Читать книгу Alternative Liquid Dielectrics for High Voltage Transformer Insulation Systems - Группа авторов - Страница 31

Soybean oil is one of the most prominent NEO, which is being used as an insulating agent in transformers [28, 29]. It is extracted from soybean seeds and mainly consists of unsaturated fatty acids like the polyunsaturated α‐linolenic acid, linoleic acid, and monounsaturated oleic acid [30]. This oil has lower oxidation stability and its viscosity is also on the higher side. This oil polymerizes easily contributing to even higher levels of viscosity. With the addition of antioxidants, it shows relatively better oxidation stability and lower viscosity [31]. Efforts are carried out to obtain a better soybean oil with enhanced properties. This oil shows better oxidation stability when used with antioxidants like citric acid and the tert‐butyl hydroquinone [31]. The oil is also winterized to lower the pour point to be suitable for use in colder climates. Studies have shown that some of the properties of soybean oil are superior to that of MO [32].