Classification of transient over voltages

Classification of transient over voltages:

Transient over voltages can be classified into two broad categories:

o  Impulsive transient

o   Oscillatory transient

1. Impulsive transient:

^ü   An impulsive transient is a sudden non power frequency change in the steady state condition of the voltage or current waveforms that is essentially in one direction either positive or negative with respect to those waveforms.

2. Oscillatory transient:

^ü   A sudden, non power frequency change in the steady state condition of voltage or current that is bidirectional in polarity.

^ü   An oscillatory transient is a sudden non power frequency change in the steady state condition of the voltage or current waveforms that is essentially in both directions positive and negative with respect to those waveforms.