voltage impulse
the transient voltage wave applied to a line or an equipment, characterised by a rapid increase, followed generally by a slower non-oscillatory decrease of the voltage
GRM: n.
References:
SEE front of a voltage impulse
SEE tail of a voltage impulse
SPE impulse chopped on the tail
SPE voltage surge
SPE Impulse chopped on the front

ENERGY TERM COURTESY OF ENERGY.EU