CN104833941B - A kind of compatible analog amount and the DC mutual inductor verification instrument of digital quantity verifying function - Google Patents
A kind of compatible analog amount and the DC mutual inductor verification instrument of digital quantity verifying function Download PDFInfo
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Abstract
A kind of compatible analog amount and the DC mutual inductor verification instrument of digital quantity verifying function, tester includes main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, human-computer interaction module and the power module powered for corresponding module, and tester also includes following device interface：Clock sync cap, at least two analog input interfaces, at least one digital quantity input light network interface；Analog input interface is connected with analog input sampling module, digital quantity input light network interface is connected with digital quantity input parsing module, clock synchronization module is connected with clock sync cap, clock synchronization module is connected with main control module, the data that main control module sends to analog input sampling module and digital quantity input parsing module is further processed, and the data is activation handled well is shown to human-computer interaction module.Tester of the present invention not only can verify can to analog output type but also to digital quantity output type direct current instrument transformer.
Description
Technical field
The present invention relates to a kind of DC mutual inductor verification device, belong to HVDC transmission system fields of measurement, can be to defeated
Go out the direct current instrument transformer for analog quantity or digital quantity to be verified.
Background technology
In power system, D.C. high voltage transmission be mainly used in remote bulk power transmission, submarine cable power transmission and non-with
Contact between the AC system that step is run etc..Direct current instrument transformer is important measuring apparatus in DC transmission system, is system
Control and protection provide needed for measurement signal.The stability of the accuracy of direct current instrument transformer measurement and operation is to DC power transmission system
Monitoring, protection and the stable operation of system have important impact.Calibration test before direct current instrument transformer is installed and week
Phase calibration is to ensure that the indispensable work of DC transmission system safe operation.
At present, domestic conventional DC mutual inductor verification method is output and the standard direct current of the tested direct current instrument transformer of comparison
Error between the output of transformer.Tested direct current instrument transformer has analog output type and two kinds of digital quantity output type, standard straight
Current transformer generally is analog output type, existing DC mutual inductor verification instrument is used for be connected with tested direct current instrument transformer
Interface typically only have digital-quantity input interface or analog input interface it is impossible to take into account analog output type and digital output
The verifying function of type direct current instrument transformer.
Content of the invention
The technical problem to be solved is to provide one kind to have analog input interface and digital-quantity input interface concurrently
DC mutual inductor verification instrument, it, not only can be to analog output type but also can be to digital output used as a kind of calibration measurement system
Type direct current instrument transformer is verified.
The present invention solves above-mentioned technical problem and be employed technical scheme comprise that：A kind of compatible analog amount and digital quantity verification work(
The DC mutual inductor verification instrument of energy, described tester includes main control module, analog input sampling module, digital quantity input parsing
Module, clock synchronization module, human-computer interaction module and the power module powered for corresponding module, described tester also includes as follows
Device interface：Clock sync cap, at least two analog input interfaces, at least one digital quantity input light network interface；
Described analog input interface is connected with described analog input sampling module, by standard and analog output type quilt
The analog signalses of inspection direct current instrument transformer output are input to described analog input sampling module, described analog input sampling mould
The analog signalses of input are converted to and are sent to described main control module after digital signal by block, described digital quantity input light network interface with
Described digital quantity input parsing module is connected, and the digital information of tested for digital output type direct current instrument transformer output is input to
Described digital quantity inputs parsing module, and described digital quantity inputs parsing module and the digital information of input is parsed, will solve
To described main control module, described clock synchronization module is connected data is activation after analysis with described clock sync cap, will pass through
Described clock sync cap direct current instrument transformer tested with digital output type is connected, described clock synchronization module and described master control mould
Block is connected, and will pass through the sampling clock of analog input sampling module described in described master control module controls, and then makes digital quantity
The sampling clock of the tested direct current instrument transformer of output type, standard or analog output type direct current instrument transformer is synchronous, described main control module
The data that described analog input sampling module and described digital quantity input parsing module are sent is further processed, and
The data is activation handled well is shown to described human-computer interaction module.
