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A variety of models has been developed to represent transformers in switching surge studies. However, there is a paucity of data on the characteristics of large power transformers to provide parameters for utilization in the models. This paper describes a low power field method of saturating large transformers and plotting the instantaneous magnetization curve. Results on a 25 MVA unit allowed the accuracy of several equivalent circuits to be compared. Minor hysteresis loops were observed to obey simple relationships from which two magnetizing inductance models were developed
Dick et al. (1981) studied this question.