CN102830258B - Optical current sensor-based system and current measuring method - Google Patents
Optical current sensor-based system and current measuring method Download PDFInfo
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Abstract
The invention discloses optical current sensor-based system and current measuring method.This optical current sensor-based system comprises sensing unit, bidirectional transmit-receive unit and data processing unit.Sensing unit is arranged on measured conductor, comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus.Bidirectional transmit-receive unit comprises light source and branching unit, the light that branching unit is used for light source to send is divided into two-way, one road is incident from first collimator, from the second collimating apparatus outgoing, and obtain the first data-signal carrying current information, another road is incident from the second collimating apparatus, from first collimator outgoing, and obtains the second data-signal carrying current information.Data processing unit is used for processing the first data-signal and the second data-signal, to obtain the data characterizing and flow through the electric current of conductor.
Description
Technical field
The present invention relates to optical current sensing technology, particularly a kind of optical current sensor-based system and current measuring method.
Background technology
Current sensor or mutual inductor are for detecting the visual plant of electric current in the fields such as metallurgy, chemical industry, electric power, electrical network.In intelligent grid, need to arrange the eyes of a large amount of current detecting points as intelligent grid.Therefore, many factors and the intelligent grid construction such as the performance of sensor, cost, installation be convenient, run closely related.
At present, the optical fiber current mutual inductor in a large number based on Luo-coil scheme electronic current mutual inductor and Faraday effect has been reported.
The acquisition module of the electronic current mutual inductor of Luo-coil scheme must be placed on high-pressure side or close position, and this is just easily subject to the electromagnetic interference (EMI) in outfield, thus causes mutual inductor malfunctioning.In addition, this current transformer when mounted, needs conductor to disconnect usually.
All-fiber current transformator based on Faraday effect mainly utilizes Ampere circuit law and Faraday magnetooptical effect to measure the electric current of conductor.Program excellent performance, thoroughly can solve the fatal problem that Luo-coil exists.But its technical sophistication, cost is higher, is applicable to high pressure and extra-high voltage application.In addition, this product is encapsulated in closed annular metal structure in advance, must disconnect measured conductor during installation, and application underaction, in mesolow field, application is restricted.
But in intelligent grid construction and old-fashioned Transfomer Substation Reconstruction process, current lead can not disconnect easily.Can find out, existing Luo-coil scheme or the all-fiber current transformator based on Faraday magnetooptical effect, owing to can not carry out portable installation at the scene, and cost is higher, is restricted in the application in Medial & Low Voltage Power Network field.
Summary of the invention
In view of this, the invention provides a kind of portable that can carry out without the need to disconnecting conductor and install and optical current sensor-based system with low cost, and the method accordingly electric current flowing through conductor measured.
According to an aspect of the present invention, provide a kind of optical current sensor-based system, for measuring the electric current flowing through conductor, this system comprises sensing unit, bidirectional transmit-receive unit and data processing unit.Sensing unit is arranged on measured conductor, comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus.Bidirectional transmit-receive unit comprises: light source and branching unit.The light that branching unit is used for light source to send is divided into first via light and the second road light.First via light is incident from the first collimator of sensing unit, the second collimating apparatus outgoing, and obtains the first data-signal carrying current information; Second road light is incident from the second collimating apparatus of sensing unit, first collimator outgoing, and obtains the second data-signal carrying current information.Data processing unit is used for processing the first data-signal and the second data-signal, to obtain the data characterizing and flow through the electric current of conductor.
Preferably, bidirectional transmit-receive unit also comprises the depolarizer for the beam uniformity sent by light source.
In one embodiment, branching unit can comprise the first beam splitter, the second beam splitter, the 3rd beam splitter, the first detector and the second detector, wherein light source sends and light through depolarizer is divided into first via light and the second road light by the first beam splitter, wherein first via light incides the first collimator of sensing unit via the second beam splitter, from the second collimating apparatus outgoing, and the first data-signal carrying current information is input to the first detector via the 3rd beam splitter; Second road light incides the second collimating apparatus of sensing unit via the 3rd beam splitter, from first collimator outgoing, and the second data-signal carrying current information is inputted the second detector via the second beam splitter.
In one embodiment, data processing unit can comprise two AD collectors, collects data-signal respectively from the first data-signal carrying current information; Two the 2nd AD collectors, collect data-signal respectively from the second data-signal carrying current information; And computing unit, from the data-signal that each AD collector collects, extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain characterizing the data of the electric current flowing through conductor.
