高气压下环保型C_4F_7N/CO_2混合气体工频击穿特性
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摘要
全氟异丁腈(C4F7N)及其混合气体是近年来被广泛关注的可能替代六氟化硫(SF6)的新型环保绝缘气体。为了探究C_4F_7N/CO_2混合气体应用于高气压电气设备的潜力,利用气体绝缘特性实验平台对C_4F_7N/CO_2混合气体在不同混合比、不同气压下的工频击穿特性进行了实验研究,并与相同条件下的SF6进行了对比,同时结合饱和蒸气压特性探讨了C_4F_7N/CO_2混合气体应用于工程实际时的混合比选取范围。研究发现,C_4F_7N/CO_2混合气体的击穿电压随气压和混合比的升高呈饱和增长趋势,C4F7N体积分数分别为10%和20%的C_4F_7N/CO_2混合气体可以达到相同条件下SF6绝缘水平的80%和95%以上,C4F7N与CO2气体之间存在协同效应。综合工频击穿强度、液化温度等因素,体积分数4%～12%的混合气体具备应用于高气压(0.4～0.6 MPa)气体绝缘设备的潜力。
Perfluoroisobutyronitrile(C_4F_7N) and its gas mixtures are new environmental-friendly insulating medium that have received extensive attention in recent years and may replace sulfur hexafluoride(SF6).In this paper,in order to explore the potential of C_4F_7N/CO_2 gas mixtures applied to high pressure electrical equipment,the power frequency breakdown characteristics of C_4F_7N/CO_2 gas mixtures at different mixing ratios and pressures were studied and compared with SF6 under the same conditions through the gas insulated test platform and the mixing ratio range of C_4F_7N/CO_2 gas mixtures applied in engineering practice was discussed in combination with the saturated vapor pressure characteristics.The results show that the breakdown voltages of C_4F_7N/CO_2 gas mixtures show saturated growth trend with the increase of pressure and mixing ratio in the experimental interval.The C_4F_7N/CO_2 gas mixtures with C_4F_7N content of 10% and 20% can reach 80% and more than 95% of the SF6 insulation level under the same conditions,respectively,and there is a synergistic effect between C_4F_7N and CO2 gas.Considering factors such as power frequency breakdown strength and liquefaction temperature,the gas mixtures with C_4F_7N content of 4% to 12% have the potential to be applied to high pressure(0.4 MPa～0.6 MPa)gas insulated equipment.
Perfluoroisobutyronitrile(C_4F_7N) and its gas mixtures are new environmental-friendly insulating medium that have received extensive attention in recent years and may replace sulfur hexafluoride(SF6).In this paper,in order to explore the potential of C_4F_7N/CO_2 gas mixtures applied to high pressure electrical equipment,the power frequency breakdown characteristics of C_4F_7N/CO_2 gas mixtures at different mixing ratios and pressures were studied and compared with SF6 under the same conditions through the gas insulated test platform and the mixing ratio range of C_4F_7N/CO_2 gas mixtures applied in engineering practice was discussed in combination with the saturated vapor pressure characteristics.The results show that the breakdown voltages of C_4F_7N/CO_2 gas mixtures show saturated growth trend with the increase of pressure and mixing ratio in the experimental interval.The C_4F_7N/CO_2 gas mixtures with C_4F_7N content of 10% and 20% can reach 80% and more than 95% of the SF6 insulation level under the same conditions,respectively,and there is a synergistic effect between C_4F_7N and CO2 gas.Considering factors such as power frequency breakdown strength and liquefaction temperature,the gas mixtures with C_4F_7N content of 4% to 12% have the potential to be applied to high pressure(0.4 MPa～0.6 MPa)gas insulated equipment.
引文
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[18]杨津基.气体放电[M].北京:科学出版社,1983.
[19]Kieffel Y.Characteristics of g3-an alternative to SF6[C]//2016 IEEE International Conference on Dielectrics(ICD),Montpellier,Canada,2016,2:880-884.
[20]焦俊韬,肖登明,赵谡,等.低比例CF3I的CF3I-CO2混合气体在极不均匀电场中的绝缘特性[J].高电压技术,2017,43(3):772-779.Jiao Juntao,Xiao Dengming,Zhao Su,et al.Insulation characteristics for CF3I-CO2 gas mixtures with low proportion of CF3I in extreme non-uniform electric field[J].High Voltage Engineering,2017,43(3):772-779.
[21]肖淞,张晓星,韩晔飞,等.不均匀电场下CF3I/N2混合气体工频击穿特性实验[J].电工技术学报,2016,31(20):228-236.Xiao Song,Zhang Xiaoxing,Han Yefei,et al.Experiment on power frequency puncture of CF3I/N2gas mixtures in non-uniform electric fields[J].Transactions of China Electrotechnical Society,2016,31(20):228-236.
[2]张晓星,田双双,肖淞,等.SF6替代气体研究现状综述[J].电工技术学报,2018,33(12):2883-2893.Zhang Xiaoxing,Tian Shuangshuang,Xiao Song,et al A review study of SF6 substitute gases[J].Transactions of China Electrotechnical Society,2018,33(12):2883-2893.
