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Partial discharge
In
electrical engineering
,
partial discharge
(PD) is a localised
dielectric breakdown
of a small portion of a solid or fluid
electrical insulation
system under
high voltage
stress, which does not bridge the space between two conductors. While a
corona discharge
is usually revealed by a relatively steady glow or
brush discharge
in air, partial discharges within solid insulation system are not visible.
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