油纸复合绝缘热老化及水分影响机理的反应分子动力学模拟

doi:10.19595/j.cnki.1000-6753.tces.190315

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Abstract H High temperature and moisture are the main causes of deterioration of oil-paper insulation in transformer, which is important to analyze the degradation mechanism. Molecular models for oil-paper composite insulation were built, and thermal aging processes of insulation under different moisture contents were simulated by using reaction force field (ReaxFF). The amount of reactants and products in the aging process was monitored, and then the main reaction path of oil-paper insulation aging and interaction mechanism between oil-paper were obtained by isotope labeling method. The influence of moisture on thermal aging process of composite insulation was emphatically analyzed. The results indicate that main products of oil-paper aging are H₂, C₂H₄, CH₄, H₂O, CH₂OHCHO, HCOOH, CO₂ and CO. Hydrogen bonds are easy to form between water and cellobiose molecules under high temperature, destroying the structure of cellobiose. Besides, water and acid molecules generated by the decomposition of cellobiose can promotes deterioration of insulating oil. Oil and paper insulation aging promote each other under the influence of H⁺, which can accelerate composite insulation aging.

Key words： Oil-paper composite insulation moisture thermal aging reactive molecular dynamics reaction force field

Received: 25 March 2019 Published: 12 May 2020

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TM852

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	Articles by authors
	Li Jiacai
	Chen Jiming
	Zhu Mingxiao
	Song Henggao
	Zhang Hongyu

Cite this article:

Li Jiacai,Chen Jiming,Zhu Mingxiao等. A Reactive Molecular Dynamics Simulation of Thermal Aging Process of Oil-Paper Insulation and the Influence Mechanism of Moisture[J]. Transactions of China Electrotechnical Society, 2020, 35(9): 1999-2005.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190315 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I9/1999

