CN109406852A - A kind of high current current detection sensor based on all -fiber mutual inductor - Google Patents
A kind of high current current detection sensor based on all -fiber mutual inductor Download PDFInfo
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- CN109406852A CN109406852A CN201710714031.7A CN201710714031A CN109406852A CN 109406852 A CN109406852 A CN 109406852A CN 201710714031 A CN201710714031 A CN 201710714031A CN 109406852 A CN109406852 A CN 109406852A
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- fiber
- main part
- mutual inductor
- detection sensor
- optical fiber
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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
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention relates to a kind of high current current detection sensors based on all -fiber mutual inductor, including main part, light source sensing head and adjusting knob, the front of the main part is equipped with light source sensing head, and the top of the main part is equipped with an adjusting knob, and the back side of the main part is equipped with signal output port；Compared with conventional electromagnetic current transformer, structure is simple, there is no the hidden danger that ferromagnetic resonance and magnetic hysteresis are saturated, simultaneously, bandwidth, dynamic range are big, detection accuracy is high, small in size, light-weight, environmental adaptability is good, system anti-electromagnetic interference capability is strong, measurement accuracy is not influenced by extraneous stray magnetic field, and manufacturing cost is low；It is small in size simultaneously, it is light-weight, it is arranged and fixed conveniently.Except fiber section needs to be mounted in electric loop, rest part can be drawn out to other positions with optical fiber, farthest reach 1.5 meters of distances.
Description
Technical field
The invention belongs to photoelectric sense technology field more particularly to a kind of high current electric current inspections based on all -fiber mutual inductor
Survey sensor.
Background technique
Existing high current current detection sensor product, generallys use undesirable mutual electromagnetic inductance technology, has the disadvantage in that 1. insulation knots
Structure is complicated, and cost is exponentially increased, and small product size, weight are huge；2. iron core is easily saturated, secondary output Severe distortion is made
At false protection；3. transient measuring low precision, unfavorable to the reliability and sensitivity of relay protection；4. second open circuit risk；5.
On large scale equipment, insulating oil, the danger such as burning, explosion that insulating oil may cause there are catastrophic failure are such as used.
Summary of the invention
The present invention is to solve well-known technique and provide a kind of high current based on all -fiber mutual inductor
Current detection sensor.
The present invention is adopted the technical scheme that solve well-known technique: one kind is mutual based on all -fiber
The high current current detection sensor of sensor, including main part, light source sensing head and adjusting knob, the front of the main part are equipped with
Light source sensing head, the magnetic field work that the light source sensing head is used to incude optical fiber, the polarised light transmitted in optical fiber is generated by electric current
With phase change occurs, the top of the main part is equipped with an adjusting knob, and the back side of the main part is equipped with signal output port, institute
State and be equipped with coupler in light source sensing head, described coupler one end postpones optical fiber with polarization-maintaining by the polarizer and connect, the other end and
The top of detection unit electrical connection, the polarization-maintaining delay optical fiber constitutes sensing fiber ring, the sensor fibre by repeatedly bending
It is corresponding on ring that reflective mirror and quarter wave plate are installed, it include the photoelectric conversion circuit and preceding amplification electricity of concatenation in the detection unit
Road, and the signal output end of the detection unit is electrically connected by A/D converter with signal processing unit, the signal processing list
It is first to be connect with the upper signal output port.
Further, the signal processing unit is electrically connected by conducting wire with phase-modulator, and conducting wire passes from the above
It is passed through in the middle part of sense fiber optic loop, the phase-modulator is serially connected on polarization-maintaining delay optical fiber.
Further, the angle of the quarter wave plate and the polarizer is respectively 45 °.
It further, include DSP and FPGA in the signal processing unit.
Further, the signal processing unit is connect by D/A converter with conducting wire.
