Data is continuously and periodically monitored, and
selected data is stored in a database of historical
measurements. Three categories of historical data is stored
in this database. The first category represents all system
data measured during the past twenty periodic monitoring
sessions. In addition, for each periodic monitoring session
in which a deteriorating component is detected, all
measured data corresponding to the deteriorating component
is stored in this database. The last category represents all
system data measured during each continuous monitoring
session in which an incipient failure is detected.
This historical data is used by the state estimator,
mathematical and ANN models, and faultlevent locator.