CN110297203A - A kind of system and method for DC voltage transformer progress wideband verification - Google Patents
A kind of system and method for DC voltage transformer progress wideband verification Download PDFInfo
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- CN110297203A CN110297203A CN201910522030.1A CN201910522030A CN110297203A CN 110297203 A CN110297203 A CN 110297203A CN 201910522030 A CN201910522030 A CN 201910522030A CN 110297203 A CN110297203 A CN 110297203A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a kind of for carrying out the system and method for wideband verification to DC voltage transformer, 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 connected with the verifying power supply device, for merging processing to first current magnitude information and the first current phase information, to obtain digital signal；Protocol conversion module is connected with the merging module, for the digital signal to be converted to TCP/IP signal；Correction verification module, for obtaining the ratio difference and angular difference value of voltage in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal, to carry out wideband verification to the DC voltage transformer to be measured.The present invention can accurately be verified in the frequency range of 50Hz~3000Hz, in the amplitude range of 1kV-100kV to the wideband performance of DC voltage transformer DC voltage transformer to be measured, 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 direct current
Mutual inductor is pressed to carry out the system and method for wideband verification.
Background technique
DC voltage transformer is one-shot measurement equipment important in DC transmission system, is measurement, the control of direct current transportation
System and protection system provide measurement, protection and control signal.As HVDC transmission system continues to develop, a large amount of power electronics
Device and nonlinear load access power grid, lead to occur a large amount of higher hamonic waves in power grid.DC voltage transformer is to direct current transportation
Can the accuracy of measurement of harmonic voltage meet the requirements in system, be directly related to the safe and stable operation of DC transmission system.
It is provided in the multinomial standards such as GB/T26217-2010 " HVDC transmission system DC voltage measuring device ", DC voltage
Project should be verified comprising wideband accuracy of measurement in the type approval test and delivery test of mutual inductor, to examine DC voltage transformer
The technical indicator of harmonic voltage measurement accuracy.Relevant criterion requirement, amplitude of the DC voltage transformer in 50Hz~3000Hz
Error is not to be exceeded 1%, and phase angle error is not to be exceeded 500 μ s, and the wideband voltage magnitude that when verification applies should be higher than that 1kV.
However, existing wideband voltage source, frequency range can satisfy 50Hz~3000Hz requirement, and voltage magnitude is general
In 1kV hereinafter, voltage magnitude can satisfy 1kV requirements above, frequency is extremely difficult to 1000Hz or more again.On the other hand, by
It is FT3 digital quantity signal in DC voltage transformer output signal, but existing tester is generally only applicable to analog signals
The verification of the digital quantity signal of verification or 61850 agreement of IEC.The above two aspects reason, causes current DC voltage transformer in type
Wideband accuracy of measurement verifying work is not carried out by relevant criterion requirement in formula test and delivery test.
Therefore, it is necessary to a kind of DC voltage transformer check systems, are carried out with the wideband performance to DC voltage transformer
The problem of wideband verifies.
Summary of the invention
The present invention propose it is a kind of for DC voltage transformer carry out wideband verification system and method, with solve how
The problem of wideband verification is carried out to the wideband performance of DC voltage transformer.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided it is a kind of for DC voltage transformer
The system for carrying out wideband verification, which is characterized in that the system comprises:
Verifying power supply device, comprising: be sequentially connected and form the signal generating unit of voltage circuit, power amplification unit and
Broadband up-flow device, and the standard wideband voltage transformer in parallel for accessing the voltage circuit and DC voltage mutual inductance to be measured respectively
Device, the verifying power supply device is for passing through the standard wideband voltage transformer output verification voltage signal；For passing through
It states DC voltage transformer to be measured and exports the first current magnitude information and the first current phase information；
Merging module is connected with the verifying power supply device, for first current magnitude information and the first electricity
Stream phase information merges processing, to obtain digital signal；
Protocol conversion module is connected with the merging module, for the digital signal to be converted to TCP/IP 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 voltage in different frequency scope respectively, to described to be measured straight
It flows voltage transformer and 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 tertiary voltage signal；The DC voltage transformer to be measured, for being believed according to the tertiary voltage
Number generate first current magnitude information and the first current phase information；The standard wideband voltage transformer is used for basis
The tertiary voltage signal generates calibration voltage signal.
