Gas decomposition and electrode degradation characteristics of a 20%C_(3)F_(7)CN and 80%CO_(2) gas mixture for high voltage accelerators

作     者：Ibrahim Iddrissu Qinghua Han Lujia Chen Louis Maksoud Yannick Kieffel 

作者机构：Department of Electrical and Electronic EngineeringThe University of ManchesterManchesterUK Materials Research DepartmentGeneral ElectricGrid Solutions SASVilleurbanneFrance 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2021年第6卷第5期

页      面：750-759页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This work is funded by the LIFE_SF_(6)-FREE project through the European Union[LIFE17 CCM/BE/00013] the Engineering and Physical Sciences Research Council through the Centre for Doctoral Training in Ma-terials for Demanding Environments[grant number EP/L01680X/1] The authors acknowledge EPSRC for support through‘High Voltage Test Systems for Electricity Network Research’[grant number EP/P030343/1] 

主　　题：mixture electrode characteristics 

摘      要：Sulphur hexafluoride(SF_(6))is a potent greenhouse gas used in high voltage *** a promising alternative to SF_(6),the C_(3)F_(7)CN/CO_(2)gas mixture and its by‐products are of great interest to ensure the safe operation of accelerators that will adopt any SF_(6)‐free *** work experimentally examines the electrical ageing characteristics of a 20%C_(3)F_(7)CN/80%CO_(2)gas mixture tested using spark gaps under a pressure of 7.2 bar(abs.).Gas samples were collected after 1000 DC breakdowns and analysed using gas chro-matography mass spectrometry(GC‐MS)with an estimated toxicity value of 54,459 ppmv,which indicates the aged mixture to be non‐*** investigation was conducted on the gas‐solid interface after 500 breakdowns for both SF_(6) and the 20%C_(3)F_(7)CN/80%CO_(2)gas *** electrodes were analysed using X‐ray photoelec-tron spectroscopy(XPS)and X‐ray diffraction(XRD)*** surface analysis revealed the formation of metal fluorides on the electrode surface tested using the 20%C_(3)F_(7)CN/80%CO_(2)mixture,whereas metal fluorides and sulphides were detected for electrodes tested with SF_(6).The findings provide a reference on the toxicity and gas‐solid interaction of the electrically aged 20%C_(3)F_(7)CN/80%CO_(2)gas mixture for potential retro‐fill application in high voltage accelerators.