C_4F_7N/CO_2混合气体中环氧绝缘子雷电冲击沿面绝缘特性
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摘要
C_4F_7N/CO_2混合气体作为环保型绝缘气体,有望在未来取代SF_6,但目前对其绝缘子的沿面闪络特性鲜有研究。为此,搭建了沿面闪络试验平台,建立了基于PRSV方程的气体混合方法,开展了均匀电场下C_4F_7N/CO_2混合气体的冲击沿面闪络特性研究,分析了摩尔分数、气压、沿面距离和绝缘子直径对50%冲击沿面闪络电压的影响,并与相同条件下的SF_6进行对比。研究发现,随着气压或摩尔分数的增加,沿面闪络电压呈饱和增长趋势。5%C_4F_7N/95%CO_2混合气体相对沿面闪络强度为SF_6的70%以上;9%C_4F_7N/91%CO_2的相对绝缘强度为SF_6的80%以上;13%C_4F_7N/87%CO_2的相对绝缘强度为SF_6的90%以上。随着沿面距离的增加,闪络场强基本稳定,而绝缘子直径对沿面闪络电压的影响可以忽略。此外,拟合获得了不同摩尔分数的C_4F_7N/CO_2混合气体的沿面闪络电压经验公式。
C_4F_7 N/CO_2 mixture, as an environment-friendly insulating gas, is expected to replace SF_6 in the future. However,there is no research on the surface flashover characteristics of the insulator in C_4F_7 N/CO_2 mixtures. Consequently, we established a surface flashover experimental platform in order to investigate the surface flashover characteristics of the insulator in uniform field in C_4F_7 N/CO_2 mixtures under the lightening impulse voltage. Moreover, we put forward a gas mixing method based on PRSV equation, investigated the influences of molar fraction, gas pressure, creepage length and diameters of the insulator on the surface flashover characteristics of insulator, and compared them with those of SF_6 under the same conditions.The study shows that the surface flashover voltage of the insulator in C_4F_7 N/CO_2 gas mixtures will increase as the gas pressure and molar fraction of C_4F_7 N increase with a saturation growth trend. When the molar fractions of C_4F_7 N are 5%, 9%,and 13%, the surface flashover voltage of C_4F_7 N/CO_2 gas mixture can reach more than 70%, 80% and 90% of those of pure SF_6 under same conditions, respectively. Under the experimental conditions, the flashover field basically stabilizes with the increase of the distance along the surface, and the effect of insulator diameter on the flashover voltage along the surface can be ignored. Moreover, the empirical formulas of surface flashover voltage are obtained.
C_4F_7 N/CO_2 mixture, as an environment-friendly insulating gas, is expected to replace SF_6 in the future. However,there is no research on the surface flashover characteristics of the insulator in C_4F_7 N/CO_2 mixtures. Consequently, we established a surface flashover experimental platform in order to investigate the surface flashover characteristics of the insulator in uniform field in C_4F_7 N/CO_2 mixtures under the lightening impulse voltage. Moreover, we put forward a gas mixing method based on PRSV equation, investigated the influences of molar fraction, gas pressure, creepage length and diameters of the insulator on the surface flashover characteristics of insulator, and compared them with those of SF_6 under the same conditions.The study shows that the surface flashover voltage of the insulator in C_4F_7 N/CO_2 gas mixtures will increase as the gas pressure and molar fraction of C_4F_7 N increase with a saturation growth trend. When the molar fractions of C_4F_7 N are 5%, 9%,and 13%, the surface flashover voltage of C_4F_7 N/CO_2 gas mixture can reach more than 70%, 80% and 90% of those of pure SF_6 under same conditions, respectively. Under the experimental conditions, the flashover field basically stabilizes with the increase of the distance along the surface, and the effect of insulator diameter on the flashover voltage along the surface can be ignored. Moreover, the empirical formulas of surface flashover voltage are obtained.
引文
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[15]3M Novec Brand.3M Novec 4710 insulating gas[EB/OL].[2019-01-25].https://multimedia.3m.com/mws/media/1132124O/3mnovec-4710-insulating-gas.pdf.
