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This paper aims at presenting a method for modeling and simulation of internal single phase-to-ground faults in d-q axis model in stator windings of large synchronous machines. The method of partitioning the stator windings is used in analyzing the internal faults. This Partitioning method, under internal faults determines inductances of the affected windings which, is extended. In this paper, we modeled the machine in d-q axis models under specific conditions by using the obtained inductances and park transformation. The application of this method is analyzing internal single phase-to-frame faults. Finally, this method is simulated to evaluate an internal fault in stator windings.