Abstract
In this paper a study on the use of insulation resistance of power transformer windings as a diagnostic factor for determining the lifetime line parameters of their insulation is presented. Accelerated thermal aging was carried out for plane winding models at 115, 5 and 155°C, for 1200 … 7000 h. For some values of the aging duration $\tau $, the reported values of the insulation resistance $R_{i(\tau)}$ were determined, and for two values of the end-of-life criterion $R_{i,eol}$, the lifetime lines corresponding to the Dakin and Montsinger aging models were drawn A new method for determining parameters a and b (by measuring three values of the windings insulation resistance) and calculating the consumed and remaining lifetimes is proposed.
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