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Which harmonic is not present in 3-Φ fully controlled rectifier? (a)3^rd harmonic

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Which harmonic is not present in 3-Φ fully controlled rectifier?

(a) 3^rd harmonic

(b) 5^th harmonic

(c) 7^th harmonic

(d) 11^th harmonic

This question was addressed to me at a job interview.

My enquiry is from Motors Rating and Heating in division Rating and Heating of Motors of Electric Drives

1 Answer

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Best answer
The correct choice is (a) 3^rd harmonic

Easiest explanation: Triplen harmonics are absent in the case of 3-phase fully controlled rectifier. Because of the absence of triplen harmonics THD of the rectifier 31%.

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