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A Proposed Technique for Discrimination between Saturation Phenomenon and Short-Circuit Faults in Induction Motor

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This paper proposes a new technique of discrimination between the two signatures related to the magnetic saturation phenomenon (MSP) and the inter-turn short-circuit (ITSC) fault in a three-phase induction motor (IM). This technique is based on the exploitation of the amplitude and the phase angle of a new harmonic characterizing both phenomenons obtained from the characteristics of the Hilbert transform. In addition, and in order to simplify the interpretation and analysis of the various modes of operation covered in this paper, a new graphical tool based on a triangular representation is proposed. This graphical representation depending on the position and the orientation of the triangle makes it possible to display in a simple and clear manner the existence of the ITSC fault and its discrimination with respect to the MSP phenomenon. To assess the performance of this new technique, some simulation works are performed on signals obtained from a mathematical model of the IM based on the calculation of the inductances by the modified winding function approach (MWFA).
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Induction Motor; Diagnosis; Saturation; Short-Circuit Fault; Modified Winding Function; Hilbert Transform; Spectral Analysis; Phase-Angle

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