CN109270318A - A kind of the current transducer signal Transmission system and transmission method of Wide measuring range - Google Patents
A kind of the current transducer signal Transmission system and transmission method of Wide measuring range Download PDFInfo
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- CN109270318A CN109270318A CN201811179206.XA CN201811179206A CN109270318A CN 109270318 A CN109270318 A CN 109270318A CN 201811179206 A CN201811179206 A CN 201811179206A CN 109270318 A CN109270318 A CN 109270318A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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Abstract
A kind of the current transducer signal Transmission system and transmission method of Wide measuring range, belong to electrical engineering fields of measurement.Including the high-pressure side connected by optical fiber and low-pressure side, it is characterized by: the output end of current transformer connects the input terminal of section signal judgement module and signal conditioning module simultaneously, the input terminal of the output end connection measured signal drive module of signal conditioning module, the output end of block information judgment module is separately connected the input terminal of block information drive module and variable restriction resistive module, and variable restriction resistive module changes the resistance value exported to measured signal drive module according to the unlike signal that block information judgment module exports.In the current transducer signal Transmission system and transmission method of this Wide measuring range, by the way that block information judgment module is arranged, the block information of current transformer output signal is judged, and change waveforms amplitude when measured signal transmission by block information, improve measured signal signal-to-noise ratio in the lesser situation of amplitude.
Description
Technical field
A kind of the current transducer signal Transmission system and transmission method of Wide measuring range belong to electrical engineering measurement neck
Domain.
Background technique
In the prior art, current transformer primarily serves the effect of measurement and protection in application process, wherein protecting
Current Transformer uses air core coil as on high-tension side senser element more at present, and Verification of Measuring Current Transformer uses low function more
Rate current transformer (Low Power Current Transformer, referred to as LPCT) is used as on high-tension side senser element, by
In LPCT have very wide linearity range, such as current LPCT in the steady state, within the scope of 20 times of rated current, ratio
Error and phase error can reach 0.2 grade of requirement, therefore LPCT can shoulder the dual function of metering and protection completely
Can, in view of the reason, and consider cost factor, electronic current mutual inductor product on the market is in high-pressure-side sensing head at present
Selection on, many enterprises have used the scheme of single LPCT.
And in terms of on high-tension side signal adapter, mainly there are intensity modulation formula, (V/F) change type and modulus (A/ at present
D) change type, the frequency band that wherein voltage-frequency conversion and analog-to-digital conversion can be transmitted is limited, and for protection integration,
Use intensity modulation formula that will can directly represent bus without carrying out A/D sampling in high-pressure side as high-side signal conversion plan
The analog voltage signal driving LED of electric current shines, and indicates bus current signal with continuous LED luminous intensity, at present the frequency of LED
Band can achieve 100MHz, therefore this mode can easily realize the signal transmission of 5MHz frequency bandwidth, this is to traveling-wave protection
It is very favorable.It can be seen that using a LPCT simultaneously as measurement and protection device, and it is real in the way of intensity modulation
The transmission of existing signal, makes the design for carrying out electronic current mutual inductor in this way, than current in cost and transmission band
Market product has a clear superiority.
However, LPCT is defeated using sample resistance for having the disadvantage that by single LPCT and in the way of using intensity modulation
The voltage signal of reflection bus current its range out is limited by high-pressure side circuit power voltage, for example, if high-pressure side
Circuit use+5V power supply, then for the measurement of 5P20 precision protection integrative current transformer, when rated current is 300A
When, for protection multiple is 20, then mean that the current signal of 0 ~ 6000A range will correspond to the voltage of 0 ~ 5V range
Signal reflected, if design circuit with 5V peak-to-peak value (V pp ) dynamic range voltage indicate the electric current of 6000A, then for
It needs to indicate using the voltage of 250mV dynamic range for the rated current of 300A, and 15A electric current (5% rated current) is just
It to be indicated using the dynamic range of 12.5mV.
In general, current transformer at runtime, since the probability that failure occurs is minimum, most times
Use state in measurement, and it can be seen from the above, being measured when using the signal of such small dynamic range to 15A electric current
When, since its noise is relatively low, thus it is relatively low to the measurement accuracy of the signal, it is seen then that for using a LPCT to realize protection
It measures for integrated current transformer, guarantee big measurement range and guarantees a higher precision especially in the range
It is the measurement accuracy of low current, the two is difficult to take into account.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide a kind of by setting block information
Judgment module judges the block information of current transformer output signal, and changes measured signal by block information and pass
Waveforms amplitude when defeated improves the current transformer of measured signal Wide measuring range of signal-to-noise ratio in the lesser situation of amplitude
Signal transmission system and transmission method.
