The increased application of higher frequency nonlinear loads, such as electronic fluorescent ballasts and higher speed adjustable drives, has resulted in the need to monitor the higher power system harmonics which were largely ignored in earlier power monitors. Addressing this need requires a meter with substantially higher sample rate and greater computational power. This paper describes a zero-blind, three-phase, three-element power meter that samples three voltages and four currents at 256 points per cycle. The instrument relies on the FFT to compute real and reactive power at each harmonic and reports total real, reactive, and distortion power on each phase. The innovative design is based on a multiprocessor chip which incorporates a DSP for acquisition and point metering, a CISC processor for floating point summary data, and a RISC processor for interface to support communications with the host PC. The paper concludes with a system evaluation on highly distorted industrial power system waveforms.

Meeting Name

17th IEEE Instrumentation and Measurement Technology Conference, 2000. IMTC 2000


Electrical and Computer Engineering

Keywords and Phrases

CISC Processor; DSP; FFT; RISC Processor; Analogue-Digital Conversion; Computerised Monitoring; Digital Signal Processing Chips; Distorted Industrial Power System Waveforms; Distortion Power; Electric Current Measurement; Electronic Fluorescent Ballasts; Fast Fourier Transforms; Floating Point Summary Data; Higher Frequency Nonlinear Loads; Higher Speed Adjustable Drives; Microcontroller; Microcontrollers; Multiprocessor Chip; Power Engineering Computing; Power Meters; Power System Harmonics; Power System Measurement; Reactive Power; Real Power; Reduced Instruction Set Computing; Three Phase Power Metering System; Three-Element Power Meter; Voltage Measurement; Wave Analysers; Zero-Blind

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2000 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2000