CN106501751A - A kind of on-site testing device of current conversion station electronic mutual inductor and its method - Google Patents
A kind of on-site testing device of current conversion station electronic mutual inductor and its method Download PDFInfo
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- CN106501751A CN106501751A CN201611149763.8A CN201611149763A CN106501751A CN 106501751 A CN106501751 A CN 106501751A CN 201611149763 A CN201611149763 A CN 201611149763A CN 106501751 A CN106501751 A CN 106501751A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 238000010998 test method Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
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- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 3
- 238000010219 correlation analysis Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 14
- 230000005611 electricity Effects 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 5
- 238000002372 labelling Methods 0.000 description 3
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- 238000012545 processing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
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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 present invention is with regard to a kind of on-site testing device of current conversion station electronic mutual inductor and its method, including standard mutual inductor, tested transformer, small voltage transducer, A/D converter, CPU processor and synchrotimer, standard/tested the analogue signal obtained by standard under identical operating mode/tested transformer changes into standard/tested small voltage analogue signal without distortion by small voltage transducer, improve the accuracy of tested transformer measurement, live adaptability strengthens simultaneously, in addition, by CPU processor control time lock unit to standard/tested transformer and A/D converter, accomplish analog signalses and digital quantity signal time synchronization, and then realize the time synchronized of measurement.
Description
Technical field
A kind of the present invention relates to current conversion station electronic type mutual inductor on site technical field of measurement and test, more particularly to current conversion station electricity consumption
The on-site testing device of minor transformer and its method.
Background technology
Direct current transportation is that three-phase alternating current is become unidirectional current by current conversion station rectification, then is sent to by DC power transmission line
Another current conversion station is reverse into the power transmission mode of three-phase alternating current.For remote or overlength distance is transmitted electricity, compared to traditional
Ac transmission, direct current transportation are more economical efficiently.With direct current transportation greatly developing in the whole nation, the current conversion station of DC transmission system
Increasingly it is taken seriously with the on-the-spot test of electronic mutual inductor.And there is DC electronic current transformer, direct current in current conversion station
Electronic type voltage transformer, ac electronic type current transformer and ac electronic type voltage transformer, accurately to these current conversion stations
On-the-spot test is carried out with electronic mutual inductor, for the safe operation of direct current transportation significant.
In correlation technique, for the current conversion station electronic mutual inductor of DC transmission system, often entered using digital multimeter
Row on-the-spot test.Digital multimeter black meter pen is injected " com " hole first, red test pencil injects " V Ω " hole；Then according to being tested
Type selecting difference gear, wherein " V- " represent that DC voltage shelves, " V～" represent alternating voltage shelves, and " A " is current gear；Select again
Select the big range of compared estimate value to be measured and read data by dial plate；Finally the data for reading are used with corresponding inverter
Data in electronic mutual inductor are contrasted, and then inverter is judged with the accuracy of electronic mutual inductor.
But, in above-mentioned technical proposal, on the one hand, used with tested inverter by the measurement data for contrasting digital multimeter
The measurement data of electronic mutual inductor, and the accuracy of inverter electronic mutual inductor is judged with the two gap, this method
The accuracy of inverter electronic mutual inductor can only be qualitatively judged, and inverter electronic mutual inductor is embodied without standard measure
Accuracy；On the other hand, contrasted for the measurement data with digital multimeter is tested inverter electronic type mutual inductance
The real-time measuring data of device, the two existence time deviation, it is impossible to accomplish testing time synchronization.
Content of the invention
For overcoming problem present in correlation technique, the present invention to provide a kind of scene survey of current conversion station electronic mutual inductor
Examination devices and methods therefor.
A kind of first aspect according to embodiments of the present invention, there is provided the on-the-spot test dress of current conversion station electronic mutual inductor
Put, including standard mutual inductor, tested transformer, small voltage transducer, A/D converter, CPU processor and synchrotimer, its
In：The signal input part of the standard mutual inductor and tested transformer is connected with transmission pressure, the standard mutual inductor and quilt
The control signal for surveying transformer is connected with the outfan of the synchrotimer, the standard mutual inductor and tested transformer
Signal output part be connected with the input of the small voltage transducer；The outfan of the small voltage transducer and the A/
The signal input part connection of D transducers, the signal input part of the signal output part of the A/D converter and the CPU processor
Connection, the control output end of the CPU processor is connected with the input of the synchrotimer.