In one embodiment, computing unit can subtract each other one of to collect in data-signal data that the sign calculated flows through the electric current of conductor from two AD collectors, to eliminate the error that in measurement result, the residual birefringence of magneto-optic memory technique causes with the data flowing through the electric current of conductor from the sign calculated one of the data-signal that two the 2nd AD collectors collect further.
According to a further aspect in the invention, a kind of method utilizing sensing unit to measure the electric current flowing through conductor is provided.This sensing unit is arranged on conductor, and comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus.The method comprises: the light sent by light source is divided into first via light and the second road light; Described first via light is flowed through described sensing unit along first direction, to obtain the first data-signal carrying current information; Described second road light is flowed through described sensing unit along second direction opposite to the first direction, to obtain the second data-signal carrying current information; Calculate based on described first data-signal and described second data-signal, to obtain characterizing the data of the electric current flowing through conductor.
In one embodiment, carry out calculating based on described first data-signal and described second data-signal can comprise: from the first data-signal, extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain the data that the first sign flows through the electric current of conductor; From the second data-signal, extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain the data that the second sign flows through the electric current of conductor.
In one embodiment, data and described second data characterizing the electric current flowing through conductor that further described first sign can also be flowed through the electric current of conductor are subtracted each other, to eliminate the error that in measurement result, the residual birefringence of magneto-optic memory technique causes.
In accordance with a further aspect of the present invention, a kind of optical current sensor-based system is provided.This system comprises: be arranged on the multiple sensing units on measured conductor, and each sensing unit comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus; For the bidirectional transmit-receive unit that each sensing unit is arranged, each bidirectional transmit-receive unit comprises: light source; And branching unit, light for being sent by described light source is divided into first via light and the second road light, first via light is incident from the first collimator of sensing unit, from the second collimating apparatus outgoing of sensing unit, and obtain the first data-signal carrying current information, second road light is incident from the second collimating apparatus of sensing unit, from the first collimator outgoing of sensing unit, and obtains the second data-signal carrying current information; And for the data processing unit that each sensing unit is arranged, for processing the first data-signal and the second data-signal, to obtain the data characterizing and flow through the electric current of conductor.
Preferably, above-mentioned multiple sensing unit is encapsulated in non-metal shell separately, and is evenly fixed around conductor by jig.
Optical current sensor-based system is with low cost according to an embodiment of the invention, and can install easily at the scene when without the need to disconnecting conductor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the optical current sensor-based system according to the embodiment of the present invention.
Fig. 2 is sensing unit according to the embodiment of the present invention and encapsulating structure schematic diagram thereof.
Fig. 3 is the logic connection diagram of signal processing.
Fig. 4 A and Fig. 4 B illustrates the front elevation that single sensing unit is installed and stereographic map respectively.
Fig. 5 A and Fig. 5 B illustrates the front elevation that three sensing units are installed and stereographic map respectively.
Fig. 6 A and Fig. 6 B illustrates the front elevation that four sensing units are installed and stereographic map respectively.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in more detail.
The embodiment of the present invention provides a kind of optical current sensor-based system, for resolving the light signal of two-way symmetry, thus obtains the size of current by conductor, and exports completely independently two groups of measurement data, for back-end system or device.
Referring now to Fig. 1 and Fig. 2, the optical current sensor-based system according to the embodiment of the present invention is specifically described.Wherein, Fig. 1 is the schematic diagram of the optical current sensor-based system according to the embodiment of the present invention, and Fig. 2 is sensing unit according to the embodiment of the present invention and encapsulating structure schematic diagram thereof.
See Fig. 1 and Fig. 2, comprise sensing unit, bidirectional transmit-receive unit and data processing unit according to the optical current sensor-based system of the embodiment of the present invention.
Sensing unit comprises first collimator 41, first polarizer 51, magneto-optical crystal 6, second polarizer 52, second collimating apparatus 42.These parts are arranged according to described order optical alignment.
The crystal with magneto-optic effect that magneto-optical crystal 6 can be made for the quartzy dopant material such as TTG crystal, TB crystal.
First polarizer 51 and the second polarizer 52 are placed on the both sides of magneto-optical crystal 6 respectively, and polarization direction preferably becomes miter angle, maximum to ensure the sensitivity that luminous power changes with deflection angle, and the linearity is best.
First collimator 41 and the second collimating apparatus 42 are placed on the side relative with magneto-optical crystal of the first polarizer 51 and the side relative with magneto-optical crystal of the second polarizer 52 respectively.