It is mutual that described analog input interface includes standard DC voltage transformer analog input interface, standard DC current
Sensor analog input interface, tested DC voltage transformer analog input interface and tested DC current transformer analog quantity
Input interface.
Described analog input sampling module includes several input sample passages, the input of each input sample passage with
Each analog input interface corresponds and is connected, and described input sample passage is by signal conditioning circuit and double A/D sample circuit group
Become, the analog voltage of input or current signal are with high fidelity converted into voltage small-signal and supply described pair by described signal conditioning circuit
A/D sampling circuit samples, described double A/D sample circuit is made up of two A/D converters with different frequency characteristic, two A/
D transducer is connected with described signal conditioning circuit and described main control module respectively, and two A/D converters pass in described main control module
Synchronized sampling under the control of the clock sync signal sending, the voltage small-signal of described signal conditioning circuit output of sampling respectively low
Frequency range and Mid Frequency, and the digital signal that sampling is obtained is sent to described main control module.The present invention utilizes two different frequencies
The AD converter of characteristic, by AC and DC（Low frequency）Collection separate, thus realize the high accuracy of signal, wide scope are adopted
Sample.
Corresponding to each analog input interface, described signal conditioning circuit has following four types：
Signal conditioning circuit corresponding with described standard DC voltage transformer analog input interface, adjustable by intrinsic standoff ratio
Precision resistance division module and two voltage followers a, b constitute, the input of described precision resistance division module passes through institute
State voltage follower a to be connected with described standard DC voltage transformer analog input interface, outfan pass through described voltage with
It is connected with the double A/D sample circuit of input sample passage that it is located with device b；
Signal conditioning circuit corresponding with described standard DC current transformer analog input interface, by Zero flux mutual inductance
Device and high-accuracy resistance and voltage follower c are constituted, and the input of described Zero flux transformer is mutual with described standard DC current
Sensor analog input interface is connected, and the outfan of described Zero flux transformer is connected with the input of described high-accuracy resistance,
The outfan of described high-accuracy resistance is connected with the double A/D sample circuit of input sample passage that it is located；
Signal conditioning circuit corresponding with described tested DC voltage transformer analog input interface, by high-accuracy resistance
Bleeder circuit a and voltage follower d composition, the input of described high-accuracy resistor voltage divider circuit a and described tested DC voltage
Transformer analog input interface is connected, and outfan is connected with the double A/D sample circuit of input sample passage that it is located；
Signal conditioning circuit corresponding with described tested DC current transformer analog input interface, by high-accuracy resistance
Bleeder circuit b and voltage follower e composition, the input of described high-accuracy resistor voltage divider circuit b and described tested DC current
Transformer analog input interface is connected, and outfan is connected with the double A/D sample circuit of input sample passage that it is located.
In above-mentioned signal conditioning circuit, tested DC voltage, current transformer signal conditioning circuit structure essentially identical,
This is because tested DC voltage transformer and tested DC current transformer all export analog voltage signal.And standard unidirectional current
Difference between pressure transformer and tested DC voltage, the signal conditioning circuit of current transformer, is because straight compared to tested
Stream voltage, current transformer, the output voltage range ratio of standard DC voltage transformer is larger, and output impedance is higher.
Described main control module inputs what parsing module sent to described analog input sampling module and described digital quantity
Data is further processed, and specifically includes following steps：
1）Filtering
1.1）Low-band signal to sampling, carries out digital filtering by FIR low pass filter algorithm, filters useful signal
Fractional-sample value beyond frequency range；
1.2）Intermediate frequency segment signal to sampling, carries out digital filtering by FIR band filter algorithm, filters useful signal
Low frequency part beyond frequency range and the sampled value of HFS；
1.3）Digital quantity is inputted with the data after parsing module parsing, numeral filter is carried out by FIR band filter algorithm
Ripple, filters noise jamming；
2）It is further processed using correlation function delay in phases algorithm：
By standard direct current instrument transformer and tested direct current instrument transformer filtered discrete type digital signal be converted to sampled value and
The time domain radix of wherein one railway digital signal function is fixed in a domain by the digital signal function in sampling time, mobile
The time domain radix of another railway digital signal function, often moves a unit interval length, carries out once two digital signal functions and exist
Each cross-correlation calculation of the discrete serieses on time domain radix, cross-correlation numerical value shows two function Duplication highests when maximum, this
The time span of Shi Yidong is delay value, adjusts standard direct current instrument transformer according to described delay value or tested direct current instrument transformer is used
In the sampled value doing ratio difference, then calculate standard direct current instrument transformer and the ratio of tested direct current instrument transformer output is poor, so that through this
Error between the output of tested direct current instrument transformer that bright tester is obtained and the output of standard direct current instrument transformer is more accurate.