Preferably, wherein the correction verification module, comprising: synchronization unit and processing unit,
The synchronization unit makes the standard wideband voltage transformer and described to be measured straight for generating synchronizing clock signals
The signal for flowing voltage transformer 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 voltage 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 voltage in different frequency scope
Value carries out wideband verification to the DC voltage transformer to be measured 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 DC voltage mutual inductance to be measured
Device carries out wideband verification, comprising:
According to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to described to be measured straight
It flows voltage transformer and carries out wideband verification.
Preferably, wherein the wideband booster, comprising: primary coil, iron core and secondary coil, wherein primary coil
And/or secondary coil includes: multi-thread and rich enamel covered wire, current density 7.5A/mm2。
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 DC voltage transformer DC voltage mutual inductance to be measured
The method of device progress wideband verification, which is characterized in that the described method includes:
What the calibration voltage signal and DC voltage transformer to be measured of acquisition standard wideband voltage transformer output exported
First current magnitude information and the first current phase information；
Processing is merged to first current magnitude information and the first current phase information, to obtain digital signal；
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 voltage and
Angular difference value, to carry out wideband verification to the DC voltage transformer to be measured.
Preferably, wherein the calibration voltage signal and direct current to be measured of acquisition standard wideband voltage transformer output
The first current magnitude information and the first current phase information of voltage transformer 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 tertiary voltage signal according to the second voltage signal；
DC voltage transformer to be measured generates first current magnitude information and first according to the tertiary voltage signal
Current phase information；
Standard wideband voltage transformer generates calibration voltage signal according to the tertiary voltage 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 voltage, to carry out wideband verification to the DC voltage transformer to be measured, comprising:
Generating synchronizing clock signals makes the standard wideband voltage transformer and the DC voltage transformer output to be measured
Signal 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 voltage；
First current phase information and the second current phase information are compared, to obtain in different frequency scope
Voltage angular difference value；And
Wideband verification is carried out to the DC voltage transformer to be measured than difference and angular difference value according to described.
Preferably, wherein described carry out wideband to the DC voltage transformer to be measured than difference and angular difference value according to described
Verification, comprising:
According to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to described to be measured straight
It flows voltage transformer and carries out wideband verification.
The present invention provides a kind of for carrying out the system and method for wideband verification to DC voltage transformer, comprising: school
Electrical verification source device is used for output verification voltage signal, the first current magnitude information and the first current phase information；Merging module,
It is connected with the verifying power supply device, for being merged to first current magnitude information and the first current phase information
Processing, to obtain digital signal；Protocol conversion module is connected with the merging module, for converting the digital signal
For TCP/IP signal；Correction verification module is connected with the verifying power supply device and protocol conversion module respectively, for according to
Calibration voltage signal and TCP/IP signal obtain the ratio difference and angular difference value of voltage in different frequency scope respectively, with to it is described to
It surveys DC voltage transformer and carries out wideband verification.It is of the invention to be for carrying out wideband verification to DC voltage transformer to be measured
System can in the frequency range of 50Hz~3000Hz, in the amplitude range of 1kV-100kV to DC voltage transformer direct current to be measured
The wideband performance of voltage transformer is accurately verified, and checking precision is high, easy to operate, meets actual requirement of engineering, separately
There can also be directive significance to the selection of the verifying power supply device of different voltage transformer check systems outside.
