CN212646969U - Calibration device for dynamic response time characteristic of electric energy meter - Google Patents
Calibration device for dynamic response time characteristic of electric energy meter Download PDFInfo
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- CN212646969U CN212646969U CN201922380761.5U CN201922380761U CN212646969U CN 212646969 U CN212646969 U CN 212646969U CN 201922380761 U CN201922380761 U CN 201922380761U CN 212646969 U CN212646969 U CN 212646969U
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Abstract
A device for checking the dynamic response time characteristic of an electric energy meter comprises a master controller, a dynamic signal generator, a signal conditioning circuit, a standard meter, an error display unit and an error calculation unit. The master controller controls the dynamic signal generator to generate a required dynamic test signal; the signal conditioning circuit outputs the dynamic test signal sent by the dynamic signal generator to the standard table and the detected table through the conditioning circuit; the standard table and the detected table respectively output respective dynamic response pulses to an error calculation unit for dynamic response error calculation; and displaying the error value through an error display unit. The utility model relates to an electric energy meter dynamic behavior calibration equipment can produce dynamic test signal, and the dynamic test signal that the device produced mainly is formed by power frequency signal through sinusoidal amplitude modulation, frequency modulation and phase modulation. The utility model discloses the inside standard table that uses of calibration equipment has good dynamic property.
Description
Technical Field
The utility model relates to a calibration equipment of electric energy meter dynamic response time characteristic belongs to electric energy meter measurement technical field.
Background
The electric energy meter is an important metering instrument for electric energy trade settlement, and the metering accuracy and the operation reliability of the electric energy meter directly influence the economic benefits of both electric energy supply parties. With the development of power electronic technology and the increase of nonlinear loads, a large amount of dynamic electric energy signals exist in a power grid. In order to ensure that the electric energy meter can accurately measure the dynamic electric energy signal, the dynamic performance of the electric energy meter needs to be detected.
Although the existing electric energy meter dynamic performance detection method has requirements on basic errors of the electric energy meter under dynamic signals, the time for detecting the dynamic basic errors of the electric energy meter is not specified. If the electric energy meter needs to meet the requirement of a dynamic basic error under a long detection time, the electric energy meter still does not meet the actual use requirement. Because the dynamic signal is rapidly changed under the actual operation condition, the dynamic signal cannot be kept unchanged for a long time; the dynamic electric energy metered by the electric energy meter in a short time possibly has larger error; in addition, the detection efficiency is affected by overlong detection time, and the popularization and application of the dynamic electric energy meter are not facilitated.
Disclosure of Invention
The utility model aims at overcoming prior art not enough, further improving the accuracy of electric energy meter to dynamic electric energy measurement, promoting the promotion of the dynamic measurement performance of electric energy meter, making it satisfy the practical application demand, providing a calibration equipment of electric energy meter dynamic response time characteristic.
The utility model adopts the following technical scheme that the device for checking the dynamic response time characteristic of the electric energy meter is used for checking the dynamic response time characteristic of the electric energy meter; when the dynamic error of the electric energy meter is checked, the checking device gives out the dynamic metering error of the electric energy meter within the specified response time; checking for multiple times to obtain a group of error data, and calculating the standard deviation of multiple measurement results; and comparing the error and the standard deviation thereof measured by multiple times of verification with the limit value specified in the technical standard of the electric energy meter, and indicating that the dynamic response time characteristic of the electric energy meter is qualified only if the error and the standard deviation thereof simultaneously meet the requirements.
The utility model relates to a calibration device for the dynamic response time characteristic of an electric energy meter, which comprises a master controller, a dynamic signal generator, a signal conditioning circuit, a standard meter, an error display unit and an error calculation unit; the output end of the dynamic signal generator is connected with the input end of the signal conditioning circuit; the output end of the signal conditioning circuit is respectively connected with the input ends of the standard table and the detected table; the output ends of the standard table and the detected table are respectively connected with the corresponding input ports of the error calculation unit; the output end of the error calculation unit is connected with the error display unit; and the master controller is connected with and controls the dynamic signal generator.
