CN210005677U - Electric energy meter basic error testing device considering temperature and current change - Google Patents
Electric energy meter basic error testing device considering temperature and current change Download PDFInfo
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- CN210005677U CN210005677U CN201920715416.XU CN201920715416U CN210005677U CN 210005677 U CN210005677 U CN 210005677U CN 201920715416 U CN201920715416 U CN 201920715416U CN 210005677 U CN210005677 U CN 210005677U
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Abstract
The utility model discloses an electric energy meter basic error testing arrangement of considering temperature and current change, it includes to be surveyed electric energy meter and standard meter, the voltage and the current output of power supply link to each other with standard meter and surveyed electric energy meter respectively, the electric energy pulse of being surveyed electric energy meter and standard meter output is connected to the error calculation unit, the error calculation unit is connected with total accuse center, total accuse center and PC are connected, solved prior art and only considered the electric energy meter environmental suitability examination mode of single volume influence and can not carry out the accurate description to the situation under the influence of actual multifactor, when the electric energy meter moves under actual site environment, under a plurality of influence volume coactions such as temperature, current change, the measurement characteristic of electric energy meter often appears technical problem such as unusual.
Description
Technical Field
The utility model belongs to the electric energy measurement technique, concretely relates to electric energy meter basic error testing arrangement who considers temperature and current variation.
Background
Along with the rapid development of the smart power grid, the smart electric energy meter is widely applied to as an important component of the smart power grid, correspondingly, higher requirements on the performance of the electric energy meter are also provided, the updating and upgrading of the electric energy meter are realized, and a large amount of corresponding electric energy meter calibrating devices are put into use.
When a laboratory tests the single influence quantity of the electric energy meter, although the error change quantity of the electric energy meter meets the standard regulation, when the electric energy meter runs in the actual field environment, the metering characteristic of the electric energy meter is often abnormal under the combined action of a plurality of influence quantities such as temperature and current changes, and the like.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide electric energy meter basic error testing arrangement of considering temperature and current variation to solve prior art and only consider the electric energy meter environmental suitability examination mode of single volume influence and can not carry out the accurate description to the situation under the influence of actual multifactor, when the electric energy meter moves under actual site environment, under a plurality of influence volume combined action such as temperature, current variation, the measurement characteristic of electric energy meter often appears technical problem such as unusual.
The utility model adopts the technical scheme that:
A basic error testing device for an electric energy meter considering temperature and current changes comprises a tested electric energy meter and a standard meter, wherein voltage and current output ends of a power source are respectively connected with the standard meter and the tested electric energy meter, electric energy pulses output by the tested electric energy meter and the standard meter are connected to an error calculating unit, the error calculating unit is connected with a master control center, and the master control center is connected with a PC.
The device also comprises a temperature test box, wherein a meter hanging frame is fixed in the temperature test box, and the electric energy meter to be tested is hung on the meter hanging frame.
The error calculation unit is connected with the master control center through a CAN bus.
The error calculation unit is an ARM unit board.
The test method of the basic error test device of the electric energy meter considering the temperature and the current change comprises the following steps:
step 1, the power source outputs voltage and current waveforms of
In the formula of UnomIs the nominal value of the voltage, f, of the electrical energy meter under testnomIs a nominal value of frequency, ItestIn order to be the current signal amplitude,
initial phase angles of voltage and current signals are respectively;
step 2, setting the temperature test box at 23 ℃, and setting the phase angle difference of voltage and current to be 0 through the power source, namely
Amplitude of the current ItestIs 10Itr，ItrThe basic error v of the tested electric energy meter is obtained through the error calculating unit for the turning current of the electric energy meterBasic＝(EIs measured-EStandard of merit)/EStandard of merit×100％，EStandard of meritElectric energy value measured by a standard meter, EIs measuredRepresenting the electric energy value measured by the measured electric energy meter;
step 3, keeping the temperature test box at 23 ℃, and setting a current amplitude ItestIs kItrThe error calculating unit obtains the metering error v of the measured electric energy meter when the current changes1Thereby obtaining an error offset v of the current changeElectric current＝|ν1-νBasic|；
Step 4, keeping the current amplitude to be 10ItrSetting a temperature test box at 23 +/-X ℃, wherein X meets the requirement of 23 +/-X and is the temperature range of normal work of the electric energy meter, and obtaining an electric energy metering error v during temperature change by an error unit2Thereby obtaining an error offset v of the temperature changeTemperature of＝|ν2-νBasic|；
Step five, v obtained by the stepBasic，νElectric current，νTemperature ofThe error test result of the electric energy meter under the conditions of current change and temperature change is considered at the same time:
amplitude of the current kItrK is such that Imin≤kItr≤Imax，Imin，ImaxThe minimum and maximum currents of the electric energy meter in normal operation are shown.
