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This document describes the determination of the saturated inductance of a transformer, which is the slope of the saturation curve ĭ(I) under highly saturated conditions. This parameter, which has a strong impact on the overvoltages when energizing a transformer, has been determined from analytic formulae for a shell-type transformer. Comparisons with the values derived from an electromagnetic 3D calculation and on-site tests are also given in this paper.