CN102879760A - Method and device for checking errors of direct current electric energy meter by using standard alternating current electric energy meter - Google Patents
Method and device for checking errors of direct current electric energy meter by using standard alternating current electric energy meter Download PDFInfo
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- CN102879760A CN102879760A CN2012103724538A CN201210372453A CN102879760A CN 102879760 A CN102879760 A CN 102879760A CN 2012103724538 A CN2012103724538 A CN 2012103724538A CN 201210372453 A CN201210372453 A CN 201210372453A CN 102879760 A CN102879760 A CN 102879760A
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Abstract
The invention discloses a method and a device for checking errors of a direct current electric energy meter by using a standard alternating current electric energy meter. Alternating current is input to the standard alternating current meter, the alternating current is converted into direct current through direct current and then input to the direct current electric energy meter to be tested, and according to the principle that an effective value of the input alternating current of the standard alternating current electric energy meter and an effective value of the input direct current of the direct current electric energy meter to be tested are equivalent, errors of the direct current electric energy meter are checked by using the standard alternating current electric energy meter. According to the method and the device, the standard alternating current electric energy meter is used, so that errors of the direct current electric energy meter to be tested can be checked, and the method and the device are convenient to use.
Description
Technical field
The present invention relates to the error checking field of direct current energy meter, relate in particular to a kind of with the method and apparatus of AC energy standard scale realization to direct current energy meter error checking.
Background technology
At present, the accuracy of verification electric energy meter normally realizes with relative method, use exactly a high-precision standard electric energy meter and one by the school electric energy meter, connect simultaneously voltage source and current source, make standard electric energy meter and measured electric energy by the school electric energy meter, metering energy value by comparing these two electric energy meters or compare this two electrical energy pulses that electric energy meter sends is calculated by the school electric energy meter error.At present all is the system that adopts Alternating Current Power Supply and electricity consumption in the world, usefulness all be AC energy meter.And along with the development of green energy, the utilization of direct supply is more and more, such as direct current cabinet, solar powered, telecomm base station, subway, electric motorcar charging station etc.Also just be accompanied by a large amount of appearance of direct current energy meter, the manufacturers such as instrument wasion, Xu Ji are are constantly researching and developing direct current energy meter recently, and this has just required direct-current electric energy meter calibrating device, and the direct current standard scale will be arranged.But the direct current standard scale does not also occur at present, if replace the direct current standard scale to remove to examine and determine direct current energy meter with the interchange standard electric energy meter, should be an extraordinary scheme.
Summary of the invention
The purpose of this invention is to provide the realization of a kind of usefulness AC energy standard scale to the apparatus and method of direct current energy meter error checking, verification is easy to use.
The present invention adopts following technical proposals: a kind of method that realizes direct current energy meter error checking with the AC energy standard scale, alternating current is input to the AC energy standard scale, alternating current is input to tested direct current energy meter after overcommutation becomes DC current, the output signal of AC energy standard scale and the output signal of tested direct current energy meter are input to error calculation unit, the effective value that utilizes the input direct-current electric current of the input AC electric current of AC energy standard scale and tested direct current energy meter is the principle of equivalence, realizes with the AC energy standard scale direct current energy meter being carried out error checking.
The present invention also provides a kind of device of realizing the usefulness AC energy standard scale realization direct current energy meter error checking of said method, comprise the AC energy standard scale, ac current source, make the ac current source output transform to the output current transformer of required current value, the current sampling mutual inductor that the electric current of output current transformer output is sampled, error calculation unit, the output current of described current sampling mutual inductor is input to the AC energy standard scale, the output current of described current sampling mutual inductor also is input to tested direct current energy meter by current rectifying and wave filtering circuit, and the output pulse of described AC energy standard scale and the output pulse of tested direct current energy meter output to error calculation unit and carry out error calculating.
The output terminal of described current sampling mutual inductor also is connected with current compensation circuit.
