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A step-down delta-star transformer, with per-phase turns ratio of 5 is fed from a 3-phase 1100 V, 50 Hz source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding feeding an R load. Find the average value of output voltage.

Correct Answer: 257 V
Vph = 1100/5 = 220 V (Transformer ratio = 5) Vmp = √2 x 220 V Vo = 3√3/2π x Vmp = (√2 x √3 x 3 x 220)/(2 x π).

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