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The paper outlines the development of expressions for the transient armature and field currents of an asynchronised synchronous machine (a.s.m.) following a sudden 3-phase short circuit. The field time constant of such a machine may be deliberately reduced by feedback, so that the desirable operating characteristics are obtained. The transientcurrent expressions are therefore derived for different values of this time constant, and comparisons are made between theoretical and experimental results for a 2 kVA machine.