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The Ultra High Frequency (UHF) signal radiated during the surface discharge process under harmonic AC voltages with different Total Harmonic Distortion (THD) shows a dominant frequency at 0.8 GHz. The surface discharge inception voltage decreases with an increase in harmonics and THD as observed in the present work. The peak factor of the harmonic voltage and the surface discharge inception factor...
This paper discusses the chemical and dielectric methods of analysis of aging of paper oil insulation due to copper corrosion which occurs in presence of reactive and corrosive sulphur in transformer oil. Results of Chemical Analysis and dielectric measurements are presented and discussed for understanding the usefulness of these methods in arriving at a comprehensive method to explain the effects...
Failure of transformers and reactors due to sulphur in transformer oil is reported in literature. The sulphur in oil by chemical reaction with copper produces copper sulphide which alters the electric field. One of the mitigation techniques followed by manufacturers is replacement of bare copper conductors with enameled copper conductors. In this study, an attempt is made to understand field distribution...
The role of Mercaptans in causing copper corrosion is investigated and discussed in this paper. The performance of transformer oil samples has been investigated by conventional accelerated thermal-electrical ageing of paper oil insulation. Discharge measurements have been carried out using PD technique and variation of statistical parameters of discharges due to deposits of copper sulphide in between...
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