CN108845283A - A kind of three-phase tester of compatible electronic formula mutual inductor and traditional mutual inductor detection - Google Patents
A kind of three-phase tester of compatible electronic formula mutual inductor and traditional mutual inductor detection Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- 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 the three-phase tester of a kind of compatible electronic formula mutual inductor and traditional mutual inductor detection, the three-phase tester includes：Electromagnetic transformer tester and electronic transducer calibration instrument, device can accurately reflect the characteristic of electronic mutual inductor and traditional mutual inductor in the operating condition, compared with existing tester, the present invention can overcome single plane method there are inefficiency, repeatedly wiring the disadvantages of；Has many advantages, such as closer actual operating mode, good compatibility, detection system are high-efficient；So as to guarantee the fair and just of electrical energy measurement.
Description
Technical field
The present invention relates to transducer check fields, and in particular, to a kind of compatible electronic formula mutual inductor and traditional mutual inductor
The three-phase tester of detection.
Background technique
With the development of economy, specific gravity of the industrial expansion in the development of the national economy is increasingly unexpected.In order to accurately right
Electric energy is measured, and the investment of mutual inductor is more and more extensive.Currently, the conventional electromagnetic mutual inductor with iron core is in relay protection
It occupies an leading position in measurement.But with the construction of extra-high voltage, the transmission capacity of electric system and gradually mentioning for voltage class
Height, traditional electromagnetic transformer will appear itself and be difficult to the shortcomings that overcoming.Utilize photoelectron technology and optical fiber sensing technology
Electronic mutual inductor can overcome the shortcomings that traditional mutual inductor, thus electronic mutual inductor develops into a kind of inexorable trend.
But two kinds of mutual inductors but can not substitute completely each other, therefore, three-phase mutual inductor in the power system be broadly divided into tradition three
Phase mutual inductor and electronic three-phase mutual inductor.
As one of the key equipment that data in power grid acquire, the effect of electric power mutual-inductor seems particularly significant, main to wrap
It includes：1) cooperate with secondary side metering device, realize the accurate measurement of primary voltage, electric current；2) with secondary side protective relaying device
It matches, accurate protection and automatic control when realizing to electric network fault；3) electricity between primary equipment and secondary device is realized
Air bound is from guaranteeing the safety of secondary device and operator, and the high voltage of primary side, high current are converted to and are suitble to secondary set
Standby signal makes metering and relay protection standardization.Therefore, the quick-action in order to guarantee the accurate metering of system charge and protect
Property, it needs to examine and determine three-phase mutual inductor.
Existing distribution mutual inductor is run under the high voltage of three-phase, the actual condition of high current.Traditional single plane method
The problems such as it is complicated that there are wiring, and detection efficiency is low.This application provides one kind to be based on three-phase detection device, and can be simultaneously to electronics
Formula three-phase mutual inductor and electromagnetic type (tradition) three-phase mutual inductor are verified.
Summary of the invention
The present invention provides the three-phase tester of a kind of compatible electronic formula mutual inductor and traditional mutual inductor detection, the device energy
The characteristic of enough accurately reflection electronic mutual inductors and traditional mutual inductor in the operating condition, compared with existing tester, this hair
It is bright single plane method can be overcome there are inefficiency, repeatedly wiring the disadvantages of；With closer to actual operating mode, good compatibility,
The advantages that detection system is high-efficient；So as to guarantee the fair and just of electrical energy measurement.
