Transformer Magnetizing Inrush Current

Abstract

THERE ARE formulas available by which it is possible to calculate the peak of the first cycle of magnetizing inrush current for a transformer. There have been no convenient formulas available for determining the maximum values of successive cycles of current. The usual approach has been to use a step-by-step process of mechanical integration that is quite time-consuming and usually is not worth the effort. Below are presented approximate formulas for determining the maximum values of the successive cycles of current that will be satisfactory for the majority of cases where this information is desired.