纳米改性变压器油物性的分子动力学研究

Molecular Dynamics Research on Nano-modified Transformer Oil

为研究纳米改性后的变压器油的散热性能与绝缘性能的相容性关系,采用分子动力学方法对添加SiO 2、ZnO纳米颗粒改性后的变压器油电导率、热导率开展数值模拟实验。结果显示:添加SiO 2、ZnO纳米颗粒改性后的变压器油电导率、热导率较改性前均有所提高;改性后的变压器油电导率、热导率与模拟温度、体积分数呈非线性正相关;低体积分数时,纳米颗粒固有热导率与改性变压器油热导率不存在强关联关系;进一步研究各纳米颗粒体积分数下改性油品的散热性能和绝缘性能的相容性。在本研究范围内存在推荐值,体积分数为1%的SiO 2改性变压器油,其热导率与电导率相容性最佳。

In order to study the compatibility relationship between the heat dissipation performance and insulation performance of the nano-modified transformer oil,molecular dynamics methods were used to carry out numerical simulation experiments on the electrical conductivity and thermal conductivity of the transformer oil modified with SiO 2 and ZnO nanoparticles.The results show that the electrical conductivity and thermal conductivity of the transformer oil modified by adding SiO 2 and ZnO nanoparticles are improved compared with those before the modification;the electrical conductivity and thermal conductivity of the modified transformer oil are in non-linear positive correlation with the simulated temperature and volume fraction;when the volume fraction is low,there is no strong correlation between the intrinsic thermal conductivity of the nanoparticles and the thermal conductivity of the modified transformer oil;the compatibility of the thermal conductivity and conductivity of the modified oil under the volume fraction of each nanoparticle are further studied.The results show there is a recommended value in the scope of this study.The SiO 2 modified transformer oil with a volume fraction of 1%has the best thermal conductivity and electrical conductivity compatibility.