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Question

A 3ϕ full wave controlled converter is fed from 3ϕ ,400V, 50Hz source and connected to highly inductive load with load resistance of 12 Ω. If the firing angle delay is α = 45°, the rms value of source current will be

A
24 A
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B
26A
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C
21.5A
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D
23.5A
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Solution

The correct option is B 26A
As firing angle, α<60°

Average output voltage,

V0=3Vmlπcosα

=3×400×2πcos45°=381.97 V

I0=V0R=381.9712=31.83A

Is=23I0=23×31.83=25.99 A

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