中压设备中SF_(6)替代气体的试验研究  

Study on experimental SF_(6) replacement gas in medium gas pressure equipment

作　　者：尤天鹏 董旭柱 周文俊[1] 郑宇 李涵[1] 任书波 YOU Tian-peng;DONG Xu-zhu;ZHOU Wen-jun;ZHENG Yu;LI Han;REN Shu-bo(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072

出　　处：《电机与控制学报》2022年第3期59-65,共7页Electric Machines and Control

基　　金：国家自然科学基金(U1966211)。

摘　　要：探索可能在中压设备中替代SF_(6)的气体,已经是国际上的热点问题。通过考虑介电强度、GWP和液化温度等指标得到了数据库中有潜力替代中压设备中的4种气体。通过工频放电试验,研究了4种气体在均匀电场(以板板电极模拟均匀电场)下的工频放电特性,并以SF_(6)气体为对照,得到了绝缘气体的工频击穿电压达到与0.1~0.2 MPa SF_(6)气体相同时所对应的气压,发现了绝缘气体在气压为0.3 MPa时工频击穿电压变化最不明显。试验结果发现:板-板电极、5 mm间隙下,绝缘介质的工频击穿电压随气压的升高呈饱和增长趋势,CF_(3)SO_(2)F、C_(4)F_(7)N、C_(5)F_(10)O和CF_(3)I气体体积分数为SF_(6)气体的0.3~1.2倍时,工频击穿电压达到和SF_(6)相同的水平。结合工频放电电压、介电强度、GWP和液化温度等因素,分析得到了CF_(3)SO_(2)F气体具备应用于中气压(0.1~0.3 MPa)电力设备的潜力。It is a popular issue in the world to explore the possible replacement of SF_(6)gas in medium gas pressure equipment.By considering dielectric strength,GWP and liquefaction temperature,four kinds of gases in the databases are identified as potential substitutes for medium gas pressure equipment.Through AC discharge tests,the AC discharge characteristics of four gases under uniform electric field were studied.Taking SF_(6)gas as the control,the corresponding pressure of the AC breakdown voltage of the insulating gas was obtained.When the AC breakdown voltage is the same as that of SF_(6)gas at 0.1~0.2 MPa.It is found that the AC breakdown voltage of the insulating gas has the least obvious change when the pressure is 0.3 MPa.The method of increasing the pressure of insulating gases by charging conventional gases were proposed to replace SF_(6)gas in medium gas pressure equipment.When the volume fraction of CF_(3)SO_(2)F,C_(4)F_(7)N,C_(5)F_(10)O and CF_(3)I gases are 0.3~1.2 times that of SF_(6)gas,the AC breakdown voltage reaches the same level as that of SF_(6)gas.Combined with power frequency discharge voltage,dielectric strength,GWP and liquefaction temperature,the analysis shows that CF_(3)SO_(2)F gas has the potential to be used in power equipment with medium gas pressure(0.1~0.3 MPa).

关 键 词：绝缘气体 替代气体 气体放电 试验研究 工频击穿电压 中压设备 

分 类 号：TM835[电气工程—高电压与绝缘技术]