All parts in the light path of sensing unit can be consisted of the mode of bonding mode or Space Collimation, to ensure the optical axis of all parts on the same line, thus improves throughput and the stability of light path.Such as, first collimator 41 can be coupled with the first polarizer 51 or bonding, and the second collimating apparatus 42 can be coupled with the second polarizer device 52 or bonding.The light path of sensing unit can be placed on nonmetal base or support, fixes to make each optics.The light path of sensing unit can be enclosed in one with in the non-metal shell of jig, in order to be arranged on measured conductor easily and flexibly.
Sensing unit is close to and is arranged on measured conductor, for sensor conductor flow through electric current produce size and the direction in magnetic field, thus make the light of outgoing carry current information.The face that the shell of sensing unit contacts with measured conductor can concavely, to hold measured conductor tightly more compactly, make measuring accuracy higher.The nonmetallic materials that sheathing material preferred hardness is high, plasticity is good of sensing unit, for solving the problem of insulation and circulation.
Bidirectional transmit-receive unit comprises light source and branching unit.
Light source 1 is for generation of light beam, and this light beam has certain spectrum width, is preferably more than 30nm, to suppress the interference forming remaining interference signal due to the reflection existed in light path.For example, this light source can be light emitting diode (LED) or super-radiance light emitting diode (SLD).
The light that branching unit is used for light source to send is divided into first via light and the second road light, first via light is incident from the first collimator of sensing unit, from the second collimating apparatus outgoing of sensing unit, and obtain the first data-signal carrying current information, second road light is incident from the second collimating apparatus of sensing unit, from the first collimator outgoing of sensing unit, and obtain the second data-signal carrying current information.
Branching unit comprises the first beam splitter 31, second beam splitter 32, the 3rd beam splitter 33, first photodetector 71, second photodetector 72.
First beam splitter 31 can be 2 × 2 beam splitters, and has input end, the first output terminal, the second output terminal and dead end, for the light beam from input end incidence is divided into two bundles.Second beam splitter 32 and the 3rd beam splitter 33 can be 2 × 2 beam splitters, and all there is input end, output terminal, return terminal and nose end, for first collimator 41 or second collimating apparatus 42 of sensing unit will be outputted to from the light beam of input end incidence from output terminal, simultaneously, the light signal returned exports from return terminal after the reverse incidence of output terminal, and enters photodetector 71 or 72.The dead end of first, second, third beam splitter such as can carry out elimination reflection process by immersing the measures such as matching fluid.Here beam splitter also can be described as coupling mechanism.
First photodetector 71 and the second photodetector 72 can coordinate amplifying circuit, the light intensity signal carrying alternating current-direct current are converted into two voltage signal V1 and V2(i.e. the first data-signal and the second data-signal), flow to data processing unit respectively.
Bidirectional transmit-receive unit preferably can comprise depolarizer 2.Depolarizer is used for the polarization randomization of the light beam sent by light source, that is, from the broad band light beam energy even in all directions of depolarizer outgoing, to ensure that light beam has enough little Polarization Dependent Loss in transmitting procedure, and the power fluctuation caused by external interference such as stress when ensureing that light beam transmits in optical cable is minimum.For example, depolarizer 2 can be Loyt Fibre Optic Depolarizer.
Bidirectional transmit-receive unit can be connected by optical cable with between sensing unit.Specifically, the output terminal of the second beam splitter 32 of bidirectional transmit-receive unit is connected by optical cable with the first collimator of sensing unit, and the output terminal of the 3rd beam splitter 32 of bidirectional transmit-receive unit is connected by optical cable with the second collimating apparatus of sensing unit.Here optical cable can be general single mode fiber.
Data processing unit is used for the first data-signal V1 and the second data-signal V2 process, to obtain the data characterizing and flow through the electric current of conductor.Data processing unit comprises four AD collectors 81,82,83,84 and computing unit 9.For example, computing unit can be field programmable gate array (FPGA) or digital signal processor (DSP) etc.
The detailed process below in conjunction with attached Fig. 1 and 2, the sensing unit utilizing measured conductor to arrange being measured to the electric current of conductor is described in detail.
The light that light source 1 sends enters depolarizer 2, obtains the light beam of all directions energy even.Entered the input end of the first beam splitter 31 by the light beam of depolarizer outgoing, light is divided into two bundles by the first beam splitter 31, two such as impartial bundles.The travel path of this two-beam will be described respectively below.
