Calculating Neutral Current in Three-Phase Unbalanced Systems

[Miki Abe]

How to culculate neutral current in three phase system with unbalance load?

 

[dlgoff]

For balanced loading on a 3-phase, 4-wire wye system like this,

the vector diagram would looks like this:

Now follow this Basics of Vector Analysis.

Now for unbalanced loading on a 3-phase, say like this,

the vector diagram would look like this, since there's no C Phase (definitely unbalanced :D):

Now follow this Vector Analysis.

Good Luck