Question

3 equal coils of inductive reactance 30 ohms and resistance 40 ohms are connected in Star to a 3 phase supply of line voltage 400 volts. CALCULATE the line Current and the Total Power

Answer 1

$Z_p=\sqrt{30^2+40^2}=50\ (\Omega)$

$V_p=400/\sqrt{3}=231\ (V)$

$I_L=I_p=V_p/Z_p=231/50=4.62\ (A)$ . Answer

$S=\sqrt3V_LI_L=\sqrt3\cdot400\cdot4.62=3201\ (W)$ . Answer