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Energies 2016, 9(4), 258; doi:10.3390/en9040258

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

1
School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia
2
School of Engineering, Griffith University, Gold Coast, QLD 4222, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Issouf Fofana
Received: 8 February 2016 / Revised: 9 March 2016 / Accepted: 14 March 2016 / Published: 31 March 2016
(This article belongs to the Special Issue Power Transformer Diagnostics, Monitoring and Design Features)
View Full-Text   |   Download PDF [3682 KB, uploaded 31 March 2016]   |  

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. View Full-Text
Keywords: acidity; ageing; colour; dielectric dissipation factor (DDF); hydrolysis; natural ester (NE); mineral oil; oxidation; viscosity acidity; ageing; colour; dielectric dissipation factor (DDF); hydrolysis; natural ester (NE); mineral oil; oxidation; viscosity
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MDPI and ACS Style

Bandara, K.; Ekanayake, C.; Saha, T.; Ma, H. Performance of Natural Ester as a Transformer Oil in Moisture-Rich Environments. Energies 2016, 9, 258.

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