CN106124827A - A kind of all-fiber current transformator control system - Google Patents
A kind of all-fiber current transformator control system Download PDFInfo
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- CN106124827A CN106124827A CN201610481645.0A CN201610481645A CN106124827A CN 106124827 A CN106124827 A CN 106124827A CN 201610481645 A CN201610481645 A CN 201610481645A CN 106124827 A CN106124827 A CN 106124827A
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- 239000000835 fiber Substances 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 239000000523 sample Substances 0.000 claims abstract description 14
- 230000003321 amplification Effects 0.000 claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 13
- 238000013519 translation Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention provides a kind of all-fiber current transformator control system, belong to fiber optic communication field, including optical fiber sensing probe, optical phase modulator, optical-electrical converter, amplification and filter circuit, A/D change-over circuit, controller circuitry, computer, D/A change-over circuit and drive circuit.The outfan of optical fiber sensing probe is connected with the input of optical phase modulator；The outfan of optical phase modulator is connected with the input of optical-electrical converter；The outfan of optical-electrical converter is connected with the input of amplification and filter circuit；Amplify and the outfan of filter circuit is connected with the input of A/D change-over circuit.The outfan of A/D change-over circuit is connected with controller circuitry；Controller circuitry one outfan is connected with D/A change-over circuit, and another outfan is connected with computer；The outfan of D/A change-over circuit is connected with optical phase modulator through drive circuit.
Description
Technical field
The present invention relates to fiber optic communication field, specifically relate to a kind of all-fiber current transformator control system.
Background technology
Current transformer detects capital equipment as high-voltage fence, the most only electric energy metering provide parameter, and be for
The foundation of relay protection offer action.Along with country's intelligent grid and the development of extra-high voltage grid, conventional electromagnetic Current Mutual Inductance
Device gradually exposes its critical defect, such as under extremely difficult, the higher voltage of insulating during voltage levels, easily magnetic saturation causes surveying
Degradation under accuracy of measurement.By contrast, optical fiber current mutual inductor have that anti-electromagnetic interference capability is strong, insulation is reliable, certainty of measurement is high,
The plurality of advantages such as simple in construction and compact, is current research focus.
As the core component of optical fiber current mutual inductor, its detection and control circuit current transformer are examined as high-voltage fence
The metering surveying capital equipment, the most only electric energy provides parameter, and is the foundation for relay protection offer action.Along with country's intelligence
Energy electrical network and the development of extra-high voltage grid, conventional electromagnetic current transformer gradually exposes its critical defect, such as high voltage
Under extremely difficult, the higher voltage of insulating during grade, easily magnetic saturation causes degradation under certainty of measurement.Accordingly, it would be desirable to design one has anti-
The all-fiber current transformator control system that electromagnetic interference capability is strong, insulation is reliable, certainty of measurement is high.
Summary of the invention
What the present invention needed solution is the problem that existing system electromagnetic current transducer certainty of measurement is low, it is provided that a kind of full light
Fiber current mutual inductor control system.
The present invention solves the problems referred to above by the following technical programs:
A kind of all-fiber current transformator control system, including optical fiber sensing probe, optical phase modulator, opto-electronic conversion
Device, amplification and filter circuit, A/D change-over circuit, controller circuitry, computer, D/A change-over circuit and drive circuit；
The outfan of described optical fiber sensing probe is connected with the input of optical phase modulator；Described optical phase modulator
Outfan is connected with the input of optical-electrical converter；The outfan of described optical-electrical converter and amplification and the input of filter circuit
Connect；The outfan of described amplification and filter circuit is connected with the input of A/D change-over circuit；Described A/D change-over circuit defeated
Go out end to be connected with controller circuitry；Described controller circuitry one outfan is connected with D/A change-over circuit, another outfan and calculating
Machine connects；The outfan of described D/A change-over circuit is connected with optical phase modulator through drive circuit.
In such scheme, preferably controller circuitry includes processor, D/A translation interface, A/D translation interface, serial ports
Interface and wave filter, the input of described D/A translation interface is connected with including processor；The outfan of described A/D translation interface with
Processor connects；The input of described wave filter is connected with processor；The outfan of wave filter is through serial interface with computer even
Connect.
In such scheme, preferably amplify and filter circuit includes amplifier and wave filter；The input of amplifier with
The outfan of optical-electrical converter connects；The filtered device of outfan of described amplifier is connected with A/D change-over circuit.
In such scheme, preferably amplifier uses difference amplifier AD8130.
In such scheme, preferably optical-electrical converter is photodiode, it is achieved optical signal is transferred to the signal of telecommunication.
In such scheme, preferably optical fiber sensing probe, its structure is that bare fibre outer layer is surrounded by plastic protective sleeve, in case
The most extraneous hard thing damage to optical fiber.
