Abstract: To study the multi-physics coupling characteristics of power electronic transformers in distribution networks, operational state information of substations was collected, and the ANSYS 3D transient solver was employed to obtain the electric and magnetic field state changes during transformer operation. Using time points as indices, electromagnetic information of each transformer unit was mapped to corresponding positions in the vibration field, enabling the perception of internal unit vibrations in the transformer twin. The leakage inductance value fluctuated within the range of 14200~14400 mH at low frequencies and 11.03~11.08 mH at high frequencies. After the support strip failure, deformation exhibited an upper-lower symmetric distribution, with the maximum deformation occurring in the middle winding region. Under high-frequency excitation, both the leakage inductance value and fluctuation were significantly lower than those under low-frequency excitation, and the leakage inductance waveform under high-frequency excitation lacked regularity except in specific cases. The failure of the support strip had a significant impact on the deformation of the transformer's low-voltage winding, with higher failure levels leading to greater and more unstable winding deformation.