Question

Calculate the line voltage in star connection when phase voltage=315 V.

(a) 545.5 V

(b) 548.6 V

(c) 547.8 V

(d) 585.8 V

I have been asked this question in an internship interview.

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Answer 1

Right answer is (a) 545.5 V

To elaborate: The line voltage in the case of star connection is 1.73 times of phase voltage. It leads the phase voltage by an angle of 30°. VL-L=1.73×315=545.5 V.