en Power Transformers Power Transformers Only for Articles of ICEMD2024 Only for Articles of ICEMD2024 <span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">In contemporary power systems, it is crucial to ensure stable voltage levels to mitigate the fluctuations resulting from diverse load conditions. On-load tap changers (OLTCs) play a pivotal role in addressing these fluctuations by dynamically adjusting the number of turns in the transformer winding. This study investigates the integration of OLTCs within transformer designs, focusing on various methodologies related to tap winding order and configurations, which are vital for both electrical and magnetic performance. A comprehensive review of the operational principles governing different types of OLTCs is provided, highlighting their significance in voltage regulation. Furthermore, this paper analyzes the impact of linear OLTC winding order on the short-circuit impedance of a 30 MVA transformer. The findings underscore the importance of OLTC selection and design in optimizing transformer performance.</span></span> on-load tap changers, short-circuit impedance, winding order and configuration. 28 37 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-5732-1&slc_lang=en&sid=1 Mahsa Taghilou m.taghilou@aut.ac.ir 1800319475328460017699 1800319475328460017699 No Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran Mojtaba Mirsalim mirsalim@aut.ac.ir 1800319475328460017700 1800319475328460017700 Yes Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran