Inductance Characteristics of a Multi-Winding Transformer and its Equivalent Circuits
under Steady State and Magnetizing Inrush Conditions

Abstract

In this paper, the method of deriving the practical-use equivalent circuit of 3 winding transformer for calculating magnetizing inrush current of a transformer is shown. On the basis of this equivalent circuit, the simulation circuit for general-purpose programs, such as EMTP, can be derived. Reference is made also about the influence to a magnetizing inrush current calculation result by equivalent circuit constitution.