不均匀电场中C_3F_7CN/CO_2混合气体直流局部放电特性
|
摘要
近年来C_3F_7CN气体作为优异的环保绝缘介质成为了SF_6替代气体领域的研究热点,然而目前鲜见其混合气体直流局部放电特性的研究。为此,利用针–板电极模拟不均匀电场测试了C_3F_7CN/CO_2混合气体在直流电压下的局部放电起始电压,获得了气压、电压极性和电场不均匀度对气体局部放电起始电压的影响规律,并与SF_6及SF_6/N_2混合气体进行了对比。结果表明,C_3F_7CN/CO_2混合气体的局部放电起始电压随气压的增大呈现出非线性增长趋势;特定电场不均匀系数和电压极性下,C_3F_7CN/CO_2混合气体的局部放电起始电压随气压变化而表现出"驼峰效应";C_3F_7CN/CO_2混合气体的局部放电起始电压受电压极性影响较大;此外,当电场不均匀系数在5.74～49.93范围内时,C_3F_7CN/CO_2混合气体的局部放电起始电压存在着极小值。直流局部放电特性的研究发现C_3F_7CN/CO_2混合气体抑制直流局部放电的能力相当甚至优于SF_6/N_2混合气体。
C_3 F_7 CN gas, as an excellent environmental protection dielectric for insulators, has recently become a research hotspot in the field of SF_6 alternative gas. However, there are few studies on DC partial discharge characteristics of its mixed gas. Therefore, we measured the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture under DC voltage by using a needle-plate electrode to simulate non-uniform electric field. The effects of gas pressure, voltage polarity and electric field inhomogeneity on partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture were studied and compared with SF_6 and SF_6/N_2 mixture. The results show that the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture shows a non-linear growth trend with the increase of gas pressure. The change of the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture will present a "hump effect" with gas pressure under the specific electric field nonuniformity coefficient and voltage polarity. The partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture is significantly affected by voltage polarity. The partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture has a minimum value in the range of5.74～49.93 electric field inhomogeneity coefficient. The study of DC partial discharge characteristics shows that the ability of C_3 F_7 CN/CO_2 gas mixture to suppress DC partial discharge is equivalent to or even better than SF_6/N_2 gas mixture.
C_3 F_7 CN gas, as an excellent environmental protection dielectric for insulators, has recently become a research hotspot in the field of SF_6 alternative gas. However, there are few studies on DC partial discharge characteristics of its mixed gas. Therefore, we measured the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture under DC voltage by using a needle-plate electrode to simulate non-uniform electric field. The effects of gas pressure, voltage polarity and electric field inhomogeneity on partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture were studied and compared with SF_6 and SF_6/N_2 mixture. The results show that the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture shows a non-linear growth trend with the increase of gas pressure. The change of the partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture will present a "hump effect" with gas pressure under the specific electric field nonuniformity coefficient and voltage polarity. The partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture is significantly affected by voltage polarity. The partial discharge initial voltage of C_3 F_7 CN/CO_2 gas mixture has a minimum value in the range of5.74～49.93 electric field inhomogeneity coefficient. The study of DC partial discharge characteristics shows that the ability of C_3 F_7 CN/CO_2 gas mixture to suppress DC partial discharge is equivalent to or even better than SF_6/N_2 gas mixture.
引文
[1]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.
[2]张文亮,于永清,李光范,等.特高压直流技术研究[J].中国电机工程学报,2007,27(22):1-7.ZHANG Wenliang,YU Yongqing,LI Guangfan,et al.Researchs on UHVDC technology[J].Proceedings of the CSEE,2007,27(22):1-7.
[3]齐波,张贵新,李成榕,等.气体绝缘金属封闭输电线路的研究现状及应用前景[J].高电压技术,2015,41(5):1466-1473.QI Bo,ZHANG Guixin,LI Chengrong,et al.Research status and prospect of gas-insulated metal enclosed transmission line[J].High Voltage Engineering,2015,41(5):1466-1473.
