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Partial discharges(PDs) due to artificial void in samples of LDPE nanocomposite sheet have been investigated in this work.PDs may cause the degradation of insulating materials and may affect the lifetime of high-voltage apparatus. An experimental work using sphere ball-plane electrode system(CIGRE MethodⅡ) and a 1.0 mm LDPE composite sheet was carried out.Different weight percentages of nanosilica(0%,2%,4%,6%and 8%) were used. PD experimental results,such as PD magnitude and PD number(both PD pulse polarities),as functions of the applied stress duration at a specified applied voltage were compared.The surface morphology of specimens was also presented and this conforms to the PD findings.The experimental results show that the PD characteristics of the LDPE generally improve with the introduction of nanosilica,the composite with the highest content of filler,namely the 8%(wt) nanosilica sample has the least partial discharge activities.
Partial discharges (PDs) due to artificial void in samples of LDPE nanocomposite sheets have been investigated in this work. PDS may cause the degradation of insulating materials and may affect the lifetime of high-voltage apparatus. An experimental work using sphere ball-plane electrode (CIGRE Method II) and a 1.0 mm LDPE composite sheet were carried out. Different weight percentages of nanosilica (0%, 2%, 4%, 6% and 8%) were used. PD experimental results, such as PD magnitude and PD number of both PD pulse polarities, as functions of the applied stress duration at a specified applied voltage were compared. The surface morphology of specimens was also presented and this conforms to the PD findings. the experimental results show that the PD characteristics of the LDPE generally improve with the introduction of nanosilica, the composite with the highest content of filler, namely the 8% (wt) nanosilica sample has the least partial discharge activities.