Resonance Behavior in Transformer Windings – A Numerical Approach
Hosted by: Transformers Academy
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Under specific operating conditions, resonances in transformer windings can lead to voltage amplitudes significantly higher than those occurring at nominal frequencies. Such voltage amplifications may result in severe issues, including the breakdown of insulation layers and subsequent equipment failure. Predicting the occurrence of these resonances is generally challenging due to the complex electromagnetic and structural interactions within the winding system. A common method to analyze these effects is the use of FEM simulations; however, this approach typically requires substantial computational resources and long processing times. Thus, we present a numerical calculation program that enables the simulation of the resonance behavior of cast resin coils based on layer winding technology with considerably reduced computational effort and simulation time. The proposed approach allows for an efficient assessment of resonance phenomena while maintaining a high level of accuracy.
About the author
Emma Gasser
SGB Smit GroupEmma Grasser studied physics at the University of Regensburg and completed her master’s degree at the Institute for Experimental and Applied Physics in 2023. Since then, she has been working in the R&D department for cast resin transformers at Starkstrom-Gerätebau GmbH.
Sudheer Mokkapaty
SGB Smit GroupSudheer Mokkapaty received Bachelor of Technology degree in Electrical & Electronics Engineering from Jawaharlal Nehru Technological University, Hyderabad, India and Master of Science degree in Electrical Power Engineering from Brandenburg University of Technology, Cottbus, Germany in 2011 and 2015 respectively. Since 2014, Mr. Mokkapaty has been associated with the product development of electrical transformers initially as a student and later as a R&D Engineer in the business unit Distribution Transformers, SBG GmbH, Neumark. Since the beginning of 2023, he has been working with the SGB-SMIT Group as R&D Project Manager and currently as Group Innovation Manager. His main areas of interest are innovation, research and development management, FEM simulation of HV and LV applications, electrical steel technologies and product development in transformers. He has authored & co-authored multiple technical papers on transformers for different international technical conferences and fairs.