矿物绝缘油中腐蚀活性较强的硫化物已被证实会诱发油浸式电力设备绝缘故障，在绝缘油精炼过程中会被去除。部分非活性硫因其高效抗氧化性保留于矿物绝缘油中以提高油品的氧化安定性。然而，非活性硫在油浸式电力设备运行条件下的活化问题及其对绝缘性能造成的影响并未得到关注。因此，本项目首次聚焦油纸绝缘中非活性硫的活化机理及影响因素。首先，采用材料物相检测手段及量子化学分析等，从微观分子层面探究非活性硫的活化产物、活化路径及反应机理；其次，结合油浸式电力设备的运行及故障条件，进一步从理论上分析油纸绝缘中非活性硫的活化条件，并对理论分析进行试验验证；最后，考虑从阻断非活性硫活化反应路径与吸收活化所需能量两个方面入手，探索阻断或抑制非活性硫活化的方法。项目研究成果将有助于认识非活性硫在油纸绝缘运行环境下的活化机制，为进一步抑制硫腐蚀的方法选择提供理论及实验依据，具有重要的理论和工程价值。

Strong corrosive active sulfur in the mineral insulating oil has been considered to be the main culprit to induce the insulation failures of oil-immersed power equipment. In order to protect the oil-paper insulation from sulfur corrosion, active sulfur is cleared in the refining process of crude oil. Some inactive sulfur with high antioxidant is still retained in the mineral oil to improve the oxidation stability of oil. However, the activation of inactive sulfur under the operating condition of oil-immersed power equipment and its effect on the insulation properties of oil-paper insulation are not gained attention. This project is aimed to study the activation mechanism and influential factors of inactive sulfur in oil-paper insulation. At first, Material analysis and detection methods and quantum chemical analysis are used to investigate the activation product, activation pathway and activation mechanism of inactive sulfur from the microscopic molecular level. Secondly, combined with the operation and fault conditions of oil-immersed power equipment, the activation conditions and influential factors of inactive sulfur in oil-paper insulation were further analyzed in theory, then the experimental research is conducted to verify the theoretical analysis. Finally, the inhibitory methods for the activation of inactive sulfur are explored by blocking the activation pathway and absorbing the energy required for activation. The above work will contribute to illuminate the activation mechanism of inactive sulfur under the operating condition of oil-paper insulation and provide theoretical and experimental basis to further inhibit the sulfur corrosion, which is of great value in theory and engineering.