The signal conditioning circuit outputs the dynamic test signal sent by the dynamic signal generator to the standard table and the detected table through the conditioning circuit; the standard table and the detected table respectively output respective dynamic response pulses to an error calculation unit for dynamic response error calculation; and displaying the error value through an error display unit.
And the master controller controls the dynamic signal generator to generate a required dynamic test signal.
The utility model has the following working principle, and is different from the common electric energy meter calibration device in that the electric energy meter dynamic performance calibration device can generate dynamic test signals, and the dynamic test signals generated by the device are mainly formed by power frequency signals through sine amplitude modulation, frequency modulation and phase modulation; and the utility model discloses the inside standard table that uses of calibration equipment has good dynamic property.
The utility model has the advantages that the calibration device can give out dynamic metering error of the electric energy meter within the specified response time; multiple times of verification can be carried out, a group of error data is obtained, and standard deviation of multiple measurement results is calculated; and comparing the error and the standard deviation thereof measured by the multiple times of verification with the limit value specified in the technical standard of the electric energy meter, and verifying whether the dynamic response time characteristic of the electric energy meter is qualified or not.
Drawings
Fig. 1 is a structural schematic block diagram of the checking device for checking the dynamic response time characteristic of the electric energy meter.
Detailed Description
The specific embodiment of the present invention is shown in fig. 1.
The device for verifying the dynamic response time characteristic of the electric energy meter comprises a master controller, a dynamic signal generator, a signal conditioning circuit, a standard meter, an error display unit and an error calculation unit, wherein the master controller is used for controlling the dynamic signal generator to generate a dynamic signal; the output end of the dynamic signal generator is connected with the input end of the signal conditioning circuit; the output end of the signal conditioning circuit is respectively connected with the input ends of the standard table and the detected table; the output ends of the standard table and the detected table are respectively connected with the corresponding input ports of the error calculation unit; the output end of the error calculation unit is connected with the error calculation unit; and the master controller is connected with and controls the dynamic signal generator.
The method for testing the dynamic response time characteristic of the electric energy meter is verified according to the verifying device of the embodiment.
In this example, the accuracy grade of the tested meter is known to be 0.5 grade, the basic error limit is 0.5 percent, the standard deviation limit is 0.1 percent, and the meterThe constant is 1200 imp/kWh; the accuracy grade of the checking device is 0.1 grade, and the meter constant of an internal standard table of the checking device is 2 multiplied by 106imp/kWh; the test sheet was measured 8 times in duplicate. The specific test steps are as follows:
step 1: selecting an electric energy meter with the accuracy grade of 0.5 grade as a tested meter;
step 2: selecting a standard device with the accuracy grade of 0.1 grade under a dynamic test signal as a checking device;
and step 3: the limit value of the basic error of the tested table is 0.5%, and the limit value of the standard deviation of 8 measurement results is 0.1%;
and 4, step 4: calculating the dynamic response time (the number of check pulses is expressed as 2) of the electric energy meter according to the meter constant of the standard meter, the dynamic basic error limit of the tested meter and the meter constant of the tested meter;
and 5: using a checking device to check the dynamic error of the checked table, and setting the number of checking pulses to be 2; when the checking device receives 2 pulses sent by the detected table, the basic error value of the detected table is given, and the error value gamma at the moment is recorded.
Step 6: carrying out error checking for 8 times according to the conditions in the step (5) to obtain a group of error values gammai(i takes 1,2,3, …, 8); according to the measured error value, calculating to obtain the standard deviation S1。
And 7: determine | γiLess than or equal to 0.5 percent and S1Whether the content is less than or equal to 0.1 percent or not is true simultaneously; if the two conditions are met, the dynamic response time characteristic of the detected electric energy meter is qualified; if the dynamic response time characteristic of the table to be detected is not qualified, improvement is needed.
