电晕放电下二元全氟异丁腈(CF_3)_2CFCN混合气体的分解特性分析
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摘要
近几年提出的环境友好型气体绝缘介质全氟异丁腈(CF_3)_2CFCN在介电特性和环保方面表现良好,具有替代SF_6气体的可能性。为探究(CF_3)_2CFCN的放电分解特性,选取了N_2、空气和CO_2与(CF_3)_2CFCN构成二元混合气体,在一系列工频电晕放电实验的基础上,利用气相色谱质谱联用技术检测了(CF_3)_2CFCN与3种不同缓冲气体混合后的放电分解产物,并定量分析了气体分解组分与缓冲气体的关联。实验结果表明:(CF_3)_2CFCN的二元混合气体放电分解产物主要是CO、CO_2、CF_4、C_2F_6、C_2F_4、C_3F_8、C_3F_6、C_4F_(10)、CF_3CN、CNCN和C_2F_5CN等。同一实验条件下(CF_3)_2CFCN/空气分解组分中CO_2体积分数要比(CF_3)_2CFCN/N_2分解组分中的高得多;(CF_3)_2CFCN/CO_2混合气体分解产物中产生了较高体积分数的CO气体,使用(CF_3)_2CFCN/CO_2混合气体时应密切关注分解组分CO气体的体积分数。
The perfluoroiso-butyrontrile(CF_3)_2 CFCN is the environmentally friendly gas-insulating dielectric, and performs well in dielectric properties and environmental protection, which has the potential to replace SF_6 gas. In this paper,a series of AC corona discharge experiments were carried out, and the gas and solid decomposition by-products of(CF_3)_2 CFCN mixed with N_2, air and CO_2 were qualitatively detected by gas chromatography-mass spectrometry(GC/MS)method. Then the effects of buffer gases on the decomposition characteristics of(CF_3)_2 CFCN mixed gas under corona discharge were quantitively analyzed based on the GC/MS method. The results show that the gas decomposition by-products of(CF_3)_2 CFCN mixtures are CO, CO_2, CF_4, C_2 F_6, C_2 F_4, C_3 F_8, C_3 F_6, C_4 F_(10), CF_3 CN, CNCN, C_2 F_5 CN, etc. The volume fraction of CO_2 in the(CF_3)_2 CFCN/air decomposition components is much higher than that in the(CF_3)_2 CFCN/N_2 decomposition components.(CF_3)_2 CFCN/CO_2 mixed gas decomposes to a large amount of CO. Therefore, when the(CF_3)_2 CFCN/CO_2 mixed gas is adopted, the volume fraction of CO gas should be closely monitored.
The perfluoroiso-butyrontrile(CF_3)_2 CFCN is the environmentally friendly gas-insulating dielectric, and performs well in dielectric properties and environmental protection, which has the potential to replace SF_6 gas. In this paper,a series of AC corona discharge experiments were carried out, and the gas and solid decomposition by-products of(CF_3)_2 CFCN mixed with N_2, air and CO_2 were qualitatively detected by gas chromatography-mass spectrometry(GC/MS)method. Then the effects of buffer gases on the decomposition characteristics of(CF_3)_2 CFCN mixed gas under corona discharge were quantitively analyzed based on the GC/MS method. The results show that the gas decomposition by-products of(CF_3)_2 CFCN mixtures are CO, CO_2, CF_4, C_2 F_6, C_2 F_4, C_3 F_8, C_3 F_6, C_4 F_(10), CF_3 CN, CNCN, C_2 F_5 CN, etc. The volume fraction of CO_2 in the(CF_3)_2 CFCN/air decomposition components is much higher than that in the(CF_3)_2 CFCN/N_2 decomposition components.(CF_3)_2 CFCN/CO_2 mixed gas decomposes to a large amount of CO. Therefore, when the(CF_3)_2 CFCN/CO_2 mixed gas is adopted, the volume fraction of CO gas should be closely monitored.
