CN107861089A - A kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions - Google Patents
A kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions Download PDFInfo
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- CN107861089A CN107861089A CN201710877748.3A CN201710877748A CN107861089A CN 107861089 A CN107861089 A CN 107861089A CN 201710877748 A CN201710877748 A CN 201710877748A CN 107861089 A CN107861089 A CN 107861089A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions, the test signal waveform of structure reflection electric energy meter exceptional operating conditions, obtain the test signal of frequency fluctuation and amplitude fluctuations, accurate measurement of the standard calibration device in this test signal is realized, meter characteristic of the electric energy meter under exceptional operating conditions can be detected.
Description
Technical field
The invention belongs to Electric Energy Metering Technology field, in particular to a kind of intelligence electricity for being adapted to exceptional operating conditions
Can table method of testing.
Background technology
As the important component of intelligent grid, the metering accuracy of intelligent electric energy meter directly affects the clearing of the electricity charge.
Current national verification code JJG596, standard GB/T/T 17215.321, European standard EN50470, international recommendation R46 etc.
Requirement is proposed to the performance of electric energy meter.
Traditional detection method is frequently with virtual load method and method of standard table：During detection, calibration power source output voltage and electricity
Flow signal；The voltage end of standard scale and tested table is in parallel, current terminal series connection；By control voltage and the amplitude of electric current, phase and
Frequency analog is tested the different live operating condition of table.Frequency shift is tested as defined in standard, and the frequency of test signal exists
0.98fnom~1.02fnom(fnomFor reference frequency) in the range of change.During experiment, the frequency for first making test signal is fnom, obtain
The relative error magnitudes of tested table；Change the frequency of test signal again, now frequency is 0.98fnom~1.02fnomIn the range of certain
One fixed value, obtain the relative error magnitudes of tested table；By allowable error as defined in the relative error change value of tested table and standard
Limit is compared, to judge whether tested table meets to require.However, the frequency of electric energy meter field line signal is often in certain model
Enclose interior round fluctuation and with periodically, test signal when frequency shift is tested obviously can not reflect such a operating condition.This
Outside, the current signal of impact load circuit, its amplitude only change sinusoidal current often with there is the characteristics of rapid fluctuations in a wide range
The virtual value of test signal obviously can not reflect this operating condition.Even, access what the signal of electric energy meter fluctuated in frequency
Meanwhile its current amplitude is also in rapid fluctuations.At present, a kind of intelligent electric energy meter method of testing is lacked, for examining electric energy meter to exist
Metering accuracy under above-mentioned various exceptional operating conditions.
The content of the invention
The invention aims to overcome the deficiencies in the prior art, there is provided a kind of intelligence for being adapted to exceptional operating conditions
Energy electric energy meter method of testing, for examining metering accuracy of the intelligent electric energy meter in frequency fluctuation and amplitude fluctuations.
In order to solve the above-mentioned technical problem, the present invention is realized using following technical scheme：
A kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions, is comprised the following steps that：
Step 1：Tested table is in parallel with the voltage circuit of standard calibration device, current circuit series connection；
Step 2：The voltage output port of signal generator is connected with tested table corresponding voltage port, current output terminal mouth with
Tested table corresponding current port connection；
Step 3：Structure can reflect the test signal waveform of electric energy meter exceptional operating conditions；
Step 4：Signal generator can be reflected according to the specification and model arrange parameter of tested table by signal generator output
Frequency fluctuation and the test signal of amplitude fluctuations；Generator output voltage test signal, according to the load characteristic of simulation, if
Put power factor θ, output current test signal；
Step 5：In sufficiently long time interval Δ t, electric energy E is counted according to standard calibration device1Electricity is counted with tested table
Can E2, obtain relative error
Step 6：If the frequency fluctuation limits of error are vbase, the worst error allowed under the influence of frequency fluctuation changes into
vf, the worst error allowed under the influence of amplitude fluctuations changes into vI, obtain under special operation condition, be tested Watch Error limit
Step 7：Judge whether γ is not more than v；Meet to require if so, being then tested table；It is unsatisfactory for wanting if it is not, being then tested table
Ask.
