Partial Discharges in Electrical Insulation
or IEC requirement (unlike all other apparatus) •Some endusers do in-situ off-line PD tests •On-line PD testing is more common •Usually detect PD with capacitors •As with other apparatus, the difficulty with on-line testing is separating stator PD from noise •Note that almost all stator windings >3.3 kV have PD in normal service
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