What is the power formula for 3-phase Y connected motor. I've read that(adsbygoogle = window.adsbygoogle || []).push({});

P = sqrt(3) Vt*Ia*Cos(theta)

and P = sqrt(3) Vt*E*sin(sigma)/Xs

Where sigma is the the angel between Vt and E

Is that 2 formulas hold true for both delta and star connected 3 phase motor? and if so, Where the sqrt(3) came from?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Power formula for 3-phase motor

**Physics Forums | Science Articles, Homework Help, Discussion**