CN106324323B - A kind of all-fiber current transformator and its current measuring method - Google Patents
A kind of all-fiber current transformator and its current measuring method Download PDFInfo
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- CN106324323B CN106324323B CN201610784671.0A CN201610784671A CN106324323B CN 106324323 B CN106324323 B CN 106324323B CN 201610784671 A CN201610784671 A CN 201610784671A CN 106324323 B CN106324323 B CN 106324323B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
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Abstract
The present invention provides a kind of all-fiber current transformator and its current measuring methods, it is mainly made of sensing unit, signal processing unit and combining unit three parts.The sensing unit uses Faraday magnetooptical effect principle, for incuding the electric current of measured conductor, and generates the data information that light intensity signal carries Faraday angle of rotation.The signal processing unit mainly completes the input to sensing unit optical signal, the parsing of output optical signal, digitized processing, temperature-compensating etc., and is exported according to the synchronous serial mode of regulation.The combining unit completes synchronization to signal processing unit information, switching or simultaneously row logic, and is transferred to electric testing instrument and relay protection device.
Description
[technical field]
The present invention relates to a kind of all-fiber current transformators based on Faraday magnetooptical effect principle.It is suitable for GIS's
Electrical energy measurement, relay protection and electric quantity monitoring.
[background technique]
Current transformer carries the metering effect of electric current in electric system.It is traditional as the important component of GIS
Electromagnetic current transducer is since its is bulky, at high cost, dynamic range is small, be also easy to produce ferromagnetic resonance, analog output etc.
Unfavorable factor, have been unable to meet smart grid to current transformer low cost, small in size, the linearity is good, digital output, safety
It is reliable to require.Active electric mutual inductor is applied increasingly reliably in the switch of 126~252kV voltage class, although it has
There is small in size, digital output, without the advantages such as magnetic is full, but due to the limitation of its structure and principle, in higher voltage grade
Reliability substantially reduces, and influences the reliability service of smart grid.
[summary of the invention]
The present invention provides a kind of all-fiber current transformator and its current measuring method, effect solves conventional electromagnetic mutual inductance
Body product is big, dynamic range is small, be also easy to produce ferromagnetic resonance, open circuit generates the unfavorable factors such as high pressure, analog output, solves simultaneously
The drawbacks such as active electronic transformer anti-interference is poor, structure is complicated, stability difference.Meet smart grid to current transformer
Low energy consumption, high accuracy, safe and reliable requirement.
To achieve the above object, the invention adopts the following technical scheme:
A kind of all-fiber current transformator based on Faraday magnetooptical effect principle, including sensing unit, signal processing list
Member and combining unit, the combining unit are connect with electric testing instrument and relay protection device, and the sensing unit includes
The sensor fibre of end to end close ring is turned to, welding has reflecting mirror and conversion light to the head and the tail of the sensor fibre respectively
Fibre is provided with light source in the signal processing unit, and after the light which issues is divided into two-beam, converted optical fiber is converted to
The opposite two-beam in direction of rotation is reflected by a reflector after transmitting in sensor fibre.
The upconversion fiber is helical structure birefringence fiber, is divided into incremental double helix section and uniform double helix section.
The reflecting mirror welding is in 45 ° of angles in the end of sensor fibre, the section with sensor fibre.
The sensor fibre is mounted in the U-lag of annular flange, the tangent line of the reflecting mirror and upconversion fiber in U-type groove
Direction is parallel to each other.
The reflecting mirror and upconversion fiber are close to arrange along the normal direction of ring structure.
The upconversion fiber other end is electrically connected by polarization maintaining optical fibre with signal processing unit.
The annular flange is metal material, and the ring-like cover board of top covering insulating material has blocked annular flange
Induced current.
Coiling circle number of the sensor fibre in protection ring body is according to size, the transformer request for being tested electric current
Precision and ring body size determine.
The signal processing unit includes light path module, circuit module, power module and guard shield, the light path module
For emitting, reception and measurement optical signal, export the phase difference of two-beam, the circuit module is used to parse the phase of two-beam
Difference, and with this calculating current, and result is exported with digital signal.
The light path module include emit light source laser emitter, to light source issue light coupled coupler,
Light source is divided into two bundles to the polarizer of linearly polarized photon, the modulator connecting with the polarizer carries out interferometry to two-beam
Ray detector.
The circuit module includes sequentially connected signal processing and numeral output, wherein the input terminal of signal processing into
One step is connected with temperature-compensating, and eliminating temperature influences measured deviation.
The numeral output exports measurement structure to combining unit according to synchronous serial mode.
The guard shield, is made of ferromagnetic, to being put into light path module therein, circuit module, power module
With corresponding anti-electromagnetic shielding, waterproof, moisture-proof function, while there are installation and data outputs, input interface.
