Corrosive sulfides in transformer oil could react with copper wire to produce cuprous\nsulfide, causing insulation failure. At present, both the quantitative measurement method and\ndistribution of sulfur components in operating oil are not clear yet. In this paper, the existing\ntypes and contents of sulfides in oil samples with different alkyl groups and different voltage\nlevels were investigated. With quantitative testing methods, the distribution of sulfur composition\nin the operating oil was analyzed. Results showed that the thiophene sulfide in transformer oil\nexisted mainly in the form of benzothiophene with an unsaturation of 6 and dibenzothiophene\nwith an unsaturation of 9. The content of monosulfide sulfide with unsaturation of 3 or 6 was the\nhighest. The disulfide existed basically in the form of Dibenzyl disulfide (DBDS). The influence of\nsulfides on the oil quality were analyzed on this basis. Results showed that the existence of sulfides\nwould increase the moisture content in oil. The absorbed moisture could cause the decrease of the\nbreakdown voltage and rise of the dielectric loss. The above study could provide some engineering\npractice for understanding the sulphide distribution in transformer oils and further prevent the sulfur\ncorrosion faults.
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