Micromechanism of Protective Effect of Metal Passivator against Multiple Sulfides in Power Transformers
At present,there are few studies on the optimal additive concentration of passivator and the protective effectiveness of oil-paper insulation system containing multiple sulfides.Therefore,the passivator methylbenzotriazole(TTA),which was widely used,and three typical sulfides,dibenzyl disulfide,cetylmertan and benzothiophene,were selected and simulated by reaction molecular dynamics.By measuring the van der Waals energy,molecular chain movement(MSD),elastic modulus and hydrogen bond number,the protective effect of TTA with different mass fractions on multiple sulfides was studied.The results show that TTA passivating agent can effectively protect the transformer oil-paper insulation system containing multiple sulfides,and can block the reaction of sulfide and copper to a certain extent,and effectively delay the aging rate of oil-paper insulation.For insulating oil,before the mass fraction of passivating agent TTA is 150 × 10-6,the protective effect increases with the increase of passivating agent content.However,after 150 x 10-6,the aging of insulating oil is accelerated to a certain extent due to the solubility of TTA,but the aging rate is still lower than that of the blank control group.For insulating paper,the protective effect increases with the increase of passivating agent content,and TTA has no effect on the mechanical properties of insulating paper.From the perspective of comprehensive economy and protective effect,the best protective mass fraction of TTA is 50 × 10-6.
transformeroil paper insulationpassivating agentmolecular dynamicsprotective effect
万方数据
维普
