Page 70 - Basic PD Theory
P. 70
Flow Charts
A B
PD increase No Higher than No
> 150%? typical? Monitor every 3
months
Yes Yes
Voids near Negative Polarity None
copper predominance of Internal
Classic PD? delamination
Positive
Load Direct
Dependence? Coil/bar
movement
Non-classic PD?
No
Yes
Temperature Direct
Dependence? Grading Coating
Further
investigation
required No
Electrical Slot
Discharge
C
65 | P ag e
