SF_6/N_2混合气体绝缘特性的实验研究  

Experimental Studies on Electrical Insulation Performances of SF_6/N_2 Gas Mixtures

作　　者：孙鹏程[1] 王帮田[1] 洪文芳 王其中[1] 

机构地区：[1]许继集团有限公司,河南许昌461000

出　　处：《中国电力》2012年第12期71-75,共5页Electric Power

摘　　要：目前绝大多数气体绝缘开关设备采用SF6气体绝缘,SF6泄漏导致严重的环保问题,人们迫切希望少采用或不采用SF6气体,以降低对环境的污染。为此,试验研究SF6和SF6/N2混合气体在不同混合比、不同压力以及在不同电场结构下的击穿特性,并与SF6气体的绝缘性能进行比较,试验结果表明:在N2中注入20%～30%的SF6气体后,SF6/N2混合气体绝缘性能指标可以达到纯SF6气体的80%左右,但若继续增加SF6气体的配比,则其耐电强度上升的幅度明显变慢;此外,试验研究还发现,极不均匀电场会大大降低气体的耐击穿电压强度。试验研究证明了采用SF6/N2混合气体代替纯SF6气体的技术方案的可行性。SF6 gas is widely used for gas-insulated switchgear(GIS),which has led to public concerns about environmental pollutions.It is urgently required to reduce or eliminate the use of SF6 gas in GISs so as to reduce the environmental pollutions.Various experiments were conducted to study the electrical breakdown characteristics of SF6 gas and N2/SF6 gas mixtures under different mixing ratios and working pressures and in different electric-field structures.The testing results indicate that the N2/SF6 gas mixture,when 20%～30% of SF6-gas is inputted in N2,can attain 80% of pure SF6 gas in electrical strength,but will have no significant increase in the strength with further increase of SF6-gas ratio.Moreover,it was found that the extremely uneven structure of electric field will significantly reduce the electrical strength of the gas.The testing results has verified the feasibility of SF6/N2 gas mixture in substituting pure SF6 gas.

关 键 词：气体绝缘开关设备 SF6/N2混合气体 SF6气体 电气绝缘特性 耐电强度 击穿电压 环境保护 

分 类 号：TM855[电气工程—高电压与绝缘技术]