Evaluation of Physical-Chemical Characteristics of Mineral Oils Mixed with Synthetic Esters

In some control analyses of the power transformers, it is possible to find signs of contamination of the mineral oil with other insulating liquids, such as synthetic esters, natural esters or silicones due to problems in oil filling or maintenance procedures. Each of these liquids has different prop...

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Bibliographic Details
Published in2019 6th International Advanced Research Workshop on Transformers (ARWtr) pp. 78 - 82
Main Authors Villaverde, M. Zabalegui, Cuadros, D. Urquiza
Format Conference Proceeding
LanguageEnglish
Published RedINtrnasf 01.10.2019
Subjects
Contamination
Dielectrics
ester
FTIR
mineral oil
Minerals
mixed oil
Oil insulation
Oils
power transformer
Power transformer insulation
synthetic oil
UV-VIS
Viscosity
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Summary:In some control analyses of the power transformers, it is possible to find signs of contamination of the mineral oil with other insulating liquids, such as synthetic esters, natural esters or silicones due to problems in oil filling or maintenance procedures. Each of these liquids has different properties and applications, and their behaviour in service may be different from that of mineral oil. This paper shows the study of the basic physicochemical properties, such as the viscosity, oxidation, the acidity, the flash point and the dielectric dissipation factor (tan δ) of several concentration levels of a mixture of mineral oil (MO) and synthetic ester (SE), as low as 2% of SE/MO, and its correlation with the FTIR and UV-VIS signals. The results are applied to estimate the variation of the properties of several power transformers in service and improve the diagnosis of their condition assessment of the mineral oil.
DOI:10.23919/ARWtr.2019.8930179