Auto Switching of any Available Phase in a Three Phase Supply System

This paper presents the analysis of the concepts and algorithms of Auto Switching of any Available Phase in a Three Phase Supply System. Power failure is a common problem. It happens generally. It is often noticed that power interruption in distribution system is about 70% for single phase fault while the other two phases are in normal condition. So we can take power by other phases by manual switching of the system to other phase. But it is time consuming as certain time is required to switch onto the other phase i.e. power is interrupted for certain time. Thus this system is useful in any commercial or domestic power supply system where three phases are available and automatic phase switching system is required for uninterrupted power to critical loads in the event of power failure in any phase. The main aim of this paper is to present the real idea of an automatic phase switch for 220V alternating current. Although, there are many designs that can perform almost similar functions. But this model is about an automatic phase changeover which is designed for only three phase AC input power to single phase output application. The benefit of this work is that the time required for switching between the phases have been drastically reduced, more automatic operation with the elimination of selector switch and the problem of sparking between the selector switch and the phase connection does not arise.