Fabrication of the Micro/Nano-Structure Al2O3/PTFE Composite Functional Film on the Surface of Insulation Pressboard and Its Effect on Space Charge Injection
Li Yanqing, Hao Jian, Liu Cong, Liao Ruijin, Yang Lijun
State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China
Abstract：The suppression of space charge injection and accumulation is of great significance for improving the stability of the oil-paper insulation system in converter transformer. The conventional method of decreasing the space charge amount is to modify the materials by nano doping. However, its modification effect is limited by the degree of nano particles. Surface modification has the advantages of simple craft and good reproducibility, and it can add some new property to the material without affecting other bulk properties. This paper successfully fabricated a micro/nano-structure Al2O3/PTFE composite functional film on the surface of the insulation pressboard using ratio frequency magnetron sputtering. The chemical composition and micro morphology were detected. Then the characteristic of space charge, DC breakdown and trap level distribution were analyzed by a comparative method. The results show that, the prepared functional film exists on the surface of the insulation pressboard in a form of micro/nano structure. The functional film can effectively suppress the space charge injection, thereby promoting the DC breakdown voltage. Compared to the untreated pressboard, the total charge amount decreases by 40% under the electric field strength of 15kV/mm, and the distortion of the electric field drops from 33.33% to 6.7%. The DC breakdown promotion of the pressboard increases by 5.3% for the direct breakdown test and 15% for the pre-stress test. The results of the thermal stimulated depolarization current (TSDC) test indicate that the introduction of numerous deep traps is the key factor to explain the space charge mitigation and the increase of DC breakdown voltage.
李彦青, 郝建, 刘丛, 廖瑞金, 杨丽君. 绝缘纸板表面微纳Al2O3/PTFE复合功能层制备及其对空间电荷注入的影响[J]. 电工技术学报, 2020, 35(18): 3960-3971.
Li Yanqing, Hao Jian, Liu Cong, Liao Ruijin, Yang Lijun. Fabrication of the Micro/Nano-Structure Al2O3/PTFE Composite Functional Film on the Surface of Insulation Pressboard and Its Effect on Space Charge Injection. Transactions of China Electrotechnical Society, 2020, 35(18): 3960-3971.
[1] 齐波, 魏振, 李成榕, 等. 交直流复合电场中油纸绝缘沿面放电现象及特征[J]. 电工技术学报, 2016, 31(10): 59-67. Qi Bo, Wei Zhen, Li Chengrong, et al.The phenomena and characteristics of oil-paper insulation surface discharge under AC and DC voltage[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 59-67. [2] 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 transformers[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 1-15. [3] 杜伯学, 朱闻博, 李进, 等. 换流变压器阀侧套管油纸绝缘研究现状[J]. 电工技术学报, 2019, 34(6): 1300-1309. Du Boxue, Zhu Wenbo, Li Jin, et al.Research status of oil-paper insulation for valve side bushing of converter transformer[J]. Transactions of China Elec- trotechnical Society, 2019, 34(6): 1300-1309. [4] 唐超. 油纸绝缘介质的直流空间电荷特性研究[D]. 