CN204228946U - A kind of electric energy meter error calibrating installation - Google Patents
A kind of electric energy meter error calibrating installation Download PDFInfo
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- CN204228946U CN204228946U CN201420639567.9U CN201420639567U CN204228946U CN 204228946 U CN204228946 U CN 204228946U CN 201420639567 U CN201420639567 U CN 201420639567U CN 204228946 U CN204228946 U CN 204228946U
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Abstract
A kind of electric energy meter error calibrating installation, described device is made up of current source, standard scale, current harmonics generator and balanced impedance; The electric current of current source inputs high-end connection standard table, and high-end by the electric current input of standard scale connection current harmonics generator; The electric current input low side of current source directly connects the electric current input low side of current harmonics generator; The current harmonics bypass that balanced impedance two ends connect current harmonics generator respectively exports high-end and current harmonics bypass output low side; The current harmonics then being connected current harmonics generator respectively by taking temperature exports high-end and current harmonics output low side.The utility model constitutes by employing two differential operational amplifiers and a comparer harmonic wave generating device that can produce direct current and even-order harmonic, thus realizes carrying out error testing to electric energy meter.This device is simple, practical.
Description
technical field
The utility model relates to a kind of electric energy meter error calibrating installation under direct current and even-order harmonic impact, belongs to electric-power metering detection technique field.
Background technology
Along with the development of science and technology, a large amount of novel non-linearity power electronic equipment is widely used, and meanwhile, they are also filled with the various electromagnetic interference (EMI) such as harmonic wave to electrical network.The impact of harmonic wave on measuring accuracy of electric energy meter is subject to people's attention day by day.Standard GB/T/T 17215.321-2008 alternating current measuring equipment particular/special requirement the 21st part: state type active electric energy meter (1 grade and 2 grades) 8.2.3 article requires to carry out direct current and even-order harmonic impact test to electric energy meter, and provide reference test circuit, its sketch as shown in Figure 1, requires that the ammeter percentage error knots modification recorded under special harmonic wave forms should not exceed the knots modification limit of regulation.
For above Standard, the power supply of electric energy meter calibrating apparatus needs to export the direct current and even-order harmonic waveform that meet Standard, current source both domestic and external cannot produce this special waveform or create waveform and but not provide enough driving forces, cannot meet the needs of electric energy meter calibration.
Direct current and even-order harmonic test circuit require that balanced impedance is strictly equal with tested table impedance, otherwise the waveform produced just does not reach requirement, does not reach the accuracy of measurement.
Before general impedance matching methods is manual mode, concrete grammar is: manually connect an impedance equal with tested table impedance or be that balanced impedance is done experiment with the table of tested table same model, because the impedance of tested table is different, the impedance connecting wire can not be determined, so manually connect the method complex operation of impedance, test findings is also inaccurate.Strictly equal with tested table impedance in order to reach balanced impedance, all adopt at present and singly show calibrating, and adopt works as balanced impedance with the table of tested table same model more, test lead is also strictly identical, but the connection of two circuit connections can not be completely the same, even if the impedance in two loops has the difference of a few milliohm that output waveform all can be caused not reach testing requirements, so need a kind of method carrying out automatic adjustment impedance magnitude according to the impedance magnitude of tested table.
summary of the invention
The purpose of this utility model is, cannot produce the problem of direct current and the even-order harmonic waveform meeting Standard in order to solve existing power supply; The utility model discloses a kind of electric energy meter error calibrating installation under direct current and even-order harmonic impact.
The technical solution of the utility model is, the utility model electric energy meter error calibrating installation is become with balance resistor group by current source, standard scale, current harmonics generator.The electric current of current source inputs high-end connection standard table, and high-end by the electric current input of standard scale connection current harmonics generator; The electric current input low side of current source directly connects the electric current input low side of current harmonics generator; The current harmonics bypass that balance resistance two ends connect current harmonics generator respectively exports high-end and current harmonics bypass output low side; The current harmonics then being connected current harmonics generator respectively by taking temperature exports high-end and current harmonics output low side.
