A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy
This paper presents an alternative approach to determine the simplified top-oil temperature (TOT) based on the pathway of energy transfer and thermal-electrical analogy concepts. The main contribution of this study is the redefinition of the nonlinear thermal resistance based on these concepts. An a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI
2017
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| Online Access: | http://psasir.upm.edu.my/id/eprint/63579/1/A%20Simplified%20Top-Oil%20Temperature%20Model%20for%20Transformers%20Based%20on%20the%20Pathway%20of%20Energy%20Transfer%20Concept%20and%20the%20Thermal-Electrical%20Analogy.pdf |
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| author | Roslan, Muhammad Hakirin Azis, Norhafiz Kadir, Mohd Zainal Abidin Ab Jasni, Jasronita Ibrahim, Zulkifli Ahmad, Azalan |
| author_facet | Roslan, Muhammad Hakirin Azis, Norhafiz Kadir, Mohd Zainal Abidin Ab Jasni, Jasronita Ibrahim, Zulkifli Ahmad, Azalan |
| author_sort | Roslan, Muhammad Hakirin |
| collection | UPM |
| description | This paper presents an alternative approach to determine the simplified top-oil temperature (TOT) based on the pathway of energy transfer and thermal-electrical analogy concepts. The main contribution of this study is the redefinition of the nonlinear thermal resistance based on these concepts. An alternative approximation of convection coefficient, h, based on heat transfer theory was proposed which eliminated the requirement of viscosity. In addition, the lumped capacitance method was applied to the thermal-electrical analogy to derive the TOT thermal equivalent equation in differential form. The TOT thermal model was evaluated based on the measured TOT of seven transformers with either oil natural air natural (ONAN) or oil natural air forced (ONAF) cooling modes obtained from temperature rise tests. In addition, the performance of the TOT thermal model was tested on step-loading of a transformer with an ONAF cooling mode obtained from previous studies. A comparison between the TOT thermal model and the existing TOT Thermal-Electrical, Exponential (IEC 60076-7), and Clause 7 (IEEE C57.91-1995) models was also carried out. It was found that the measured TOT of seven transformers are well represented by the TOT thermal model where the highest maximum and root mean square (RMS) errors are 6.66 °C and 2.76 °C, respectively. Based on the maximum and RMS errors, the TOT thermal model performs better than Exponential and Clause 7 models and it is comparable with the Thermal-Electrical 1 (TE1) and Thermal-Electrical 2 (TE2) models. The same pattern is found for the TOT thermal model under step-loading where the maximum and RMS errors are 5.77 °C and 2.02 °C. |
| first_indexed | 2024-03-06T09:44:54Z |
| format | Article |
| id | upm.eprints-63579 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:44:54Z |
| publishDate | 2017 |
| publisher | MDPI |
| record_format | dspace |
| spelling | upm.eprints-635792018-11-05T01:23:51Z http://psasir.upm.edu.my/id/eprint/63579/ A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy Roslan, Muhammad Hakirin Azis, Norhafiz Kadir, Mohd Zainal Abidin Ab Jasni, Jasronita Ibrahim, Zulkifli Ahmad, Azalan This paper presents an alternative approach to determine the simplified top-oil temperature (TOT) based on the pathway of energy transfer and thermal-electrical analogy concepts. The main contribution of this study is the redefinition of the nonlinear thermal resistance based on these concepts. An alternative approximation of convection coefficient, h, based on heat transfer theory was proposed which eliminated the requirement of viscosity. In addition, the lumped capacitance method was applied to the thermal-electrical analogy to derive the TOT thermal equivalent equation in differential form. The TOT thermal model was evaluated based on the measured TOT of seven transformers with either oil natural air natural (ONAN) or oil natural air forced (ONAF) cooling modes obtained from temperature rise tests. In addition, the performance of the TOT thermal model was tested on step-loading of a transformer with an ONAF cooling mode obtained from previous studies. A comparison between the TOT thermal model and the existing TOT Thermal-Electrical, Exponential (IEC 60076-7), and Clause 7 (IEEE C57.91-1995) models was also carried out. It was found that the measured TOT of seven transformers are well represented by the TOT thermal model where the highest maximum and root mean square (RMS) errors are 6.66 °C and 2.76 °C, respectively. Based on the maximum and RMS errors, the TOT thermal model performs better than Exponential and Clause 7 models and it is comparable with the Thermal-Electrical 1 (TE1) and Thermal-Electrical 2 (TE2) models. The same pattern is found for the TOT thermal model under step-loading where the maximum and RMS errors are 5.77 °C and 2.02 °C. MDPI 2017 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/63579/1/A%20Simplified%20Top-Oil%20Temperature%20Model%20for%20Transformers%20Based%20on%20the%20Pathway%20of%20Energy%20Transfer%20Concept%20and%20the%20Thermal-Electrical%20Analogy.pdf Roslan, Muhammad Hakirin and Azis, Norhafiz and Kadir, Mohd Zainal Abidin Ab and Jasni, Jasronita and Ibrahim, Zulkifli and Ahmad, Azalan (2017) A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy. Energies, 10 (11). pp. 1-15. ISSN 1996-1073 https://www.mdpi.com/1996-1073/10/11/1843 10.3390/en10111843 |
| spellingShingle | Roslan, Muhammad Hakirin Azis, Norhafiz Kadir, Mohd Zainal Abidin Ab Jasni, Jasronita Ibrahim, Zulkifli Ahmad, Azalan A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title | A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title_full | A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title_fullStr | A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title_full_unstemmed | A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title_short | A simplified top-oil temperature model for transformers based on the pathway of energy transfer concept and the thermal-electrical analogy |
| title_sort | simplified top oil temperature model for transformers based on the pathway of energy transfer concept and the thermal electrical analogy |
| url | http://psasir.upm.edu.my/id/eprint/63579/1/A%20Simplified%20Top-Oil%20Temperature%20Model%20for%20Transformers%20Based%20on%20the%20Pathway%20of%20Energy%20Transfer%20Concept%20and%20the%20Thermal-Electrical%20Analogy.pdf |
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