Micro‐mechanism study on synergistic degradation of the oil‐paper insulation with dibenzyl disulfide,hexadecyl mercaptan and benzothiophene  

作　　者：Haoxi Cong Hao Pan Xuefeng Hu Minhao Zhang Qingmin Li 

机构地区：[1]School of Electrical and Electronic Engineering,North China Electric Power University,Beijing,China [2]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing,China

出　　处：《High Voltage》2021年第3期448-459,共12页高电压（英文）

基　　金：Funding information National Natural Science Foundation of China,Grant/Award Number:51807061。

摘　　要：In recent years,there have been many cases of transformer failures caused by corrosive sulfides.At present,research mainly focuses on the single sulfide dibenzyl disulphide,but few research on multiple sulphur or the oil‐paper hybrid insulation.In this study,three typical sulfides dibenzyl disulfide,hexadecyl mercaptan and benzothiophene were selected to form seven sulfide‐oil‐paper models.Then relaxation calculations were carried out,and through molecular dynamics simulation,the synergistic effect of different sulfides on the properties of insulating paper and insulating oil was discussed.Results show that the coexistence of the three sulfides has the most severe weakening on the mechanical properties of cellulose,and it also causes great damage to hydrogen bonds.Hexadecyl mercaptan has a weaker effect on hydrogen bond destruction,but it will greatly aggravate the cellulose chain movement.The viscosity of insulating oil is generally increased by the influence of sulfide.Hexadecyl mercaptan is the main factor affecting the viscosity.Thiophene has little effect on the viscosity,ctive protection technology on sulphur corrosion.

关 键 词：corrosion SULFIDE SULPHUR 

分 类 号：TM21[一般工业技术—材料科学与工程]