Preferably, described device also includes the first band filter and the second band filter, wherein：First band logical
The input of wave filter is connected with the outfan of the small voltage transducer, the outfan of first band filter with described
The signal input part connection of A/D converter；The input of second band filter and the signal output of the A/D converter
End connection, the outfan of second band filter are connected with the signal input part of the CPU processor.
Preferably, the signal output part of the standard mutual inductor and tested transformer is defeated with the small voltage transducer
Enter end to connect by Ethernet；The signal input part of the signal output part of the A/D converter and the CPU processor pass through with
Too net connection.
Preferably, the standard mutual inductor includes standard AC voltage transformer, standard AC current transformer, standard straight
Stream voltage transformer and standard DC current transformer；The tested transformer includes tested AC voltage transformer, by test cross
Stream current transformer, tested DC voltage transformer and measured DC transformer.
A kind of second aspect according to embodiments of the present invention, there is provided on-the-spot test side of current conversion station electronic mutual inductor
Method, comprises the following steps：Control time lock unit is by the time synchronized of standard mutual inductor, tested transformer and A/D converter；Adopt
The tested analogue signal of the standard analog signal and tested transformer of collection standard mutual inductor；By the standard analog signal and tested
Analogue signal changes into standard small voltage analogue signal and tested small voltage analogue signal by small voltage transducer respectively；By institute
State standard small voltage analogue signal and tested small voltage analogue signal respectively by A/D converter change into standardized digital signal and
Measured number signal；The standard DC digital signal of 100ms time spans and tested DC digital signal are carried out wavelet transformation
Decompose, and be calculated the ratio error of tested direct current instrument transformer；Standard AC digital signal and quilt by 100ms time spans
Test cross streaming digital signal carries out fast Fourier transform, and is calculated the ratio error and phase place mistake of tested D.C mutual-inductor
Difference.
Preferably, methods described also includes：According to the standardized digital signal and the waveform of measured number signal, phase is carried out
The analysis of closing property, polarity are veritified, a test is lost in the test of specified delay time and combining unit.
Preferably, described the standard analog signal and tested analogue signal are changed into by small voltage transducer respectively
Standard small voltage analogue signal and tested small voltage analogue signal, including：By the standard analog signal and tested analogue signal
Primary standard small voltage analogue signal and original tested small voltage analogue signal are changed into by small voltage transducer respectively；By institute
Primary standard small voltage analogue signal and original tested small voltage analogue signal are stated respectively by band filter, is filtered all of
High-frequency signal, obtains standard small voltage analogue signal and tested small voltage analogue signal.
Preferably, described the standard small voltage analogue signal and tested small voltage analogue signal are turned by A/D respectively
Parallel operation changes into standardized digital signal and measured number signal, including：By the standard small voltage analogue signal and tested little electricity
Pressure analogue signal changes into primary standard digital signal and original measured number signal by A/D converter respectively；By the original
Beginning standardized digital signal and original measured number signal by band filter, filter all of high-frequency signal, are marked respectively
Quasi- digital signal and measured number signal.
Preferably, the tested analogue signal of the standard analog signal and tested transformer of the collection standard mutual inductor, bag
Include：The tested analogue signal of the standard analog signal and tested transformer of collection standard mutual inductor；To the standard analog signal
It is marked with the acquisition time of tested analogue signal.
Preferably, described the standard small voltage analogue signal and tested small voltage analogue signal are turned by A/D respectively
Parallel operation changes into standardized digital signal and measured number signal, including：By the standard small voltage analogue signal and tested little electricity
Pressure analogue signal changes into standardized digital signal and measured number signal by A/D converter respectively；The standard digital is believed
Number and the transformation time of measured number signal be marked.
