Analysis of Transformer Vibration Caused by Stray Currents

With the large-scale construction and operation of the metro, the urban power grid has seen the intrusion of metro stray currents causing transformer DC paramagnetism, resulting in increased transformer vibration and noise, and increased probability of failure. This paper firstly introduces the propagation path of transformer vibration, theoretically analyses the vibration spectral characteristics of transformer DC bias operation, and then through the vibration measurement of a 500kV transformer, the measured data will be subjected to spectral analysis, time-domain analysis, as well as the analysis of acceleration in different positions and different axial directions of the transformer, and obtains the influence law of stray currents on the vibration of the transformer.