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In three phase system, the three voltages (currents) differ in phase by __________electrical degrees from each other in a particular sequence.

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In three phase system, the three voltages (currents) differ in phase by __________electrical degrees from each other in a particular sequence.

(a) 30

(b) 60

(c) 90

(d) 120

The question was asked in an internship interview.

My question is taken from Polyphase System topic in section Polyphase Circuits of Network Theory

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Best answer
Right choice is (d) 120

The best explanation: In general a three phase system of voltages is merely a combination of three single phase systems of voltages. In three phase system, the three voltages (currents) differ in phase by 120⁰ from each other in a particular sequence.

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