变压器油中多种活性较强的硫化物与铜导线反应生成硫化亚铜，附着在铜导线和绝缘纸表面，降低油纸绝缘的电气性能而引发绝缘故障。目前国内外针对硫腐蚀现象的研究主要集中在单一硫化物DBDS，对其它硫化物及其协同作用下的绝缘劣化机理研究较少。本项目基于宏观实验研究和微观分子模拟，分析不同硫化物、电压、温度条件下油纸绝缘老化特征参量的变化规律，阐明多种腐蚀性硫化物的反应过程及其相互转化机制，揭示多重化硫腐蚀对油纸绝缘的协同劣化作用机理；提取可定量表征多重化硫腐蚀反应特性的解耦特征量，建立硫化物成分—老化特征参量—硫腐蚀严重程度的数学关联表征模型，提出多重化硫腐蚀严重程度的定量表征方法；研究多重硫腐蚀条件下钝化剂防护的有效性，提出针对不同类型硫腐蚀的钝化剂防护策略与最优添加浓度。本项目研究可深化理解多重化硫腐蚀现象及其协同劣化机制，为预防硫腐蚀绝缘故障提供理论依据与技术手段，具有重要的科学意义和应用价值。

Multiple active sulfides in the transformer oil could react with the copper conductor to form cuprous sulfide, which adheres to the surface of the copper wire and the insulating paper, reducing the oil-paper electrical properties and cause insulation failure. At present, most scholars mainly focused on the corrosiveness of the single sulfide DBDS, while few on other sulfides and their synergistic deterioration effects. Based on the macroscopic experiment and microscopic molecular simulation, the project intends to analyze the change rule of aging characteristic parameters under different sulfide, voltage and temperature, to clarify the reaction process and their mutual conversion of multiple sulfur corrosion. Also, the synergistic deterioration mechanism of the oil-paper insulation by different sulfurs would be revealed. By extracting the decoupling characteristic parameters which can quantitatively characterize the multiple sulfur corrosion degree, the mathematic correlation model of the sulfur compositions, the aging characteristic parameters and the sulfur corrosion severity can be established, also with the quantitative characterization method of the sulfur corrosion severity degree. The protection effectiveness of passivator under multiple sulfur corrosion would be studied and the optimal passivator concentration for different corrosive sulfurs will be proposed. This project has certain scientific significance and application value for further revealing the sulfur corrosion phenomenon and its synergistic degradation mechanism, as well providing theoretical basis and technical means for preventing the sulfur corrosion insulation fault.