For achieving the above object, it is detected this application provides a kind of compatible electronic formula mutual inductor and traditional mutual inductor
Three-phase tester, the three-phase tester include：
Electromagnetic transformer tester, including：Standard signal process circuit, measured signal process circuit, dsp controller,
Standard signal is produced all the way by generating two paths of signals after shift divider amplifier, program-controlled partial pressure, programming amplifying, low-pass filtering
Raw zero-crossing pulse signal gives dsp controller, another way by analog switch give after A/D conversion dsp controller handle,
Display；By trial signal by shift, amplifier, program-controlled partial pressure, programming amplifying, by low-pass filter circuit give analog switch into
Dsp controller processing display is finally given in row A/D conversion；
Electronic transducer calibration instrument, including：Phase-locking frequency multiplication circuit, synchronous circuit, two-stage programming amplifying, analog-to-digital conversion
Device, SCM system and serial communication；SCM system issues control A/D conversion command, realizes programmable gain amplifier
Range switching, and realize and communicate with host computer；Difference detection circuit is placed in inside industrial personal computer, is communicated by serial ports and host computer；
GPS issues clock signal, realizes the synchronized sampling of standard signal and difference signal；Synchronous circuit for realizing to input signal and
The output signal of pressure control oscillator carries out phase bit comparison, and the phase difference of two signals is kept constant, and realizes PGC demodulation；Difference inspection
It is poor that slowdown monitoring circuit first makees standard signal and measured signal, and before A/D conversion, standard signal and measured signal are made to the difference of difference
Value amplifies processing, and signal is made to be adjusted to be suitble to the optimal input range of A/D conversion.
Using the control of A/D conversion MAX and the switching to programmable amplifier gain, and the communication with host computer, use
AT89S52 single board computer verifies electronic mutual inductor analog output using differential technique, mutual to electronic type using direct method
The numeral output of sensor is verified.
Primary amplifier that further, the signal amplifier in electromagnetic transformer tester is connected by successively signal,
Intermediate amplifier and output amplifier composition, the primary amplifier, intermediate amplifier and output amplifier be respectively DJ409,
TLC2652 and OP07.
Further, the voltage changer in electromagnetic transformer tester includes：Resistance R1-51, resistance R2-52, fortune
Amplifier A53 is calculated, resistance R1-51 resistance value is 99k Ω, and accuracy 0.01%, resistance R2 resistance value is that 1k Ω accuracy is
0.01%, operational amplifier A53 use OPA277, THD+N 0.002%；
Power pack in electromagnetic transformer tester includes：Current transformer T1-61, resistance R3-62, operation are put
Big device A 63, the no-load voltage ratio of current transformer T1-61 are 5A/2mA, and accuracy 0.005%, resistance R2-62 resistance value is 500 Ω
Accuracy is 0.01%, and operational amplifier A53 uses OPA277, THD+N 0.002%.
Further, dsp controller by serial ports export control instruction to the serial ports of program-controlled voltage source on, control it is program-controlled
Voltage source output voltage drives the voltage standard mutual inductor with boosting that the voltage value of program-controlled voltage source is increased to primary voltage
Value, primary voltage are applied in the three-phase voltage of tested electronic type voltage transformer and the voltage standard mutual inductor with boosting simultaneously
The standard potential transformer in portion, the standard potential transformer PT 32 inside the voltage standard mutual inductor with boosting are exported and are accurately
A of the 0.02% quadratic transformation voltage a/x to voltage changer0/x0On, voltage changer output is linked into Channel Synchronous sampling
On the channel of A/D converter, the secondary output of the three-phase voltage of tested electronic type voltage transformer is linked into voltage-tracing and drive
In dynamic input, the output voltage of voltage-tracing and driving is linked on the channel of Channel Synchronous sampling A/D converter, and channel is same
The sampled value in step sampling A/D converter synchronized sampling channel, the amplitude error and phase error for calculating synchronized sampling channel are
The amplitude error and phase error of tested electronic type voltage transformer；Dsp controller exports control instruction by serial ports and is transferred to
On the serial ports of program-controlled voltage source, program-controlled voltage source output voltage is controlled, drives the current standard mutual inductor with up-flow program-controlled electric
Potential source current value up-flow be primary current value, primary current be applied to simultaneously terminal of tested electronic current mutual inductor with
Standard current transformer inside current standard mutual inductor with up-flow, with the standard electric inside the current standard mutual inductor flowed up
T of the accurate quadratic transformation electric current K1/K2 for being 0.02% of current transformer output to power pack0/TxOn, power pack is defeated
It is linked on the channel of Channel Synchronous sampling A/D converter out, is detected the secondary output of electronic current mutual inductor three-phase current
It is linked into the input of voltage-tracing and driving, the output voltage of voltage-tracing and driving is linked into Channel Synchronous sampling A/D and turns
On the channel of parallel operation, Channel Synchronous samples the sampled value in A/D converter synchronized sampling channel, calculates the width in synchronized sampling channel
Value error and phase error are the amplitude error and phase error of tested electronic current mutual inductor three-phase.
