CN106645911A - All-fiber current transformer for open loop independent double-sampling circuit based on single light path - Google Patents
All-fiber current transformer for open loop independent double-sampling circuit based on single light path Download PDFInfo
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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
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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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
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- 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
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Abstract
The invention relates to an all-fiber current transformer for an open loop independent double-sampling circuit based on a single light path. The all-fiber current transformer comprises a phase modulation module, a photoelectric detector, a first AD switching circuit, a second AD switching circuit and a double-sampling data processing unit, wherein the phase modulation module comprises a square wave control circuit, a DA switching circuit and a phase modulator which are connected with each other in turn; the phase modulator is arranged in the single light path; the first AD switching circuit and the second AD switching circuit are both connected with the photoelectric detector and the double-sampling data processing unit; the sequence signals in the double-sampling data processing unit and the square wave control circuit are synchronous to each other. The structure adopting the single light path, double AD sampling, respective modulation and synchronous matching square wave for controlling DA switching is adopted by the invention, so that the problem of FOCT (Fiber Optical Current Transformers) dual configuration is solved and the all-fiber current transformer has the advantages of simple structure, small volume, low cost, high integrated degree, and the like.
Description
Technical field
The present invention relates to electrical equipment technical field, the independent double sampled loop of particularly a kind of open loop based on single light path
All-fiber current transformator.
Background technology
Current transformer plays a part of accurate quick measurement electric current in electrical network, is the nucleus equipment of intelligent grid.Electricity
Type current transformer is to comprehensively utilize the new transformer that modern microelectronic, computer and Development of optoelectronic technology get up, can
Solve traditional transformer complex for insulation, a difficult problem for security difference.All-fiber current transformator energy based on Faraday magnetooptical effect
It is enough that non-intervention type sensing measurement is realized to high-tension current, it is entirely different with " mutual inductance " principle, using digital control technology, with peace
Entirely, accurately it is the main development direction of high-voltage electronic current transformer, the features such as alternating current-direct current compatible measurement.
At present common all-fiber current transformator technical scheme is to realize current signal by a phase-modulator
Detection, so as to substantially increase the certainty of measurement and long-time stability of transformer.The full optical-fiber current of as shown in Figure 1 traditional is mutual
The structure chart of sensor, including light source 1, optical splitter 2, phase-modulator 3, sensing element 4, photodetector 5, A/D converter circuit 6,
The device such as digital signal processing unit 7 and DA change-over circuits 8.Wherein, phase-modulator 3, optical splitter 2, photodetector 5, AD
Change-over circuit 6, digital signal processing unit 7 and DA change-over circuits 8 form closed loop configuration.The light that light source 1 sends passes through optical splitter 2
Into phase-modulator 3, sensing element is entered by polarization maintaining optical fibre Jing after phase bias and phase compensation in phase-modulator 3
4 (Y type electro-optic phase modulators need to be connected with sensing element 4 after a polarization-maintaining coupler or beam splitter closing light), sensing
Element 4 is generally made up of quarter wave plate 41, sensing fiber ring 42 and speculum 43, polarised light reflected mirror 43 in sensing element 4
The other end of optical splitter 2 is back to after reflection along original optical path, the light for carrying phase information switchs to electricity by the detection of photodetector 5
Pressure signal, the control of digital signal processing unit 7 A/D converter circuit 6 is sampled to the output voltage of photodetector 5, sampling
Value carries out tested current value being obtained after data processing and being exported, at the same control a DA change-over circuit 8 offset phase apply to
Phase-modulator 3, completes the modulation /demodulation of a cycle.
In the practical application of intelligent grid, the configuration to electronic current mutual inductor proposes the requirement of dual.
