Experimental studies on the influence of benzyl benzoate on viscosity of vegetable oil based insulating liquids for power transformer

• Main Authors: Bakrutheen Moosasait, Willjuice Iruthayarajan Maria Siluvairaj, Ramachandran Eswaran
• Format: Article
• Language: English
• Published: Wiley 2021-08-01
• Series: IET Science, Measurement & Technology
• Online Access: https://doi.org/10.1049/smt2.12053

Abstract For insulating liquids in power transformers, the development of low viscous vegetable oil based liquids has been proposed in this work. The viscosity reduction of vegetable oil based liquids has been achieved by processing of the natural esters with different levels of concentration of aromatic solvent of benzyl benzoate. Two categories of vegetable oil based liquids, namely edible such as sunflower oil, palm oil and sesame oil, and non edible such as honge oil, neem oil and punna oil are considered for this investigation. The analysis is also extended to investigate the influence of benzyl benzoate on other critical properties of vegetable oil based liquids such as breakdown voltage, flash point, moisture content, acidity, and density. From the experimental results, it is revealed that inclusion of benzyl benzoate has shown considerable reduction in viscosity of vegetable oil based liquids. Also based on properties of processed natural esters, results have given away the positive encouragement towards the development of low viscous insulating liquids with combined benzyl benzoate and natural esters for application in high voltage power transformers.