【摘要】 为提升电力变压器绝缘纸的热稳定性,使用纳米Al2O3对绝缘纸进行改性,通过分子模拟和试验的方法研究了纳米Al2O3对绝缘纸纤维素热稳定性的提升效果,并分析了纳米Al2O3对绝缘纸纤维素的改性机理.首先,对纳米Al2O3与纤维素的表面相互作用机理的分析表明纳米Al2O3易于掺杂到纤维素绝缘纸中,得到了Al2O3与纤维素表面相互作用结合能的公式,揭示了公式中相关参数的物理意义.然后,使用半径为5?的纳米Al2O3对纤维素进行改性,通过分子模拟技术研究了经纳米改性后的纤维素的微观参数的变化规律;同时,对改性绝缘纸和未改性绝缘纸进行了宏观热老化试验.模拟与试验结果对比分析表明,经纳米Al2O3改性的绝缘纸纤维素热稳定性有较好的提升.最后,对纳米Al2O3改性绝缘纸纤维素的机理进行了较为深入地分析,为纳米改性变压器绝缘纸性能方面的研究提供了理论支撑.更多还原

【Abstract】 In this paper, nano Al2O3 was used as a modifier in order to improve the thermal stability of cellulose insulation paper which used in power transformer. The influence and mechanism of nano Al2O3 to the thermal stability of cellulose insulation paper were investigated by molecular simulation and experiment methods. First of all, the mechanism analysis on the surface interaction between of nano Al2O3 and cellulose indicated the easy-doping ability of nano Al2O3 to cellulose, the equation for the binding energy of surface interaction was obtained and the physical meanings of parameters in the equation were revealed. Then, nano Al2O3 with a radius of 5 ? was used to modify cellulose in MS software, the variation laws of microscopic parameters were discussed. Meanwhile, thermal ageing experiment on both modified and un-modified cellulose insulation paper was performed in laboratory. The combined analysis showed that, the thermal stability of modified cellulose insulation paper improved a lot. Finally, a deep discussion on the modification mechanism of nano Al2O3 to the thermal stability of cellulose insulation paper were presented, which introduced a theoretical reference for the future research on nano-modification technology of insulation paper.更多还原