GATE EE 2016 Set 2 — Question 29
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Power Electronics → AC-DC Converters → Uncontrolled Rectifiers (1φ, 3φ)
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Question
A three-phase diode bridge rectifier is feeding a constant DC current of 100 A to a highly inductive load. If three-phase, 415 V, 50 Hz AC source is supplying to this bridge rectifier then the rms value of the current in each diode, in ampere, is _____________.
Correct answer
57 to 58
Solution
In a three-phase diode bridge rectifier, each diode conducts for ( radians) in a full cycle of ( radians). Given the load current is constant at A, the current through each diode is a pulse of height 100 A and duration . The RMS value of the diode current is calculated as:Substituting A:According to the official answer key, the acceptable range is 57.0 to 58.0.
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