重庆: 重庆大学, 2010. [5] 郝建. 变压器油纸绝缘热老化的时频域介电和空间电荷特性研究[D]. 重庆: 重庆大学, 2012. [6] 王云杉, 周远翔, 李光范, 等. 油纸绝缘介质的空间电荷积聚与消散特性[J]. 高电压技术, 2008, 34(5): 873-877. Wang Yunshan, Zhou Yuanxiang, Li Guangfan, et al.Space charge phenomena in oil-paper insulation materials under high voltage direct current[J]. High Voltage Technology, 2008, 34(5): 873-877. [7] 周远翔, 田冀焕, 王云杉, 等. 变压器油纸绝缘系统中的空间电荷现象[J]. 高电压技术, 2011, 37(3): 520-527. Zhou Yuanxiang, Tian Jihuan, Wang Yunshan, et al.Space charge phenomena of oil-paper insulation system in transformer[J]. High Voltage Technology, 2011, 37(3): 520-527. [8] Morshuis P, Jeroense M.Space charge measurements on impregnated paper: a review of the PEA method and a discussion of results[J]. IEEE Electrical Insulation Magazine, 1997, 13(3): 26-35. [9] 周远翔, 黄猛, 陈维江, 等. 直流电压下多层油纸绝缘介质的界面空间电荷特性[J]. 高电压技术, 2013, 39(6): 1304-1311. Zhou Yuanxiang, Huang Meng, Chen Weijiang, et al.Interface space charge characteristics in multi-layer oil-paper insulation under DC voltage[J]. High Voltage Technology, 2013, 39(6): 1304-1311. [10] 吴锴, 朱庆东, 王浩森, 等. 温度梯度下双层油纸绝缘系统的空间电荷分布特性[J]. 高电压技术, 2012, 38(9): 2366-2372. Wu Kai, Zhu Qingdong, Wang Haosen, et al.Space charge distribution characteristics in double-layer oil impregnated papers under temperature gradient[J]. High Voltage Technology, 2012, 38(9): 2366-2372. [11] 周远翔, 戴超, 黄猛, 等. 热老化过程中老化温度对油纸绝缘空间电荷特性的影响[J]. 高电压技术, 2016, 42(3): 868-875. Zhou Yuanxiang, Dai Chao, Huang Meng, et al.Effect of aging temperature on space charge characteristics in process of thermal aging[J]. High Voltage Technology, 2016, 42(3): 865-875. [12] Huang Jianwen, Zhou Yuanxiang, Zhang Ling, et al.Study on the electrical properties of nanopaper made from nanofibrillated cellulose for application in power equipment[J]. Cellulose, 2018(3): 1-10. [13] Liu Heqian, Chen Qingguo, Zhuge Xiangli, et al.Analysis of the dielectric and breakdown characteri- stic of Nano MMT modified insulation pressboard[C]// IEEE International Forum on Strategic Technology, Cox’s Bazar, 2014: 448-451. [14] 刘贺千, 池明赫, 陈庆国, 等. 纳米氧化铝改性绝缘纸板的介电特性分析[J]. 中国电机工程学报, 2017, 37(14): 4246-4253. Liu Heqian, Chi Minghe, Chen Qingguo, et al.Analysis of dielectric characteristics of Nano-Al2O3 modified insulation pressboard[J]. Proceedings of the CSEE, 2017, 37(14): 4246-4253. [15] 廖瑞金, 柳海滨, 柏舸, 等. 纳米SiO2/芳纶绝缘纸复合材料的空间电荷特性和介电性能[J]. 电工技术学报, 2016, 31(12): 40-48. Liao Ruijin, Liu Haibin, Bai Ke, et al.Space charge characteristics and dielectric properties of Nano- SiO2/Aramid paper composite[J]. Transactions of China Electrotechnical Society, 2016, 31(12): 40-48. [16] 吕程, 廖瑞金, 吴伟强, 等. 纳米TiO2对油纸绝缘介质直流空间电荷特性的影响[J]. 高电压技术, 2015, 41(2): 417-423. Lü Cheng, Liao Ruijin, Wu Weiqiang, et al.Influence of nano-TiO2 on DC space charge characteristic of oil-paper insulation material[J]. High Voltage Tech- nology, 2015, 41(2): 417-429. [17] 李晓龙. 特高压换流变压器阀侧套管油浸绝缘纸表面电荷积聚与击穿机理研究[D]. 天津: 天津大学, 2017. [18] 高晓菊, 王伯芊, 贾平斌, 等. 功能梯度材料的制备技术及其研发现状[J]. 材料导报, 2014, 28(1): 31-36. Gao Xiaoju, Wang Boqian, Jia Pingbin, et al.Preparation technology and latest development of functionally gradient materials[J]. Materials Review, 2014, 28(1): 31-36. [19] 雷清泉, 李盛涛. 