Abstract:The compatibility between gas and solid insulating materials in gas insulated transmission lines (GIL) is defined as follows: the changes of insulation performance caused by long-term contact between the two materials and the changes of gas composition and solid material. As an environmental-friendly insulating gas with potentiality to replace SF6, the compatibility between C3F7CN/CO2 and epoxy resin used in GIL needs to be studied urgently to avoid insulation failure of equipment. The authors proposed the method for evaluating the compatibility and set up a gas-solid compatibility test platform in this paper. Thermal acceleration tests of C3F7CN/CO2 and epoxy resin are carried out at different temperatures. Also, the control groups of SF6 and He gas were set to distinguish the influence of temperature. Dielectric loss, surface flashover voltages, surface morphology of epoxy resin and gas composition before and after the tests were compared. A small amount of C3F6 and trimer of C3F7CN were found after testing at 160℃ and the surface insulation properties of epoxy resins did not deteriorate. Tests results shows the compatibility between C3F7CN/CO2 and epoxy resin is as good as the compatibility between SF6 and epoxy resin under normal operation of GIL.
袁瑞君, 李涵, 郑哲宇, 周文俊, 叶三排. 气体绝缘输电线路用C3F7CN/CO2混合气体与环氧树脂相容性试验[J]. 电工技术学报, 2020, 35(1): 70-79.
Yuan Ruijun, Li Han, Zheng Zheyu, Zhou Wenjun, Ye Sanpai. Experiment on the Compatibility between C3F7CN/CO2 Gas Mixture and Epoxy Resin Used in Gas Insulated Transmission Line. Transactions of China Electrotechnical Society, 2020, 35(1): 70-79.
[1] 唐念, 乔胜亚, 李丽, 等. HF 和H2S 作为气体绝缘组合电器绝缘缺陷诊断特征气体的有效性[J]. 电工技术学报, 2017, 32(19): 202-211. Tang Nian, Qiao Shengya, Li Li, et al.Validity of HF and H2S as target gases of insulation monitoring in gas insulated switchgear[J]. Transactions of China Electrotechnical Society, 2017, 32(19): 202-211. [2] 赵明月, 韩冬, 荣文奇, 等. 电晕放电下全氟异丁腈(C4F7N)与空气混合气体的分解产物规律及其形成原因分析[J]. 高电压技术, 2018, 44(10): 3174-3182. Zhao Mingyue, Han Dong, Rong Wenqi, et al.Analysis of decomposition by-products and its formation mechanism of C4F7N/air mixed gases under AC corona discharge[J]. High Voltage Engineering, 2018, 44(10): 3174-3182. [3] Kieffel Y.Characteristics ofalternative to SF6)[C]// 2016 IEEE International Conference on Dielectrics (ICD), Montpellier, France, 2016, 2: 880-884. [4] 颜湘莲, 高克利, 郑宇, 等. SF6 混合气体及替代气体研究进展[J]. 电网技术, 2018, 42(6): 1837-1844. Yan Xianglian, Gao Keli, Zheng Yu, et al.Progress of gas mixture and alternative gas of SF6[J]. Power System Technology, 2018, 42(6): 1837-1844. [5] Nechmi H E, Beroual A, Girodet A, et al.Fluoronitriles/CO2 gas mixture as promising substitute to SF6 for insulation in high voltage applications[J]. IEEE Transactions on Dielectrics & Electrical Insulation, 2016, 23(5): 2587-2593. [6] Wada J, Ueta G, Okabe S.Dielectric properties of gas mixtures with per-fluorocarbon gas and gas with low liquefaction temperature[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2016, 23(2): 838-847. [7] 周文俊, 郑宇, 高克利, 等. 环保型绝缘气体电气特性研究进展[J]. 高电压技术, 2018, 44(10): 3114-3124. Zhou Wenjun, Zheng Yu, Gao Keli, et al.Progress in re-searching electrical characteristics of environment-friendly insulating gases[J]. High Voltage Engineering, 2018, 44(10): 3114-3124. [8] 王凌志, 周文俊, 张天然, 等. C4F7N/CO2混合气体在均匀和极不均匀电场下的工频绝缘性能[J]. 高电压技术, 2019, 45(4): 1101-1107. Wang Lingzhi, Zhou Wenjun, Zhang Tianran, et al.Power frequency insulation experiments of C4F7N/CO2 mixture under uniform and extremely non-uniform electric field[J]. High Voltage Engineering, 2019, 45(4): 1101-1107. [9] Kessler F, Sarfert-Gast W, Ise M, et al.Interaction of low global warming potential gaseous dielectrics with materials of gas-insulated systems[C]//The 20th international Symposium on High Voltage Engineering, Buenos Aires, 2017. [10] Zhang Xiaoxing, Li Yi, Chen Dachang, et al.Dissociative adsorption of environment-friendly insulating medium C3F7CN on Cu(111) and Al(111) surface: a theoretical evaluation[J]. Applied Surface Science, 2018, 434: 549-560. [11] Li Yi, Zhang Xiaoxing, Xiao Song, et al.Insights into the interaction between C4F7N decomposition products and Cu (111), Ag (111) surface[J]. Journal of Fluorine Chemistry, 2018, 213: 24-30. [12] Kieffel Y, Berteloot T, Souchal S, et al.Characteristics of g3-an alternative to SF6[C]// Study Committees A3, B4 & D1. Winnipeg, Canada: CIGRE, 2017, DOI: 10.1109/ICD. 2016.7547757. [13] 郑哲宇, 李涵, 周文俊, 等. 