Enhancement of Dielectric Characteristics of Blended Natural Ester Oil with Transformer Oil with Optimal Ratio using Grey Relational Analysis

In the present High voltage application system, natural ester oils are being considered as a viable solution to the replacement of Petroleum-based mineral oil due to their promising environmental conditions, like being renewable, biodegradable, not hazards to water, having a low fire point, and having a high flash point. Blended techniques play a crucial role in this research. This paper investigates that vegetable oils such as Groundnut Oil (GO) and Rice Bran Oil (RBO) have low viscosity, low fatty content, and high breakdown strength in nature, so it suggests better alternatives for mineral oils. Blended GO and RBO oils with various concentrations give the desired performance compared to blended mineral oil. Although this research describes the comparison between various concentrations of vegetable oils and experimental measurements of dielectric properties, From the experimental results, it can be concluded that the mixed ratio samples of 60:40 and 70:30 of groundnut and rice bran vegetable oils enhanced critical properties, which proves the better alternative solution to the transformer mineral oil. Further, the optimized results for the system's insulation can be analyzed using the Grey relational analysis (GRA) method.