The present invention has the advantage that as follows with good effect:
1. novel optical fibre current sensor of the device based on Faraday magnetooptical effect and Ampère circuital theorem, using reflective Sa
Lattice Neck interferometer all -fiber alternatives formulation forms；Compared with conventional electromagnetic current transformer, structure is simple, there is no ferromagnetic
The hidden danger of resonance and magnetic hysteresis saturation, meanwhile, bandwidth, dynamic range are big, detection accuracy is high, small in size, light-weight, environment adapts to
Performance is good, and system anti-electromagnetic interference capability is strong, and measurement accuracy is not influenced by extraneous stray magnetic field, and manufacturing cost is low.
2. it is small in size, it is light-weight, it is arranged and fixed conveniently.Except fiber section needs to be mounted in electric loop, rest part
It can be drawn out to other positions with optical fiber, farthest reach 1.5 meters of distances.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the high current current detection sensor of the invention based on all -fiber mutual inductor；
Fig. 2 is that the digital closed loop full optical-fiber current of the high current current detection sensor of the invention based on all -fiber mutual inductor is mutual
Sensor overall structure；
Fig. 3 is the whole interior schematic diagram of the high current current detection sensor of the invention based on all -fiber mutual inductor；
Fig. 4 is the whole interior object construction figure of the high current current detection sensor of the invention based on all -fiber mutual inductor.
Fig. 5 is the light beam of the high current current detection sensor of the invention based on all -fiber mutual inductor in sensing head
Locate polarization state change procedure figure.
In figure: a, main part；B, light source sensing head；C, adjusting knob；1, sensing fiber ring；2, reflective mirror；3, quarter wave plate；
4, conducting wire；5, polarization-maintaining postpones optical fiber；6, the polarizer；7, coupler；8, detection unit；9, signal processing unit；10, phase-modulation
Device.
Specific embodiment
In order to further understand the content, features and effects of the present invention, hereby enumerating following embodiment, and cooperate attached drawing
Detailed description are as follows.
Below with reference to Fig. 1-4 pairs of high current current detection sensors based on all -fiber mutual inductor of the invention structure into
One step explanation, a kind of high current current detection sensor based on all -fiber mutual inductor, including main part a, light source sensing head b and
The front of adjusting knob c, the main part a are equipped with light source sensing head 6, and the light source sensing head 6 is for incuding optical fiber, passing in optical fiber
By the magnetic fields that electric current generates phase change is occurred for defeated polarised light, and the top of the main part a is equipped with an adjusting knob c,
The back side of the main part a is equipped with signal output port；Coupler 7, described 7 one end of coupler are equipped in the light source sensing head b
Postpone optical fiber 5 with polarization-maintaining by the polarizer 6 to connect, the other end is electrically connected with detection unit 8, the top of the polarization-maintaining delay optical fiber 5
End constitutes sensing fiber ring 1 by repeatedly bending, and correspondence is equipped with reflective mirror 2 and quarter wave plate 4, institute on the sensing fiber ring 1
Stating includes the photoelectric conversion circuit and preceding amplifying circuit concatenated in detection unit 8, and the signal output end of the detection unit 8 is logical
It crosses A/D converter to be electrically connected with signal processing unit 9, the signal processing unit 9 is connect with the upper signal output port；Institute
It states signal processing unit 9 and is electrically connected with phase-modulator 10 by conducting wire 4, and conducting wire 4 is worn in the middle part of sensing fiber ring 1 from the above
It crosses, the phase-modulator 10 is serially connected on polarization-maintaining delay optical fiber 5；The angle of the quarter wave plate 4 and the polarizer 6 is respectively
45°；It include DSP and FPGA in the signal processing unit 9；The signal processing unit 9 passes through D/A converter and conducting wire
4 connections.
Working principle: the equipments overall structure scheme is as shown in Fig. 2, include optical path and detection circuit two parts.In optical path
It takes reflective, interference-type structure: the light that light source issues is divided into the orthogonal linearly polarized light of two beams after the polarizer 6 immediately,
Sensing head is transmitted to along two modes of polarization maintaining optical fibre 5.At quarter wave plate 3, two bunch polarisations be converted to it is left-handed and
Dextrorotation rotatory polarization, into sensor fibre.In sensor fibre, due to the Faraday magneto-optic effect of current induced magnetic field in conducting wire
The transmission speed of effect, two beam rotatory polarizations is different, to generate Faraday difference.When two beam rotatory polarizations are transferred to sensor fibre
When end, mirror-reflection occurs, two-beam returns after modes swap (left-handed change dextrorotation, dextrorotation become left-handed) along original optical path,
Faraday effect doubles, and the line polarisation of two beam orthogonal modes is again transformed at quarter wave plate 3 (mode is also exchanged).
