6
Fault Diagnosis of Electric Machines Using Techniques Based on Frequency Domain
Subhasis Nandi Ph.D.
University of Victoria
6.1 Introduction
Generally speaking, most of the fault detection techniques used in real¬time fault detection in power systems are time-domain based. The over current, over voltage, earth fault, impedance relays, and so forth are mostly time-domain based. However, as far as detecting faults for electric machines are concerned, frequency-domain-based techniques, especially ones based on fast Fourier transforms (FFT) are very popular. Except for stator-related faults, most other faults can be reliably diagnosed using a spectrum analyzer provided the machines are operating under steady-state conditions for at least ...
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