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Which of the following voltage is a phase voltage in the delta connection?

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Which of the following voltage is a phase voltage in the delta connection?

(a) VRN

(b) VBR

(c) VYN

(d) VBN

I have been asked this question in an internship interview.

The above asked question is from Inter Connection of Three-Phase Sources and Loads topic in portion Polyphase Circuits of Network Theory

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Right choice is (b) VBR

To elaborate: A balanced three phase source is one in which the three individual sources have equal magnitude with 120^ phase differences. VBR is a phase voltage in delta connection. And VRN, VYN and VBNare not phase voltages.

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