Abstract
Globally, natural ester based insulating oils are playing a significant role for insulation design of the transformer. Because of, ester based insulating oil’s critical properties are meeting the standard requirement as liquid dielectrics for transformer. For past century, mineral oil is used as an insulating liquid as well as heat transfer agent for transformer. However, it has less biodegradable characteristics, so which causes negative environmental effects on atmosphere. In addition, availability of fossil fuel is very low. Therefore, the manuscript proposes natural ester oil is alternate liquid dielectrics for transformer. However, critical properties of vegetable oil based liquid dielectrics are depends on the fatty acids. Therefore, two types of oil samples are used such as high saturated fatty acid ester oil (SFEO) and unsaturated fatty acid ester (UFEO), respectively. Initially, oil samples critical properties are measured according to the standard. Subsequently, accelerated thermal aging study has been carried out on all the oil samples for evaluating thermal stability of oil samples. Then, combustible gas estimation of oil samples has been carried out by Dissolved Gas Analyzer. Results are shows that, critical properties of SFEO is comparable that of others. In addition, degradation rate of insulating material is low when it immersed in SFEO that of other oil samples. Finally, SFEO is emitting low combustive gas that of mineral oil with catalyst.
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