Q/GDW_441-2010《Intelligent substation Protection Technology specification》6.3.1 regulation：" electronic mutual inductor planted agent is only by two-way
Vertical sampling system is acquired, should be using double AD system access MU per road sampling system, each MU output two-way digital sample
Value enters a set of protection device by same paths, to meet dual protection mutually completely self-contained requirement." it is directed to active electrical
Type current transformer, it is the mode of unidirectional A/D converter circuit gathered data, it is easy to realized to the double of transducing signal all the way
AD is gathered.And for all-fiber current transformator, as a result of the signal processing mode of closed loop feedback, except A/D converter circuit
Outward, also DA change-over circuits, phase-modulator only has a pair of modulator electrode external connections, can only by one piece of DA change-over circuit with
It is connected, and the DA change-over circuits of closed loop feedback are that the output of DA change-over circuits is passed through into cable with the concrete connection of phase-modulator
(ground wire and a modulated signal line) is connected respectively a two electrode tips (ground electricity of phase-modulator opening
Pole and a modulator electrode), and the current values of DA change-over circuits output are the data of Integral Processing, it is difficult to turned by increasing AD
The double AD samplings of circuit realiration are changed, that is, is difficult to the purpose to sample circuit entirety dual.Therefore, exist《Intelligent substation after
Electric protection technical specification》In the all-fiber current transformator of closed-loop fashion is defined as " often to cover in FOCT and preferably configures four guarantors
Shield sensing element, by the sampling system of four tunnel independences (single A/D systems) is acquired, per two-way sampling system data by each
Export to same MU from passage ", configuration figure as shown in Figure 2 does not show phase-modulator, optical splitter, light source and light in figure
The opticses such as electric explorer, digital signal processing unit adopts FPGA.To sum up reason, configuration mode specified in standard makes entirely
The consumption of optical fiber current mutual inductor is doubled, and meets double sampled dual requirement needs using four sets of independent full optical-fiber current mutual inductances
The expensive optics such as device so that application cost is doubled, especially phase-modulator, optical splitter, light source and photodetector will
Prepare four sets, cause many users to be difficult to receive, seriously hinder the popularization and application of all-fiber current transformator.And this match somebody with somebody
Put that scenario-frame is complicated, volume is big, it is loaded down with trivial details to install, and does not possess good implementation when in high volume equipping in transformer station.
The content of the invention
The present invention for the design of existing all-fiber current transformator dual it is not enough double in configuration application cost and
The problems such as complex structure and big volume, there is provided a kind of full optical-fiber current in the independent double sampled loop of open loop based on single light path is mutual
Sensor, using single light path, double AD samplings are simultaneously demodulated respectively, and the structure of synchronous matching square wave control DA conversions, are solved
The problem of FOCT duplicate system retrofits, has the advantages that simple structure, small volume, low cost and integrated level are high.
Technical scheme is as follows：
A kind of all-fiber current transformator in the independent double sampled loop of open loop based on single light path, it is characterised in that bag
Phase modulation module, photodetector, the first A/D converter circuit, the second A/D converter circuit and double sampled data processing unit are included,
The phase modulation module includes square wave control circuit, DA change-over circuits and the phase-modulator being sequentially connected, and the phase place is adjusted
Device processed is arranged in single light path, and first A/D converter circuit and the second A/D converter circuit are all connected with photodetector and adopt with double
Sample data processing unit, the double sampled data processing unit is synchronous with the clock signal in square wave control circuit；
The output of first A/D converter circuit and the second A/D converter circuit to photodetector carries out respectively independent sample
Two-way sampled data is input into double sampled data processing unit afterwards, the double sampled data processing unit is to two-way hits
It is calculated respective light intensity difference and then obtains two-way current value and carry out current compensation process respectively according to demodulation respectively, described pair is adopted
Sample data processing unit also sends synchronizing signal to square wave control circuit, and the square wave control circuit produces square-wave modulation signal
And be input into phase-modulator via DA change-over circuits and carry out phase-modulation.
The square wave control circuit adopts pi/2, and 0, pi/2,0 square wave is biased modulation and generates square-wave modulation signal.
The double sampled data processing unit includes the first demodulation module, the second demodulation module, the first compensating module and the
Two compensating modules, first demodulation module connects respectively the first A/D converter circuit and the first compensating module, second demodulation
Module connects respectively the second A/D converter circuit and the second compensating module, first demodulation module and the second demodulation module with side
Clock signal synchronization in ripple control circuit；
First demodulation module receives the sampled data of the first A/D converter circuit, and according to the different shape institute of modulating wave
Corresponding bias modulation interferometric demodulation obtains corresponding light intensity difference after calculating, and then obtains the first via according to Faraday magnetooptical effect
Tested current value；First compensating module carries out current compensation and exports the tested current value of the first via after compensation；Described
Two demodulation modules receive the sampled data of the second A/D converter circuit, and the bias modulation according to corresponding to the different shape of modulating wave
Interferometric demodulation obtains corresponding light intensity difference after calculating, and then obtains the tested current value in the second road according to Faraday magnetooptical effect；Institute
Stating the second compensating module carries out current compensation and exports the tested current value in the second road after compensation.