[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.Review on thermal aging of oil-paper insulation in power transformer[J]. Transaction of China Electrotechnical Society, 2012, 27(5): 1-12.
[2] Wang Xiaobo, Tang Chao, Huang Bo, et al.Review of research progress on the electrical properties and modification of mineral insulating oils used in power transformers[J]. Energies, 2018(11): 487.
[3] 杨丽君, 孙栋伟, 李金忠, 等. 变压器油纸绝缘绕组过载条件下的热老化实验方法研究[J]. 电工技术学报, 2018, 33(3): 609-617.
Yang Lijun, Sun Dongwei, Li Jinzhong, et al.Investigation of thermal aging test method for transformer oil-paper insulation under over-load condition[J]. Transaction of China Electrotechnical Society, 2018, 33(3): 609-617.
[4] 李长云, 孙孟玉, 张迎春. 基于油中水分含量的变压器绝缘纸寿命评估[J]. 高电压技术, 2018, 44(8): 2541-2547.
Li Changyun, Sun Mengyu, Zhang Yingchun.Life evaluation of transformer insulation paper based on moisture content in oil[J]. High Voltage Engineering, 2018, 44(8): 2541-2547.
[5] 廖瑞金, 林元棣, 杨丽君, 等. 温度、水分、老化对变压器油中糠醛及绝缘纸老化评估的影响和修正[J]. 中国电机工程学报, 2017, 37(10): 3037-3044.
Liao Ruijin, Lin Yuandi, Yang Lijun, et al.Effects and correction of temperature, moisture and aging on furfural content in insulating oil and aging assessment of insulation paper[J]. Proceedings of the CSEE, 2017, 37(10): 3037-3044.
[6] 杨丽君, 黄加佳, 胡恩德, 等. 二苄基二硫含量对矿物绝缘油老化特性的影响[J]. 电工技术学报, 2017, 32(12): 251-258.
Yang Lijun, Huang Jiajia, Hu Ende, et al.Influence of dibenzyl disulfide content on aging characteristic of insulation oil[J]. Transaction of China Electro- technical Society, 2017, 32(12): 251-258.
[7] 丛浩熹, 舒想, 张敏昊, 等. 噻吩对变压器油纸绝缘系统热老化特性研究[J]. 电工技术学报, 2018, 33(21): 5136-5141.
Cong Haoxi, Shu Xiang, Zhang Minhao, et al.Influence of thiophene on thermal aging of the trans- former oil-paper insulation system[J]. Transaction of China Electrotechnical Society, 2018, 33(21): 5136-5141.
[8] 李庆民, 黄旭炜, 刘涛, 等. 分子模拟技术在高电压绝缘领域的应用进展[J]. 电工技术学报, 2016, 31(12): 1-13.
Li Qingmin, Huang Xuwei, Liu Tao, et al.Appli- cation progress of molecular simulation technology in high voltage insulation[J]. Transaction of China Electrotechnical Society, 2016, 31(12): 1-13.
[9] Yang Lijun, Qi Chaoliang, Wu Gaolin, et al.Mole- cular dynamics simulation of diffusion behaviour of gas molecules within oil-paper insulation system[J]. Molecular Simulation, 2013, 39(12): 12.
[10] Li Chao, Sun Qian, Lü Yuzhen.Study of water molecules state in transformer oil via FTIR spectrum and molecular dynamic simulation[C]//IEEE Inter- national Conference on Dielectric Liquids (ICDL), Manchester, UK, 2017: 1-5.
[11] 张敏昊, 丛浩熹, 舒想, 等. DBDS和十六硫醇对变压器绝缘纸协同劣化作用的微观机制研究[J]. 中国电机工程学报, 2018, 38(19): 5878-5886.
Zhang Minhao, Cong Haoxi, Shu Xiang, et al.Study on microscopic mechanism of the transformer insulating paper’s degradation under synergistic effect of DBDS and hexadecanethiol[J]. Proceedings of the CSEE, 2018, 38(19): 5878-5886.
[12] 周利军, 李会泽, 王安, 等. 纤维素老化对矿物油浸绝缘纸中水分扩散的影响[J]. 电工技术学报, 2019, 34(7): 1536-1542.
Zhou Lijun, Li Huize, Wang An, et al.Effects of cellulose ageing on moisture diffusion in paper immersed with mineral oil[J]. Transaction of China Electrotechnical Society, 2019, 34(7): 1536-1542.
[13] Zheng Mo, Wang Ze, Li Xiaoxia, et al.Initial reaction mechanisms of cellulose pyrolysis revealed by ReaxFF molecular dynamics[J]. Fuel, 2016, 177(1): 130-141.
[14] 闫江燕, 王学磊, 李庆民, 等. 绝缘纸高温裂解的分子动力学模拟研究[J]. 中国电机工程学报, 2015, 35(22): 5941-5949.
Yan Jiangyan, Wang Xuelei, Li Qingmin, et al.Study on molecular dynamics simulation of pyrolysis of insulating paper at high temperature[J]. Proceedings of the CSEE, 2015, 35(22): 5941-5949.
[15] 杜林, 王五静, 张彼德, 等. 基于ReaxFF场的矿物绝缘油热解分子动力学模拟[J]. 高电压技术, 2018, 44(2): 488-497.
Du Lin, Wang Wujing, Zhang Bide, et al.Molecular dynamics simulation of pyrolysis of mineral insulating oil based on the field of ReaxFF[J]. High Voltage Engineering, 2018, 44(2): 488-497.
[16] Wang Wei, Dong Wenyan, Jiang Da, et al.Water molecules migration at oil paper interface under the coupling fields of electric and temperature: a molecular dynamics study[J]. Molecular Physics, 2019, 117(1): 11-22.
[17] Mazeau K, Heux L.Molecular dynamics simulations of bulk native crystalline and amorphous structures of cellulose[J]. Journal of Physical Chemistry B, 2008, 107(10): 2394-2403.
[18] Ding Junxia, Zhang Liang, Zhang Yan, et al.A reactive molecular dynamics study of n-heptane pyrolysis at high temperature[J]. Journal of Physical Chemistry A, 2013, 117(16): 3266-3278.