Finite Element Method Based Modelling and Analysis of Partial Discharge Acoustic Wave Propagation in an Oil-Filled Power Transformer

This paper presents an analysis of acoustic pressure wave distribution in a power transformer due to partial discharge (PD) using the finite-element-method (FEM) based software COMSOL Multiphysics. The acoustic PD is simulated at four different locations of the transformer in the core, in the low voltage (LV) winding, in the high voltage (HV) winding and in the oil duct, respectively. The acoustic pressure wave generated by the PD is investigated in the transient state. Results suggest that the acoustic pressure wave propagation inside the transformer depends on the PD induced location. Moreover, a more significant acoustic pressure gradient is perceived in the region with a higher speed of sound.