DBDS, dibenzyl disulfide, is associated with corrosive sulfur behavior in some mineral oils. Under certain conditions it can contribute to the formation of conductive copper sulfide on paper insulated conductors, which increases dielectric stress and can lead to failures. Utilities manage this risk through screening tests for corrosive sulfur, use of passivators where appropriate, careful oil selection, and monitoring of sulfur related indicators. Industry guidance often references dedicated test methods and interpretation practices for corrosive sulfur risk, because the problem is chemistry and temperature dependent rather than purely electrical.
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