Further, synchronous circuit includes：Phaselocked loop, Schmidt trigger and operational amplifier, phaselocked loop for realizing
Difference signal sample frequency is to the real-time tracking of standard signal frequency, and Schmidt trigger is then by the sine wave variation of standard signal
At square-wave signal necessary to phase discriminator in phase locking unit；Operational amplifier is for putting the output signal of standard mutual inductor
Greatly；For phaselocked loop for realizing difference signal sample frequency to the real-time tracking of standard signal frequency, Schmidt trigger is used for will
The sine wave of standard signal is transformed into phase locking unit square-wave signal necessary to phase discriminator, and operational amplifier is used for standard mutual inductor
The output signal of device amplifies.
Further, operational amplifier uses LF356, and Schmidt trigger carries out shaping, lock to signal using CD4093
Phase ring is connected using CD4046 with frequency divider CD4060, and the 4th foot of CD4060 is connected with CD4046.
Further, two-stage programming amplifying includes：PGA204,PGA205；Its amplification factor is from 1 times to 8000 times；PGA increases
Beneficial shelf grade has 1,10,100, tetra- kinds of 1000V/V, and the gain shelf grade of PGA205 is 1,2,4, tetra- kinds of 8V/V；In view of difference is tested
The difference of signal and standard signal changes in a certain range, so needing to carry out different amplifications according to different differences
Processing.Programmable gain amplifier PGA204, PGA205 are able to satisfy this requirement.The two programmable gain amplifiers are ok
Digital selection is carried out to its gain with two TTL or CMOS logic signal A0, A1.PGA204 in the difference detection circuit used,
The gain of PGA205 is controlled by single-chip microcontroller according to the size of sampled signal.
Further, analog-digital converter MAX125.
One or more technical solution provided by the present application, has at least the following technical effects or advantages：
The present invention designs a set of compatible electronic formula and completely the three-phase tester of electromagnetic type；In view of three in Practical Project
It is combined mutual inductor, traditional single-phase mensuration not can accurately reflect the truth of mutual inductor, thus highly impact
The accuracy of electrical energy measurement；The present invention uses three-phase detection method, is applicable not only to traditional electromagnetic transformer, is also applied for electricity
Minor mutual inductor；Accuracy for electrical energy measurement in electric system has established solid foundation.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention；
Fig. 1 apparatus system schematic diagram；
Fig. 2 electronic transducer calibration instrument error-detecting catenation principle figure；
Fig. 3 traditional type mutual-inductor tester error-detecting catenation principle figure；
Fig. 4 phase-locked loop basic principle block diagram；
Fig. 5 synchronous circuit structure block diagram.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the case where not conflicting mutually, the application's
Feature in embodiment and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implemented with being different from the other modes being described herein in range using other, therefore, protection scope of the present invention is not by under
The limitation of specific embodiment disclosed in face.
Present apparatus major function is the three-phase whole detection being able to achieve to electronic mutual inductor, is also able to achieve to traditional electromagnetism
Formula mutual inductor three-phase whole detection.It is provided according to IEC60044-7/8 standard, the digital quantity of electronic mutual inductor output and simulation
Amount is required to, therefore the tester designed needs respectively to verify analog quantity and digital quantity with differential technique and direct method,
Its schematic diagram is as shown in Figure 1.It is illustrated below for the functional block diagram.
1) conventional electromagnetic mutual-inductor tester
Three-phase conventional electromagnetic mutual-inductor tester of the present invention mainly includes：I/V converter, signal amplifier are low
Pass filter, A/D converter, DSP, operation processing unit.The present invention is using DSP as data processing chip.Standard signal passes through
Shift gears divider amplifier, program-controlled partial pressure, programming amplifying, after low-pass filtering, generation zero-crossing pulse signal gives DSP all the way, one
DSP processing, display are given after carrying out A/D conversion by analog switch in road.By trial signal by shift, amplifier, it is program-controlled divide,
Programming amplifying gives analog switch by low-pass filter circuit and carries out A/D conversion, finally gives DSP processing display.
