Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy
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 appli...
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| Format: | Article |
| Language: | English |
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Universiti Putra Malaysia Press
2017
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| Online Access: | http://psasir.upm.edu.my/id/eprint/55855/ http://psasir.upm.edu.my/id/eprint/55855/1/18-JTS%28S%29-0132-2016-4thProof.pdf |
| _version_ | 1848852918868901888 |
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| author | Roslan, Muhammad Hakirin Azis, Norhafiz Jasni, Jasronita Ibrahim, Z. |
| author_facet | Roslan, Muhammad Hakirin Azis, Norhafiz Jasni, Jasronita Ibrahim, Z. |
| author_sort | Roslan, Muhammad Hakirin |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T10:45:43Z |
| format | Article |
| id | upm-55855 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T10:45:43Z |
| publishDate | 2017 |
| publisher | Universiti Putra Malaysia Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-558552017-07-05T03:42:30Z http://psasir.upm.edu.my/id/eprint/55855/ Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy Roslan, Muhammad Hakirin Azis, Norhafiz Jasni, Jasronita Ibrahim, Z. 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. Universiti Putra Malaysia Press 2017 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/55855/1/18-JTS%28S%29-0132-2016-4thProof.pdf 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 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JST%20Vol.%2025%20(S)%20Feb.%202017/18-JTS(S)-0132-2016-4thProof.pdf |
| spellingShingle | Roslan, Muhammad Hakirin Azis, Norhafiz Jasni, Jasronita Ibrahim, Z. Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title | Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title_full | Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title_fullStr | Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title_full_unstemmed | Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title_short | Top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| title_sort | top-oil temperature model for transformers based on nonlinear thermal resistance, lumped capacitance and thermal-electrical analogy |
| url | http://psasir.upm.edu.my/id/eprint/55855/ http://psasir.upm.edu.my/id/eprint/55855/ http://psasir.upm.edu.my/id/eprint/55855/1/18-JTS%28S%29-0132-2016-4thProof.pdf |