CN208283540U - A kind of electric energy meter direct current and even-order harmonic pilot system - Google Patents
A kind of electric energy meter direct current and even-order harmonic pilot system Download PDFInfo
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- CN208283540U CN208283540U CN201721201849.0U CN201721201849U CN208283540U CN 208283540 U CN208283540 U CN 208283540U CN 201721201849 U CN201721201849 U CN 201721201849U CN 208283540 U CN208283540 U CN 208283540U
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- voltage
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Abstract
The utility model discloses a kind of electric energy meter direct current and even-order harmonic pilot systems, comprising: voltage waveform generator, current waveform generator, voltage transformer VT2And standard calibration device, voltage waveform needed for voltage waveform generator output is tested, by voltage transformer VT2It is connect respectively with the voltage port of standard calibration device and checklist, the voltage port of standard calibration device and the voltage port of checklist are in parallel；Current waveform needed for current waveform generator output test, connect with the electric current port of standard calibration device and checklist, the electric current port of standard calibration device is connected with the electric current port of checklist respectively；Test signal passes through checklist and standard scale simultaneously, and standard calibration device carries out current sample using accurate sampling resistor, guarantees its metering accuracy under the influence of direct current and even-order harmonic, without carrying out load matched.
Description
Technical field
The utility model category Electric Energy Metering Technology field is tried in particular to a kind of electric energy meter direct current and even-order harmonic
Check system.
Background technique
With the increase of power consumer side nonlinear load, it is likely to occur in load-side current waveform more serious abnormal
Become, contains a large amount of harmonic wave even DC component.R46 international recommendation, European standard EN 50470 and standard GB/T/T
17215 all define electric energy meter direct current and even-order harmonic test method and requirement.
When test, sinusoidal current tests the current circuit that signal passes through standard electric energy meter；Power electronic devices is controlled to produce
The current signal of raw positive half cycle conducting and negative half period cut-off, the signal is by tested electric energy meter；Negative half period conducting at this time and just half
The current signal of week cut-off passes through matching impedance approximately equal with checklist resistance value.The constant of tested electric energy meter should be multiplied by 1/2
Coefficient to calculate relative error, be sinusoidal signal due to flowing through standard scale current circuit, can be according to conventional side
Method is traced to the source.Above-mentioned test method requires the resistance value of matching impedance should be approximately equal with the resistance value of tested electric energy meter, frequently with
Three kinds of methods below, it may be assumed that replace the matching impedance, control relay closure or shutdown of different resistance values by hand to adjust matching impedance
Matching is realized with the resistance value for adjusting electronic load with by feedback.First method is tested all to need to readjust to match every time and be born
It carries.This method has the shortcomings that inconvenient, time-consuming and test result is not accurate enough；Second method relay need to not stop
Make until the resistance of matched load and checklist is equal, relay frequent movement is also easy to produce electric arc and Auto-matching takes a long time；
Although the third method is able to achieve quick, load matched accurately and securely, but will increase production cost.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of electric energy meter direct current is provided and even is humorous
Wave pilot system, test signal pass through checklist and standard calibration device simultaneously, and standard calibration device is carried out using accurate sampling resistor
Current sample guarantees its metering accuracy under the influence of direct current and even-order harmonic, without carrying out load matched.
In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions:
A kind of electric energy meter direct current and even-order harmonic pilot system, comprising: voltage waveform generator, current waveform generator,
Voltage transformer VT2And standard calibration device.Voltage waveform needed for voltage waveform generator output is tested, by voltage transformer VT2
It is connect respectively with the voltage port of standard calibration device and checklist, the voltage port of standard calibration device and the voltage port of checklist
It is in parallel；Current waveform generator output test needed for current waveform, respectively with the electric current port of standard calibration device and checklist
Connection, the electric current port of standard calibration device is connected with the electric current port of checklist.
The standard calibration device, comprising: resistance R, voltage transformer VT1, AD conversion unit, DSP and display.Current wave
Shape generator output end mouth is connect by resistance R with checklist corresponding current port, the voltage analog signal input at the both ends resistance R
To AD conversion unit；Voltage transformer VT1Primary side and voltage transformer VT2Secondary side connection；Voltage transformer VT1's
One end of secondary side is grounded, and the other end is connect with the input terminal of AD conversion unit；AD conversion unit is by the voltage-mode on resistance R
Quasi- signal and voltage transformer VT1The voltage analog signal of secondary side be converted into digital signal；The output of AD conversion unit with
DSP connection, DSP carries out analytical calculation according to obtained digital signal, and calculated result is shown by display；Standard
Calibrator carries out current sample using resistance R, ensure that its accurate measurement under the influence of direct current and even-order harmonic.