[3]Zhang Xiaoxing,Xiao Hanyan,Tang Ju,et al.Recent advances in decomposition of the most potent greenhouse gas SF6[J].Critical Reviews in Environmental Science&Technology,2017,47(18):1763-1782.
[4]李鑫涛,林莘,徐建源,等.SF6/N2混合气体电击穿特性仿真及实验[J].电工技术学报,2017,32(20):42-52.Li Xintao,Lin Xin,Xu Jianyuan,et al.Simulations and experiments of dielectric breakdown characteristics in SF6/N2 gas mixtures[J].Transactions of China Electrotechnical Society,2017,32(20):42-52.
[5]邓云坤,马仪,赵谡,等.基于电子输运参数的CF3I及CF3I-N2混合气体绝缘性能分析[J].电工技术学报,2018,33(7):1641-1651.Deng Yunkun,Ma Yi,Zhao Su,et al.Analysis of the insulation properties of CF3I and CF3I-N2 gas mixtures from electron transport parameters[J].Transactions of China Electrotechnical Society,2018,33(7):1641-1651.
[6]Hyrenbach M,Zache S.Alternative insulation gas for medium-voltage switchgear[C]//Petroleum and Chemical Industry Conference Europe,Berlin,Germany,2016:1-9.
[7]Romero A,Rácz L,Mátrai A,et al.A review of sulfurhexafluoride reduction by dielectric coatings and alternative gases[C]//2017 6th International Youth Conference on Energy(IYCE),Budapest,Hungary,2017:1-5.
[8]Owens J G.Greenhouse gas emission reductions through use of a sustainable alternative to SF6[C]//IEEE Electrical Insulation Conference(EIC),Montreal Canada,2016:535-538.
[9]Kieffel Y,Biquez F.SF6 alternative development for high voltage switchgears[C]//IEEE Electrical Insulation Conference(EIC),Seattle,America,2015:379-383.
[10]李兴文,邓云坤,姜旭,等.环保气体C4F7N和C5F10O与CO2混合气体的绝缘性能及其应用[J].高电压技术,2017,43(3):708-714.Li Xingwen,Deng Yunkun,Jiang Xu,et al.Insulation performance and application of enviroment-friendly gases mixtures of C4F7N and C5F10O with CO2[J].High Voltage Engineering,2017,43(3):708-714.
[11]Nechmi H E,Beroual A,Girodet A,et al.Effective ionization coefficients and limiting field strength of fluoronitriles-CO2 mixtures[J].IEEE Transactions on Dielectrics and Electrical Insulation,2017,24(2):886-892.
[12]Kieffel Y,Irwin T,Ponchon P,et al.Green gas to replace SF6 in electrical grids[J].IEEE Power and Energy Magazine,2016,14(2):32-39.
[13]肖登明,阎究敦.气体绝缘输电线路(GIL)的应用及发展[J].高电压技术,2017,43(3):699-707.Xiao Dengming,Yan Jiudun.Application and development of gas insulated transmission line(GIL)[J].High Voltage Engineering,2017,43(3):699-707.
[14]邓云坤,马仪,陈先富,等.CF3I-N2混合气体在稍不均匀和极不均匀电场中的工频击穿特性[J].高电压技术,2017,43(3):754-764.Deng Yunkun,Ma Yi,Chen Xianfu,et al.ACbreakdown characteristics of CF3I-N2 gas mixtures in condition of quasi-homogeneous and extremely nonuniform electric field[J].High Voltage Engineering,2017,43(3):754-764.
[15]马沛生.化工数据教程[M].天津:天津大学出版社,2008.
[16]Li Yi,Zhang Xiaoxing,Chen Qi,et al.Study on the dielectric properties of C4F7N/N2 mixture under highly non-uniform electric field[J].IEEE Access,2018,6:42868-42876.
[17]赵智大.高电压技术[M].2版.北京:中国电力出版社,2006.
[18]杨津基.气体放电[M].北京:科学出版社,1983.
[19]Kieffel Y.Characteristics of g3-an alternative to SF6[C]//2016 IEEE International Conference on Dielectrics(ICD),Montpellier,Canada,2016,2:880-884.
[20]焦俊韬,肖登明,赵谡,等.低比例CF3I的CF3I-CO2混合气体在极不均匀电场中的绝缘特性[J].高电压技术,2017,43(3):772-779.Jiao Juntao,Xiao Dengming,Zhao Su,et al.Insulation characteristics for CF3I-CO2 gas mixtures with low proportion of CF3I in extreme non-uniform electric field[J].High Voltage Engineering,2017,43(3):772-779.
[21]肖淞,张晓星,韩晔飞,等.不均匀电场下CF3I/N2混合气体工频击穿特性实验[J].电工技术学报,2016,31(20):228-236.Xiao Song,Zhang Xiaoxing,Han Yefei,et al.Experiment on power frequency puncture of CF3I/N2gas mixtures in non-uniform electric fields[J].Transactions of China Electrotechnical Society,2016,31(20):228-236.
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