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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