为了研究酸在油纸绝缘中的扩散和溶解特性，在变压器油中分别加入乙酸和硬脂酸，至油中酸值均达到0.4 mgKOH/g，分别在80℃和110℃，绝缘纸中初始水分含量为0.5%和3.2%的条件下，测试了酸在油纸间达到平衡所需的时间及变压器油中的酸值，运用分子模拟技术分析了酸在油纸绝缘中的分布机理。结果表明：乙酸扩散速度快，易被绝缘纸吸收，硬脂酸扩散速度慢，易被变压器油吸收；温度对酸在油纸绝缘中的分布影响很小；乙酸会影响水分在油纸之间的分布，而硬脂酸基本没有影响。
To study the diffusion and solubility characteristics of acid in transformer oil-paper insulation, acetic acid and stearic acid were added into the transformer oil to the acid value reach 0.4 mgKOH/g in oil. Under condition of 80℃ and 110℃ and the initial moisture content is 0.5% and 3.2% respectively in the insulation paper, the time to reach equilibrium of acid in oil-paper insulation and the acid value in oil were tested, and the distribution mechanism of acid in oil-paper insulation was analyzed by molec-ular simulation. The results show that the diffusion rate of acetie acid is fast, and acetie acid can be eas-ily absorbed by insulation paper. The diffusion rate of stearic acid is slow, and stearic acid can be easi-ly absorbed by transformer oil. The effect of temperature on the distribution of acid in oil-paper insula-tion is very small, and acetic acid will affect the distribution of water between oil and paper, but stearic acid has nothing the effect.
参考文献
| [1] | A. M. Emsley;X. Xiao;R. J. Heywood;M. Ali .Degradation of cellulosic insulation in power transformers. part 3: effects of oxygen and water on ageing in oil[J].IEE proceedings.A.Science, measurement & technology,2000(3):115-119. |
| [2] | 王晓剑,彭倩,刘君,姚晓,周利军,陈凌.基于最小二乘法的变压器油纸绝缘频域介电谱法的研究[J].绝缘材料,2012(04):64-68,72. |
| [3] | 申翰林 .基于回复电压法的油浸式变压器状态检测关键技术的研究[D].西南交通大学,2012. |
| [4] | T. V. Oommen;Thomas A. Prevost .Cellulose Insulation in Oil-Filled Power Transformers: Part II - Maintaining Insulation Integrity and Life[J].IEEE Electrical Insulation Magazine,2006(2):5-14. |
| [5] | Lundgaard L E;Hansen W;Ingebrugtsn S.Aging of Kraft Paper by Acid Catalyed Hydrolysis[A].,2005:381-384. |
| [6] | 廖瑞金,郝建,梁帅伟,朱孟兆,杨丽君.水分和酸对矿物油与天然酯混合油-纸绝缘热老化的影响[J].电工技术学报,2010(07):31-37. |
| [7] | GB/T 7595-2008.运行中变压器油质量标准[S].北京:中国标准出版社,2008. |
| [8] | Lars E. Lundgaard;Walter Hansen;Dag Linhjell;Terence J. Painter .Aging of Oil-Impregnated Paper in Power Transformers[J].IEEE Transactions on Power Delivery,2004(1):230-239. |
| [9] | 朱孟兆 .油浸绝缘纸热老化机理的分子动力学研究[D].重庆大学,2011. |
| [10] | Diagnostic Application of Moisture Equilibrium for Power Transformers[J].IEEE Transactions on Power Delivery,2010(4):2574. |
| [11] | 朱孟兆,廖瑞金,周欣,杨丽君,孙才新.油介质中水合氢离子扩散的分子动力学模拟[J].高电压技术,2011(08):1930-1936. |
| [12] | Walter S. Zaengl .Dielectric spectroscopy in time and frequency domain for HV power equipment, Part I: Theoretical considerations[J].IEEE Electrical Insulation Magazine,2003(5):5-19. |
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