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 the structure according to the system 100 for carrying out wideband verification to DC voltage transformer of embodiment of the present invention
Schematic diagram；
Fig. 2 is the example according to the system for carrying out wideband verification to DC voltage transformer of embodiment of the present invention
Figure；
Fig. 3 is to be carried out according to the impedance of the primary circuit to DC voltage transformer check system of embodiment of the present invention
The schematic diagram of test；
Fig. 4 is the result schematic diagram according to the ratio difference of the acquisition of embodiment of the present invention；
Fig. 5 is the result schematic diagram according to the angular difference value of the acquisition of embodiment of the present invention；And
Fig. 6 is the method 600 for carrying out wideband verification to DC voltage transformer according to embodiment of the present invention
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 the structure according to the system 100 for carrying out wideband verification to DC voltage transformer of embodiment of the present invention
Schematic diagram.As shown in Figure 1, the system for carrying out wideband verification to DC voltage transformer that embodiments of the present invention provide
Can in the frequency range of 50Hz~3000Hz, in the amplitude range of 1kV-100kV to DC voltage transformer direct current to be measured
The wideband performance of pressure mutual inductor is accurately verified, and checking precision is high, easy to operate, meets actual requirement of engineering, in addition
There can also be directive significance to the selection of the verifying power supply device of different voltage transformer check systems.Implementation of the invention
What mode provided is used to carry out DC voltage transformer the system 100 of wideband verification, comprising: verifying power supply device 101 merges
Module 102, protocol conversion module 103 and correction verification module 104.
Preferably, the verifying power supply device 101, comprising: be sequentially connected and form the signal generating unit of voltage circuit
1011, power amplification unit 1012 and broadband up-flow device 1013, and the standard wideband in parallel for accessing the voltage circuit respectively
Voltage transformer 1014 and DC voltage transformer to be measured 1015, the verifying power supply device are used for through the standard wideband electricity
Press mutual inductor output verification voltage signal；For by the DC voltage transformer to be measured export the first current magnitude information and
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 tertiary voltage signal according to the second voltage signal；The DC voltage transformer to be measured 1015, is used for
First current magnitude information and the first current phase information are generated according to the tertiary voltage signal；The standard wideband electricity
Mutual inductor 1014 is pressed, for generating calibration voltage signal according to the tertiary voltage signal.
Preferably, wherein the wideband booster, comprising: primary coil, iron core and secondary coil, wherein primary coil
And/or secondary coil includes: multi-thread and rich enamel covered wire, current density 7.5A/mm2。
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, the frequency range of current signal is 50Hz-3000Hz；Wherein, believe
Number generating unit, power amplification unit and broadband up-flow device form voltage circuit.Wherein, first voltage signal is low-voltage high-frequency electricity
Signal is pressed, second voltage signal is middle pressure high-frequency voltage signal, and the high voltage high frequency voltage that tertiary voltage signal is 1kV-100kV is believed
Number；Calibration voltage signal is low-voltage high-frequency voltage signal, and first winding the number of turns of broadband up-flow device is 31 circles, secondary winding the number of turns
For 2639 circles；It is 10A-120A that wideband booster, which exports electric current,.
The signal generating unit is single-phase dynamic waveform power source, and the signal of output includes direct current, square wave, triangle
The single-phase combined-voltage or electric current of wave, sine wave or superposition highest 129 times harmonic waves.The first electricity that signal generating unit generates
Pressure signal includes the alternating voltage in 0.001-5KHz frequency range.
In embodiments of the present invention, wideband booster includes primary coil, iron core and secondary coil, wherein primary
Coil and/or secondary coil include multi-thread and rich enamel covered wire, current density 7.5A/mm2.Wideband booster it is specified defeated
Enter power S=10000VA, calculates primary current
Imitate section；K is silicon steel sheet quality coefficient 1.25.Because silicon steel sheet is coated with exhausted line paint, and there are gaps between lamination, so actual iron
Core area is slightly larger than calculated value st.Then take st/kc=140cm2, in formula: kc is silicon steel sheet lamination coefficient, the choosing of this transformer
0.35mm thickness hot rolled silicon steel sheet, kc=0.89.It calculates each coil turn: since flux density and frequency are inversely proportional, calculating herein
When frequency f=50Hz, take Bm=1.5T, st=140cm2.Due to U1=4.44fN1Bmst, so N1=30.2, so N1 takes
31 circles.Corresponding N2 takes 2639 circles.Diameter of wire calculates: primary, secondary coil selection enamel covered wire, current density, J take
7.5A/mm2.Therefore the mode of parallel winding of multiple coils is used, to reduce line footpath.Here 3 lines are taken and around, primary wire diameter d, then
DC voltage transformer is because the advantage that its accuracy of measurement is high, dynamic range is big is widely used, but reality
The accuracy of DC voltage transformer is too low when measuring higher hamonic wave in operating condition, in order to adapt to current power system measuring more
The requirement of higher hamonic wave.DC voltage transformer wideband check system of the invention to the primary circuit impedance of wideband check system into
Analysis of having gone is tested, and power supply design is optimized, and the check system after optimization can accurately verify 50Hz~3000Hz frequency
The metering performance of DC voltage transformer within the scope of rate.
