Question

An SCR has half-cycle surge current rating of 3000 A for 50 Hz supply. One-cycle surge current rating of thyristor is

Answer 1

Let I and $I_{sb}$ be the one cycle and sub cycle surge current rating of SCR respectively.
Equating the energies involved in them, we get,

$I^{2}T=I_{sb}^{2}t$
$I^2\times \frac{1}{100}=(3000{)}^2\times \frac{1}{200}$
$I^2=\frac{{3000}^2}{2}$
$I=2121.32$ A