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What is relation bet kvar & microfarad

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What is relation bet kvar & microfarad..

The small capacitors used in electronic circuits, or with
single-phase motors, are always rated in capacitance units,
capacitors, used for motor surge protection, are also rated
that way. But the large capacitors for power factor
correction are rated in kilovars.
Why the difference and how are the two rating systems
related?

Units intended to add specific capacitance to some circuits
are rated in capacitance units. Analysis of circuit
behavior involves formulas that directly include
capacitance, inductance, and resistance. This applies to
the smaller units, particularly in electronic circuits, and
to surge protection.
For power factor adjustment or voltage stabilization on a
power circuit, system analysis calculations involve amounts
of reactive volt-amperes and watts, making it more
straightforward to rate such capacitors in kvar units. The
two kinds of rating are related by this formula:
kvar = 0.377(C)(kV)^sup 2^
in which C is the capacitance in microfarads and kV is the
voltage applied to the capacitor in kilovolts. One kvar at
460 volts=12.54 microfarads; at 2300 volts, 0.502

 Is This Answer Correct ? 30 Yes 10 No

What is relation bet kvar & microfarad..

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

 Is This Answer Correct ? 9 Yes 3 No

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