Design and implementation of low cost three phase energy meter

A three phase digital energy meter developed using Digital Signal Processor (DSP), for measurement of energy consumed by three phase load, ensures energy conservation and maintains high accuracy. This paper presents a simple and cost effective design of three phase digital energy meter, without compromising the power measurement quality. It uses a voltage and current signal conditioning circuit and antialising filter, to sense system voltage and current. The power measurement is done by multiplication of instantaneous samples/values of current i(t) and voltage v(t) without need of a separate power factor measurement circuit. For power measurement, definitions in IEEE standard considered. The analog circuit with antialiasing filter is tested and DSP interface is developed, in a laboratory setup.