The utility model has the advantages that:
the utility model discloses an accomplish the electric energy meter basic error test of considering temperature and current variation simultaneously, the defect of electric energy metering error under only considering single influence has been improved in current electric energy meter test experiment, provide the technical support that was decided for step deep research electric energy meter actual condition environment's adaptability examination technique, thereby promote electric energy metering industry technical level, promote and perfect measurement test detection ability, important economic benefits and social have, the electric energy meter environmental suitability examination mode of having solved prior art and only considering single volume influence can not carry out the accurate description to the situation under the influence of actual multifactor, when the electric energy meter moves under actual site environment, at temperature, under a plurality of influence volume combined action such as current variation, technical problem such as unusual often appears in the measurement characteristic of electric energy meter.
Drawings
Fig. 1 is a schematic structural diagram of the device of the present invention.
Detailed Description
A basic error testing device for electric energy meters considering temperature and current changes comprises a tested electric energy meter and a standard meter, wherein voltage and current output ends of a power source are respectively connected with voltage and current ports of the standard meter and the tested electric energy meter, an error calculating unit is connected with a master control center, the master control center is connected with a PC (personal computer), electric energy pulses output by the tested electric energy meter and the standard meter are connected to a timer of the error calculating unit to realize pulse counting, the error calculating unit respectively transmits electric energy metering errors of the tested meter and the standard meter under current changes and temperature changes to the PC end through the master control center to complete basic error testing of the electric energy meter, the output current of the power source is 0.1 mA-120A, and the standard meter is at least grades higher than the grade of the brand of the tested electric energy meter.
The device also comprises a temperature test box, wherein a meter hanging frame is fixed in the temperature test box, and the electric energy meter to be tested is hung on the meter hanging frame. The error calculation unit is connected with the CAN bus, and error data of the tested electric energy meter are transmitted to the master control center and the PC through the CAN bus communication mode.
The error calculation unit is an ARM unit board. The characteristic that ARM chip resources are abundant is fully utilized, the direct input of the pulse signals of the multi-path tested electric energy meter and the pulse signals of the standard meter to the ARM system is realized, and meanwhile, error verification is carried out.
The test method of the basic error test device of the electric energy meter considering the temperature and the current change comprises the following steps:
step 1, the power source outputs voltage and current waveforms of
In the formula of UnomIs the nominal value of the voltage, f, of the electrical energy meter under testnomIs a nominal value of frequency, ItestIn order to be the current signal amplitude,
initial phase angles of voltage and current signals are respectively;
step 2, setting the temperature test box at 23 ℃, and setting the phase angle difference of voltage and current to be 0 through the power source, namelyAmplitude of the current ItestIs 10Itr，ItrThe basic error v of the tested electric energy meter is obtained through the error calculating unit for the turning current of the electric energy meterBasic＝(EIs measured-EStandard of merit)/EStandard of merit×100％，EStandard of meritElectric energy value measured by a standard meter, EIs measuredRepresenting the electric energy value measured by the measured electric energy meter;
step 3, keeping the temperature test box at 23 ℃, and setting a current amplitude ItestIs kItrThe error calculating unit obtains the metering error v of the measured electric energy meter when the current changes1Thereby obtaining an error offset v of the current changeElectric current＝|ν1-νBasic|；
Step 4, keeping the current amplitude to be 10ItrSetting a temperature test box at 23 +/-X ℃, wherein X meets the requirement of 23 +/-X and is the temperature range of normal work of the electric energy meter, and obtaining an electric energy metering error v during temperature change by an error unit2Thereby obtaining an error offset v of the temperature changeTemperature of＝|ν2-νBasic|；
Step five, v obtained by the stepBasic，νElectric current，νTemperature ofThe error test result of the electric energy meter under the conditions of current change and temperature change is considered at the same time:
amplitude of the current kItrK is such that Imin≤kItr≤Imax，Imin，ImaxThe minimum and maximum currents of the electric energy meter in normal operation are shown.
The power source adopts a Fluke 6100A electric energy power standard source, the phase accuracy of 3 millidegree/year of 6100A ensures that the electric energy accuracy can realize the uncertainty of approaching 200ppm (0.02%), the fundamental frequency range can be output from 16Hz to 850Hz, the frequency accuracy can reach 50ppm, the sinusoidal voltage of 1000V and the sinusoidal current of 20A can be provided, and the power source is an adjustable power source with very high precision, so the power source is very suitable for the occasions requiring high-precision check and calibration, such as the test of various electric parameter meters of voltage, current, power and the like by the metering part .
Standard table: the RD-33 portable electric quantity standard meter of Radian corporation may be selected. RD-33 utilizes a new Dytronic measurement technique by Radian, including an A/D integration converter self-designed by Radian, which incorporates a voltage and current electronic compensation transformer and a sealed reference standard well known by Radian, making it the highest level in terms of accuracy, stability and functionality. The voltage input range is 30 to 630V, and the current input range can reach 120A or 200A per phase.
