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Estimating remaining BDV and life expectancy for stator winding insulation of rotating machines by using nondestructive insulation diagnostic data

We have investigated an appropriate life expectancy estimating method of the epoxy resin-rich insulation system (Fuji F-class Stabilastic insulation system). We have already collected the BVD and the nondestructive insulation diagnostic data from 30 or more units of the rotating electric machines provided epoxy resin-rich insulation system with the rated voltage of 3.3 to 11 kV. We have performed a multivariate analysis on the BVD and the nondestructive insulation diagnostic data of these coils in this time, and have established the estimating method for the remaining BVD and the life expectancy. On the basis of compared results of the measured values with the estimated values, it was proven that this estimating method provides enough accuracy for the actual use.