Table of Contents
Advances in Power Electronics
Volume 2012, Article ID 635715, 6 pages
Research Article

Improved Expression for Estimation of Leakage Inductance in E Core Transformer Using Energy Method

1Pulse High Power Microwave Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India
2Power Supplies and Industrial Accelerator Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India

Received 31 December 2011; Revised 13 April 2012; Accepted 29 April 2012

Academic Editor: Pavol Bauer

Copyright © 2012 Sivananda Reddy Thondapu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper proposes a simpler and more accurate expression for estimation of leakage inductance in E core transformer, which is the most widely used transformer structure. The derived expression for leakage inductance accounts for the flux extending into air. The finite element method (FEM) analysis is made on the secondary shorted transformer to observe the H-field pattern. The results obtained from FEM analysis are used for approximating the field that is extending into air to derive an expression for leakage inductance. This expression is experimentally validated on prototype transformers of different core dimensions.