kV (kilo-Volt) is the potential difference between two points, or more conventionally, two lines that carry electric current. In distribution, it is an indication of the power the line carries. For higher power lines, you want as little current I to flow to dissipate in a constant line resistance R, so you increase the voltage V whilst reducing the current I (by means of a high voltage transformer) to maintain a constant apparent power V*I, which is measured in kVA.
So, kVa: apparent power (including the current not dissipated in resistive loads), kW: real power dissipated, and kV: the voltage on the line that feeds the load.
67 mths ago