高电压技术2019，Vol.45Issue(4)：1048-1055,8.DOI:10.13336/j.1003-6520.hve.20190321015
不均匀电场中C3F7CN/CO2混合气体直流局部放电特性
DC Partial Discharge Characteristics of C3F7CN/CO2 Gas Mixtures Under Non-uniform Electric Field
摘要
Abstract
C3 F7 CN gas, as an excellent environmental protection dielectric for insulators, has recently become a research hotspot in the field of SF6 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 C3 F7 CN/CO2 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 C3 F7 CN/CO2 gas mixture were studied and compared with SF6 and SF6/N2 mixture. The results show that the partial discharge initial voltage of C3 F7 CN/CO2 gas mixture shows a non-linear growth trend with the increase of gas pressure. The change of the partial discharge initial voltage of C3 F7 CN/CO2 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 C3 F7 CN/CO2 gas mixture is significantly affected by voltage polarity. The partial discharge initial voltage of C3 F7 CN/CO2 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 C3 F7 CN/CO2 gas mixture to suppress DC partial discharge is equivalent to or even better than SF6/N2 gas mixture.关键词
C3F7CN/CO2混合气体/直流局部放电特性/不均匀电场/环保绝缘气体/脉冲电流法Key words
C3F7CN/CO2 gas mixtures/DC partial discharge characteristics/non-uniform electric field/environment-friendly insulating gas/pulse current method引用本文复制引用
王璁,张颖,艾昕,屠幼萍,刘伟,颜湘莲..不均匀电场中C3F7CN/CO2混合气体直流局部放电特性[J].高电压技术,2019,45(4):1048-1055,8.基金项目
国家重点研发计划 (2017YFB0902500) （2017YFB0902500）
国家电网公司总部科技项目 (环保型管道输电关键技术) （环保型管道输电关键技术）