Described power module includes switch and increases income and precision voltage source module, and described precision voltage source module is by insulating power supply and height
Effect linear stabilized power supply is constituted, and described efficient linear regulated power supply is increased income with described switch by described insulating power supply and is connected, institute
State efficient linear regulated power supply to be connected with described analog input sampling module.Insulating power supply ensure that analog input sampling mould
The independence that block is powered, prevents other power supply disturbance, and efficient linear regulated power supply decreases the ripple of power supply it is ensured that can be simulation
Amount input sample module provides high-quality power supply.
Described clock sync cap is included for providing clock sync signal for the tested direct current instrument transformer of digital output type
Output clock sync cap and for receiving the input clock sync cap of external synchronization clock signal.As adopted combining unit
The instrument having clock synchronism output function Deng some or equipment, are the school of the present invention by the clock synchronization module of the present invention
Test instrument and digital quantity output type direct current instrument transformer provides synchronizing clock signals, thus the sampling clock realized inside and outside tester is same
Step.
The device interface of described tester also includes Man Machine Interface, and described human-computer interaction module is by described man-machine friendship
Mutually interface is connected with described main control module, and described human-computer interaction module employs embedded system scheme.Described digital quantity input
Parsing module is by message, protocol analysis Algorithm constitution.
Described main control module is made up of processor platform and bottom control program, and described processor platform is dsp processor,
Described digital quantity input parsing module is with described dsp processor as hardware platform.
Described clock synchronization module is that field programmable gate array is constituted by FPGA.
Compared with prior art, the present invention has the advantages that：1）The compatible analog output of tester of the present invention
Type and the verification of digital quantity output type direct current instrument transformer；
2）Tester of the present invention passes through double A/D sample circuit, carries out block sampling by frequency, not only enable to direct current and
The sampling with high precision of low frequency signal, moreover it is possible to take into account the part useful signal of Mid Frequency, makes tester of the present invention realize to signal
In high precision, wide scope sampling, is conducive to improving the certainty of measurement of tester；
3）Tester main control module of the present invention is sent out by inputting parsing module to analog input sampling module and digital quantity
The data sent calculates both again ratio after being further processed is poor, improves the certainty of measurement of tester；
4）Tester of the present invention realizes man-machine interaction by embedded system scheme, makes tester of the present invention also have volume
Little, portable the advantages of.
Brief description
The present invention is described in further detail with being embodied as example below in conjunction with the accompanying drawings：
Fig. 1 is the general frame of the present invention；
Fig. 2 is the interface framework of tester；
Fig. 3 is analog input sampling module part composition frame chart；
Fig. 4 is digital quantity parsing module FB(flow block)；
Fig. 5 is main control module composition frame chart；
Fig. 6 is clock synchronization module functional block diagram；
Fig. 7 is precision voltage source modular structure schematic block diagram.
Specific embodiment
As shown in Fig. 2 the device of the DC mutual inductor verification instrument of the compatible analog amount of the present invention and digital quantity verifying function
Interface includes power interface, Man Machine Interface, clock sync cap, analog input interface, digital quantity input light network interface.
DC mutual inductor verification instrument in the present embodiment includes 4 analog input interfaces, 2 digital quantity input light nets
Mouthful, 2 clock sync caps.
