【摘要】 酸性环境下的水解是变压器绝缘材料老化的重要形式之一。为给变压器材料的水解老化提供微观信息,利用分子动力学对不同水分含量的油中水合氢离子的扩散行为进行了模拟研究。对水合氢离子的扩散系数的分析表明,油中水分含量对水合氢离子的扩散产生了较大影响,随着水分含量的增加,水合氢离子的扩散系数在不断减小。水合离子与含水油介质的相互作用是影响水合氢离子扩散的最重要的因素,自由体积对其影响较小。模拟结果间接地说明了变压器绝缘材料老化时水分和酸的协同作用。更多还原

【Abstract】 Acid hydrolysis is an important form of aging of power transformer insulation materials.The diffusion behavior of hydronium ion in the hydrous oil dielectric was investigated using molecular dynamics.It is found that the diffusion of hydronium ion in oil dielectric is isotropic and greatly influenced by water.The diffusion coefficient continuously decreases with increase of water content.The interaction between hydronium ion and hydrous oil medium plays a predominant role in affecting diffusion behavior of hydronium ion,whereas the free volume comparatively less plays the role.Simulation results indirectly indicate the synergism of water and acid in accelerating the aging of power transformer insulation materials.更多还原