engleski

Physical and chemical analysis of transformer oil

Nowadays, electricity is considered to be the basis of life both in households and in industry. It is important to transmit electricity from the place of generation to the end user. During the transmission itself, the voltage decreases and there is a loss of electricity due to the resistance in the power lines. Transformer is one of the devices that transmit electricity, and its function is to convert alternating current of a certain voltage into alternating current of a higher or lower voltage, thus reducing the losses during electricity transmission [1]. Each transformer contains oil, which serves as an insulator and coolant, and provides information about the quality of the transformer [2]. Transformer oil oxidizes over time and becomes contaminated, which is reflected in its chemical and physical properties and ultimately leads to poor oil quality for transformer operation. In this study, oil quality was determined by oil appearance and color, refractive index, density, surface tension, dielectric loss coefficient, and specific resistance. Eight oil samples taken in the Slavonia region were analyzed, and four samples were found to be defective. Analysis of transformer oil is important, because incorrect estimation of oil quality leads to shortening of the transformer's service life.

transformer oil ; surface tension ; refractive index ; specific resistance ; dielectric loss coefficient

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