The technical solution adopted by the present invention to solve the technical problems is: the current transducer signal of the Wide measuring range passes
Defeated system, including the high-pressure side connected by optical fiber and low-pressure side, current transformer is connected to high-pressure side, by optical fiber that electric current is mutual
The signal of sensor output is sent to low-pressure side by high-pressure side, it is characterised in that: further includes block information judgment module and signal tune
Module is managed, the output end of current transformer connects the input terminal of rectification filtering module and signal conditioning module, rectifying and wave-filtering simultaneously
The input terminal of the output end connection section signal judgement module of module, the output end connection measured signal driving of signal conditioning module
The input terminal of module, measured signal drive module drive second in it to shine according to the voltage signal that signal conditioning module exports
Diode issues the optical signal of different capacity, and optical signal connects low-pressure side measured signal photoelectricity conversion module by the second optical fiber
Input terminal；
The output end of block information judgment module is separately connected the input of block information drive module and variable restriction resistive module
End, block information drive module drive the first light emitting diode in it to send out according to the signal that block information judgment module exports
The optical signal of multistage different capacity out, optical signal connect the input of low-pressure side wayside signaling photoelectric conversion module by the first optical fiber
End；Variable restriction resistive module changes according to the unlike signal that block information judgment module exports to measured signal drive module
The resistance value of output；
In low-pressure side, the output end of wayside signaling photoelectric conversion module is also connected with the input terminal of measured signal photoelectricity conversion module.
Preferably, the signal conditioning module includes the reference voltage generation module for generating reference signal, and
The signal mixing module that reference signal is mixed with the signal that current transformer exports.
Preferably, it is additionally provided between the signal conditioning module and measured signal drive module for by signal tune
The phase shift block that the output signal of reason module is delayed.
Preferably, it in the measured signal drive module, is provided with for driving the second light-emitting diodes plumber
Make linear light emission drive circuit, linear light emission drive circuit by signal conditioning module voltage and the variable restriction resistive mode
The resistance of block output obtains.
Preferably, the pressure stabilizing numerical value that the block information judgment module includes more voltage-stabiliser tubes incremented by successively, pressure stabilizing
Pipe is connected respectively forms corresponding loop of voltage regulation after corresponding resistance, and the output end of pressure stabilizing numerical value is same after a plurality of loop of voltage regulation is in parallel
When access the input terminal of analog adder, the output end of analog adder connects the block information drive module；Voltage-stabiliser tube
Output end of pressure-stabilizing is separately connected the different input terminals of variable restriction resistive module.
Preferably, the variable restriction resistive module is digital regulation resistance, in the output end and digital current potential of voltage-stabiliser tube
Divider resistance is additionally provided between the input terminal of device.
A kind of transmission method that the current transducer signal Transmission system using Wide measuring range is realized, it is characterised in that:
Include the following steps:
The output signal of current transformer is divided into multiple electric current sections according to the range of current transformer by step a；
Step b, current transformer output voltage signal, and area is performed simultaneously according to the voltage signal that current transformer exports respectively
Between information determine process and measured signal conditioning process, by execute block information determine process obtain current transformer output letter
Number block information, by execute measured signal improve process, obtain current transformer output signal to be transmitted；
Step c, it is respectively that the block information of current transformer output signal and electric current is mutual by the first optical fiber and the second optical fiber
The signal to be transmitted of sensor output is sent to secondary side；
Step d, wayside signaling photoelectric conversion module is converted to block information by the optical signal that optical fiber is sent into, and section is believed
Breath is sent to measured signal photoelectricity conversion module；
Step e, measured signal photoelectricity conversion module is converted to measured signal by the optical signal that optical fiber is sent into, then according to area
Between signal photoelectric conversion module be sent into block information the measured signal being converted to is handled, reduction be sent into measured signal
Measured signal when drive module；
Step f, measured signal photoelectricity conversion module carry out Signal separator, final reduction current mutual inductor output to measured signal
Signal to be transmitted.
Preferably, the block information determines that process includes the following steps:
The voltage signal of current transformer output is sent into rectification filtering module and carries out rectifying and wave-filtering by step b-1；
Step b-2, block information judgment module determine section locating for the voltage signal of current transformer output and respectively to sections
Information drive module and variable restriction resistive module export corresponding signal；
Step b-3, block information drive module pass through the current limliting electricity in it according to the output voltage of block information judgment module
Resistance forms constant-current source, drives the first LED operation, issues the optical signal for the power that matches with block information；
The output signal that variable restriction resistive module is issued according to block information judgment module is exported to measured signal drive module
Corresponding resistance value, as the current-limiting resistance for forming linear light emission drive circuit in measured signal drive module.
