The neutral current in a three-phase circuit with phase currents of 12A at unity power factor, 20A at 0.8 lagging power factor, and 20A at unity power factor can be calculated. A power factor of 0.8 corresponds to a 37 degree lag between the current and voltage.

1. Example 2
What is the value of the neutral current in a
three-phase circuit in which;
IR =12 A at unity power factor
IW = 20 A at a power factor of 0.8 lagging and
IB = 20 A at unity power factor

2. Power factor (pf) = cos Φ
So,0.8 lagging corresponds to
37° of lag