First compensating module includes the first temperature compensation module and the first linear compensating module being connected with each other, described
First temperature compensation module connects the first demodulation module, and first temperature compensation module and the first linear compensating module enter successively
The tested current value of the first via after the temperature-compensating of the tested current value of the row first via and linear compensation after output compensation；
And/or, second compensating module includes second temperature compensating module and the second linear compensation mould being connected with each other
Block, the second temperature compensating module connects the second demodulation module, the second temperature compensating module and the second linear compensation mould
Block carries out successively the tested current value in the second road after the temperature-compensating of the tested current value in the second road and linear compensation after output compensation.
The photodetector includes the first photodetector and the second photodetector, first photodetector with
First A/D converter circuit is connected, and second photodetector is connected with the second A/D converter circuit.
Also include the first modulate circuit and the second modulate circuit, the photodetector passes through the first modulate circuit and second
Modulate circuit connects respectively the first A/D converter circuit and the second A/D converter circuit and amplifies independent again after conditioning to carry out signal respectively
Sampling.
Also include the first modulate circuit and the second modulate circuit, first photodetector is connected by the first modulate circuit
It is input into again to the first A/D converter circuit after the signal amplification conditioning for connecing the first A/D converter circuit to export the first photodetector
Sampling, second photodetector connects the second A/D converter circuit so that the second photodetector is defeated by the second modulate circuit
The signal for going out amplifies to be input into again after conditioning to the second A/D converter circuit samples.
The single light path also includes light source, the first beam splitter and fibre delay line, the light source, the first beam splitter, phase
Position modulation module and fibre delay line are sequentially connected, and the phase-modulator is straight wave guide or Y waveguide, when phase-modulator is straight
During waveguide, the phase modulation module also includes polarizer, and first beam splitter connects straight wave guide by polarizer, described inclined
Shake 0 ° of welding straight wave guide of device；When phase-modulator is Y waveguide, the phase modulation module also includes the second beam splitter, described
One pin of the first beam splitter connects the combining end of Y waveguide, and 0 ° of a branch end of the Y waveguide is welded to the second beam splitter
A pin, 0 ° or 90 ° of another branch end of the Y waveguide is welded to another pin of the second beam splitter, described
The 3rd pin connection fibre delay line of two beam splitters.
The technique effect of the present invention is as follows：
The all-fiber current transformator in the independent double sampled loop of the open loop based on single light path that the present invention is provided, by two
Output of the individual A/D converter circuit to photodetector carries out after independent sample, by double sampled data processing unit calculating being demodulated respectively
Obtain respective light intensity difference and then two-way current value is calculated according to Faraday magnetooptical effect and is carried out at current compensation
Reason, double sampled data processing unit also sends synchronizing signal to square wave control circuit, produces square wave by square wave control circuit and adjusts
Signal processed is simultaneously input into phase-modulator via DA change-over circuits and carries out phase-modulation.The all-fiber current transformator of the present invention is adopted
With single light path, double AD samplings are simultaneously demodulated respectively, and the structure of synchronous matching square wave control DA conversions, and output two-way is only mutually
Vertical, non-interfering transformer data, realize in an integrated fashion the function of two existing independent FOCT products simultaneously, obtain
Two-way measurement current data output realizes duplicate system retrofit requirement, using when FOCT products of the present invention by double sampled data
The two-way FOCT data cube computation MU combining units of processing unit output, the all-fiber current transformator of two sets of present invention is exportable
Four road FOCT data, and then connect two MU combining units, as long as therefore being using the FOCT products of two sets of present invention in the application
Can meet the dual requirement in intelligent substation Protection Technology specification, it is to avoid prior art need four it is independent
FOCT products configure big complicated, volume and high cost caused by installing together the problems such as, reduces and uses phase-modulator, light splitting
The opticses such as device, light source and photodetector, therefore the cost of optics is saved, and can solve the problem that FOCT duplicate system retrofits
Problem, when all the way A/D converter circuit breaks down, on not affecting completely all the way in addition, realize independent double sampled work(
Can, the requirement of associated specifications is disclosure satisfy that, have the advantages that simple structure, small volume, low cost and integrated level are high, becoming
With good implementation when in high volume equipping in power station.
Square wave control circuit is set and adopts pi/2,0, pi/2,0 square wave is biased modulation and generates square-wave modulation signal, should
The simple structure of the square wave control circuit of structure is easy to make, and working method adopts square wave bias modulation strong antijamming capability.It is excellent
Choosing arranges double sampled data processing unit includes the first demodulation module, the second demodulation module, the first compensating module and the second compensation
Module, each part division of labor is clear and definite, collaborative work, improves efficiency, and modularization is built framework and detects easy to maintenance.
