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Which harmonic is not present in 3-Φ fully controlled rectifier?(a) 81st harmonic(b) 15^th harmonic(c) 17^th harmonic(d) 11^th harmonicI had been asked this question by my college director while I was bunking the class.The question is from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

Right CHOICE is (a) 81st harmonic

For 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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