Abstract

2-6-Di-tertiary-Butyl-Para-Cresol generally called DBPC and Dibenzyl Disulfide called DBDS are oxidation inhibitors used in transformer oil by the manufacturers. The transformer accidents caused by corrosive sulphur have occurred repeatedly, and caused great loss to the power grid. The source of corrosive sulphur is the transformer oil. It is formed by the reaction of both DBDS and DBPC, resulting in copper-sulfide deposition on the insulation paper. It degrades the insulation strength of paper and leads to reduced dc resistance and increased leakage current. The increase in the concentration of DBDS and DBPC increases the formation of copper sulfide leading to insulation failure. In present work, the effect of DBDS and DBPC on leakage currents and dc resistance and hence on dielectric characteristics have been studied.