Preferably, measured signal conditioning process includes the following steps:
The voltage signal of step b ' -1, current transformer output is sent into signal conditioning module, passes through letter in signal conditioning module
Number mixing module is superimposed reference voltage, forms mixed signal；
Step b ' -2, mixed signal, which enters, carries out phase shift in phase shift block；
The measured signal of step b ' -3, phase shift block output is sent into measured signal drive module as driving power, with variable limit
Leakage resistance module input tissue signal forms the linear light emission drive circuit of the second LED operation of driving.
Compared with prior art, the present invention has the beneficial effects that
1, in the current transducer signal Transmission system and transmission method of this Wide measuring range, judged by setting block information
Module judges the block information of current transformer output signal and controls variable restriction resistive module according to Current Mutual Inductance
The size of device signal and export different resistance values, especially in the lesser situation of amplitude of current transformer output, driving the
The numerical value of the driving current dynamic range of two lumination of light emitting diode becomes larger, so that the dynamic model of the corresponding optical signal of measured signal
It encloses and becomes larger, therefore improve signal-to-noise ratio of the measured signal in the lesser situation of amplitude, increase the transmission precision of current transformer
Greatly.
2, the electronic current mutual inductor for realizing measurement and protection simultaneously to single sensing head, before guaranteeing wide-measuring range
It puts, improves the measurement accuracy to low current, it is achieved that the high-acruracy survey of full-scale current range.
3, judge to survey module to the detection of electric current, variable restriction resistive module to resistance by block information in this application
Change using CPU complete, it is above adjustment using circuit electrical characteristic with combinational logic circuit complete, real-time height,
High reliablity, it is at low cost.
4, the introducing of phase shift block is so that measured signal before really driving LED shines, is suitble to it to shine and uses
The size adjustment of current-limiting resistance has been fulfiled ahead of schedule, therefore there is no can be to letter to be measured due to adjustment current-limiting resistance for whole system
Number introduce error the problem of.
Detailed description of the invention
Fig. 1 is the current transducer signal Transmission system functional-block diagram of Wide measuring range.
Fig. 2 is the current transducer signal transmission method flow chart of Wide measuring range.
Specific embodiment
Fig. 1 ~ 2 are highly preferred embodiment of the present invention, and 1 ~ 2 the present invention will be further described with reference to the accompanying drawing.
As shown in Figure 1, a kind of current transducer signal Transmission system of Wide measuring range, including high-pressure side and low-pressure side,
It is connected between high-pressure side and low-pressure side by optical fiber, wherein high-pressure side includes low power current transformer (LPCT), rectifying and wave-filtering
Module, signal conditioning module, block information judgment module, phase shift block, block information judgment module, variable restriction resistive module
And measured signal drive module, low-pressure side include electric current section photoelectric conversion module and measured signal photoelectricity conversion module.
In high-pressure side, the output end of LPCT is separately connected the input terminal and signal conditioning module of rectification filtering module
Input terminal, rectification filtering module output end connection section signal judgement module input terminal, block information judgment module it is defeated
Outlet connects the input terminal of block information drive module and variable restriction resistive module simultaneously, block information drive module it is defeated
Outlet drives a lumination of light emitting diode, which is denoted as the first light emitting diode, for exporting bus current letter
Number block information.The output end of variable restriction resistive module and the output end of phase shift block are separately connected measured signal driving
The input terminal of module, measured signal drive module another lumination of light emitting diode, the light emitting diode are denoted as second luminous two
Pole pipe, for exporting the measured signal of reflection bus current signal.
In low-pressure side, two photodiodes: the first photodiode and the second photodiode are provided with, wherein
First photodiode is connected to the input terminal of electric current section photoelectric conversion module, and the second photodiode is connected to measured signal
The input terminal of photoelectric conversion module, the output end of electric current section photoelectric conversion module also connect measured signal photoelectricity modulus of conversion simultaneously
The output end of the input terminal of block, measured signal photoelectricity conversion module connects secondary device.First photodiode with it is on high-tension side
First light emitting diode is connected by the first optical fiber, passes through the second optical fiber between the second photodiode and the second light emitting diode
Connection.
As shown in Fig. 2, the method for transmitting signals realized by the current transducer signal Transmission system of above-mentioned Wide measuring range,
Include the following steps:
Step 1001, the output signal of LPCT is divided by multiple voltage ranges according to the range of LPCT.
