SHI Wen, YANG Zhengli, HUANG Qixin, et al. Development Features of Ultrasonic Partial Discharge of Metal Point Defect with Different Lengths in GIS[J]. High voltageapparatus, 2018, 54(11): 80-85.
SHI Wen, YANG Zhengli, HUANG Qixin, et al. Development Features of Ultrasonic Partial Discharge of Metal Point Defect with Different Lengths in GIS[J]. High voltageapparatus, 2018, 54(11): 80-85. DOI: 10.13296/j.1001-1609.hva.2018.11.010.
Gas insulated switchgear(GIS)may contain metal point defect on high-voltage conductors during manufacturing or installation
and the defect may cause partial discharge(PD)during GIS operation. Continuous PD maylead to insulation breakdown and affect equipment operation. Aiming at the PD characteristics of metal point defecton GIS high-voltage conductors
this study set metal point defects of different lengths on the high-voltage conductorsof a real GIS. The PD signals from initial discharge to insulation breakdown were measured by the ultrasonic method
and the results show that with the increase of voltage
the PD process can be divided into PD initial stage
PD phaseconversion stage
PD development stage and critical insulation breakdown stage. The defects of different lengths have similar development stages
but their PD inception voltages and discharge intensities are different.