The power supply of check system as mutual inductor, power generator is to the stability of power supply, irregularity of wave form and makes an uproar
Sound requirement is very high, commonly realizes that large capacity Harmonic Current has the advantages that capacity is big using power electronic technique, but due to it
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, electricity
The shortcomings that source is not isolated with primary circuit.Therefore, the high-power Harmonic Current generator of embodiments of the present invention uses signal
The scheme of generator, power amplifier in conjunction with booster.Wherein, signal generator provides low distortion, frequency for power amplifier
The adjustable signal grade input of rate, power amplifier carry out power amplification, output voltage of the booster to power amplifier to signal
It is extended and voltage ratio standard is provided.Another effect of booster is to provide being isolated for power amplifier and primary circuit,
Eliminate the direct current biasing of power amplifier output.
Preferably, the merging module 102 is connected with the verifying power supply device 101, for first electric current
Amplitude information and the first current phase information merge processing, to obtain digital signal.
In embodiments of the present invention, digital signal is FT3 signal.
Preferably, the protocol conversion module 103 is connected with the merging module 102, is used for the digital signal
Be 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 voltage 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 DC voltage transformer to be measured.
Preferably, wherein the correction verification module 104, comprising: synchronization unit 1041 and processing unit 1042.
Preferably, the synchronization unit 1041 makes the standard wideband voltage transformer for generating synchronizing clock signals
It is synchronous with the signal of the DC voltage transformer output to be measured.
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 voltage in different frequency scope
Compare difference；First current phase information and the second current phase information are compared, to obtain in different frequency scope
Voltage angular difference value, wideband verification is carried out to the DC voltage transformer to be measured 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 DC voltage mutual inductance to be measured
Device carries out wideband verification, comprising:
According to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to described to be measured straight
It flows voltage transformer and carries out wideband verification.
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.
Fig. 2 is the example according to the system for carrying out wideband verification to DC voltage transformer of embodiment of the present invention
Figure.As shown in Fig. 2, in embodiments of the present invention, the system for carrying out wideband verification to DC voltage transformer includes:
It is sequentially connected and forms the signal generator, power amplifier and broadband up-flow device of voltage circuit, and access institute in parallel respectively
State the standard wideband voltage transformer and DC voltage transformer of voltage circuit；The signal generator, can for occurrence frequency
The first voltage signal of tune；The power amplifier, for amplifying the first voltage signal, to obtain second voltage signal；
The broadband up-flow device, for generating tertiary voltage signal according to the second voltage signal；The DC voltage transformer is used
According to tertiary voltage signal generation first current magnitude information and the first current phase information；The standard wideband
Voltage transformer, for generating calibration voltage signal according to the tertiary voltage signal.Merging module and DC voltage transformer
It is connected, for merging processing to first current magnitude information and the first current phase information, to obtain number letter
Number.Protocol conversion module is protocol converter, is connected with the merging module, for the digital signal to be converted to TCP/
IP signal.Correction verification module, comprising: synchronization unit and processing unit, processing unit, that is, DC voltage transformer tester.
