3 phase 4 wire Neutral Calculation.

[Andy1]

Hi all,

Im still in apprentice stages of becoming a sparky and currently learning allot about 3 phase at college the moment. Can anyone share their knowledge with me on how to correctly calculate the Neutral current on a 3 phase 4 wire star system when there is an imbalance between phases

e.g L1 = 50 amps, L2 = 40amps, L3 = 30amps?

Im a bit unsure on the correct way to calculate the Neutral current.

Thanks for your time and help.... Please be gentle I'm still learning


Andy.

 

[Sintra]

 

[Knobhead]

In=√((Ia²+Ib²+Ic²)-((Ia*Ib)+(Ia*Ic)+(Ib*Ic)))