Palestine Technical University Research Journal


A three-phase induction motor will continue to operate when a disturbance of some sort causesthe source voltages of the motor to become unbalanced. When an induction motor is operated at unbalanced voltage supply the performance characteristics like efficiency, power factor, input power, output power and losses are affected. The single-phasing occurs when one phase fails as a result of a fuse blowing, protective device opening on one phase of the motor, open phase on one terminal of the motor or other causes.This paper will analyze the operation of a 3-phase induction motor under normal balancedsource voltages first, then under single phasing experimentally in order to follow a comparative approach.