経年変圧器油の飽和水分溶解量と温度, 酸価, 分子量との関係

概要

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The water content in oil-filled electrical equipment is important in connection with evaluation of dielectric strength of insulating oil, deterioration of insulating materials, and the bubble evolution in transformer windings during overload. So the water content and the solubility of water in insulating oil that is represented by saturated water content (Ws), is an essential part of transformer condition monitoring and maintenance. It is well known that the main factors determining Ws are temperature, aromatic content, and acid number. However, changes in acid number cannot explain changes in Ws. It has been reported that in the process of oxidative deterioration of the insulating oil, molecular weight changes. However, the change in molecular weight due to oxidative deterioration has not been considered in evaluation of Ws. In this paper, we have proposed a new estimating equation of Ws considering the changes in molecular weight of the insulating oil. The new estimating equation for Ws includes temperature, acid number, and molecular weight, and it was possible to estimate Ws in insulating oils that have various acid value and aromatic content. And it was found that deviations between the calculated values and the experimental values were less than 10%.
The Institute of Electrical Engineers of Japanの論文