CN106443551B - A kind of all-fiber current transformator monitoring system - Google Patents
A kind of all-fiber current transformator monitoring system Download PDFInfo
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- CN106443551B CN106443551B CN201610899030.XA CN201610899030A CN106443551B CN 106443551 B CN106443551 B CN 106443551B CN 201610899030 A CN201610899030 A CN 201610899030A CN 106443551 B CN106443551 B CN 106443551B
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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 technical field of optical fiber, disclose a kind of all-fiber current transformator monitoring system, including all-fiber current transformator test host, sensing fiber ring and host computer, wherein: test host includes light path system and circuit system, and light path system includes light source, ray detector, coupler and the polarizer；Circuit system includes phase-modulator and signal processing system；Signal processing system is also connected with the host computer, the monitoring signals obtained from the ray detector are output to the host computer, the monitoring signals include following one or more: demodulation waveforms, minimum interference light intensity, maximum interference light intensity and temperature compensation signal.The present invention in the case where not using combining unit and tester, can open loop to all-fiber current transformator and closed-loop system carry out Proof-Of Principle, simplify test macro composition, reduce testing cost.Host computer is monitored in real time by operating status of the digital quantity to system light path and circuit simultaneously.
Description
Technical field
The invention belongs to technical field of optical fiber, monitor system more particularly, to a kind of all-fiber current transformator.
Background technique
With the development of smart grid, electronic current mutual inductor just gradually moves to maturity.With conventional current mutual inductor phase
Than the all-fiber current transformator based on Faraday magnetooptical effect and Ampère circuital theorem has the advantage that not oil-containing；Size
It is small；Insulation system is simple；Without magnetic saturation phenomenon；Measurement bandwidth and precision are high；Anti- electromagnetic interference；High-pressure side intrinsic safety, installation
Mode is flexible.Therefore all-fiber current transformator is considered as the ideal current measuring device of electric system.
But photoelectric device and special optical fiber material due to using inside all-fiber current transformator, and it is current universal
There are sizable differences for the conventional current mutual inductor used, cause the detection means of conventional current mutual inductor that cannot sufficiently reflect
The life expectancy of all-fiber current transformator and performance of operating condition.
Complete all-fiber current transformator test macro should be mutual comprising high/low temperature circulating box, combining unit, normalized current
Sensor and tester, equipment needed for forming this set test macro is expensive, needs larger area occupied, and the power consumption of equipment is larger,
It installs and complicated for operation.Initial stage is built in test macro, there is presently no a kind of convenient intuitive way is mutual to full optical-fiber current
The open loop of sensor and closed-loop system carry out Proof-Of Principle, while also monitoring system light path without intuitive way when equipment operation
And the operating status of circuit, these inconvenience hinder the further development of all-fiber current transformator.
Summary of the invention
In order to solve above-mentioned technology, the present invention provides a kind of all-fiber current transformators to monitor system, on host computer
Real-time display needs the monitoring signals paid close attention to, and carries out Proof-Of Principle to all-fiber current transformator so as to more easily realize
And the monitoring of system running state.
To achieve the goals above, the present invention provides a kind of all-fiber current transformators to monitor system, including all -fiber
Current transformer tests host, sensing fiber ring and host computer, in which:
The all-fiber current transformator test host includes light path system and circuit system, wherein the light path system packet
Include light source, ray detector, coupler and the polarizer, the input terminal phase of the light source, ray detector and the coupler
Even, the polarizer is connected with the output end of the coupler；The circuit system includes phase-modulator and signal processing system
System, the phase-modulator is connected with the output end of the polarizer, the signal processing system and the ray detector and
The phase-modulator is connected；
The output end of the phase-modulator is connected with ring retard, and the ring retard is connected with the sensing fiber ring；
The signal processing system is also connected with the host computer, and the monitoring signals obtained from the ray detector are defeated
The host computer is arrived out, wherein the 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, the signal processing system includes pre-amplification circuit, analog-digital converter, FPGA
Processing module and peripheral interface circuit, wherein the pre-amplification circuit is used for the original analog exported to ray detector
It amplifies；The analog-digital converter is used to amplified analog signal being converted into digital signal；The FPGA processing module
For handling the digital signal, required monitoring signals are obtained；The peripheral interface circuit is used for the prison
It surveys signal and is output to host computer or other monitoring devices.
In one embodiment of the present of invention, the FPGA processing module includes filter module, demodulation module, FT3 agreement mould
Block and square-wave frequency modulation module, in which:
The mould that the original module signal exported from the ray detector passes through preamplifier amplification and analog-digital converter
Number is converted and is exported by filter module to demodulation module, and the signal that demodulation module demodulates is superimposed with temperature compensation signal all the way
Output is packaged by FT3 protocol module afterwards, then another way is driven by generating digital square-wave after the cumulative integral of square-wave frequency modulation module
Dynamic phase-modulator carrys out feedback canceller Faraday effect phase shift；Another way generates step signal by staircase waveform feedback module
It is superimposed upon on phase-modulator, the signal in optical path is modulated.
