Digital electric energy meter checking device based on analog source tracing method

Abstract

The invention discloses a digital electric energy meter checking device based on an analog source tracing method, which is used for the accuracy testing of an electric energy meter based on an IEC61850 standard. The device comprises an AC signal conditioning board, a central control board, an industrial personal computer and a liner power panel which provides power to the device, wherein the AC signal conditioning board carries out front-end low-distortion conversion to three-phase voltage and three-phase current provided by a circumscribed standard power source, and the three-phase voltage and the three-phase current are converted into a voltage signal ranged by the AD analog to digital converter of the rear central control board; the central control board finishes the functions of AC signal sampling, electricity energy accumulation, IEC61850 standard communication, error calculation and data exchange with the industrial personal computer; the industrial personal computer is used for developing a human-computer interface, finishing the functions of giving an order, communicating data and displaying a result and exchanging the order and the data with the central control board via a serial port. The self precision of the checking device reaches 0.05 level, and the magnitude can be upwards traced to the source to higher level of the existing national standard.

Description

technical field [0001] The invention relates to an electric energy meter verification device, in particular to a digital electric energy meter verification device based on an analog traceability method, which is used for error testing of electric energy meters based on the IEC61850 standard applied in digital substations. Background technique [0002] As electric energy metering equipment, digital energy meters based on the IEC61850 standard have not been used in substations or power plants on a large scale. The very important reason is the lack of effective means for error testing of digital energy meters. The so-called effective means must meet two conditions: One is that the calibration device can output data conforming to the IEC61850 standard to the tested electric energy meter, and receive the electric energy pulse of the tested electric energy meter to measure the error of the tested electric energy meter; the other is that the accuracy level of the calibration device ...

AI Technical Summary

Problems solved by technology

The main problem of this technology is that the accuracy of the signal generator’s reference itself cannot be measured by the national standard, that is to say, the accuracy of the calibration device can only be guaranteed by the designer, and cannot be verified by third-party means

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