Original scientific paper

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

Bruno Bosnjak orcid.org/0000-0001-9432-8223 ; Hyundai Electric Switzerland AG, Zürich, Switzerland
Dariusz Nowak ; Hyundai Electric Switzerland AG, Zürich, Switzerland
Sever Michalowski ; Hyundai Electric Switzerland AG, Zürich, Switzerland

Abstract

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

Keywords

Power Transformer Noise, Finite Element Method, Multiphysics, Vibration, Tank

Hrčak ID:

247105

URI

https://hrcak.srce.hr/247105

Publication date:

30.12.2019.

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