CN110426667A - A kind of system and method for all-fiber current transformator progress wideband verification - Google Patents
A kind of system and method for all-fiber current transformator progress wideband verification Download PDFInfo
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Abstract
The present invention relates to a kind of for carrying out the system and method for wideband verification to all-fiber current transformator, comprising: verifying power supply device is used for output verification voltage signal, the first current magnitude information and the first current phase information；Merging module is acquired, is connected with verifying power supply device, for acquiring first current magnitude information and the first current phase information and carrying out merging treatment, to obtain digital signal；Protocol conversion module is connected, for the digital signal to be converted to TCP/IP signal with the acquisition merging module；Correction verification module, it is connected respectively with the verifying power supply device and protocol conversion module, for obtaining the ratio difference and angular difference value of electric current in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal, to carry out wideband verification to the all-fiber current transformator.The present invention can accurately verify the performance of all-fiber current transformator in the frequency range of 50Hz~2500Hz, and checking precision is high, easy to operate, meet actual requirement of engineering.
Description
Technical field
The present invention relates to power equipment Test And Check Technology fields, and more particularly, to one kind for all -fiber
The system and method for current transformer progress wideband verification.
Background technique
As HVDC transmission system continues to develop, a large amount of power electronic equipments and nonlinear load access power grid, lead
It sends a telegraph in net and a large amount of higher hamonic waves occurs.Therefore, to the wideband measurement capability of DC current transformer, more stringent requirements are proposed.
The amplitude error of measurement for the fundamental wave and harmonic current of 50Hz~1200Hz, electronic direct-current current measuring device should not surpass
0.75% is crossed, 500 μ s are not to be exceeded in phase angle error.All-fiber current transformator is a kind of electronics based on Faraday magnetooptical effect
Formula current transformer.Compared with traditional electromagnetic current transducer, with accuracy of measurement height, dynamic range is big, insulation is simple
It is single, Electro Magnetic Compatibility is good, the advantages such as flexible for installation, AC and DC electric current can be measured simultaneously, had in high-voltage dc transmission electrical domain wide
Wealthy application prospect.
Since the progress of disease bandwidth of magneto-optic effect is very high, it is generally recognized that the wideband measurement performance of all-fiber current transformator compared with
It is good, but all-fiber current transformator generallys use digital filter and is filtered to the output of closed loop detection system, this meeting
Different degrees of decaying and phase delay are caused to the signal of different frequency, lead to amplitude error relevant to signal frequency and phase
Angle error influences the wideband measurement performance of mutual inductor.FOCT is within the scope of 50Hz~1200Hz in the prior art, and measurement error is not
More than 0.55%, band is wider than 10kHz.The wideband verification of all -fiber direct current instrument transformer is carried out essentially according to national standard at present
Frequency response experiment under 50Hz~1200Hz, lacks to the verification under higher frequency harmonic wave to all -fiber mutual inductor metering performance
Ability.
Summary of the invention
The present invention proposes a kind of system and method for all-fiber current transformator progress wideband verification, to solve such as
The problem of what carries out wideband verification to all-fiber current transformator under high-frequency harmonic wave.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided it is a kind of for full optical-fiber current mutual inductance
The system of device progress wideband verification, which is characterized in that the system comprises:
Verifying power supply device, comprising: be sequentially connected and form the signal generating unit in primary current circuit, power amplification list
Member and broadband up-flow device, and the standard mutual inductor unit and full optical-fiber current in the access primary current circuit of connecting respectively are mutual
Sensor, the verifying power supply device are used to pass through the standard mutual inductor unit output verification voltage signal；For by described
All-fiber current transformator exports the first current magnitude information and the first current phase information；
Acquire merging module, be connected with the verifying power supply device, for acquire first current magnitude information and
First current phase information simultaneously carries out merging treatment, to obtain digital signal；
Protocol conversion module is connected, for the digital signal to be converted to TCP/IP with the acquisition merging module
Signal；
Correction verification module is connected with the verifying power supply device and protocol conversion module respectively, for according to the verification
Voltage signal and TCP/IP signal obtain the ratio difference and angular difference value of electric current in different frequency scope respectively, to all -fiber
Current transformer carries out wideband verification.
Preferably, wherein the signal generating unit, is used for the adjustable first voltage signal of occurrence frequency；The power is put
Big unit, for amplifying the first voltage signal, to obtain second voltage signal；The broadband up-flow device, for according to institute
It states second voltage signal and generates corresponding first current signal；The all-fiber current transformator, for according to first electricity
It flows signal and generates first current magnitude information and the first current phase information；The standard mutual inductor unit is used for basis
First current signal generates calibration voltage signal.
Preferably, wherein the correction verification module, comprising: synchronization unit and processing unit,
The synchronization unit makes the standard mutual inductor unit and the full optical-fiber current for generating synchronizing clock signals
The signal of mutual inductor output is synchronous；
The processing unit, for according to first current magnitude information of TCP/IP signal acquisition and the first current phase
Information, according to second current magnitude information of calibration voltage signal acquisition and the second current phase information, and by described first
Current magnitude information and the second current magnitude information are compared, to obtain the ratio difference of electric current in different frequency scope；By institute
It states the first current phase information and the second current phase information is compared, to obtain the angular difference of the electric current in different frequency scope
Value carries out wideband verification to the all-fiber current transformator than difference and angular difference value according to described.
