Discussion
In high voltage SCR based applications Gate control circuit of SCR prefer fibre optical cable for triggering purpose, because :
Answer: C
Fibre optic triggering is preferred because it provides a very high level of insulation/isolation.
In high voltage applications such as HVDC valves, SCRs sit at potentials of many kilovolts above ground, while the gate control electronics are near ground. An optical fibre carries the trigger pulse as light, and since glass does not conduct, it isolates the control circuit completely from the high voltage. It is also immune to electromagnetic interference.
An optical fibre carries a signal, not power, so it does not provide low impedance, gain or high current for the power circuit.
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