Surge Current Withstand Capability of Natural Ester Oil: A Comparison to Gas-to-Liquid Transformer Oil

The basic electrical characteristics of a natural ester oil are experimentally investigated and compared to gas-to-liquid transformer oil with emphasis given to the endurance against surge events. An accelerated degradation test is conducted using a sequence of current impulses generated through a c...

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Bibliographic Details
Published inIEEE transactions on industry applications pp. 1 - 10
Main Authors Tsovilis, Thomas, Hadjicostas, Alexandros Y., Staikos, Evangelos T., Datsios, Zacharias G., Peppas, George D.
Format Journal Article
LanguageEnglish
Published IEEE 03.09.2024
Subjects
Degradation
Dielectric liquids
dielectric strength
Dielectrics
electrical conductivity
impulse current
Liquids
nanofluids
Oils
Permittivity
surge endurance
Surges
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Summary:The basic electrical characteristics of a natural ester oil are experimentally investigated and compared to gas-to-liquid transformer oil with emphasis given to the endurance against surge events. An accelerated degradation test is conducted using a sequence of current impulses generated through a combination wave generator. This test is employed to investigate changes in the electrical conductivity of the oil, serving as a crucial performance indicator for assessing its surge current withstand capability. Experimental results on the surge degradation of the natural ester oil are compared to those of gas-to-liquid oil, which is commonly used in power transformers. A discussion is made on the possible use of natural ester oils as a liquid matrix for environmentally friendly surge-proof nanofluids to substitute transformer oils, which are commonly employed as insulating liquids and coolants in the power industry.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2024.3454232