Described current harmonics generator comprises the first differential operational amplifier detecting tested table two ends pressure drop, the second differential operational amplifier detecting the two ends pressure drop of balanced impedance circuit and comparer; The input end of described first differential operational amplifier connects the two ends of tested table; The input end of described second differential operational amplifier connects the two ends of balanced impedance; The output terminal of two differential operational amplifiers connects the input end of a comparer respectively; The output terminal of comparer connects balanced impedance.
Described balanced impedance is the conduction impedance of field effect transistor.
The beneficial effects of the utility model are, the utility model constitutes by employing two differential operational amplifiers and a comparer harmonic wave generating device that can produce direct current and even-order harmonic, thus realize carrying out error testing to electric energy meter.This device is simple, practical.
accompanying drawing explanation
Fig. 1 is the structural plan of the utility model device;
Fig. 2 is the composition schematic diagram of current harmonics generator of the present utility model;
Fig. 3 is current harmonics generator tested table two ends voltage drop detection circuit figure;
Fig. 4 is current harmonics generator balanced impedance two ends voltage drop detection circuit figure;
Fig. 5 is current harmonics generator comparator circuit;
In figure, 1 is current source; 2 is standard scales; 3 is current harmonics generators; 4 is tested tables; 5 is balanced impedances; 11 refer to that tested table voltage drop detection exports; 12 refer to that balanced impedance voltage drop detection exports; 13 finger fet gate; 31 is first differential operational amplifiers; 32 is second differential operational amplifiers; 33 is comparers; Ia is that electric current input is high-end; Iao is electric current input low side; Ia-1 is that current harmonics output is high-end; Iao-1 is that current harmonics exports low side; Ia-2 is that current harmonics bypass output is high-end; Iao-2 is that current harmonics bypass exports low side.
Embodiment
Embodiment of the present utility model as shown in the figure.
Fig. 1 be the present embodiment structural plan, a kind of electric energy meter error calibrating installation of the present embodiment is made up of current source 1, standard scale 2, current harmonics generator 3 and balanced impedance 5.The electric current of current source 1 inputs high-end connection standard table 2, and high-end by the electric current input of standard scale connection current harmonics generator 3; The electric current input low side of current source 1 directly connects the electric current input low side of current harmonics generator 3; The current harmonics bypass that balanced impedance 5 two ends connect current harmonics generator 3 respectively exports high-end and current harmonics bypass output low side; The current harmonics that tested table 4 item connects current harmonics generator 3 respectively exports high-end and current harmonics output low side.
In the present embodiment, as shown in Figure 2, current harmonics generator 3 comprises the first differential operational amplifier 31 detecting tested table two ends pressure drop, the second differential operational amplifier 32 detecting the two ends pressure drop of balanced impedance circuit and comparer 33.Comparer 33 adopts operational amplifier, and balanced impedance is field effect transistor.
The operating circuit of the first differential operational amplifier 31 as shown in Figure 3.One end of tested table connects the positive input of the first differential operational amplifier, and the other end of tested table connects the reverse input end of the first differential operational amplifier by a resistance; The output terminal of the first differential operational amplifier 31 connect comparer operational amplifier positive input.
The operating circuit of the second differential operational amplifier 32 as shown in Figure 4.Source electrode as the field effect transistor of balanced impedance connects the positive input of the second differential operational amplifier, and the drain electrode of field effect transistor connects the reverse input end of the second differential operational amplifier by a resistance; The output terminal of the second differential operational amplifier 32 connect comparer operational amplifier reverse input end.
In the present embodiment, comparer is operational amplifier, and as shown in Figure 5, wherein, tested table voltage drop detection exports the reverse input end that 11 are connected to comparer operational amplifier to its operating circuit; Balanced impedance voltage drop detection exports the positive input that 12 are connected to comparer operational amplifier; The output termination fet gate of comparer operational amplifier.
