Wednesday, September 25, 2013

An inductor is connected in series with SCR to protect it against

An inductor is connected in series with SCR to protect it against

A. damage due high dv/dt
B. damage due to high di/dt
C. damage due to large forward current
D. none of these

Explanatory answer :

An inductor is connected in series with SCR to protect it against damage due to high di/dt

At the instant of turn on, the current flowing through SCR is not distributed uniformly and the rate of rise of current (di/dt) is very fast.This produces localized hot spots and damages the device,hence SCR should be protected against this high di/dt. This can be achieved by connecting an inductor in series with the SCR, because inductance(L) opposes the high di/dt variations. 


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