Announcements
SEMINAR: Transformer-Based Solutions For The Reduction of Inrush And Phase-Hop Currents, Dr. Rasim Doğan, Thursday, December 26, 2024, 14:00, Department's Conference Hall
December 23, 2024
Within the department's seminar series, Asst. Prof. Dr. Rasim Doğan from Afyon Kocatepe University will make a talk titled "Transformer-Based Solutions For The Reduction of Inrush And Phase-Hop Currents".
All interested are invited.
Seminar Date: Thursday, December 26th, 2024
Seminar Time: 14:00
Seminar Venue: HU EEE Conference Hall
For your questions and comments:
Dr. İsmail Uyanık, uyanik@ee.hacettepe.edu.tr
ABSTRACT
A comprehensive literature review shows that transformer-based solutions are superior for the mitigation of inrush currents than external (to the transformer) solutions. The use of air gaps and low-permeability (iron) materials are known techniques for this purpose. The effectiveness of these approaches for reducing inrush and phase-hop currents is investigated. Studies are carried out on toroidal transformers, due to their broad application in power electronics devices. Contrary to common belief, it is demonstrated that air gaps do not reduce the inrush currents when a transformer is fully demagnetized. However, inrush currents can be mitigated by the use of low-permeability iron materials. It is also demonstrated that air-gaps significantly reduce inrush currents when transformers have residual flux, e.g. for phase-hop conditions. Analytical expressions are derived to compute the mitigation factor for a specific gap length. The results and formulae presented in this thesis are verified with laboratory experiments, transient simulations with validated circuit models, and 2D finite element simulations.
BIO
Rasim Dogan received the B.Sc. degree in Electrical & Electronics Engineering from Gazi University, Ankara, Türkiye, in 2008, the M.Sc. degree in Electrical Engineering from the Polytechnic Institute of New York University, Brooklyn, NY, USA, in 2012, and the Ph.D. degree in Electrical Engineering from NYU Polytechnic School of Engineering, Brooklyn, NY, USA, in 2015.
He is currently an Assistant Professor at the Department of Electrical Engineering, Afyon Kocatepe University, Afyonkarahisar-Türkiye. His research interests include the simulation and calculation of electromagnetic fields applied to transformers, power system modeling, load modeling, and renewable energy.
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