According to the range of bus current, total range is divided into multiple electric current sections, such asI 1 ~I 2 , I 2 ~I 3 ... ... I n-1 ~I n ,
Simultaneously because the voltage signal of LPCT outputU 1 Directly reflect the size of bus current, the corresponding electricity for obtaining multiple LPCT outputs
Pressure section, such asU 1 - 1 ~U 1-2 ,U 1-2 ~U 1-3 ... ...U 1-(n-1) ~U 1-n 。
For example, being classified as following multiple current measurement section 3A ~ 100A, 100A according to the measuring range of certain model LPCT
~ 500A, 500A or more, the corresponding voltage signal for obtaining LPCT outputU 1 Corresponding voltage section: 3V ~ 10V, 10V ~ 20V and
20V or more.
Step 1002, LPCT output voltage signal, and section letter is performed simultaneously according to the voltage signal that LPCT is exported respectively
It ceases and determines that process and measured signal improve process.
Block information determines that process includes the following steps:
The voltage signal of step 1003-1, LPCT output is sent into rectification filtering module.
The voltage signal of LPCT outputU 1 The voltage letter of direct current is obtained into after carrying out rectifying and wave-filtering in rectification filtering module
NumberU 2 .Rectification is realized using rectifier diode in rectification module, since there are pressure drops for rectifier diode, works as bus current
It is smaller, i.e. voltage signalU 1 When less than certain numerical value, rectification filtering module the case where there are no signal outputs, and voltage is believed at this time
NumberU 2 It is 0.
Step 1003-2, block information judgment module determine locating section and export corresponding signal.
The voltage signal of rectification filtering module outputU 2 Into block information judgment module, by block information judgment module pair
Voltage signalU 2 Numerical value judged, and according to voltage signalU 2 Numerical value export different voltage signals.
It can be seen from the above, to the voltage signal of LPCT outputU 1 It is segmented, therefore works as voltage signalU 1 Through over commutation
The voltage signal obtained after filteringU 2 The voltage range of corresponding number can equally be obtainedU 2 - 1 ~U 2-2 ,U 2-2 ~U 2-3 ... ...U 2-(n-1) ~U 2-n .Block information judgment module is according to voltage signalU 2 Locating voltage section can correspond to obtain voltage signalU 2 Institute
The voltage section at place may further obtain electric current section locating for bus current.Block information judgment module is then according to electricity
Press signalU 2 The different voltage signal of the different output numerical values of locating voltage section.
Block information judgment module may be accomplished by: take more voltage-stabiliser tubes, the quantity and LPCT of voltage-stabiliser tube are defeated
Voltage signal outU 1 The quantity of the voltage section of division is consistent, and the pressure stabilizing numerical value of voltage-stabiliser tube is incremented by successively.It is incited somebody to action as above-mentioned
The voltage signal of LPCT outputU 1 Three voltage sections: 3V ~ 10V, 10V ~ 20V and 20V or more are divided into, therefore are arranged three
Voltage-stabiliser tubeVD1~VD3, voltage-stabiliser tubeVD1~VD3Pressure stabilizing numerical value be respectively 3V, 7V and 10V.
Three voltage-stabiliser tubesVD1~VD3It connects respectively and forms three loop of voltage regulation after corresponding resistance, three loop of voltage regulation are simultaneously
The output end of pressure stabilizing numerical value accesses the input terminal of analog adder simultaneously after connection, and the output end of analog adder is as block information
The output end of judgment module.It can be seen from the above, working as voltage signalU 1 When lower than 3V, three voltage-stabiliser tubesVD1~VD3It is in cut-off
State, block information judgment module non-output signal.Work as voltage signalU 1 Voltage value be 3V ~ 10V when, voltage-stabiliser tube VD1 is reversed
Breakdown is connected and exports 3V voltage, and the voltage of block information judgment module output is 3V.Similarly, work as voltage signalU 1 Voltage value
When for 10V ~ 20V, the voltage of block information judgment module output is 3V+7V=10V, works as voltage signalU 1 Voltage value be 20V with
When upper, the voltage of block information judgment module output is 3V+7V+10V=20V.
Step 1003-3, block information judgment module is respectively to block information drive module and variable restriction resistive module
Issue output signal.
When block information judgment module is to block information drive module output drive signal, electricity that analog adder is exported
Pressure signal is fed directly in block information drive module, which is driven as driving power by block information drive module
Corresponding light emitting diode (the first light emitting diode) is moved to shine.In block information drive module setting current-limiting resistance, pass through mould
The voltage signal and current-limiting resistance of quasi- adder output obtain constant-current source, drive the first light emitting diode by the constant-current source
It shines.
