Development of a Hybrid Automatic Power Changeover Switch with Phase Selector.

This paper presents the design and construction of a Hybrid Automatic Power Changeover Switch with Phase Selector. The system is capable of switching between three different sources of power supply, viz: public power supply, generator and inverter circuit system. This design and implementation were achieved with the use of contactors/relays to effect the switching and at mega 328 microcontroller that is programed to compare the voltage levels of the three-phase supply. The work was simulated using an Electrical Control Technique Simulator (EKTS), while the phase selector was simulated in Proteus environment to ensure it workability. The work was tested, and results shows that it automatically switches power supply from generator to public supply and put off the generator once there is public power supply, it also automatically switches to an inverter or any alternative means of power supply other than generator once there is public power supply outage; this ensures the reliability of power supply to our loads (equipment). [ABSTRACT FROM AUTHOR]