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Basically, these are ester group compounds that are produced from glycerine and sebacic acids [29]. They are usually fatty acids having high fire point, high breakdown voltage, and good biodegradability. The natural esters are usually triglycerides and are found to have low oxidation stability. The general molecular structure of natural esters is similar to the molecular structure of vegetable oils [30]. These oils were restricted to distribution class transformers or breather‐free transformers with the concern toward their low oxidation stability. Nevertheless, attempts are being in pipeline for further improving the oxidation stability of natural esters.