In order to study the electromagnetic properties of double fed induction wind generator (DFIG) with the ITSCFSW, a finite element model based on Ansys Maxwell was established. Then the simulations under three operations conditions such as noload operation conditions, gridconnected operation and varying degrees of the stator winding interturn short circuit fault were completed. According to theoretical formulas of characterization, quantitative analysis of vibration, current and temperature characterization of air gap flux density distortion in three working conditions was done based on energy perspective. Finally, the advantages and disadvantages of each characterization were compared, and the feasibility analysis of diagnosis was carried out. The stator current was determined as the characteristic factor to reflect the air gap magnetic field of the ITSCFSW, and the vibration and temperature were complement and verification for fault detection, which would provide a theoretical basis for the signal feature selection of generator’s fault diagnosis.