A single phase microcontroller based energy meter

This paper presents a single phase electrical energy meter based on a microcontroller from Microchip Technology Inc. PIC family. This electronic meter does not possess any rotating parts, and the energy consumption can be easily read from a four-digit display. Besides that, energy consumption is stored in the microcontroller´s EPROM memory. This action is necessary to ensure a correct measurement even in the event of an electrical outage or brown out. As soon as the supply is restored, the meter restarts with the stored value. As this meter is compatible with the electromechanical ones, no additional costs will be incurred by the utility companies in their replacement. A single-phase energy meter prototype has been implemented in the lab to provide measurement up 10 A load current from a 127 V line voltage. The observed accuracy was better than 97%