In this work,the mineral transformer oil was modified by CeO2-Al2O3 composite nanoparticles.The insulation and thermal conductivity of the transformer oil modified respectively by CeO2/Al2O3 and pure Al2O3 are compared.It is found that the properties of the modified transformer oil are improved by CeO2 doping.The CeO2/Al2O3 modified transformer oil was optimized,and five kinds of composite nano-particle modified transformer oil with CeO2 mass concentration of 0.3％,0.6％,0.9％,1.2％and 1.5％were prepared.The optimal dispersion concentration of composite nanoparticles was determined to be 0.9％after comparing various performance indexes of the oil products.The breakdown voltage,the moisture content and the dielectric loss factor of the composite nano-modified transformer oil with 0.9％dispersion are 63.9 kV,5.49 mg·L-1 and 0.971％,respectively.The thermal conductivity is 0.132W·(m·K)-1,which is about 17％higher than that of pure oil.
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