Answer / ravi teja

for 3-ph system
Kvar=Sqrt(3)*v*i*sin(phi)
or Kvar=kw*tan(phi)

and for value of capacitance when kw or kvar is known

c=KVAR/(2*3.14*f*v^2) when capacitors are connected in Star

c=KVAR/(6*3.14*f*v^2) when capacitors are connected in Delta

I think the above information is in line with your question

If u want any further details mail me @ raviteja.vaka@gmail.com

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