Abstract
Premature death of power and converter transformers as a result of formation of Corrosive elements on copper conductors due to sulpher in transformer oil is a serious phenomenon that is haunting power industry over the years. Addition of Dibenzyl disulphide (DBDS) by the manufacturers of transformer oil, so as to increase the performance characteristics of transformer oil is one of the reasons for formation of copper sulphide. Copper sulphide being conductive, affects the voltage distribution due to surface discharges. The insulation is damaged due to these discharges and leads to the breakdown of insulation. In the present work experimental analysis has been carried out to investigate the role of DBDS in increasing the discharge activity and thus reduction in breakdown strength of transformer insulation.
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