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This power line meter was developed from scratch for a start-up company and represents a concept to product design. The purpose of this product was to provide a low-cost remote power monitoring device that could be used in apartments and marinas. The basic requirement was to measure 120 volt power at current levels exceeding 100 amperes. Two phases needed to be measured and read out simultaneously to a remote data collection center by a simple two-wire communication scheme. True RMS power was to be measured regardless of current waveshapes. The signal processing was employed following a multiplexed A/D converter and implemented in a self-contained microprocessor. The design had to be tolerant of very high line voltages such as those due to typical power line faults, and robust enough to survive high-voltage surges commonly associated with nearby lightning strikes. The design flexibility allowed for three-phase power monitoring at nominal voltages up to 440 volts.
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