English

Abstract

Electricity is lifeline of any country and its continuous availability at minimum cost ensure the country’s growth. Reducing the burden over the energy resources leads to the use of alternative sources of energy like Solar, Wind etc. also they are available free of cost. So modern industries and homes, to ensure regular power supply incorporates mainly three sources of energy i.e. Solar, Mains(Utility grid), Diesel generator sets. So an automatic phase selector circuit is required for the switching between these supplies with the Solar having the highest priority followed by Mains for having access of cheapest electricity. The circuit make use of Transformer, Rectifier, Regulator, Comparator and Relays. The switching time is reduced considerably due to the use of high speed electronics devices.