Hallo Mahmood,



(Attention: DU and I(t) is negative in this calculation, because it represents the discharge of capacitor. In case of charge of capacitor DU and I(t) is postive.)

An example: If Dt = 5msec, accepted voltage DU = -120V (means 10% of initial value) and I = -1200A, then C = 0.05F = 50000µF.

Kai