GATE 2016 EE (EE2) – Question 29

Power Electronics · Single and three-phase configuration of uncontrolled rectifiers · 1 mark · Numerical answer

A three-phase diode bridge feeds constant 100 A DC into a highly inductive load from a 415 V, 50 Hz source. Rms current in each diode, in amperes, is ________.

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Correct answer: 57.0 to 58.0

Explanation

With continuous DC current, each diode carries 100 A for 120° of every 360° cycle and zero otherwise.

Its mean square is $100^2(120/360)=10000/3$. Taking the square root gives **100/√3=57.735 A**, within 57–58 A.

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