A kind of electric energy meter direct current and even-order harmonic test method, the specific steps are as follows:
Step 1: the voltage port of standard calibration device and the voltage port of checklist are in parallel；The electric current port of standard calibration device
It connects with the electric current port of checklist；
Step 2: according to the specification and model of checklist, voltage waveform generator passes through voltage transformer VT2Output is sinusoidal
Voltage test signal, current waveform generator export sinusoidal current and test signal；
Step 3:AD converting unit is respectively by the voltage value and voltage transformer VT at bis- end resistance R1The voltage-mode of secondary side
Quasi- signal is converted into digital signal and exports to DSP；
Step 4:DSP analytical calculation obtains the energy value E in setting time Δ t1:
The pulse that step 5:DSP is exported according to checklist obtains the energy value E that checklist calculates in setting time Δ t2；
The relative error of checklist in setting time Δ t is calculated in step 6:DSP
Step 7: current feedback circuit stops output sinusoidal current and tests signal；
Step 8: current waveform generator exports the direct current of positive half cycle conducting and negative half period cut-off and even-order harmonic electric current is surveyed
Trial signal；
Step: 9: likewise, respectively obtaining the energy value E that setting time Δ t internal standard calibrator and checklist calculate3With
E4；
The relative error of checklist in setting time Δ t is calculated in step 10:DSP
Step 11: obtaining error change value γ=γ under the influence of direct current and even-order harmonic2-γ1；
Step 12: setting error change is limited to γ0If γ≤γ0, then checklist is met the requirements；Such as γ > γ0, then it is detected
Table is unsatisfactory for requiring.
It should be noted that DSP can also be by formula in step 10Setting time Δ is calculated
The relative error of checklist in t.
The beneficial effects of the utility model are: test signal passes through checklist and standard calibration device, standard calibration device simultaneously
Current sample is carried out using accurate sampling resistor, guarantees its metering accuracy under the influence of direct current and even-order harmonic, is not necessarily to
Carry out load matched.
Detailed description of the invention
Fig. 1 is the pilot system schematic illustration of the utility model；
Fig. 2 is to carry out electric energy meter direct current and even-order harmonic test method flow chart using the utility model.
Specific embodiment
The utility model is described in further detail with specific embodiment with reference to the accompanying drawing:
It is the pilot system schematic illustration of the utility model shown in Fig. 1, a kind of electric energy meter direct current and even-order harmonic test
System, comprising: voltage waveform generator, current waveform generator, voltage transformer VT2And standard calibration device.
Voltage waveform needed for voltage waveform generator output is tested, by voltage transformer VT2Respectively with standard calibration device
And the voltage port connection of checklist, the voltage port of standard calibration device and the voltage port of checklist are in parallel；Current waveform hair
Current waveform needed for raw device output test, connect with the electric current port of standard calibration device and checklist, standard calibration device respectively
Electric current port connect with the electric current port of checklist.
The standard calibration device, comprising: resistance R, voltage transformer VT1, AD conversion unit, DSP and display.
Current waveform generator output port is connect by resistance R with checklist corresponding current port, the electricity at the both ends resistance R
Pressure analog signal is input to AD conversion unit；Voltage transformer VT1Primary side and voltage transformer VT2Secondary side connection；Electricity
Press mutual inductor VT1Secondary side one end ground connection, the other end connect with the input terminal of AD conversion unit；AD conversion unit is by resistance
Voltage analog signal and voltage transformer VT on R1The voltage analog signal of secondary side be converted into digital signal；AD conversion
The output of unit is connect with DSP, and DSP carries out analytical calculation according to obtained digital signal, and calculated result is passed through display
It is shown；Standard calibration device carries out current sample using resistance R, ensure that its metering under the influence of direct current and even-order harmonic
Accurately.
Fig. 2 is to carry out electric energy meter direct current and even-order harmonic test method flow chart using the utility model.
