If circuit turn off time is lesser than device turnoff time excess charge carriers are still present in the device .The next operation to turn on the SCR if anode +ve w.r.t. cathode,SCR will turn on before the gate signal is given.Here the SCR is losing forward blocking capability and behaving as a diode ..is called commutation failure.
Jagan Rampalli Completed M.Tech in power electronics from JNTUH .Having 6 years of experience in teaching field for the engineering students.and a GATE COACH.
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