When carrying out wideband verification, the synchronizing clock signals that synchronization unit generates make the standard wideband voltage transformer list
First synchronous with the signal of DC voltage transformer output, then DC voltage transformer tester is then according to the TCP/IP
The first current magnitude information of signal acquisition and the first current phase information, according to the second electric current of calibration voltage signal acquisition width
Value information and the second current phase information, and first current magnitude information and the second current magnitude information are compared,
To obtain the ratio difference of voltage in different frequency scope；First current phase information and the second current phase information are carried out
Compare, to obtain the angular difference value of the voltage in different frequency scope, according to it is described than difference and angular difference value to the DC voltage
Mutual inductor carries out wideband verification.
DC voltage transformer is because the advantage that its accuracy of measurement is high, dynamic range is big is widely used, but reality
The accuracy of DC voltage transformer is too low when measuring higher hamonic wave in operating condition, in order to adapt to current power system measuring more
The requirement of higher hamonic wave, the present invention have also carried out analysis test to the primary circuit impedance of DC voltage transformer check system,
The design of power supply device is optimized, the check system after optimization can accurately verify in 50Hz~3000Hz frequency range
The metering performance of DC voltage transformer.
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 3000Hz, 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
3000Hz.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 3000Hz, 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 3000Hz 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~3000Hz, 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 |
| 3000 | 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 |
| 3000 | 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 |
| 3000 | 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 3000Hz, 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 3000Hz, 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 3000Hz, 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.
When broadband up-flow device is used for calibration potential transformator, as the power supply of service voltage mutual inductor primary voltage or other
50Hz single-phase voltage source equipment allows long-term work under rated current, allows to overload 1.5 times and works 30 minutes.
In embodiments of the present invention, select active wideband voltage mutual inductor as standard potential transformer, frequency
Range is 50Hz~3000Hz, and class of accuracy is 0.002 grade, lower by 2 than the accuracy (0.2 grade) of DC voltage transformer model machine to be measured
A order of magnitude can meet verification and require, reach verification effect.
DC voltage transformer to be measured is accessed into check system, it is poor to measure its ratio in 50Hz-3000Hz frequency range
The measurement result of value and angular difference value difference is as shown in Figure 4 and Figure 5.
By measurement result it is found that within the scope of 50Hz-3000Hz, DC voltage transformer to be measured 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.?
Within the scope of 50-3000Hz, which is able to satisfy the requirement to DC voltage transformer frequency response test accuracy to be measured.
Fig. 6 is the method 600 for carrying out wideband verification to DC voltage transformer according to embodiment of the present invention
Flow chart.As shown in fig. 6, the method for carrying out wideband verification to DC voltage transformer that embodiments of the present invention provide
600 since step 601, obtains the calibration voltage signal of standard wideband voltage transformer output and to be measured straight in step 601
It flows voltage transformer and exports the first current magnitude information and the first current phase information.
Preferably, wherein the calibration voltage signal and direct current to be measured of acquisition standard wideband voltage transformer output
The first current magnitude information and the first current phase information of voltage transformer output, comprising: signal generating unit occurrence frequency
Adjustable first voltage signal；Power amplification unit amplifies the first voltage signal, to obtain second voltage signal；Wideband liter
It flows device and tertiary voltage signal is generated according to the second voltage signal；DC voltage transformer to be measured is believed according to the tertiary voltage
Number generate first current magnitude information and the first current phase information；Standard wideband voltage transformer is according to the third electricity
Signal is pressed to generate calibration voltage signal.
In step 602, processing is merged to first current magnitude information and the first current phase information, to obtain
Digital signal.
In step 603, the digital signal is converted into TCP/IP signal.
In step 604, voltage in different frequency scope is obtained according to the calibration voltage signal and TCP/IP signal respectively
Ratio difference and angular difference value, to carry out wideband verification to the DC voltage transformer to be measured.
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 voltage, to carry out wideband verification to the DC voltage transformer to be measured, comprising: generate synchronised clock
Signal keeps the standard wideband voltage transformer synchronous with the signal of the DC voltage transformer output to be measured；According to described
The first current magnitude information of TCP/IP signal acquisition and the first current phase information, according to the calibration voltage signal acquisition second
Current magnitude information and the second current phase information；First current magnitude information and the second current magnitude information are compared
Compared with to obtain the ratio difference of voltage in different frequency scope；By first current phase information and the second current phase information
It is compared, to obtain the angular difference value of the voltage in different frequency scope；And according to it is described than difference and angular difference value to described
DC voltage transformer to be measured carries out wideband verification.
