Note that the terms “leading” and “lagging”
refer to the current leading or lagging the voltage.
The current to induction motors will lag, and the
motor will draw magnetizing current from the
system. Leading P.F. synchronous motors feed
magnetizing current to the system. As shown in
Figure 12, lagging currents are treated as negative,
leading as positive.
kVAR = kVA2
-kW2
kVAR = kW x Tan (θ)
(where θ is the angle in degrees, by which the current differs from the voltage.)
kW = kWH/H
Motor rated kVA = 0.746 x HP
Eff. x P.F.