The Kalman filter as a way to estimate the life-model parameters ofinsulating materials and system

摘要

The Kalman filter algorithm is applied to linear life models,nvalid for insulating materials subjected to electrical and multiplenthermal-electrical stresses. Expressions for the state-space equations,nand then for the prediction and updating equations, are obtained on thenbasis of inverse-power and exponential models, thus providing a usefulntool for insulating-material characterization. In particular, thenextrapolation to stresses lower than the test stresses and thenestimation of the endurance coefficient become very sensitive to thentest results at the lowest stresses, thus providing evaluations whichncould be more representative of the service conditions than the normalnregression procedure. Examples are reported relevant to the results ofnlife tests performed on XLPE (cross-linked polyethylene) cable models