Low cost electricity meter reading system using GSM

The proposed system focusses on development of low power and low cost electric energy meter reader. The system consists of two modules, measurement and communication module. The measurement module measures the line current and voltage in order to measure wattage and finally energy. Current transformer (CT) senses the line current while the potential transformer (PT) measures the line voltage. The outputs, obtained from CT and PT, are current to voltage converted, rectified, filtered, attenuated and analog to digital converted. The energy is summation of the power used over a known period of time. The amount of energy is transmitted to Power supplier as well as consumer via SMS (Short Messaging Service) at predefined intervals. The system also notifies Power Company in event of meter tampering.