Advantages of the present invention with effect is:
1. the present invention uses processor FPGA realize signals collecting, data output and control sum with compunication etc.
According to demodulation, integral filtering, staircase waveform produce scheduling algorithm, complete the detection to optical fiber current mutual inductor sensing head output signal with
And closed loop control；
2. the present invention has simple in construction, integrated level is high, closed loop control speed is fast, control accuracy high, for developing
The all-fiber current transformator meeting electric power network testing requirement is laid a good foundation；
3. the present invention is after tested, all achieves 0.2S level and measure accurately in the range of its rated primary current 100A-4000A
Degree, tentatively meets the electric power network requirement to current transformer accuracy of measurement.
Accompanying drawing explanation
Fig. 1 is present configuration block diagram.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
A kind of all-fiber current transformator control system, as it is shown in figure 1, include optical fiber sensing probe, optical phase modulator,
Optical-electrical converter, amplification and filter circuit, A/D change-over circuit, controller circuitry, computer, D/A change-over circuit and driving electricity
Road.Optical fiber sensing probe, its structure is that bare fibre outer layer is surrounded by plastic protective sleeve, to prevent the extraneous hard thing damage to optical fiber.
The outfan of described optical fiber sensing probe is connected with the input of optical phase modulator；Described optical phase modulator
Outfan is connected with the input of optical-electrical converter；The outfan of described optical-electrical converter and amplification and the input of filter circuit
Connect；The outfan of described amplification and filter circuit is connected with the input of A/D change-over circuit；Described A/D change-over circuit defeated
Go out end to be connected with controller circuitry；Described controller circuitry one outfan is connected with D/A change-over circuit, another outfan and calculating
Machine connects；The outfan of described D/A change-over circuit is connected with optical phase modulator through drive circuit.
Controller circuitry includes processor, D/A translation interface, A/D translation interface, serial interface and wave filter, described D/A
The input of translation interface is connected with including processor；The outfan of described A/D translation interface is connected with processor；Described wave filter
Input be connected with processor；The outfan of wave filter is connected with computer through serial interface.Wherein, processor mainly uses
Fpga chip, FPGA is the core that optical fiber current mutual inductor control circuit realizes signal detection and closed loop control.Its major function
It is responsible for generating the control sequential of whole control system；Complete A/D acquisition controlling and digital independent, storage；To the number collected
Word signal is processed by predetermined solution mediation integral algorithm, and the data after processing are being sent to the same of staircase waveform generating algorithm
Time, pass to serial interface after filtered process, complete the data communication with computer；Additionally will be by staircase waveform generating algorithm
The data produced export corresponding analogue signal with control D/A converter after square wave data investigation.After circuit electrification reset, FPGA
Program loads and to peripheral A/D, D/A and other programme control circuts and interface initialization；The internal time-sequence control mode of FPGA produces week
The modulated square wave of phase 5 μ s, this modulated square wave controls interface by D/A and exports D/A generation same modulus of periodicity plan square-wave signal
And controlling the phase shift of generation ± pi/2 on the photomodulator of rear end, it is ensured that the phase-detection sensitivity of front end Fibre Optical Sensor part is the highest；
Analog-digital converter front end input signal is the AC signal containing phase information, the low and high level difference of this signal and phase contrast
It is directly proportional, just can indirectly obtain current phase difference value by the low and high level difference detecting this signal, thus according to above institute
Stating theoretical acquisition corresponding current size, this signal period is consistent with square-wave cycle.
Amplify and filter circuit includes amplifier and wave filter；The input of amplifier connects with the outfan of optical-electrical converter
Connect；The filtered device of outfan of described amplifier is connected with A/D change-over circuit.Owing to optical-electrical converter output signal is more weak,
And the noise information containing upper frequency, need it is amplified and just can carry out after Filtering Processing follow-up A/D conversion
It is quantified as digital signal.Therefore amplify and filter circuit on the amplification of useful signal and can affect follow-up survey to noise inhibiting ability
Accuracy of measurement.Amplifier uses difference amplifier AD8130, and this chip has the highest common mode rejection ratio, is particularly well-suited to faint letter
Need in the application of low noise, low harmonics distortion and high cmrr in number amplifying.The exchange of optical-electrical converter output is effective
Square-wave signal frequency is about 200kHz, for ensureing that this square-wave signal is undistorted by rear end filter circuit, the height of filter circuit
Frequently cut-off frequency must with do not lose 20 times square wave fundamental frequency signal harmonic wave design, simultaneously for avoid high-frequency noise entrance A/D
Change-over circuit, high-frequency cut-off bandwidth can not be the widest, uses the pi type filter of 4MHz bandwidth to realize front-end filtering in the design.
Optical-electrical converter is photodiode, it is achieved optical signal is transferred to the signal of telecommunication.The signal of telecommunication after conversion is more weak, and
And the noise information containing upper frequency, need it to be amplified and after Filtering Processing, just can carry out follow-up A/D amount of translation
Turn to digital signal.