环保绝缘气体C3F7CN与密封材料三元乙丙橡胶的相容性研究[J/OL]. 高电压技术, 2019, https//doi.org/10.13336/j.1003-6520.hve. 20190513015 Zheng Zheyu, Li Han, Zhou Wenjun, et. al. Compatibility of eco-friendly insulating medium C3F7CN and sealing material EPDM[J/OL]. High Voltage Engineering, 2019, https//doi.org/10.13336/j. 1003-6520.hve.20190513015. [14] 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, 32(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, 32(7): 174-180. [15] 杨丽君, 孙伟栋, 李金忠, 等. 变压器油纸绝缘绕组过载条件下的热老化试验方法研究[J]. 电工技术学报, 2018, 33(3): 1-8. Yang Lijun, Sun Weidong, Li Jinzhong, et al.Investigation of thermal aging test method for transformer oil-paper insulation under over-load condition[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 1-8. [16] 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 Engineering, 2016, 42(3): 868-875. [17] 周宏扬, 马国明, 刘姝嫔, 等. 基于电-热多物理场耦合模型的直流GIL 绝缘子表面电荷积聚及其对沿面电场影响的研究[J]. 中国电机工程学报, 2017, 37(4): 1251-1259. Zhou Hongyang, Ma Guoming, Liu Shupin, et al.Study on surface charges accumulation on insulator and its effects on the surface electrical field in DC-GIL with electro-thermal coupling model[J]. Proceedings of the CSEE, 2017, 37(4): 1251-1259. [18] 俞翔霄, 俞赞琪, 陆惠英. 环氧树脂电绝缘材料[M]. 北京: 化学工业出版社, 2006. [19] 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, 3(1): 1-8. Cong Haoxi, Shu Xiang, Zhang Minhao, et al.Influence of thiophene on thermal aging of thetransformer oil-paper insulation system[J]. Transactions of China Electrotechnical Society, 2018, 33(1):1-8. [20] Kieffel Y, Biquez F, Ponchon P.Alternative gas to SF6 for use in high voltage switchgears:g3[C] //23rd International Conference Electrical Distribution, Lyon, France: 2015: 0230(5). [21] 李志闯, 丁卫东, 高克利, 等. C4F7N/CO2混合气体中环氧绝缘子雷电冲击沿面绝缘特性[J]. 高电压技术, 2019, 45(4): 1071-1077. Li Zhichuang, Ding Weidong, Gao Keli, et al.Surface flashover characteristics of epoxy insulator in C4F7N/CO2 mixtures under lightening impulse voltage[J]. High Voltage Engineering, 2019, 45(4):1071-1077. [22] 李长明. 高分子绝缘材料化学基础[M]. 哈尔滨: 哈尔滨工业大学出版社, 2007. [23] 赫曼科赫. 气体绝缘输电线路[M]. 北京: 机械工业出版社, 2016. [24] 严璋, 朱德恒. 高电压绝缘技术[M]. 北京: 中国电力出版社, 2016. [25] 黄红英, 尹齐和. 傅里叶变换衰减全反射红外光谱法(ATR-FTIR)的原理与应用进展[J]. 中山大学研究生学刊: 自然科学. 医学版, 2011(1): 20-31. Huang Hongying, Yin Qihe.Fundamentals and application advances in attenuated total internal reflectance Fourier transform infrared spectroscopy (ATR-FTIR)[J]. Journal of the Graduates Sun Yat-Sen University: Natural Sciences. Medicine, 2011(1): 20-31. [26] Kremer F, Schonhals A.Broadband dielectric spectroscopy[M]. Berlin Heidelberg: Springer-Verlag, 2003. [27] Huang Yin, Min Daomin, Li Shengtao, et al.Dielectric relaxation and carrier transport in epoxyresin and its microcomposite[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2017, 24(5): 3083-3091. [28] 马翊翔, 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): 5168-5177. Ma Yixiang, 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): 5168-5177. [29] Castellon J, Nguyen. H N, Agnel S, et al. Electrical properties analysis of micro and nano compositeepoxy resin materials[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2011, 18(3): 651-658. [30] 华幼卿, 金日光. 高分子物理[M]. 北京: 化学工业出版社, 2013. [31] 尹正勇, 李波. α型氧化铝的微观结构对红外光谱图的影响[J]. 光谱实验室, 2007, 24(3): 341-344. Yin Zhengyong, Li Bo.Effect of alpha type alumina microstructure on infrared spectra[J]. Chinese Journal of Spectroscopy Laboratory, 2007, 24(3): 341-344.