The investigation of copper sulphide effect on paper impregnated oil

Recently, a new failure mode has been discovered in kraft paper, which is associated with corrosive sulfur, due to Dibenzyl Disulfide (DBDS) contamination. Simple tests using cylinder-to-plane electrode models were devised to highlight the presence of copper sulphide on paper surface. The purpose of this paper is to investigate the effect of copper sulphide through Partial Discharge (PD) measurement having behavior specifically associated with this type of pollution. The tendency of increasing of copper sulphide deposition on kraft paper insulation was found to be inversely proportional to the Partial Discharge Inception Voltage (PDIV). Breakdown Voltage (BDV) and Dielectric analysis were also considered to achieve a complete understanding of the influence of copper sulphide deposition on paper.