Determining steady-state temperature excess and time constants using data of thermal tests of transformers

A method for calculating the steady-state temperature excess and thermal time constants of elements of power transformers using the so-called three-point formula proposed in [4] is generalized with allowance for the thermal nonuniformity of transformers and developed with allowances made for statistical data. The method uses data of thermal testing in the form of a time dependence of the temperature excess at a controlled point (heating curve). The possibility of applying a method for shortening thermal testing is shown.