Protection Method against Induction Motor Single-Phasing Fault
Cosmas U. Ogbuka1, Ogbonnaya Bassey2

1Engr. Cosmas U. Ogbuka, Department of Electrical Engineering, University of Nigeria, Nsukka Nigeria.
2Ogbonnaya Bassey, Department of Electrical Engineering, University of Nigeria, Nsukka Nigeria.
Manuscript received on 12 November 2014 | Revised Manuscript received on 22 November 2014 | Manuscript Published on 30 November 2014 | PP: 61-65 | Volume-4 Issue-6, November 2014 | Retrieval Number: E1835104514/14©BEIESP
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Abstract: This paper proposes a protection scheme for three phase induction motors against single-phasing faults. Dynamic model of the induction motor in the stationary reference frame was adopted and modified to reflect single-phasing fault. A simulation algorithm was proposed, which can help determine the impact of single-phasing on any three phase induction motor. A case study simulation was carried-out with sudden single-phasing using MATLAB/SIMULINK software. A single-phasing protection by means of contactors was reviewed before an enhanced single-phasing protection was designed. A prototype of the enhanced protection method was implemented by the use of ac to dc converter, PIC16F877A and DC relays. The latter, in additional to offering protection against single-phasing, also protects the motor from under-voltage, over-voltage and voltage unbalance.
Keywords: Single-Phasing, Three-Phase Induction Motor, PIC16F877A, ADC, Contactor.

Scope of the Article: Probabilistic Models and Methods