It can be seen from the above, since the numerical value of the voltage signal of analog adder output is respectively 0V, 3V(voltage-stabiliser tubeVD1Work
Make), 10V(voltage-stabiliser tubeVD1~VD2Work), 20V(voltage-stabiliser tubeVD1~VD3Work), therefore the voltage letter of analog adder output
Number there is apparent step-characteristic, therefore the constant-current source of the first LED operation is driven equally to show the rank of same ratio
Terraced characteristic, so as to so that the light intensity of the first light emitting diode there are notable differences.
Variable restriction resistive module realizes that the output end of pressure-stabilizing of voltage-stabiliser tube is respectively connected to digital current potential using digital regulation resistance
In the different control signal input of device, when voltage-stabiliser tube cut-off or reverse breakdown, the corresponding control terminal of digital regulation resistance is obtained
The different level signal of state (representing digital signal 1 or 0).It needs to be provided according to digital regulation resistance technology in actual needs simultaneously
The specific requirement of material divides the voltage that voltage-stabiliser tube exports by bleeder circuit, so that final output is to digital regulation resistance
Voltage signal be in the identifiable voltage range of digital regulation resistance itself.
Specifically: when three voltage-stabiliser tubes end simultaneously, the status signal that digital regulation resistance receives is (0,0,0),
Similarly, when three voltage-stabiliser tubes simultaneously reverse breakdown and when output voltage, the status signal that digital regulation resistance receives be (1,1,
1), therefore digital regulation resistance can receive the difference of status signal according to it and export different resistance.It is transmitted in this signal
In method, the resistance value of the resistance of digital regulation resistance output is according to voltage signalU 2 Numerical value (voltage section) and be sequentially increased.And
Can be using one of resistance value as standard value, the multiple (being greater than 1 or less than 1) of remaining resistance value standard value indicates.
Measured signal conditioning process includes the following steps:
The voltage signal of step 1004-1, LPCT output is sent into signal conditioning module.
Signal conditioning module includes reference voltage generation module and signal mixing module, the output of reference voltage generation module
Reference voltageU DC With the voltage signal of LPCT outputU 1 The input terminal of signal mixing module is accessed together, and signal mixing module will
Two signals export mixed signal after being mixedU 3 .Reference signal generation module can be realized by reference voltage chip；Signal
Mixing module can be realized by integrated operational amplifier.
Step 1004-2, mixed signal are sent into phase shift block.
Mixed signalU 3 Into phase shift is carried out in phase shift block, phase shift block does not change mixed signalU 3 Size, only to it
An of short duration delay (Microsecond grade) is carried out, and obtains the mixed signal after phase shiftU 4 。
The measured signal of step 1004-3, phase shift block output are sent into measured signal drive module.
The mixed signal of phase shift block outputU 4 It is sent into measured signal drive module, and by mixed signalU 4 As driving electricity
Source drives corresponding light emitting diode (the second light emitting diode) to shine by measured signal drive module.It is driven in measured signal
The linear light emission drive circuit using current-limiting resistance and to the second lumination of light emitting diode of driving is also needed in dynamic model block, and is somebody's turn to do
The resistance value of current-limiting resistance is the resistance value of above-mentioned variable restriction resistive module, therefore drives the linear hair of the second lumination of light emitting diode
The resistance of light drive circuit is variable.The driving of the second lumination of light emitting diode of driving on high-tension side measured signal drive module
Circuit uses constant current Linear light emission drive circuit.
The specific embodiment of linear light emission drive circuit is documented in the applicant filed on August 17th, 2016, Shen
It please number be 201610678235.5, patent name is a kind of optical signal linear transmission system and Active Electronic Current Transformer
In patent document, " the optical signal linear transmission system " recorded in the specific embodiment and this document of linear light emission drive circuit
Identical, details are not described herein.
All-pass filter realization can be used in phase shift block, which does not change mixed signalU 3 Size, only to mixing
SignalU 3 Doing a time isTTime delays.Phase shift block is set, when its object is to determine that process is realized with block information
Between match, i.e. mixed signal after phase shiftU 4 When entering measured signal drive module, variable restriction resistive module is defeated
Out and mixed signalU 4 And matched resistance value.