[4]HERMANN K.Gas-insulated transmission lines[M].Chichester,UK:Wiley-IEEE Press,2012:33-38.
[5]KIEFFEL Y,GIRODET A,BIOIEZ F,et al.SF6 alternative development for high voltage switchgears[C]∥CIGRE.Paris,France:GIGRE,2014:379-383.
[6]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 C4F7CN and C5F10O with CO2[J].High Voltage Engineering,2017,43(3):708-714.
[7]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.
[8]WANG C,CHENG Y,TU Y P,et al.Characteristics of C3F7CN/CO2 as an alternative to SF6 in HVDC-GIL systems[J].IEEE Transactions on Dielectrics and Electrical Insulation,2018,25(4):1351-1356.
[9]NECHMI H E,BEROUAL A,GIRODET A,et al.Fluoronitriles/CO2gas mixture as promising substitute to SF6 insulation in high voltage applications[J].IEEE Transactions on Dielectrics and Electrical Insulation,2016,23(5):2587-2593.
[10]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.
[11]XIAO D M.Gas discharge and gas insulation[M].Shanghai,China:Shanghai Jiao Tong University Press,2016:9-11.
[12]唐念,杨东,周永言,等.不同气压下两种缺陷的SF6负极性直流局部放电分解特性[J].高电压技术,2018,44(9):2911-2916.TANG Nian,YANG Dong,ZHOU Yongyan,et al.Decompositon characteristics of SF6 at negative DC partial discharge by two typical defects under different pressure[J].High Voltage Engineering,2018,44(9):2911-2916.
[13]李鹏,李志兵,孙倩,等.特高压气体绝缘金属封闭输电线路绝缘设计[J].电网技术,2015,39(11):3305-3312.LI Peng,LI Zhibing,SUN Qian,et al.Research on insulation design of UHV gas-insulated metal-enclosed transmission line[J].Power System Technology,2015,39(11):3305-3312.
[14]唐炬,佘新,万凌云,等.负极性直流局部放电量与SF6分解过程的关联特性[J].中国电机工程学报,2018,38(2):628-636,693.TANG Ju,SHE Xin,WAN Lingyun,et al.Correlation characterstics between partial discharge quantity and SF6 decomposition process under negative DC condition[J].Proceedings of the CSEE,2018,38(2):628-636,693.
[15]PICCIN R,MOR A R,MORSHUIS P,et al.Partial discharge analysis of gas insulated systems at high voltage AC and DC[J].IEEE Transactions on Dielectrics&Electrical Insulation,2015,22(1):218-228.
[16]YUAN Z K,TU Y P,WANG C,et al.Research on liquefaction characteristics of SF6 substitute gases[J].Journal of Electrical Engineering&Technology,2018,13(6):2402-2411.
[17]屠幼萍,袁之康,罗兵,等.0.4~0.8 MPa气压下二元混合气体SF6/N2和SF6/CO2露点温度计算[J].高电压技术,2015,41(5):1446-1450.TU Youping,YUAN Zhikang,LUO Bing,et al.Calculation on dew temperatures of binary gas mixtures SF6/N2 and SF6/CO2 under0.4~0.8 MPa gas pressures[J].High Voltage Engineering,2015,41(5):1446-1450.
[18]Standard test method for dielectric breakdown voltage and dielectric strength of solid electrical insulation materials under direct-voltage stress:ASTM-D3755-14[S].West Conshohocken,USA:ASTM International,2014.
[19]Standard test method for detection and measurement of partial discharge(corona)pulses in evaluation of insulation systems:ASTM-D1868-13[S].West Conshohocken,USA:ASTM International,2013.
[2]张文亮,于永清,李光范,等.特高压直流技术研究[J].中国电机工程学报,2007,27(22):1-7.ZHANG Wenliang,YU Yongqing,LI Guangfan,et al.Researchs on UHVDC technology[J].Proceedings of the CSEE,2007,27(22):1-7.
