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Partial Discharge Pulses at Artificial Protrusions in SF6 under Negative IEC60060-3 Standard Impulses

Protrusion defects on conductor in gas insulated switchgear (GIS) formed by manufacture, transportation, installation or operation can seriously degrade the withstand voltage strength. Partial discharge (PD) test under ac voltage is sometimes ineffective for this type of defect in practice. Thus, we carried out PD measurements for protrusion defects under four types of standard impulse voltages and explored some basic behaviors and characteristics of PDs, which could provide some guidance on impulse PD test which may be used as a more stringent measure in the future field test.