Preferably, wherein the processing unit, according to it is described than difference and angular difference value to the all-fiber current transformator
Carry out wideband verification, comprising:
According to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to all -fiber
Current transformer carries out wideband verification.
Preferably, wherein the processing unit, comprising: digital signal processor, application-specific integrated circuit ASIC or scene can
Program gate array FPGA.
Preferably, wherein the system also includes memory module and wireless communication modules；The memory module include: to
A few read only memory ROM, random access memory ram, flash memory or Electrical Erasable programmable read only memory
EEPROM, the wireless communication module include: wireless LAN communication equipment and/or mobile communication network device, described wireless
Local area network communication equipment includes: at least one of bluetooth, ZigBee and Wi-Fi communication；The mobile communication network device packet
It includes: at least one of 2G wireless communication chips, 3G wireless communication chips and 4G wireless communication chips.
According to another aspect of the present invention, it provides a kind of for carrying out wideband verification to all-fiber current transformator
Method, which is characterized in that the described method includes:
Obtain the calibration voltage signal of standard mutual inductor unit output and the first electricity of all-fiber current transformator output
Flow amplitude information and the first current phase information；
It acquires first current magnitude information and the first current phase information and carries out merging treatment, to obtain number letter
Number；
The digital signal is converted into TCP/IP signal；
According to the calibration voltage signal and TCP/IP signal obtain in different frequency scope respectively the ratio difference of electric current and
Angular difference value, to carry out wideband verification to the all-fiber current transformator.
Preferably, wherein the calibration voltage signal for obtaining the output of standard mutual inductor unit and full optical-fiber current are mutual
The first current magnitude information and the first current phase information of sensor output, comprising:
The adjustable first voltage signal of signal generating unit occurrence frequency；
Power amplification unit amplifies the first voltage signal, to obtain second voltage signal；
Broadband up-flow device generates corresponding first current signal according to the second voltage signal；
All-fiber current transformator generates first current magnitude information and the first electricity according to first current signal
Flow phase information；
Standard mutual inductor unit generates calibration voltage signal according to first current signal.
Preferably, wherein described obtain in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
The ratio difference and angular difference value of electric current, to carry out wideband verification to the all-fiber current transformator, comprising:
Generate the signal that synchronizing clock signals export the standard mutual inductor unit and the all-fiber current transformator
It is synchronous；
According to first current magnitude information of TCP/IP signal acquisition and the first current phase information, according to the verification
Voltage signal obtains the second current magnitude information and the second current phase information；
First current magnitude information and the second current magnitude information are compared, to obtain in different frequency scope
The ratio difference of electric current；
First current phase information and the second current phase information are compared, to obtain in different frequency scope
Electric current angular difference value；And
Wideband verification is carried out to the all-fiber current transformator than difference and angular difference value according to described.
Preferably, wherein described carry out wideband school to the all-fiber current transformator than difference and angular difference value according to described
It tests, comprising:
According to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to all -fiber
Current transformer carries out wideband verification.
The present invention provides a kind of for carrying out the system and method for wideband verification to all-fiber current transformator, comprising:
Verifying power supply device is used for output verification voltage signal, the first current magnitude information and the first current phase information；Acquisition merges
Module is connected with the verifying power supply device, for acquiring first current magnitude information and the first current phase information
And merging treatment is carried out, to obtain digital signal；Protocol conversion module is connected with the acquisition merging module, is used for institute
It states digital signal and is converted to TCP/IP signal；Correction verification module is connected with the verifying power supply device and protocol conversion module respectively
It connects, for obtaining the ratio difference of electric current and angle in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
Difference, to carry out wideband verification to the all-fiber current transformator.Of the invention is used to carry out all-fiber current transformator
The system of wideband verification can carry out the performance of all-fiber current transformator in the frequency range of 50Hz~2500Hz accurate
Verification, checking precision is high, easy to operate, meets actual requirement of engineering, in addition can also verify system to different current transformers
The selection of the verifying power supply device of system has directive significance.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is according to embodiment of the present invention for carrying out the system 100 of wideband verification to all-fiber current transformator
Structural schematic diagram；
Fig. 2 is the current phase schematic diagram according to embodiment of the present invention；
Fig. 3 is the reality according to the system for carrying out wideband verification to all-fiber current transformator of embodiment of the present invention
Example diagram；
Fig. 4 be according to the impedance of the primary circuit to all-fiber current transformator check system of embodiment of the present invention into
The schematic diagram of row test；
Fig. 5 is the result schematic diagram according to the ratio difference of the acquisition of embodiment of the present invention；
Fig. 6 is the result schematic diagram according to the angular difference value of the acquisition of embodiment of the present invention；And
Fig. 7 is according to embodiment of the present invention for carrying out the method 700 of wideband verification to all-fiber current transformator
Flow chart.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is according to embodiment of the present invention for carrying out the system 100 of wideband verification to all-fiber current transformator
Structural schematic diagram.As shown in Figure 1, embodiments of the present invention offer is used to carry out wideband school to all-fiber current transformator
The system tested can accurately verify the performance of all-fiber current transformator in the frequency range of 50Hz~2500Hz,
Checking precision is high, easy to operate, meets actual requirement of engineering, in addition can also be to the school of different current transformer check systems
The selection of electrical verification source device has directive significance.What embodiments of the present invention provided is used to carry out all-fiber current transformator
The system 100 of wideband verification, comprising: verifying power supply device 101, acquisition merging module 102, protocol conversion module 103 and verification
Module 104.