[3]齐波,张贵新,李成榕,等.气体绝缘金属封闭输电线路的研究现状及应用前景[J].高电压技术,2015,41(5):1466-1473.QI Bo,ZHANG Guixin,LI Chengrong,et al.Research status and prospect of gas-insulated metal enclosed transmission line[J].High Voltage Engineering,2015,41(5):1466-1473.
[4]HERMANN K.Gas-insulated transmission lines[M].Chichester,UK:Wiley-IEEE Press,2012:33-38.
[5]KIEFFEL Y,GIRODET A,BIOIEZ F,et al.SF6 alternative development for high voltage switchgears[C]∥CIGRE.Paris,France:GIGRE,2014:379-383.
[6]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 C4F7CN and C5F10O with CO2[J].High Voltage Engineering,2017,43(3):708-714.
[7]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.
[8]WANG C,CHENG Y,TU Y P,et al.Characteristics of C3F7CN/CO2 as an alternative to SF6 in HVDC-GIL systems[J].IEEE Transactions on Dielectrics and Electrical Insulation,2018,25(4):1351-1356.
[9]NECHMI H E,BEROUAL A,GIRODET A,et al.Fluoronitriles/CO2gas mixture as promising substitute to SF6 insulation in high voltage applications[J].IEEE Transactions on Dielectrics and Electrical Insulation,2016,23(5):2587-2593.
[10]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.
[11]XIAO D M.Gas discharge and gas insulation[M].Shanghai,China:Shanghai Jiao Tong University Press,2016:9-11.
[12]唐念,杨东,周永言,等.不同气压下两种缺陷的SF6负极性直流局部放电分解特性[J].高电压技术,2018,44(9):2911-2916.TANG Nian,YANG Dong,ZHOU Yongyan,et al.Decompositon characteristics of SF6 at negative DC partial discharge by two typical defects under different pressure[J].High Voltage Engineering,2018,44(9):2911-2916.
[13]李鹏,李志兵,孙倩,等.特高压气体绝缘金属封闭输电线路绝缘设计[J].电网技术,2015,39(11):3305-3312.LI Peng,LI Zhibing,SUN Qian,et al.Research on insulation design of UHV gas-insulated metal-enclosed transmission line[J].Power System Technology,2015,39(11):3305-3312.
[14]唐炬,佘新,万凌云,等.负极性直流局部放电量与SF6分解过程的关联特性[J].中国电机工程学报,2018,38(2):628-636,693.TANG Ju,SHE Xin,WAN Lingyun,et al.Correlation characterstics between partial discharge quantity and SF6 decomposition process under negative DC condition[J].Proceedings of the CSEE,2018,38(2):628-636,693.
[15]PICCIN R,MOR A R,MORSHUIS P,et al.Partial discharge analysis of gas insulated systems at high voltage AC and DC[J].IEEE Transactions on Dielectrics&Electrical Insulation,2015,22(1):218-228.
[16]YUAN Z K,TU Y P,WANG C,et al.Research on liquefaction characteristics of SF6 substitute gases[J].Journal of Electrical Engineering&Technology,2018,13(6):2402-2411.
[17]屠幼萍,袁之康,罗兵,等.0.4~0.8 MPa气压下二元混合气体SF6/N2和SF6/CO2露点温度计算[J].高电压技术,2015,41(5):1446-1450.TU Youping,YUAN Zhikang,LUO Bing,et al.Calculation on dew temperatures of binary gas mixtures SF6/N2 and SF6/CO2 under0.4~0.8 MPa gas pressures[J].High Voltage Engineering,2015,41(5):1446-1450.
[18]Standard test method for dielectric breakdown voltage and dielectric strength of solid electrical insulation materials under direct-voltage stress:ASTM-D3755-14[S].West Conshohocken,USA:ASTM International,2014.
[19]Standard test method for detection and measurement of partial discharge(corona)pulses in evaluation of insulation systems:ASTM-D1868-13[S].West Conshohocken,USA:ASTM International,2013.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |