JSE_V4_N4_RP2 S. Sankar G. Gokula Krishnan Journal on Software Engineering 2230 – 7168 4 4 11 17 Transformer, Wide Band Model, Electromagnetic Transients, Emtp-rv, Measurement SoFT is a new method and tool which measures and models linear electrical network components in a wide frequency band with unprecedented accuracy. This is achieved by a special modal based measurement technique in combination with suitable rational fitting and passivity enforcement methods. The models are easily imported into most commonly used simulation software. This paper demonstrates the SoFT tool computations in a comparison between A) time-domain measurements of a lightning impulse test of a power transformer, B) simulation of the test results using a SoFT model, and C) simulation of the test results using a lumped-element circuit simulation model based on geometrical transformer design information. April - June 2010 Copyright © 2010 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1168