Measurement of partial discharges in vegetable oil-impregnated insulating system

This paper presents early result of an investigation of partial discharge (PD) properties in vegetable oil-impregnated insulating system. The laboratory experimental investigation simulated common fault conditions in vegetable oil-impregnated paper and pressboard insulating system. PD tests were carried out at elevated temperature to observe possible variation on PD behavior with temperature. In order to investigate the possible differences in measured PD properties, PD data was collected using a PD detector with a variable measurement bandwidth. The experimental results indicated that temperature changes may result in variation of PD properties. The test results also indicated that the measured PD properties also vary with the detector bandwidth.