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Progressive formation and migration of copper sulphide in paper oil insulation has been studied using Frequency domain spectroscopy and real/imaginary part of complex permittivity. Two specimen configurations namely pigtail sample and laboratory model transformer have been used for understanding the performance of paper oil insulation under conditions of copper corrosion. It is observed that both...
This study presents the FEM (Finite Element Method) results of electric stress analysis of copper sulphide contaminated paper insulation of transformers. This analysis is based on conductivity and permittivity changes that occur due to penetration of copper sulphide into paper. The differences in the two models based on conductivity and permittivity and their effect on electric stress distribution...
This study was taken up to understand the variations in concentrations of metal passivators like Irgamet 39 and BTA which are added to mitigate the effects of corrosive sulphur in mineral oil. The study has shown that both BTA and Irgamet 39 are effective in arresting the formation of copper sulphide on conductors. The effect of thermal ageing of oil in presence of reactive species like MBT and DBDS...
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