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To calculate the one-cycle surge current rating from the half-cycle surge current rating of an SCR, you typically multiply the half-cycle rating by a factor of √2 (approximately 1.414).
Given:
– Half-cycle surge current rating = 3000 A
One-cycle surge current rating = Half-cycle surge current rating × √2
= 3000 A × 1.414
≈ 4242 A
Therefore, the one-cycle surge current rating is approximately 4242 A.
Answer: b
Explanation: By equating the energies involved in one cycle & subcycle
I
2
.T = Isb2
.t
Isb = 3000 A
T = 1/50
t = T/2.