The first temperature compensation module and the first linear benefit that first compensating module includes being connected with each other further preferably are set
Module is repaid, the second compensating module includes second temperature compensating module and the second linear compensation module being connected with each other, each corresponding
Temperature compensation module can realize current value to variation error amendment of the current value as open loop demodulating data under high/low temperature
Temperature-compensating, each corresponding linear compensation module can carry out the linear compensation of current value, it is ensured that transformer is in protective current
Under disclosure satisfy that the requirement of combination misalignment, improve the certainty of measurement of transformer.
Be preferably provided with the first modulate circuit and the second modulate circuit, the voltage signal of photodetector output is carried out as
The conditioning such as filtering and amplification, it is ensured that signal quality, the high-quality signal after conditioning is again respectively by the first A/D converter circuit and second
A/D converter circuit is sampled, and also causes the degree of accuracy that the sample quality and subsequent demodulation calculating of sampling is processed to be guaranteed, and is entered
One step improves transformer operating efficiency and certainty of measurement.
Description of the drawings
Fig. 1 is the structural representation of existing all-fiber current transformator.
Fig. 2 is the configuration structure that existing all-fiber current transformator specifies in a standard.
Fig. 3 is that the present invention is shown based on the structure of the independent all-fiber current transformator in double sampled loop of open loop of single light path
It is intended to.
Fig. 4 is square wave control circuit fundamental diagram.
Fig. 5 is the present invention based on a kind of excellent of the independent all-fiber current transformator in double sampled loop of open loop of single light path
Select structural representation.
Fig. 6 is second of the present invention based on the independent all-fiber current transformator in double sampled loop of open loop of single light path
Preferred structure schematic diagram.
Fig. 7 be the present invention based on the independent all-fiber current transformator in double sampled loop of open loop of single light path the third
Preferred structure schematic diagram.
Each label lists as follows in figure：
1- light sources；2- optical splitters；3- phase-modulators；31-Y waveguides；4- sensing elements；41-1/4 wave plates；
42- sensing fiber rings；43- speculums；5- photodetectors；6-AD change-over circuits；7- digital signal processing units；8-
DA change-over circuits；9- fibre delay lines；10- polarizers.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be described.
The present invention relates to a kind of all-fiber current transformator in the independent double sampled loop of open loop based on single light path, is used for
Current measurement in power system, generally includes light path part and circuit part (abbreviation light path and circuit), as shown in figure 3, light
Road generally includes light source, light-splitting device (can adopt beam splitter as shown in Figure 3, it would however also be possible to employ coupler, circulator etc.), phase
Position modulator, fibre delay line 9 and sensing element 4 and photodetector, sensing element 4 is generally by quarter wave plate 41, sensor fibre
Ring 42 and speculum 43 are constituted.Wherein, the phase-modulator being arranged in single light path belongs to the part of phase modulation module, phase
Position modulation module includes square wave control circuit, DA change-over circuits and the phase-modulator being sequentially connected.For circuit：Including first
Square wave control circuit in A/D converter circuit, the second A/D converter circuit, double sampled data processing unit and phase modulation module
With DA change-over circuits, the first A/D converter circuit and the second A/D converter circuit are all connected with photodetector and double sampled data processing list
Unit, double sampled data processing unit is synchronous with the clock signal in square wave control circuit.First A/D converter circuit and the 2nd AD turn
Changing output of the circuit to photodetector carries out that two-way sampled data is input into double sampled data after independent sample respectively
Reason unit, double sampled data processing unit demodulates respectively to two-way sampled data and is calculated respective light intensity difference and then obtains two-way
Current value as open loop demodulation process data simultaneously carries out respectively current compensation process, and double sampled data processing unit will also be synchronous
Signal is sent to square wave control circuit, and square wave control circuit produces square-wave modulation signal and is input into phase place via DA change-over circuits
Modulator carries out phase-modulation；Double sampled data processing unit, can be defeated by the tested current value output after the two-way compensation for obtaining
Go out to combining unit MU, so, double sampled data processing unit exports two-way FOCT data.The present invention is opened based on single light path
The circuit of the independent all-fiber current transformator in double sampled loop of ring has ad hoc structure, using single light path, including an AD
Change-over circuit and the second A/D converter circuit, the double sampled data processing unit also with particular job, double AD samplings are simultaneously solved respectively
Adjust, and the structure of synchronous matching square wave control DA conversions, FOCT duplicate system retrofits are solved the problems, such as, with simple structure, body
The advantages of little, low cost of product and high integrated level.
