Investigating and calculating the temperature of hot-spot factor for transformers

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YAHYA H., Attar H., Issa H., Ramadan Dofan J. A., Iqteit N. A., Yahya A. E., ...More

Indonesian Journal of Electrical Engineering and Computer Science, vol.30, no.3, pp.1297-1307, 2023 (Scopus) identifier


This 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.