Caracterização de óleos vegetais para transformadores elétricos.

Abstract

This work aimed to determine the physicochemical characteristics of the commercial vegetal oils of regional origin: soy, corn and cotton, and verify which of those has advantages over the mineral oil. The properties that were analyzed were: color, density, viscosity, dielectric strength, oxidation stability, corrosive sulfur, water percentage, total index of acidity and thermooxidative stability. The thermooxidative stability is one of the most critical aspects in most of applications of insulating oils. The work focuses mainly on the realization of a kinetic study of the oils oxidation. The vegetal oils analyzed presented an advantage over the mineral oil, regarding to the absence of sediment production.