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

Karlo Petrović (), Danilo Dobrić, Ivan Gotić and Tomislav Župan
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Karlo Petrović: Končar—Electrical Engineering Institute Ltd., 10000 Zagreb, Croatia
Danilo Dobrić: Student at Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
Ivan Gotić: Končar—Electrical Engineering Institute Ltd., 10000 Zagreb, Croatia
Tomislav Župan: Končar—Electrical Engineering Institute Ltd., 10000 Zagreb, Croatia

Energies, 2024, vol. 17, issue 3, 1-15

Abstract: In this paper, the mode shapes of an empty and oil-filled transformer experimental model tank are obtained using 3D finite element method (FEM) modal analysis. For verification of the FEM analysis results, experimental modal analysis (EMA) is carried out in both cases using appropriate impact hammers and accelerometers. Simulated and measured results are visualized and compared for mode shapes in a frequency range of interest for both empty and oil-filled tanks. In order to avoid overly stiff FEM models of transformer tanks, the welded joint modeling technique is presented and analyzed in detail. For an oil-filled tank, the most accurate results are calculated in the model where the welded joint is modeled as half the tank wall’s thickness. In that case, the mean absolute error for the given ten-mode shapes is 1.7 Hz. Also, mesh sensitivity analysis is performed. It is concluded that a 10 mm maximum element size is an optimal solid (3D) mesh. However, shell mesh can be used to reduce computing requirements.

Keywords: mode shapes; FEM modal analysis; transformer tank; experimental modal analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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