In one embodiment of the present of invention, the peripheral interface circuit is divided into digital interface and analog interface two parts,
Described in digital interface include serial ports and optical port, demodulation waveforms, minimum interference light intensity, maximum interference light intensity and temperature-compensating letter
It number is exported by the serial ports；Temperature compensation signal is exported with FT3 said shank by the optical port on Signal averaging after demodulation；
Interference waveform is exported by analog interface.
In one embodiment of the present of invention, the light source, the polarizer and phase-modulator are packaged together, and form integration
Optical path box.
In one embodiment of the present of invention, the light source is adjustable superradiance semiconductor laser, central wavelength
1310nm, bandwidth 40nm, 0~1mw of power adjustable range.
In one embodiment of the present of invention, the sensing fiber ring includes the wave plate of λ/4, protects circular fiber and reflecting mirror, wherein
The wave plate of λ/4 uses elliptical core fiber, and the input terminal of wave plate and the welding at 45 ° of ring retard output end, and guarantor's circular fiber uses
The reflectivity of high refractive index spin fiber, the reflecting mirror is greater than 95%.
In one embodiment of the present of invention, the serial ports is also used to receive the instruction of host computer, by adjusting feedback ladder
The switching for carrying out open loop and closed loop whether generation to phase-modulator of wave.
In one embodiment of the present of invention, the all-fiber current transformator test host further includes having the delay of extension polarization-maintaining
Ring test platform facilitates different length ring retard accessing the all-fiber current transformator monitoring system.
In one embodiment of the present of invention, the phase-modulator is lithium niobate phase modulator.
Compared with prior art, the invention has the following beneficial effects:
(1) present invention can be in real time by increasing signal processing system in all-fiber current transformator monitoring system
System digital output, temperature-compensated digital amount, minimum interference light intensity and maximum interference light intensity are output to host computer, realize to full light
The monitoring of the Proof-Of Principle and system running state of fiber current mutual inductor；
(2), the all-fiber current transformator monitoring system provided through the invention, does not need combining unit, normalized current
Mutual inductor and tester just can verify that the principle of all-fiber current transformator and the operating status of monitoring system, simplify test system
Building and operating for system, has saved testing cost；
(3) in all-fiber current transformator monitoring system of the present invention, the original module exported from the ray detector is believed
Number pass through the analog-to-digital conversion of preamplifier amplification and analog-digital converter and export by filter module to demodulation module, solves mode transfer
The signal that block demodulates is packaged by FT3 protocol module after being superimposed all the way with temperature compensation signal and is exported, and another way passes through square wave
Digital square-wave is generated after the cumulative integral of modulation module, then phase-modulator is driven to carry out feedback canceller Faraday effect phase shift；Separately
It generates step signal by staircase waveform feedback module all the way to be superimposed upon on phase-modulator, to carry out the signal in optical path
Modulation；
(4) present invention can monitor system to the all-fiber current transformator by serial ports and assign instruction, by adjusting
Feed back the switching for carrying out open loop and closed loop whether generation to phase-modulator of staircase waveform；
It (5), can easily be by the delay of different length by the subsidiary ring retard test platform in present invention test host
Ring access system is tested.
Detailed description of the invention
Fig. 1 is the schematic illustration of all-fiber current transformator monitoring system in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of all-fiber current transformator monitoring system in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of FPGA processing module in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of ring retard test platform in the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
In order to achieve the object of the present invention, as shown in Figure 1, the present invention provides a kind of all-fiber current transformator monitoring systems
System, including all-fiber current transformator test host, sensing fiber ring and host computer, in which:
The all-fiber current transformator test host includes light path system and circuit system, wherein as shown in Fig. 2, described
Light path system includes light source, ray detector, coupler and the polarizer, the light source, ray detector and the coupler
Input terminal be connected, the polarizer is connected with the output end of the coupler；The circuit system include phase-modulator and
Signal processing system, the phase-modulator are connected with the output end of the polarizer, the signal processing system and the light
Source detector is connected with the phase-modulator；
The output end of the phase-modulator is connected with ring retard, and the ring retard is connected with the sensing fiber ring；
The signal processing system is also connected with the host computer, and the monitoring signals obtained from the ray detector are defeated
The host computer is arrived out, wherein the monitoring signals include following one or more: demodulation waveforms, minimum interference light intensity, maximum
Interference light intensity and temperature compensation signal.