The input end of the second beam splitter 32 is entered from the light of the first output terminal outgoing of the first beam splitter 31.Entered the first collimator 41 of sensing unit by optical cable from the light of the output terminal outgoing of the second beam splitter 32.The light collimated through first collimator 41 is converted to linearly polarized light via the first polarizer 51, and enters magneto-optical crystal 6.Under the magnetic fields that electric current produces, in magneto-optical crystal 6, the linearly polarized light of transmission can deflect, deflection angle θ
1=VLB=K
1i, wherein, V is Verdet constant, and L is the length of magneto-optical crystal, and L can choose the length suitable with conductor diameter, and B is magnetic field intensity, and K is scale factor.Therefore, carry current information from the polarized light of magneto-optical crystal 6 outgoing, and enter the second optical polarizator 52.Because the second polarizer 52 becomes miter angle with the polarization direction of the first polarizer 51, therefore luminous power transport function is P=P
0sin (45 ° of+θ
1).Due to θ
1very little, therefore luminous power transport function can be write as
the polarization angle information utilizing the second polarizer 52 electric current or magnetic field to be caused is converted to optical power change information.After the second collimating apparatus 42, enter the output terminal of the second beam splitter 33 from the light beam of the second polarizer 52 outgoing, and export at the return terminal of the second beam splitter 33, enter the first photodetector 71.First photodetector 71 coordinates with amplifying circuit (not shown), and the light intensity signal carrying alternating current-direct current information is converted to voltage signal V1.Here, light intensity signal and voltage signal have linear corresponding relation.
Entering the input end of the 3rd beam splitter 33 from the light of the second output terminal outgoing of the first beam splitter 31, entering the second collimating apparatus 42 of sensing unit 6 from the light of the output terminal outgoing of the 3rd beam splitter 33 by connecting optical cable.Light through the second collimating device collimation is converted to linearly polarized light by the second polarizer 52, and enters magneto-optical crystal 6.Under the magnetic fields that electric current produces, in magneto-optical crystal 6, the linearly polarized light of transmission can deflect, deflection angle θ
2=VLB=-K
2i, here, θ
2with θ
1symbol is contrary.Carry current information from the polarized light of magneto-optical crystal 6 outgoing, and enter the first optical polarizator 51.When the first optical polarizator 51 differs 45 ° with the polarization direction of the second optical polarizator 52, its transport function is P=P
0sin (45 ° of+θ
2), due to θ
2very little, therefore transport function can be write as
the polarization angle information utilizing the first polarizer 51 electric current or magnetic field to be caused is converted to optical power change information.After first collimator 41, enter the output terminal of the second beam splitter 32 from the light beam of the first polarizer 51 outgoing, and export at the return terminal of the second beam splitter 32, enter the second photodetector 72.Second photodetector 72 coordinates with amplifying circuit, and the light intensity signal carrying alternating current-direct current information that the second photodetector 72 detects is converted to voltage signal V2.
Visible, optical current sensor-based system according to the above embodiment of the present invention provides the incoherent data of two-way, can for rear end equipment, the application such as such as protection dual configuration design.
The data processing according to the embodiment of the present invention is specifically described below with reference to accompanying drawing 3.
Fig. 3 is the logic connection diagram of signal processing.Data processing unit passes through AD collector AD11 and AD12 from voltage signal V1 image data, by AD collector AD21 and AD22 from voltage signal V2 image data.The data that each AD collector collects are all containing direct current and AC compounent.DC component is relevant with through-put power, light path and circuit gain.AC compounent is except by except the impact of faraday's deflection angle, also relevant with through-put power, light path and circuit gain.The drift of through-put power, light path and circuit gain is unavoidable.In order to eliminate the measuring error that this drift is introduced, according to an example of the present invention, computing unit extracts DC component and AC compounent from each collector, thus obtains AC11, DC11, AC12, DC12, AC21, DC21, AC22, DC22.Data δ corresponding to faraday's deflection angle is obtained by digital algorithm
1=D11=AC11/DC11, wherein δ
1be digital quantity corresponding to Faraday rotation angle, AC11 is the AC compounent that computing unit extracts, and DC11 is the DC component that computing unit extracts.In like manner, δ can be obtained
1'=D12=AC12/DC12, δ
2=D21=AC21/DC21, δ
2'=D22=AC22/DC22.
