Modeling and faults detection of small power wound rotor induction machine

In this work, we focus specifically in winding faults that may occur to the small power wound rotor induction machine. Inter-turn short-circuit faults are often critical and must be detected earlier with a good precision in order to inform a supervisor of the existence of a system failure to limit the risks incurred by the material and human located around the machine in fault. Using winding function approach for modeling the machine, two models of inter-turn short-circuit are selected: the first model isolates the turns short-circuited to form a new coil and the faulty coil has a new number of turns minus the number of turns short-circuited. In this faulty coil appears a current called circulating current. The second model has a same aspect of the first model but in this time, the point of contact of the inter-turn short-circuited is modelised by a resistance. In order to ensure the performance of the used methods, a validation using another model, electric circuits magnetically coupled followed by experimental validation is effectuated. The obtained results validate the proposed techniques and demonstrate the effectiveness of the developed approach.