Finally, the two-beam for carrying Faraday effect phase information interferes at the polarizer 6, is then coupled by three-dB coupler 7
Entering light electric explorer carries out follow-up signal processing.As can be seen that two beam polarised lights are always in two orthogonal modes of same root optical fiber
It is transmitted in formula, so the light path system of mutual inductor has very strong anti-interference ability；Meanwhile as shown in figure 5, due to interfering
Two beam polarised lights all have passed through identical transmission path and patterns of change, only sequentially just opposite.Therefore, optical path system
System also has good reciprocity, and result of interference only carries the phase information of Faraday magneto-optic effect generation；The inspection of mutual inductor
Slowdown monitoring circuit is substantially a kind of digital Lock-in Amplifier based on correlation demodulation, including pre-amplification circuit, A/D conversion electricity
Road, D/A conversion circuit, and using FPGA and DSP as the digital signal processing circuit of core, the main extraction for completing signal is adjusted
The functions such as system, demodulation, and output.This part we use for reference the signal of fiber optical gyroscope handling principle of existing 30 years developing histories, property
It can stablize, technology maturation.From morphosis, all-fiber current transformator product mainly includes high pressure all -fiber sensing head, passes
Lose four parts such as cable, two sub-cell of signal processing (including optical component) and digital communication interface.
(1) all-fiber current transformator technology is used based on orthogonal circular polarizations light in same light path, same to mode, same to polarization state
The current sensing techniques that Faraday effect is utilized under principle, can inhibit comprehensively temperature, mechanical oscillation, stress and fibre-optical bending to make
At interference, ensured the stability and reliability of current sense；It proposes and interferes and lock amplification based on orthogonal double polarizing light
The interference processor technology of technology, greatly improves the detectability and measurement accuracy to faint optical signal.
(2) orhtogonal linear polarizaiton light and orthogonal circular polarizations light are realized using 1/4 optical-fibre wave plate in fibre-optic current inductance loop front end
Mutually conversion keeps electric current mutual than having broader bandwidth and higher temperature stability using traditional bulk optical quarter wave plate
Sensor has brilliant transient measuring and protective value；Fibre-optic current inductance loop end uses advanced cold coating film treatment technology,
The ability for not only increasing temperature stability and anti-vibration also simplifies the technology process of fibre-optic current inductance loop.
(3) interfere the orthogonal polarisation state Electro-optical Modulation and demodulation techniques for using in processor and being delayed based on polarization maintaining optical fibre,
The sensitivity of detection is enhanced while the signal-to-noise ratio of raising system, ensure that optical fiber current mutual inductor can reach broader dynamic
State measurement range.
(4) interference processor uses Digital Signal Processing, and the output of optical fiber current mutual inductor is made both to have had simulation
Signal form, and the digital value of electric current metering can be directly exported, facilitate follow-up signal to handle and apply.