For ensureing 0.2S level accuracy of measurement, A/D conversion figure place needs to reach more than 10.Additionally, it is right for ensureing
200kHz square-wave signal each cycle low and high level sampling number, such that it is able to improve sampling precision by cumulative being averaging,
Need within each cycle square wave low and high level carry out respectively 20 times with up-sampling after be averaging, this will adopt by modulus number converter
Sample rate retains certain surplus and uses quantization digit 14, the analog-digital converter of sample rate 20MS/s in designing more than 8MS/s.
AD9248. this chip uses the multistage differential pipeline structure correcting logic with output error, is integrated with two high-performance
Sample/hold amplifier and a reference voltage source, it is only necessary to provide and control clock, its conversion data are automatic after 7 clocks
Occur in FPDP, very convenient for split-second timing occasion.
Below preferred embodiment to the invention is illustrated, but the present invention is not limited to embodiment,
Those of ordinary skill in the art also can make on the premise of the invention spirit all equivalents modification or
Replacing, modification or the replacement of these equivalents are all contained in scope of the present application.
Claims (6)
1. an all-fiber current transformator control system, it is characterised in that: include optical fiber sensing probe, optical phase modulator,
Optical-electrical converter, amplification and filter circuit, A/D change-over circuit, controller circuitry, computer, D/A change-over circuit and driving electricity
Road；
The outfan of described optical fiber sensing probe is connected with the input of optical phase modulator；The output of described optical phase modulator
End is connected with the input of optical-electrical converter；The outfan of described optical-electrical converter connects with the input of amplification and filter circuit
Connect；The outfan of described amplification and filter circuit is connected with the input of A/D change-over circuit；The output of described A/D change-over circuit
End is connected with controller circuitry；Described controller circuitry one outfan is connected with D/A change-over circuit, another outfan and computer
Connect；The outfan of described D/A change-over circuit is connected with optical phase modulator through drive circuit.
A kind of all-fiber current transformator control system the most according to claim 1, it is characterised in that: described controller electricity
Road includes processor, D/A translation interface, A/D translation interface, serial interface and wave filter, the input of described D/A translation interface
It is connected with including processor；The outfan of described A/D translation interface is connected with processor；The input of described wave filter and processor
Connect；The outfan of wave filter is connected with computer through serial interface.
A kind of all-fiber current transformator control system the most according to claim 1, it is characterised in that: described amplification and filter
Wave circuit includes amplifier and wave filter；The input of amplifier is connected with the outfan of optical-electrical converter；Described amplifier
The filtered device of outfan is connected with A/D change-over circuit.
A kind of all-fiber current transformator control system the most according to claim 3, it is characterised in that: described amplifier is adopted
By difference amplifier AD8130.
A kind of all-fiber current transformator control system the most according to claim 1, it is characterised in that: described opto-electronic conversion
Device is photodiode, it is achieved optical signal is transferred to the signal of telecommunication.
A kind of all-fiber current transformator control system the most according to claim 1, it is characterised in that: described Fibre Optical Sensor
Probe, its structure is that bare fibre outer layer is surrounded by plastic protective sleeve, to prevent the extraneous hard thing damage to optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610481645.0A CN106124827A (en) | 2016-06-24 | 2016-06-24 | A kind of all-fiber current transformator control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610481645.0A CN106124827A (en) | 2016-06-24 | 2016-06-24 | A kind of all-fiber current transformator control system |
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| CN106124827A true CN106124827A (en) | 2016-11-16 |
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| CN201610481645.0A Pending CN106124827A (en) | 2016-06-24 | 2016-06-24 | A kind of all-fiber current transformator control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459291A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | All-fiber current transformator control circuit system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204177846U (en) * | 2014-11-04 | 2015-02-25 | 金陵科技学院 | A kind of optical fiber control circuit based on simple and easy amplifilter |
| CN204177847U (en) * | 2014-11-04 | 2015-02-25 | 金陵科技学院 | A kind of fiber optic circuit control circuit |
| CN204287286U (en) * | 2014-11-04 | 2015-04-22 | 金陵科技学院 | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit |
-
2016
- 2016-06-24 CN CN201610481645.0A patent/CN106124827A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204177846U (en) * | 2014-11-04 | 2015-02-25 | 金陵科技学院 | A kind of optical fiber control circuit based on simple and easy amplifilter |
| CN204177847U (en) * | 2014-11-04 | 2015-02-25 | 金陵科技学院 | A kind of fiber optic circuit control circuit |
| CN204287286U (en) * | 2014-11-04 | 2015-04-22 | 金陵科技学院 | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459291A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | All-fiber current transformator control circuit system |
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Application publication date: 20161116 |
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