The
project is designed to protect an induction motor from single phasing and over
temperature. Providing a protection system is very important in industries,
using lot of motors such that production is not hampered owing to failure of
any motor.
The
basic idea for the development of this project is to provide safety to the
industrial motor/pump/lift Motor etc. If any of the phases, out of the 3 phases
is missing or if the temperature of the motor during operation exceeds the
threshold value, motor stops immediately.
The
system uses a 3-Phase power supply where three single phase transformers are
connected to it. If any of the phases is not available the corresponding
transformer stops supplying power to the circuit. This leads to one of the four
relays getting switched OFF.
The
main relay which is powered through a set of four relays gets disconnected
because of one relay not being powered. Thus the main relay that delivers 3
phase supply to the motor gets disconnected. A thermistor is connected to the
motor body to sense the temperature. If the temperature increases then supply
to the fourth relay is disconnected.
Further
the project can be enhanced by using current sensors for over load protection
and phase sequence sensor for protecting the motor from applying wrong phase
sequence.
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