Judgment method for measurement error stability of single-phase smart energy meter on site

Abstract

The present invention is a method capable of judging the measurement error stability of a single-phase smart electric energy meter at the installation site. In the EEPROM of the electric energy meter, the factory error data curve of the meter is formed, and then the whole second judgment is inserted in the main loop of the single-phase smart electric energy meter software, the display button is pressed for > 5 seconds, the display error symbol = 1, and the error display symbol is 1 Judgment, read the current real-time power of the metering chip, according to the current real-time power, average the error data of two adjacent test points before and after to display the ideal error data, the error display timing is greater than 240 seconds to judge, display error sign = 0, return to normal main loop. It can not only meet the requirements of measurement accuracy, but also save operating costs, save labor and time, and has the advantages of being simple and applicable, fast and accurate.

Description

Technical field [0001] The present invention belongs to the field of smart grid energy metering technology, is a method capable of determining the stability of the measurement error of a single-phase smart energy meter at the installation site. Background [0002] Single-phase smart energy meter is currently the most used, the most widely used, on-site metering of electricity appliances, in order to ensure its measurement accuracy, single-phase smart energy meter needs to be "limited use and expiration rotation". Usually, the verification period for electronic energy meters of Level 1 and Level 2 does not exceed 8 years. This means that the single-phase smart energy meter can be used for up to 8 years, and a new meter must be replaced for more than 8 years. And these single-phase smart energy meters that have been used for 8 years, there are still many metering performances that are still very stable and reliable, and it is a great waste to replace them in 8 years. In 2018, based...

AI Technical Summary

Problems solved by technology

However, using the on-site calibrator directly to test the operating error of the single-phase smart energy meter in real time on the spot has the following problems: the current accuracy level of the single-phase smart energy meter is level 2, which means that the percentage error range changes from -2 to +2 , this will appear: the factory percentage error of the tested electric energy meter is +0.87. After 8 years of operation, the percentage error of the field calibrator test is -1.78. According to the test error of the field calibrator, the tested single-phase The result of the smart energy meter is qualified, but combined with the factory error of the meter, it is certain that the metering performance of this meter has become unstable.

The entire sampling and re-qualification process is labor-intensive and costly

So far, there have been no reports and practical applications on the method of reliably analyzing whether the metering performance of a single-phase smart energy meter is stable by using an on-site calibrator to test the error without dismantling the meter.

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