Affiliation:
1. Končar—Electrical Engineering Institute Ltd., 10000 Zagreb, Croatia
2. Student at Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
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.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference23 articles.
1. Girgis, R.S., Bernesjö, M., and Anger, J. (2009, January 26–30). Comprehensive analysis of load noise of power transformers. Proceedings of the 2009 IEEE Power and Energy Society General Meeting, PES ’09, Calgary, AB, Canada.
2. Al-Abadi, A., Gamil, A., and Schatzl, F. (2018, January 19–22). Detecting and Controlling Tank Resonance of Oil Immersed Power Transformers. Proceedings of the DAGA 2018 Munchen, München, Germany.
3. Experimental Study on the Vibration Characteristics of Oil Tank Model of Oil-Immersed Transformer;Ma;IOP Conf. Ser. Earth Environ. Sci.,2020
4. Test and Analysis of Vibration Mode of Distribution Transformer Tank Structure;Wang;IOP Conf. Ser. Earth Environ. Sci.,2020
5. Case, J. (2017). Numerical Analysis of the Vibration and Acoustic Characteristics of Large Power Transformers. [Ph.D. Thesis, Queensland University of Technology].