CN204142951U - A kind of electric energy meter error calibration equipment - Google Patents
A kind of electric energy meter error calibration equipment Download PDFInfo
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- CN204142951U CN204142951U CN201420601055.3U CN201420601055U CN204142951U CN 204142951 U CN204142951 U CN 204142951U CN 201420601055 U CN201420601055 U CN 201420601055U CN 204142951 U CN204142951 U CN 204142951U
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Abstract
The utility model provides a kind of electric energy meter error calibration equipment, and this device comprises that signal generator divides, segment signal output, three-phase standard scale and Error Calculator; Described signal generator is divided and is connected with described segment signal output by power amplifier, and it is connected with described three-phase standard scale with described Error Calculator respectively by main control MCU; Described segment signal output comprises the stepup transformer be connected with described three-phase standard scale and tested electric energy meter respectively and the current lifting device be connected with described three-phase standard scale and described tested electric energy meter respectively; Described three-phase standard scale is connected with described Error Calculator and described tested electric energy meter respectively.This device can apply live wire, the neutral line current value of different value simultaneously, and changeable selection phase line, neutral line current carry out electric energy error detection, make verification result more comprehensive.
Description
Technical field:
The utility model relates to a kind of calibration equipment, specifically relates to a kind of electric energy meter error calibration equipment.
Background technology:
Electric energy meter checking device is specially electric system inspection electrical network measurement meter kinematic error and fault detect and design.Operating personnel can be rapid by electric energy meter checking device, safe and reliable the measurement meter error recorded and wiring error, for measurement of power personnel correctly measure, remedy electricity and provide effective foundation.Electric energy meter checking device comprises current measurement circuit, voltage measurement circuit, power source module and display module, drastically increases the convenience of use.
In Q/GDW 364-2009 " single-phase intelligent electric energy meter technical manual ", regulation electric energy meter checking device must possess following functions: " can measure, record, show the operational factors such as the voltage of tested electric energy meter, electric current (comprising neutral line current), power, power factor.Measuring error (fiducial error) is no more than ± and 1% "; In order to electricity theft prevention, electric energy meter checking device need measure the neutral line current of tested electric energy meter.Conventional single-phase electric energy meter calibration equipment can only independent measurement neutral line current or live wire electric current, can not measure simultaneously; And adopt conventional three-phase electric energy meter calibration equipment can the current source of A, B phase is applied on the live wire of electric energy meter, zero line, but now the phase angle of neutral line current is not inconsistent with live wire, and what standard scale measured simultaneously is two-phase electric energy, is not also inconsistent with actual single-phase electric energy.
Utility model content:
In order to overcome above-mentioned deficiency existing in prior art, the utility model provides a kind of electric energy meter error calibration equipment, this device can apply live wire, the neutral line current value of different value simultaneously, and changeable selection phase line, neutral line current carry out electric energy error detection, make verification result more comprehensive.
The technical scheme that the utility model provides is: a kind of electric energy meter error calibration equipment, comprises that signal generator divides, segment signal output, three-phase standard scale and Error Calculator; Its improvements are: described signal generator is divided and is connected with described segment signal output by power amplifier, and it is connected with described three-phase standard scale with described Error Calculator respectively by main control MCU; Described segment signal output comprises the stepup transformer be connected with described three-phase standard scale and tested electric energy meter respectively and the current lifting device be connected with described three-phase standard scale and described tested electric energy meter respectively; Described three-phase standard scale is connected with described Error Calculator and described tested electric energy meter respectively.
Preferably, described signal generator divides and comprises PC, main control MCU, DSP high speed numerical processor, D/A converter and power amplifier; Described PC, described main control MCU, described DSP high speed numerical processor, described D/A converter and described power amplifier connect successively.
Further, described power amplifier comprises A phase voltage power amplifier, A phase current power amplifier, B phase current power amplifier; The output that described D/A converter comprises the output be connected with described A phase voltage power amplifier input, the output be connected with described A phase current power amplifier input and is connected with described B phase current power amplifier input.