For magneto-optic memory technique, the anglec of rotation of the polarized light of transmission is changed by magnetic field, also can be subject to the change of magneto-optic memory technique residual birefringence in addition, but the latter is slowly.Pass between the data that the faraday's deflection angle obtained is corresponding and the deflection angle that reality is caused by magneto-optical crystal is: δ
1=(θ
1+ ε), δ
2=θ
2+ ε, wherein, ε is magneto-optic memory technique residual birefringence error.Due to θ
2with θ
1symbol is contrary, therefore, the two is subtracted each other and can obtain δ=δ
1-δ
2=θ
1-θ
2=(K
1+ K
2) I.That is, the error that magneto-optic memory technique residual birefringence causes can be eliminated by these two data being subtracted each other.Similarly, δ ＇=(K ＇ can be obtained
1+ K
2＇) I.
Stable and accurate measuring-signal can either be obtained according to the signal processing system of the embodiment of the present invention and algorithm, meet again the dual required by intelligent substation design, criterion that Double Data exports.
In the above-described embodiments, employ a sensing unit, this sensing unit is close to by jig is fixed to measured conductor, as shown in Figure 4 A and 4 B shown in FIG..
In other embodiments, around measured conductor, multiple sensing unit can be fixed by decile, in order to eliminate the interference closing on electric current or magnetic field, thus higher accuracy of measurement can be reached.Such as, around measured conductor, three sensing units can be fixed by decile, as fig. 5 a and fig. 5b.Again such as, around measured conductor, four sensing units can be fixed by decile, as shown in Figure 6 A and 6 B.
Suppose that symmetry is close to installation n sensing unit around measured conductor, for the current value that each sensing unit has a set of above current sensing system described in conjunction with Figure 1 to obtain, average computation can be weighted, namely to the data that each sensing unit obtains
thus effectively reduce the interference closing on magnetic field and electric current, obtain measurement result more accurately.Here n is preferably 1 ~ 4.If n is excessive, be unfavorable for installing, and cost can sharply increase.
According to embodiments of the invention, have employed the sensing unit with magneto-optical crystal, sensing unit is close to and is fixed on measured conductor, is connected with bidirectional transmit-receive unit by two optical cables.Bidirectional transmit-receive unit and data processing unit can be placed on distance conductor place far away.Current value accurately can be obtained by detecting the light signal that returns and completing calculating.Therefore this optical current sensor-based system is measured accurate, with low cost, and can install easily at the scene when without the need to disconnecting conductor, go for such as Medial & Low Voltage Power Network field, the cited field such as switch cubicle, middle voltage bus bar of such as network system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. an optical current sensor-based system, for measuring the electric current flowing through conductor, this system comprises:
Sensing unit, is arranged on conductor, comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus;
Bidirectional transmit-receive unit, comprising:
Light source; With
Branching unit, light for being sent by described light source is divided into first via light and the second road light, described first via light is incident from the first collimator of described sensing unit, from the second collimating apparatus outgoing of described sensing unit, and obtain the first data-signal carrying current information, described second road light is incident from the second collimating apparatus of described sensing unit, from the first collimator outgoing of described sensing unit, and obtains the second data-signal carrying current information; And
Data processing unit, for processing the first data-signal and the second data-signal, to obtain the data characterizing and flow through the electric current of conductor;
Described data processing unit comprises: two AD collectors, collect data-signal respectively from the first data-signal carrying current information; Two the 2nd AD collectors, collect data-signal respectively from the second data-signal carrying current information; And computing unit, from the data-signal that each AD collector collects, extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain the data that four tunnels independently characterize the electric current flowing through conductor.
2. optical current sensor-based system according to claim 1, wherein said bidirectional transmit-receive unit also comprises the depolarizer for the beam uniformity sent by described light source.
3. optical current sensor-based system according to claim 2, wherein said branching unit comprises the first beam splitter, the second beam splitter, the 3rd beam splitter, the first detector and the second detector,
Described light source sends by wherein said first beam splitter and light through described depolarizer is divided into described first via light and described second road light, wherein said first via light incides the first collimator of described sensing unit via described second beam splitter, from described second collimating apparatus outgoing, and the first data-signal carrying current information is input to described first detector via described 3rd beam splitter; Described second road light incides the second collimating apparatus of described sensing unit via described 3rd beam splitter, from described first collimator outgoing, and the second data-signal carrying current information is input to described second detector via described second beam splitter.
4. according to the optical current sensor-based system one of claims 1 to 3 Suo Shu, wherein said computing unit subtracts each other one of to collect in data-signal data that the sign calculated flows through the electric current of conductor from described two AD collectors, to eliminate the error that in measurement result, the residual birefringence of magneto-optic memory technique causes with the data flowing through the electric current of conductor from the sign calculated one of the data-signal that described two the 2nd AD collectors collect further; Described computing unit realizes two-way data and exports.