Step 1: the voltage port of standard calibration device and the voltage port of checklist are in parallel；The electric current port of standard calibration device
It connects with the electric current port of checklist；
Step 2: according to the specification and model of checklist, voltage waveform generator passes through voltage transformer VT2Output is sinusoidal
Voltage test signal, current waveform generator export sinusoidal current and test signal；
Step 3:AD converting unit is respectively by the voltage value and voltage transformer VT at bis- end resistance R1The voltage-mode of secondary side
Quasi- signal is converted into digital signal and exports to DSP；
Step 4:DSP analytical calculation obtains the energy value E in setting time Δ t1:
The pulse that step 5:DSP is exported according to checklist obtains the energy value E that checklist calculates in setting time Δ t2；
The relative error of checklist in setting time Δ t is calculated in step 6:DSP
Step 7: current feedback circuit stops output sinusoidal current and tests signal；
Step 8: current waveform generator exports the direct current of positive half cycle conducting and negative half period cut-off and even-order harmonic electric current is surveyed
Trial signal；
Step: 9: likewise, respectively obtaining the energy value E that setting time Δ t internal standard calibrator and checklist calculate3With
E4；
The relative error of checklist in setting time Δ t is calculated in step 10:DSP
Step 11: obtaining error change value γ=γ under the influence of direct current and even-order harmonic2-γ1；
Step 12: setting error change is limited to γ0If γ≤γ0, then checklist is met the requirements；Such as γ > γ0, then it is detected
Table is unsatisfactory for requiring.
It should be noted that DSP can also be by formula in step 10Setting time Δ t is calculated
The relative error of interior checklist；Setting time Δ t answers long enough, random when carrying out using active constant calculating electric energy to reduce
Error.
Compared with prior art, the utility model has the beneficial effects that the utility model provide a kind of electric energy meter direct current and
Even-order harmonic pilot system and method, test signal pass through checklist and standard calibration device simultaneously, and standard calibration device is using accurate
Sampling resistor carries out current sample, guarantees its metering accuracy under the influence of direct current and even-order harmonic, without being loaded
Matching.
Undeclared part involved in the utility model is same as the prior art or is realized using the prior art.
Claims (2)
1. a kind of electric energy meter direct current and even-order harmonic pilot system, comprising: voltage waveform generator, current waveform generator, electricity
Press mutual inductor VT2And standard calibration device；It is characterized in that: required voltage waveform is tested in voltage waveform generator output, through overvoltage
Mutual inductor VT2It is connect respectively with the voltage port of standard calibration device and checklist, the voltage port and checklist of standard calibration device
Voltage port it is in parallel；Current waveform generator output test needed for current waveform, respectively with standard calibration device and checklist
Electric current port connection, the electric current port of standard calibration device is connected with the electric current port of checklist.
2. electric energy meter direct current as described in claim 1 and even-order harmonic pilot system, it is characterized in that: the standard calibration device packet
It includes: resistance R, voltage transformer VT1, AD conversion unit, DSP and display；Current waveform generator output port passes through resistance R
It is connect with checklist corresponding current port, the voltage analog signal at the both ends resistance R is input to AD conversion unit；Voltage transformer
VT1Primary side and voltage transformer VT2Secondary side connection；Voltage transformer VT1Secondary side one end ground connection, the other end
It is connect with the input terminal of AD conversion unit；The output of AD conversion unit is connect with DSP, DSP connection display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721201849.0U CN208283540U (en) | 2017-09-19 | 2017-09-19 | A kind of electric energy meter direct current and even-order harmonic pilot system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721201849.0U CN208283540U (en) | 2017-09-19 | 2017-09-19 | A kind of electric energy meter direct current and even-order harmonic pilot system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208283540U true CN208283540U (en) | 2018-12-25 |
Family
ID=64747259
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721201849.0U Withdrawn - After Issue CN208283540U (en) | 2017-09-19 | 2017-09-19 | A kind of electric energy meter direct current and even-order harmonic pilot system |
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| CN (1) | CN208283540U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589394A (en) * | 2017-09-19 | 2018-01-16 | 国网江西省电力公司电力科学研究院 | A kind of electric energy meter direct current and even-order harmonic pilot system and method |
| CN110174574A (en) * | 2019-06-20 | 2019-08-27 | 江苏方天电力技术有限公司 | Integrated protection and monitoring device electrical measurement calibrating installation and electric flux calibration method |
-
2017
- 2017-09-19 CN CN201721201849.0U patent/CN208283540U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589394A (en) * | 2017-09-19 | 2018-01-16 | 国网江西省电力公司电力科学研究院 | A kind of electric energy meter direct current and even-order harmonic pilot system and method |
| CN107589394B (en) * | 2017-09-19 | 2020-06-23 | 国网江西省电力公司电力科学研究院 | Direct current and even harmonic test system and method for electric energy meter |
| CN110174574A (en) * | 2019-06-20 | 2019-08-27 | 江苏方天电力技术有限公司 | Integrated protection and monitoring device electrical measurement calibrating installation and electric flux calibration method |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181225 Effective date of abandoning: 20200623 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20181225 Effective date of abandoning: 20200623 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |