Transformer insulating oils often contain corrosive sulfides

which can cause damage to the oil-paper insulation systems and induces partial discharge. In order to study the effect of corrosive sulfides on the partial discharge of transformer oil paper insulation

a variety of corrosive sulfides（dibenzyl dithiol

dibenzyl sulfide and lauryl dodecyl mercaptan） were used to contaminate transformer oil under laboratory conditions. The oil and wind samples were placed in a vacuum aging chamber and accelerated thermal aging tests were performed at 140 °C. Samples were periodically taken for partial discharge testing and relevant characteristic parameters were collected. The results show that: The specimens that have been contaminated by corrosive sulfides have high partial discharge intensities. As a whole

the discharge parameters increase as the concentration of S elements increases. The effect of the combination of different sulfides on the discharge process is different. According to the analysis

during the sulfur corrosion

different sulfides also work with the different stresses in the environment to degrade the insulation performance of the oil paper samples

under different sulphides

there are differences in the dielectric strength of different parts of the group

the development of partial discharge is different.