Signal amplifier is preferably made of primary amplifier, intermediate amplifier and output amplifier that successively signal connects,
The primary amplifier, intermediate amplifier and output amplifier are respectively DJ409, TLC2652 and OP07.
DJ409 chip is improved 8 tunnel/bis- 4 tunnel, CMOS analog multiplexer, and effect in the present system is to be used for
Collection of simulant signal makes output voltage and sampled voltage keep precise and stable multiplying power relationship by several high-precision resistance.
The control port of DJ409 connects digital signal, to play the function of selection enlargement ratio.TLC2652 is Texas Instruments
The high-precision chopping zero-stabilizing operational amplifier produced using advanced LinCMOS technique.The working method of chopper-zero-stabilized makes
TLC2652 has excellent DC characteristic, offset voltage and its drift, common-mode voltage, low-frequency noise, mains voltage variations etc. pair
The influence of operational amplifier has been lowered to minimum, and therefore, TLC2652 is highly suitable for the amplification of WeChat ID.OP07 chip
It is single operational amplifier integrated circuit of a kind of low noise, non-chopper-zero-stabilized.Since OP07 has low-down input imbalance electricity
Pressure, so OP07 does not need additional zeroing measure in many applications.OP07 has input bias current low simultaneously and opens
The characteristics of ring high gain, it is this it is low imbalance, high open-loop gain characteristic make measuring device of the OP07 especially suitable for high-gain
With the small-signal etc. of amplification sensor.
Dsp controller uses Ya De promise semiconductor ADSP-BF533DSP (Digital Signal Processing) chip.
Accurate voltage converter is by precision resistance R1-51, precision resistance R2-52 and high precision operating amplifier A53 group
At precision resistance R1-51 resistance value is 99k Ω, and accuracy 0.01%, precision resistance R2 resistance value is that 1k Ω accuracy is
It is 0.002% that 0.01%, high precision operating amplifier A53, which use OPA277, THD+N (total harmonic distortion plus noise),.
Precision current converter amplifies by precision current transformer T1-61, by precision resistance R3-62 and high-accuracy arithmetic
Device A 63 is formed, and the no-load voltage ratio of precision current transformer T1-61 is 5A/2mA, accuracy 0.005%, precision resistance R2-62 electricity
Resistance value is that 500 Ω accuracy are 0.01%, and using OPA277THD+N, (total harmonic distortion adds makes an uproar high precision operating amplifier A53
Sound) it is 0.002%.
Voltage-tracing and the chip of driving use high precision operating amplifier A7 to use OPA277THD+N (total harmonic distortion
Plus noise) it is 0.002%.
Dsp controller is exported in control instruction to the serial ports of program-controlled voltage source by serial ports, and control program-controlled voltage source is defeated
Voltage out drives the voltage standard mutual inductor with boosting that the voltage value of program-controlled voltage source is increased to primary voltage value, primary electricity
Pressure while the standard being applied to inside the three-phase voltage of tested electronic type voltage transformer and the voltage standard mutual inductor with boosting
Voltage transformer, exporting accurate with the standard potential transformer PT 32 inside the voltage standard mutual inductor to boost is 0.02%
Quadratic transformation voltage a/x to the present apparatus accurate voltage converter a0/x0On, the output of accurate voltage converter is linked into channel
On the channel of synchronized sampling AD converter, the secondary output of the three-phase voltage of tested electronic type voltage transformer be linked into voltage with
In the input of track and driving, the output voltage of voltage-tracing and driving is linked on the channel of Channel Synchronous oversampling A/D-converter,
The sampled value in Channel Synchronous oversampling A/D-converter synchronized sampling channel calculates synchronized sampling by fft algorithm and other algorithms
The amplitude error and phase error in channel are exactly the amplitude error and phase error of tested electronic type voltage transformer.DSP control
Device is exported in control instruction to the serial ports of program-controlled voltage source by serial ports, controls program-controlled voltage source output voltage, and driving band rises
The current standard mutual inductor of stream is primary current value the current value up-flow of program-controlled voltage source, and primary current is applied to tested simultaneously
Standard current transformer inside terminal of electronic current mutual inductor and current standard mutual inductor with up-flow, with up-flow
Standard current transformer inside current standard mutual inductor exports the accurate quadratic transformation electric current K1/K2 for being 0.02% to the present apparatus
Precision current converter T0/Tx on, precision current converter output is linked into Channel Synchronous sampling A/D converter channel
On, the secondary output of tested electronic current mutual inductor three-phase current is linked into the input of voltage-tracing and driving, voltage with
Track and the output voltage of driving are linked on the channel of Channel Synchronous sampling A/D converter, and it is same that Channel Synchronous samples A/D converter
The sampled value for walking sampling channel, calculates the amplitude error in synchronized sampling channel by fft algorithm and phase error is exactly tested
The amplitude error and phase error of electronic current mutual inductor three-phase.
