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Technically, VArs are the product of the rms voltage and current, or the apparent power, multiplied by the sine of the phase angle between the voltage and the current. Or in mathematical terms, the reactive power Q, (measured in units of volt-amperes reactive or VAr), is given by. Q = Vrms * Irms * sin(Ï)
Negative VAR flow at the generator occurs when the excitation of the generator is reduced below the point at which the generator terminal voltage is equal to the AC electrical grid voltage.his is also called over-excitation; most generators are built to provide VARs to assist with voltage support on the electrical grid. Decreasing excitation below that required to maintain generator terminal voltage equal to the electrical grid voltage causes VARs to flow into the generator.