A kind of current measuring method of all-fiber current transformator, the continuous light that light source issues are divided into two beam polarization directions
The two beams vertical linear polarisation light after upconversion fiber receives the light, is converted into left-handed and right-handed elliptical by orthogonal light
Polarised light, by circumferentially propagating in sensor fibre, which is reflected by a reflector, while two beam elliptically polarized lights
Direction of rotation also reversed；Two-way reflects light back at upconversion fiber, is converted into the mutually perpendicular linearly polarized photon of two-way
Beam finally reverts to the mutually perpendicular polarised light of two-way, after which is transmitted back to signal processing unit, signal processing unit evidence
Electric current is calculated in this.
The signal processing unit obtains phase difference according to the phase difference calculating of the two-beam of return.
Compared with prior art, the present invention at least has the advantages that all-fiber current transformator low energy consumption, cost
It is low, measurement is accurate, performance is stable, safe and reliable, is easily installed maintenance, avoid electromagnetic transformer energy consumption height, be easy to produce
Open circuit and explosion danger deficiency, while eliminate electronic mutual inductor stablize difference, vulnerable to the interference of electromagnetic field the shortcomings that.
[Detailed description of the invention]
Fig. 1 shows the structure chart of sensing unit in the present invention.
Fig. 2 shows sensing unit A-A structure charts in the present invention.
Fig. 3 show the system diagram of all-fiber current transformator in the present invention.
In figure: 1, ring-like cover board；2, ring-like flange；3, sensor fibre；4, upconversion fiber；5, reflecting mirror；6, polarization maintaining optical fibre.
[specific embodiment]
With reference to the accompanying drawing and specific example invention is further described in detail.
A kind of all-fiber current transformator based on Faraday magnetooptical effect principle, it is mainly by sensing unit, signal
Manage unit and combining unit three parts composition.The sensing unit uses Faraday magnetooptical effect principle, for incuding tested lead
The electric current of body, and generate light intensity signal and carry the data information of Faraday angle of rotation.The signal processing unit is mainly completed
To the input of sensing unit optical signal, the parsing of output optical signal, digitized processing, temperature-compensating etc., and according to the same of regulation
Step serial mode is exported.The combining unit completes synchronization and simultaneously row logic to signal processing unit information, and transmits
To electric testing instrument and relay protection device.
The structure chart that Fig. 1,2 show sensing unit in the present invention, the sensing unit are circular ring type structure, mainly by
Ring-like cover board 1, ring-like flange 2, sensor fibre 3, upconversion fiber 4, reflecting mirror 5 and polarization maintaining optical fibre 6 form, according to tested specified
The U-type groove size of electric current, dynamic current, measurement accuracy and ring-like flange 2, calculates the length of sensor fibre 3, in sense light
One end welding reflecting mirror 5 of fibre 3, makes the section angle at 45 ° of reflecting mirror 5 Yu optical fiber.The other end and conversion light of sensor fibre 3
Fine 4 weldings, make the fibre core of two optical fiber to just.Simultaneously by the other end of upconversion fiber 4 and 6 welding of polarization maintaining optical fibre, when welding, makes
The fibre core of the two is to just.After the completion of welding, is turned to end to end close ring and be fixed on ring-like flange U-type groove
In, and so that reflecting mirror 5 and upconversion fiber 3 is parallel to each other in the tangential direction of U-type groove, and be close to along the tangential direction of ring structure
Arrangement, polarization maintaining optical fibre 6 is drawn as the exit of sensing unit from the outlet of ring-like flange 2, with subsequent data processing unit
Connection.
The upconversion fiber is helical structure birefringence fiber, is divided into incremental double helix section and uniform double helix section, will
Linearly polarized photon is converted to elliptically polarized light；The annular flange is metal material, and centre offers U-type groove, sensor fibre, anti-
Penetrate mirror, the annulus of upconversion fiber coiling is fixed in U-type groove, the annular cover plate be insulating materials, play to shell induced electricity
Stream plays the role of blocking, plays a protective role after the two cooperation to being placed on optical device therein.
Fig. 3 show the system diagram of all-fiber current transformator in the present invention, and whole system is divided by function 3 parts, point
It is not sensing unit, signal processing unit, combining unit.Sensing unit uses Faraday magnetooptical effect principle, for incuding quilt
The electric current of conductor is surveyed, and generates the data information that light intensity signal carries Faraday angle of rotation.Signal processing unit is mainly completed pair
The input of sensing unit optical signal, the parsing of output optical signal, digitized processing etc., and according to the synchronous serial mode of regulation into
Row output.Combining unit is completed to the synchronization of signal processing unit information, switching or simultaneously row logic, and is transferred to electric measurement instrument
Device and relay protection device.