4 analog input interfaces are respectively standard DC voltage transformer analog input interface, standard DC current
Transformer analog input interface, tested DC voltage transformer analog input interface and the simulation of tested DC current transformer
Amount input interface, so as can compatible voltage and current analog output type direct current instrument transformer verification.
In 2 digital quantity input light network interfaces, one is arranged as spare interface.Digital quantity input light network interface is the quilt in Fig. 2
Inspection direct current instrument transformer digital quantity input optical port.
2 clock sync caps one are output clock sync cap, and one is input clock sync cap.Output clock
Sync cap is used for providing clock sync signal for the tested direct current instrument transformer of digital output type, and input clock sync cap is used for
Receive external synchronization clock signal.Tester of the present invention can be united by exporting synchronizing clock signals or reception synchronizing clock signals
The sampling clock of the tested direct current instrument transformer of one digital output type, standard or analog output type direct current instrument transformer and main control module
Clock signal.
Power interface is civil power 220 V input interface.Man Machine Interface is easy to and human-computer interaction module（Will hereinafter
Talk about）It is connected.
Fig. 1 is the theory diagram of the present invention, the compatible analog amount of the present invention and the direct current instrument transformer of digital quantity verifying function
Tester includes main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, power supply mould
Block and human-computer interaction module.
Analog input interface is connected with analog input sampling module, will be defeated to analog signalses such as voltage or current signal
Enter to analog input sampling module, the analog signalses of input are converted to and send out after digital signal by analog input sampling module
Deliver to main control module.Digital quantity input light network interface is connected with digital quantity input parsing module, and digital information is input to numeral
Amount input parsing module, digital quantity inputs parsing module and the digital information of input is parsed, and the data after parsing is sent out
The main control module sending.Human-computer interaction module is connected with main control module by Man Machine Interface, and main control module is to the letter sending
Number processed, and the data handled well such as assay etc. is shown by human-computer interaction module such as liquid crystal display screen.Clock is synchronous
Module is connected with clock sync cap and main control module.Clock synchronization module is exported by clock sync cap or receives clock together
Step signal, so that the clock of the tested direct current instrument transformer of digital output type and main control module is synchronous, then passes through main control module control
The sampling clock of molding analog quantity input sample module, to make the tested direct current instrument transformer of digital output type, standard or analog quantity
The sampling clock of output type direct current instrument transformer is synchronous.Power module includes Switching Power Supply and precision voltage source module, precision voltage source mould
Block is connected with analog input sampling module, provides the power supply of high-quality for analog input sampling module.
Fig. 3 is the theory diagram of analog input sampling module, as shown in figure 3, analog input sampling module includes 4 tunnels
Input sample passage, the input of each input sample passage is corresponded with each analog input interface and is connected.Input sample leads to
Road is made up of signal conditioning circuit and double A/D sample circuit.It is defeated that 4 road input sample passages are respectively standard DC voltage transformer
Enter sampling channel, standard DC current transformer input sample passage, the input of analog output type tested DC voltage transformer
Sampling channel, analog output type tested DC current transformer input sample passage.
The analog voltage of input or current signal are with high fidelity converted into A/D sample circuit and can sample by signal conditioning circuit
Small-signal：
The analog voltage signal of standard DC voltage transformer output is divided into voltage by high-accuracy electric resistance partial pressure module
Small-signal, because the output voltage range of standard DC voltage transformer is than larger：0 ~ 120V, output impedance is higher：It is about
10K is it is therefore desirable to do prime isolation using the voltage follower a of the high pressure amplifier composition of high input impedance, high-precision by switching
Cipher telegram hinders the intrinsic standoff ratio high terminal voltage of holding of division module and the sampling precision of lower terminal voltage, and the voltage small-signal after partial pressure is again
Exported to double A/D sample circuit by a voltage follower b；The intrinsic standoff ratio of high-accuracy electric resistance partial pressure module in the present embodiment
（I.e. 50：1/5：1 switching）It is to be realized by the switching of Control precision resistance by the DSP of main control module；
The analog current signal of standard DC current transformer output is turned after Zero flux transformer and high-accuracy resistance
Turn to voltage small-signal, export to double A/D sample circuit after a voltage follower c；
Tested DC voltage transformer and tested DC current transformer all export analog voltage signal, the mould that they export
Intend voltage signal and be divided into voltage small-signal through high-accuracy resistor voltage divider circuit a, b respectively, more respectively after voltage follower d, e
Export to respective double A/D sample circuit.