In step (2), the requirements of the checking device with an accuracy level of 0.1 are: the checking device can continuously generate dynamic test signals, the accuracy grade of a standard meter in the checking device is not lower than 0.03 grade, and the electric energy under the dynamic signals can be accurately measured.
In step (4), the application requirement of the dynamic response time calculation formula is: the instrument constant of the known standard meter, the instrument constant of the known checked meter and the basic error limit; it should be noted that the dynamic response time is indirectly represented by the number of the verification pulses, and when the load current is not changed, the number of the verification pulses reflects the length of the verification time. The dynamic response time can be indirectly represented by the number N of the check pulses, and the mathematical expression is as follows:
in the formula:
C0-checking the (pulse) meter constants, imp/kWh, of the standard meter in the device;
CLthe (pulse) meter constant of the meter under test, imp/kWh;
Eb-basic error limits of the table under test;
round () -floor function.
Substituting numerical values, then there are:
in step (5), the requirements for performing dynamic error check on the table to be checked by the checking device are as follows: the calibration device generates continuous dynamic test signals, and a standard meter and a tested meter in the calibration device perform electric energy metering on the same dynamic test signal; the pulse output of the checked table is connected to an error calculation unit of the checking device; the number of the check pulses is set to be 2 on the checking device, and when the device receives 2 pulses sent by the checked meter, an error numerical value is displayed.
Wherein, the step (6) is to repeat the measurement for 8 times under the condition of the step (5) to obtain 8 error values, and finally calculate the standard deviation S according to a group of error data measured1。
And (7) judging whether the dynamic response time characteristic of the tested table meets the requirement or not according to the data obtained by the test. And when the errors and the standard deviations measured in the dynamic response time meet the requirements of corresponding accuracy levels, judging that the dynamic response time characteristics of the electric energy meter are qualified.
Claims (4)
1. A calibration device for the dynamic response time characteristic of an electric energy meter is characterized by comprising a master controller, a dynamic signal generator, a signal conditioning circuit, a standard meter, an error display unit and an error calculation unit; the output end of the dynamic signal generator is connected with the input end of the signal conditioning circuit; the output end of the signal conditioning circuit is respectively connected with the input ends of the standard table and the detected table; the output ends of the standard table and the detected table are respectively connected with the corresponding input ports of the error calculation unit; the output end of the error calculation unit is connected with the error display unit; and the master controller is connected with and controls the dynamic signal generator.
2. The device for verifying the dynamic response time characteristic of the electric energy meter according to claim 1, wherein the signal conditioning circuit outputs a dynamic test signal sent by the dynamic signal generator to the standard meter and the to-be-detected meter through the conditioning circuit; the standard table and the detected table respectively output respective dynamic response pulses to an error calculation unit for dynamic response error calculation; and displaying the error value through an error display unit.
3. The device for checking the dynamic response time characteristic of the electric energy meter according to claim 1, wherein the master controller controls the dynamic signal generator to generate the required dynamic test signal.
4. The apparatus of claim 3, wherein the dynamic test signal is formed by subjecting the power frequency signal to sinusoidal amplitude modulation, frequency modulation, and phase modulation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190134A (en) * | 2019-12-26 | 2020-05-22 | 国网江西省电力有限公司电力科学研究院 | Electric energy meter dynamic response time characteristic test method and calibration device |
| WO2023173658A1 (en) * | 2022-03-15 | 2023-09-21 | 国网江西省电力有限公司供电服务管理中心 | Dynamic-error measurement apparatus, system and method for electric energy meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111190134A (en) * | 2019-12-26 | 2020-05-22 | 国网江西省电力有限公司电力科学研究院 | Electric energy meter dynamic response time characteristic test method and calibration device |
| CN111190134B (en) * | 2019-12-26 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Dynamic response time characteristic test method and verification device for electric energy meter |
| WO2023173658A1 (en) * | 2022-03-15 | 2023-09-21 | 国网江西省电力有限公司供电服务管理中心 | Dynamic-error measurement apparatus, system and method for electric energy meter |
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