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The paper presents the results of comparative studies of thermal properties of various types of natural esters used as electroinsulating liquids in transformers. Adequate thermal properties of electro-insulating liquids ensure reliable work of transformers. Two natural esters were selected for the study – one commonly used in distribution transformers, the other characterized by low viscosity. Fourier...
The paper presents analysis of thermal properties of natural ester modified by nanoparticles C60 and TiO2, used in power transformers. The measurements of thermal properties, such as thermal conductivity, kinematic viscosity, specific heat, density, and thermal expansion were carried out. Measurements were carried out at a temperature of 25 °C, 40 °C, 60 °C and 80 °C. On the basis of measurement results,...
The article presents an analysis of thermal properties of a mixture of mineral oil and synthetic ester used in transformers. The oil/ester rate was as follows: 100%/0%, 95%/5%, 80%/20%, 50%/50%, 20%/80%, 5%/95%, and 0%/100% The measured thermal properties were: thermal conductivity, specific heat, viscosity, density, and the thermal expansion factor. On the basis of measurement results, the authors...
Work on modification of insulating liquids with different nanoparticles to improve their electric properties has been done for many years. However, possible changes of thermal properties of such liquids have not been in focus. The article presents an analysis of nanoparticle influence on thermal properties of mineral oil used in transformers. The investigated nanoparticles were fullerenes C60 and...
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