Preferably, the verifying power supply device 101, comprising: be sequentially connected and the signal for forming primary current circuit occurs
Unit 1011, power amplification unit 1012 and broadband up-flow device 1013, and series connection accesses the primary current circuit respectively
Standard mutual inductor unit 1014 and all-fiber current transformator 1015, the verifying power supply device 101 is for passing through the standard
1014 output verification voltage signal of mutual inductor unit；For exporting the first electric current width by the all-fiber current transformator 1015
Value information and the first current phase information.
Preferably, wherein the signal generating unit 1011, is used for the adjustable first voltage signal of occurrence frequency；The function
Rate amplifying unit 1012, for amplifying the first voltage signal, to obtain second voltage signal；The broadband up-flow device
1013, for generating corresponding first current signal according to the second voltage signal；The all-fiber current transformator 1015,
For generating first current magnitude information and the first current phase information according to first current signal；The standard is mutual
Sensor cell 1014, for generating calibration voltage signal according to first current signal.
In embodiments of the present invention, signal generating unit is signal generator, and power amplification unit is power amplification
Device.Offer is amplified in measured signal by signal generator after power amplifier and broadband up-flow device, standard mutual inductor unit and complete
Optical fiber current mutual inductor series connection accesses tested current loop, and wherein all-fiber current transformator exports the acquired unit of FT3 signal
It is transferred to combining unit by optical fiber, TCP/IP signal, input direct-current electronics transducer check are converted to by protocol converter
Instrument.The secondary output of standard current transformer is converted into voltage signal input direct-current electronics mutual inductor by the measuring resistance of 1 Ω
Tester.The DC electronic mutual-inductor tester for relying on LabVIEW platform issues synchronizing clock signals and guarantees full optical-fiber current
Mutual inductor is synchronous with the output signal of standard mutual inductor, and is obtained by program calculation than poor, angular difference equal error signal.To improve
Accuracy of measurement, choosing predetermined number is the ratio difference exported in 10 periods, the average value of angular difference value as final result.
The power supply device of check system as mutual inductor, power source generator to the stability of power supply, irregularity of wave form and
Noise requirements are very high, commonly realize that large capacity Harmonic Current has the advantages that capacity is big using power electronic technique, but due to
Its noise in output signal is too big, it is difficult to realize high accuracy transmission of quantity value, meanwhile, harmonic current source also has load capacity is weak,
The shortcomings that power supply is not isolated with primary circuit.Therefore, in embodiments of the present invention, high-power Harmonic Current generator uses
The scheme of signal generator, power amplifier in conjunction with current lifting device, wherein signal generator provides low abnormal for power amplifier
Become, the adjustable signal grade input of frequency, power amplifier carries out power amplification, output of the current lifting device to power amplifier to signal
Electric current, which is extended, is supplied to current ratio standard.Another effect of current lifting device is to provide power amplifier and primary circuit
The direct current biasing of power amplifier output is eliminated in isolation.
In embodiments of the present invention, signal generating unit is configured to generate the adjustable first voltage signal of frequency；
Power amplification unit is amplified based on the first voltage signal power to export second voltage signal；Broadband up-flow device, matches
It is set to and current signal is generated based on the second voltage signal；Wherein, signal generating unit, power amplification unit and broadband up-flow
Device forms current loop.Wherein, first voltage signal is low-voltage high-frequency voltage signal, and second voltage signal is high voltage high frequency voltage
Signal, calibration voltage signal are low-voltage high-frequency voltage signal, and the high current high-frequency current that the first current signal is 10A-120A is believed
Number.First winding the number of turns of broadband up-flow device is 20 circles, and secondary winding the number of turns is single turn.
The system for carrying out wideband verification to all-fiber current transformator of embodiment of the present invention further include: power supply mould
Block, for providing power supply support for the standard mutual inductor unit.
The signal generating unit 1011 is single-phase dynamic waveform power source, and the signal of output includes direct current, square wave, three
The single-phase combined-voltage or electric current of angle wave, sine wave or superposition highest 129 times harmonic waves.The signal generating unit 1011 can
Think that signal generator, the first voltage signal that signal generating unit generates include the alternating current in 0.001-5KHz frequency range
Pressure.
The standard mutual inductor unit 1014, comprising: standard mutual inductor and the secondary side string with the standard mutual inductor
The measuring resistance of connection；The measuring resistance is made of copper-manganese material.
When carrying out wideband verification, digital signal is FT3 signal；The digital signal includes: the first current magnitude information
With the first current phase information.The resistance value of measuring resistance is 1 Ω, and measuring resistance is made of copper-manganese material.It should be noted that
The secondary side of standard mutual inductor cannot open a way, the earthing of casing.
The present invention, which forms current loop by signal generating unit, power amplification unit and broadband up-flow device, to be verification
System provides stability height, the basic noiseless of output signal, can be realized high accuracy transmission of quantity value, load capacity height and electric current
The advantages that circuit is isolated with primary circuit, broadband up-flow device also provide being isolated for power amplifier and primary circuit, eliminate power
The direct current biasing of amplifier output, the check system are able to satisfy to all -fiber mutual inductor frequency in 50Hz-2500Hz frequency range
The requirement of rate response test accuracy.
In embodiments of the present invention, the electric current of all-fiber current transformator than difference fIIt defines as the following formula:
Wherein, KIFor the rated current ratio of current transformer；I1For the effective amplitude of primary current；I2It is effective for secondary current
Amplitude.
