Energy metering IC provides high accuracy harmonic analysis for advanced power quality monitoring


Ronn Kliger,
Energy Group Director,
Analog Devices
Norwood, MA, U.S.A. — (METERING.COM) — September 20, 2011 – An energy metering IC (integrated circuit) offering real time harmonic analysis for energy meters and power quality monitoring equipment has been introduced by Analog Devices.

Designed for polyphase meters, the ADE7880 energy metering IC offers complete harmonic analysis, including magnitude and phase information, and delivers better than 1 percent accuracy over a dynamic range of 2000:1 up to the 63rd harmonic. The new device is the first to use ADI’s proprietary ARTM (adaptive real time monitoring) harmonic analysis technology, which eliminates the need for custom development of sophisticated digital signal processing and reduces the demands on the system microcontroller.
“Harmonic pollution is growing as grid connected loads and sources increasingly rely on power electronics that generate or consume harmonic power,” said Ronn Kliger, Energy Group director, Analog Devices. “The ADE7880 enables smart grid systems to accurately monitor harmonic pollution so that corrective action, when necessary, can be taken by utilities and their customers.”

Key features of the ADE7880 include:

  • ARTM automatically tracks changes in the fundamental frequency, which eliminates any effects of frequency drift on accuracy of the measurements
  • For each harmonic, computes the voltage and current rms, power factor, and active, reactive and apparent powers
  • Computes THD+N (total harmonic distortion plus noise) ratio as well as harmonic distortion as a ratio of the fundamental
  • Delivers active and reactive energy accuracy better than 0.2 percent over a dynamic range of 5000:1, and accuracy better than 0.1% over a dynamic range of 1000:1 with gain calibration only
  • Incorporates seven sigma-delta ADCs, a digital integrator, voltage reference and all metrology signal processing. Suitable for class 0.2 meters.