The method that above-mentioned steps 3 build the test signal waveform that can reflect electric energy meter exceptional operating conditions is as follows：
Step 1：Test signal reflects the round fluctuation of frequency and with periodicity, if its function expression is f (t), week
Phase is T；Waveform in a cycle is made up of n cycle, and wherein n is the positive integer not less than 2；I-th (1≤i≤n) individual week
The function expression of ripple is fi(t), its frequency is fi, cycle Ti=1/fi；Meet formula (1):
0.98fnom≤fi≤1.02fnom (1)
In formula (1), fnomFor reference frequency；
In 0≤t≤Tn, i.e., in a cycle shown in f (t) expression formula such as formula (2)：
For the test waveform of structure in a cycle, frequency will be followed successively by f1, f2..., fn-1, fn, constitute frequency fluctuation
Test signal.
Step 2：To form frequency fluctuation test signal, i-th of cycle f of each phase voltage test signali(t) function table
It is respectively up to formula：
Wherein, uai(t)、ubi(t)、uci(t) it is respectively a phases, b phases and c phase voltage test signals；M believes for each voltage tester
The virtual value of number each all wave amplitudes；
Step 3：If power factor is θ, then i-th of cycle f of each phase current test signali(t) function expression point
It is not：
Wherein, iai(t)、ibi(t)、ici(t) it is respectively a phases, b phases and c phase current test signals；NiBelieve for testing current
The virtual value of number i-th week wave amplitude；
Have for signal frequency fluctuation in reflection circuit and the simultaneous situation of amplitude fluctuations, each phase current test signal
Shown in valid value N expression formula such as formula (9)：
Ni=qiN (9)
Wherein, qiFor amplitude variation coefficient, N is amplitude reference value；
Step 4：In fi(t) a cycle TiOn with constant duration Ti/ m takes m point successively, and j-th point of value is fi
(jTi/m)；Value is carried out successively to n cycle for forming each voltage and current test signal, each voltage and current is tested
For signal, there is n × m value altogether；
Step 5：According to time interval TiN × m described in extraction step 4 is worth/m successively, forms data signal；
Step 6：Data signal progress DA is converted to analog signal；
Step 7：Obtained analog signal is filtered；
Step 8：Amplify filtered signal, obtain testing required each phase voltage and each phase current signal.
This method is realized based on a kind of intelligent electric energy meter detection means, including：Signal generator, DSP, counting are compared
Device, frequency dividing setting unit, isolated location, three-phase standard voltage source, three-phase normalized current source and standard calibration device.
Signal generator is connected by communication interface A with DSP output ends；DSP output end and the input of count comparator
End connection, DSP output end are connected with the input of three-phase standard voltage source and the input in three-phase normalized current source simultaneously；Meter
Number comparators output end be connected with isolated location, isolated location export while and standard calibration device in the first AD conversion list
Member and the connection of the second AD conversion unit；Frequency dividing setting unit output is connected with count comparator control terminal；Signal generator it is defeated
Go out and be connected through communication interface B with three-phase standard voltage source and three-phase normalized current source；The voltage port of standard calibration device is with being tested
The corresponding voltage port of table is in parallel；Connected with the corresponding current port of tested table the electric current port of standard calibration device；Three-phase standard
Voltage source output voltage test signal, output port are connected with standard calibration device corresponding voltage port；Three-phase normalized current source is defeated
Go out current test signal, output port is connected with standard calibration device corresponding current port.
Standard calibration device, including：Voltage sampling unit, current sampling unit, the first modulate circuit, the second modulate circuit,
First AD conversion unit, the second AD conversion unit and MCU；The output of three-phase standard voltage source and the input of voltage sampling unit connect
Connect, the output of voltage sampling unit connects with the input of the first modulate circuit, the output of the first modulate circuit and the first AD conversion unit
Input connection；The output of first AD conversion unit is connected with MCU；The output in three-phase normalized current source and current sampling unit
Input connection, the output of current sampling unit connect with the input of the second modulate circuit, and the output of the second modulate circuit turns with the 2nd AD
Change the input connection of unit；The output of second AD conversion unit is connected with MCU.
