CN106324323A - All-optical-fiber current transformer and current measuring method thereof - Google Patents
All-optical-fiber current transformer and current measuring method thereof Download PDFInfo
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- CN106324323A CN106324323A CN201610784671.0A CN201610784671A CN106324323A CN 106324323 A CN106324323 A CN 106324323A CN 201610784671 A CN201610784671 A CN 201610784671A CN 106324323 A CN106324323 A CN 106324323A
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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
-
- 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
Abstract
The invention provides an all-optical-fiber current transformer and a current measuring method thereof. The all-optical-fiber current transformer is mainly formed by three parts: a sensing unit, a signal processing unit, and a merging unit. The sensing unit employs the Faraday magneto-optic effect principle and used for inducing current of a measured conductor, and generating light intensity signals carrying data information of the Faraday rotation angle. The signal processing unit mainly completes input of optical singles of the sensing unit, analysis of the output optical signals, digitalization processing, and temperature compensation etc., and performs output according to a prescribed synchronous serial mode. The merging unit completes synchronization, switching or parallel logic of information of the signal processing unit, and transmits the information to an electrical measuring instrument and a relay protection device.
Description
[technical field]
The present invention relates to a kind of all-fiber current transformator based on Faraday magnetooptical effect principle.It is applicable to GIS's
Electric energy metrical, relay protection and electric quantity monitoring.
[background technology]
Current transformer carries the metering effect of electric current in power system.As the important component part of GIS, traditional
Electromagnetic current transducer is owing to it is bulky, cost is high, dynamic range is little, be easily generated ferromagnetic resonance, analog output etc.
Unfavorable factor, can not meet intelligent grid to current transformer low cost, volume is little, the linearity good, digital output, safety
Requirement reliably.Active electric mutual inductor is applied the most reliable in the switch of 126～252kV electric pressures, although its tool
Have that volume is little, digital output, without advantages such as magnetic are full, but due to its structure and the restriction of principle, in higher voltage grade
Reliability is substantially reduced, and affects the reliability service of intelligent grid.
[summary of the invention]
The invention provides a kind of all-fiber current transformator and current measuring method thereof, effect solves conventional electromagnetic mutual inductance
Body is long-pending greatly, dynamic range is little, be easily generated ferromagnetic resonance, open circuit produces the unfavorable factor such as high pressure, analog output, solves simultaneously
The drawbacks such as active electronic transformer anti-interference poor, structure complexity, poor stability.Meet intelligent grid to current transformer
Low energy consumption, high accuracy, safe and reliable requirement.
For achieving the above object, the present invention is by the following technical solutions:
A kind of all-fiber current transformator based on Faraday magnetooptical effect principle, including sensing unit, signal processing list
Unit, and combining unit, described combining unit is connected with electric testing instrument and relay protection device, and described sensing unit includes
Turning to the sensor fibre of end to end close ring, the welding respectively of the head and the tail of this sensor fibre has reflecting mirror and conversion light
Fibre, is provided with light source in described signal processing unit, and after the light that this light source sends is divided into two-beam, converted optical fiber is converted to
The two-beam that direction of rotation is contrary, through, after transmission in sensor fibre, being reflected by a reflector.
Described upconversion fiber is helical structure birefringence fiber, is divided into incremental Double helix section and uniform Double helix section.
Described reflecting mirror welding, at the end of sensor fibre, is 45 ° of angles with the cross section of sensor fibre.
Described sensor fibre is arranged in the U-lag of annular flange, and described reflecting mirror and upconversion fiber are at the tangent line of U-type groove
Direction is parallel to each other.
The normal direction of described reflecting mirror and upconversion fiber annularly structure is close to arrange.
The described upconversion fiber other end is electrically connected with signal processing unit by polarization maintaining optical fibre.
Described annular flange is metal material, the ring-like cover plate of top covering insulating material, has blocked annular flange
Faradic current.
The described sensor fibre coiling number of turns in protection ring body, is the size according to tested electric current, transformer request
Precision and ring body size determine.
Described signal processing unit includes light path module, circuit module, power module and guard shield, described light path module
For launching, receive and measure optical signal, the phase contrast of output two-beam, described circuit module is for resolving the phase place of two-beam
Difference, and with this calculating current, and result is exported with digital signal.
