Fault Diagnosis of Inter-turn Short Circuit Fault in Star-delta Winding Structure Based on Parameter Optimization VMD and Fuzzy Entropy

A star-delta connection winding structure can restrain the low order harmonic of armature magnetic field and improve the operating efficiency of machine. However, the risk of inter turn short circuit in its structure is higher. In this paper, the short-circuit current of inter-turn short circuit occurring at different winding positions is derived. An adaptive weight strategy is used to improve whale optimization algorithm (WOA). The improved WOA is adopted for optimizing the parameters of variational mode decomposition (VMD). VMD based on improved WOA for processing current signal is proposed. Finally, by calculating the fuzzy entropy of current and torque, a fault diagnosis method for inter-turn short circuit fault in star-delta connection winding structure is proposed. The accuracy of this fault diagnosis method can reach over 90%. And it can effectively distinguish that the inter-turn short circuit fault occurs in Y connection part or △ connection part.