The technical scheme that embodiments of the invention are provided can include following beneficial effect：
The embodiment of the present invention provides a kind of on-site testing device of current conversion station electronic mutual inductor, wherein, test device
Including standard mutual inductor, tested transformer, small voltage transducer, A/D converter, CPU processor and synchrotimer, standard is mutual
The signal input part of sensor and tested transformer is connected with transmission pressure, outfan of the control signal with synchrotimer
Connection, signal output part are connected with the input of small voltage transducer；The outfan of small voltage transducer and A/D converter
Signal input part connects, and the signal output part of A/D converter is connected with the signal input part of CPU processor, the control of CPU processor
Outfan processed is connected with the input of synchrotimer.Above-mentioned current conversion station electronic mutual inductor provided in an embodiment of the present invention
On-site testing device, the standard/tested analogue signal obtained by standard under identical operating mode/tested transformer are changed by small voltage
Device changes into standard/tested small voltage analogue signal without distortion, improves the accuracy of tested transformer measurement, while live
Adaptability strengthens, in addition, being accomplished to standard/tested transformer and A/D converter by CPU processor control time lock unit
Analog signalses and digital quantity signal time synchronization, and then realize the time synchronized of measurement.
The embodiment of the present invention also provides a kind of on-the-spot test method of current conversion station electronic mutual inductor, including during control
Between lock unit by the time synchronized of standard mutual inductor, tested transformer and A/D converter；The standard analog of collection standard mutual inductor
Signal and the tested analogue signal of tested transformer；Standard analog signal and tested analogue signal are changed by small voltage respectively
Device changes into standard small voltage analogue signal and tested small voltage analogue signal；By standard small voltage analogue signal and tested little electricity
Pressure analogue signal changes into standardized digital signal and measured number signal by A/D converter respectively；By 100ms time spans
Standard DC digital signal and tested DC digital signal carry out wavelet transformation decomposition, and are calculated tested direct current instrument transformer
Ratio error；The standard AC digital signal of 100ms time spans and tested ac digital signal are carried out fast Fourier change
Change, and be calculated the ratio error and phase error of tested D.C mutual-inductor.Above-mentioned current conversion station provided in an embodiment of the present invention
With the on-the-spot test method of electronic mutual inductor, standard/tested analogue signal is changed into standard/tested small voltage analogue signal
To improve measurement accuracy and live adaptability, then standard/tested small voltage analogue signal is converted into standard/measured number letter
Number, last CPU processor carries out wavelet transformation to standard/measured number signal or fast Fourier transform is processed, by analysis
The quantitative analyses to tested transformer accuracy are realized with calculating；In addition, by CPU processor control time lock unit to mark
Standard/tested transformer and A/D converter, accomplish analog signalses and digital quantity signal time synchronization, so realize measurement when
Between synchronous.
It should be appreciated that above general description and detailed description hereinafter are only exemplary and explanatory, not
The present invention can be limited.
Description of the drawings
Accompanying drawing herein is merged in description and constitutes the part of this specification, shows the enforcement for meeting the present invention
Example, and the principle for being used for explaining the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is that a kind of structure of the on-site testing device of current conversion station electronic mutual inductor provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is the structure of the on-site testing device of another kind of current conversion station electronic mutual inductor provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is that the flow process of the on-the-spot test method of current conversion station electronic mutual inductor provided in an embodiment of the present invention is illustrated
Figure.
Illustrate：At the tested transformer of 1- standard mutual inductors, 2-, 3- small voltage transducers, 4-A/D transducers, 5-CPU
Reason device, 6- synchrotimers, the first band filters of 7-, the second band filters of 8-.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.Conversely, they be only with as appended by
The example of consistent apparatus and method in terms of some being described in detail in claims, of the invention.
Survey referring to the scene that Fig. 1 and Fig. 2, Fig. 1 are a kind of current conversion station electronic mutual inductor provided in an embodiment of the present invention
The structural representation that trial assembly is put, Fig. 2 are the scene survey of another kind of current conversion station electronic mutual inductor provided in an embodiment of the present invention
The structural representation that trial assembly is put.
Embodiment one
As shown in figure 1, the on-site testing device of the current conversion station electronic mutual inductor of the offer of the present embodiment one, including standard
Transformer 1, tested transformer 2, small voltage transducer 3, A/D converter 4, CPU processor 5 and synchrotimer 6, wherein：Mark
The signal input part of quasi- transformer 1 and tested transformer 2 is connected with transmission pressure, standard mutual inductor 1 and tested transformer 2
Control signal is connected with the outfan of synchrotimer 6, and the signal output part of standard mutual inductor 1 and tested transformer 2 is equal
It is connected with the input of small voltage transducer 3；The outfan of small voltage transducer 3 is connected with the signal input part of A/D converter 4
Connect, the signal output part of A/D converter 4 is connected with the signal input part of CPU processor 5, the control output end of CPU processor 5
It is connected with the input of synchrotimer 6.
During use, standard mutual inductor 1 and tested transformer 2 are each responsible for gathering standard analog signal and tested simulation letter
Number；And standard analog signal and tested analogue signal are reached small voltage transducer 3, and by small voltage transducer 3 without distortion
It is converted into standard small voltage analogue signal and tested small voltage analogue signal；Standard small voltage analogue signal and tested small voltage mould
Intend signal and reach A/D converter 4, and standardized digital signal and measured number signal are converted into by A/D converter 4；CPU processor
5 receive and process standardized digital signal and measured number signal, and measured number signal passes through contrast standard digital signal, you can right
The accuracy of tested transformer 2 is weighed and is judged.In addition, being so that standard/tested analogue signal and standard/measured number
Signals collecting time synchronized, especially through 5 control time lock unit of CPU processor 6 send synchronization pulse, and then complete right
The time synchronized of standard mutual inductor 1, tested transformer 2 and A/D converter 4, and to standard/tested analogue signal and standard/quilt
The acquisition time for surveying digital signal is marked.
Embodiment two
As shown in Fig. 2 the on-site testing device of the current conversion station electronic mutual inductor of the offer of the present embodiment two, including standard
Transformer 1, tested transformer 2, small voltage transducer 3, A/D converter 4, CPU processor 5, synchrotimer 6, the first band logical
Wave filter 7 and the second band filter 8, wherein：The signal input part of standard mutual inductor 1 and tested transformer 2 is led with transmission of electricity
Line connects, and the control signal of standard mutual inductor 1 and tested transformer 2 is connected with the outfan of synchrotimer 6, and standard is mutual
The signal output part of sensor 1 and tested transformer 2 is connected with the input of small voltage transducer 3；Small voltage transducer 3 defeated
Go out the input at end and the first band filter 7, the outfan of the first band filter 7 and the signal input part of A/D converter 4
Connection, the signal output part of A/D converter 4 is connected with the input of the second band filter 8, the second band filter 8 defeated
Go out end to be connected with the signal input part of CPU processor 5, the input of the control output end of CPU processor 5 and synchrotimer 6
Connection.
Specifically, input of the signal output part of standard mutual inductor 1 and tested transformer 2 with small voltage transducer 3
Connected by Ethernet；The signal output part of A/D converter 4 is connected by Ethernet with the signal input part of CPU processor 5.
Standard mutual inductor 1 includes standard AC voltage transformer, standard AC current transformer, standard DC voltage transformer and standard
DC current transformer；The tested transformer 2 includes tested AC voltage transformer, tested AC current transformer, tested
DC voltage transformer and measured DC transformer.
During use, standard mutual inductor 1 and tested transformer 2 are each responsible for gathering standard analog signal and tested simulation letter
Number；And standard analog signal and tested analogue signal are reached small voltage transducer 3 by Ethernet, and by small voltage transducer
3 are converted into standard small voltage analogue signal and tested small voltage analogue signal without distortion；Standard small voltage analogue signal and quilt
Survey small voltage analogue signal is filtered through the first band filter 7 and reaches A/D converter 4, and through A/D converter 4 and second
Band filter 8 is converted into standardized digital signal and measured number signal；CPU processor 5 is received and processes standardized digital signal
With measured number signal, measured number signal is by contrast standard digital signal, you can the accuracy of tested transformer 2 is carried out
Weigh and judge.In addition, being so that standard/tested analogue signal and standard/measured number signals collecting time synchronized, especially lead to
Cross 5 control time lock unit of CPU processor 6 and send synchronization pulse, and then complete to standard mutual inductor 1, tested transformer 2
With the time synchronized of A/D converter 4, and the acquisition time to standard/tested analogue signal with standard/measured number signal carries out
Labelling.