The ratio of precision of conventional, electric-resistance is relatively low, and usually 5% ~ 10%.The precision comparison of high-accuracy resistance is high, and some can reach
Ten thousand/, and degree of stability, temperature drift are smaller, the high-accuracy resistance of application, temperature drift in the present embodiment：1PPM, precision：0.1%,
The present invention can improve the precision of the voltage signal obtaining using high-accuracy resistance.
Double A/D sample circuit realizes synchronized sampling under the control of main control module DSP, and their sample frequency is defeated by DSP
The CLK clock going out determines, CLK clock is configured by DSP.By clock synchronization module synchronization main control module and digital quantity output type quilt
The clock of inspection direct current instrument transformer, then controlled the sample frequency of double A/D sample circuit by DSP, so that digital output type is tested
The sampling clock of direct current instrument transformer and standard or analog output type direct current instrument transformer is synchronous.
DSP controls the process of the sampling clock of double A/D sample circuit as follows：According to the tested direct current mutual inductance of digital output type
The nominal sampling number of device（Sampling number refers to every cycle sampled value number, and fundamental wave is power frequency 50HZ, and IEC 60044-8 marks
Quasi- regulation electronic current mutual inductor（ECT）/ electronics is voltage transformer（EVT）Nominal sampling frequency be 20 times, 40 times, 80
Again any one, the frequency of transformer is power frequency 50Hz, and corresponding sample frequency is 1KHz, 2.4KHz, 4KHz, i.e. corresponding point
Number is for 20,40,80 points）, arrange in DSP by human-computer interaction module, DSP controls CLK clock, realizes standard or simulation
Amount output type direct current instrument transformer is synchronous with the sampling clock of the tested direct current instrument transformer of digital output type.
Double A/D sample circuit includes two A/D converters, two A/D converters respectively with signal conditioning circuit and master
Control module is connected, and two A/D converters receive the clock sync signal startup A/D sampling of main control module transmission, two A/D respectively
Transducer has different frequency characteristics, be respectively used to sampled signal modulate circuit output the low-frequency range of voltage small-signal and in
Frequency range.The present invention utilizes the AD converter of two different frequency characteristics, by AC and DC（Low frequency）Collection separate.Low frequency A/
D transducer fully meets low-frequency sampling using the ADS1278,24 position conversion accuracy of TI company and requires.Low frequency A/D converter gathers
Below 5Hz useful signal the fractional-sample value beyond filtering useful signal frequency range with reference to FIR low pass filter algorithm, in
Frequency A/D converter adopts AD7608,18 conversion accuracies, and intermediate frequency A/D converter collection 50Hz-1200Hz useful signal simultaneously combines
FIR band filter algorithm filter useful signal frequency range outside low frequency part, HFS sampled value, using double A/D
The high accuracy to signal realized by sample circuit, wide scope gathers.The digital signal obtaining after A/D sampling is sent to main control module
Processed.
As shown in Fig. 3,5, main control module includes processor platform and bottom control program.Processor platform adopts ADI public
The double-nuclear DSP processor ADSP609 of department, and extend out the DDR isochronous memory of 128M and the asynchronous access Flash of 32M, it is tester
Powerful signal handling capacity is provided.Bottom control program is the control centre of whole processor platform, at main inclusion numeral
Adjustment method, abnormal information Processing Algorithm etc., carry out data exchange with host computer by serial ports, receive the control command of host computer simultaneously
Control hardware to realize associative operation, return the data message required for host computer.Abnormal information Processing Algorithm mainly prevents journey
Sequence runs house dog flying etc..Digital signal processing algorithm is mainly the digital signal to digital quantity parsing module gained and AD conversion
Digital signal afterwards carries out further optimization processing, and concrete processing method is：For the digital signal of direct current sampling gained, main
Control module carries out digital filtering by the FIR low pass filter algorithm running in dsp after receiving digital signal, filters further
Fall noise and interference；Digital signal for if sampling gained and digital quantity input the digital signal after parsing module parsing,
Carry out digital filtering by operating in the FIR band filter in DSP platform, filter noise jamming further.
