CAJ | 학술논문

为了从微观层次上揭示气体小分子在变压器油纸绝缘系统中的扩散机理,对变压器油纸复合绝缘材料老化过程中产生的7种常见气体小分子（包括H2、CO、CO2、CH4、C2H2、C2H4和C2H6）在油纸两相介质中的扩散行为进行了分子动力学模拟。采用分子动力学模拟软件,搭建了2组模型,以分别模拟各种气体小分子在油中和纤维素绝缘纸中的扩散。通过对气体小分子在油纸介质中扩散系数、位移特性、自由体积特性与油纸的相互作用能的研究,考察了不同气体小分子在油纸介质中扩散的微观机理,探讨了气体小分子在油纸介质中扩散特性的差异,比较了不同因素对气体小分子扩散行为的影响。研究发现：气体小分子在纤维素中的扩散系数比其在绝缘油中的扩散系数小1个数量级,且7种气体小分子在2种介质中的扩散系数的排列顺序亦不相同;在绝缘油中,主要影响气体小分子扩散行为的是自由体积;而在纤维素材料中,对气体小分子的扩散行为起主要影响的是分子间的相互作用。
위료종미관층차상게시기체소분자재변압기유지절연계통중적확산궤리,대변압기유지복합절연재료노화과정중산생적7충상견기체소분자（포괄H2、CO、CO2、CH4、C2H2、C2H4화C2H6）재유지량상개질중적확산행위진행료분자동역학모의。채용분자동역학모의연건,탑건료2조모형,이분별모의각충기체소분자재유중화섬유소절연지중적확산。통과대기체소분자재유지개질중확산계수、위이특성、자유체적특성여유지적상호작용능적연구,고찰료불동기체소분자재유지개질중확산적미관궤리,탐토료기체소분자재유지개질중확산특성적차이,비교료불동인소대기체소분자확산행위적영향。연구발현：기체소분자재섬유소중적확산계수비기재절연유중적확산계수소1개수량급,차7충기체소분자재2충개질중적확산계수적배렬순서역불상동;재절연유중,주요영향기체소분자확산행위적시자유체적;이재섬유소재료중,대기체소분자적확산행위기주요영향적시분자간적상호작용。
In order to reveal the diffusion mechanism of gas molecules in transformer oil paper insulation system on the micro level, diffusion behaviors of 7 kinds of gas molecules in oil and paper medium were simulated based on molecular dynamics, respectively. The gases includes H2, CO, CO2, CH4, C2H2, C2H4, and C2H6, which are commonly utilized in dissolved gas analysis of power transformer and produced during the aging process of oil paper composite insulating material. By using a molecular dynamics simulation software, 2 groups of models were set up to simulate the diffusion of the gas molecules in oil and paper. By investigating the diffusion coefficients, displacement features, free volume characteristics, and interaction energies of corresponding gas molecules, the diffusion micro-mechanism of the gas molecules was observed, the differences in diffusion features among the gas molecules were discussed, and the influences of impact factors on gas molecules' diffusion were contrasted. Simulation results indicate that the diffusion coefficients of gas molecule in cellulose is an order of magnitude lower than that in oil, and the order of the diffusion coefficients of these gas molecules in the 2 kinds of insulation media is different. It is concluded that, in oil, the main factor influencing the gas molecular diffusion behavior is the free volume of gas molecules, and in cellulose, this main factor is the intermolecular interaction.