Detection of an Incipient Rotor Winding Inter-Turn Short Circuit Fault

This paper proposes a new strategy to enhance the diagnosis accuracy of the rotor fault in the Wound Rotor Induction Machine (WRIM) which function under variable load conditions, like wind turbines system. An incipient isolation fault between two adjacent turns of the rotor winding of one phase afterward provokes a great number of Inter-turn short-circuits (ITSCs) due to the vibration produced by this unbalance between the three rotor phases. For this purpose, an early diagnosis of any incipient ITSC at different loads is prominent to get rid of subsequent degradation and minimize the maintenance costs. The monitoring condition (CM) system, based on the association of the Hilbert Transform (HT), Time-Synchronous-Averaging (TSA), and Motor Current Signature Analysis (MCSA), is elaborated. The proposed methodology has been built and verified using Matlab/Simulink. The obtained outcomes indicate that the developed technique can extract a small percentage of shorted turns in the rotor winding of the wound rotor machine even under low or no-load.