1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China
Abstract：Epoxy resin is commonly used in the manufacture of basin insulators, and its surface charge accumulation under DC voltage is a serious phenomenon, which has become a major bottleneck hindering the development and application of DC gas insulated electrical equipment. As a highly efficient and controllable modification method, plasma technology can effectively improve the electrical properties of epoxy fillers. In this paper, the micron-AlN filler was fluorinated by cold plasma technology at atmospheric pressure and different fluorination time was controlled. The morphology, chemical composition, charge characteristics and creeping flashover characteristics of the modified epoxy resin samples were tested. The experimental results show that after plasma fluorination for 45 min, the average particle size of the filler is reduced by 26%, the filler is fluorinated for 45 min, and the proportion of fluorine is 38.55%. As the fluorination time increases, the amount of initial charge accumulated in the epoxy resin decreases, and the flashover voltage first increases and then decreases. When the filler is fluorinated for 45 minutes, the flashover voltage is the most obvious, which is about 39.9% higher than that of the unfluorinated filler; and the two-parameter Weibull distribution indicates that the flashover voltage dispersion also decreases. The results show that the plasma filler treatment can improve the electrical properties of epoxy resin. The treatment method is efficient and stable, and the performance is improved obviously. It provides a new research idea for the modification of AlN and other fillers.
[1] 李鹏, 颜湘莲, 王浩, 等. 特高压交流GIL输电技术研究及应用[J]. 电网技术, 2017, 41(10): 3161-3167. Li Peng, Yan Xianglian, Wang Hao, et al.Research and application of UHVAC gas-insulated trans- mission line[J]. Power System Technology, 2017, 41(10): 3161-3167. [2] 南振乐, 李振军, 刘朋飞. 复杂地形条件下的GIL工程设计[J]. 高压电器, 2016, 52(6): 193-198. Nan Zhenle, Li Zhenjun, Liu Pengfei.Engineering design of GIL used at complex terrain[J]. High Voltage Apparatus, 2016, 52(6): 193-198. [3] 庞庆平, 郭煜敬, 金光耀. 1100kV SF6气体绝缘金属封闭输电线路关键技术[J]. 高压电器, 2017, 53(8): 34-37, 42. Pang Qingping, Guo Yujing, Jin Guangyao.Key technology of 1100kV SF6 gas-insulated metal- enclosed transmission line[J]. High Voltage Apparatus, 2017, 53(8): 34-37, 42. [4] 田浩, 李继承, 郝留成, 等. 直流电压下环氧绝缘材料电气性能对电荷积聚的影响[J]. 电网技术, 2015, 39(5): 1463-1468. Tian Hao, Li Jicheng, Hao Liucheng, et al.Influence of electrical properties of epoxy insulating materials on surface charge accumulation under DC voltage[J]. Power System Technology, 2015, 39(5): 1463-1468. [5] 唐炬, 潘成, 王邸博, 等. 高压直流绝缘材料表面电荷积聚研究进展[J]. 电工技术学报, 2017, 32(8): 10-21. Tang Ju, Pan Cheng, Wang Dibo, et al.Development of studies about surface charge accumulation on insulating material under HVDC[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 10-21. [6] Mendik M, Lowder M S, Elliott F.Long term perfor- mance verification of high voltage DC GIS[C]//IEEE Transmission and Distribution Conference, New Orleans, USA, 1999: 484-488. [7] Ohki Y.Thyristor valves and GIS in Kii Channel HVDC link[J]. IEEE Electrical Insulation Magazine, 2001: 17(3): 78-79. [8] Xie Jun, Chalmers I D.The influences of surface charge upon flash-over of particle-contaminated insulators in SF6 under impulse voltage conditions[J]. Journal of Physics D: Applied Physics, 1997, 30(7): 1055-1063. [9] 丁正方, 方志, 许靖. 