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Third lowest order harmonic present in 3-Φ fully controlled rectifier is __________

(a) 11^th

(b) 17^th

(c) 13^th

(d) 22^nd

I had been asked this question in final exam.

Origin of the question is Solid-State Devices topic in portion Introduction to Solid-State Devices of Electric Drives

1 Answer

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Right answer is (a) 11^th

Easy explanation: Only 6k±1 order harmonics are present in 3-Φ fully controlled rectifier. The lowest order harmonic is 11^th harmonic for k=2. Third order harmonics are absent in 3-Φ fully controlled rectifier.

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