Induction machine analysis with extensive stator interturn fault conditions

Abstract

This work investigates stator interturn short-circuit faults in induction machines. The goal is to examine possible fault signatures used in detection methods for interturn short-circuit faults. For this purpose, a faulted induction machine is analysed through a finite-element model. Great attention is given to the sequence components and harmonic content of the stator currents. Finite-element-based results are provided and discussed for an extensive set of fault conditions. The stator-current negative sequence and the rotor slot harmonics are dependent on the fault presence. An induction machine prototype with tapped windings is used for experimental tests where an extensive amount of fault conditions is implemented. The experimental tests validate the finite-element model and the fault signatures.