The error of synchronized sampling time and the difference of A/D sample rate, all can lead to time delay so that standard direct current instrument transformer
Inconsistent with the sampling instant of tested direct current instrument transformer, the ratio difference ultimately resulting in tester output becomes big.Adopt for this present invention
Correlation function delay in phases algorithm is to improve the certainty of measurement of tester.
Algorithm principle is as follows：Discrete type digital signal by standard direct current instrument transformer and tested direct current instrument transformer sampling gained
Be converted to sampled value and the digital signal function in sampling time (discrete), due to two digital signal function relative time delay scope ratios
Less, therefore in such as 10 minutes, wherein one digital signal Functions in Time Domain radix can be fixed in a domain, such as fixing
10：00-10:10, another digital signal Functions in Time Domain radix moves, and another digital signal function equally takes adopting in 10 minutes
Sample data, the terminal in sampling time is 10：00-10:10 move left and right, and often move unit interval length and carry out once two
The cross-correlation calculation of discrete serieses, due to two examined functional dependences, even if in the presence of having noise, two function weights
The cross-correlation numerical value that during folded rate highest, it calculates is maximum, and the time span now moving is delay value.So movement
Unit interval length determines the precision of gained delay value, and the unit interval of movement is shorter, then amount of calculation is bigger, but the prolonging of gained
Duration error is less, conversely, the unit interval of movement is longer, then amount of calculation is less, but the delay value error of gained is bigger, because
This, need the length of the rational unit interval arranging movement, be allowed to both can to meet tester than poor precision, can control again
Amount of calculation processed.The length of described unit interval can with reference to tester, the requirement to precision determines by MATLAB emulation, thus
The sampled value obtaining more accurate time delay is done than difference.
Fig. 4 is digital quantity parsing module logical flow chart.Digital quantity parsing module be in main control module run message,
Protocol analysis algorithm, mainly parses to the proprietary protocol of IEC61850 message data and each producer, by IEC61850
The proprietary protocol of message and each producer resolves to discernible magnitude of voltage, current value, control signal etc..This algorithm with DSP is
Hardware platform, is conveniently extended, upgrades and calls.
Fig. 6 is the functional block diagram of clock synchronization module.Clock synchronization module is directly field-programmable gate array by FPGA
Row programming realization.It provides accurate pulse output using high capability flash type FPGA of ACTEL, can pass through gps clock
Source provides PPS pulse per second (PPS) and IRIG-B code synchronizing clock signals, it is possible to use when built-in high accuracy real-time clock provides synchronous
Clock signal, additionally can carry out clock timing by IEEE1588 agreement provides synchronised clock output, further simplifies
Synchronous function, and its timing error is less than 1us.Clock synchronization module realizes hardware markers using FPGA, when greatly being lifted
The synchronous accuracy of clock is so that the sample-synchronous error between standard direct current instrument transformer and tested direct current instrument transformer greatly reduces.
Clock synchronization module can also receive the PPS pulse per second (PPS) of outside as clock sync signal simultaneously.
Fig. 7 is the structured flowchart of precision voltage source module.The precision voltage source module of tester is by insulating power supply and efficient linear
Regulated power supply is constituted, and efficient linear regulated power supply is connected with Switching Power Supply by insulating power supply, efficient linear regulated power supply and mould
The signal conditioning circuit of analog quantity input sample module and double A/D sample circuit are respectively connected with.Insulating power supply ensure that analog quantity is defeated
Enter the independence that sampling module is powered, prevent other power supply disturbance.Insulating power supply is followed by efficient linear regulated power supply, decreases electricity
The ripple in source is it is ensured that high-quality power supply can be provided for analog input sampling module.The efficiency of normal linear regulated power supply
Very low, only 30%-40%, efficient linear regulated power supply compared to the efficiency high of normal linear regulated power supply, such as in the present embodiment
Efficient linear regulated power supply load regulation be less than 0.4%, line regulation be less than 0.2%, 10MA Ripple Suppression ratio at least
60dB, when being fully loaded with output, efficiency is up to 60%.
