Abstract
This paper is devoted to a comparative analysis of thermal ageing tests of Thermally Upgraded Kraft (TUK) and Nomex-910 papers dipped in palm kernel oil methyl ester (MEPKO), at 110, 130, and 150 °C, for 96 h each. After ageing, paper breakdown voltage (BDV), oils’ dissipation factor, dielectric constant and oxidation stability were determined. Nomex’s BDV was greater than TUK BDV. However, the dissipation factor of the Nomex samples is slightly higher than that of TUK, and the dielectric constant has the opposite behaviour. In addition, the decay content of Nomex/MEPKO was greater than with TUK/MEPKO. These experimental findings indicate that Nomex can be mainly used in high voltage, and TUK in medium voltage power transformers respectively, to allow judicious use of their individual characteristics and money savings.
Acknowledgements
The authors wish to express their sincere thanks to all the members of the Electric Energy Systems Research Team for their valuable and constructive suggestions during the planning and development of this research work. Special thanks to Prof. Anatole Guy Blaise Azebaze, Mr. Arnol Tchetchou, Mrs Jon-Ewn Tiba Danielle and Mrs Nguimjeu Tsague Reine Olivia of the Postgraduate School for Pure and Applied Sciences of the University of Douala for their help with electrical and chemical techniques.
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Author contributions: Conceptualisation GOB, ETN, GMM and AMI; methodology, GOB, GMM and AMI; validation, GOB, ETN, GMM and AMI; formal analysis, GOB, ETN and GMM; resources, AMI; writing—original draft preparation, GOB, ETN and AMI; writing—review and editing, GOB, ETN and GMM; supervision, GMM and AMI; project administration, AMI. All authors have read and agreed to the published version of the manuscript.
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Research funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Data availability statement: The data used to write this paper are available from the corresponding author on reasonable request.
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