Diagnostics of Transformer Oil Condition by Its Chromaticity Coordinates

The main element of the electric power industry are power transformers, the bulk component of which is transformer oil. The aging of transformer oil leads to an increase in acid number and dielectric losses, to a change in the color of the oil and, as a result, to a decrease in the reliability of the entire insulation system of oil-filled equipment. The paper presents the results of a study of transformer oils with the determination of their chromaticity coordinates, and the relationship of chromaticity coordinates with the dielectric loss tangent and the acid number of the oil is also established.