The human-computer interaction module of the tester of the present invention employs embedded system scheme and instead of work of the prior art
Control machine scheme, that is, control the program of display to operate on DSP, realizes human-computer interaction interface using embedded UI so that system is tied
Structure is compacter.Additionally, human-computer interaction module is shown using liquid crystal display screen, conveniently to parameters configuration and check results etc.
Checked.
Claims (8)
1. the DC mutual inductor verification instrument of a kind of compatible analog amount and digital quantity verifying function is it is characterised in that described tester
Including main control module, analog input sampling module, digital quantity input parsing module, clock synchronization module, human-computer interaction module
With the power module powered for corresponding module, described tester also includes following device interface：Clock sync cap, at least two
Analog input interface, at least one digital quantity input light network interface；
Described analog input interface is connected with described analog input sampling module, will be tested to standard and analog output type straight
The analog signalses of current transformer output are input to described analog input sampling module, and described analog input sampling module will
The analog signalses of input are sent to described main control module after being converted to digital signal, described digital quantity input light network interface with described
Digital quantity input parsing module is connected, and the digital information of tested for digital output type direct current instrument transformer output is input to described
Digital quantity inputs parsing module, and described digital quantity inputs parsing module and the digital information of input is parsed, after parsing
Data is activation to described main control module, described clock synchronization module is connected with described clock sync cap, described will pass through
Clock sync cap direct current instrument transformer tested with digital output type is connected, described clock synchronization module and described main control module phase
Even, will pass through the sampling clock of analog input sampling module described in described master control module controls, and then make digital output
The sampling clock of the tested direct current instrument transformer of type, standard or analog output type direct current instrument transformer is synchronous, and described main control module is to institute
State analog input sampling module and described digital quantity and input the data that parsing module sends and be further processed, and will locate
The data is activation managed shows to described human-computer interaction module；
Described analog input interface includes standard DC voltage transformer analog input interface, standard DC current transformer
Analog input interface, tested DC voltage transformer analog input interface and tested DC current transformer analog input
Interface；
Described analog input sampling module includes several input sample passages, the input of each input sample passage and each mould
Analog quantity input interface corresponds and is connected, and described input sample passage is made up of signal conditioning circuit and double A/D sample circuit, institute
State signal conditioning circuit the analog voltage of input or current signal are with high fidelity converted into voltage small-signal and adopt for described double A/D
Sample circuit sampling, described double A/D sample circuit is made up of two A/D converters with different frequency characteristic, two A/D conversions
Device is connected with described signal conditioning circuit and described main control module respectively, and two A/D converters transmit in described main control module
Synchronized sampling under the control of clock sync signal, the low-frequency range of the voltage small-signal of described signal conditioning circuit output of sampling respectively
And Mid Frequency, and the digital signal that sampling is obtained is sent to described main control module；
Corresponding to each analog input interface, described signal conditioning circuit has following four types：
Signal conditioning circuit corresponding with described standard DC voltage transformer analog input interface, by precision resistance partial pressure mould
Block and two voltage followers a, b are constituted, and the input of described precision resistance division module passes through described voltage follower a and institute
State standard DC voltage transformer analog input interface to be connected, outfan passes through described voltage follower b and input that it is located
The double A/D sample circuit of sampling channel is connected；
Signal conditioning circuit corresponding with described standard DC current transformer analog input interface, by Zero flux transformer and
High-accuracy resistance and voltage follower c composition, the input of described Zero flux transformer and described standard DC current transformer
Analog input interface is connected, and the outfan of described Zero flux transformer is connected with the input of described high-accuracy resistance, described
The outfan of high-accuracy resistance is connected with the double A/D sample circuit of input sample passage that it is located；
Signal conditioning circuit corresponding with described tested DC voltage transformer analog input interface, by high-accuracy electric resistance partial pressure
Circuit a and voltage follower d composition, the input of described high-accuracy resistor voltage divider circuit a and described tested DC voltage mutual inductance
Device analog input interface is connected, and outfan is connected with the double A/D sample circuit of input sample passage that it is located；
Signal conditioning circuit corresponding with described tested DC current transformer analog input interface, by high-accuracy electric resistance partial pressure
Circuit b and voltage follower e composition, the input of described high-accuracy resistor voltage divider circuit b and described tested DC current mutual inductance
Device analog input interface is connected, and outfan is connected with the double A/D sample circuit of input sample passage that it is located.
