Sensing the Partial Discharge in High Voltage Transformers

Considering the number of failures in high voltage ' power transformers caused by problems in bushing and winding insulation, it is important to study means for diagnosing incipient failures, to avoid long unavailability periods and its consequences. The aim of this study is to study investigation and measurement procedures, concerning the evaluation of position of partial discharge inside the transformer, in order to evaluate the degree of danger for the equipment. The methodology is based on a noninvasive measurement of partial discharges from the transformer bushing. The position of the partial discharge source is investigated considering the winding model in transformer, and the measurement of the response to the pulses of partial discharge waveform.