(1) PD current pulse waveform becomes larger and steeper
with the elapse of time.
(2) PD generation was not continuous, but intermittent
from PD inception to BD.
(3) Time transitions of di/dt, q and J were almost consistent
with that of peak value I.
(4) Time transitions of tr
and tf
were not consistent with
that of peak value I.
(5) Polarity difference in each PD parameter was not
significant.
(6) Accumulated PD energy Ja
gradually increased and
reached about 240 μJ, in this sample, just before BD.