Bonder that described light path module includes launching the generating laser of light source, the light that sends light source couples,
Light source is divided into the polarizer of two bundle linearly polarized photons, the manipulator being connected with the polarizer, two-beam is carried out interferometry
Ray detector.
Described circuit module includes signal processing and the numeral output being sequentially connected with, and wherein, the input of signal processing enters
One step connects temperature-compensating, and eliminating temperature affects measured deviation.
Measurement structure is exported to combining unit by described numeral output according to synchronous serial mode.
Described guard shield, is made up of ferromagnetic, to putting into light path module therein, circuit module, power module
There is corresponding anti-electromagnetic shielding, waterproof, moisture-proof function, leave installation and data output, input interface simultaneously.
The current measuring method of a kind of all-fiber current transformator, the continuous light that light source sends is divided into two bundle polarization directions
Orthogonal light, after upconversion fiber receives this light, is converted into left-handed and right-handed elliptical by this two bundles vertical linear polarisation light
Polarized light, through circumferentially propagating in sensor fibre, this two-way polarized light is reflected by a reflector, simultaneously two bundle elliptically polarized lights
Direction of rotation be also reversed；Two-way reflects light back at upconversion fiber, is converted into the mutually perpendicular linearly polarized photon of two-way
Bundle, finally reverts to the mutually perpendicular polarized light of two-way, after this two-beam is transmitted back to signal processing unit, signal processing unit evidence
This is calculated electric current.
Described signal processing unit obtains phase contrast according to the phase difference calculating of the two-beam returned.
Compared with prior art, the present invention at least has the advantages that all-fiber current transformator energy consumption is low, cost
Low, measure accurately, stable performance, safe and reliable, it is easy to install and safeguard, it is to avoid electromagnetic transformer energy consumption is high, easily produce
Open circuit and the deficiency of explosion danger, eliminate electronic mutual inductor simultaneously and stably differ, easily by the shortcoming of the interference of electromagnetic field.
[accompanying drawing explanation]
Fig. 1 shows the structure chart of sensing unit in the present invention.
Fig. 2 shows sensing unit A-A structure chart 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 plate；2, ring-like flange；3, sensor fibre；4, upconversion fiber；5, reflecting mirror；6, polarization maintaining optical fibre.
[detailed description of the invention]
Below in conjunction with the accompanying drawings and the present invention is described in further detail by instantiation.
A kind of all-fiber current transformator based on Faraday magnetooptical effect principle, it is mainly by sensing unit, signal
Reason unit and combining unit three part composition.Described sensing unit uses Faraday magnetooptical effect principle, is used for sensing tested leading
The electric current of body, and generate light intensity signal and carry the data message of Faraday angle of rotation.Described signal processing unit mainly completes
Input, the output parsing of optical signal, digitized processing, temperature-compensating etc. to sensing unit optical signal, and same according to specify
Step serial mode exports.Described combining unit completes the synchronization to signal processing unit information and also row logic, and transmits
To electric testing instrument and relay protection device.
Fig. 1,2 showing the structure chart of sensing unit in the present invention, described sensing unit is circular ring type structure, its mainly by
Ring-like cover plate 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, certainty of measurement and ring-like flange 2, calculates the length of sensor fibre 3, in sense light
One end welding reflecting mirror 5 of fine 3, makes the cross section angle at 45 ° of reflecting mirror 5 and optical fiber.The other end of sensor fibre 3 and conversion light
Fine 4 weldings, make the fibre core of two optical fiber align.Simultaneously by the other end of upconversion fiber 4 and polarization maintaining optical fibre 6 welding, make during welding
Both fibre cores align.After welding completes, turned to end to end close ring and be fixed on ring-like flange U-type groove
In, and make reflecting mirror 5 and upconversion fiber 3 be parallel to each other in the tangential direction of U-type groove, and the tangential direction of annularly structure is close to
Arranging, polarization maintaining optical fibre 6 is drawn from the outlet of ring-like flange 2, with follow-up data processing unit as the exit of sensing unit
Connect.
Described 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；Described 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, and described annular cover plate is insulant, plays shell faradism
Stream has the effect of blocking-up, and both play a protective role to being placed on optical device therein after coordinating.
