SGB Smit Webinar: Bubble formation in Liquid-filled Transformers
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Join us on January 22nd at 2 PM CET for a new webinar hosted by SGB Smit Group!
With the integration of carbon neutral renewable energy sources in the electricity network, transformers may face unpredictable load patterns with high fluctuations where overloading could become necessary for economic reasons or simply to ensure a continuous energy supply. Listed as a possible failure of short-time emergency loading, with high temperatures and rapid temperature rises, bubble formation from transformer winding insulation is a potential operational risk (IEC 60076-14). Despite the general agreement that the water content in the insulation paper is the most significant impact parameter, results vary widely amongst different studies even for conditions claimed to be similar. Additionally, the potential impact of parameters like paper/liquid types, or their state of ageing, is not fully understood. This questions the global applicability of the provided formula in the IEC/IEEE standards to calculate the bubble formation temperature and will be covered in this presentation.
About the author
Dr. Christian Pößniker
SGB Smit GroupChristian Pößniker received the PhD degree from the University of Exeter in 2024, focusing on an experimental investigation of the bubbling phenomenon in liquid-filled transformers. He received the BSc and MSc degrees in electrical and computer engineering from the Technical University of Munich, Germany, in 2015 and 2019, respectively, and the BEng (Hons) and MEng degrees in electrical engineering from the University of Queensland, Australia, in 2017. Prior to his studies, he worked as a certified electronics technician after receiving a craftsman apprenticeship in Germany in 2010. He joined the SGB-SMIT Group in 2024 as a project manager in the R&D department of the business unit distribution transformer, where he is currently mainly responsible for insulating material related research projects.
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.