Fig. 5 is circuit of the present invention based on the independent all-fiber current transformator in double sampled loop of open loop of single light path
A kind of preferred structure schematic diagram, in the embodiment, double sampled data processing unit includes the first demodulation module, the second solution mode transfer
Block, the first compensating module and the second compensating module, the first demodulation module connects respectively the first A/D converter circuit and the first compensation mould
Block, the second demodulation module connects respectively the second A/D converter circuit and the second compensating module, the first demodulation module and the second solution mode transfer
Block is synchronous with the clock signal in square wave control circuit；The fundamental diagram of square wave control circuit is as shown in figure 4, bias modulation
Using pi/2,0, pi/2,0 square-wave frequency modulation mode, or perhaps pi/2 is adopted, and 0, pi/2,0 square wave is biased modulation generation side
Ripple modulated signal, the biasing Φ b of a time period τ are pi/2, and the biasing Φ b of following time period τ are 0, when wherein AD1 samples
Sequence and AD2 sampling time sequences are the first A/D converter circuit sampling time sequence and the second A/D converter circuit sampling time sequence.First AD conversion
Circuit and the second A/D converter circuit are sampled respectively to the output voltage of photodetector, and the first demodulation module receives an AD
The sampled data of change-over circuit, and obtain phase after the bias modulation interferometric demodulation according to corresponding to the different shape of modulating wave is calculated
The light intensity difference answered, and then the tested current value of the first via is obtained according to Faraday magnetooptical effect；First compensating module carries out electric current benefit
Repay and export the tested current value of the first via after compensation；Second demodulation module receives the sampled data of the second A/D converter circuit, and
Bias modulation interferometric demodulation according to corresponding to the different shape of modulating wave obtains corresponding light intensity difference after calculating, and then according to method
Magneto-optic effect is drawn to obtain the tested current value in the second road；Second compensating module carries out current compensation and exports the second tunnel after compensation
Tested current value.
Therefore the operation principle of the first demodulation module and the second demodulation module is identical, for no other reason than that what is received is each self-corresponding
The difference of the sampled data of A/D converter circuit so that each demodulating calculated light intensity difference can differ, so draw it is each
The tested current value on road is variant, certainly may be nuance.Carried out in detail with the job step of the first demodulation module below
Thin description：
Modulation biasing respectively pi/2 of first demodulation module according to corresponding to visible 0,1 state of the form of modulating wave ,-pi/2,
Had according to optical fiber current mutual inductor interference formula：
Wherein, P0, P1For 0,1 state interference light intensity, P is input light intensity, φIFor the phase shift that Faraday effect is produced.
Light intensity difference Δ P=P1-P0=2Psin (φI)≈2PφI (3)
Had according to Faraday magnetooptical effect：
φI=nVI (4)
Wherein, n is the optical fiber number of turn (the optical fiber number of turn of the sensing fiber ring 42 in sensing element 4), and V is the Verdet of optical fiber
Constant, I is the current value for wearing sensing fiber ring, substitutes into formula (3) and obtains
ΔP≈2Pn VI (5)
Then
WhereinFor the constant multiplier of all-fiber current transformator.
That is, the first demodulation module is demodulated calculating process and obtains current value I, such as I1.In the same manner, the second demodulation module
According to the sampled data that the second A/D converter circuit sends, with reference to above-mentioned formula (1)-(6), demodulation calculating is processed and obtains current value
I, such as I2.
First compensating module the current value that the first demodulation module is obtained is carried out current compensation and export compensation after first
The tested current value in road, it is further preferred that the first compensating module includes the first temperature compensation module and the First Line being connected with each other
Property compensating module, the first temperature compensation module connects the first demodulation module, the first temperature compensation module and the first linear compensation mould
Block carries out successively the tested current value of the first via after the temperature-compensating of the tested current value of the first via and linear compensation after output compensation.
Second compensating module carries out current compensation to the current value that the second demodulation module is obtained and exports the tested electricity in the second road after compensation
Flow valuve, it is further preferred that the second compensating module includes second temperature compensating module and the second linear compensation mould being connected with each other
Block, second temperature compensating module connects the second demodulation module, and second temperature compensating module and the second linear compensation module are entered successively
The tested current value in the second road after the temperature-compensating of the tested current value in the road of row second and linear compensation after output compensation.First compensation
Module is identical with the operation principle of the second compensating module, is described in detail with the job step of the first compensating module below：
First temperature compensation module carries out temperature compensation：
In formula (6), parameter Verdet constant V, input light intensity P may change under high/low temperature, for height
Preferable measurement performance is obtained under low temperature, all-fiber current transformator of the present invention can be placed in high-low temperature chamber, by height
Its temperature model is set up in temperature test, then carries out temperature adjustmemt by software, that is, sets up the model K that K changes with temperature T
(T) trip temperature of, going forward side by side is compensated.