Mixed signalU 3 And voltage signalU 2 Directly it is reflected in voltage signalU 1 , and mixed signalU 4 Only by mixed
Close signalU 3 Phase shift obtains, so mixed signalU 4 And voltage signalU 2 Directly it is reflected in voltage signalU 1 , and it is related to mixing
SignalU 4 And the current-limiting resistance of the linear light emission drive circuit size of the second lumination of light emitting diode of driving is by voltage signalU 2 's
Size decision, and according to the above-mentioned value rule for current-limiting resistance it is found that working as voltage signalU 1 When smaller, variable restriction electricity
The resistance value for hindering the output of module becomes smaller, therefore drives the current signal (mixed signal of the second lumination of light emitting diodeU 4 / current limliting electricity
Resistance) dynamic range become larger so that the power (amplitude) of measured signal becomes larger, increase mixed signalU 4 Corresponding optical signal
Dynamic range, improve signal-to-noise ratio of the measured signal in the lesser situation of amplitude, make mixed signalU 4 Transmission precision increase
It greatly, together should voltage signalU 1 When larger, the defeated of variable restriction resistive module is made by the control to variable restriction resistive module
Resistance value out becomes larger, therefore the dynamic range of the current signal of the second lumination of light emitting diode is driven accordingly to become smaller.
Step 1005, block information and measured signal are transmitted by optical fiber.
The block information exported by block information drive module and the measured signal exported by measured signal drive module
Low-pressure side is transferred to by respective optical fiber (the first optical fiber and the second optical fiber) respectively, and respectively by wayside signaling photoelectric conversion
Module and measured signal photoelectricity conversion module are received.
Step 1006, block information is obtained by wayside signaling photoelectric conversion module.
The first photodiode is provided in wayside signaling photoelectric conversion module, the first photodiode receives first
Voltage signal is converted to after the signal of optical fiber, thus wayside signaling photoelectric conversion module can get voltage signalU 1 Section letter
Breath, therefore the resistance value of variable restriction resistive module reality output has been obtained, and may further know and be transmitted to low-pressure side at this time
Measured signal amplitude and measured signal actual magnitude increase the multiple of (or reduce), wayside signaling photoelectric conversion module should
Multiple value is sent to measured signal photoelectricity conversion module.
Step 1007, measured signal photoelectricity conversion module restores actual measured signal.
The second photodiode is provided in measured signal photoelectricity conversion module, the second photodiode receives second
Optical fiber send to optical signal, and be converted to the electric signal for representing measured signal, and be sent into according to wayside signaling photoelectric conversion module
Multiple value, two times transfer is carried out to the measured signal that receives and be converted to, current measured signal is subjected to falling for multiple value
The transformation of several times, to obtain actual measured signal.
Step 1008, the original signal of measured signal is obtained according to practical side measured signal.
Since measured signal is in passing through optical fiber transmission process, because a variety of causes can decay, by step
Practical 1007 finally obtained measured signals are mixed signalU 4 Signal after decaying, as mixed signalU 4 ', therefore to
The output end for surveying signal photoelectric conversion module is connected with signal separation module, by signal separation module by mixed signalU 4 ' point
From forU DC ' and voltage signalU 1 ', voltage signalU DC ' and voltage signalU 1 ' it is respectively the reference voltage signal after transmissionU DC With
Voltage signalU 1 Deamplification, due to reference voltage signalU DC For known signal, reference voltage signal is measured so passing throughU DC
And voltage signalU DC ' attenuation degree can correspond to obtain electric signal to be transmittedU 1 Attenuation degree in transmission process, because
Electric signal to be transmitted can be calculated in thisU AC , and then the size of bus current is calculated.Signal separation module can pass through
The prior art is realized, is such as sampled by microprocessor to voltage signal, then using fft algorithm to various frequency components
Signal is calculated.The original signal of finally obtained measured signal is sent into secondary device.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (9)
1. a kind of current transducer signal Transmission system of Wide measuring range, including the high-pressure side connected by optical fiber and low-pressure side,
Current transformer is connected to high-pressure side, and the signal that current transformer exports is sent to low-pressure side by high-pressure side by optical fiber,
It is characterized in that: further including block information judgment module and signal conditioning module, the output end of current transformer connects rectification simultaneously
The input terminal of filter module and signal conditioning module, the input of the output end connection section signal judgement module of rectification filtering module
End, the input terminal of the output end connection measured signal drive module of signal conditioning module, measured signal drive module is according to signal
The voltage signal of conditioning module output drives the optical signal of sending different capacity of the second light emitting diode in it, and optical signal passes through
The input terminal of second optical fiber connection low-pressure side measured signal photoelectricity conversion module；
The output end of block information judgment module is separately connected the input of block information drive module and variable restriction resistive module
End, block information drive module drive the first light emitting diode in it to send out according to the signal that block information judgment module exports
The optical signal of multistage different capacity out, optical signal connect the input of low-pressure side wayside signaling photoelectric conversion module by the first optical fiber
End；Variable restriction resistive module changes according to the unlike signal that block information judgment module exports to measured signal drive module
The resistance value of output；
In low-pressure side, the output end of wayside signaling photoelectric conversion module is also connected with the input terminal of measured signal photoelectricity conversion module.
