The
project is designed to provide uninterrupted AC mains supply i.e., 230 volt to
a single phase load. This is achieved by automatic changeover of the load from
the missing phase to the next available phase in a 3 phase system.
It is
often noticed that power interruption in distribution system is about 70% for
single phase faults while other two phases are in normal condition. Thus, in
any commercial or domestic power supply system where 3 phase is available, it
is advisable to have an automatic changeover system for uninterrupted power to
critical loads in the event of missing phase.
In this
system auto selection is achieved by using a set of relays interconnected in
such a way that if one of the relay feeding to the load remains energized always.
Under the phase failure condition the corresponding step down transformer
secondary delivers zero voltage which is duly rectified to DC and then fed to
the logic gates comprising of AND & OR to switch on the next relay that
delivers the power to the load.
It also
has a provision of connecting to an inverter source which delivers
uninterrupted power to the load incase all the 3 phases go missing. The project
is supplied with three transformers connected to the 3 phases supply.
Further
the project can be enhanced by incorporating power semiconductor devices such
as thyristors/IGBTs for instantaneous changeover to the next available phase.
This overcomes the drawback of the changeover time generally witnessed by relay
switching operations.
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