Polyphase energy-metering IC monitors harmonic frequencies

摘要

Analog Devices' new three-phase ADE7880 energy-metering IC for polyphase meters employs the com pany's harmonic-analysis technology for advanced power-quality monitoring. The ADE7880's harmonic analysis produces magnitude and phase information, includ- ing current rms (root/mean/square); voltage rms; active, reactive, and apparent powers; and power-factor, harmonic-distortion, and THD+N (total-harmonic-distortion-plus- noise) calculations. The ADE7880 delivers better than 1 % accuracy over a dynamic range of 2000 to 1 to the 63rd harmonic. It delivers active- and reactive-energy accuracy better than 0.2% over a dynamic range of 5000 to 1 and accuracy better than 0.1% over a dynamic range of 1000 to 1 with gain calibration only. Using the company's proprietary ARTM (adaptive-realtime-monitoring) harmonic-analysis technology, the ADE7880 eliminates the need for custom development of sophisticated digital-signal processing and reduces the demands on the system microcontroller.