Abstract Furfural analysis for transformer aging estimation will be influenced by temperature or oil replacement. The establishment of relevant correction methods should take furfural diffusion process into consideration. In this paper, according to the accelerated thermal aging tests, furfural diffusion process under 4 different temperatures and 4 different aging stages was investigated. Based on the Fick’s second law, furfural diffusion coefficients under different temperatures and aging stages were calculated, and then the furfural dynamic diffusion model was constructed which was verified by experimental data. Results showed that furfural diffusion was influenced by temperature and aging condition. The higher temperature is or the deeper aging condition is, the faster furfural diffused and the easier the equilibrium state achieved. A calculation method of furfural diffusion equilibrium time for field transformers was provided. The testing of furfural will be reliable after furfural diffusion reaching the equilibrium state.
Lin Yuandi,Yang Lijun,Liao Ruijin等. Furfural Dynamic Diffusion Process in Oil-Paper Insulation System[J]. Transactions of China Electrotechnical Society, 2017, 32(12): 241-250.
[1] 廖瑞金, 杨丽君, 郑含博, 等. 电力变压器油纸绝缘热老化研究综述[J]. 电工技术学报, 2012, 27(5): 1-12. Liao Ruijin, Yang Lijun, Zheng Hanbo, et al. Reviews on oil-paper insulation thermal aging in power transformers[J]. Transactions of China Electro- technical Society, 2012, 27(5): 1-12. [2] Kachler A, Höhlein I. Aging of cellulose at trans- former service temperatures. Part 1: influence of type of oil and air on the degree of polymerization of pressboard, dissolved gases, and furanic compounds in oil[J]. IEEE Electrical Insulation Magazine, 2005, 21(2): 15-21. [3] 余文辉, 王沾, 曾祥君, 等. 基于贝叶斯网络的多状态变压器可靠性跟踪分析[J]. 电力系统保护与控制, 2015, 43(6): 78-85. Yu Wenhui, Wang Zhan, Zeng Xiangjun, et al. Reliability tracing analysis for multi-state power transformers using Bayesian network[J]. Power System Protection and Control, 2015, 43(6): 78-85. [4] 林元棣, 廖瑞金, 夏桓桓, 等. 油纸绝缘微水二次扩散过渡过程的分析[J]. 电工技术学报, 2016, 31(10): 16-25. Lin Yuandi, Liao Ruijin, Xia Huanhuan, et al. Analysis of transition process during secondary diffusion of moisture in oil-paper insulation[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 16-25. [5] 马志钦, 廖瑞金, 郝建, 等. 温度对油纸绝缘极化去极化电流的影响[J]. 电工技术学报, 2014, 29(4): 290-297. Ma Zhiqin, Liao Ruijin, Hao Jian, et al. Influence of temperature on polarization and depolarization current of oil-paper insulation[J]. Transactions of China Electrotechnical Society, 2014, 29(4): 290-297. [6] 廖瑞金, 王季宇, 袁媛, 等. 换流变压器下新型纤维素绝缘纸特性综述[J]. 电工技术学报, 2016, 31(10): 1-15. Liao Ruijin, Wang Jiyu, Yuan Yuan, et al. Review on the characteristic of new cellulose insulation paper used in the converter transformer[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 1-15. [7] Emsley A, Stevens G. Review of chemical indicators of degradation of cellulosic electrical paper insu- lation in oil-filled transformers[J]. IEE Proceedings- Science, Measurement and Technology, 1994, 141(5): 323-334. [8] Emsley A, Xiao X, Heywood R, et al. Degradation of cellulosic insulation in power transformers. Part 2: formation of furan products in insulating oil[J]. IEE Proceedings-Science, Measurement and Technology, 2000, 147(3): 110-114. [9] Abu-Siada A, Lai S, Islam S. A novel fuzzy-logic approach for furan estimation in transformer oil[J]. IEEE Transactions on Power Delivery, 2012, 27(2): 469-474. [10] Stebbins R, Myers D, Shkolnik A. Furanic com- pounds in dielectric liquid samples: review and update of diagnostic interpretation and estimation of insulation ageing[C]//IEEE Proceedings of the 7th International Conference on Properties and Appli- cations of Dielectric Materials, Nagoya, 2003: 921- 926. [11] Unsworth J, Mitchell F. Degradation of electrical insulating paper monitored with high performance liquid chromatography[J]. IEEE Transactions on Electrical Insulation, 1990, 25(4): 737-746. [12] Pradhan M. Assessment of the status of insulation during thermal stress accelerated experiments on transformer prototypes[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2006, 13(1): 227-237. [13] Feng D, Wang Z, Jarman P. Transmission power transformer assessment using furan measurement with the aid of thermal model[C]//IEEE International Conference on Condition Monitoring and Diagnosis, Bali, 2012: 521-524. [14] Saha T. Review of modern diagnostic techniques for assessing insulation condition in aged transformers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2003, 10(5): 903-917. [15] Shang Y, Yang L, Guo Z, et al. Assessing aging of large transformers by furfural investigation[C]//IEEE Proceedings of the 7th International Conference on Solid Dielectrics, Eindhoven, 2001: 272-274. [16] Pablo A, Pahlavanpour B. Furanic compounds analysis: a tool for predictive maintenance of oil- filled electrical equipment[J]. Electra, 1997, 175: 9-18. [17] Jalbert J, Lessard M, Ryadi M. Cellulose chemical markers in transformer oil insulation. Part 1: tem- perature correction factors[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2013, 20(6): 2287-2291. [18] Pahlavanpour P, Martins M. Insulating paper ageing and furfural formation[C]//IEEE Proceedings of Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Technology Conference, Indianapolis, 2003: 283-288. [19] Lelekakis N, Guo W, Martin D, et al. A field study of aging in paper-oil insulation systems[J]. IEEE Elec- trical Insulation Magazine, 2012, 28(1): 12-19. [20] García B, Burgos J, Alonso Á. A moisture-in-oil model for power transformer monitoring-part I: theoretical foundation[J]. IEEE Transactions on Power Delivery, 2005, 20(2): 1417-1422. [21] 向彬, 廖瑞金, 杨丽君, 等. 变压器矿物油中糠醛的稳定性研究[J]. 高电压技术, 2007, 33(8): 85-87. Xiang Bin, Liao Ruijin, Yang Lijun, et al. Stability of furfural dissolved in transformer mineral oil[J]. High Voltage Engineering, 2007, 33(8): 85-87.
2017, Vol. 32 
