# Calculation single phase and three load connected at the same time to three phase network

I have a single phase load (90 A 230 V) and 2 three phase loads (7 kW 400 V 3 phase/9 kW 400 V 3ph+N) connected at the same time to a three phase network.

How the 3 phase calculations (line current of each load, total line current) done in this case?

Are there any documents you recommend?

Obviously the single phase load draw 90 A from the line W.

For the three phase load 7 kW the current drawn by each line is:

I(U,V,W)= (7000)/(400*sqrt(3)*0.8) = 10 A

For the three phase load 9 kW the current drawn by each line is

I(U,V,W)= (9000)/(400*sqrt(3)*0.8) = 16.2 A

Total current drived by each line:

IU=10+16.2=26.2 A

IV=10+16.2= 26.2 A

IW=10+16.2+90= 116.2 A

• Imagine the single phase load wasn't connected at all. Do you know how to do the 3-phase analysis? Then if only the single phase load were connected, do you know how to perform the single phase analysis? Please demonstrate that in your question. Commented Dec 14, 2022 at 21:04
• (Why consider the three-phase loads separately? Where do you get PF from?) Commented Dec 15, 2022 at 8:16
• PF power factor = 0.8 Commented Dec 15, 2022 at 12:18
• (10 A / 7) * 9 ≠ 16.2 A Commented Dec 15, 2022 at 21:34