Current study of passivator protection is mainly focused on single type of sulfur. In this paper

the different protective effects of different passivators and the influence of passivators on oil quality under the condition of multiple corrosive sulfur were discussed. The running oil stemming from the substation in Shuikou Fujian

which contains various corrosive sulfides

was applied to the accelerated aging tests under the premise of 150 ℃. The passivator effectiveness of TTA

Irgamet 39

and T571 in coexistence of various corrosive sulfurs was verified. Moreover

the optimum concentration of three passivators was obtained. In additi

on

the breakdown voltage

dielectric loss factor

volume resistivity and moisture content with the new oil and the running oil were measured. Results show that the protection effectiveness of TTA is the best among the three passivators

and the copper plate can be well protected by erosion at 50×10

-6

. The others can not completely protect the copper even if the concentration reaches 200×10

-6

which can only delay the erosion of copper plate. The influence of addition of Irgamet 39 on the breakdown voltage

dielectric loss factor

volume resistivity and oil moisture is least

followed by T571 and TTA. Being difficult to dissolve in the oil

TTA has a great impact on the oil quality even after being fully mixed. After the influences of passivators on the oil quality and the economics are taken into consideration

it is recommended to add 100×10

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concentration of T571 into the transformer oil after some operation time to prevent the corrosive sulfur problem.