Fig. 3 show the system diagram of all-fiber current transformator in the present invention, and whole system is divided into 3 parts by function, point
It not sensing unit, signal processing unit, combining unit.Sensing unit uses Faraday magnetooptical effect principle, is used for sensing quilt
Survey the electric current of conductor, and generate light intensity signal and carry the data message of Faraday angle of rotation.It is right that signal processing unit mainly completes
The input of sensing unit optical signal, the output parsing of optical signal, digitized processing etc., and enter according to the synchronous serial mode of regulation
Row output.Combining unit complete the synchronization to signal processing unit information, switching or and row logic, and be transferred to electric measurement instrument
Device and relay protection device.
Described signal processing unit is mainly made up of light path module, circuit module, power module and guard shield.Light path
Module completes the transmitting of optical signal, receives, measures and export, circuit module receiving light path module data information, and is converted
Become digital signal output.
Described light path module, mainly by optics groups such as generating laser, bonder, polariser, photodetectors
Become, sensing unit is launched two bundle linearly polarized photons, simultaneously to the two bundle linearly polarized photons reflected, uses Sagnac to interfere
Principle, measures the phase contrast of two bundle polarized light.
Described circuit module, by the parsing to phase contrast, correspondence goes out tested electric current, by measurement result according to synchronizing string
Line mode exports to combining unit.
Described power module, is the power supply that will be externally supplied, and is converted into the magnitude of current needed for each electronic devices and components or electricity
Pressure amount.
Described guard shield, is made up of ferromagnetic, to putting into light path module therein, circuit module, power module
There is corresponding anti-electromagnetic shielding, waterproof, moisture-proof function, leave installation and data output, input interface simultaneously.
In figure 3, all-fiber current transformator measure electric current to realize process as follows: the light source in data processing unit exists
Under working condition, the continuous light sent is after bonder, the polarizer being polarized is two bundle linearly polarized photons, is modulated device and completes
Phase-modulation is also divided into the two orthogonal light in bundle polarization direction, exports through polarization maintaining optical fibre；Sensor fibre at sensing unit
Front end, two bundle vertical linear polarisation light are converted into left-handed and right-handed elliptical polarization light by upconversion fiber, and elliptically polarized light is in sensing
Optical fiber is circumferentially propagated；After two-way polarized light has turned a few circle around conductor, the terminal at sensor fibre has a reflecting mirror, right
Two-beam reflects, and the direction of rotation of two bundle elliptically polarized lights is also reversed simultaneously；Two-way light returns at upconversion fiber, conversion
They are transferred to the mutually perpendicular linear polarized beam of two-way by optical fiber again, polarization maintaining optical fibre pass polariser back, revert to two-way mutual
Perpendicular polarized light, there is coherent superposition in two-beam ripple at ray detector.
When no current in conductor, the relative propagation velocity of two-beam is identical, does not has at photodetector during coherent superposition
There is phase contrast；When conductor has electric current, electromagnetic field can be produced around electrical conductor, under the effect of electromagnetic field, round
Two bundle 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
One tunnel elliptical polarization optical retardation, another road elliptical polarization acceleration by light, the reflecting mirror of sensor fibre terminal, reflects two ways of optical signals
Go back, make the acceleration of two bundle elliptically polarized lights, the effect of deceleration be doubled owing to reversing, the now spread speed of two-beam
There is change relatively, phase contrast i.e. occurs.
The phase contrast of two ways of optical signals and tested electric current have strict corresponding relation, by measuring the phase contrast pair of two-beam
The size of tested electric current should be gone out, and metrical information uses digital output process data single to combining unit, combining unit
The digital information of unit carries out digital quantity conversion according to IEC61850-9-2LE stipulations, and output is to relay protection system and electric current
Measuring instrument.
When reality is applied, sensing unit is phase structure, is separately mounted to the outside of tested electric current mutually, and data process
Unit and sensing unit one_to_one corresponding, be placed on the spot or in intelligent cabinet, and combining unit is three-phase common type, is placed on intelligence control
Cabinet processed or protection indoor.
Above content is to combine the detailed description made for the present invention of concrete optimal way, it is impossible to assert the reality of the present invention
The mode of executing is only limitted to this, for general technical staff of the technical field of the invention, all according to spirit of the invention
Any simple modification made and equivalent structure transformation or modification, belong to that claims that the present invention submitted to determine is special
Profit protection domain.
