CAJ | 학술논문

糠醛是电力变压器绝缘纸的老化产物,通过监测油中糠醛质量浓度可以直接评估绝缘纸的老化程度,但关于糠醛的生成机制及在油纸复合绝缘系统的分布规律至今没有形成统一的认识。在众多的因素中,水分被认为在影响糠醛的生成速率及其在油纸复合绝缘系统分布的过程中具有重要作用,但其作用机制却不够明晰。为此,利用分子模拟手段分别构建出糠醛分子在无水、水与油之质量比分别为1%、3%和5%的环烷基矿物绝缘油中的扩散模型并进行动力学仿真和分析。通过考察糠醛与含水油介质的相互作用、氢键成键特性以及糠醛的扩散现象,研究了水分影响糠醛在环烷基矿物绝缘油中扩散及分布规律的微观机制。研究结果表明,油中水分可以提升矿物油对于糠醛的吸附能力并增加糠醛在油中的溶解度,进而改变糠醛在油纸复合绝缘系统中的分布比例;同时油中水分抑制了糠醛的自由扩散,这将对糠醛在油中的均匀分布产生负面影响。
강철시전력변압기절연지적노화산물,통과감측유중강철질량농도가이직접평고절연지적노화정도,단관우강철적생성궤제급재유지복합절연계통적분포규률지금몰유형성통일적인식。재음다적인소중,수분피인위재영향강철적생성속솔급기재유지복합절연계통분포적과정중구유중요작용,단기작용궤제각불구명석。위차,이용분자모의수단분별구건출강철분자재무수、수여유지질량비분별위1%、3%화5%적배완기광물절연유중적확산모형병진행동역학방진화분석。통과고찰강철여함수유개질적상호작용、경건성건특성이급강철적확산현상,연구료수분영향강철재배완기광물절연유중확산급분포규률적미관궤제。연구결과표명,유중수분가이제승광물유대우강철적흡부능력병증가강철재유중적용해도,진이개변강철재유지복합절연계통중적분포비례;동시유중수분억제료강철적자유확산,저장대강철재유중적균균분포산생부면영향。
Furfural is an aging by-product of power transformer insulation paper.The concentration of furfural can be directly used as a tool to evaluate the aging extent of insulation paper.However,no universally acknowledged production mechanisms and distribution laws of furfural in oil-paper system have been obtained.Among various influential factors,water is considered to play an important but ambiguous role in effecting furfural＇s production rate and distribution.Therefore,four naphthenic mineral oil models,of which the water contents were set to 0%,1%,3% and 5% respectively,were constructed by means of molecular modeling.Molecular dynamics were performed on the models subsequently.By investigating interactions between furfural and ambient media,hydrogen bonding and diffusion phenomenon of furfural in oil,the microscopic mechanism of water influencing the diffusion and distribution characteristics of furfural in oil-paper composite system was revealed.Research results show water in transformer oil would significantly enhance oil＇s ability in absorbing furfural and improve solubility of furfural in oil as well.Moreover,water in transformer oil suppresses the free diffusion of furfural in oil which will exert native influence on furfural＇s homogeneous distribution in oil.