That is IT=K (T) Δ P (7)
Wherein ITCurrent value after to carry out temperature-compensating.
First linear compensating module carries out linear compensation method：
Known by formula (3)～(5), be sine relation between interference light intensity and electric current I, when electric current I is less, with preferable
The linearity.When electric current I is incrementally increased, the linearity is deteriorated, and is the certainty of measurement of raising system, then need to carry out linearity benefit
Repay.
Because the parameters such as n, V are, it is known that I is the current value after temperature-compensating, by formula (6)：
OrderObtained by formula (3)
φI=arcsin (X) (9)
Formula (9) is omitted into 3 rank above components by Taylor series expansion to obtain：
Due to φI=nVIn, I hereinnBe the current value after linear compensation, i.e., final output current value.
Then
By X=nVITSubstitution formula (11)
Output current can be carried out by formula (12), as the final output of all-fiber current transformator after linear compensation, protecting
Card transformer disclosure satisfy that the requirement of combination misalignment under protective current, improve the certainty of measurement of transformer.In the same manner, the second compensation
The work of second temperature compensating module and second linear compensation module of the module inside, with reference to above-mentioned formula, to current value
Temperature-compensating and linear compensation are carried out successively, obtain the tested current value after another road compensation as all-fiber current transformator
Final output.Tested current value output after two-way compensation, ensures that transformer disclosure satisfy that combination misalignment under protective current
Requirement, improve transformer certainty of measurement.The all-fiber current transformator of the present invention, requires according to user, according to regulation
Sample rate, unified FOCT Frame of the output comprising two channel datas, finally realize duplicate system retrofit, double AD samplings should
With demand, the current data of output can be used for the current value of high frequency measurement.
The phase-modulator that embodiment illustrated in fig. 5 is adopted for straight wave guide, now phase modulation module except including straight wave guide,
Outside DA change-over circuits and square wave control circuit, also including polarizer 10, light source in the single light path of all-fiber current transformator,
Beam splitter, polarizer 10, straight wave guide and fibre delay line 9 are sequentially connected, the 0 ° of welding straight wave guide when making of polarizer 10.Except upper
Enforcement exception is stated, the phase-modulator of the present invention can also be worked using Y waveguide, and embodiment as shown in Figure 6 works as phase-modulator
For Y waveguide when, phase modulation module except including in addition to Y waveguide, DA change-over circuits and square wave control circuit, also including the second beam splitting
Device, the light source, the first beam splitter, Y waveguide 31, the second beam splitter and optical fiber delay in the single light path of all-fiber current transformator
Line 9 is sequentially connected, when making, the combining end of the pin connection Y waveguide 31 of the first beam splitter, and one point of Y waveguide 31
0 ° of terminal is welded to a pin of the second beam splitter, and 0 ° or 90 ° of another branch end of Y waveguide 31 is welded to the second beam splitter
Another pin, the second beam splitter the 3rd pin connection fibre delay line 9.
For all-fiber current transformator of the present invention based on the independent double sampled loop of open loop of single light path, can be with excellent
Choosing arranges the first modulate circuit and the second modulate circuit, second preferred structure as shown in Figure 6, also including the first modulate circuit
With the second modulate circuit, photodetector passes through the first modulate circuit and the second modulate circuit connects respectively the first A/D converter circuit
With the second A/D converter circuit to carry out the conditioning such as signal amplification respectively after independent sample again.First modulate circuit and the second conditioning electricity
Road can carry out such as filtering and amplifying conditioning to the voltage signal of photodetector output, it is ensured that signal quality, after conditioning
High-quality signal sampled by the first A/D converter circuit and the second A/D converter circuit respectively again, also cause the sample matter of sampling
Amount and subsequent demodulation calculate the degree of accuracy for processing and are guaranteed, and further improve transformer operating efficiency and certainty of measurement.