Further, small voltage transducer 3, the first band filter 7, A/D converter 4 and the second band filter 8 are equal
According to standard AC voltage transformer, standard AC current transformer, standard DC voltage transformer, standard direct current Current Mutual Inductance
Device, tested AC voltage transformer, tested AC current transformer, tested DC voltage transformer and measured DC mutual inductance
The difference of device, is obtained to sampled signal according to different frequencies and is processed.Wherein, A/D converters 4 have ethernet PHY
(Embedded programmable gate array embedded are compiled for (Physical Layer, physical layer) chip and EPGA
Journey gate array), and the characteristics of EPGA is real-time and I/O configurations are abundant is made full use of, completed by controlling ethernet PHY chip
Meeting for reception processing and meets the measured number signal of PT3 agreements at the measured number signal of IEC61850-9 agreements
(standard that IEC61850-9 agreements and PT3 agreements are IEC tissues committee's electronic mutual inductor and write).
Synchrotimer 6 mainly completed CPU processor 5 using CPLD-XC95288XL uniprocessors
The reception and process of IEEE1588 and IRIG-B code messages, and control to standard mutual inductor 1, tested transformer 2 and A/D converter
4 time synchronized.
The on-site testing device of the above-mentioned current conversion station electronic mutual inductor that the embodiment of the present invention one and embodiment two are provided,
Standard/tested the analogue signal obtained by standard under identical operating mode/tested transformer is turned without distortion by small voltage transducer
Chemical conversion standard/tested small voltage analogue signal, improves the accuracy of tested transformer measurement, while live adaptability strengthens,
In addition, by CPU processor control time lock unit to standard/tested transformer and A/D converter, accomplish analog signalses and
Digital quantity signal time synchronized, and then realize the time synchronized of measurement.
Referring to Fig. 3, Fig. 3 is the stream of the on-the-spot test method of current conversion station electronic mutual inductor provided in an embodiment of the present invention
Journey schematic diagram.
As shown in figure 3, the step of the on-the-spot test method of current conversion station electronic mutual inductor provided in an embodiment of the present invention
Including：
Step S110, control time lock unit is by the time synchronized of standard mutual inductor, tested transformer and A/D converter.
Realize that standard/tested transformer is controlled with synchrotimer gathers standard/tested analogue signal by sending synchronization pulse
The time synchronized of digital signal is gathered with A/D converter.
Step S120, gathers the tested analogue signal of the standard analog signal and tested transformer of standard mutual inductor.Specifically
Ground, is the acquisition time of labelling standard/tested analogue signal, and step S120 includes：
Step S121, gathers the tested analogue signal of the standard analog signal and tested transformer of standard mutual inductor.
Step S122, is marked to the acquisition time of standard analog signal and tested analogue signal.
Standard analog signal and tested analogue signal are changed into standard by small voltage transducer little by step S130 respectively
Voltage analog signal and tested small voltage analogue signal.Standard analog signal and tested analogue signal are respectively by built-in high accuracy
The small voltage transducer of resistance, and standard small voltage analogue signal and tested little electricity are converted into without distortion by small voltage transducer
Pressure analogue signal, improves certainty of measurement and live adaptive purpose to reach.For preventing the interference of high-frequency signal, increase filtering
Process, therefore, step S130 includes：
Step S131, standard analog signal and tested analogue signal change into primary standard by small voltage transducer respectively
Small voltage analogue signal and original tested small voltage analogue signal.
Primary standard small voltage analogue signal and original tested small voltage analogue signal are passed through band logical by step S132 respectively
Wave filter, filters all of high-frequency signal, obtains standard small voltage analogue signal and tested small voltage analogue signal.
Step S140, standard small voltage analogue signal and tested small voltage analogue signal are turned by A/D converter respectively
Chemical conversion standardized digital signal and measured number signal.For preventing the interference of high-frequency signal, increase Filtering Processing, therefore, step
S140 includes：
Step S141, standard small voltage analogue signal and tested small voltage analogue signal are turned by A/D converter respectively
Chemical conversion primary standard digital signal and original measured number signal；
Step S142, by primary standard digital signal and original measured number signal respectively by band filter, filters
All of high-frequency signal, obtains standardized digital signal and measured number signal.
