Liquid insulation media is used for insulation and cooling purpose inside the transformer. Currently, transformers are using petroleum based mineral oil, which poses a serious hazardous environmental impact, since the mineral oil is non-renewable and non-biodegradable. Although, the increased cost and depleting nature of mineral oil cause an emergent need to use suitable alternatives to mineral oils that are biodegradable and environmentally friendly. In response to this resource issue, various vegetable oils, namely Sunflower oil, Soya bean oil, and a blend of Sunflower and Olive (BSO) oil are suitable alternatives for transformer insulation in high voltage systems. The afore-mentioned vegetable oils are subjected to multi-aging and comparative analysis is performed with mineral oil. Further, the dielectric and thermal properties of vegetable oils are tested before and after aging. Fourier Transform Infrared spectroscopy, water content, breakdown voltage, viscosity, flash point, tan delta, and pour point tests are performed on vegetable oils before and after aging. Finally, a comparative analysis of vegetable oils with mineral oil is provided to prove the efficacy of the proposed vegetable oils. The BSO oil resulted in higher breakdown strength and good thermal behavior when subjected to the abovementioned various diagnostic measurement tests in comparison to other oils.

液体绝缘介质用于变压器内部的绝缘和冷却目的。目前，变压器使用的是石油基矿物油，这会对环境造成严重的危害，因为矿物油是不可再生和不可生物降解的。尽管如此，矿物油的成本增加和消耗性质导致迫切需要使用可生物降解且环境友好的矿物油的合适替代品。针对这一资源问题，各种植物油，即葵花籽油、大豆油以及葵花籽油和橄榄油 (BSO) 混合油，都是高压系统中变压器绝缘的合适替代品。对上述植物油进行多次老化，并与矿物油进行比较分析。更多，在老化前后测试植物油的介电和热性能。在老化前后对植物油进行傅立叶变换红外光谱、水含量、击穿电压、粘度、闪点、tan delta 和倾点测试。最后，提供了植物油与矿物油的比较分析，以证明所提出的植物油的功效。与其他油相比，BSO 油在进行上述各种诊断测量测试时具有更高的击穿强度和良好的热性能。提供了植物油与矿物油的比较分析，以证明提议的植物油的功效。与其他油相比，BSO 油在进行上述各种诊断测量测试时具有更高的击穿强度和良好的热性能。提供了植物油与矿物油的比较分析，以证明提议的植物油的功效。与其他油相比，BSO 油在进行上述各种诊断测量测试时具有更高的击穿强度和良好的热性能。