The input current end of described interchange standard electric energy meter also is connected with current transformer, and the current feedback of current transformer output is to ac current source.
The present invention by utilizing AC energy standard scale metering alternating current and the DC current of tested direct current energy meter metering be this principle that equivalence equates, use the AC energy standard scale, just can finish the error checking of tested direct current energy meter, easy to use; DC current is through being provided with the current transformer sampling of band compensation before the rectifying and wave-filtering, guaranteed to be input to direct current energy meter and got direct current and have high precision, and reliability is high.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is that the direct current after alternating current and the rectification compares synoptic diagram.
Embodiment
As shown in Figure 1, with the device of AC energy standard scale realization to direct current energy meter error checking, comprise the AC energy standard scale, ac current source, make the ac current source output transform to the output current transformer of required current value, the current sampling mutual inductor that the electric current of output current transformer output is sampled, error calculation unit, the output current of described current sampling mutual inductor is input to the AC energy standard scale, the output current of described current sampling mutual inductor also is input to tested direct current energy meter by rectification circuit, the output pulse of described AC energy standard scale and the output pulse of tested direct current energy meter output to error calculation unit and carry out error calculating, finish the electrical energy pulse of standard scale and tested table and compare.The output terminal of described current sampling mutual inductor also is connected with current compensation circuit, for the exciting current that overcomes the sampling mutual inductor on the impact of electric current no-load voltage ratio precision, guarantee the secondary current precision with the self-balancing type current compensation circuit.The input current end of described interchange standard electric energy meter also is connected with current transformer, and the current feedback of current transformer output is used for revising the current precision of ac current source output to ac current source.
After ac current source is given the output current transformer, electric current is through the over-sampling mutual inductor, electric current after the conversion is sampled, the sampling mutual inductor has current compensation circuit, to guarantee the sampling precision of electric current, the electric current of sampling is input to the interchange standard scale and measures, and the alternating current of simultaneously current transformer output is through two half-wave rectifying circuit rectifications, become DC current, DC current is given tested direct current energy meter and is measured.Because alternating current and DC current are by rectifying conversion, so exchanging the alternating current of standard scale metering and the DC current of tested direct current energy meter metering is that equivalence equates, to be converted into energy value with direct current energy meter also be the same to AC energy meter like this, so just finally finishes to utilize to exchange standard scale to the error checking of direct current energy meter.
The present invention is a kind of with the method for AC energy standard scale realization to direct current energy meter error checking, alternating current is input to the interchange standard scale, alternating current is input to tested direct current energy meter after overcommutation becomes DC current, utilizing the effective value of DC current of the input of the input AC electric current of AC energy standard scale and tested direct current energy meter is the principle of equivalence, realizes with the AC energy standard scale direct current energy meter being carried out error checking.
Concrete principle is as follows: the definition of effective value: the square root of the mean value of integration square in one-period of each instantaneous value is expressed as
Be I1 if establish the DC current effective value, AC value is I2, definition according to effective value, electric current behind alternating current and the AC rectification should equate, the DC current that the value of as shown in Figure 2, the alternating current on the left side being given AC energy standard scale metering equals the right is given the value of tested direct current energy meter metering.The present invention realizes utilizing the AC energy standard scale to the error checking of direct current energy meter according to this principle.
Claims (4)
1. method that realizes direct current energy meter error checking with the AC energy standard scale, it is characterized in that: alternating current is input to the AC energy standard scale, alternating current is input to tested direct current energy meter after overcommutation becomes DC current, the output signal of AC energy standard scale and the output signal of tested direct current energy meter are input to error calculation unit, the effective value that utilizes the input direct-current electric current of the input AC electric current of AC energy standard scale and tested direct current energy meter is the principle of equivalence, realizes with the AC energy standard scale direct current energy meter being carried out error checking.
2. realize the as claimed in claim 1 device of the usefulness AC energy standard scale realization direct current energy meter error checking of method for one kind, it is characterized in that: comprise the AC energy standard scale, ac current source, make the ac current source output transform to the output current transformer of required current value, the current sampling mutual inductor that the electric current of output current transformer output is sampled, error calculation unit, the output current of described current sampling mutual inductor is input to the AC energy standard scale, the output current of described current sampling mutual inductor also is input to tested direct current energy meter by current rectifying and wave filtering circuit, and the output pulse of described AC energy standard scale and the output pulse of tested direct current energy meter output to error calculation unit and carry out error calculating.
3. according to claim 2 with the device of AC energy standard scale realization to direct current energy meter error checking, it is characterized in that: the output terminal of described current sampling mutual inductor also is connected with current compensation circuit.
4. according to claim 3 with the device of AC energy standard scale realization to direct current energy meter error checking, it is characterized in that: the input current end of described interchange standard electric energy meter also is connected with current transformer, and the current feedback of current transformer output is to ac current source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210372453.8A CN102879760B (en) | 2012-09-29 | 2012-09-29 | Method and device for checking errors of direct current electric energy meter by using standard alternating current electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210372453.8A CN102879760B (en) | 2012-09-29 | 2012-09-29 | Method and device for checking errors of direct current electric energy meter by using standard alternating current electric energy meter |
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| CN102879760A true CN102879760A (en) | 2013-01-16 |
| CN102879760B CN102879760B (en) | 2014-09-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995247A (en) * | 2014-05-28 | 2014-08-20 | 国家电网公司 | Electric energy meter calibrating apparatus for anechoic chamber |
| CN104749547A (en) * | 2015-03-12 | 2015-07-01 | 国家电网公司 | Novel on-site power meter calibration instrument |
| CN113655304A (en) * | 2021-07-13 | 2021-11-16 | 国网浙江省电力有限公司营销服务中心 | Online detection system and method for metering performance of electric vehicle charger |
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| US3849727A (en) * | 1973-08-10 | 1974-11-19 | Canadian Patents Dev | Current comparator for power and energy measurements |
| CN87201768U (en) * | 1987-02-05 | 1987-12-26 | 牡丹江市测试仪器厂 | Portable test unit for ac/dc electric meters |
| CN201859213U (en) * | 2010-11-11 | 2011-06-08 | 陕西电力科学研究院 | Intelligent energy meter verifying device |
| CN102253357A (en) * | 2011-04-01 | 2011-11-23 | 青岛乾程电子科技有限公司 | Pulse collector for mass watt-hour meter |
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2012
- 2012-09-29 CN CN201210372453.8A patent/CN102879760B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3849727A (en) * | 1973-08-10 | 1974-11-19 | Canadian Patents Dev | Current comparator for power and energy measurements |
| CN87201768U (en) * | 1987-02-05 | 1987-12-26 | 牡丹江市测试仪器厂 | Portable test unit for ac/dc electric meters |
| CN201859213U (en) * | 2010-11-11 | 2011-06-08 | 陕西电力科学研究院 | Intelligent energy meter verifying device |
| CN102253357A (en) * | 2011-04-01 | 2011-11-23 | 青岛乾程电子科技有限公司 | Pulse collector for mass watt-hour meter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995247A (en) * | 2014-05-28 | 2014-08-20 | 国家电网公司 | Electric energy meter calibrating apparatus for anechoic chamber |
| CN104749547A (en) * | 2015-03-12 | 2015-07-01 | 国家电网公司 | Novel on-site power meter calibration instrument |
| CN113655304A (en) * | 2021-07-13 | 2021-11-16 | 国网浙江省电力有限公司营销服务中心 | Online detection system and method for metering performance of electric vehicle charger |
| CN113655304B (en) * | 2021-07-13 | 2024-03-22 | 国网浙江省电力有限公司营销服务中心 | System and method for online detection of metering performance of electric vehicle charger |
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| CN102879760B (en) | 2014-09-17 |
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