Signal generator by from n × m data of waveform extracting by PORT COM B be transferred to three-phase standard voltage source and
Three-phase normalized current source simultaneously stores；Signal generator is by each phase voltage and the time interval of each phase current test signal waveform extracting
Ti/ m values are transferred to DSP, and DSP is according to time interval Ti/ m output control pulses, control three-phase standard voltage source and three-phase standard electric
Stream source carries out DA conversions to the data of storage, is amplified by filtering process and signal, exports required each phase voltage and each mutually electricity
Current test signal.
Frequency dividing setting unit sets divider ratio n according to the actual requirements, and count comparator is constantly to the pulse signal of DSP outputs
Counted, and compared with divider ratio n is set；When count value is n, count value is reset and exports an arteries and veins by count comparator
Signal is rushed, so circulation realizes that the n of the pulse signal to DSP outputs is divided；Count comparator passes through isolated location output frequency division
Pulse signal afterwards, the first AD conversion unit in standard calibration device and the second AD conversion unit is controlled to be AD converted so that
Standard calibration device can be realized to be sampled to the Complete Synchronization of each phase voltage and each phase current test signal, ensure that standard calibration device exists
Metering accuracy when frequency test signal fluctuates.
Per mutually there is 4 conditioning branch roads, conditioning branch road includes second modulate circuit：Buffer, amplifier, filter circuit and drive
Dynamic circuit is formed；The output of current sampling unit connects with the input of buffer, and buffer is used to reduce input impedance to electric current
The influence of sampling unit output；The output of buffer is amplified through amplifier to be connected with the input of filter circuit, the output of wave filter
Input and connect with drive circuit, drive circuit output signal driving AD conversion unit.
To a certain phase current test signal, the multiplication factor of amplifier is different in 4 conditioning branch roads；Current test signal
4 conditioning branch road conditionings are passed sequentially through, are AD converted by the second AD conversion unit, MCU stores the data signal after conversion
And handle, 4 groups of data are obtained within a sampling period；By 4 groups of data of current a cycle, MCU calculates 4 electric currents
Average value I1、I2、I3And I4；Standard calibration device sets 4 current ranges, is respectively (I1min~I1max)、(I2min~I2max)、
(I13min~I3max) and (I4min~I4max)；By judging I1、I2、I3And I4Whether in the range selected by the previous sampling period
In the range of, MCU selected in 4 groups of data corresponding to one group of data calculate electric energy；Three-phase current test signal does same place
Reason, ensure that accurate measurement of the standard calibration device in test signal amplitude fluctuations.
The beneficial effects of the invention are as follows：The present invention provides a kind of intelligent electric energy meter test side for being adapted to exceptional operating conditions
Method, the test signal waveform of structure reflection electric energy meter exceptional operating conditions, obtains the test signal of frequency fluctuation and amplitude fluctuations,
Accurate measurement of the standard calibration device in this test signal is realized, it is special that metering of the electric energy meter under exceptional operating conditions can be detected
Property.
Brief description of the drawings
Fig. 1 is the principle of device schematic diagram of the present invention；
Fig. 2 is the structure chart of modulate circuit；
Fig. 3 is the method for testing flow chart of the present invention；
Fig. 4 is the flow chart of the test signal waveform of present invention structure reflection electric energy meter exceptional operating conditions.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Be shown in Fig. 1 the present invention principle of device schematic diagram, a kind of intelligent electric energy meter detection means, including：Signal occurs
Device, DSP, count comparator, frequency dividing setting unit, isolated location, three-phase standard voltage source, three-phase normalized current source and standard school
Quasi- device.Signal generator is connected by communication interface A with DSP output ends；DSP output end and the input of count comparator connect
Connect, DSP output end is connected with the input of three-phase standard voltage source and the input in three-phase normalized current source simultaneously；Count ratio
Output end compared with device is connected with isolated location, isolated location output simultaneously and the first AD conversion unit in standard calibration device and
Second AD conversion unit connects；Frequency dividing setting unit output is connected with count comparator control terminal；The output warp of signal generator
Communication interface B is connected with three-phase standard voltage source and three-phase normalized current source；The voltage port of standard calibration device and tested table
Corresponding voltage port is in parallel；Connected with the corresponding current port of tested table the electric current port of standard calibration device；Three-phase normal voltage
Source output voltage test signal, output port are connected with standard calibration device corresponding voltage port；Three-phase normalized current source output electricity
Current test signal, output port are connected with standard calibration device corresponding current port.