5. the method utilizing sensing unit to measure the electric current flowing through conductor, described sensing unit is arranged on conductor, and comprise order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus, described method comprises:
The light sent by light source is divided into first via light and the second road light;
Described first via light is flowed through described sensing unit along first direction, to obtain the first data-signal carrying current information;
Described second road light is flowed through described sensing unit along second direction opposite to the first direction, to obtain the second data-signal carrying current information;
Two AD collectors are adopted from the first data-signal carrying current information, to collect data-signal respectively, two the 2nd AD collectors are adopted from the second data-signal carrying current information, to collect data-signal respectively, calculate based on two-way first data-signal and two-way second data-signal, to obtain the data that four tunnels independently characterize the electric current flowing through conductor.
6. method according to claim 5, wherein carry out calculating based on described first data-signal and described second data-signal and comprise:
From described two-way first data-signal, all extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain two-way first and characterize the data flowing through the electric current of conductor;
From described two-way second data-signal, all extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain two-way second and characterize the data flowing through the electric current of conductor.
7. method according to claim 6, comprises further:
Characterize the data flowing through the electric current of conductor to subtract each other described first with the described second data characterizing the electric current flowing through conductor, to eliminate error that in measurement result, the residual birefringence of magneto-optic memory technique causes and to realize the output of two-way data.
8. an optical current sensor-based system, comprising:
Be arranged on the multiple sensing units on conductor, each sensing unit comprises order arrangement and the first collimator of optical alignment, the first polarizer, magneto-optical crystal, the second polarizer, the second collimating apparatus;
For the bidirectional transmit-receive unit that each sensing unit is arranged, each bidirectional transmit-receive unit comprises:
Light source; With
Branching unit, light for being sent by described light source is divided into first via light and the second road light, described first via light is incident from the first collimator of described sensing unit, from the second collimating apparatus outgoing of described sensing unit, and obtain the first data-signal carrying current information, described second road light is incident from the second collimating apparatus of described sensing unit, from the first collimator outgoing of described sensing unit, and obtains the second data-signal carrying current information; And
For the data processing unit that each sensing unit is arranged, for processing the first data-signal and the second data-signal, to obtain the data characterizing and flow through the electric current of conductor;
Described data processing unit comprises: two AD collectors, collect data-signal respectively from the first data-signal carrying current information; Two the 2nd AD collectors, collect data-signal respectively from the second data-signal carrying current information; And computing unit, from the data-signal that each AD collector collects, extract DC component and AC compounent, and AC compounent and DC component are divided by, obtain the data that four tunnels independently characterize the electric current flowing through conductor.
9. optical current sensor-based system according to claim 8, wherein said multiple sensing unit is encapsulated in non-metal shell separately, and is evenly fixed around conductor by jig.
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| JP3488576B2 (en) * | 1996-08-30 | 2004-01-19 | 株式会社東芝 | Optical current transformer |
| CN100340860C (en) * | 2005-06-13 | 2007-10-03 | 北京航空航天大学 | Optical fibre current transformer and its loop detector of transformer |
| CN101408558B (en) * | 2008-09-10 | 2011-07-06 | 湾世伟 | Minitype optical DC/AC electric field sensor |
| CN101846703B (en) * | 2009-03-23 | 2014-10-15 | 福州大学 | Digital optical fiber current sensor |
| CN201489997U (en) * | 2009-09-04 | 2010-05-26 | 北京齐瑞得电力技术有限公司 | Optical fiber current transformer |
| CN201498352U (en) * | 2009-09-08 | 2010-06-02 | 山东电力集团公司潍坊供电公司 | All-fiber current transformer |
| CN202305631U (en) * | 2011-11-04 | 2012-07-04 | 深圳市众望达光电有限公司 | Optical-fiber-type current transformer |
| CN102565496A (en) * | 2011-11-23 | 2012-07-11 | 哈尔滨工业大学 | Two-way transmission optical current sensor |
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| CN110763897A (en) * | 2019-10-16 | 2020-02-07 | 中国矿业大学 | Coal mine optical fiber current sensor for eliminating light source power fluctuation on line and control method |
| CN110763897B (en) * | 2019-10-16 | 2020-07-14 | 中国矿业大学 | Coal mine optical fiber current sensor for eliminating light source power fluctuation on line and control method |
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