For a 12 pulse operation, the two 6 pulse units are fed by

1.

For a 12 pulse operation, the two 6 pulse units are fed by

[A].	Y - Y and Y - Y transformers
[B].	Δ - Δ and Δ - Δ transformers
[C].	Y - Y and Y - Δ transformers
[D].	Y - Δ and Y - Δ transformers

Answer: Option C

Explanation:

30° phase difference is necessary.

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