乌桕籽绝缘油的电气性能及其热老化特性研究

Study on electrical properties of sapium sebiferum seed insulating oil and its thermal ageing properties

为研究乌桕籽油作为变压器用天然酯绝缘油的可行性,将乌桕籽油经过脱胶、脱酸、脱色和脱水等精炼处理后得到乌桕籽绝缘油,将其与矿物绝缘油进行理化性能和电气性能对比,并在130℃条件下进行加速热老化试验,研究其热老化特性。结果表明:乌桕籽绝缘油主要的脂肪酸成分为多不饱和脂肪酸,其理化性能和电气性能符合相关标准要求,其运动黏度和介质损耗因数大于矿物绝缘油,但燃点远高于矿物绝缘油;在130℃下经过250、500、750、1 000 h热老化后,乌桕籽绝缘油的颜色变化程度小于矿物绝缘油,且拥有高于矿物绝缘油的击穿电压,但是介质损耗因数的增幅较大。

In order to study the feasibility of using sapium sebiferum seed oil as the natural ester insulating oil for transformers,sapium sebiferum seed oil was subjected to refining treatments including degumming,deacidification,decolorization,and dehydration,to prepare a sapium sebiferum seed insulating oil.Its physicochemical and electrical properties were compared with those of mineral insulating oil,and accelerated thermal ageing test was carried out on it under 130℃to study its thermal ageing characteristic.The results show that the main fatty acid component of sapium sebiferum seed insulating oil is polyunsaturated fatty acid,its physicochemical and electrical properties can meet the requirements of relevant standards,and its kinematic viscosity and dielectric loss factor are greater than those of mineral insulating oil,but the ignition point is much higher than that of mineral insulating oil.After thermal ageing at 130℃for 250 h,500 h,750 h,and 1000 h,the sapium sebiferum seed insulating oil has less color change and higher breakdown voltage than mineral insulating oil,but its increase amplitude of dielectric loss factor is great.