[16]STRYJEK R,VERA J H.PRSV:an improved Peng-Robinson equation of state for pure compounds and mixtures[J].The Canadian Journal of Chemical Engineering,1986,64(2):323-333.
[17]SUDARSHAN T S,DOUGAL R A.Mechanisms of surface flashover along solid dielectrics in compressed gases:a review[J].IEEE Transactions on Electrical Insulation,1986,21(5):727-746.
[18]严璋,朱德恒.高电压技术[M].北京:中国电力出版社,2015:169.YAN Zhang,ZHU Deheng.High voltage isulation technology[M].Beijing,China:China Electric Power Press,2015:169.
[2]覃兆宇,郑宇,卫李静,等.低温下SF6/N2混合气体的雷电冲击绝缘特性[J].高电压技术,2017,43(12):3907-3913.QIN Zhaoyu,ZHENG Yu,WEI Lijing,et al.Impulse insulation property of SF6/N2 mixture under low temperatures[J].High Voltage Engineering,2017,43(12):3907-3913.
[3]郭璨,张乔根,文韬,等.雷电冲击下极不均匀电场中SF6/N2混合气体的协同现象[J].高电压技术,2016,42(2):635-641.GUO Can,ZHANG Qiaogen,WEN Tao,et al.Synergistic effect of SF6/N2 gas mixtures in slightly non-uniform electric field under lightning impulse[J].High Voltage Engineering,2016,42(2):635-641.
[4]KIEFFEL Y,IRWIN T,PONCHON P,et al.Green gas to replace SF6in electrical grids[J].IEEE Power&Energy Magazine,2016,14(2):32-39.
[5]KIEFFEL Y,BIQUEZ F,PONCHON P.Alternative gas to SF6 for use in high voltage switchgears:g3[C]∥23rd International Conference on Electricity Distribution.Lyons,France:CIRED,2015:0230.
[6]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&Electrical Insulation,2017,23(5):2587-2593.
[7]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&Electrical Insulation,2017,24(2):886-892.
[8]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 gases under AC corona discharge[J].High Voltage Engineering,2018,44(10):3174-3182.
[9]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 researching electrical characteristics of environment-friendly insulating gases[J].High Voltage Engineering,2018,44(10):3114-3124.
[10]高克利,颜湘莲,王浩,等.环保型气体绝缘输电线路(GIL)技术发展[J].高电压技术,2018,44(10):3105-3113.GAO Keli,YAN Xianglian,WANG Hao,et al.Progress in environment-friendly gas-insulated transmission line(GIL)[J].High Voltage Engineering,2018,44(10):3105-3113.
[11]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.
[12]NITTA T,FUJIWARA Y,ARAHATA Y,et al.,Factors controlling surface flashover in SF6 gas insulated systems[J].IEEE Transactions on Power Apparatus and Systems,1978,97(3):959-968.
[13]汪沨,肖晓林,张宪标,等.基于PIC法SF6/N2混合气体中绝缘子沿面放电特性研究[J].电工技术学报,2011,26(8):220-226.WANG Feng,XIAO Xiaolin,ZHANG Xianbiao,et al.Research on the insulator surface discharge characteristics in SF6/N2 gas mixture using PIC method[J].Transactions of China Electrotechnical Society,2011,26(8):220-226.
[14]VOLPOV E.HVDC gas insulated apparatus:electric field specificity and insulation design concept[J].IEEE Electrical Insulation Magazine,2002,18(2):7-36.
[15]3M Novec Brand.3M Novec 4710 insulating gas[EB/OL].[2019-01-25].https://multimedia.3m.com/mws/media/1132124O/3mnovec-4710-insulating-gas.pdf.
[16]STRYJEK R,VERA J H.PRSV:an improved Peng-Robinson equation of state for pure compounds and mixtures[J].The Canadian Journal of Chemical Engineering,1986,64(2):323-333.
[17]SUDARSHAN T S,DOUGAL R A.Mechanisms of surface flashover along solid dielectrics in compressed gases:a review[J].IEEE Transactions on Electrical Insulation,1986,21(5):727-746.
[18]严璋,朱德恒.高电压技术[M].北京:中国电力出版社,2015:169.YAN Zhang,ZHU Deheng.High voltage isulation technology[M].Beijing,China:China Electric Power Press,2015:169.