The signal processing unit is mainly made of light path module, circuit module, power module and guard shield.Optical path
Module completes transmitting, reception, measurement and the output of optical signal, circuit module receiving light path module data information, and is converted
It is exported at digital signal.
The light path module, mainly by the optical devices group such as laser emitter, coupler, polarizer, photodetector
At emitting two beam linearly polarized photons to sensing unit, while to reflected two beams linearly polarized photon, interfered using Sagnac
Principle measures the phase difference of two beam polarised lights.
The circuit module, it is corresponding to go out to be tested electric current by the parsing to phase difference, measurement result is gone here and there according to synchronous
Line mode is exported to combining unit.
The power module is the power supply that will be externally supplied, the magnitude of current needed for being converted into each electronic component or electricity
Pressure amount.
The guard shield, is made of ferromagnetic, to being put into light path module therein, circuit module, power module
With corresponding anti-electromagnetic shielding, waterproof, moisture-proof function, while there are installation and data outputs, input interface.
In Fig. 3, the realization process that all-fiber current transformator measures electric current is as follows: the light source in data processing unit exists
Under working condition, the continuous light of sending is polarized after coupler by the polarizer as two beam linearly polarized photons, modulated device completion
Phase-modulation is simultaneously divided into the two orthogonal light in beam polarization direction, exports by polarization maintaining optical fibre；In the sensor fibre of sensing unit
Two beam vertical linear polarisation light are converted into left-handed and right-handed elliptical polarization light by front end, upconversion fiber, and elliptically polarized light is sensing
It is circumferentially propagated in optical fiber；After two-way polarised light has turned several circles around conductor, there is a reflecting mirror in the terminal of sensor fibre, it is right
Two-beam is reflected, while the direction of rotation of two beam elliptically polarized lights is also reversed；Two-way light returns at upconversion fiber, conversion
They are switched to the mutually perpendicular linear polarized beam of two-way again by optical fiber, pass polarizer back by polarization maintaining optical fibre, it is mutual to revert to two-way
Coherent superposition occurs at ray detector for perpendicular polarised light, two-beam wave.
When no current in conductor, the relative propagation velocity of two-beam is identical, does not have when coherent superposition at photodetector
There is phase difference；When there is electric current in conductor, electromagnetic field can be generated around electrical conductor, under the action of electromagnetic field, around
Two beam elliptical polarization light waves of current-carrying conductor, due to faraday's magnetic rotation effect principle, the electromagnetic field that current-carrying conductor is formed makes
Elliptical polarization optical retardation all the way, another way elliptical polarization acceleration by light, the reflecting mirror of sensor fibre terminal reflect two ways of optical signals
It goes back, due to reversing the effect of acceleration, deceleration for making two beam elliptically polarized lights to be doubled, the spread speed of two-beam at this time
Opposite variation occurs, that is, phase difference occurs.
The phase difference of two ways of optical signals and tested electric current have stringent corresponding relationship, by the phase difference pair for measuring two-beam
It should go out to be tested the size of electric current, and use digital output to combining unit metrical information, combining unit is to data processing list
The digital information of member carries out digital quantity conversion according to IEC61850-9-2LE specification, exports to relay protection system and electric current
Measuring instrument.
In practical application, sensing unit is phase structure, every phase is separately mounted to the outside of tested electric current, data processing
Unit and sensing unit correspond, and are placed on the spot or in intelligent cabinet, and combining unit is three-phase common type, are placed on intelligent control
Cabinet processed or protection are indoor.
The above content is combining, specific preferred embodiment is made for the present invention to be described in detail the reality, and it cannot be said that of the invention
The mode of applying is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, all Spirit Essences according to the present invention
Made any simple modification and equivalent structure transformation or modification, belong to the special of claims determination that the present invention is submitted
Sharp protection scope.
Claims (8)
1. one kind is based on Faraday magnetooptical effect principle all-fiber current transformator, it is characterised in that: including sensing unit, signal
Processing unit and combining unit, the combining unit are connect with electric testing instrument and relay protection device, and the sensing is single
Member includes the sensor fibre (3) for turning to end to end close ring, and the head and the tail of the sensor fibre are separately installed with reflecting mirror
(5) and upconversion fiber (4) it, is provided with light source in the signal processing unit, after the light which issues is divided into two-beam, warp
Upconversion fiber is converted to the opposite two-beam in direction of rotation, after transmitting in sensor fibre, is reflected by a reflector；
The upconversion fiber (4) is helical structure birefringence fiber；
The signal processing unit includes light path module, circuit module, power module, and the light path module is for emitting, receiving
With measurement optical signal, the phase difference of two-beam is exported, the circuit module is used to parse the phase difference of two-beam, and calculates with this
Electric current, and result is exported with digital signal；
The light path module includes the laser emitter for emitting light source, the coupler coupled to the light that light source issues, by light
Source is divided into two bundles the polarizer of linearly polarized photon, the modulator connecting with the polarizer, and the light source of interferometry is carried out to two-beam
Detector.
