CN106443551A - Full-optical fiber current transformer monitoring system - Google Patents
Full-optical fiber current transformer monitoring system Download PDFInfo
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- CN106443551A CN106443551A CN201610899030.XA CN201610899030A CN106443551A CN 106443551 A CN106443551 A CN 106443551A CN 201610899030 A CN201610899030 A CN 201610899030A CN 106443551 A CN106443551 A CN 106443551A
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- fiber current
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- monitoring system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention belongs to the technical field of optical fibers, and discloses a full-optical fiber current transformer monitoring system. The full-optical fiber current transformer monitoring system comprises a full-optical fiber current transformer testing host, a sensing optical fiber loop and an upper computer, wherein the testing host comprises an optical path system and a circuit system; the optical path system comprises a light source, a light source detector, a coupler and a polarizer; the circuit system comprises a phase modulator and a signal processing system; the signal processing system is connected with the upper computer, and is used for outputting a monitoring signal obtained by the light source detector to the upper computer, and the monitoring signal comprises one or multiple of demodulation waveform, minimum interference light intensity, maximum interference light intensity and temperature compensation signals. The full-optical fiber current transformer monitoring system has the advantages that under the condition of not using a combining unit and a check instrument, the principle demonstration can be performed on an open-loop system and a closed-loop system of a full-optical fiber current transformer; the structure of the testing system is simplified, and the testing cost is reduced; the running states of the optical path and circuit of the system are monitored by the upper computer in real time through digital quantity.
Description
Technical field
The invention belongs to technical field of optical fiber, more particularly, to a kind of all-fiber current transformator monitoring system.
Background technology
With the development of intelligent grid, electronic current mutual inductor just progressively moves to maturity.With conventional current transformer phase
Ratio has advantages below based on the all-fiber current transformator of Faraday magnetooptical effect and Ampere circuital theorem：Not oil-containing；Size
Little；Insulation system is simple；No magnetic saturation phenomenon；Measurement bandwidth and high precision；Anti- electromagnetic interference；High-pressure side intrinsic safety, installs
Mode is flexible.Therefore all-fiber current transformator is considered as the preferable current measuring device of power system.
But the photoelectric device due to using inside all-fiber current transformator and special optical fiber material, and currently universal
There is sizable difference in the conventional current transformer using, lead to the detection meanss of conventional current transformer can not fully reflect
The life expectancy of all-fiber current transformator and performance of operating condition.
It is mutual that complete all-fiber current transformator test system should comprise high/low temperature circulating box, combining unit, normalized current
Sensor and tester, form this apparatus expensive needed for set test system, need larger area occupied, and the power consumption of equipment is larger,
Install and complex operation.Build the initial stage in test system, there is presently no a kind of convenient intuitive way mutual to full optical-fiber current
The open loop of sensor and closed loop system carry out Proof-Of Principle, and equipment does not have intuitive way to carry out monitoring system light path when running yet simultaneously
And the running status of circuit, these inconvenience hinder the further development of all-fiber current transformator.
Content of the invention
In order to solve above-mentioned technology, the invention provides a kind of all-fiber current transformator monitoring system, on host computer
Display in real time needs the monitoring signals of concern such that it is able to more easily realize carrying out Proof-Of Principle to all-fiber current transformator
And the monitoring of system running state.
To achieve these goals, the invention provides a kind of all-fiber current transformator monitoring system, including all -fiber
Current transformer test main frame, sensing fiber ring and host computer, wherein：
Described all-fiber current transformator test main frame includes light path system and Circuits System, wherein said light path system bag
Include light source, ray detector, bonder and the polarizer, the input phase of described light source, ray detector and described bonder
Even, the described polarizer is connected with the outfan of described bonder；Described Circuits System includes phase-modulator and signal processing system
System, described phase-modulator is connected with the outfan of the described polarizer, described signal processing system and described ray detector and
Described phase-modulator is connected；
The outfan of described phase-modulator is connected with ring retard, and described ring retard is connected with described sensing fiber ring；
Described signal processing system is also connected with described host computer, will be defeated for the monitoring signals obtaining from described ray detector
Go out to described host computer, wherein said monitoring signals include following one or more：Demodulation waveforms, minimum interference light intensity, maximum
Interference light intensity and temperature compensation signal.
