Performance of Natural Ester as a Transformer Oil in Moisture-Rich Environments

Kapila Bandara, Chandima Ekanayake, Tapan Saha and Hui Ma
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Kapila Bandara: School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
Chandima Ekanayake: School of Engineering, Griffith University, Gold Coast, QLD 4222, Australia
Tapan Saha: School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
Hui Ma: School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia

Energies, 2016, vol. 9, issue 4, 1-13

Abstract: Interest has risen among utilities in using natural ester (NE) insulating oils in transformers as a substitute for conventional mineral oil. However, present understanding on aging behaviour of NE-paper composite insulation system and knowledge on application of existing condition monitoring tools for NE-based insulation are inadequate. This limits the cost effective and reliable field applications of NE insulating oil. To pave the way the application of NE-based insulation in transformers, a systematic study has been performed to compare the aging behaviour of transformer grade pressboard (PB) impregnated in NE and conventional mineral oil. Applicability of a number of chemical and physical parameters, including acidity value, dielectric dissipation factor (DDF), viscosity, and colour for assessing the quality of NE insulating oil is also discussed in this paper. Comparisons are made based on the limiting values provided in the related IEEE Standard and properties of mineral oil under similar aging conditions.

Keywords: acidity; ageing; colour; dielectric dissipation factor (DDF); hydrolysis; natural ester (NE); mineral oil; oxidation; viscosity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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