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Instantaneous power in the 3-φ system is constant.

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Instantaneous power in the 3-φ system is constant.

(a) True

(b) False

This question was posed to me in an interview for internship.

My enquiry is from Regenerative Braking of DC Series Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

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Right answer is (a) True

Easiest explanation: The 3-φ system is more economical than 2-∅ system because of no vibrations in power waveform. The instantaneous power in the 3-∅ system is constant. P=3VpIpcos(φ)=√3VLILcos(∅).

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