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A high-accuracy, three-phase electronic watthour meter, implemented in a 3.5- mu m double-poly CMOS technology, is described. It receives inputs from voltage and current sensors, measures both real and reactive power, and outputs pulses whose rate is proportional to energy flow. The meter is accurate to 0.3% of reading over 3.5 decades. A block diagram is presented, and the device functions are described...
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