Peek into the July Edition of Transformers Magazine!
A. L. RODRÍGUEZ ET AL. – POWER TRANSFORMER UNDER SHORT-CIRCUIT FAULT CONDITIONS: A MULTIPHYSICS APPROACH
This article presents details regarding the multiphysics simulation of a power transformer under short-circuit fault conditions. Both electromagnetic and structural mechanics behaviors are analysed by FEM simulations using Altair Flux™ and Altair OptiStruct™ software in order to avoid irreversible damage to the structure and associated structural integrity risks.
Transformers’ windings experience mechanical loads from electromagnetic forces due to the currents they carry. During normal operation, the resulting stresses and strains have minor influence, therefore they do not represent the significant risk to the devices’ integrity. However, transformers can suffer from high sudden short-circuit currents that are several times higher than those during the normal operation. These short-circuit currents are a significant threat, not only from an electrical but also from the structural integrity point of view. In this paper, coupled electromagnetic and structural mechanics simulations are carried out to evaluate short-circuit fault risks in a comprehensive and accurate way.
Keywords: Laplace forces, multiphysics, short-circuit, simulation
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