Detection of Stator Interturn Fault in Double Star Induction Motors

In the present paper, the electromagnetic properties of a Double Star Induction Machine (DSIM) are investigated experimentally by considering a short circuit in the stator winding. The DSIM consists of two three-phase windings, which are spatially phase-shifted by 30 electrical degrees. Usually, the study of the short circuit fault in an induction machine is done by monitoring the stator current harmonics. In contrast, the present work focuses on the experimental analysis of flux density. The measurements are performed by applying a short circuit to a single phase winding. Two flux sensors, which are located in the stator external periphery, are used to measure flux density. In addition to the experimental tests, a theoretical study has been carried out to predict the behavior of both flux density and stator currents.