Angle value of deltaIIt is defined as the phase difference of primary current phasor Yu secondary current phasor, unit Wei " ˊ ".As shown in Fig. 2,
Phasor orientation is determined so that the phase difference of ideal current mutual inductor is zero, when the advanced primary current phasor of secondary current phasor,
Phase difference is positive, otherwise is negative.Secondary current is first made in phasor diagramPressure drop on secondary load isAgain plus
Upper secondary current is obtained in the pressure drop of secondary internal resistanceIron core magnetic fluxIn advance90 ° of phase, exciting currentIt is again advancedHystertic angle ψ,WithAddition is exactlyWithThe error of amplitude is exactly ratio difference, and-WithPhase
Difference δ be exactly phase difference.In advanceIt is positive when phase, lag is negative.
Preferably, the acquisition merging module 102, is connected with the verifying power supply device 101, for acquiring described
One current magnitude information and the first current phase information simultaneously carry out merging treatment, to obtain digital signal.
In embodiments of the present invention, acquisition merging module includes: acquisition unit and combining unit, acquisition unit connection
The all-fiber current transformator, for acquiring first current magnitude information and the first current phase information (after merging i.e.
Digital signal)；Combining unit is connected with the acquisition unit, for first current magnitude information and the first electric current
Phase information merges processing, to obtain digital signal.
Preferably, the protocol conversion module 103 is connected with the acquisition merging module 102, is used for the number
Signal is converted to TCP/IP signal.
Preferably, the correction verification module 104 is connected with the verifying power supply device 101 and protocol conversion module 103 respectively
It connects, for obtaining the ratio difference of electric current and angle in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
Difference, to carry out wideband verification to the all-fiber current transformator.
Preferably, wherein the correction verification module 104, comprising: synchronization unit 1041 and processing unit 1042.
Preferably, the synchronization unit 1041 makes the standard mutual inductor unit and institute for generating synchronizing clock signals
The signal for stating all-fiber current transformator output is synchronous.
Preferably, the processing unit 1042, for according to first current magnitude information of TCP/IP signal acquisition and
First current phase information, according to second current magnitude information of calibration voltage signal acquisition and the second current phase information,
And be compared first current magnitude information and the second current magnitude information, to obtain electric current in different frequency scope
Compare difference；First current phase information and the second current phase information are compared, to obtain in different frequency scope
Electric current angular difference value, wideband verification is carried out to the all-fiber current transformator than difference and angular difference value according to described.
Preferably, wherein the processing unit 1042, according to described more mutual to the full optical-fiber current than difference and angular difference value
Sensor carries out wideband verification, comprising:
According to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to all -fiber
Current transformer carries out wideband verification.
Preferably, wherein the processing unit 1042, comprising: digital signal processor, application-specific integrated circuit ASIC or existing
Field programmable gate array FPGA.
In embodiments of the present invention, processing unit is DC electronic transformer tester, utilizes the DC electronic
Formula mutual-inductor tester can be handled the signal of acquisition, to realize the verification to all-fiber current transformator.
Preferably, wherein the system also includes memory module and wireless communication modules.Preferably, the memory module,
Include: at least one read only memory ROM, random access memory ram, flash memory or Electrical Erasable may be programmed it is read-only
Memory EEPROM, the wireless communication module, comprising: wireless LAN communication equipment and/or mobile communication network device, institute
Stating wireless LAN communication equipment includes: at least one of bluetooth, ZigBee and Wi-Fi communication；The mobile communications network
Equipment includes: at least one of 2G wireless communication chips, 3G wireless communication chips and 4G wireless communication chips.
Fig. 3 is the reality according to the system for carrying out wideband verification to all-fiber current transformator of embodiment of the present invention
Example diagram.As shown in figure 3, in embodiments of the present invention, the system for carrying out wideband verification to all-fiber current transformator
Include: the signal generator for being sequentially connected and forming primary current circuit, power amplifier and broadband up-flow device, and goes here and there respectively
Couple standard mutual inductor and all-fiber current transformator into the primary current circuit, connects in the secondary side of standard mutual inductor
There is measuring resistance, the resistance value of the measuring resistance is 1 Ω, and is made of copper-manganese material；The signal generator, for frequency to occur
The adjustable first voltage signal of rate；The power amplifier, for amplifying the first voltage signal, to obtain second voltage letter
Number；The broadband up-flow device, for generating corresponding first current signal according to the second voltage signal；The all -fiber electricity
Current transformer, for generating first current magnitude information and the first current phase information according to first current signal；
The standard mutual inductor, for generating calibration voltage signal according to first current signal；And it is mutual for standard using power supply
Sensor power supply.Acquiring merging module includes: to be connected with all-fiber current transformator, for acquiring the first current amplitude letter
Breath and the first current phase information simultaneously carry out merging treatment, to obtain digital signal.Protocol conversion module is protocol converter, with
The acquisition merging module is connected, for the digital signal to be converted to TCP/IP signal.Correction verification module, comprising: synchronous
Unit and processing unit, processing unit, that is, DC electronic transformer tester.
