CN104198977B - Accuracy detection method based on average power error for analog input combining unit - Google Patents
Accuracy detection method based on average power error for analog input combining unit Download PDFInfo
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- CN104198977B CN104198977B CN201410383466.4A CN201410383466A CN104198977B CN 104198977 B CN104198977 B CN 104198977B CN 201410383466 A CN201410383466 A CN 201410383466A CN 104198977 B CN104198977 B CN 104198977B
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- 238000001514 detection method Methods 0.000 title abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims description 41
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses an accuracy detection method based on an average power error for an analog input combining unit. The method is characterized in that the average power error is taken as the basis for judging the metering accuracy of the analog input combining unit, and an accuracy detection circuit of the analog input combining unit is constructed by a three-phase analog standard source with zero-crossing synchronous clock output, a three-phase standard electric energy meter and message analysis module equipment. During testing of the analog input combining unit, the three-phase analog standard source outputs three-phase symmetrical analog voltage and current signals, and the voltage and current power factors are adjustable; an output synchronous time tick clock is synchronous to a phase A voltage zero-crossing point, and the synchronization accuracy is 0.2us; the output voltage and current accuracies are 0.02 in grades; the format of an output synchronous time tick clock signal is consistent with the time tick clock format of he tested analog input combining unit, namely, both formats are IRIG_B code. Through adoption of the detection method, the average power error value of the analog input combining unit is directly provided through a detection result, and the metering performance of the analog input combining unit can be better embodied.
Description
Technical field
The present invention relates to a kind of simulation input combining unit method for detecting accuracy, belong to instrument verification and properties of product are surveyed
Examination field.
Background technology
Simulation input combining unit is a kind of new digital metering equipment, needs the metering performance of detection to include ratio
Difference, phase error, specified time delay etc., generally adopt digital detection method, due to not yet setting up digital traceability system at present,
The metering performance testing result causing simulation input combining unit is recruited query, have impact on simulation input combining unit in electric energy meter
Popularization and application in amount device.
Content of the invention
The technical problem to be solved in the present invention is: for detecting the simulation input combining unit degree of accuracy, proposes a kind of being based on and puts down
The detection method of equal power error.
To achieve these goals, the technical solution of the present invention is: a kind of simulation input combining unit degree of accuracy inspection
Survey method, using mean power error as the foundation judging the simulation input combining unit accuracy of measuring, by during band zero passage synchronization
The three-phase simulation standard source (hereinafter referred to as standard source) of clock output, three-phase standard electric energy meter, message analysis module device constitute mould
Intend input combining unit degree of accuracy testing circuit.
Described standard source is exportable synchronous with a phase voltage zero crossing while exporting three-phase simulation voltage, current signal
Pair when clock signal, described standard source three-phase simulation voltage output end and tested simulation input combining unit voltage input end and
Described three-phase standard electric energy meter voltage input end is connected in parallel；Described standard source three-phase simulation current output terminal is defeated with tested simulation
Enter combining unit current input terminal and described three-phase standard electric energy meter current input terminal is connected in series；Described standard source zero passage is synchronous
Pair when clock output be respectively connecting to tested simulation input combining unit synchronised clock input and described message analysis module with
Step clock input；The electrical energy pulse of described three-phase standard electric energy meter exports defeated to the standard electrical energy pulse of described message analysis module
Enter end；The sampled value of tested simulation input combining unit exports to message analysis module.
During the test of simulation input combining unit, described standard source exports the analog voltage of three-phase symmetrical, current signal, voltage
Current power factor adjustable, when synchronous pair of output, clock is synchronous with a phase voltage zero crossing, and synchronization accuracy is 0.2us, output electricity
The current voltage degree of accuracy is 0.02 grade, clock when clock signal format and tested simulation input combining unit pair when synchronous pair of output
Form is consistent, is irig_b code.
Described message analysis module receives the sample values of tested simulation input combining unit output and is reduced to
Voltage, current sample instantaneous value, refine temporal information clock signal when synchronous pair, by being calculated voltage x current sampling
It is worth corresponding average measured power value, described message analysis module carries out accumulated counts to standard electrical energy pulse and obtains standard electric energy
Value, obtains calibration power value divided by the testing time, the error of comparing calculation analytical standard performance number and average measured power value, with
This is as the degree of accuracy judging tested simulation input combining unit.
Described three-phase standard electric energy meter simulates electric energy meter for traditional standard, carries out magnitude tracing by traditional approach.
The invention has the beneficial effects as follows, testing result directly gives the average power error value of simulation input combining unit,
The metering performance of simulation input combining unit more can be embodied, detection project and equipment are few, test is simple, and labour intensity is little, traces to the source
To traditional standard electric energy meter, ability of tracing to the source is strong.
Brief description
Fig. 1 is detection method theory diagram.
