Apparent power generator-side

In an electric circuit, instantaneous power is the time rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow.

In order to feed a purely resistive load in a radial network with a given current through an underground line, it is necessary to inject a higher current at the source to compensate for cable capacitance with the difference being the capacitive current generated in the line.

$\sqrt{3} U_o I_c$three-phase system
$U_o I_c$two-phase system
$U_o I_c$single-phase system
Used in