When carrying out wideband verification, the synchronizing clock signals that synchronization unit generates make the standard mutual inductor unit and described
The signal of all-fiber current transformator output is synchronous, and then DC electronic transformer tester is then according to the TCP/IP signal
The first current magnitude information and the first current phase information are obtained, is believed according to second current amplitude of calibration voltage signal acquisition
Breath and the second current phase information, and first current magnitude information and the second current magnitude information are compared, to obtain
Take the ratio difference of electric current in different frequency scope；First current phase information and the second current phase information are compared
Compared with, to obtain the angular difference value of the electric current in different frequency scope, according to it is described than difference and angular difference value to the full optical-fiber current
Mutual inductor carries out wideband verification.
All-fiber current transformator is because the advantage that its accuracy of measurement is high, dynamic range is big is widely used, but reality
The accuracy of all-fiber current transformator is too low when measuring higher hamonic wave in the operating condition of border, in order to adapt to current power train unified test
Measure the requirement of higher order harmonics.Of the invention analyzes the primary circuit impedance of all-fiber current transformator check system
Test, is optimized the design of power supply device, the check system after optimization can accurately verify 50Hz~2500Hz frequency
The metering performance of all-fiber current transformator in range.
When frequency is higher, circuit induction reactance be will increase in wideband verification test, may be will affect the fan-out capability of system, be made
It obtains wideband check system reference frequency output and 2500Hz is not achieved.In order to understand the current loop of check system of the invention, this
Text has carried out site-test analysis to the impedance of primary circuit.
Since circuit induction reactance will increase when frequency is higher, the fan-out capability of system may be will affect, so that check system
2500Hz is not achieved in reference frequency output.Therefore, it in order to understand the current loop of check system of the invention, is returned below to primary
The impedance on road has carried out site-test analysis.
The primary current of the verifying power supply device to all-fiber current transformator check system of embodiment of the present invention returns
The schematic diagram that the impedance on road is tested is as shown in Figure 3.In test, needs to calculate rectangle using formula (1) and formula (2) and return
The theoretical inductance on road, wherein h is the width of rectangular-shaped loops, and W is the length of rectangular-shaped loops, and d is diameter of wire.It is counted using formula (3)
The theoretical inductance of circular loop is calculated, wherein D is circuit equivalent diameter, and d is diameter of wire.The numerical value of the loop inductance of theoretical calculation
As shown in table 1.
The voltage signal for inputting different frequency to power amplifier by signal generator, accordingly in primary current circuit
The middle electric current for generating corresponding frequencies.Broadband up-flow device first winding the number of turns is 20 circles, and secondary winding the number of turns is single turn.A piece 100A
High current conducting wire constitutes the secondary winding of broadband up-flow device, and the length is 5m, theoretical D.C. resistance is 4.5m Ω, is arranged as one
The circle that a diameter is about 1.6m.Resistance R is a high accuracy wideband current divider (0.8V/100A), and theoretical resistance value is 8m
Ω, stray capacitance and inductance can be neglected in this test.U is the secondary output voltage of broadband up-flow device, i.e. primary current
Loop voltage measures its amplitude using digital multimeter.UR is the pressure drop of resistance R.Voltage U, UR are inputted into locking phase amplification respectively
The reference input and single ended input of device can measure phase angle difference and its amplitude of the UR relative to U, and then can calculate primary current
The electric current and inductance in circuit.
The corresponding circuit theory inductance of 1 different circuit parameter of table
| Loop parameter | Circuit theory inductance mH |
| Circular loop, D=1.6m, d=10mm | 0.0052 |
| Rectangular-shaped loops, W=1.25m, h=1.25m, d=10mm | 0.0048 |
| Rectangular-shaped loops, W=1.5m, h=1m, d=10mm | 0.0047 |
| Rectangular-shaped loops, W=2m, h=0.5m, d=10mm | 0.0043 |
| Rectangular-shaped loops, W=2.45m, h=0.05m, d=10mm | 0.0023 |
| Rectangular-shaped loops, W=2.47m, h=0.03m, d=10mm | 0.0018 |
When carrying out site-test analysis to primary current impedance loop, according to the test data of table 2, can counter circuit resistance and
Inductance is as shown in table 3.Seen from table 3, when power frequency is 2500Hz, close to 60m Ω, this is one non-for the impedance in the circuit
Often big value, it is possible to the fan-out capability of check system is influenced, so that wideband check system reference frequency output is not achieved
2500Hz.Primary current circuit is subjected to multiple twin processing thus, minimizes loop area, circuit is approximately rectangle at this time, weight
New to carry out the above test, test data is as shown in table 4, calculate loop resistance and inductance it is as shown in table 5.By table 5 as it can be seen that circuit
Inductance is reduced close to half, and when power frequency is 2500Hz, the impedance in the circuit is 33m Ω.It can from table 3 and table 5
Out, which depends primarily on the size of circuit D.C. resistance in low frequency, and circuit sense is then depended primarily in high frequency
Anti- size.
The worst error of comparison sheet 1, table 3 and table 5, loop inductance theoretical value and measured value is about 20%, it is contemplated that practical
Condition when measurement can not be consistent with theoretical hypothesis completely, this error is acceptable.Join in the circuit of the last line of table 1
Number be rectangular-shaped loops width very little when it is roughly equivalent is handled in by return wire multiple twin, i.e., table 5 the case where, error is smaller at this time.
As long as measuring the row conductor multiple twin it is found that the area for reducing primary current circuit as far as possible is gone forward side by side by the experiment of primary circuit impedance
Processing, the primary circuit impedance of all-fiber current transformator wideband check system are up to minimum value, therefore, wideband of the invention
Check system can realize the ability of output 2500Hz primary current.
