What is the difference between the Kvar and Farads?

[tinku123]

hello every one,

what is the difference between the Kvar and farads, Rating on Power capacitor is for eg: x kvar, and normal capacitor is eg: x farads.

what is the relation between these two?

regards
tinku123

 

[Ghitani]

kvar farad

KVAR : stands for Kilo Volt Ampere Reactance , used to measure maximum reactive power (imaginary) that can the capacitor stands

Farad : unit of measuring the capacitance of the capacitor

No relation between them !

For power capcitors the 2 values are high .

 

[tinku123]

kvar to farads

thanx for replay

but i want to find how much capacitor value is required to compensate 1KVAR of Reactive power.

regards
tinku

 

[jonw0224]

farad to kvar

tinku,

Depends on your source voltage and frequency.

VAR = reactive power = V*I (for a capacitor)

For a capacitor in a steady state AC circuit, V = I/(jwC) = I/(2*pi*f*C) or I = 2*pi*f*C*V

Substituting, then

VAR = C*(2*pi*f*V^2)
kVAR = VAR / 1000

Hope that helps!

-jonathan