A Tank Resonance Model for Power Transformers

Comparison of Empty and Oil-Filled Transformer Tank Mode Shapes Using Experimental and FEM Modal Analysis

“…None of the research conducted to date where transformer tank FEM simulations were used did not consider welded joint modeling problems in the context of modal, harmonic vibration, or acoustic analysis. That includes the research where stiffeners are considered [2,3,7] and even those where tanks without stiffeners, as is the case in this research, are taken into account [4,6,9,10]. The most important contribution and novelty that this work provides is that it considers and, in detail, analyzes the problem of welded joint modeling and proposes a developed methodology and solution for the given problem.…”

“…In FEM analysis, challenges include adequate welded joint modeling, contact definition, mesh size, etc. Compared to previous research that considered transformer tank modeling [2][3][4]6,7,9,10], this study fills the gap in a welded joint modeling methodology for FEM models of the transformer tanks. As the tank is an emitter of the sound coming from the active part, adequate tank modeling in FEM is a crucial step in the accurate numerical calculation of radiated noise.…”

“…The important application of the EMA is verifying mechanical finite element method (FEM) analysis. Validation of a FEM modal analysis of a transformer tank with the EMA is presented in the literature [2][3][4][5]. In some research papers, that step is skipped, and only the vibrations of the tank in operation are measured and compared with FEM [6].…”

“…EMA can also be used for the validation of other techniques for modes and natural frequency extraction, such as operational modal analysis [15]. There is also an approach in the literature where tank resonances are calculated analytically to avoid computationally expensive FEM calculations [16].…”