Preferably, described segment signal output comprises merit and cuts case, stepup transformer, current lifting device (1) and current lifting device (2); Described stepup transformer, described current lifting device (1) and described current lifting device (2) are cut case respectively by merit and are connected with described main control MCU; The output that described stepup transformer comprises the input be connected with the output terminal of A phase voltage power amplifier, the output be connected with described three-phase standard scale and is connected with described tested electric energy meter; Described current lifting device (1) comprises the input be connected with the output terminal of A phase current power amplifier, the output be connected with described three-phase standard scale A phase end of incoming cables and to fire the input that line end is connected with described tested electric energy meter; Described current lifting device (2) comprises the input be connected with the output terminal of B phase current amplifier, the output be connected with described three-phase standard scale B phase end of incoming cables and goes out with described tested electric energy meter the input that zero line side is connected.
Further, described stepup transformer is connected with described A phase voltage power amplifier by feedback circuit; Described current lifting device (1) is connected with described A phase current power amplifier by described feedback circuit; Described current lifting device (2) is connected with described B phase current power amplifier by described feedback circuit.
Further, the described signal output part of three-phase standard scale is connected with the input end of error calculation unit; The signal output part of described tested electric energy meter is connected with another input end of described error calculation unit.
Further, described main control MCU comprises the port be connected with local keyboard and the port be connected with display.
Further, the A phase leading-out terminal of described three-phase standard scale is connected with the live wire end that enters of described tested electric energy meter; The B phase leading-out terminal of described three-phase standard scale is connected with the zero line side that enters of described tested electric energy meter.
Compared with immediate technical scheme, the utility model has following marked improvement:
This calibration equipment can apply live wire, the neutral line current of different value simultaneously, by the A phase current of three-phase standard scale being accessed the live wire loop of tested electric energy meter, the B phase current of three-phase standard scale is accessed the zero line loop of tested electric energy meter, and follow the tracks of A phase voltage phase place, standard scale can be selected by live wire or zero line metering electric energy error, thus the existing phenomenon of simulation stealing, the metering policies of test electric energy meter when stealing.
Accompanying drawing illustrates:
Fig. 1 is the structure principle chart of this device;
Fig. 2 is the catenation principle figure of current lifting device and three-phase standard scale and tested electric energy meter in Fig. 1.
Embodiment:
In order to understand the utility model better, below in conjunction with Figure of description and example, content of the present utility model is described further.
The schematic diagram of device that the utility model provides is as shown in Figure 1: comprise PC, local keyboard, display, main control MCU, merit cuts case, DSP high speed numerical processor, D/A converter, A phase voltage power amplifier, A phase current power amplifier, B phase current power amplifier, stepup transformer, current lifting device (1), current lifting device (2), three-phase standard scale, tested electric energy meter and error calculation unit;
When adopting local control, local keyboard output voltage, current order are to main control MCU; When adopting Long-distance Control, PC output voltage, current order are to main control MCU; Main control MCU is cut case by merit and is carried out according to the voltage received, current order the output that gear switch controls stepup transformer and current lifting device, and the state of standard scale under setting current state, simultaneously by voltage, electric current and phase data information transmission to DSP high speed numerical processor; The voltage and current signal that display display main control MCU exports;
DSP high speed numerical processor produces three railway digital signals according to information such as voltage, electric current and phase places: comprise the digital signal representing hot voltage, represent the digital signal of live wire electric current, represent the digital signal of neutral line current, and three railway digital signal real time high-speeds are sent to D/A converter; D/A converter carries out the three road waveform signals of DA conversion afterwards required for synthesis to receiving digital signal: comprise the waveform signal representing hot voltage, represent the waveform signal of live wire electric current, represent the waveform signal of neutral line current; Wherein live wire current phase is identical with neutral line current phase place.
The waveform signal representing hot voltage is exported to A phase voltage power amplifier by D/A converter, the waveform signal representing live wire electric current is exported to A phase current power amplifier, the waveform signal representing neutral line current is exported to B phase current power amplifier;
A phase voltage power amplifier exports to stepup transformer after carrying out power amplification to hot voltage signal, A phase current power amplifier exports to current lifting device (1) after carrying out power amplification to live wire electric current, and B phase current power amplifier exports to current lifting device (2) after neutral line current is carried out power amplification.
Stepup transformer is connected with three-phase standard scale and tested electric energy meter respectively by voltage transformer pt, and by signal feedback circuit, output voltage is fed back to A phase voltage power amplifier, and the voltage signal that stepup transformer exports measured respectively by three-phase standard scale and tested electric energy meter.
