Effect of DBDS on DC Resistance of paper oil insulation system

A number of power transformer failures occur due to the addition of DBDS compound in transformer oil. When DBDS reacts with Cu, it results in the breakdown of DBDS and thus pawing way to the formation of CU₂S. The CU₂S on the surface of the copper conductor migrates from one layer to another layer of insulation papers (Kraft papers) and this results in lowering of dielectric strength and thus electrical faults occur. The metal passivators such as Irgamet 39™, Benzotriazole (BTA-Aldrich) and 6Bis-(1-methyl-1-phenylethyl) Phenol (BMPEP-Aldrich) can be used to suppress the formation of copper sulfide. This addition of metal passivators to oil does not reduce or eliminate DBDS [1-6]. In this paper the effect of DBDS on DC Resistance of paper oil insulation system has been studied Experimental study has been carried out to describe the role of DBDS in fall of DC Resistance of paper-oil insulation of transformers. Different quantities of DBDS were added with pure transformer oil and the effect it will have on dc resistance under different applied voltages for different time intervals have been compared and contrasted.