Patent ID: 9091732
Filing Date: 2015-07-28
Classification: G01R

Abstract:
1. A method for monitoring shaft signals associated with a shaft of a rotating machine, the method comprising: receiving a plurality of voltage signals associated with the shaft; receiving a plurality of current signals associated with the shaft; providing a processor arranged for: calculating and trending a root mean square (RMS) and average shaft voltage; calculating and trending harmonic content of the shaft voltage; if harmonic content is high then identifying a potential fault; grouping voltage harmonics together and storing them with previously stored harmonics to further identify faults; receiving a synchronization signal to allow the received current signal to be synchronized with an energizing waveform; for relatively low frequency components of the received current and voltage signal, calculating and trending RMS current and DC average current and voltage; for the relatively low frequency current components, calculating and trending peak current and average current; for the relatively high frequency current components, creating a scatterplot, wherein the scatterplot represents phase resolved peak values of signals that are present on the shaft; storing the scatterplot in a database; compare the scatterplot with previously stored scatterplots to identify potential faults; if a fault condition exists then notifying a user that a fault condition exists; capturing electromagnetic interference (EMI) data; compare the EMI data with previously stored EMI data to identify potential faults; and if a fault condition exists then notifying a user that a fault condition exists; and displaying the EMI data or the scatterplot to a user via a user interface.