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damping out ‘ringing’ which is oscillation of C1 with the circuit inductance during commutation. All
the SCRs connected in series should be turned-on at the same time when signals are applied to their
gates simultaneously.
String efficiency =
This phenomenon increases the reliability of the string, but reduces the utilization of each SCR. Thus
string efficiency decreases. Reliability of string is measured by derating factor (DRF) which is given
by the expression
DRF = 1- string efficiency
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