Wherein, the phase-modulator can be lithium niobate phase modulator.
As shown in Fig. 2, the basic principle of above-mentioned all-fiber current transformator monitoring system is as follows: the light that light source issues passes through
It is polarized after coupler by the polarizer, modulated device completes phase-modulation and is divided into the two orthogonal light in beam polarization direction, passes through
Enter sensor fibre after postponing optical fiber.In sensor fibre end, two-beam wave returns after reflecting mirror, is eventually returned to photodetection
At device and coherent superposition occurs, is converted into electric signal through photodetector.Digital output after circuit system demodulates is to upper
Position machine carries out the monitoring of real-time system state.
As shown in figure 3, the 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 described preposition
The original analog that amplifying circuit is used to export ray detector amplifies；The analog-digital converter will be for after amplifying
Analog signal be converted into digital signal；The FPGA processing module is for handling the digital signal, needed for obtaining
The monitoring signals wanted；The peripheral interface circuit is used to the monitoring signals being output to host computer or other monitoring devices.
Further, as shown in figure 3, the FPGA processing module includes filter module, demodulation module, FT3 protocol module
And square-wave frequency modulation module, in which:
The mould that the original module signal exported from the ray detector passes through preamplifier amplification and analog-digital converter
Number is converted and is exported by filter module to demodulation module, and the signal that demodulation module demodulates is superimposed with temperature compensation signal all the way
Output is packaged by FT3 protocol module afterwards, then another way is driven by generating digital square-wave after the cumulative integral of square-wave frequency modulation module
Dynamic phase-modulator carrys out feedback canceller Faraday effect phase shift；Another way generates step signal by staircase waveform feedback module
It is superimposed upon on phase-modulator, the modulation to the signal progress ± pi/2 in optical path.
Further, as shown in figure 3, the peripheral interface circuit is divided into digital interface and analog interface two parts, wherein
The digital interface includes serial ports and optical port, demodulation waveforms, minimum interference light intensity, maximum interference light intensity and temperature compensation signal
It is exported by the serial ports；Temperature compensation signal is exported with FT3 said shank by the optical port on Signal averaging after demodulation；It is dry
Waveform is related to export by analog interface.
Utilize the concrete mode of all-fiber current transformator of the present invention monitoring each signal of system monitoring are as follows:
After the original module signal exported from the ray detector is amplified by preamplifier, analog-digital converter is extracted
The maximum value and minimum value of interference signal are simultaneously exported after module is converted by serial ports；
The digital quantity of analog-digital converter output is after filter module and demodulation module, by staircase waveform feedback module according to one
Determine control algolithm and form feedback digital step signal, and analog signal is converted by digital analog converter and is added to lithium niobate modulation
On device, to offset Faraday effect phase difference.The step height value of staircase waveform and the size of current test electric current are at just simultaneously
Than, therefore using the value as the digital output of whole system to host computer.
Square-wave frequency modulation module is superimposed upon lithium niobate modulator for generating digital square-wave, the signal in optical path is carried out ±
The modulation of pi/2.
Temperature compensating signal, which passes through FT3 protocol module all the way and is superimposed to original figure amount, to be brought system accuracy for compensation temperature
Error, another way export to host computer the compensation effect for being used for real-time monitoring high/low temperature district system by serial ports.
Maximum interference signal, minimum interference signal, system digital output, temperature compensation value are successively transmitted to by serial ports
Position machine, for real-time monitoring system optical path and the operating status of circuit system.Serial ports can also receive the instruction of host computer, pass through
The switching for carrying out open loop and closed loop whether generation to system of adjustment feedback staircase waveform.
Further, the light source, the polarizer and phase-modulator can be packaged together, and form integrated optical path
Box.Wherein the light source can be adjustable superradiance semiconductor laser, and central wavelength 1310nm, bandwidth 40nm, power can
Adjust 0~1mw of range.
Further as shown in figure 3, the sensing fiber ring includes the wave plate of λ/4, protects circular fiber and reflecting mirror, wherein λ/4
Wave plate uses elliptical core fiber, and the input terminal of wave plate and the welding at 45 ° of ring retard output end, and guarantor's circular fiber is using high folding
Rate spin fiber is penetrated, the reflectivity of the reflecting mirror is greater than 95%.
