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采用SiO_2纳米颗粒对变压器油进行改性研究,制备了0.5%、1%、1.5%、2%4种质量浓度的SiO_2纳米改性变压器油。通过比较不同浓度SiO_2纳米改性变压器油的分散稳定性和电气理化特性,确定最佳浓度为1%,此时测得其微水含量为5.118 mg/L,击穿电压为52.05 k V,介质损耗为2.107%。利用COMSOL Multiphysics建立稳态圆筒型散热模型,分析SiO_2纳米改性变压器油的散热特性,采用稳态法和瞬态法对配制的SiO_2纳米改性变压器油的热导率进行研究,在最佳浓度下测得其热导率为0.15 W/(m·K),较纯油提高了5%以上。仿真和实验结果均表明SiO_2纳米改性变压器油具有较好的散热性能。
The SiO 2 nano-particles were used to modify the transformer oil, and the SiO 2 nano-modified transformer oil with the mass concentration of 0.5%, 1%, 1.5% and 2% was prepared. By comparing the dispersion stability and electrochemical physical and chemical properties of different concentrations of nano-SiO2 modified transformer oil, the optimal concentration was determined to be 1%. At this time, the micro-water content was 5.118 mg / L, the breakdown voltage was 52.05 kV, Loss is 2.107%. The COMSOL Multiphysics model was used to establish the steady-state cylindrical cooling model. The thermal properties of SiO 2 nano-modified transformer oil were analyzed. The thermal conductivities of the prepared SiO 2 nano-modified transformer oil were studied by steady state method and transient method. Its thermal conductivity was 0.15 W / (m · K), which was more than 5% higher than pure oil. Simulation and experimental results show that SiO 2 nano-modified transformer oil has better heat dissipation performance.