As shown in Figure 2: three-phase standard scale is connected with tested electric energy meter, wherein 1 on tested electric energy meter is for entering live wire end, and 2 is the line end that fires, and 3 for entering zero line side, and 4 for going out zero line side; 1 of three-phase standard scale is A phase end of incoming cables, and 2 is A phase leading-out terminal, and 3 is B phase end of incoming cables, and 4 is B phase leading-out terminal, and this device has only used A, B phase of three-phase standard scale, and the C eliminating three-phase standard scale in Fig. 2 connects line end;
The A phase end of incoming cables 1 of the output termination three-phase standard scale of current lifting device (1), what the A phase leading-out terminal 2 of three-phase standard scale connect tested electric energy meter enters live wire end 1, and the line end 2 that fires of tested electric energy meter connects the input end of current lifting device (1); Current lifting device (1) exports the current signal of simulated fire line current, and this current signal is fed back to A phase current power amplifier by signal feedback circuit;
The output terminal of current lifting device (2) is connected with the B phase end of incoming cables 3 of three-phase standard scale, the B phase leading-out terminal 4 of three-phase standard scale is connected with the zero line side 3 that enters of tested electric energy meter by 1:1 isolation transformer CT, and the zero line side 4 that goes out of tested electric energy meter is connected with the input end of current lifting device (2) by 1:1 isolation transformer CT; Current lifting device (2) exports the current signal of analogue zero line current, and this current signal is fed back to B phase current power amplifier by signal feedback circuit.
As shown in Figure 1: three-phase standard scale and tested electric energy meter measure live wire electric energy and zero line electric energy according to the live wire electric current measured and neutral line current, and change into the pulse signal be directly proportional to electric energy, main control MCU is after the stable output of source, read the data that three-phase standard scale is measured, control the correction of three-phase standard scale after these data and theoretical value being compared and output pulse signal to error calculation unit, then main control MCU carries out passage bridge according to parameters to the Puled input of tested electric energy meter; And departure computing unit carries out error testing according to the input pulse of the input pulse of three-phase standard scale and tested electric energy meter.Consider that live wire electric current and neutral line current need to test simultaneously, and measuring current is not of uniform size to be caused, live wire electric current adopts A phase current power amplifier to export, the neutral line current of tested electric energy meter adopts B phase current power amplifier to export, and Phase Tracking A phase voltage phase place, the A phase current of three-phase standard scale accesses the live wire loop of tested reometer, the B phase current of three-phase standard scale accesses the zero line loop of tested electric energy meter through isolation CT, utilize the method realize the inspection respectively of live wire loop and zero line loop electric energy or two loops simultaneously loading current test.
These are only embodiment of the present utility model, be not limited to the utility model, all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all applying within the right of the present utility model awaited the reply.
Claims (8)
1. an electric energy meter error calibration equipment, comprises that signal generator divides, segment signal output, three-phase standard scale and Error Calculator; It is characterized in that: described signal generator is divided and is connected with described segment signal output by power amplifier, it is connected with described three-phase standard scale with described Error Calculator respectively by main control MCU; Described segment signal output comprises the stepup transformer be connected with described three-phase standard scale and tested electric energy meter respectively and the current lifting device A (1), the current lifting device B (2) that are connected with described three-phase standard scale and described tested electric energy meter respectively; Described three-phase standard scale is connected with described Error Calculator and described tested electric energy meter respectively.
2. a kind of electric energy meter error calibration equipment as claimed in claim 1, is characterized in that:
Described signal generator divides and comprises PC, main control MCU, DSP high speed numerical processor, D/A converter and power amplifier; Described PC, described main control MCU, described DSP high speed numerical processor, described D/A converter and described power amplifier connect successively.
3. a kind of electric energy meter error calibration equipment as claimed in claim 2, is characterized in that:
Described power amplifier comprises A phase voltage power amplifier, A phase current power amplifier, B phase current power amplifier; The output that described D/A converter comprises the output be connected with described A phase voltage power amplifier input, the output be connected with described A phase current power amplifier input and is connected with described B phase current power amplifier input.
4. a kind of electric energy meter error calibration equipment as claimed in claim 1, is characterized in that:
Described segment signal output comprises merit and cuts case, stepup transformer, current lifting device A (1) and current lifting device B (2); Described stepup transformer, described current lifting device A (1) and described current lifting device B (2) cut case respectively by merit and are connected with described main control MCU; The output that described stepup transformer comprises the input be connected with the output terminal of A phase voltage power amplifier, the output be connected with described three-phase standard scale and is connected with described tested electric energy meter; Described current lifting device A (1) comprises the input be connected with the output terminal of A phase current power amplifier, the output be connected with described three-phase standard scale A phase end of incoming cables and to fire the input that line end is connected with described tested electric energy meter; Described current lifting device B (2) comprises the input be connected with the output terminal of B phase current amplifier, the output be connected with described three-phase standard scale B phase end of incoming cables and goes out with described tested electric energy meter the input that zero line side is connected.
