A geometrical approach to improve the accuracy of determining average oil temperature rise of oil-immersed power transformers
Gamil A, Al-Abadi A, Fliss M, Lingauer A, Schlücker E (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 2019
Pages Range: 56-64
Journal Issue: 15
Abstract
The way of determining average oil temperature rise of oil immersed power transformers has been kept over years in standards as the average value of the top and bottom oil temperature rises without considering the effect of thermometer pockets location on the deviation of temperature measured over the whole oil volume. The accuracy of the average oil temperature rise is important as it is the base on which the winding gradients and hot spots are determined. In this study, both temperature and position of the thermometer pockets on the cover of transformer are considered and formulated in a geometrical approach (G-Approach) to increase the accuracy of determining the average oil temperature rise. Results of the G-Approach are validated by analyzing the cooling curves (CC) and using fiber optic sensors (FOS). Although results show a higher accuracy within ±3 K compared to standard method described in IEC 60076-2 (deviation offset is higher than 5 K in average), nevertheless, the approach is kept simple and applicable for the factory acceptance test (FAT).
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Germany (DE)How to cite
APA:
Gamil, A., Al-Abadi, A., Fliss, M., Lingauer, A., & Schlücker, E. (2019). A geometrical approach to improve the accuracy of determining average oil temperature rise of oil-immersed power transformers. CIGRE Science & Engineering, 2019(15), 56-64.
MLA:
Gamil, Ahmed, et al. "A geometrical approach to improve the accuracy of determining average oil temperature rise of oil-immersed power transformers." CIGRE Science & Engineering 2019.15 (2019): 56-64.
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