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Line to line measure in star connection formula

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nayakajit87

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Dear all

I am trying to 3 phase voltage using microcontroller. I have star connected ckt. Star-and-Delta-Connections-1280x720.jpg

P = 3 x VP x IP x Cos(Φ) or
P = √3 x VL x IL x Cos(Φ)

Line Voltage is root three times phase voltage i.e. VL = √3 VP. Here, VL is Line Voltage and VP is Phase Voltage.

Now assume i have used common phase to Y/B phase what will be relation between VP and Vl.
 

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