Further as shown in figure 4, all-fiber current transformator test host further includes having extension polarization-maintaining ring retard
Test platform facilitates different length ring retard accessing the all-fiber current transformator monitoring system.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (7)
1. a kind of all-fiber current transformator monitors system, which is characterized in that including all-fiber current transformator test host, pass
Feel fiber optic loop and host computer, in which:
The all-fiber current transformator test host includes light path system and circuit system, wherein the light path system includes light
Source, ray detector, coupler and the polarizer, the light source, ray detector are connected with the input terminal of the coupler, institute
The polarizer is stated to be connected with the output end of the coupler；The circuit system includes phase-modulator and signal processing system, institute
It states phase-modulator to be connected with the output end of the polarizer, the signal processing system and the ray detector and the phase
Position modulator is connected；
The output end of the phase-modulator is connected with ring retard, and the ring retard is connected with the sensing fiber ring；
The signal processing system is also connected with the host computer, and the monitoring signals obtained from the ray detector are output to
The host computer, wherein the monitoring signals include following one or more: demodulation waveforms, minimum interference light intensity, maximum interference
Light intensity and temperature compensation signal；
The signal processing system includes pre-amplification circuit, analog-digital converter, FPGA processing module and peripheral interface circuit,
Described in pre-amplification circuit be used for the original analog that exports to ray detector and amplify；The analog-digital converter is used
In amplified analog signal is converted into digital signal；The FPGA processing module is used for the digital signal
Reason, obtains required monitoring signals；The peripheral interface circuit be used for by the monitoring signals be output to host computer or other
Monitoring device；
The FPGA processing module includes filter module, demodulation module, FT3 protocol module, staircase waveform feedback module and square wave
Modulation module, wherein the original module signal exported from the ray detector is amplified by preamplifier and analog-digital converter
Analog-to-digital conversion and export to demodulation module by filter module, the signal that demodulation module demodulates all the way with temperature compensation signal
Output is packaged by FT3 protocol module after superposition, another way is by generating digital square-wave after the cumulative integral of square-wave frequency modulation module, so
Driving phase-modulator carrys out feedback canceller Faraday effect phase shift afterwards；Another way generates staircase waveform by staircase waveform feedback module
Signal averaging is modulated the signal in optical path on phase-modulator；
The peripheral interface circuit is divided into digital interface and analog interface two parts, wherein the digital interface includes serial ports and light
Mouthful；
Maximum interference signal, minimum interference signal, system digital output, temperature compensation value are successively transmitted to upper by serial ports
Machine, for real-time monitoring system optical path and the operating status of circuit system；Wherein the digital quantity of analog-digital converter output is through filtering
After wave module and demodulation module, feedback digital step signal is formed according to control algolithm by staircase waveform feedback module, the number
The step height value of step signal is as system digital output；
Serial ports also receives the instruction of host computer, by adjusting feedback digital step signal generation whether to system carry out open loop
With the switching of closed loop.
2. all-fiber current transformator as described in claim 1 monitors system, which is characterized in that demodulation waveforms, minimum interference
Light intensity, maximum interference light intensity and temperature compensation signal are exported by the serial ports；Temperature-compensating is believed on Signal averaging after demodulation
It number is exported with FT3 said shank by the optical port；Interference waveform is exported by analog interface.
3. all-fiber current transformator according to claim 2 monitors system, which is characterized in that the light source, the polarizer
It is packaged together with phase-modulator, forms integrated optical path box.
4. all-fiber current transformator as claimed in claim 3 monitors system, which is characterized in that the light source is adjustable super
Radiation-emitting semi-conductor laser, central wavelength 1310nm, bandwidth 40nm, 0~1mw of power adjustable range.
5. all-fiber current transformator as described in claim 1 monitors system, which is characterized in that the sensing fiber ring includes
The wave plate of λ/4 protects circular fiber and reflecting mirror, and wherein the wave plate of λ/4 uses elliptical core fiber, and the input terminal of wave plate and ring retard export
Welding at 45 ° is held, guarantor's circular fiber uses high refractive index spin fiber, and the reflectivity of the reflecting mirror is greater than 95%.
6. all-fiber current transformator as described in claim 1 monitors system, which is characterized in that the full optical-fiber current mutual inductance
It further includes having extension polarization-maintaining ring retard test platform that device, which tests host, facilitates different length ring retard accessing all -fiber electricity
Current transformer monitors system.
7. all-fiber current transformator as described in claim 1 monitors system, which is characterized in that the phase-modulator is niobium
Sour lithium phase-modulator.
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| CN107016848A (en) * | 2017-04-03 | 2017-08-04 | 中国人民解放军理工大学 | Carry the Lightning Electromagnetic Pulse optical fiber transmission measuring syste of calibration and compensation |
| CN110940941B (en) * | 2018-04-12 | 2022-03-25 | 安徽大学 | Magnetic field sensing measurement device and method based on multi-longitudinal-mode self-mixing effect |
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| 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 |
| 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 |
| 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 |
| CN115561503B (en) * | 2022-11-11 | 2023-04-28 | 北京世维通光智能科技有限公司 | Optical fiber current transformer |
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