For the acquisition time of labelling standard/tested analogue signal, step S140 includes：
Step S143, standard small voltage analogue signal and tested small voltage analogue signal are turned by A/D converter respectively
Chemical conversion standardized digital signal and measured number signal；
S144, is marked to the transformation time of standardized digital signal and measured number signal.
The standard DC digital signal of 100ms time spans and tested DC digital signal are carried out small echo by step S150
Conversion is decomposed, and is calculated the ratio error of tested direct current instrument transformer.
Specifically, in order to eliminate outside electromagnetic interference, by the standard of standard/be aligned current transformer 100ms time spans/
Wavelet transformation decomposition is carried out by school digital signal, the signal of peak low band is decomposed to, to obtain real DC component, finally
Calculate the ratio error for being aligned current transformer.For example, the frequency acquisition of tested DC digital signal is 6.4kHz, using containing
The wavelet coefficient of DC component frequency band asks for DC quantity, for accurately extracting DC quantity, using db4 small echos by tested DC digital
Signal carries out 8 layers of wavelet decomposition, chooses the frequency band that DC component is located, and frequency range is asked for directly in the a0 wavelet coefficients of 0-25Hz
Flow component, carries out meansigma methodss after specially all tested DC digital signal summations, again it is possible thereby to it is mutual to calculate tested direct current
DC component A1 of sensor；As the frequency acquisition of tested DC digital signal is 6.4kHz, therefore, standard DC digital signal
Also need to carry out 8 layers of wavelet decomposition, choose the frequency band that DC component is located, frequency range is asked for directly in the a0 wavelet coefficients of 0-25Hz
Flow component, carries out meansigma methodss after specially all discrete signal summations, again it is possible thereby to calculate the straight of standard direct current instrument transformer
Flow component A2, finally calculates the ratio error of tested direct current instrument transformer.
Step S160, the standard AC digital signal of 100ms time spans and tested ac digital signal are carried out quickly
Fourier transformation, and it is calculated the ratio error and phase error of tested D.C mutual-inductor.With S150 specific implementation process classes
Seemingly, will not be described here.
For further improving the test to tested transformer accuracy, the embodiment of the present invention is in above-mentioned steps S110 to step
Also include step S170 on the basis of S160：
Step S170, according to standardized digital signal and the waveform of measured number signal, carries out correlation analysiss, polarity core
Test, a test is lost in the test of specified delay time and combining unit.
The on-the-spot test method of above-mentioned current conversion station electronic mutual inductor provided in an embodiment of the present invention, by standard/tested
Analogue signal changes into standard/tested small voltage analogue signal to improve measurement accuracy and live adaptability, then by standard/quilt
Survey small voltage analogue signal and be converted into standard/measured number signal, finally standard/measured number signal is entered with CPU processor
Row analysis and calculating, realize the quantitative analyses to tested transformer accuracy；In addition, passing through CPU processor control time synchronization
Device accomplishes analog signalses and digital quantity signal time synchronization to standard/tested transformer and A/D converter, and then realizes surveying
The time synchronized of amount.
Those skilled in the art will readily occur to its of the present invention after considering description and putting into practice disclosure of the invention here
Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and
And various modifications and changes can carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a kind of on-site testing device of current conversion station electronic mutual inductor, it is characterised in that including standard mutual inductor (1), quilt
Transformer (2), small voltage transducer (3), A/D converter (4), CPU processor (5) and synchrotimer (6) is surveyed, wherein：
The signal input part of standard mutual inductor (1) and tested transformer (2) is connected with transmission pressure, the standard mutual inductor
The control signal of device (1) and tested transformer (2) is connected with the outfan of the synchrotimer (6), and the standard is mutual
The signal output part of sensor (1) and tested transformer (2) is connected with the input of small voltage transducer (3)；
The outfan of small voltage transducer (3) is connected with the signal input part of the A/D converter (4), the A/D conversions
The signal output part of device (4) is connected with the signal input part of the CPU processor (5), and the control of CPU processor (5) is defeated
Go out end to be connected with the input of the synchrotimer (6).
