000			01667nam a22001337a 4500
999			_c60380 _d60377
100			_aRiaz Hussain Memon _a10MPE16 _aSupervisor Prof. Dr. Muhammad Usman Keerio
100			_a10-MPE-16
245			_aThree Phase Induction Motor Protection Using Phase Failure Protector Scheme
260			_aNawabshah: _bQUEST, _c2016.
300			_a42p.
500			_aABSTRACT This research was aimed at to propose a protection scheme for three phase induction motors (IM) in case or phase failure fault. Protection of IM against different possible m ident fault would limit the fault duration and prevent motor under fault particularly for higher motor ratings. Power quality analyzer was employed for characteristic analysis of the functional motor. The results suggested that motor torque increased with corresponding increase in the speed of the motor. In overall terms, voltage imbalance in the range of 5% increased the operating temperature by 50%. The power factor values and displacement power factor were to one which showed the low quantity of harmonic waves. The harmonic distortion was 34.7% with the SCIM running at faulty position either at load position or no­ load condition resulting in the first order harmonic waves being developed. The Phase failure protection (PPP) circuit operated with the excess quantity of current through relay's mechanism, which saved the motor immediately via restarting it automatically with the timer setting in few seconds. The application of proposed PFP scheme proved successful in saving the motor under abnormal condition from the impending failed to it.
700			_aDepartment of Electrical Engineering
942			_cTHESIS