In one embodiment of the present of invention, described signal processing system includes pre-amplification circuit, analog-digital converter, FPGA
Processing module and peripheral interface circuit, wherein said pre-amplification circuit is used for the original analog to ray detector output
It is amplified；Described analog-digital converter is used for for the analogue signal after amplifying being converted into digital signal；Described FPGA processing module
Monitoring signals for processing to described digital signal, required for obtaining；Described peripheral interface circuit is used for described prison
Survey signal output to host computer or other monitoring devices.
In one embodiment of the present of invention, described FPGA processing module includes filtration module, demodulation module, FT3 agreement mould
Block and square-wave frequency modulation module, wherein：
Amplify the mould with analog-digital converter from the original module signal of described ray detector output by preamplifier
Number conversion after filtering module export to demodulation module, and signal one tunnel that demodulation module demodulates is superimposed with temperature compensation signal
Pass through the packing output of FT3 protocol module afterwards, generate Digital Square-Wave after separately leading up to the cumulative integration of square-wave frequency modulation module, then drive
Dynamic phase-modulator carrys out feedback canceller Faraday effect phase shift；Separately lead up to staircase waveform feedback module and generate step signal
It is superimposed upon on phase-modulator, the signal in light path is modulated.
In one embodiment of the present of invention, described peripheral interface circuit is divided into digital interface and analog interface two parts, its
Described in digital interface include serial ports and optical port, demodulation waveforms, minimum interference light intensity, maximum interference light intensity and temperature-compensating letter
Number exported by described serial ports；On Signal averaging after demodulation, temperature compensation signal is exported by described optical port with FT3 said shank；
Interference waveform is exported by analog interface.
In one embodiment of the present of invention, described light source, the polarizer and phase-modulator are packaged together, and form integration
Light path box.
In one embodiment of the present of invention, described light source is scalable superradiance semiconductor laser, centre wavelength
1310nm, bandwidth 40nm, power adjustable scope 0～1mw.
In one embodiment of the present of invention, described sensing fiber ring includes λ/4 wave plate, protects circular fiber and reflecting mirror, wherein
λ/4 wave plate adopts elliptical core fiber, and the input of wave plate and the welding at 45 ° of ring retard outfan, and described guarantor's circular fiber adopts
High index of refraction spin fiber, the reflectance of described reflecting mirror is more than 95%.
In one embodiment of the present of invention, described serial ports is additionally operable to receive the instruction of host computer, by adjustment feedback ladder
Whether the generation of ripple carries out the switching of open loop and closed loop to phase-modulator.
In one embodiment of the present of invention, described all-fiber current transformator test main frame also includes extension and protects off-delay
Different length ring retard is conveniently accessed described all-fiber current transformator monitoring system by ring test platform.
In one embodiment of the present of invention, described phase-modulator is lithium niobate phase modulator.
Compared with prior art, the present invention has the advantages that：
(1) present invention passes through to increase signal processing system in all-fiber current transformator monitoring system, can be in real time
System digital output, temperature-compensated digital amount, minimum interference light intensity and maximum interference light intensity export host computer, realize to full light
The Proof-Of Principle of fiber current mutual inductor and the monitoring of system running state；
(2) the all-fiber current transformator monitoring system that, provided by the present invention is it is not necessary to combining unit, normalized current
Transformer and tester just can verify that the principle of all-fiber current transformator the running status of monitoring system, simplify test system
Building and operating of system, has saved testing cost；
(3) in all-fiber current transformator monitoring system of the present invention, from the original module letter of described ray detector output
Number amplified by preamplifier and analog-digital converter analog digital conversion and after filtering module export to demodulation module, solution mode transfer
Signal one tunnel that block demodulates is exported by the packing of FT3 protocol module after being superimposed with temperature compensation signal, separately leads up to square wave
Modulation module adds up after integrating and generates Digital Square-Wave, then drives phase-modulator to carry out feedback canceller Faraday effect phase shift；Separately
Lead up to staircase waveform feedback module generation step signal to be superimposed upon on phase-modulator, thus carrying out to the signal in light path
Modulation；
(4) present invention can assign instruction by serial ports to described all-fiber current transformator monitoring system, by adjustment
Whether the generation of feedback staircase waveform carries out the switching of open loop and closed loop to phase-modulator；
(5) pass through subsidiary ring retard test platform in test main frame of the present invention, can easily be by the delay of different length
Ring access system is tested.
Brief description
Fig. 1 is the principle schematic of all-fiber current transformator monitoring system in the embodiment of the present invention；
Fig. 2 is the structural representation of all-fiber current transformator monitoring system in the embodiment of the present invention；
Fig. 3 is the structural representation of FPGA processing module in the embodiment of the present invention；
Fig. 4 is the structural representation of ring retard test platform in the embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.As long as additionally, involved technical characteristic in each embodiment of invention described below
The conflict of not constituting each other just can be mutually combined.
