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Abstract
In the past, saturation in the leakage paths of synchronous machine has been neglected. Recent study [1] shows that the leakage reactances may be reduced by 12–25 percent under severe fault conditions. This paper deals with the effects of this reduction in the machine's behavior during transient conditions. A technique has been developed to characterize the way in which the leakage reactances change with current. This paper also describes the formulation of a mathematical representation for leakage saturation to be included in conventional state space model of synchronous generator. The method has been developed and verified using the tests performed on a 3 kVA laboratory machine and on a 685 MW generator.