2. DC mutual inductor verification instrument according to claim 1 is it is characterised in that described power module includes Switching Power Supply
With precision voltage source module, described precision voltage source module is made up of insulating power supply and efficient linear regulated power supply, described efficient linear
Regulated power supply is connected with described Switching Power Supply by described insulating power supply, and described efficient linear regulated power supply is defeated with described analog quantity
Enter sampling module to be connected.
3. DC mutual inductor verification instrument according to claim 1 it is characterised in that described clock sync cap include for
There is provided the output clock sync cap of clock sync signal for the tested direct current instrument transformer of digital output type and be used for receiving outside
The input clock sync cap of synchronizing clock signals.
4. DC mutual inductor verification instrument according to claim 1 is it is characterised in that the device interface of described tester also wraps
Include Man Machine Interface, described human-computer interaction module is connected with described main control module by described Man Machine Interface, described people
Machine interactive module employs embedded system scheme.
5. DC mutual inductor verification instrument according to claim 1 it is characterised in that described digital quantity input parsing module by
Message, protocol analysis Algorithm constitution；Described main control module is made up of processor platform and bottom control program, and described processor is put down
Platform is dsp processor, and described digital quantity input parsing module is with described dsp processor as hardware platform.
6. DC mutual inductor verification instrument according to claim 1 is it is characterised in that described clock synchronization module by FPGA is
Field programmable gate array is constituted.
7. DC mutual inductor verification instrument according to claim 1 it is characterised in that with described standard DC voltage transformer
Described precision resistance division module in the corresponding signal conditioning circuit of analog input interface is the adjustable accurate electricity of intrinsic standoff ratio
Resistance division module.
8. DC mutual inductor verification instrument according to claim 1 is it is characterised in that described main control module is to described analog quantity
Input sample module and described digital quantity input the data that parsing module sends and are further processed, and specifically include following step
Suddenly：
1) filter
1.1) low-band signal to sampling, carries out digital filtering by FIR low pass filter algorithm, filters useful signal frequency
Fractional-sample value beyond scope；
1.2) the intermediate frequency segment signal to sampling, carries out digital filtering by FIR band filter algorithm, filters useful signal frequency
Low frequency part beyond scope and the sampled value of HFS；
1.3) digital quantity is inputted with the data after parsing module parsing, digital filtering is carried out by FIR band filter algorithm, filter
Fall noise jamming；
2) it is further processed using correlation function delay in phases algorithm：
Standard direct current instrument transformer and tested direct current instrument transformer filtered discrete type digital signal are converted to sampled value and sampling
The time domain radix of wherein one railway digital signal function is fixed in a domain by the digital signal function of time, and movement is another
The time domain radix of railway digital signal function, often moves a unit interval length, carries out once two digital signal functions respective
The cross-correlation calculation of the discrete serieses on time domain radix, cross-correlation numerical value shows two function Duplication highests, this time shift when maximum
Dynamic time span is delay value, adjusts standard direct current instrument transformer according to described delay value or tested direct current instrument transformer is used for doing
Ratio difference sampled value, then calculate standard direct current instrument transformer and tested direct current instrument transformer output ratio poor.
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| CN106772189B (en) * | 2016-11-18 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Synchronous calibration method and system for direct-current voltage transformer |
| CN106646321B (en) * | 2016-11-18 | 2023-10-27 | 云南电网有限责任公司电力科学研究院 | Synchronous calibration method and system for direct current transformer |
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