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Öğe Investigating and calculating the temperature of hot-spot factor for transformers(Institute of Advanced Engineering and Science, 2023) Yahya, Khalid; Attar, Hani; Issa, Haitham; Ramadan Dofan, Jamal Ali; Iqteit, Nassim A.; Yahya, Adel E.M.; Solyman, Ahmed Amin AhmedThis article explores the measurement of temperature in transient states, utilizing the principles of heat transfer and thermal-electrical metaphor. The study focuses on the nonlinear thermal resistances present in various locations within a distribution transformer, while taking into account variations in oil physical variables and temperature loss. Real-time data obtained from heat run tests on a 250-MVA-ONAF cooled unit, conducted by the transformer manufacturer, is used to verify the thermal designs. The observations are then compared to the loading framework of the IEC 60076-7:2005 system. The findings of this research provide a better understanding of temperature measurement in transient states, particularly in distribution transformers, and can be applied to the design and development of more efficient and reliable transformer systems. © 2023 Institute of Advanced Engineering and Science. All rights reserved.