In embodiments of the present invention, it is contemplated that existing current feedback circuit load capacity is weak, reference frequency output is small,
Noise in output signal is big, it is difficult to realize high accuracy transmission of quantity value.Therefore, in embodiments of the present invention, check system selects
High current is provided with the technical solution of signal generator, power amplifier, broadband up-flow device, the current feedback circuit assembled
System load capacity is strong, and for reference frequency output greatly up to 50Hz~2500Hz, exportable multiple waveforms are suitable for full optical-fiber current
The check system of mutual inductor wideband measurement performance.
2 primary current impedance loop testing experiment of table
| Power frequency Hz | Loop voltage UV | Resistance drop mV | Phase angle difference ° | Loop current A |
| 50 | 0.39994 | 215.7 | 4.8 | 27.0 |
| 100 | 0.2003 | 106.99 | 9.52 | 13.4 |
| 200 | 0.2001 | 102.66 | 18.6 | 13.0 |
| 400 | 0.44843 | 200.6 | 34.04 | 25.4 |
| 800 | 0.62755 | 201.34 | 53.39 | 26.0 |
| 1600 | 1.08737 | 203.3 | 69.42 | 26.9 |
| 2500 | 1.58038 | 196.62 | 76.3 | 26.4 |
3 primary current impedance loop testing experiment (Continued) of table
4 multiple twin primary current impedance loop testing experiment of table
| Power frequency Hz | Loop voltage V | Resistance drop mV | Phase angle difference ° | Loop current A |
| 50 | 0.36609 | 202.8 | 2.67 | 25.4 |
| 100 | 0.36698 | 202.6 | 5.19 | 25.3 |
| 200 | 0.37792 | 205.9 | 10.05 | 25.8 |
| 400 | 0.38483 | 200.3 | 19.4 | 25.2 |
| 800 | 0.45698 | 205.6 | 34.73 | 26.1 |
| 1600 | 0.64123 | 205.0 | 53.3 | 26.5 |
| 2500 | 0.8930 | 205.9 | 63.56 | 26.9 |
5 multiple twin primary current impedance loop testing experiment (Continued) of table
| Power frequency Hz | Loop resistance m Ω | Circuit induction reactance m Ω | Loop inductance mH | Impedance loop m Ω |
| 50 | 14.42 | 0.67 | 0.0021 | 14.44 |
| 100 | 14.43 | 1.31 | 0.0021 | 14.49 |
| 200 | 14.44 | 2.56 | 0.0020 | 14.67 |
| 400 | 14.43 | 5.08 | 0.0020 | 15.30 |
| 800 | 14.41 | 9.99 | 0.0020 | 17.53 |
| 1600 | 14.47 | 19.42 | 0.0019 | 24.22 |
| 2500 | 14.76 | 29.69 | 0.0019 | 33.15 |
The type selecting of power amplifier is related with primary current impedance loop.By primary circuit impedance experiment measurement it is found that
The row conductor multiple twin processing as long as the area for reducing primary current circuit as far as possible is gone forward side by side, the verification of all-fiber current transformator wideband
The primary circuit impedance of system is up to minimum value 33.15m Ω.
The number of turns for the current output capability for making full use of power amplifier, current lifting device is designed as 8 circles, when secondary side current is
When 100A, current lifting device secondary circuit voltage is the product of loop current and impedance loop, and in 2500Hz, secondary circuit voltage is
3.3V, primary circuit voltage is 26.4V, electric current 12.5A at this time, and the power amplifier of 5kW can be selected.
800kV DC transmission system and ± 500kV flexible HVDC transmission system rated current are 3000A or so at present, according to
The 10% of electric current verifies in sighting target standard, and when electric current to be measured is 300A, taking sectional area of wire is 180mm2, by formula (1), (2)
Finally loop inductance L=1.37 × 10-3mH is obtained.Current lifting device secondary circuit impedance such as formula (4) is calculated:
Power frequency is 2500Hz, and considering that error takes primary current impedance loop is 25m Ω, when current lifting device exports 300A
When, the secondary single turn output voltage of current lifting device is 7.5V, then the first winding voltage of current lifting device is 60V, and once winding current is
37.5A.I.e. the output voltage of power amplifier is 60V, and output electric current is 37.5A, and the power amplifier of 5kW can be selected at this time.
1100kV DC transmission system rated current is between 5000-6000A at present, according to 10% of electric current in standard
Verification, when electric current to be measured be 600A when, take at this time sectional area of wire be 400mm2, by formula (1), (3) obtain loop inductance L=finally
9.62×10-4mH.Current lifting device secondary circuit impedance such as formula (4) is calculated: Z=15.385m Ω.
Power frequency is 2500Hz, and considering that error takes primary current impedance loop is 20m Ω, when current lifting device exports 600A
When, the secondary single turn output voltage of current lifting device is 12V, then the first winding voltage of current lifting device is 96V, once winding current 75A.
I.e. the output voltage of power amplifier is 96V, and output electric current is 75A, and the side of two 5kW power amplifier parallel connections can be selected at this time
Formula selects power for the power amplifier of 10kW.