AD converter can choose MAX125, and MAX125 is a kind of channel 2X4,14 high speeds, same that MAXIM company is released
When sampling and the successive approximation modulus conversion chip with parallel microcomputer interface.
2) electronic transducer calibration instrument
Three-phase electronic mutual-inductor tester of the present invention mainly includes：Phase-locking frequency multiplication circuit, synchronous circuit, two-stage journey
Control amplification, analog-digital converter, SCM system and serial communication.It can be individually to three-phase electronic voltage mutual inductor or three-phase electricity
Type current transformer is examined and determine, and can also be examined and determine electronic three-phase combination transformer.
The method of electronic mutual inductor analog output verification is selected first.Direct method in digit check method
Structure is simple, easy to make, and the data information amount for including is big, but needs high accuracy data collecting card, expensive；Difference
Value method is not high to the accuracy requirement of error of measurement device, and can realize based on data on the basis of by virtual instrument technology
Calculate, store, print etc..Cost is relatively low for the calibration equipment of differential technique development, is convenient for subsequent popularization, therefore uses differential technique to simulation
Amount is verified.The analog signal sampling of standard mutual inductor uses the data collecting card PCI4070 of NI company, is directly inserted in work
In peripheral device interface (PCI) slot of control machine.The capture card is no more than 0.05% to standard signal sampling relative error.And it is poor
Value detection circuit is then made of the part such as differential amplification, programmable automation controller, A/D conversion, phaselocked loop, single-chip microcontroller.Single-chip microcontroller
To issue the order of control A/D conversion, and realize the range switching of programmable gain amplifier, and logical with host computer realization
News.Difference detection circuit is placed in inside industrial personal computer, is communicated by serial ports and host computer.GPS issues clock signal and realizes standard letter
Number and difference signal synchronized sampling.
Direct method is used to the numeral output verification of electronic mutual inductor, i.e., by the output signal of standard mutual inductor through data
Capture card PCI4070 reads in host computer, and the digital output for being tested mutual inductor reads in host computer via network interface card from combining unit.Mould
Analog quantity and digital quantity verification are all based on Lab VIEW platform, are obtained using fft algorithm than difference and angular difference.
Phase-locking frequency multiplication circuit design：For sampled-data system, accuracy requirement is its key problem, and sampling side
Formula is then its key.Sample mode generally can be divided into asynchronous-sampling and synchronized sampling two major classes.Asynchronous-sampling keeps sampling frequency
Rate is constant, and the sample frequency takes the integral multiple of power frequency under normal circumstances.However, electric system is in the process of running, frequency is simultaneously
It is not fixed and invariable, it is possible to deviate.In the case, sample frequency and reference frequency are no longer integral multiple relations,
That is sampling pulse and input signal time location produce asynchronous.In this case, for accumulation type algorithm can bring compared with
Big error, so should not be used in the data acquisition higher occasion of accuracy requirement.Synchronized sampling can be divided into positioning again and adopt
Sample and tracking sampling two ways.Positioning sampling can remain that the ratio of sample frequency and reference frequency is integer, and adopt
Sampling point is always located in fundamental wave on pre-determined fixed position, i.e., sampling process and measured sinusoidal fundamental wave is tight to phase bit
Lattice are synchronous.But this mode will lead to hardware technology complication, and existing various algorithms do not require sampled point stringent yet
Positioning, therefore do not use.Tracking sampling only requires the variation of sample frequency tracking reference frequency, keeps sample frequency and reference frequency
Ratio be integer.Tracking synchronized sampling can eliminate general accumulation type algorithm and calculate mistake because of caused by fundamental wave fluctuation
Difference, to improve the accuracy of data collection system.This difference detection circuit uses the synchronous sampling method based on phaselocked loop.
