Design of Standard Electricity Metering Device Based on Low Current Condition

In order to realize the research of power traceability under low current condition, a three-phase dynamic waveform standard source is designed based on the technical scheme of digital waveform fitting and voltage current power amplifier module. By using the current power amplifier module of the self-designed AC/DC double loop negative feedback circuit, the device can not only realize the output of any waveform, but also realize the accurate and stable output of small current as low as 0.3mA. The output waveform distortion is less than 0.1%, the accuracy is better than 0.1%, and the stability is better than 0.2%.