2. the on-site testing device of current conversion station electronic mutual inductor according to claim 1, it is characterised in that the dress
Put, wherein：
The input of the first band filter (7) is connected with the outfan of small voltage transducer (3), the first band
The outfan of bandpass filter (7) is connected with the signal input part of the A/D converter (4)；
The input of the second band filter (8) is connected with the signal output part of the A/D converter (4), and described second
The outfan of band filter (8) is connected with the signal input part of the CPU processor (6).
3. the on-site testing device of current conversion station transformer according to claim 1, it is characterised in that the standard mutual inductor
The signal output part of device (1) and tested transformer (2) is connected by Ethernet with the input of small voltage transducer (3)
Connect；The signal output part of A/D converter (4) is connected by Ethernet with the signal input part of the CPU processor (5).
4. the on-site testing device of current conversion station electronic mutual inductor according to claim 1, it is characterised in that the mark
Quasi- transformer (1) includes standard AC voltage transformer, standard AC current transformer, standard DC voltage transformer and standard
DC current transformer；Described tested transformer (2) include tested AC voltage transformer, tested AC current transformer, quilt
Survey DC voltage transformer and measured DC transformer.
5. a kind of on-the-spot test method of current conversion station electronic mutual inductor, it is characterised in that comprise the following steps：
Control time lock unit is by the time synchronized of standard mutual inductor, tested transformer and A/D converter；
The tested analogue signal of the standard analog signal and tested transformer of collection standard mutual inductor；
The standard analog signal and tested analogue signal are changed into the simulation of standard small voltage by small voltage transducer respectively
Signal and tested small voltage analogue signal；
The standard small voltage analogue signal and tested small voltage analogue signal are changed into criterion numeral by A/D converter respectively
Word signal and measured number signal；
The standard DC digital signal of 100ms time spans and tested DC digital signal are carried out wavelet transformation decomposition, and is counted
Calculate the ratio error for obtaining tested direct current instrument transformer；
The standard AC digital signal of 100ms time spans and tested ac digital signal are carried out fast Fourier transform, and
It is calculated the ratio error and phase error of tested D.C mutual-inductor.
6. the on-the-spot test method of current conversion station electronic mutual inductor according to claim 5, it is characterised in that the side
Method also includes：
According to the standardized digital signal and the waveform of measured number signal, correlation analysiss, polarity veritification, specified time delay is carried out
Time test and combining unit lose a test.
7. the on-the-spot test method of current conversion station electronic mutual inductor according to claim 5, it is characterised in that described will
The standard analog signal and tested analogue signal respectively by small voltage transducer change into standard small voltage analogue signal and
Tested small voltage analogue signal, including：
The standard analog signal and tested analogue signal are changed into primary standard small voltage by small voltage transducer respectively
Analogue signal and original tested small voltage analogue signal；
By the primary standard small voltage analogue signal and original tested small voltage analogue signal respectively by band filter, filter
Fall all of high-frequency signal, obtain standard small voltage analogue signal and tested small voltage analogue signal.
8. the on-the-spot test method of current conversion station electronic mutual inductor according to claim 5, it is characterised in that described will
The standard small voltage analogue signal and tested small voltage analogue signal change into standardized digital signal by A/D converter respectively
With measured number signal, including：
The standard small voltage analogue signal and tested small voltage analogue signal are changed into original mark by A/D converter respectively
Quasi- digital signal and original measured number signal；
By the primary standard digital signal and original measured number signal respectively by band filter, all of high frequency is filtered
Signal, obtains standardized digital signal and measured number signal.
9. the on-the-spot test method of current conversion station electronic mutual inductor according to claim 5, it is characterised in that described adopt
The tested analogue signal of the standard analog signal and tested transformer of collection standard mutual inductor, including：
The tested analogue signal of the standard analog signal and tested transformer of collection standard mutual inductor；
The acquisition time of the standard analog signal and tested analogue signal is marked.
10. the on-the-spot test method of current conversion station electronic mutual inductor according to claim 5, it is characterised in that described
The standard small voltage analogue signal and tested small voltage analogue signal are changed into standard digital letter by A/D converter respectively
Number and measured number signal, including：
The standard small voltage analogue signal and tested small voltage analogue signal are changed into criterion numeral by A/D converter respectively
Word signal and measured number signal；
The transformation time of the standardized digital signal and measured number signal is marked.
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