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Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy


Citation

Roslan, Muhammad Hakirin and Azis, Norhafiz and Jasni, Jasronita and Ibrahim, Z. (2017) Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy. Pertanika Journal of Science & Technology, 25 (spec. Feb.). pp. 151-160. ISSN 0128-7680; ESSN: 2231-8526

Abstract / Synopsis

Top-Oil Temperature (TOT) is one of the basic components to estimate the Hot-Spot temperature (HST) of the transformers. This paper presents an alternative TOT model based on the heat transfer theory that utilises Nonlinear Thermal Resistance (NTR) and Lumped Capacitance (LC) approaches. It is applied in a thermal-electrical analogy and the heat transfer equivalent equation is determined. This model is tested on a measured TOT of 250 MVA ONAF and 400 MVA ONAF transformers obtained from IEC 60076-7 and previous research. A comparison of TOT is carried out with the existing models IEC 60076-7 exponential and IEEE Loading Guide clause 7 methods. It is found that the thermal model based on the NTR and LC approach could determine the measured TOT closer than the existing methods available in the standards.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Publisher: Universiti Putra Malaysia Press
Keywords: Top-oil temperature; Thermal model; Transformers
Depositing User: Nabilah Mustapa
Date Deposited: 30 Jun 2017 17:49
Last Modified: 05 Jul 2017 11:42
URI: http://psasir.upm.edu.my/id/eprint/55855
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