In embodiments of the present invention, the power amplifier of this check system uses 7796 function of AE Techron company
Rate amplifier, it can provide the up to output voltage of 400Vrms, and (harmonic wave loses the THD of output signal within the scope of 20Hz-20kHz
It is sincere) less than 0.0015%.It can be worked using voltage or current-mode, and exportable is more than the power bracket of 5000W.It has
There are extremely low noise and quick slew rate, can safely drive various resistive inductive loads.
In embodiments of the present invention, signal generator uses the XL-221 single-phase dynamic waveform function of Xing Long scientific & technical corporation
Rate source, it can be with output single-phase combined-voltage and electric current, and exportable direct current, square wave, triangular wave, sine wave and superposition are most
High 129 harmonic waves also have waveform customization, the functions such as various types of waveform concatenation outputs.It can be used for needing complexity
The occasion of waveform signal output, such as mutual inductor detection, frequency analysis.When exporting AC signal, exportable 0.001-5KHz
Alternating voltage in frequency range, stability and precision can reach within 5/10000ths, can be used as standard AC voltage source.
Broadband up-flow device is for when verifying current transformer, as the supply power supply of current transformer primary current or other
50Hz single-phase current source equipment.Exportable electric current: 10A~120A allows long-term work under rated current, allows overload 1.5
Work 30 minutes again.
In embodiments of the present invention, select active wideband current mutual inductor as standard current transformer, frequency
Range is 50Hz~2500Hz, and class of accuracy is 0.002 grade, than the accuracy (0.2 grade) of tested all-fiber current transformator model machine
Low 2 orders of magnitude can meet verification and require, reach verification effect.
In embodiments of the present invention, data acquisition unit hardware selects the NI PXIe-1062Q machine of NI company production
Case, 8 scouring machine case of NI PXIe-1062Q are to test and measure application programming to be various, and high bandwidth backboard, which can provide, often to be inserted
Slot is up to the dedicated bandwidth of 1GB/s to meet high-efficiency operation needs.Its sampling precision is high simultaneously, strong antijamming capability, when work
Noise is low.
All-fiber current transformator is accessed into check system, input current is set as 100A (10% rated current), measures
The measurement result difference of its ratio difference and angular difference value in 50Hz-2500Hz frequency range is as shown in Figure 5 and Figure 6.
By measurement result it is found that within the scope of 50Hz-2500Hz, all-fiber current transformator model machine is than difference maximum value
0.52%, angular difference maximum value is 54 μ s, meets national standard " GB/T26216.1-2010 HVDC transmission system DC current
Measuring device part 1: electronic direct-current current measuring device " in regulation: fundamental wave and harmonic current for 50-1200Hz
Measurement, the amplitude error of electronic direct-current current measuring device are not to be exceeded 0.75%, and 500 μ s are not to be exceeded in phase angle error.In
Within the scope of 50-2500Hz, which is able to satisfy the requirement to all -fiber mutual inductor frequency response test accuracy.
Fig. 7 is according to embodiment of the present invention for carrying out the method 700 of wideband verification to all-fiber current transformator
Flow chart.As shown in fig. 7, embodiments of the present invention offer is used to carry out wideband verification to all-fiber current transformator
Method 700 obtains the calibration voltage signal and all -fiber of the output of standard mutual inductor unit since step 701, in step 701
Current transformer exports the first current magnitude information and the first current phase information.
Preferably, wherein the calibration voltage signal for obtaining the output of standard mutual inductor unit and full optical-fiber current are mutual
The first current magnitude information and the first current phase information of sensor output, comprising: signal generating unit occurrence frequency is adjustable
First voltage signal；Power amplification unit amplifies the first voltage signal, to obtain second voltage signal；Broadband up-flow device root
Corresponding first current signal is generated according to the second voltage signal；All-fiber current transformator is according to first current signal
Generate first current magnitude information and the first current phase information；Standard mutual inductor unit is according to first current signal
Generate calibration voltage signal.
In step 702, acquires first current magnitude information and the first current phase information and carry out merging treatment, with
Obtain digital signal.
In step 703, the digital signal is converted into TCP/IP signal.
In step 704, electric current in different frequency scope is obtained according to the calibration voltage signal and TCP/IP signal respectively
Ratio difference and angular difference value, with to the all-fiber current transformator carry out wideband verification.
Preferably, wherein described obtain in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
The ratio difference and angular difference value of electric current, to carry out wideband verification to the all-fiber current transformator, comprising:
Generate the signal that synchronizing clock signals export the standard mutual inductor unit and the all-fiber current transformator
It is synchronous；
According to first current magnitude information of TCP/IP signal acquisition and the first current phase information, according to the verification
Voltage signal obtains the second current magnitude information and the second current phase information；
First current magnitude information and the second current magnitude information are compared, to obtain in different frequency scope
The ratio difference of electric current；
First current phase information and the second current phase information are compared, to obtain in different frequency scope
Electric current angular difference value；And
Wideband verification is carried out to the all-fiber current transformator than difference and angular difference value according to described.
Preferably, wherein described carry out wideband school to the all-fiber current transformator than difference and angular difference value according to described
It tests, comprising: according to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to all -fiber
Current transformer carries out wideband verification.
The embodiment of the present invention for carrying out the method 700 of wideband verification and of the invention to all-fiber current transformator
The system 100 for carrying out wideband verification to all-fiber current transformator of another embodiment is corresponding, and details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (10)
1. a kind of system for carrying out wideband verification to all-fiber current transformator, which is characterized in that the system comprises:
Verifying power supply device, comprising: be sequentially connected and form the signal generating unit in primary current circuit, power amplification unit and
Broadband up-flow device, and series connection accesses standard mutual inductor unit and the full optical-fiber current mutual inductance in the primary current circuit respectively
Device, the verifying power supply device are used to pass through the standard mutual inductor unit output verification voltage signal；For by described complete
Optical fiber current mutual inductor exports the first current magnitude information and the first current phase information；
Merging module is acquired, is connected with the verifying power supply device, for acquiring first current magnitude information and first
Current phase information simultaneously carries out merging treatment, to obtain digital signal；
Protocol conversion module is connected, for the digital signal to be converted to TCP/IP signal with the acquisition merging module；
Correction verification module is connected with the verifying power supply device and protocol conversion module respectively, for according to the calibration voltage
Signal and TCP/IP signal obtain the ratio difference and angular difference value of electric current in different frequency scope respectively, to the full optical-fiber current
Mutual inductor carries out wideband verification.
2. system according to claim 1, which is characterized in that the signal generating unit, it is adjustable for occurrence frequency
First voltage signal；The power amplification unit, for amplifying the first voltage signal, to obtain second voltage signal；Institute
Broadband up-flow device is stated, for generating corresponding first current signal according to the second voltage signal；The full optical-fiber current is mutual
Sensor, for generating first current magnitude information and the first current phase information according to first current signal；It is described
Standard mutual inductor unit, for generating calibration voltage signal according to first current signal.
3. system according to claim 1, which is characterized in that the correction verification module includes: synchronization unit and processing unit,
The synchronization unit makes the standard mutual inductor unit and the full optical-fiber current mutual inductance for generating synchronizing clock signals
The signal of device output is synchronous；
The processing unit, for being believed according to first current magnitude information of TCP/IP signal acquisition and the first current phase
Breath, according to second current magnitude information of calibration voltage signal acquisition and the second current phase information, and it is electric by described first
Stream amplitude information and the second current magnitude information are compared, to obtain the ratio difference of electric current in different frequency scope；It will be described
First current phase information and the second current phase information are compared, to obtain the angular difference of the electric current in different frequency scope
Value carries out wideband verification to the all-fiber current transformator than difference and angular difference value according to described.
4. system according to claim 3, which is characterized in that the processing unit, according to described than difference and angular difference value
Wideband verification is carried out to the all-fiber current transformator, comprising:
According to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to the full optical-fiber current
Mutual inductor carries out wideband verification.
5. system according to claim 3, which is characterized in that the processing unit, comprising: digital signal processor, specially
With integrated circuit ASIC or on-site programmable gate array FPGA.
6. system according to claim 1, which is characterized in that the system also includes: memory module and wireless telecommunications mould
Block；The memory module includes: at least one read only memory ROM, random access memory ram, flash memory or electronics
Erasable Programmable Read Only Memory EPROM EEPROM, the wireless communication module include: wireless LAN communication equipment and/or movement
Communication network device, the wireless LAN communication equipment include: at least one of bluetooth, ZigBee and Wi-Fi communication；Institute
State mobile communication network device include: in 2G wireless communication chips, 3G wireless communication chips and 4G wireless communication chips at least
One.
7. a kind of method for carrying out wideband verification to all-fiber current transformator, which is characterized in that the described method includes:
Obtain the calibration voltage signal of standard mutual inductor unit output and the first electric current width of all-fiber current transformator output
Value information and the first current phase information；
It acquires first current magnitude information and the first current phase information and carries out merging treatment, to obtain digital signal；
The digital signal is converted into TCP/IP signal；
Obtain the ratio difference and angular difference of electric current in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
Value, to carry out wideband verification to the all-fiber current transformator.
8. the method according to the description of claim 7 is characterized in that the calibration voltage for obtaining the output of standard mutual inductor unit
Signal and the first current magnitude information and the first current phase information of all-fiber current transformator output, comprising:
The adjustable first voltage signal of signal generating unit occurrence frequency；
Power amplification unit amplifies the first voltage signal, to obtain second voltage signal；
Broadband up-flow device generates corresponding first current signal according to the second voltage signal；
All-fiber current transformator generates first current magnitude information and the first electric current phase according to first current signal
Position information；
Standard mutual inductor unit generates calibration voltage signal according to first current signal.
9. the method according to the description of claim 7 is characterized in that described according to the calibration voltage signal and TCP/IP signal
The ratio difference and angular difference value of electric current in different frequency scope are obtained, respectively to carry out wideband school to the all-fiber current transformator
It tests, comprising:
Generating synchronizing clock signals keeps the standard mutual inductor unit synchronous with the signal that the all-fiber current transformator exports；
According to first current magnitude information of TCP/IP signal acquisition and the first current phase information, according to the calibration voltage
The second current magnitude information of signal acquisition and the second current phase information；
First current magnitude information and the second current magnitude information are compared, to obtain electric current in different frequency scope
Ratio difference；
First current phase information and the second current phase information are compared, to obtain the electricity in different frequency scope
The angular difference value of stream；And
Wideband verification is carried out to the all-fiber current transformator than difference and angular difference value according to described.
10. according to the method described in claim 9, it is characterized in that, it is described according to described than difference and angular difference value to described complete
Optical fiber current mutual inductor carries out wideband verification, comprising:
According to the average value of the ratio difference of the electric current exported in the period of predetermined number and/or angular difference value to the full optical-fiber current
Mutual inductor carries out wideband verification.
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