Impulse IEEE and IEC
Unidirectional wave of voltage or current which, without appreciable oscillations, rises rapidly to a maximum
value and falls, usually less rapidly, to zero with small, if any, excursions of opposite polarity.
NOTE The parameters which define a voltage or current impulse are polarity, peak value, front time and time
to half-value on the tail.
Related terms: Surge arrester,
SPD