideband light source wherein outputs to fibre optic polarizer by its door 2 again from protecting 1 input of polarisation circulator door; And through the light beam that is loaded with current signal to be measured that reflection is returned oppositely enters guarantor's polarisation to learn circulator by door 2 after, be transferred to photo-detector from its 3 outputs by optical fiber transmission line unit and fiber-optic current sensor unit.
4. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor, it is characterized in that: described photovoltaic element can comprise by the optical birefringence phase-modulator, modulation signal generator, the open loop optical phase modulated structure that photo-detector and Signal Data Processor constitute; Also can comprise by feedback control circuit optical birefringence phase-modulator, modulation signal generator, photo-detector and Signal Data Processor and the closed loop optical phase modulated structure that forms.
5. the photovoltaic element in the full fiber reflection formula of the high light intensity benefit type according to claim 2 optical current mutual inductor is characterized in that: described optical birefringence phase-modulator can combine the integrated optical device that forms with electro-optic crystal and constitute with optical fiber and corresponding Light Coupled Device etc.
6. the full fiber reflection formula of high light intensity benefit type according to claim 1 and 2 optical current mutual inductor is characterized in that: described signal data processing unit for being loaded with current signal to be measured and being transferred to the interference light light intensity of photo-detector through what reflection was returned by the fiber-optic current sensor unit
Be converted into electric signal and handle the signal data processing unit of exporting;
Wherein, V is a Verdet constant, and N is the number of turn of sensor fibre circle around current carrying bus, I
dBe the light intensity that photo-detector is accepted, I
sBe the light intensity that light source sends, k is the loss of whole optical path, φ wherein (t)=φ
mCos (ω
mT) be the modulation signal of optical birefringence phase-modulator;
I can utilize following formula to draw by various signal demodulating method analyzing and processing as the electric current to be measured in the high pressure current carrying bus conductor in the formula;
I can be a DC current as the electric current to be measured in the current carrying bus conductor in the formula, also can be alternating current.
7. according to claim 2 or the full fiber reflection formula of 4 described high light intensity benefit types optical current mutual inductor, it is characterized in that: utilize the correlation method demodulation, enough hour of the phasic difference that causes at electric current to be measured, described Signal Data Processor is according to following formula:
V
1∝J
1(φ
m)(4VNI)
The voltage value signal data processor of will be from the electric signal demodulation of photo-detector and utilizing the one order harmonic component to draw to be proportional to current value I to be measured in the current carrying bus conductor;
Wherein, V
1Be the voltage signal that Signal Data Processor provides corresponding to an order harmonic component, J
1(φ
m) be that wherein corresponding argument is φ
mFirst-order bessel function.
8. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor, it is characterized in that: described optical fiber transmission line unit comprises: the polarization maintaining optical fibre optical cable; Built-in polarization maintaining optical fibre section; High-Voltage Insulation structure, preceding two parts form the polarization maintaining optical fibre lag line altogether in light path; The polarization maintaining optical fibre optical cable is transferred to High-Voltage Insulation structure place with the light beam of above-mentioned photovoltaic element output from the observing and controlling chamber at its place; The built-in polarization maintaining optical fibre section that is arranged in the High-Voltage Insulation inside configuration is transferred to the fiber-optic current sensor unit that is positioned at high-voltage region with above-mentioned light beam from low-voltage end; Described built-in polarization maintaining optical fibre section is interconnected to constitute by the optical fiber of the optical cable packaging protection that the structure and material of several sections varying strengths forms.
9. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor, it is characterized in that: described fiber-optic current sensor unit is in the high voltage environment zone, it comprises opticator and encapsulating structure, described opticator is connected to form by following optics light: the optics quarter-wave plate, it can be that full optical fiber constitutes, and also can constitute with micro-optical device; In order to the sensor fibre circle in the magnetic field that electric current to be measured generates of inducting with at the catoptron of this sensor fibre circle end face; The catoptron that lays respectively at the optics quarter-wave plate at sensor fibre circle two ends and sensor fibre circle other end should be tried one's best and closely be placed, thereby makes sensor fibre circle sealing ground around at least one circle of high voltage current carrying bus conductor or whole numbers of turns; Its encapsulating structure is used for supporting lays optics.
10. the full fiber reflection formula of high light intensity benefit type according to claim 1 optical current mutual inductor, it is characterized in that: described complete each cell distribution of fiber reflection formula optical current sensor is set to: photovoltaic element all is placed in the observing and controlling chamber interior, by be in polarization maintaining optical fibre optical cable in the outdoor optical fiber transmission line unit with the beam Propagation of above-mentioned photovoltaic element output to High-Voltage Insulation column structure base, again by built-in polarization maintaining optical fibre section via the optics quarter-wave plate of High-Voltage Insulation column structure internal transmission in the fibre-optic current sensing unit, enter sensor fibre circle and catoptron around current subsequently, the back that is reflected is along the backpropagation of sensor fibre circle; All opticators that are in the high voltage environment all are placed among the encapsulating structure.
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| CNU200720153637XU CN201047858Y (en) | 2007-05-23 | 2007-05-23 | High intensity effect type full optical fiber reflection type optical current mutual inductor |
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| CN101793916A (en) * | 2010-03-31 | 2010-08-04 | 哈尔滨工业大学 | All-fiber current monitoring device based on Faraday effect |
| CN101968508A (en) * | 2010-09-16 | 2011-02-09 | 北京交通大学 | All-fiber current sensor and polarization state control method thereof |
| CN102053199A (en) * | 2009-10-29 | 2011-05-11 | 徐启峰 | Digital optical fiber current sensor |
| CN101661054B (en) * | 2009-09-22 | 2012-05-30 | 国网电力科学研究院 | Optical fiber DC comparator for DC high-voltage transmission |
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| CN101661054B (en) * | 2009-09-22 | 2012-05-30 | 国网电力科学研究院 | Optical fiber DC comparator for DC high-voltage transmission |
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| CN101968508A (en) * | 2010-09-16 | 2011-02-09 | 北京交通大学 | All-fiber current sensor and polarization state control method thereof |
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| CN114325030B (en) * | 2021-09-30 | 2024-05-03 | 南京曦光信息科技研究院有限公司 | Double-square-wave modulation open-loop demodulation method based on optical current transformer |
| WO2024098245A1 (en) * | 2022-11-08 | 2024-05-16 | 北方工业大学 | Current measurement apparatus based on optical fiber ring current sensor |
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