GATE Electrical Engineering (EE) 2019 Solved Paper

Question : 12 of 65

Marks: +1, -0

A six-pulse thyristor bridge rectifier is connected to a balanced three-phase,

50 {Hz}

AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current is

Solution:

Six pulse thyristor bridge rectifier. It is

3-ϕ

full wave bridge rectifier. If output current is constant, then input supply current is quasi square wave. The line current is free from triple

{n}(3 {n})

harmonics i.e

3,9,6 . . .

Lowest order harmonic

=5th

=5 × 50=250 {Hz}

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