11-10-2014, 09:24 AM
Abstracts: Protection of an induction motor (IM) against possible problems, such as single phasing ,over/under voltage ,over/under current , unbalanced voltage and unbalanced current , occurring in the course of its operation is very important . IMs can be protected using components such as timers, contactors, voltage, and current relays , involving mechanical dynamic parts .Computer and programmable integrated circuit (PIC) based protection methods have eliminated most of the mechanical components .Due to these electrical faults ,the winding of the motor get over heated which lead to insulation failure and thus reduce the life time of the motor.