2. the current transducer signal Transmission system of Wide measuring range according to claim 1, it is characterised in that: described
Signal conditioning module includes the reference voltage generation module for generating reference signal, and by reference signal and current transformer
The signal mixing module that the signal of output is mixed.
3. the current transducer signal Transmission system of Wide measuring range according to claim 1, it is characterised in that: described
Signal conditioning module and measured signal drive module between be additionally provided with for carrying out the output signal of signal conditioning module
The phase shift block of delay.
4. the current transducer signal Transmission system of Wide measuring range according to claim 1, it is characterised in that: described
Measured signal drive module in, be provided with the linear light emission drive circuit for driving second LED operation,
Linear light emission drive circuit is obtained by the resistance that the voltage of signal conditioning module is exported with the variable restriction resistive module.
5. the current transducer signal Transmission system of Wide measuring range according to claim 1, it is characterised in that: described
The pressure stabilizing numerical value that block information judgment module includes more voltage-stabiliser tubes incremented by successively, voltage-stabiliser tube are connected respectively after corresponding resistance
Corresponding loop of voltage regulation is formed, the output end of pressure stabilizing numerical value accesses the input of analog adder simultaneously after a plurality of loop of voltage regulation is in parallel
The output end at end, analog adder connects the block information drive module；The output end of pressure-stabilizing of voltage-stabiliser tube is separately connected variable
The different input terminals of current-limiting resistance module.
6. the current transducer signal Transmission system of Wide measuring range according to claim 5, it is characterised in that: described
Variable restriction resistive module is digital regulation resistance, is additionally provided between the output end of voltage-stabiliser tube and the input terminal of digital regulation resistance
Divider resistance.
What 7. a kind of current transducer signal Transmission system using the described in any item Wide measuring ranges of claim 1 ~ 6 was realized
Transmission method, characterized by the following steps:
The output signal of current transformer is divided into multiple electric current sections according to the range of current transformer by step a；
Step b, current transformer output voltage signal, and area is performed simultaneously according to the voltage signal that current transformer exports respectively
Between information determine process and measured signal conditioning process, by execute block information determine process obtain current transformer output letter
Number block information, by execute measured signal improve process, obtain current transformer output signal to be transmitted；
Step c, it is respectively that the block information of current transformer output signal and electric current is mutual by the first optical fiber and the second optical fiber
The signal to be transmitted of sensor output is sent to secondary side；
Step d, wayside signaling photoelectric conversion module is converted to block information by the optical signal that optical fiber is sent into, and section is believed
Breath is sent to measured signal photoelectricity conversion module；
Step e, measured signal photoelectricity conversion module is converted to measured signal by the optical signal that optical fiber is sent into, then according to area
Between signal photoelectric conversion module be sent into block information the measured signal being converted to is handled, reduction be sent into measured signal
Measured signal when drive module；
Step f, measured signal photoelectricity conversion module carry out Signal separator, final reduction current mutual inductor output to measured signal
Signal to be transmitted.
8. transmission method according to claim 7, it is characterised in that: the block information determines that process includes following step
It is rapid:
The voltage signal of current transformer output is sent into rectification filtering module and carries out rectifying and wave-filtering by step b-1；
Step b-2, block information judgment module determine section locating for the voltage signal of current transformer output and respectively to sections
Information drive module and variable restriction resistive module export corresponding signal；
Step b-3, block information drive module pass through the current limliting electricity in it according to the output voltage of block information judgment module
Resistance forms constant-current source, drives the first LED operation, issues the optical signal for the power that matches with block information；
The output signal that variable restriction resistive module is issued according to block information judgment module is exported to measured signal drive module
Corresponding resistance value, as the current-limiting resistance for forming linear light emission drive circuit in measured signal drive module.
