GATE EE 2019 Set 1 — Question 64
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Power Electronics → AC-DC Converters → Controlled Rectifiers (3φ)
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Question
A fully-controlled three-phase bridge converter is working from a , AC supply. It is supplying constant current of at to a DC load. Assume large inductive smoothing and neglect overlap. The rms value of the AC line current in amperes (round off to two decimal places) is _________.
Correct answer
81 to 82
Solution
With large inductive smoothing the DC current is constant at , and in a three-phase fully controlled bridge each thyristor conducts for . The AC line current is therefore a quasi-square wave: for , zero for , for and zero for the remaining .RMS value of the line currentSubstituting :Answer: A
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