Claims (10)
1. one kind based on Faraday magnetooptical effect principle all-fiber current transformator, it is characterised in that: include sensing unit, signal
Processing unit, and combining unit, described combining unit is connected with electric testing instrument and relay protection device, and described sensing is single
Unit includes the sensor fibre (3) turning to end to end close ring, and the head and the tail of this sensor fibre are separately installed with reflecting mirror
And upconversion fiber (4) (5), in described signal processing unit, it is provided with light source, after the light that this light source sends is divided into two-beam, warp
Upconversion fiber is converted to the two-beam that direction of rotation is contrary, through, after transmission in sensor fibre, being reflected by a reflector.
A kind of all-fiber current transformator the most according to claim 1, it is characterised in that: described upconversion fiber (4) is
Helical structure birefringence fiber, including incremental Double helix section and uniform Double helix section.
A kind of all-fiber current transformator the most according to claim 1, it is characterised in that: described reflecting mirror (5) and sensing
The cross section of optical fiber (3) is 45 ° of angles.
A kind of all-fiber current transformator the most according to claim 1, it is characterised in that: described sensor fibre is arranged on ring
In the U-lag of shape flange, described reflecting mirror (5) and upconversion fiber (4) are parallel to each other in the tangential direction of U-type groove.
A kind of all-fiber current transformator the most according to claim 1, it is characterised in that: described reflecting mirror (5) and conversion
The normal direction of optical fiber (4) annularly structure is close to arrange.
A kind of all-fiber current transformator the most according to claim 4, it is characterised in that: described annular flange (2) is
Metal material, the ring-like cover plate (1) of top covering insulating material, block the faradic current of annular flange.
A kind of all-fiber current transformator the most according to claim 1, it is characterised in that: described signal processing unit includes
Light path module, circuit module, power module and guard shield, described light path module is used for launching, receive and measuring optical signal, defeated
Going out the phase contrast of two-beam, described circuit module is for resolving the phase contrast of two-beam, and with this calculating current, and by result with
Digital signal exports.
A kind of all-fiber current transformator the most according to claim 7, it is characterised in that: described light path module includes launching
Bonder that the generating laser of light source, the light sending light source couple, light source is divided into rising of two bundle linearly polarized photons
Device, the manipulator being connected with the polarizer, carry out the ray detector of interferometry to two-beam partially.
A kind of all-fiber current transformator the most according to claim 7, it is characterised in that: described guard shield, by ferrum
Magnetic material is made, to putting into light path module therein, circuit module, power module have corresponding anti-electromagnetic shielding, anti-
Water, moisture-proof function, leave installation and data output, input interface simultaneously.
10. a current measuring method based on the all-fiber current transformator described in claim 1, it is characterised in that: data
The light that light source in processing unit sends is after bonder, and being polarized is two bundle linearly polarized photons, is modulated device and completes phase place tune
Make and be divided into the two orthogonal light in bundle polarization direction, exporting through polarization maintaining optical fibre；Upconversion fiber is by two bundle vertical linear polarisation
Light is converted into left-handed and right-handed elliptical polarization light, and elliptically polarized light is circumferentially propagated in sensor fibre；Two-way polarized light around
After conductor has turned a few circle, the terminal at sensor fibre has a reflecting mirror, reflects two-beam, simultaneously two bundle elliptical polarization
The direction of rotation of light is also reversed；Two-way light returns at upconversion fiber, and it is mutually perpendicular that upconversion fiber transfers them to two-way again
Linear polarized beam, is passed back polariser by polarization maintaining optical fibre, reverts to the mutually perpendicular polarized light of two-way, and two-beam ripple is visited at light source
Survey and coherent superposition occurs at device；
When no current in conductor, the relative propagation velocity of two-beam is identical, does not has phase at photodetector during coherent superposition
Potential difference；When there being electric current in conductor, the appearance phase contrast of two-beam, the phase contrast of two ways of optical signals and tested electric current have strict
Corresponding relation, goes out the size of tested electric current by the phase contrast correspondence measuring two-beam.
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| CN201610784671.0A CN106324323B (en) | 2016-08-30 | 2016-08-30 | A kind of all-fiber current transformator and its current measuring method |
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| CN201610784671.0A CN106324323B (en) | 2016-08-30 | 2016-08-30 | A kind of all-fiber current transformator and its current measuring method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107144718A (en) * | 2017-06-15 | 2017-09-08 | 华北电力大学 | Double magnetic circuit complex optics current transformer and its signal processing method |
| CN110988435A (en) * | 2019-11-29 | 2020-04-10 | 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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| CN110988435A (en) * | 2019-11-29 | 2020-04-10 | 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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