Standard calibration device, including：Voltage sampling unit, current sampling unit, the first modulate circuit, the second modulate circuit,
First AD conversion unit, the second AD conversion unit and MCU；The output of three-phase standard voltage source and the input of voltage sampling unit connect
Connect, the output of voltage sampling unit connects with the input of the first modulate circuit, the output of the first modulate circuit and the first AD conversion unit
Input connection；The output of first AD conversion unit is connected with MCU；The output in three-phase normalized current source and current sampling unit
Input connection, the output of current sampling unit connect with the input of the second modulate circuit, and the output of the second modulate circuit turns with the 2nd AD
Change the input connection of unit；The output of second AD conversion unit is connected with MCU.
Signal generator by from n × m data of waveform extracting by PORT COM B be transferred to three-phase standard voltage source and
Three-phase normalized current source simultaneously stores；Signal generator is by each phase voltage and the time interval of each phase current test signal waveform extracting
Ti/ m values are transferred to DSP, and DSP is according to time interval Ti/ m output control pulses, control three-phase standard voltage source and three-phase standard electric
Stream source carries out DA conversions to the data of storage, is amplified by filtering process and signal, exports required each phase voltage and each mutually electricity
Current test signal.
The pulse signal that frequency dividing setting unit control count comparator exports DSP is according to n:1 ratio is divided, and is passed through
Isolated location output pulse signal, the first AD conversion unit in standard calibration device and the second AD conversion unit is controlled to carry out AD and turn
Change so that standard calibration device can be realized to be sampled to the Complete Synchronization of each phase voltage and each phase current test signal, ensure that standard
Metering accuracy of the calibrator when frequency test signal fluctuates.
Fig. 2 is the structure chart of modulate circuit, for A phase current test signals；The times magnification of amplifier in 4 conditioning branch roads
Number is different, respectively A1、A2、A3And A4；4 conditioning branch road conditionings are passed sequentially through, carrying out AD by the second AD conversion unit turns
Change, the data signal after conversion is stored and handled by MCU, and 4 groups of corresponding datas are obtained within a sampling period；By current
4 groups of data Q of a cycle1、Q2、Q3And Q4, 4 current average I of MCU calculating1、I2、I3And I4；Standard calibration device sets 4
Current range, it is respectively (I1min~I1max)、(I2min~I2max)、(I13min~I3max) and (I4min~I4max)；Adopted Ru previous
Range ability selected by the sample cycle is (I1min~I1max), judge I2In (I1min~I1max) scope, MCU selection corresponding to one
Group data Q2Calculate electric energy；B phases and C phase currents test signal do same processing, ensure that standard calibration device is believed in test
Accurate measurement during number amplitude fluctuations.
Fig. 3 be the present invention method of testing flow chart, a kind of intelligent electric energy meter test side for being adapted to exceptional operating conditions
Method, comprise the following steps that：
Step 1：Tested table is in parallel with the voltage circuit of standard calibration device, current circuit series connection；
Step 2：The voltage output port of signal generator is connected with tested table corresponding voltage port, current output terminal mouth with
Tested table corresponding current port connection；
Step 3：Structure can reflect the test signal waveform of electric energy meter exceptional operating conditions；
Step 4：Signal generator can be reflected according to the specification and model arrange parameter of tested table by signal generator output
Frequency fluctuation and the test signal of amplitude fluctuations；Generator output voltage test signal, according to the load characteristic of simulation, if
Put power factor θ, output current test signal；
Step 5：In sufficiently long time interval Δ t, electric energy E is counted according to standard calibration device1Electricity is counted with tested table
Can E2, obtain relative error
Step 6：If the frequency fluctuation limits of error are vbase, the worst error allowed under the influence of frequency fluctuation changes into
vf, the worst error allowed under the influence of amplitude fluctuations changes into vI, obtain under special operation condition, be tested Watch Error limit
Step 7：Judge whether γ is not more than v；Meet to require if so, being then tested table；It is unsatisfactory for wanting if it is not, being then tested table
Ask.