四氟化碳含量对大气压Ar等离子体射流放电特性的影响[J]. 电工技术学报, 2016, 31(7): 159-165. Ding Zhengfang, Fang Zhi, Xu Jing.Influences of CF4 content on discharge characteristics of argon plasma jet under atmospheric pressure[J]. Transa- ctions of China Electrotechnical Society, 2016, 31(7): 159-165. [10] 林浩凡, 王瑞雪, 谢庆, 等. 等离子体射流快速改性促进表面电荷衰减[J]. 电工技术学报, 2017, 32(16): 256-264. Lin Haofan, Wang Ruixue, Xie Qing, et al.Rapid surface modification by plasma jet to promote surface charge decaying[J]. Transactions of China Electro- technical Society, 2017, 32(16): 256-264. [11] Du B X, Li Jie, Du Wei, et al.Dynamic behavior of surface charge on direct-fluorinated polyimide films[C]//IEEE International Conference on Solid Dielectrics (ICSD), Bologna, Italy, 2013: 329-332. [12] Shao Tao, Yang Wenjin, Zhang Cheng, et al.Enhanced surface flashover strength in vacuum of polymethy- lmethacrylate by surface modification using atmospheric- pressure dielectric barrier discharge[J]. Applied Physics Letters, 2014, 105(7): 071607. [13] 马翊洋, 章程, 孔飞, 等. 等离子体射流阵列辅助薄膜沉积对环氧树脂表面电气特性的影响[J]. 高电压技术, 2018, 44(9): 3089-3096. Ma Yiyang, Zhang Cheng, Kong Fei, et al.Effect of plasma jet array assisted film deposition on epoxy resin surface electrical characteristics[J]. High Voltage Engineering, 2018, 44(9): 3089-3096. [14] 周亦骁, 方志, 邵涛. Ar/O2和Ar/H2O中大气压等离子体射流放电特性的比较[J]. 电工技术学报, 2014, 29(11): 229-238. Zhou Yixiao, Fang Zhi, Shao Tao.Comparison of discharge characteristics of atmospheric pressure plasma jet in Ar/O2 and Ar/H2O mixtures[J]. Transactions of China Electrotechnical Society, 2014, 29(11): 229-238. [15] Lü Fangcheng, Yin Kai, Fu Kexin, et al.Enhanced magnetic and dielectric properties of Y doped bismuth ferrite nanofiber[J] Ceramics International, 2017, 43(18): 16101-16106. [16] Tanaka Y, Chen G, Zhao Y, et al.Effect of additives on morphology and space charge accumulation in low density polyethylene[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2003, 10(1): 148-154. [17] 王有元, 王施又, 陆国俊, 等. 纳米AlN改性对干式变压器环氧树脂绝缘性能的影响[J]. 电工技术学报, 2017, 21(7): 174-180. Wang Youyuan, Wang Shiyou, Lu Guojun, et al.Influence of nano-AlN modification on the insulation properties of epoxy resin of dry-type transformers[J]. Transactions of China Electrotechnical Society, 2017, 21(7): 174-180. [18] Ma Aijie, Chen Weixing, Hou Yonggang, et al.The preparation and cure kinetics researches of thermal conductivity epoxy/AlN composites[J]. Polymer- Plastics Technology and Engineering, 2010, 49(4): 354-358. [19] Hsieh Cheng-Yu, Chung Shyan-Lung.High thermal conductivity epoxy molding compound filled with a combustion synthesized AlN powder[J]. Journal of Applied Polymer Science, 2006, 102(5): 4734-4740. [20] 戴栋, 宁文军, 邵涛. 大气压低温等离子体的研究现状与发展趋势[J]. 