Initial Magnetizing Current of a Transformer and Its New Numerical Analyzing Technique

Abstract

A new technique to numerically analyze transient phenomena of magnetic nonlinear circuit is presented in this paper. The technique is based on representing the magnetic nonlinear characteristics by relations between the coil currents and differential inductance, and applying the measured multiple characteristics separately by current range and by current history to the differential equations which describe the circuit operation.
This paper reports about the measured results of actual behaviors of transient magnetizing currents of no-load transformer which has initially demagnetized core, and also reports the numerical analyzed results of the transient phenomena computed by the technique.