9. transmission method according to claim 7, it is characterised in that: the measured signal conditioning process includes following step
It is rapid:
The voltage signal of step b ' -1, current transformer output is sent into signal conditioning module, passes through letter in signal conditioning module
Number mixing module is superimposed reference voltage, forms mixed signal；
Step b ' -2, mixed signal, which enters, carries out phase shift in phase shift block；
The measured signal of step b ' -3, phase shift block output is sent into measured signal drive module as driving power, with variable limit
Leakage resistance module input tissue signal forms the linear light emission drive circuit of the second LED operation of driving.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112068020A (en) * | 2019-05-21 | 2020-12-11 | 上海海拉电子有限公司 | Diagnosis circuit and diagnosis method for DC-DC converter and DC-DC converter |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689062A (en) * | 1979-10-04 | 1981-07-20 | Hydro Quebec | Method and system for sensing current of high voltage transmisson line using digital inforamation transmission by optical fiber |
| US5262726A (en) * | 1990-05-30 | 1993-11-16 | The Furukawa Electric Co., Ltd. | Method and system for inspection of electroconductive film using eddy current |
| CN2446614Y (en) * | 2000-10-12 | 2001-09-05 | 杜慧珍 | Fiber-optical conductor of current transformer signal |
| US20030060162A1 (en) * | 2001-09-26 | 2003-03-27 | Mitsuru Shinagawa | Transceiver suitable for data communications between wearable computers |
| CN201285432Y (en) * | 2008-08-27 | 2009-08-05 | 华北电力科学研究院有限责任公司 | Magnetic field current uploading apparatus for electricity generator |
| CN104166042A (en) * | 2014-07-28 | 2014-11-26 | 中国电子科技集团公司第八研究所 | Measuring range self-adaptive current detection fiber transmission system and detection method |
| CN104655908A (en) * | 2015-03-09 | 2015-05-27 | 山东理工大学 | Signal transmission device and method for current transformer |
| CN104991105A (en) * | 2015-07-14 | 2015-10-21 | 国家电网公司 | Remote-energy-supply high-voltage line current sensing detection system based on optical fiber |
| CN105675961A (en) * | 2016-02-19 | 2016-06-15 | 广州市诚臻电子科技有限公司 | Voltage testing device and system capable of bearing high electromagnetic radiation field, and application |
| CN106253979A (en) * | 2016-08-17 | 2016-12-21 | 山东理工大学 | A kind of optical signal linear transmission system and Active Electronic Current Transformer |
| CN207706136U (en) * | 2016-08-02 | 2018-08-07 | 颖飞公司 | Communication system and trans-impedance amplifier |
-
2018
- 2018-10-10 CN CN201811179206.XA patent/CN109270318B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689062A (en) * | 1979-10-04 | 1981-07-20 | Hydro Quebec | Method and system for sensing current of high voltage transmisson line using digital inforamation transmission by optical fiber |
| US5262726A (en) * | 1990-05-30 | 1993-11-16 | The Furukawa Electric Co., Ltd. | Method and system for inspection of electroconductive film using eddy current |
| CN2446614Y (en) * | 2000-10-12 | 2001-09-05 | 杜慧珍 | Fiber-optical conductor of current transformer signal |
| US20030060162A1 (en) * | 2001-09-26 | 2003-03-27 | Mitsuru Shinagawa | Transceiver suitable for data communications between wearable computers |
| CN201285432Y (en) * | 2008-08-27 | 2009-08-05 | 华北电力科学研究院有限责任公司 | Magnetic field current uploading apparatus for electricity generator |
| CN104166042A (en) * | 2014-07-28 | 2014-11-26 | 中国电子科技集团公司第八研究所 | Measuring range self-adaptive current detection fiber transmission system and detection method |
| CN104655908A (en) * | 2015-03-09 | 2015-05-27 | 山东理工大学 | Signal transmission device and method for current transformer |
| CN104991105A (en) * | 2015-07-14 | 2015-10-21 | 国家电网公司 | Remote-energy-supply high-voltage line current sensing detection system based on optical fiber |
| CN105675961A (en) * | 2016-02-19 | 2016-06-15 | 广州市诚臻电子科技有限公司 | Voltage testing device and system capable of bearing high electromagnetic radiation field, and application |
| CN207706136U (en) * | 2016-08-02 | 2018-08-07 | 颖飞公司 | Communication system and trans-impedance amplifier |
| CN106253979A (en) * | 2016-08-17 | 2016-12-21 | 山东理工大学 | A kind of optical signal linear transmission system and Active Electronic Current Transformer |
Non-Patent Citations (1)
| Title |
|---|
| 王玮 等: "一种用于电子式电流互感器的信号处理方法", 《科学技术与工程》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112068020A (en) * | 2019-05-21 | 2020-12-11 | 上海海拉电子有限公司 | Diagnosis circuit and diagnosis method for DC-DC converter and DC-DC converter |
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|---|---|
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