Читать книгу Alternative Liquid Dielectrics for High Voltage Transformer Insulation Systems - Группа авторов - Страница 48

The production of corrosive sulphur is a major problem in transformers filled with MO. However, with natural esters, this is not a problem as they are bio‐based and extracted from plant seeds. Hence, using natural esters for insulation will not cause corrosion problems in any equipment. The corrosive sulphur is not present in NEOs, hence performing corrosive tests can confirm if there are any kind of additives added to the NEOs on purchase. During the operational lifetime, corrosive sulphur may be present in the transformer oil, even after using NEOs. This may be due to improper handling of oil during filling, reaction of the conducting parts, and solid insulation with the oil [59]. Most of the sulphur compounds are in stable form, but under certain circumstances, these stable compounds can be transformed into reactive compounds. In a study, comparison is carried out among the properties of transformer filled with MO and some NEOs [60].