Broadband Technique Analysis for Insulation Fault Detection and Condition Monitoring in Rotating Electrical Machines

This paper provides a comprehensive discussion and review of cutting-edge techniques for insulation diagnosis and monitoring in rotating electrical machines, using broadband electrical excitation. These techniques cover a frequency range from a few kHz to the MHz band and are classified into three categories. Firstly, the paper explores the application of Frequency Response Analysis (FRA) to rotating machines. Secondly, techniques based on parasitic capacitance and Common-mode (CM) broadband impedance tracking are discussed. Finally, the paper examines methodologies related to high-frequency oscillations in the phase current following a switching event.