Specific embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific embodiment is in technical solution of the present invention
Key content is described in detail.
Three-phase simulation standard source with zero passage synchronism output:
Standard source is by dds(digital signal synthesis) signal generator, ad modular converter, high-precision high-speed power amplifier,
Clock generation module is constituted.Dds signal generator produces adjustable three-phase digital voltage and current signal, through ad modular converter, height
Accurate power amplifier is converted to output analog voltage current signal, same in dds generator output numeral to ad modular converter
When export the synchronous signal of a road and a phase positive going zeror crossing point to clock generation module, clock generation module receives synchronizing signal, defeated
Clock signal when going out to meet synchronous pair of call format.
Mean power error calculates:
Message analysis module mainly completes mean power error calculating process, and implementation step is:
(1) n cycle, for initial time t1, is taken with clock signal a certain synchronization zero-cross moment when synchronous pair, t2 be n all
Another synchronization zero-cross moment after ripple；
(2) receive the sample values of tested simulation input combining unit output, be reduced to voltage, current sample wink
Duration；
(3) will voltage, current instantaneous value be multiplied, by corresponding for t1 to the t2 time period plesiochronous calculation of instantaneous power in the same time
Method calculates mean power p2；
(4) standard electric energy meter output pulse is counted, record umber of pulse in each synchronization zero-cross point, according to record
Umber of pulse, can get t1 to t2 time internal standard electric energy, and then can get standard value p1 of mean power；
(5) mean power error of tested combining unit is can get according to p1 and p2.
The foregoing describe the basic principles, principal features and advantages of the present invention, to one skilled in the art,
Under the general principle following the present invention, a little improvement can be done, these improvement also should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of simulation input combining unit method for detecting accuracy is it is characterised in that methods described is made with mean power error
For judging the foundation of the simulation input combining unit accuracy of measuring, by the three-phase simulation standard source exporting with zero passage synchronised clock,
Three-phase standard electric energy meter, message analysis module composition simulation input combining unit degree of accuracy testing circuit；
Output while exporting three-phase simulation voltage, current signal of described three-phase simulation standard source is same with a phase voltage zero crossing
Step pair when clock signal；Described three-phase simulation standard source three-phase simulation voltage output end and tested simulation input combining unit electricity
Pressure input and described three-phase standard electric energy meter voltage input end are connected in parallel；Described three-phase simulation standard source three-phase simulation electric current
Output end is connected in series with tested simulation input combining unit current input terminal and described three-phase standard electric energy meter current input terminal；
Described three-phase simulation standard source zero passage synchronised clock output is respectively connecting to tested simulation input combining unit synchronised clock input
End and described message analysis module synchronization input end of clock；The standard electrical energy pulse of described three-phase standard electric energy meter exports to described
The standard electrical energy pulse input of message analysis module；The voltage x current sample values output of tested simulation input combining unit
To message analysis module；
Described message analysis module receives the current-voltage sampling Value Data of tested simulation input combining unit output and is gone back
Originally it was voltage, current sample instantaneous value, refined temporal information clock signal when synchronous pair, by being calculated voltage x current
The corresponding average measured power value of sample values, described message analysis module carries out accumulated counts to standard electrical energy pulse and obtains
Standard energy value, obtains calibration power value, comparing calculation analytical standard performance number and average measured power value divided by the testing time
Error, in this, as the foundation of the degree of accuracy judging tested simulation input combining unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793077A (en) * | 2015-04-11 | 2015-07-22 | 国家电网公司 | Phase error detecting method of analog input combining unit |
| CN105866576A (en) * | 2016-04-01 | 2016-08-17 | 国家电网公司 | Simulation detection system of intelligent transformer station secondary-side electric energy metering error influence, and detection analysis method |
| CN105785085A (en) * | 2016-04-14 | 2016-07-20 | 云南电网有限责任公司电力科学研究院 | Merging unit detection analog source based on synchronous clock signal, and output method thereof |
| CN106125033B (en) * | 2016-07-19 | 2018-11-02 | 国网四川省电力公司电力科学研究院 | A kind of voltage and current synchronism classification error testing system |
| CN108241137B (en) * | 2017-12-18 | 2023-11-03 | 海南电网有限责任公司 | Basic error traceability device of merging unit tester |
| CN112505612B (en) * | 2020-10-26 | 2022-11-15 | 青岛鼎信通讯股份有限公司 | Standard meter electric energy pulse output method applied to electric energy meter calibrating device |
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Effective date of registration: 20180723 Address after: 330096 No. 88, min Qiang Road, private science and Technology Park, Nanchang, Jiangxi Co-patentee after: State Grid Corporation of China Patentee after: Power Science Research Institute of Jiangxi Electric Power Co., Ltd. Address before: 100761 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: State's net Jiangxi Province Electric power Science Academe Patentee before: State Grid Corporation of China |
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