The principle of work of the present embodiment device is, current source sine wave output shape electric current divides two-way by two commutation diodes, one tunnel is that direct current and even-order harmonic are to tested table, another road bypasses through balanced impedance, here balanced impedance must be equal with tested table impedance, otherwise direct current even-order harmonic is inaccurate.In order to make balanced impedance equal with tested table impedance, adopt the close-loop feedback shown in Fig. 2 to control, as long as the pressure drop making balanced impedance and tested table produce is equal, the impedance of this two-way is just necessarily equal.
Claims (3)
1. an electric energy meter error calibrating installation, is characterized in that, described device is made up of current source, standard scale, current harmonics generator and balanced impedance; The electric current of current source inputs high-end connection standard table, and high-end by the electric current input of standard scale connection current harmonics generator; The electric current input low side of current source directly connects the electric current input low side of current harmonics generator; The current harmonics bypass that balanced impedance two ends connect current harmonics generator respectively exports high-end and current harmonics bypass output low side; The current harmonics then being connected current harmonics generator respectively by taking temperature exports high-end and current harmonics output low side.
2. a kind of electric energy meter error calibrating installation according to claim 1, it is characterized in that, described current harmonics generator comprises the first differential amplifier amplifier detecting tested table two ends pressure drop, the second differential amplifier amplifier and the comparer detecting the two ends pressure drop of balanced impedance circuit; The input end of described first differential amplifier amplifier connects the two ends of tested table; The input end of described second differential amplifier amplifier connects the two ends of balanced impedance; The output terminal of two differential amplifier amplifiers connects the input end of a comparer respectively; The output terminal of comparer connects balanced impedance.
3. a kind of electric energy meter error calibrating installation according to claim 1, is characterized in that, described balanced impedance is the conduction impedance of field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420639567.9U CN204228946U (en) | 2014-10-31 | 2014-10-31 | A kind of electric energy meter error calibrating installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420639567.9U CN204228946U (en) | 2014-10-31 | 2014-10-31 | A kind of electric energy meter error calibrating installation |
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| Publication Number | Publication Date |
|---|---|
| CN204228946U true CN204228946U (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420639567.9U Expired - Fee Related CN204228946U (en) | 2014-10-31 | 2014-10-31 | A kind of electric energy meter error calibrating installation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425199A (en) * | 2015-11-27 | 2016-03-23 | 深圳市科陆驱动技术有限公司 | Apparatus and method of direct-current even harmonic influence experiment of electric energy meter |
| CN106772209A (en) * | 2017-01-11 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | For electric energy meter direct current and the load automatic matching device of even-order harmonic influence experiment |
| CN106959427A (en) * | 2017-03-22 | 2017-07-18 | 国网江西省电力公司电力科学研究院 | A kind of anti-DC performance hanging net operation verification experimental verification method of electric power meter |
-
2014
- 2014-10-31 CN CN201420639567.9U patent/CN204228946U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425199A (en) * | 2015-11-27 | 2016-03-23 | 深圳市科陆驱动技术有限公司 | Apparatus and method of direct-current even harmonic influence experiment of electric energy meter |
| CN105425199B (en) * | 2015-11-27 | 2019-01-22 | 深圳市科陆驱动技术有限公司 | A kind of electric energy meter direct current even-order harmonic influences the device and method of experiment |
| CN106772209A (en) * | 2017-01-11 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | For electric energy meter direct current and the load automatic matching device of even-order harmonic influence experiment |
| CN106772209B (en) * | 2017-01-11 | 2023-07-04 | 国网江西省电力公司电力科学研究院 | Automatic load matching device for electric energy meter direct current and even harmonic influence test |
| CN106959427A (en) * | 2017-03-22 | 2017-07-18 | 国网江西省电力公司电力科学研究院 | A kind of anti-DC performance hanging net operation verification experimental verification method of electric power meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150325 Termination date: 20211031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |