SF_(6) decomposition behaviour under partial discharge of typical insulation defects in gas-solid insulated valve-side bushing of converter transformer  

作　　者：Hongtu Cheng Fuping Zeng Bowen Tang Haotian Li Ju Tang Zujian Huang Xianzong Chao 

机构地区：[1]School of Electrical Engineering and Automation,Wuhan University,Wuhan,China [2]Hubei Key Laboratory of Power Equipment&System Security for Integrated Energy Resources,Wuhan,China [3]School of Electrical and Electronic Engineering,Hubei University of Technology,Wuhan,China

出　　处：《High Voltage》2023年第4期690-697,共8页高电压（英文）

摘　　要：In this paper we investigated SF_(6) decomposition behaviour of typical insulation defects in gas-solid insulated converter transformer valve-side bushing under partial discharge(PD).Additionally,we compared the results with that of gas insulated switchgear(GIS).The results indicated that SF_(6) decomposition behaviour varies with the insulation defects type.For metal protrusion defects,the proportion ranking of CO_(2) and SO_(2) can be related to whether the needle tip is wrapped with epoxy resin-impregnated paper(ERIP).The proportion of carbon-containing products is much higher under contamination defect than under other defects.Moreover,the proportion of carbon-containing components is higher under flashover condition than under PD condition and is accompanied by the appearance of H2S and CS_(2).However,the yield of SO_(2)F_(2) is always low.Compared to negative DC voltages,positive DC voltages have a higher proportion of carboncontaining components,mainly in the form of more CO_(2) and less SOF_(2).Compared to the PD decomposition behaviour of typical insulation defects in GIS,when PD involves ERIP,the proportion of carbon-containing products,especially CO_(2),is significant higher,while the proportion of sulphur containing products,especially SO_(2)F_(2),is lower.

关 键 词：behaviour INSULATION SOLID 

分 类 号：TM855[电气工程—高电压与绝缘技术]