In order to realize the purpose of the present invention, as shown in figure 1, a kind of the invention provides all-fiber current transformator monitoring system
System, including all-fiber current transformator test main frame, sensing fiber ring and host computer, wherein：
Described all-fiber current transformator test main frame includes light path system and Circuits System, wherein as shown in Fig. 2 described
Light path system includes light source, ray detector, bonder and the polarizer, described light source, ray detector and described bonder
Input be connected, the described polarizer is connected with the outfan of described bonder；Described Circuits System include phase-modulator and
Signal processing system, described phase-modulator is connected with the outfan of the described polarizer, described signal processing system and described light
Source detector is connected with described phase-modulator；
The outfan of described phase-modulator is connected with ring retard, and described ring retard is connected with described sensing fiber ring；
Described signal processing system is also connected with described host computer, will be defeated for the monitoring signals obtaining from described ray detector
Go out to described host computer, wherein said monitoring signals include following one or more：Demodulation waveforms, minimum interference light intensity, maximum
Interference light intensity and temperature compensation signal.
Wherein, described phase-modulator can be lithium niobate phase modulator.
As shown in Fig. 2 the ultimate principle of above-mentioned all-fiber current transformator monitoring system is as follows：The light that light source sends passes through
It is polarized by the polarizer after bonder, modulated device completes phase-modulation and is divided into the orthogonal light in two bundle polarization directions, passes through
Sensor fibre is entered after postponing optical fiber.Return after the reflected mirror of sensor fibre end two-beam ripple, be eventually returned to photodetection
At device and coherent superposition occurs, it is converted into the signal of telecommunication through photodetector.Digital output after Circuits System demodulation is given upper
Position machine carries out the monitoring of real-time system state.
As shown in figure 3, described signal processing system includes pre-amplification circuit, analog-digital converter, FPGA (Field
Programmable Gate Array, field programmable gate array) processing module and peripheral interface circuit, wherein said preposition
Amplifying circuit is used for the original analog of ray detector output is amplified；After described analog-digital converter is used for amplifying
Analogue signal be converted into digital signal；Described FPGA processing module is used for described digital signal is processed, and obtains required
The monitoring signals wanted；Described peripheral interface circuit is used for for described monitoring signals exporting host computer or other monitoring devices.
Further, as shown in figure 3, described FPGA processing module includes filtration module, demodulation module, FT3 protocol module
And square-wave frequency modulation module, wherein：
Amplify the mould with analog-digital converter from the original module signal of described ray detector output by preamplifier
Number conversion after filtering module export to demodulation module, and signal one tunnel that demodulation module demodulates is superimposed with temperature compensation signal
Pass through the packing output of FT3 protocol module afterwards, generate Digital Square-Wave after separately leading up to the cumulative integration of square-wave frequency modulation module, then drive
Dynamic phase-modulator carrys out feedback canceller Faraday effect phase shift；Separately lead up to staircase waveform feedback module and generate step signal
It is superimposed upon on phase-modulator, the signal in light path is carried out with the modulation of ± pi/2.
Further, as shown in figure 3, described peripheral interface circuit is divided into digital interface and analog interface two parts, wherein
Described digital interface includes serial ports and optical port, demodulation waveforms, minimum interference light intensity, maximum interference light intensity and temperature compensation signal
Exported by described serial ports；On Signal averaging after demodulation, temperature compensation signal is exported by described optical port with FT3 said shank；Dry
Relate to waveform to export by analog interface.
Using the concrete mode that all-fiber current transformator monitoring system of the present invention monitors each signal it is：
After the original module signal of described ray detector output is amplified by preamplifier, analog-digital converter extracts
The maximum of interference signal and minima are simultaneously exported by serial ports after module conversion；
The digital quantity of analog-digital converter output is after filtering after module and demodulation module, by staircase waveform feedback module according to one
Determine control algolithm and form feedback digital step signal, and be converted into analogue signal by digital to analog converter to be added to Lithium metaniobate modulation
On device, to offset Faraday effect phase contrast.The shoulder height value of staircase waveform is just become with the size of current test electric current simultaneously
Than, therefore using this value as whole system digital output to host computer.
Square-wave frequency modulation module is used for generating Digital Square-Wave and is superimposed upon lithium niobate modulator, the signal in light path is carried out ±
The modulation of pi/2.
