Numerical Computation of the Vibroacoustic Behaviour of an Oil-Immersed Power Transformer

This paper presents a numerical calculation method that allows for the simulation of mechanical and acoustic behaviour transformer tank. In order to simulate vibroacoustic an oil-immersed power transformer, acoustic-mechanical coupled three-dimensional finite-element model was setup. The is performed in frequency domain at frequencies adjacent driving frequency. A vibration source closely resembling actual active part placed within oil-filled tank mechanically represents cavity with flexible steel boundaries. Via fluid-structure interface generates waves oil medium which partly transmit through wall structure reflect again via interface. vibrating then external air corresponding sound field calculated evaluated according IEC 60076-10. computation direct complete vibrational transformer.