Fig. 7 be the present invention based on the independent all-fiber current transformator in double sampled loop of open loop of single light path the third
Preferred structure schematic diagram.Photodetector in light path described in the embodiment includes the first photodetector and the second photodetection
Device, the first photodetector is connected with the first A/D converter circuit, and the second photodetector is connected with the second A/D converter circuit.The reality
Applying the beam splitter in example can adopt 3*1 beam splitters, 3*2 beam splitters or 3*3 beam splitters, naturally it is also possible to using two 2*2 beam splitting
Combination of device etc..When all-fiber current transformator is using two photodetectors and two modulate circuits, i.e., including first
Photodetector, the second photodetector, the first modulate circuit and the second modulate circuit, now, the first photodetector passes through
After first modulate circuit connects the first A/D converter circuit and is amplified and filtered etc. and to nurse one's health with the signal that export the first photodetector
Be input into again to the first A/D converter circuit sampling, the second photodetector by the second modulate circuit connect the second A/D converter circuit with
It is input into again to the sampling of the second A/D converter circuit after the conditioning such as the signal amplification that the second photodetector is exported and filtering.
All-fiber current transformator of the present invention based on the independent double sampled loop of open loop of single light path, for current FOCT
The deficiency of dual design, proposes a kind of single light path, double AD samplings and demodulates respectively, and synchronous matching square wave control DA turns
The structure changed, solves the problems, such as FOCT duplicate system retrofits, and the program shares a set of light path, saves a large amount of opticses, can be integrated
A set of signal processing circuit board is shared, output two-way is independent mutually, non-interfering transformer data, the as tested electric current of two-way
Value, realizes in an integrated fashion the function of two independent FOCT products simultaneously.The solution of the present invention possesses simple structure, volume
The advantages of little, low cost, high integrated level.
It should be pointed out that the above specific embodiment can make those skilled in the art that the present invention is more fully understood
Create, but limit the invention never in any form.Therefore, although this specification is created referring to the drawings with embodiment to the present invention
Make and have been carried out detailed description, it will be understood by those skilled in the art, however, that still can modify to the invention
Or equivalent, in a word, all technical schemes and its improvement without departing from the spirit and scope of the invention, it all should contain
Cover in the middle of the protection domain of the invention patent.
Claims (8)
1. the all-fiber current transformator in the independent double sampled loop of a kind of open loop based on single light path, it is characterised in that include
Phase modulation module, photodetector, the first A/D converter circuit, the second A/D converter circuit and double sampled data processing unit, institute
State square wave control circuit, DA change-over circuits and phase-modulator that phase modulation module includes being sequentially connected, the phase-modulation
Device is arranged in single light path, and first A/D converter circuit and the second A/D converter circuit are all connected with photodetector and double sampled
Data processing unit, the double sampled data processing unit is synchronous with the clock signal in square wave control circuit；
The output of first A/D converter circuit and the second A/D converter circuit to photodetector is carried out respectively will after independent sample
Two-way sampled data is input into double sampled data processing unit, and the double sampled data processing unit is to two-way sampled data point
Respective light intensity difference Xie Tiao be calculated and then obtained two-way current value and carried out current compensation process respectively, the double sampled number
Also synchronizing signal is sent to square wave control circuit according to processing unit, the square wave control circuit produces square-wave modulation signal and Jing
Being input into phase-modulator by DA change-over circuits carries out phase-modulation.
2. all-fiber current transformator according to claim 1, it is characterised in that the square wave control circuit adopts pi/2,
0, pi/2,0 square wave is biased modulation and generates square-wave modulation signal.
3. all-fiber current transformator according to claim 2, it is characterised in that the double sampled data processing unit bag
The first demodulation module, the second demodulation module, the first compensating module and the second compensating module are included, first demodulation module connects respectively
The first A/D converter circuit and the first compensating module are connect, second demodulation module connects respectively the second A/D converter circuit and second and mends
Module is repaid, first demodulation module and the second demodulation module are synchronous with the clock signal in square wave control circuit；
First demodulation module receives the sampled data of the first A/D converter circuit, and according to corresponding to the different shape of modulating wave
Bias modulation interferometric demodulation calculate after obtain corresponding light intensity difference, and then it is tested to obtain the first via according to Faraday magnetooptical effect
Current value；First compensating module carries out current compensation and exports the tested current value of the first via after compensation；Second solution
Mode transfer block receives the sampled data of the second A/D converter circuit, and the bias modulation according to corresponding to the different shape of modulating wave is interfered
Demodulation obtains corresponding light intensity difference after calculating, and then obtains the tested current value in the second road according to Faraday magnetooptical effect；Described
Two compensating modules carry out current compensation and export the tested current value in the second road after compensation.