Temperature compensating signal leads up to FT3 protocol module and is superimposed to original figure amount to be brought to system accuracy for compensation temperature
Error, separately leads up to serial ports and exports to host computer the compensation effect being used for real-time monitoring high/low temperature district system.
By maximum interference signal, minimum interference signal, system digits amount exports serial ports, and temperature compensation value transmits supreme successively
Position machine, for the running status of real-time monitoring system light path and Circuits System.Serial ports can also receive the instruction of host computer, passes through
Whether the generation of adjustment feedback staircase waveform carries out the switching of open loop and closed loop to system.
Further, described light source, the polarizer and phase-modulator can be packaged together, and form the light path of integration
Box.Wherein said light source can be scalable superradiance semiconductor laser, centre wavelength 1310nm, bandwidth 40nm, and power can
Adjust scope 0～1mw.
Further as shown in figure 3, described sensing fiber ring includes λ/4 wave plate, protects circular fiber and reflecting mirror, wherein λ/4
Wave plate adopts elliptical core fiber, and the input of wave plate and the welding at 45 ° of ring retard outfan, and described guarantor's circular fiber is using high folding
Penetrate rate spin fiber, the reflectance of described reflecting mirror is more than 95%.
Further as shown in figure 4, described all-fiber current transformator test main frame also includes extension protects off-delay ring
Different length ring retard is conveniently accessed described all-fiber current transformator monitoring system by test platform.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not in order to
Limit the present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should comprise
Within protection scope of the present invention.
Claims (10)
1. a kind of all-fiber current transformator monitoring system is it is characterised in that include all-fiber current transformator test main frame, biography
Sense fiber optic loop and host computer, wherein：
Described all-fiber current transformator test main frame includes light path system and Circuits System, and wherein said light path system includes light
Source, ray detector, bonder and the polarizer, described light source, ray detector are connected with the input of described bonder, institute
The outfan stating the polarizer with described bonder is connected；Described Circuits System includes phase-modulator and signal processing system, institute
The outfan stating phase-modulator with the described polarizer is connected, described signal processing system and described ray detector and described phase
Position manipulator is connected；
The outfan of described phase-modulator is connected with ring retard, and described ring retard is connected with described sensing fiber ring；
Described signal processing system is also connected with described host computer, and the monitoring signals obtaining from described ray detector are exported
Described host computer, wherein said monitoring signals include following one or more：Demodulation waveforms, minimum interference light intensity, maximum interference
Light intensity and temperature compensation signal.
2. all-fiber current transformator monitoring system as claimed in claim 1 is it is characterised in that described signal processing system bag
Include pre-amplification circuit, analog-digital converter, FPGA processing module and peripheral interface circuit, wherein said pre-amplification circuit is used for
The original analog of ray detector output is amplified；Described analog-digital converter is used for turning the analogue signal after amplifying
Change digital signal into；Described FPGA processing module is used for described digital signal is processed, the monitoring signals required for obtaining；
Described peripheral interface circuit is used for for described monitoring signals exporting host computer or other monitoring devices.
3. all-fiber current transformator monitoring system as claimed in claim 2 is it is characterised in that described FPGA processing module bag
Include filtration module, demodulation module, FT3 protocol module and square-wave frequency modulation module, wherein：
Amplified by preamplifier from the original module signal of described ray detector output and the modulus of analog-digital converter turns
Change and module exports to demodulation module after filtering, signal one tunnel that demodulation module demodulates is logical after being superimposed with temperature compensation signal
Cross the packing output of FT3 protocol module, generate Digital Square-Wave after separately leading up to the cumulative integration of square-wave frequency modulation module, then drive phase
Position manipulator carrys out feedback canceller Faraday effect phase shift；Separately lead up to staircase waveform feedback module and generate step signal superposition
On phase-modulator, the signal in light path is modulated.
4. all-fiber current transformator monitoring system as claimed in claim 2 or claim 3 is it is characterised in that described peripheral interface is electric
Road is divided into digital interface and analog interface two parts, and wherein said digital interface includes serial ports and optical port, demodulation waveforms, minimum dry
Relate to light intensity, maximum interference light intensity and temperature compensation signal to export by described serial ports；Temperature-compensating on Signal averaging after demodulation
Signal is exported by described optical port with FT3 said shank；Interference waveform is exported by analog interface.
