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Insulation failure of traction motor stator coil depends on the continuous stress imposed onit and knowing its insulation condition is an issue of significance for proper safety operation. In this diagnosis method that occurs at the stator coil of a traction motor was studied. For PD data acquisition, three defective models were made; internal void discharge model, slot discharge model and surface discharge model. PD data for recognition were acquired from a PD detector. Statistical distributions and parameters were calculated to perform recognition between model discharge sources. These statistical distribution parameters are applied to classify PD sources by the N with a good recognition rate on the discharge sources.