2. a kind of all-fiber current transformator according to claim 1, it is characterised in that: affiliated upconversion fiber includes being incremented by
Double helix section and uniform double helix section.
3. a kind of all-fiber current transformator according to claim 1, it is characterised in that: the reflecting mirror (5) and sensing
The section of optical fiber (3) is in 45 ° of angles.
4. a kind of all-fiber current transformator according to claim 1, it is characterised in that: the sensor fibre is mounted on ring
In the U-lag of shape flange, the reflecting mirror (5) and upconversion fiber (4) are parallel to each other in the tangential direction of U-type groove.
5. a kind of all-fiber current transformator according to claim 1, it is characterised in that: the reflecting mirror (5) and conversion
Optical fiber (4) is close to arrangement along the normal direction of ring structure.
6. a kind of all-fiber current transformator according to claim 4, it is characterised in that: the annular flange (2) is
Metal material, the ring-like cover board (1) of top covering insulating material, has blocked the induced current of annular flange.
7. a kind of all-fiber current transformator according to claim 1, it is characterised in that: the signal processing unit also wraps
Include guard shield；The guard shield, is made of ferromagnetic, to being put into light path module therein, circuit module, power supply mould
Block has corresponding anti-electromagnetic shielding, waterproof, moisture-proof function, while there are installation and data outputs, input interface.
8. a kind of current measuring method based on all-fiber current transformator described in claim 1, it is characterised in that: at data
The light of the light source sending in unit is managed after coupler, is polarized as two beam linearly polarized photons, modulated device completion phase-modulation
And it is divided into the two orthogonal light in beam polarization direction, it is exported by polarization maintaining optical fibre；Upconversion fiber is by two beam vertical linear polarisation light
It is converted into left-handed and right-handed elliptical polarization light, elliptically polarized light is circumferentially propagated in sensor fibre；Two-way polarised light is around leading
After body has turned several circles, there is a reflecting mirror in the terminal of sensor fibre, two-beam is reflected, while two beam elliptically polarized lights
Direction of rotation also reversed；Two-way light returns at upconversion fiber, they are switched to the mutually perpendicular line of two-way again by upconversion fiber
Property light beam, polarizer is passed back by polarization maintaining optical fibre, reverts to the mutually perpendicular polarised light of two-way, two-beam wave is detected in light source
Coherent superposition occurs at device；
When no current in conductor, the relative propagation velocity of two-beam is identical, does not have phase when coherent superposition at photodetector
Potential difference；When there is electric current in conductor, the appearance phase difference of two-beam；The phase difference of two ways of optical signals and tested electric current have stringent
Corresponding relationship, the size of the corresponding electric current tested out of phase difference by measuring two-beam.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841740A (en) * | 2017-01-24 | 2017-06-13 | 国网辽宁省电力有限公司盘锦供电公司 | A kind of anti-interference type all-fiber current transformator |
| CN107132862A (en) * | 2017-05-18 | 2017-09-05 | 国网辽宁省电力有限公司盘锦供电公司 | All-fiber current transformator secondary acquisition device thermostatic control system |
| CN107144718B (en) * | 2017-06-15 | 2023-09-15 | 华北电力大学 | Double-magnetic-circuit composite optical current transformer and signal processing method thereof |
| CN110988435B (en) * | 2019-11-29 | 2023-01-17 | 中国人民解放军92942部队 | Optical path system for improving signal-to-noise ratio of optical fiber current sensor |
| CN112034229A (en) * | 2020-09-08 | 2020-12-04 | 东南大学 | All-fiber voltage transformer |
| CN115453178A (en) * | 2022-08-09 | 2022-12-09 | 北京世维通光智能科技有限公司 | Aluminum electrolytic cell cathode current measuring device and method |
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| CN104635010A (en) * | 2015-02-06 | 2015-05-20 | 宁波永耀信息科技有限公司 | All-fiber optical current transformer detection system |
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| JP3685906B2 (en) * | 1997-05-21 | 2005-08-24 | 東京電力株式会社 | Current measurement method |
| JP3308897B2 (en) * | 1998-05-01 | 2002-07-29 | 株式会社日立製作所 | Current measuring method and photocurrent sensor |
| JP2001281272A (en) * | 2000-03-31 | 2001-10-10 | Toshiba Corp | Current/magnetic field measuring apparatus |
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| CN1213305C (en) * | 2000-07-10 | 2005-08-03 | Abb研究有限公司 | Fiber-optic current sensor |
| CN104635010A (en) * | 2015-02-06 | 2015-05-20 | 宁波永耀信息科技有限公司 | All-fiber optical current transformer detection system |
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