Open AccessMicro‐mechanism study on synergistic degradation of the oil‐paper insulation with dibenzyl disulfide, hexadecyl mercaptan and benzothiophene
Author(s) -
Cong Haoxi,
Pan Hao,
Hu Xuefeng,
Zhang Minhao,
Li Qingmin
Publication year - 2021
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve2.12064
Subject(s) - benzothiophene , disulfide bond , sulfide , sulfur , chemistry , transformer oil , chemical engineering , hydrogen sulfide , viscosity , cellulose , corrosion , hydrogen bond , organic chemistry , degradation (telecommunications) , thiophene , materials science , inorganic chemistry , polymer chemistry , composite material , transformer , molecule , biochemistry , physics , quantum mechanics , voltage , engineering , telecommunications , computer science
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.