引文
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[2]CHRISTOPHOROU L G,OLTHOFF J K,GREEN D S.Gases for electrical insulation and arc interruption:possible present and future alternatives to pure SF6[R].[S.1.]:NIST Technical Note 1425,1997:1-44.
[3]WOOTON R,KEGELMAN M.Gases superior to SF6 for insulation and interruption[R].[S.1.]:Electric Power Research Insititute(EPRI),1982.
[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]肖登明.环保型绝缘气体的发展前景[J].高电压技术,2016,42(4):1035-1046.XIAO Dengming.Development prospect of gas insulation based on environmental protection[J].High Voltage Engineering,2016,42(4):1035-1046.
[6]RABIE M,FRANCK C M.Computational screening of new high voltage insulation gases with low global warming potential[J].IEEETransactions on Dielectrics and Electrical Insulation,2015,22(1):296-302.
[7]POHLIN K,KIEFFEL Y,OWENS J.Characteristics of fluoronitrile/CO2 mixture-an alternative to SF6[C]//CIGRE 2016.Paris,France:CIGRE,2016:D1-204.
[8]OWENS J G.Greenhouse gas emission reductions through use of a sustainable alternative to SF6[C]//Proceedings of the 2016 IEEE Electrical Insulation Conference(EIC).Montréal,Canada:IEEE,2016:535-538.
[9]BLáZQUEZ S,ANTI?OLO M,NIELSEN O J,et al.Reaction kinetics of(CF3)2CFCN with OH radicals as a function of temperature(278~358 K):a good replacement for greenhouse SF6?[J].Chemical Physics Letters,2017,687(Supplement C):297-302.
[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 environment-friendly gases mixtures of C4F7N and C5F10O with CO2[J].High Voltage Engineering,2017,43(3):708-714.
[11]ZHANG X X,LI Y,XIAO S,et al.Theoretical study of the decomposition mechanism of environmentally friendly insulating medium C3F7CN in the presence of H2O in a discharge[J].Journal of Physics D:Applied Physics,2017,50(32):325201.
[12]KIEFFEL Y,BIQUEZ F,PONCHON P,et al.SF6 alternative development for high voltage switchgears[C]//CIGRE 2014.Paris,France:CIGRE,2014:D1-305.
[13]LUTZ B,JUHRE K,KUSCHEL M,et al.Behavior of gaseous dielectrics with low global warming potential consideringpartial discharges and electric arcing[C]//CIGRE 2017.Winnipeg,Canada:CIGRE,2017:D1-140.
[14]PREVE C,PICCOZ D,MALADEN R.Validation method and comparison of SF6 alternative gases[C]//CIGRE 2016.Paris,France:CIGRE,2016:D1-205.
[15]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.
[16]NECHMI H E,BEROUAL A,GIRODET A,et al.Fluoronitriles/CO2gas mixture as promising substitute to SF6 for insulation in high voltage applications[J].IEEE Transactions on Dielectrics and Electrical Insulation,2017,23(5):2587-2593.
[17]HOPF A,BRITTON J A,ROSSNER M,et al.Dielectric strength of SF6 substitutes,alternative insulation gases and PFC-gas-mixtures[C]//Proceedings of the Electrical Insulation Conference(EIC).Baltimore,USA:IEEE,2017:209-212.
[18]TU Y P,CHENG Y,WANG C,et al.Insulation characteristics of fluoronitriles/CO2 gas mixture under DC electric field[J].IEEETransactions on Dielectrics and Electrical Insulation,2018,25(4):1324-1331.
[19]YU X J,HOU H,WANG B S.Mechanistic and kinetic investigations on the thermal unimolecular reaction of heptafluoroisobutyronitrile[J].The Journal of Physical Chemistry A,2018,122(38):7704-7715.
[20]HYNES R G,MACKIE J C,MASRI A R.Inhibition of premixed hydrogen-air flames by 2-H heptafluoropropane[J].Combustion and Flame,1998,113(4):554-565.
[21]European Chemicals Agency.C&L Inventory database[DB/OL].[2018-05-26].https://echa.europa.eu/information-on-chemicals/cl-inve ntory-database/-/discli/details/.
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