Preferably, wherein described carry out wideband to the DC voltage transformer to be measured than difference and angular difference value according to described
Verification, comprising: according to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to described to be measured
DC voltage transformer carries out wideband verification.
The embodiment of the present invention for DC voltage transformer is carried out the method 600 of wideband verification with it is of the invention another
The system 100 for carrying out wideband verification to DC voltage transformer of one 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 DC voltage transformer, which is characterized in that the system comprises:
Verifying power supply device, comprising: be sequentially connected and form the signal generating unit, power amplification unit and wideband of voltage circuit
Current lifting device, and the standard wideband voltage transformer and DC voltage transformer to be measured in parallel for accessing the voltage circuit respectively,
The verifying power supply device is for passing through the standard wideband voltage transformer output verification voltage signal；For by it is described to
It surveys DC voltage transformer and exports the first current magnitude information and the first current phase information；
Merging module is connected with the verifying power supply device, for first current magnitude information and the first electric current phase
Position information merges processing, to obtain digital signal；
Protocol conversion module is connected with the merging module, for the digital signal to be converted to TCP/IP signal；
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 voltage in different frequency scope respectively, to the direct current to be measured
Mutual inductor is pressed to carry 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 tertiary voltage signal according to the second voltage signal；The DC voltage transformer to be measured,
For generating first current magnitude information and the first current phase information according to the tertiary voltage signal；The standard is wide
Frequency voltage transformer, for generating calibration voltage signal according to the tertiary voltage signal.
3. system according to claim 1, which is characterized in that the correction verification module, comprising: synchronization unit and processing are single
Member,
The synchronization unit makes the standard wideband voltage transformer and the direct current to be measured for generating synchronizing clock signals
Press the signal of mutual inductor output 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 voltage 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 voltage in different frequency scope
Value carries out wideband verification to the DC voltage transformer to be measured 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 DC voltage transformer to be measured, comprising:
According to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to the direct current to be measured
Mutual inductor is pressed to carry out wideband verification.
5. system according to claim 1, which is characterized in that the wideband booster, comprising: primary coil, iron core and
Secondary coil, wherein primary coil and/or secondary coil include: multi-thread and rich enamel covered wire, current density 7.5A/
mm2。
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 DC voltage transformer DC voltage transformer to be measured, feature exist
In, which comprises
The first of calibration voltage signal and DC voltage transformer to be measured output that acquisition standard wideband voltage transformer exports
Current magnitude information and the first current phase information；
Processing is merged to first current magnitude information and the first current phase information, to obtain digital signal；
The digital signal is converted into TCP/IP signal；
Obtain the ratio difference and angular difference of voltage in different frequency scope respectively according to the calibration voltage signal and TCP/IP signal
Value, to carry out wideband verification to the DC voltage transformer to be measured.
8. the method according to the description of claim 7 is characterized in that the verification of acquisition standard wideband voltage transformer output
Voltage signal and the first current magnitude information and the first current phase information of DC voltage transformer to be measured 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 tertiary voltage signal according to the second voltage signal；
DC voltage transformer to be measured generates first current magnitude information and the first electric current according to the tertiary voltage signal
Phase information；
Standard wideband voltage transformer generates calibration voltage signal according to the tertiary voltage 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 voltage in different frequency scope are obtained, respectively to carry out wideband to the DC voltage transformer to be measured
Verification, comprising:
Generating synchronizing clock signals makes the letter of the standard wideband voltage transformer and the DC voltage transformer output to be measured
Number synchronization；
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 voltage 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 pressure；And
Wideband verification is carried out to the DC voltage transformer to be measured 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 it is described than difference and angular difference value to it is described to
It surveys DC voltage transformer and carries out wideband verification, comprising:
According to the average value of the ratio difference of the voltage exported in the period of predetermined number and/or angular difference value to the direct current to be measured
Mutual inductor is pressed to carry out wideband verification.
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