Effect of the grain boundary character distribution on the sulfur corrosion behaviour and mechanisms of copper windings under different high temperatures  

作　　者：Xu Dai Yuan Yuan Jiang Zhou Guoyong Liu Tao Zhu Huiying Xiang Qi Yu Xue Gao Ruijin Liao 

机构地区：[1]State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing,China [3]Dongfang Electric Machinery Co.,Ltd,Deyang,China

出　　处：《High Voltage》2024年第3期566-580,共15页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:51677015。

摘　　要：As a typical failure phenomenon in transformers,sulfur corrosion has garnered significant attention in the field of high-voltage engineering.Grain boundary character distribution(GBCD)copper windings have been introduced to enhance sulfur corrosion resistance by slowing down intergranular corrosion.In this study,the sulfur corrosion behaviour and mechanisms of the GBCD copper windings under various temperatures were experi-mentally and theoretically studied.Results show that GBCD can enhance the corrosion resistance of copper in liquid environments.With the increase in temperatures,the insulating properties of oil and papers in traditional copper windings experience notable degradation,while GBCD copper windings show more stable insulating behaviours.In addition,modelling of grain boundary energy indicates that the grain boundary structure of GBCD copper windings has a lower average interface energy of 0.170 eV/Å2.Cal-culations of reaction thermodynamics show that GBCD copper windings possess a higher failure temperature(135.2℃)and inhibition degree(activation energy)of the sulfur corrosion(32,557.62 J/mol),revealing the stability and enhanced sulfur corrosion resis-tance at elevated temperatures.

关 键 词：CORROSION GRAIN COPPER 

分 类 号：TM41[电气工程—电器]