To provide a method and
system for improving the reliability of a
utility system asset.SOLUTION: The method includes receiving a
time series signal collected from a sensor in a
utility system asset, using an
inference model to generate an estimated value of the
time series signal, performing a pairwise difference operation between the actual value and the estimated value of the
time series signal to generate a residual, and performing a
sequential probability ratio test (SPRT) on the residuals to generate an SPRT alarm, applying an irrelevance filter that removes SPRT alarm for a signal that does not correlate with previous failures of similar
utility system assets to the SPRT alarm to generate a filtered SPRT alarm, using a
logistic regression model to calculate an RUL-based
risk indicator for the utility
system asset on the basis of the filtered SPRT alarm, and generating a notification indicating that the utility
system asset needs to be replaced when the
risk indicator exceeds a threshold value.SELECTED DRAWING: Figure 2