A Study of the Properties of Electrical Insulation Oils and of the Components of Natural Oils

Milan Spohner


This paper presents a study of the electrical and non-electrical properties of insulating oils. For the correct choice of an electrical insulation oil, it is necessary to know its density, dynamic viscosity, dielectric constant, loss number and conductivity, and the effects of various exposure factors. This paper deals with mathematical and physical principles needed for studying and making correct measurements of the dynamic viscosity, density and electrical properties of insulation oils. Rheological properties were measured using an A&D SV-10 vibratory viscometer, and analytical balance with density determination kit, which operates on the principle of Archimedes’ law. Dielectric properties were measured using a LCR meter Agilent 4980A with connected with the Agilent 16452A test fixture for dielectric liquids.


conductivity; density; dielectric constant; FAME; insulating oil; lauric acid; loss number; methyl ester; midel; oleic acid; rapeseed oil; stearic acid; transformer oil; vegetable oil; vibratory viscometer; viscosity

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ISSN 1210-2709 (Print)
ISSN 1805-2363 (Online)
Published by the Czech Technical University in Prague