Page 14 - PD Experience on 3-5kV
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3.9.4 PD Pattern
Failure mechanism Polarity Load Effect Temperature Effect Phase Location
Variable
Gap-type Discharges No predominance None Unpredictable (“Cloud”) or
“rabbit ears”
Failure mechanism Symptoms Detection Tests Machine types
PD, white powder,
Inadequate cable insulation PD, visual inspection Switchgear, motor
spacing leads
discoloration
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12 | P age
