Size of capacitor for improvement of the Power Factor from Cos ø1 to Cos ø2 is:
Required size of Capacitor (Kvar) = KVA1 (Sin ø1 – [Cos ø1 / Cos ø2] x Sin ø2)
Where KVA1 is Original KVA.
Optimum location of capacitors
L = [1 – (KVARC / 2 KVARL) x (2n - 1)]
Where:
L – distance in per unit along the line from sub-station.
KVARC – Size of capacitor bank
KVARL – KVAR loading of line
n – relative position of capacitor bank along the feeder from sub-station if the total capacitance is to be divided into more than one Bank along the line. If all capacitance is put in one Bank than values of n=1.
KVARC – Size of capacitor bank
KVARL – KVAR loading of line
n – relative position of capacitor bank along the feeder from sub-station if the total capacitance is to be divided into more than one Bank along the line. If all capacitance is put in one Bank than values of n=1.
Voltage Rise due to Capacitor installation:
% Voltage Rise = (KVAR(Cap) x Lx X) / 10 x Vx2
Where:
KVAR (Cap) – Capacitor KVAR
X – Reactance per phase
L – Length of Line (mile)
V – Phase to phase voltage in kilovolts
X – Reactance per phase
L – Length of Line (mile)
V – Phase to phase voltage in kilovolts
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