Very-Fast-Front Overvoltage, VFFO IEEE and IEC
Transient overvoltage usually unidirectional, with time to peak < 0,1 µs, and with or without superimposed oscillations at frequency 30 kHz < f < 100 MHz
Transient overvoltage usually unidirectional, with time to peak < 0,1 µs, and with or without superimposed oscillations at frequency 30 kHz < f < 100 MHz