电工技术学报, 2017, 32(20): 1-9. Dai Dong, Ning Wenjun, Shao Tao.Areview on the state of art and future trends of atmospheric pressure low temperature plasmas[J]. Transactions of China Electrotechnical Society, 2017, 32(20): 1-9. [21] Shao Xianjun, Zhang Guanjun, Zhan Jiangyang, et al.Research on surface modification of polytetra- fluoroethylene coupled with argon dielectric barrier discharge plasma jet characteristics[J]. IEEE Transactions on Plasma Science, 2011, 39(11): 3095-3102. [22] Georgieva V, Bogaerts A, Gijbels R.Numerical study of Ar/CF4/N2 discharges in single- and dual- frequency capacitively coupled plasma reactors[J]. Journal of Applied Physics, 2003, 94(6): 3748-3756. [23] 马翊洋, 章程, 孔飞, 等. 次大气压介质阻挡放电处理环氧树脂对表面电荷消散的影响及老化特性[J]. 电工技术学报, 2018, 33(22): 5168-5176. Ma Yiyang, Zhang Cheng, Kong Fei, et al.Surface treatment of epoxy resin by sub-atmospheric-pressure dielectric barrier discharge: the effect on surface charge dissipation and aging characteristics[J]. Transactions of China Electrotechnical Society, 2018, 33(22): 5168-5176. [24] Suematsu H, Nishimura S, Murai K, et al.Pulsed wire discharge apparatus for mass production of copper nanopowders[J]. Review of Scientific Instruments, 2007, 78(5): 056105. [25] Pfeiffer T V, Feng J, Schmidt-Ott A.New deve- lopments in spark production of nanoparticles[J]. Advanced Powder Technology, 2014, 25(1): 56-70. [26] 黄昊, 李水清, 唐勇, 等. 纳米金属颗粒的等离子体合成与燃烧特性[J]. 燃烧科学与技术, 2018, 24(2): 97-103. Huang Hao, Li Shuiqing, Tang Yong, et al.Plasma synthesis and combustion characteristics of nano- sized metal particles[J]. Journal of Combustion Science and Technology, 2018, 24(2): 97-103. [27] Mihály J, Sterkel S, Ortner HM, et al.FTIR and FT-Raman spectroscopic study on polymer based high pressure digestion vessels[J]. Croatica Chemica Acta, 2006, 79(3): 497-501. [28] 高宇, 门业堃, 杜伯学, 等. 表面电荷对典型聚合物绝缘材料直流闪络电压的影响[J]. 高电压技术, 2015, 41(5): 1474-1480. Gao Yu, Men Yekun, Du Boxue, et al.Effect of surface charge on DC flashover voltage of typical polymer insulating materials[J]. High Voltage Engineering, 2015, 41(5): 1474-1480. [29] Simmons J G, Tam M C.Theory of isothermal currents and the direct determination of trap parameters in semiconductors and insulators containing arbitrary trap distributions[J]. Physical Review B, 1973, 7(8): 3706-3713. [30] 杨凯, 郑楠, 张冠军, 等. 固体绝缘介质表面陷阱参数的分析[J]. 高电压技术, 2007, 33(9): 13-16. Yang Kai, Zheng Nan, Zhang Guanjun, et al.Analysis of surface trapping parameters of solid insulation dielectrics[J]. High Voltage Engineering, 2007, 33(9): 13-16. [31] 李成榕, 丁立健, 吕金壮, 等. 氧化铝陶瓷绝缘子真空沿面闪络过程中的陷阱机制[J]. 中国电机工程学报, 2007, 27(9): 1-5. Li Chengrong, Ding Lijian, Lü Jinzhuang, et al.Traping and de-traping process resulting in the alumina surface flashover in vacuum[J]. Proceedings of the CSEE, 2007, 27(9): 1-5. [32] Chen Yu, Cheng Yonghong, Wu Kai, et al.Flashover characteristic of epoxy composites filled with different micro-inorganic oxide particles under nanosecond pulse in vacuum[J]. IEEE Transactions on Plasma Science, 2009, 37(1): 195-203. [33] Yu Kaikun, Zhang Guanjun, Liu Guoqing, et al.Effect of surface shallow traps on flashover characteristics across machinable ceramic in vacuum[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2008, 15(5): 1464-1470.
2019, Vol. 34 
