The quest for green alternative insulating oil in high-voltage equipment has been the desire of researchers for over decades. Vegetable oil has been considered as alternative insulating oil; this oil contains two different fatty acids, saturated and unsaturated. However, this fatty acid contains two opposing properties. In this work, physicochemical and dielectric properties of methyl ester from neem, yellow oleander and palm kernel oil were measured. The pour point of palm kernel oil methyl ester and the mixture of palm kernel oil methyl ester with yellow oleander methyl ester were obtained to be -9 °C and -2°, respectively. The viscosity of mineral oil is 9.5 mPas, that of palm kernel oil methyl ester, and mixture of palm kernel oil methyl ester and yellow oleander oil methyl ester were obtained to be 4.14 mPas and 4.38 mPas, respectively. A good dielectric loss relatively close to the dielectric loss of mineral oil was obtained for the mixture of palm kernel ester and yellow oleander ester. The mixture of the three methyl esters has the highest dielectric breakdown result of 26 kV better than the breakdown result of mineral oil. However, the optimization of all the parameters reveals that the mixture of palm kernel ester and yellow oleander ester has the desired property that can serve as an alternative for mineral insulating oil. Also, aging of the samples confirmed that mixture of palm kernel methyl ester and yellow oleander methyl ester has the potential to replace mineral oil.

数十年来，在高压设备中寻找绿色替代绝缘油一直是研究人员的愿望。植物油已被视为替代绝缘油；这种油含有两种不同的脂肪酸，饱和的和不饱和的。然而，这种脂肪酸包含两个相反的特性。在这项工作中，测量了印楝、黄夹竹桃和棕榈仁油中甲酯的物理化学和介电性能。得到棕榈仁油甲酯的倾点和棕榈仁油甲酯与黄夹竹桃甲酯的混合物的倾点分别为-9°C和-2°。矿物油的粘度为9.5 mPas，棕榈仁油甲酯的粘度，棕榈仁油甲酯和夹竹桃油甲酯的混合物分别为4.14 mPas和4.38 mPas。棕榈仁酯和黄夹竹桃酯的混合物获得了与矿物油的介电损耗比较接近的良好介电损耗。三种甲酯混合物的最高介电击穿结果为26 kV，优于矿物油的击穿结果。然而，所有参数的优化表明，棕榈仁酯和黄夹竹桃酯的混合物具有可作为矿物绝缘油替代品的理想性能。此外，样品的老化证实棕榈仁甲酯和黄夹竹桃甲酯的混合物具有替代矿物油的潜力。三种甲酯混合物的最高介电击穿结果为26 kV，优于矿物油的击穿结果。然而，所有参数的优化表明，棕榈仁酯和黄夹竹桃酯的混合物具有可作为矿物绝缘油替代品的理想性能。此外，样品的老化证实棕榈仁甲酯和黄夹竹桃甲酯的混合物具有替代矿物油的潜力。三种甲酯混合物的最高介电击穿结果为26 kV，优于矿物油的击穿结果。然而，所有参数的优化表明，棕榈仁酯和黄夹竹桃酯的混合物具有可作为矿物绝缘油替代品的理想性能。此外，样品的老化证实棕榈仁甲酯和黄夹竹桃甲酯的混合物具有替代矿物油的潜力。