5. all-fiber current transformator monitoring system according to claim 1 and 2 is it is characterised in that described light source, be polarized
Device is packaged together with phase-modulator, forms the light path box of integration.
6. all-fiber current transformator monitoring system as claimed in claim 5 is it is characterised in that described light source surpasses for scalable
Radiation-emitting semi-conductor laser instrument, centre wavelength 1310nm, bandwidth 40nm, power adjustable scope 0～1mw.
7. all-fiber current transformator monitoring system as claimed in claim 1 or 2 is it is characterised in that described sensing fiber ring
Including λ/4 wave plate, protect circular fiber and reflecting mirror, wherein λ/4 wave plate adopts elliptical core fiber, and the input of wave plate and ring retard
Outfan welding at 45 °, described guarantor's circular fiber adopts high index of refraction spin fiber, and the reflectance of described reflecting mirror is more than 95%.
8. all-fiber current transformator monitoring system as claimed in claim 4 is it is characterised in that described serial ports is additionally operable to receive
Whether the instruction of host computer, carry out the switching of open loop and closed loop by the generation of adjustment feedback staircase waveform to phase-modulator.
9. all-fiber current transformator monitoring system as claimed in claim 1 or 2 is it is characterised in that described full optical-fiber current
Transformer test main frame also includes extension and protects off-delay ring test platform, conveniently different length ring retard is accessed described full light
Fiber current mutual inductor monitoring system.
10. all-fiber current transformator monitoring system as claimed in claim 1 or 2 is it is characterised in that described phase-modulator
For lithium niobate phase modulator.
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| CN109030421A (en) * | 2018-06-15 | 2018-12-18 | 长飞光纤光缆股份有限公司 | A kind of photovoltaic panel monitoring method and system based on reflectivity |
| CN109444796A (en) * | 2018-12-11 | 2019-03-08 | 三河市博维创通企业管理咨询中心(有限合伙) | Fibre optic current sensor optical path states monitor system |
| CN109581266A (en) * | 2018-11-20 | 2019-04-05 | 国网江苏省电力有限公司 | A kind of operation analysis on the health status method of all-fiber current transformator |
| CN110850144A (en) * | 2018-04-12 | 2020-02-28 | 安徽大学 | Voltage sensing measurement device and method based on multi-longitudinal-mode self-mixing effect |
| CN110927431A (en) * | 2019-12-12 | 2020-03-27 | 东南大学 | Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof |
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| CN115561503A (en) * | 2022-11-11 | 2023-01-03 | 北京世维通光智能科技有限公司 | Optical fiber current transformer |
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| CN110850144A (en) * | 2018-04-12 | 2020-02-28 | 安徽大学 | Voltage sensing measurement device and method based on multi-longitudinal-mode self-mixing effect |
| CN110850144B (en) * | 2018-04-12 | 2022-02-18 | 安徽大学 | Voltage sensing measurement device and method based on multi-longitudinal-mode self-mixing effect |
| CN109030421A (en) * | 2018-06-15 | 2018-12-18 | 长飞光纤光缆股份有限公司 | A kind of photovoltaic panel monitoring method and system based on reflectivity |
| CN109581266A (en) * | 2018-11-20 | 2019-04-05 | 国网江苏省电力有限公司 | A kind of operation analysis on the health status method of all-fiber current transformator |
| CN109581266B (en) * | 2018-11-20 | 2021-10-08 | 国网江苏省电力有限公司 | Running health condition analysis method of all-fiber current transformer |
| CN109444796A (en) * | 2018-12-11 | 2019-03-08 | 三河市博维创通企业管理咨询中心(有限合伙) | Fibre optic current sensor optical path states monitor system |
| CN109444796B (en) * | 2018-12-11 | 2024-04-12 | 三河市博维创通企业管理咨询中心(有限合伙) | Optical path state monitoring system of optical fiber current sensor |
| CN111308157A (en) * | 2019-11-14 | 2020-06-19 | 许继集团有限公司 | All-fiber current transformer with quick set-up time and signal processing unit thereof |
| CN111308157B (en) * | 2019-11-14 | 2022-06-17 | 许继集团有限公司 | All-fiber current transformer with quick set-up time and signal processing unit thereof |
| CN110927431A (en) * | 2019-12-12 | 2020-03-27 | 东南大学 | Closed-loop demodulation all-fiber current transformer and large-current waveform hopping problem solving method thereof |
| CN115561503A (en) * | 2022-11-11 | 2023-01-03 | 北京世维通光智能科技有限公司 | Optical fiber current transformer |
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