4. all-fiber current transformator according to claim 3, it is characterised in that first compensating module includes mutual
First temperature compensation module and the first linear compensating module of connection, the first temperature compensation module connection first solves mode transfer
Block, first temperature compensation module and the first linear compensating module carry out successively the tested current value of the first via temperature-compensating and
The tested current value of the first via after linear compensation after output compensation；
And/or, second compensating module includes second temperature compensating module and the second linear compensation module being connected with each other, institute
State second temperature compensating module and connect the second demodulation module, the second temperature compensating module and the second linear compensation module are successively
Carry out the tested current value in the second road temperature-compensating and linear compensation after output compensation after the tested current value in the second road.
5. all-fiber current transformator according to claim 1, it is characterised in that the photodetector includes the first light
Electric explorer and the second photodetector, first photodetector is connected with the first A/D converter circuit, second photoelectricity
Detector is connected with the second A/D converter circuit.
6. all-fiber current transformator according to claim 1, it is characterised in that also including the first modulate circuit and second
Modulate circuit, the photodetector by the first modulate circuit and the second modulate circuit connect respectively the first A/D converter circuit and
Second A/D converter circuit amplifies independent sample again after conditioning to carry out signal respectively.
7. all-fiber current transformator according to claim 5, it is characterised in that also including the first modulate circuit and second
Modulate circuit, first photodetector connects the first A/D converter circuit with by the first photodetection by the first modulate circuit
The signal of device output amplifies to be input into again after conditioning to the first A/D converter circuit samples, and second photodetector is adjusted by second
It is input into again to the 2nd AD after the signal amplification conditioning that reason circuit connects the second A/D converter circuit to export the second photodetector
Change-over circuit is sampled.
8. all-fiber current transformator according to claim 1, it is characterised in that the single light path also include light source,
First beam splitter and fibre delay line, the light source, the first beam splitter, phase modulation module and fibre delay line are sequentially connected,
The phase-modulator is straight wave guide or Y waveguide, and when phase-modulator is straight wave guide, the phase modulation module also includes inclined
Shake device, and first beam splitter connects straight wave guide, 0 ° of welding straight wave guide of the polarizer by polarizer；When phase-modulator is
During Y waveguide, the phase modulation module also includes the second beam splitter, the pin connection Y waveguide of first beam splitter
Combining end, 0 ° of a branch end of the Y waveguide is welded to a pin of the second beam splitter, another point of the Y waveguide
0 ° or 90 ° of terminal is welded to another pin of the second beam splitter, and the 3rd pin connection optical fiber of second beam splitter prolongs
Slow line.
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| CN107328977A (en) * | 2017-07-07 | 2017-11-07 | 刘勇 | The double sampled all-fiber current transformator of patrilineal line of descent with only one son in each generation sense and its method of work |
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| CN107422166B (en) * | 2017-08-07 | 2020-02-11 | 北京航天时代光电科技有限公司 | Modulation and demodulation method for suppressing light power fluctuation for optical fiber current transformer |
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| CN107991641A (en) * | 2017-10-27 | 2018-05-04 | 中国电力科学研究院有限公司 | It is a kind of based on optical fiber current mutual inductor independently double sampled sampling method for detecting abnormality and system |
| CN108680887A (en) * | 2018-06-11 | 2018-10-19 | 中国电力科学研究院有限公司 | The method and system of all-fiber current transformator accuracy under a kind of low temperature light intensity abnormal failure |
| CN110763907A (en) * | 2018-07-25 | 2020-02-07 | 南京南瑞继保电气有限公司 | Sampling system |
| CN109901382A (en) * | 2019-03-15 | 2019-06-18 | 爱士惟新能源技术(江苏)有限公司 | A kind of rule sampling PWM optimization method of numerical control system |
| EP3798643A1 (en) * | 2019-09-25 | 2021-03-31 | Lumiker Aplicaciones Tecnologicas S.L. | Optical fiber-based current measuring equipment for measuring the current circulating through a conductor and associated method |
| US11789043B2 (en) | 2019-09-25 | 2023-10-17 | Lumiker Aplicaciones Tecnológicas S.L. | Method and apparatus for measuring the current circulating through a conductor |
| CN110988432A (en) * | 2019-12-13 | 2020-04-10 | 东南大学 | All-fiber current transformer open-loop demodulation and half-wave voltage tracking method |
| CN110988432B (en) * | 2019-12-13 | 2021-09-28 | 东南大学 | All-fiber current transformer open-loop demodulation and half-wave voltage tracking method |
| CN114325030A (en) * | 2021-09-30 | 2022-04-12 | 南京曦光信息科技研究院有限公司 | Double square wave modulation open-loop demodulation method based on optical current transformer |
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