摘要
干燥空气作为性能优异的缓冲气体与C_(4)F_(7)N气体混合后具有替代纯SF_(6)气体的潜力。目前,关于C_(4)F_(7)N/空气混合气体的研究主要集中于均匀电场下的绝缘性能,对其在不均匀电场下的击穿特性研究较少。在6种不同电场条件下,通过工频击穿实验探究电场不均匀度、气压、混合比对C_(4)F_(7)N/空气混合气体工频绝缘性能的影响,计算分析了不同C_(4)F_(7)N体积分数的C_(4)F_(7)N/空气混合气体的液化温度及GWP值,给出了可替代纯SF_(6)气体的混合比例及应用条件。结果表明,电场不均匀度较低时,随着气压升高、C_(4)F_(7)N体积分数的增大,C_(4)F_(7)N/空气混合气体工频绝缘性能逐渐接近甚至超过纯SF_(6)气体,电场不均匀度较高时,C_(4)F_(7)N/空气混合气体击穿电压随气压的升高呈现驼峰现象。C_(4)F_(7)N/空气混合气体对电场的敏感度略高于纯SF_(6)气体。通过综合分析C_(4)F_(7)N/空气混合气体绝缘性能、液化温度及GWP值,C_(4)F_(7)N体积分数为8%~12%的C_(4)F_(7)N/空气混合气体可在0.1~0.3 MPa范围内替代纯SF_(6)气体,最低工作温度可达−25℃,且其GWP值尚未达到纯SF_(6)气体的5%。
Dry air,as a buffer gas with excellent performance,has the potential to replace pure SF_(6) gas when mixed with C_(4)F_(7)N gas.However,the current research on C_(4)F_(7)N/air mixed gas mainly focuses on the insulating properties under uniform electric field,and the breakdown performances under non-uniform electric fields are rarely studied.Under six different electric field conditions,the influences of electric field inhomogeneity,air pressure and mixing ratio on the power frequency insulation performance of C_(4)F_(7)N/air mixed gas were investigated by power frequency breakdown tests,and the liquefaction of C_(4)F_(7)N/air mixed gas with different mixing ratios was calculated and analyzed.Temperature and GWP value,the mixing ratio and application conditions of alternative pure SF_(6) gas are given.The results show that,when the electric field inhomogeneity is low,the power frequency insulation performance of C_(4)F_(7)N/air mixture gas gradually approaches or even exceeds that of pure SF_(6) gas with the increase of air pressure and mixing ratio.The breakdown voltage of the mixed gas presents a hump phenomenon with the increase of the gas pressure.The sensitivity of C_(4)F_(7)N/air mixture to electric field is slightly higher than that of pure SF_(6) gas.By comprehensively analyzing the insulation performance,liquefaction temperature and GWP value of C_(4)F_(7)N/air mixed gas,the C_(4)F_(7)N/air mixed gas with a mixing ratio of 8%~12%can replace pure SF_(6) gas in the range of 0.1~0.3 MPa,the minimum working temperature can reach−25℃,and its GWP value has not yet reached 5%of pure SF_(6) gas.
作者
李峰
李凯
赵文彬
陈炯
邓云坤
LI Feng;LI Kai;ZHAO Wenbin;CHEN Jiong;DENG Yunkun(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Yunnan Power Grid Co.,Ltd.Electric Power Research Institute,Kunming 650217,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第7期2659-2667,共9页
High Voltage Engineering
基金
云南省基础研究计划项目(202001AT070006)
中国南方电网公司科技项目(YNKJXM20220051)。