Phase-locked loop basic principle block diagram such as Fig. 4.
Synchronous circuit：This difference detection circuit synchronous circuit is made of phaselocked loop, Schmidt trigger and operational amplifier.
Because being all by the same source output signal by school mutual inductor and standard mutual inductor, therefore the two frequency is equal.Then difference signal
Frequency and the frequency of standard signal are equal.Phaselocked loop can realize difference signal sample frequency to standard signal frequency it is real-time with
Track.And Schmidt trigger is then that the sine wave of standard signal is transformed into phase locking unit square-wave signal necessary to phase discriminator.
Operational amplifier is for amplifying the output signal of standard mutual inductor.Operational amplifier is using low drifting, high speed, high input
The LF356 of impedance, maximum feature is that input current is small, about the p A order of magnitude.Moreover, using this amplifier, in noise
Comparing with interference still can obtain relatively good bandwidth gain and signal-to-noise ratio under serious situation.Schmidt trigger uses
CD4093 carries out shaping to signal, and phaselocked loop is combined using CD4046 and frequency divider CD4060.Because in dynamic balancing,
CD4046 tracking is ultra-low frequency signal.This detection circuit reference frequency is 50Hz, should select N appropriate, make voltage controlled oscillator
Output it is as higher as possible, so as to reduce its output phase shake.We have selected the 4th foot of CD4060 to be connected with CD4046,
Signal is subjected to 64 frequencys multiplication.Synchronous circuit structure block diagram such as Fig. 5.
The design of two-stage programming amplifying：Difference detection circuit needs to make the difference standard signal and measured signal first.According to country
Standard, the analog output of electronic mutual inductor are not only one value, so we need to consider to simulate in different inputs
The possible size of difference in the case of amount.When inputting analog quantity rated value is 6.5V, standard signal and measured signal difference can
Can maximum value be：Δ U=6.5 × 2 × 2%=0.26 (V).When inputting analog quantity rated value is 22.5m V, difference signal
Possible minimum value is：Δ U=22.5 × 5% × 0.75%=8.4375 (μ V).In small signal system, wanted to meet precision
It asks, we are often desirable to the input energy of A/D close to its full scale value.So we first will before difference signal is sent into A/D
It is amplified, and signal is made to be adjusted to be suitble to the optimal input range of A/D conversion.Above with regard in the calculating of Δ U, can see
To for maximum difference it is desirable that at least being amplified 10 times, that is to say, that input difference signal minimum amplification factor be 10
Times, so we have selected the differential amplifier INA110KP for amplifying selection with multiple gains, and select to fix 10 multiplications
Beneficial shelves.Differential amplifier INA110KP internal gain have 1,10,100,200,500 totally 5 gears it is available；It is maximum non-linear
It is ± 0.01%；Maximum gain error is ± 0.1% when internal gain selects G=10.For the minimum value of difference signal, solid
Surely being amplified 8000 times after amplifying 10 times can meet the requirements.In view of the difference of different measured signals and standard signal be
Change in a certain range, so we need to carry out different enhanced processings according to different differences.Programmable automation controller
Device PGA204, PGA205 just meet this requirement well.Wherein, PGA204 gain shelf grade has 1,10,100,1000V/V tetra-
Kind, the gain shelf grade of PGA205 is 1,2,4, tetra- kinds of 8V/V.
The selection and application of analog-digital converter ADC：There are many type of analog-digital converter converter, by its working principle difference
Two class of direct A/D converter and indirect A/D converter can be divided into.Analog signal can be converted directly into number by direct A/D converter
Word signal, this kind of A/D converter have faster conversion speed, and typical circuit has parallel comparison A/D converter, gradually compares
Compared with type A/D converter.And A/D converter is then first to convert analog signals into a certain intermediate quantity (time or frequency) indirectly, so
Intermediate quantity is converted into digital output again afterwards.The speed of such A/D converter is slower, and typical circuit is that biproduct parting A/D turns
Parallel operation, voltage to frequency convert type A/D converter.First from required precision consider, we conversion accuracy should be selected relatively high by
Secondary comparison A/D converter.Secondly, sampling holder should be integrated with inside A/D converter.Because of discrete sampling holder essence
Spend lower, and the performance requirement of capacitor is very high to being not readily reachable by, so reducing this link undoubtedly can be improved entirety
Performance indicator.Moreover, because difference signal is smaller, it is relatively high to the resolution requirement of A/D converter.It is wanted according to above-mentioned
It asks, the analog-digital converter MAX125 that this difference detection circuit has selected U.S.'s Maxim to produce.MAX125 be a 36 pin,
At a high speed, 8 channels, 14 Data Acquisition System Chips.
SCM system and serial communication：It needs to realize the control to analog-digital converter MAX125 and programmable amplifier is increased
The switching of benefit, and the communication with host computer, calculation amount are not that very greatly, need to only realize certain control function, therefore use single
Piece machine AT89S52.The single-chip microcontroller is low-power consumption, and eight CMOS technology processors have 8K online programmable flash storage,
Flash can be programmed repeatedly in piece.AT89S52 is a powerful processor, can provide height for many Embedded Applications
Flexibility, high performance-price ratio solution.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. the three-phase tester of a kind of compatible electronic formula mutual inductor and traditional mutual inductor detection, which is characterized in that the three-phase school
Testing instrument includes：
Electromagnetic transformer tester, including：Standard signal process circuit, measured signal process circuit, dsp controller, standard
Signal was generated all the way by generating two paths of signals after shift divider amplifier, program-controlled partial pressure, programming amplifying, low-pass filtering
Zero pulse signal gives dsp controller, and another way is carried out giving dsp controller processing after A/D conversion, be shown by analog switch
Show；By trial signal by shift, amplifier, program-controlled partial pressure, programming amplifying, analog switch is given by low-pass filter circuit and is carried out
Dsp controller processing display is finally given in A/D conversion；
Electronic transducer calibration instrument, including：Phase-locking frequency multiplication circuit, synchronous circuit, two-stage programming amplifying, analog-digital converter, list
Piece machine system and serial communication；SCM system issues control A/D conversion command, realizes that the range of programmable gain amplifier is cut
It changes, and realizes and communicate with host computer；Difference detection circuit is placed in inside industrial personal computer, is communicated by serial ports and host computer；GPS is issued
Clock signal realizes the synchronized sampling of standard signal and difference signal；Synchronous circuit is for realizing to input signal and pressure control vibration
The output signal for swinging device carries out phase bit comparison, and the phase difference of two signals is kept constant, and realizes PGC demodulation；Difference detection circuit
It is poor to make first to standard signal and measured signal, and before A/D conversion, the difference that standard signal and measured signal make difference is carried out
Enhanced processing makes signal be adjusted to be suitble to the optimal input range of A/D conversion.
2. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
Be, primary amplifier that the signal amplifier in electromagnetic transformer tester is connected by successively signal, intermediate amplifier and
Output amplifier composition, the primary amplifier, intermediate amplifier and output amplifier be respectively DJ409, TLC2652 and
OP07。
3. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
It is, the voltage changer in electromagnetic transformer tester includes：Resistance R1-51, resistance R2-52, operational amplifier A53,
Resistance R1-51 resistance value is 99k Ω, and accuracy 0.01%, resistance R2 resistance value is that 1k Ω accuracy is 0.01%, and operation is put
Big device A53 uses OPA277, THD+N 0.002%；Power pack in electromagnetic transformer tester includes：Electric current
The no-load voltage ratio of mutual inductor T1-61, resistance R3-62, operational amplifier A 63, current transformer T1-61 are 5A/2mA, and accuracy is
0.005%, resistance R2-62 resistance value is that 500 Ω accuracy are 0.01%, and operational amplifier A53 is using OPA277, THD+N
0.002%.
4. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
It is, dsp controller is exported in control instruction to the serial ports of program-controlled voltage source by serial ports, control program-controlled voltage source output electricity
Pressure drives the voltage standard mutual inductor with boosting that the voltage value of program-controlled voltage source is increased to primary voltage value, and primary voltage is same
When be applied to normal voltage inside the three-phase voltage of tested electronic type voltage transformer and the voltage standard mutual inductor with boosting
Mutual inductor, the standard potential transformer PT 32 inside the voltage standard mutual inductor with boosting export it is accurate for 0.02% it is secondary
A of the voltage of transformation a/x to voltage changer0/x0On, voltage changer output is linked into the logical of Channel Synchronous sampling A/D converter
On road, the secondary output of the three-phase voltage of tested electronic type voltage transformer is linked into the input of voltage-tracing and driving, electricity
The output voltage of pressure tracking and driving is linked on the channel of Channel Synchronous sampling A/D converter, and Channel Synchronous samples A/D conversion
The sampled value in device synchronized sampling channel, the amplitude error and phase error for calculating synchronized sampling channel are tested electronic type voltage
The amplitude error and phase error of mutual inductor；Dsp controller exports the string that control instruction is transferred to program-controlled voltage source by serial ports
On mouth, program-controlled voltage source output voltage is controlled, drives the current standard mutual inductor with up-flow the current value liter of program-controlled voltage source
Stream is primary current value, and primary current is applied to terminal of tested electronic current mutual inductor and the electric current mark with up-flow simultaneously
Standard current transformer inside quasi- mutual inductor exports quasi- with the standard current transformer inside the current standard mutual inductor flowed up
T of the true quadratic transformation electric current K1/K2 for being 0.02% to power pack0/TxOn, it is same that power pack output is linked into channel
On the channel of step sampling A/D converter, the secondary output of tested electronic current mutual inductor three-phase current is linked into voltage-tracing
In the input of driving, the output voltage of voltage-tracing and driving is linked on the channel of Channel Synchronous sampling A/D converter, is led to
The sampled value in road synchronized sampling A/D converter synchronized sampling channel, the amplitude error and phase for calculating synchronized sampling channel miss
Difference is the amplitude error and phase error of tested electronic current mutual inductor three-phase.
5. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
It is, synchronous circuit includes：Phaselocked loop, Schmidt trigger and operational amplifier, phaselocked loop is for realizing difference signal sampling
The sine wave of standard signal is then changing into phase locking unit and reflects to the real-time tracking of standard signal frequency, Schmidt trigger by frequency
Square-wave signal necessary to phase device；Operational amplifier is for amplifying the output signal of standard mutual inductor；Phaselocked loop is used for
Difference signal sample frequency is realized to the real-time tracking of standard signal frequency, Schmidt trigger is used for the sine of standard signal
Wave conversion at square-wave signal necessary to phase discriminator in phase locking unit, operational amplifier be used for the output signal of standard mutual inductor into
Row amplification.
6. the three-phase tester of compatible electronic formula mutual inductor according to claim 5 and traditional mutual inductor detection, feature
It is, operational amplifier uses LF356, and Schmidt trigger carries out shaping to signal using CD4093, and phaselocked loop uses
CD4046 is connected with frequency divider CD4060, and the 4th foot of CD4060 is connected with CD4046.
7. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
It is, two-stage programming amplifying includes：PGA204,PGA205；Its amplification factor is from 1 times to 8000 times；PGA gain shelf grade has 1,
10,100, tetra- kinds of 1000V/V, the gain shelf grade of PGA205 are 1,2,4, tetra- kinds of 8V/V.
8. the three-phase tester of compatible electronic formula mutual inductor according to claim 1 and traditional mutual inductor detection, feature
It is, analog-digital converter MAX125.
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