An error calculation unit: a32-bit ARM chip STM32F103VBT6 from ST corporation was used. The main frequency of the chip is 72MHz, the internal resource is rich, the chip is provided with 128k bytes FLASH and 20k bytes SRAM, and is provided with up to 9 communication interfaces and 7 timers, and each timer is provided with 4 channels for input capture/output comparison/PWM or pulse counting.
A temperature test chamber: a high-low temperature test box produced by Jiangsu Emerson test instrument science and technology limited is adopted. The temperature range can be selected from-40 ℃ to 150 ℃, the temperature deviation is less than or equal to +/-2 ℃, the temperature fluctuation degree is +/-0.5 ℃ in no-load, and the average temperature rise and fall speed is 0.7-1.0 ℃/min in no-load, so that the method can be used for examining the adaptability of the electric energy meter in high and low temperature environments.
The electric energy meter to be tested: class C electric energy meter produced by Ningbo medical instruments and instruments Limited and having nominal voltage value UnomIs 220V, the frequency nominal value fnomIs 50Hz, and has a breakover current ItrIs 0.1A.
The utility model discloses the concrete realization flow does:
the tested electric energy meter is arranged on a high-low temperature test box through a meter hanging frame, then an electric energy power standard source of Fluke 6100A generates alternating voltage and current sine wave to the tested electric energy meter and a standard meter RD-33, and an ARM chip calculates errors by comparing electric energy pulses of the tested electric energy meter and the standard meter RD-33.
The specific test is as follows:
1. basic error
Setting a temperature test box at 23 ℃, generating a voltage sinusoidal signal with the amplitude of 220V, the frequency of 50Hz and the phase angle of 0 degree and a current sinusoidal signal with the amplitude of 1A, the frequency of 50Hz and the phase angle of 0 degree by a Fluke 6100A electric energy power standard source, and obtaining and recording the basic error of the tested electric energy meter through an error calculation unit
νBasic＝νBasic＝(EIs measured－EStandard of merit)/EStandard of merit×100％＝(551.2－552.45)/552.45×100％＝-0.226％；
2. When the current changes
The temperature test chamber is kept at 23 ℃, the current amplitude is set to be 10A, and other conditions are kept unchanged. The error calculation unit obtains the metering error v of the measured electric energy meter when the current changes1-0.257%, thereby obtaining a current-modified error offset vElectric current＝|ν1－νBasic|＝|-0.257％－(-0.226％)|＝0.031％；
3. At the time of temperature change
Keeping the current amplitude at 1A, setting the temperature test chamber at 45 ℃, and obtaining the electric energy metering error v when the temperature changes by the error unit2-0.245%, to obtain an error offset of the temperature change:
νtemperature of＝|ν2－νBasic|＝|-0.245％－(-0.226％)|＝0.019％；
4. Test results
V obtained by the above stepsBasic，νElectric current，νTemperature ofThe error test result of the electric energy meter under the conditions of current change and temperature change is considered at the same time:
Claims (4)
- the device comprises a tested energy meter and a standard meter, and is characterized in that voltage and current output ends of a power source are respectively connected with the standard meter and the tested energy meter, electric energy pulses output by the tested energy meter and the standard meter are connected to an error calculation unit, the error calculation unit is connected with a master control center, and the master control center is connected with a PC.
- 2. The basic error testing device of electric energy meter considering temperature and current variation as claimed in claim 1, further comprising a temperature test chamber, wherein a meter hanging rack is fixed in the temperature test chamber, and the electric energy meter to be tested is hung on the meter hanging rack.
- 3. The basic error testing device of electric energy meter considering the temperature and current variation according to claim 1, wherein the error calculation unit is connected with the general control center through a CAN bus.
- 4. The basic error testing device of electric energy meter considering the temperature and current variation according to claim 1 or 3, wherein the error calculation unit is an ARM unit board.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031792A (en) * | 2019-05-17 | 2019-07-19 | 贵州电网有限责任公司 | Consider the Basic Error of Energy Meter test device and method of temperature and curent change |
| CN111562542A (en) * | 2020-05-31 | 2020-08-21 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter fault excitation test environment construction system and method |
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
-
2019
- 2019-05-17 CN CN201920715416.XU patent/CN210005677U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031792A (en) * | 2019-05-17 | 2019-07-19 | 贵州电网有限责任公司 | Consider the Basic Error of Energy Meter test device and method of temperature and curent change |
| CN111562542A (en) * | 2020-05-31 | 2020-08-21 | 宁夏隆基宁光仪表股份有限公司 | Electric energy meter fault excitation test environment construction system and method |
| CN113138362A (en) * | 2021-05-11 | 2021-07-20 | 深圳市先行电气技术有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter |
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