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In a 3-phase rectifier circuit, thyristor number 1, 2 and 3 are connected respectively to R, Y and B phases of the star-connected transformer secondary. When the current is being commutated from thyristor No. 1 to No. 2, the effect of the transformer leakage and the ac system inductance will be such that it will
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- prolong the conduction in No. 1 and delay the turn-on of No. 2 correspondingly
- stop the conduction in No. 1 at the scheduled time, but delay the turn-on of No. 2
- produce conduction in both No. 1 and No. 2 in parallel for an overlapping period through a transient
- double the voltage output through a commutation transient
Correct Option: C
A line commutated converter operates, in the rectifying mode converting ac to dc for the first 0° to 90° to 180°. When the dc voltage is negative, power flow is from dc to ac and the converter functions as inverter. As dc power is fed back it is real power.
