Introduction
Conventional fixed-threshold alarming provides a reliable but inherently reactive layer of protection: it notifies operators only at the moment a developing problem crosses a hard limit and forces a shutdown, and it is structurally unable to recognise the multivariate relationships that typically precede a failure. To close this gap, an Early Warning System was engineered and deployed across the full fleet of 17 Solar Turbine engines — comprising Gas Turbine Compressors (GTC) and Gas Turbine Generators (GTG) — to identify abnormal behaviour while every individual process variable still reads within its normal operating envelope, and to forecast the remaining time available before an operating limit is reached.