It goes out outside the advantage of above-mentioned optical fiber mutual inductor part, as independent automatic control product, the measurement of this system is adopted
Sample part-fiber optic loop, in the electric power loop inside equipment, signal is exported directly to distal end by optical fiber, enters back into electrical part
Divide and is handled.So saving the bulk in equipment, reduce the electromagnetic interference in equipment, meanwhile, also guarantee measurement
As a result not by the electromagnetic interference in equipment.The electrical equipment of system can be independently installed in suitable position, convenient for constructing and making
With.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (5)
1. a kind of high current current detection sensor based on all -fiber mutual inductor, it is characterised in that: including main part (a), light source
The front of inductive head (b) and adjusting knob (c), the main part (a) is equipped with light source sensing head (6), the light source sensing head (6)
Phase change, the main part (a) occur for the magnetic fields that the polarised light for incuding optical fiber, transmitting in optical fiber is generated by electric current
Top be equipped with an adjusting knob (c), the back side of the main part (a) is equipped with signal output port, in the light source sensing head (b)
Equipped with coupler (7), described coupler (7) one end is connect by the polarizer (6) with polarization-maintaining delay optical fiber (5), the other end and inspection
Unit (8) electrical connection is surveyed, the top of polarization-maintaining delay optical fiber (5) constitutes sensing fiber ring (1) by repeatedly bending, the biography
It is corresponding in sense fiber optic loop (1) that reflective mirror (2) and quarter wave plate (4) are installed, it include the photoelectricity of concatenation in the detection unit (8)
Conversion circuit and preceding amplifying circuit, and the signal output end of the detection unit (8) passes through A/D converter and signal processing unit
(9) it is electrically connected, the signal processing unit (9) connect with the upper signal output port.
2. the high current current detection sensor according to claim 1 based on all -fiber mutual inductor, which is characterized in that institute
It states signal processing unit (9) and is electrically connected with phase-modulator (10) by conducting wire (4), and conducting wire (4) sensor fibre from the above
It is passed through in the middle part of ring (1), the phase-modulator (10) is serially connected in polarization-maintaining delay optical fiber (5).
3. the high current current detection sensor according to claim 1 based on all -fiber mutual inductor, which is characterized in that institute
The angle for stating quarter wave plate (4) and the polarizer (6) is respectively 45 °.
4. the high current current detection sensor according to claim 1 based on all -fiber mutual inductor, which is characterized in that institute
It include DSP and FPGA in the signal processing unit (9) stated.
5. the high current current detection sensor according to claim 1 based on all -fiber mutual inductor, which is characterized in that institute
The signal processing unit (9) stated is connect by D/A converter with conducting wire (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710714031.7A CN109406852A (en) | 2017-08-18 | 2017-08-18 | A kind of high current current detection sensor based on all -fiber mutual inductor |
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| CN201710714031.7A CN109406852A (en) | 2017-08-18 | 2017-08-18 | A kind of high current current detection sensor based on all -fiber mutual inductor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114234954A (en) * | 2022-02-28 | 2022-03-25 | 深圳奥斯诺导航科技有限公司 | Double sensitization optical path integrated optical fiber gyroscope |
| CN114236211A (en) * | 2021-12-01 | 2022-03-25 | 广西大学 | Optical current transformer and external magnetic field interference resisting method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546793A (en) * | 2016-11-01 | 2017-03-29 | 长园深瑞继保自动化有限公司 | Three-phase integratedization all-fiber current transformator |
| CN207215897U (en) * | 2017-08-01 | 2018-04-10 | 山西开元瑞德科技有限公司 | A kind of high current current detection sensor based on all -fiber transformer |
-
2017
- 2017-08-18 CN CN201710714031.7A patent/CN109406852A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546793A (en) * | 2016-11-01 | 2017-03-29 | 长园深瑞继保自动化有限公司 | Three-phase integratedization all-fiber current transformator |
| CN207215897U (en) * | 2017-08-01 | 2018-04-10 | 山西开元瑞德科技有限公司 | A kind of high current current detection sensor based on all -fiber transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236211A (en) * | 2021-12-01 | 2022-03-25 | 广西大学 | Optical current transformer and external magnetic field interference resisting method thereof |
| CN114234954A (en) * | 2022-02-28 | 2022-03-25 | 深圳奥斯诺导航科技有限公司 | Double sensitization optical path integrated optical fiber gyroscope |
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Effective date of registration: 20191021 Address after: 300000 1909, building 2, Hongxing Building, Hedong District, Tianjin Applicant after: Zhao Lian Rui Address before: Xinyi Industrial Park, 033000 Shanxi city of Lvliang province Lishi District No. 2 Applicant before: Shanxi Kaiyuan Reed Technology Co., Ltd. |
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Application publication date: 20190301 |