关于工程电介质中几个经常涉及的问题与思考[J]. 高电压技术, 2015, 41(8): 2473-2480. Lei Qingquan, Li Shengtao.Several important issues and thinking about engineering dielectrics[J]. High Voltage Engineering, 2015, 41(8): 2473-2480. [20] 郑伟涛. 功能层材料与功能层技术[M]. 北京: 化学工业出版社, 2008. [21] Milliere L, Makasheva K, Laurent C, et al.Silver nanoparticles as a key feature of a plasma polymer composite layer in mitigation of charge injection into polyethylene under DC stress[J]. Journal of Physics D: Applied Physics, 2016, 49(1): 015304. [22] Hao Jian, Li Yanqing, Liao Ruijin, et al.Fabrication of Al2O3 Nano-structure functional film on a cellulose insulation polymer surface and its space charge suppression effect[J]. Polymers, 2017, 9(10): 502-521. [23] Hao Jian, Liu Cong, Li Yanqing, et al.Preparation nano-structure polytetrafluoroethylene (PTFE) fun- ctional film on the cellulose insulation polymerand its effect on the breakdown voltage and hydro- phobicity properties[J]. Materials, 2018, 11(5): 851-866. [24] 曾幸荣. 高分子近代测试分析技术[M]. 广州: 华南理工大学出版社, 2009. [25] Tripathi S, Haque S M, Rao K D, et al.Investigation of optical and microstructural properties of RF magnetron sputtered PTFE films for hydrophobic applications[J]. Applied Surface Science, 2016, 385: 289-298. [26] Li Shengtao, Min Daomin, Wang Weiwang, et al.Linking traps to dielectric breakdown through charge dynamics for polymer nanocomposites[J]. IEEE Transactions on Dielectrics & Electrical Insulation, 2016, 23(5): 2777-2785. [27] 王霞, 陈少卿, 成霞, 等. 电声脉冲法测量聚合物绝缘表面陷阱能级分布[J]. 中国电机工程学报, 2009, 29(1): 127-132. Wang Xia, Chen Shaoqing, Cheng Xia, et al.Measure energy distribution of surface trap in polymer insulation by PEA method[J]. Proceedings of the CSEE, 2009, 29(1): 127-132. [28] Mazzanti G, Montanari G C, Palmieri F, et al.Apparent trap-controlled mobility evaluation in insu- lating polymers through depolarization characteristics derived by space charge measurements[J]. Journal of Applied Physics, 2003, 94(9): 5997. [29] 高宇, 王小芳, 李楠, 等. 聚合物绝缘材料载流子陷阱的表征方法及陷阱对绝缘击穿影响的研究进展[J]. 高电压技术, 2019, 45(7): 2219-2230. Gao Yu, Wang Xiaofang, Li Nan, et al.Characteri- zation method for carrier trap and the effect on insulation breakdown within polymer insulating materials: a review[J]. High Voltage Engineering, 2019, 45(7): 2219-2230. [30] 田付强, 卜文斌, 杨春, 等. TSC测量技术中存在的若干问题的探讨[J]. 电工技术学报, 2010, 25(11): 21-28. Tian Fuqiang, Bu Wengbin, Yang Chun, et al.Investigation of existing problems in thermally stimulated current measurement technique[J]. Transa- ctions of China Electrotechnical Society, 2010, 25(11): 21-28. [31] Tian Fuqiang, Bu Wenbin, Shi Linshuang, et al.Theory of modified thermally stimulated current and direct determination of trap level distribution[J]. Journal of Electrostatics, 2011, 69(1): 7-10. [32] Wang Weiwang, Min Daomin, Li Shengtao.Under- standing the conduction and breakdown properties of polyethylene nanodielectrics: effect of deep traps[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23(1): 564-572.
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