Fig. 4 is the flow chart of the test signal waveform of present invention structure reflection electric energy meter exceptional operating conditions, and structure can be anti-
The method for reflecting the test signal waveform of electric energy meter exceptional operating conditions is as follows：
Step 1：Test signal reflects the round fluctuation of frequency and with periodicity, if its function expression is f (t), week
Phase is T；Waveform in a cycle is made up of n cycle, and wherein n is the positive integer not less than 2；I-th (1≤i≤n) individual week
The function expression of ripple is fi(t), its frequency is fi, cycle Ti=1/fi；Meet formula (1):
0.98fnom≤fi≤1.02fnom (1)
In formula (1), fnomFor reference frequency；
In 0≤t≤Tn, i.e., in a cycle shown in f (t) expression formula such as formula (2)：
For the test waveform of structure in a cycle, frequency will be followed successively by f1, f2..., fn-1, fn, constitute the ripple of frequency
It is dynamic.
Step 2：To form frequency fluctuation test signal, i-th of cycle f of each phase voltage test signali(t) function table
It is respectively up to formula：
Wherein, uai(t)、ubi(t)、uci(t) it is respectively a phases, b phases and c phase voltage test signals；M believes for each voltage tester
The virtual value of number each all wave amplitudes；
Step 3：If power factor is θ, then i-th of cycle f of each phase current test signali(t) function expression point
It is not：
Wherein, iai(t)、ibi(t)、ici(t) it is respectively a phases, b phases and c phase current test signals；NiBelieve for testing current
The virtual value of number i-th week wave amplitude；
Have for signal frequency fluctuation in reflection circuit and the simultaneous situation of amplitude fluctuations, each phase current test signal
Shown in valid value N expression formula such as formula (9)：
Ni=qiN (9)
Wherein, qiFor amplitude variation coefficient, N is amplitude reference value；
Step 4：In fi(t) a cycle TiOn with constant duration Ti/ m takes m point successively, and j-th point of value is fi
(jTi/m)；Value is carried out successively to n cycle for forming each voltage and current test signal, each voltage and current is tested
For signal, there is n × m value altogether；
Step 5：According to time interval TiN × m described in extraction step 4 is worth/m successively, forms data signal；
Step 6：Data signal progress DA is converted to analog signal；
Step 7：Obtained analog signal is filtered；
Step 8：Amplify filtered signal, obtain testing required each phase voltage and each phase current signal.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention provides a kind of exceptional operating conditions of being adapted to
Intelligent electric energy meter method of testing, the test signal waveform of structure reflection electric energy meter exceptional operating conditions, obtains frequency fluctuation and width
It is worth the test signal of fluctuation, is acted on by any frequency divider frequency dividing and a plurality of conditioning branch road is set, realize standard calibration device herein
The metering accuracy of test signal, meter characteristic of the electric energy meter under exceptional operating conditions can be detected.
The undeclared part being related in the present invention is same as the prior art or is realized using prior art.
Claims (8)
1. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions, it is characterised in that comprise the following steps that：
Step 1：Tested table is in parallel with the voltage circuit of standard calibration device, current circuit series connection；
Step 2：The voltage output port of signal generator is connected with tested table corresponding voltage port, and current output terminal mouth is with being tested
Table corresponding current port connects；
Step 3：Structure can reflect the test signal waveform of electric energy meter exceptional operating conditions；
Step 4：Signal generator can reflect frequency according to the specification and model arrange parameter of tested table by signal generator output
Fluctuation and the test signal of amplitude fluctuations；Generator output voltage test signal, according to the load characteristic of simulation, work(is set
Rate factor θ, output current test signal；
Step 5：In sufficiently long time interval Δ t, electric energy E is counted according to standard calibration device1Electric energy E is counted with tested table2,
Obtain relative error
Step 6：If the frequency fluctuation limits of error are vbase, the worst error allowed under the influence of frequency fluctuation changes into vf, width
The worst error allowed under value influence of fluctuations changes into vI, obtain under special operation condition, be tested Watch Error limit
Step 7：Judge whether γ is not more than v；Meet to require if so, being then tested table；It is unsatisfactory for requiring if it is not, being then tested table.
2. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 1, its feature exist
In structure can reflect that the method for the test signal waveform of electric energy meter exceptional operating conditions is as follows：
Step 1：Test signal reflects the round fluctuation of frequency and had periodically that, if its function expression is f (t), the cycle is
T；Waveform in a cycle is made up of n cycle, and wherein n is the positive integer not less than 2；I-th (1≤i≤n) individual cycle
Function expression is fi(t), its frequency is fi, cycle Ti=1/fi；Meet formula (1):
0.98fnom≤fi≤1.02fnom (1)
In formula (1), fnomFor reference frequency；
In 0≤t≤Tn, i.e., in a cycle shown in f (t) expression formula such as formula (2)：
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Trial signal；
Step 2：To form frequency fluctuation test signal, i-th of cycle f of each phase voltage test signali(t) function expression
Respectively：
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<mn>2</mn>
<mi>&pi;</mi>
<mi>t</mi>
<mo>/</mo>
<msub>
<mi>T</mi>
<mi>i</mi>
</msub>
<mo>+</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mo>/</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, uai(t)、ubi(t)、uci(t) it is respectively a phases, b phases and c phase voltage test signals；M is that each voltage test signal is each
The virtual value of all wave amplitudes；
Step 3：If power factor is θ, then i-th of cycle f of each phase current test signali(t) function expression is respectively：
<mrow>
<msub>
<mi>i</mi>
<mrow>
<mi>a</mi>
<mi>i</mi>
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<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<msub>
<mi>N</mi>
<mi>i</mi>
</msub>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mi>&pi;</mi>
<mi>t</mi>
<mo>/</mo>
<msub>
<mi>T</mi>
<mi>i</mi>
</msub>
<mo>+</mo>
<mi>&theta;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>i</mi>
<mrow>
<mi>b</mi>
<mi>i</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<msub>
<mi>N</mi>
<mi>i</mi>
</msub>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
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<mn>2</mn>
<mi>&pi;</mi>
<mi>t</mi>
<mo>/</mo>
<msub>
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<mo>-</mo>
<mn>2</mn>
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<mn>3</mn>
<mo>+</mo>
<mi>&theta;</mi>
<mo>)</mo>
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<mn>7</mn>
<mo>)</mo>
</mrow>
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<mi>i</mi>
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<mi>c</mi>
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<msqrt>
<mn>2</mn>
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<mo>)</mo>
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<mn>8</mn>
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</mrow>
Wherein, iai(t)、ibi(t)、ici(t) it is respectively a phases, b phases and c phase current test signals；NiFor current test signal i-th
The virtual value of individual all wave amplitudes；
For signal frequency fluctuation and the simultaneous situation of amplitude fluctuations in reflection circuit, the virtual value of each phase current test signal
Shown in N expression formula such as formula (9)：
Ni=qiN (9)
Wherein, qiFor amplitude variation coefficient, N is amplitude reference value；
Step 4：In fi(t) a cycle TiOn with constant duration Ti/ m takes m point successively, and j-th point of value is fi(jTi/
m)；Value is carried out successively to n cycle for forming each voltage and current test signal, to each voltage and current test signal
Speech, there is n × m value altogether；
Step 5：According to time interval TiN × m described in extraction step 4 is worth/m successively, forms data signal；
Step 6：Data signal progress DA is converted to analog signal；
Step 7：Obtained analog signal is filtered；
Step 8：Amplify filtered signal, obtain testing required each phase voltage and each phase current signal.
3. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 1, its feature exist
In, realized by intelligent electric energy meter detection means, the intelligent electric energy meter detection means include signal generator, DSP, counting
Comparator, frequency dividing setting unit, isolated location, three-phase standard voltage source, three-phase normalized current source and standard calibration device；Signal is sent out
Raw device is connected by communication interface A with DSP output ends；DSP output end connects with the input of count comparator, and DSP's is defeated
Go out end to be connected with the input of three-phase standard voltage source and the input in three-phase normalized current source simultaneously；The output of count comparator
End is connected with isolated location, the output of isolated location while and the first AD conversion unit and the second AD conversion in standard calibration device
Unit connects；Frequency dividing setting unit output is connected with count comparator control terminal；The output of signal generator through communication interface B with
Three-phase standard voltage source and the connection of three-phase normalized current source；The voltage port of standard calibration device and the corresponding voltage port of tested table
It is in parallel；Connected with the corresponding current port of tested table the electric current port of standard calibration device；Three-phase standard voltage source output voltage is surveyed
Trial signal, output port are connected with standard calibration device corresponding voltage port；Three-phase normalized current source output current test signal, it is defeated
Exit port is connected with standard calibration device corresponding current port.
4. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 3, its feature exist
In standard calibration device includes：Voltage sampling unit, current sampling unit, the first modulate circuit, the second modulate circuit, the first AD
Converting unit, the second AD conversion unit and MCU；The output of three-phase standard voltage source and the input of voltage sampling unit connect, electricity
The output and the input of the first modulate circuit for pressing sampling unit connect, the output of the first modulate circuit and the input of the first AD conversion unit
Connection；The output of first AD conversion unit is connected with MCU；The output in three-phase normalized current source and the input of current sampling unit connect
Connect, the output of current sampling unit connects with the input of the second modulate circuit, the output of the second modulate circuit and the second AD conversion unit
Input connection；The output of second AD conversion unit is connected with MCU.
5. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 4, its feature exist
In per mutually there is 4 conditioning branch roads, conditioning branch road includes the second described modulate circuit：Buffer, amplifier, filter circuit and
Drive circuit is formed；The output of current sampling unit connects with the input of buffer, and buffer is used to reduce input impedance to electricity
Flow the influence of sampling unit output；The output of buffer is amplified through amplifier to be connected with the input of filter circuit, wave filter it is defeated
Go out to input with drive circuit and connect, drive circuit output signal driving AD conversion unit.
6. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 5, its feature exist
In to a certain phase current test signal, the multiplication factor of amplifier is different in 4 conditioning branch roads；Current test signal is successively
Nursed one's health, be AD converted by the second AD conversion unit, the data signal after conversion is stored and located by MCU by 4 conditioning branch roads
Reason, is obtained 4 groups of data within a sampling period；By 4 groups of data of current a cycle, MCU calculates 4 electric currents and is averaged
Value I1、I2、I3And I4；Standard calibration device sets 4 current ranges, is respectively (I1min~I1max)、(I2min~I2max)、(I13min
~I3max) and (I4min~I4max)；By judging I1、I2、I3And I4Whether in the range ability selected by the previous sampling period
It is interior, MCU selected in 4 groups of data corresponding to one group of data calculate electric energy；Three-phase current test signal does same processing.
7. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 4, its feature exist
In signal generator will be transferred to three-phase standard voltage source and three-phase from n × m data of waveform extracting by PORT COM B
Normalized current source simultaneously stores；Signal generator is by the time interval T of each phase voltage and each phase current test signal waveform extractingi/m
Value is transferred to DSP, and DSP is according to time interval Ti/ m output control pulses, control three-phase standard voltage source and three-phase normalized current
Source carries out DA conversions to the data of storage, is amplified by filtering process and signal, exports required each phase voltage and each phase current
Test signal.
8. a kind of intelligent electric energy meter method of testing for being adapted to exceptional operating conditions according to claim 4, its feature exist
In frequency dividing setting unit sets divider ratio n according to the actual requirements, and count comparator is constantly carried out to the pulse signal of DSP outputs
Count, and compared with divider ratio n is set；When count value is n, count value is reset and export a pulse by count comparator to be believed
Number, so circulation realizes that the n of the pulse signal to DSP outputs is divided；Count comparator is after isolated location output frequency division
Pulse signal, the first AD conversion unit in standard calibration device and the second AD conversion unit is controlled to be AD converted so that standard
Calibrator can be realized to be sampled to the Complete Synchronization of each phase voltage and each phase current test signal.
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| CN111766558A (en) * | 2020-08-20 | 2020-10-13 | 河南许继仪表有限公司 | Electric energy meter special power supply working condition simulation test system and test method |
| WO2021127361A1 (en) * | 2019-12-19 | 2021-06-24 | Landis+Gyr Technologies, Inc. | Gating energy consumption accumulation by detecting a fundamental component of a current |
| CN114008550A (en) * | 2019-05-10 | 2022-02-01 | 西屋电气有限责任公司 | Calibration system and method |
| CN118151087A (en) * | 2024-05-09 | 2024-06-07 | 江苏西欧电子有限公司 | Electric energy meter metering error analysis method and system based on electric power data acquisition |
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