5. a kind of electric energy meter error calibration equipment as claimed in claim 4, is characterized in that:
Described stepup transformer is connected with described A phase voltage power amplifier by feedback circuit; Described current lifting device A (1) is connected with described A phase current power amplifier by described feedback circuit; Described current lifting device B (2) is connected with described B phase current power amplifier by described feedback circuit.
6. a kind of electric energy meter error calibration equipment as claimed in claim 4, is characterized in that:
The described signal output part of three-phase standard scale is connected with the input end of error calculation unit; The signal output part of described tested electric energy meter is connected with another input end of described error calculation unit.
7. a kind of electric energy meter error calibration equipment as claimed in claim 2, is characterized in that:
Described main control MCU comprises the port be connected with local keyboard and the port be connected with display.
8. a kind of electric energy meter error calibration equipment of stating of claim 5, is characterized in that:
The A phase leading-out terminal of described three-phase standard scale is connected with the live wire end that enters of described tested electric energy meter; The B phase leading-out terminal of described three-phase standard scale is connected with the zero line side that enters of described tested electric energy meter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420601055.3U CN204142951U (en) | 2014-10-17 | 2014-10-17 | A kind of electric energy meter error calibration equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420601055.3U CN204142951U (en) | 2014-10-17 | 2014-10-17 | A kind of electric energy meter error calibration equipment |
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| CN204142951U true CN204142951U (en) | 2015-02-04 |
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| CN201420601055.3U Active CN204142951U (en) | 2014-10-17 | 2014-10-17 | A kind of electric energy meter error calibration equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501762A (en) * | 2016-12-30 | 2017-03-15 | 国网山东省电力公司电力科学研究院 | The device and method of through type or jaw type calibrating is carried out to on-site calibrator |
| CN106526526A (en) * | 2016-12-08 | 2017-03-22 | 国网四川省电力公司电力科学研究院 | Test device for digital metering system |
| CN108919171A (en) * | 2018-06-29 | 2018-11-30 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault tester |
| CN111239673A (en) * | 2020-02-07 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | System and method for detecting residual current metering precision of electric energy meter |
| CN111896909A (en) * | 2020-07-16 | 2020-11-06 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN112748389A (en) * | 2019-10-31 | 2021-05-04 | 河南许继仪表有限公司 | On-site intelligent single-phase electric energy meter fault diagnosis instrument |
-
2014
- 2014-10-17 CN CN201420601055.3U patent/CN204142951U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526526A (en) * | 2016-12-08 | 2017-03-22 | 国网四川省电力公司电力科学研究院 | Test device for digital metering system |
| CN106501762A (en) * | 2016-12-30 | 2017-03-15 | 国网山东省电力公司电力科学研究院 | The device and method of through type or jaw type calibrating is carried out to on-site calibrator |
| CN106501762B (en) * | 2016-12-30 | 2019-04-09 | 国网山东省电力公司电力科学研究院 | The device and method of through type or jaw type calibrating is carried out to on-site calibrator |
| CN108919171A (en) * | 2018-06-29 | 2018-11-30 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault tester |
| CN108919171B (en) * | 2018-06-29 | 2023-12-26 | 国网宁夏电力有限公司固原供电公司 | Ammeter internal fault check meter |
| CN112748389A (en) * | 2019-10-31 | 2021-05-04 | 河南许继仪表有限公司 | On-site intelligent single-phase electric energy meter fault diagnosis instrument |
| WO2021082531A1 (en) * | 2019-10-31 | 2021-05-06 | 河南许继仪表有限公司 | On-site fault diagnosis instrument for intelligent single-phase electric energy meter |
| CN111239673A (en) * | 2020-02-07 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | System and method for detecting residual current metering precision of electric energy meter |
| CN111896909A (en) * | 2020-07-16 | 2020-11-06 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
| CN111896909B (en) * | 2020-07-16 | 2023-07-25 | 河南省计量科学研究院 | Electric energy meter error correction method and device |
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