Feasibility of C_(3)F_(7)CN/CO_(2)gas mixtures in high-voltage DC GIL:a review on recent advances  

作　　者：Youping Tu Geng Chen Cong Wang Yuming Shao Yujing Tong Chuanyang Li Guoming Ma Tohid Shahsavarian 

机构地区：[1]State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources,North China Electric Power University,Beijing,People's Republic of China [2]Electrical Insulation Research Center,Institute of Materials Science,Electrical and Computer Engineering,University of Connecticut,Storrs,CT 06269,USA

出　　处：《High Voltage》2020年第4期377-386,共10页高电压（英文）

基　　金：This work was supported by the National Natural Science Foundation of China under NSFC Grant No.51877080;the National Basic Research Program of China(973 Project)under Grant No.2014CB239502.

摘　　要：With the rise of renewable energy resources,especially offshore wind power plant,the DC transmission concept has attracted more and more attention.The selection of eco-friendly insulating gas,as most critical insulating part of gas-insulated equipment is top priority for developing highly reliable system.Moreover,it is acknowledged that eco-friendly C_(3)F_(7)CN/CO_(2) gas mixtures have become a potential alternative to SF_(6) gas due to its excellent performance.This study reviews the basic physical properties of C_(3)F_(7)CN gas/gas mixtures and insulation properties including the gas gap breakdown and surface flashover performance at DC,as well as lightning impulse voltage.Investigation about the gas stability is presented,including the compatibility of gas with solid materials in gas-insulated transmission line(GIL),and the decomposition characteristics under long-term electrical and thermal stresses.The important progress on the charge accumulation characteristics of gas-solid interface in the novel gas environment under DC voltage stress is analysed.Finally,the key issues that need to be paid attention to and further followed through regarding the application of this novel gas in GIL are summarised and put forward.This study hopefully can provide a complete reference for the development of eco-friendly DC gas insulation equipment with C_(3)F_(7)CN/CO_(2) gas mixtures.

关 键 词：GIL INSULATION LIGHTNING 

分 类 号：TM72[电气工程—电力系统及自动化]