Model Based Experimental Determination of Moisture Content in Oil-Paper Insulation System Using FDS Technique

Power Transformers are significant links between HVAC/HVDC transmission systems for changing the life of such aged transformers. Sometimes failure of power transformers may lead to failure of entire power grid. At present, there is large number of transformers being operated towards end of their working life. The main challenge for the High voltage substation maintenance engineers and asset managers is to extend useful life of transformers to avoid major catastrophic failure in them & resulting grid failures. A prorated model of transformer is prepared and tests were carried out. The model was subjected to accelerated aging with high voltage stress. This accelerated aging was followed by PDC test was carried out in frequency domain known as frequency domain spectroscopy (FDS). In this paper Polarization and Depolarization Current measurement (PDC) technique is applied to determine moisture content of a HV coil Model.