Answer / dhanesh koshti

Capacitor calculation is depends on load. if 630 KVA transformer is loaded fully with load p.f.=1 then no compansation is required but if the same is fully loaded with load p.f. = 0.8 then, kvar required is calculated as below:
KVAR = KW ( tanǾ1-tanǾ2); Ǿ1=old p.f.angle, Ǿ2=new pf angle

= 504 ( 0.75 - 0.14) [ here, KW=504 because, 630 X 0.8 = 504]
= 307.44 KVAR
say, 300 KVAR bank is required at load end for compansation

Answer / engr junaid afrid

Simply says 630/2=315 kvar for your system.

Answer / mahendra singh

KVAR = KVA * sin@
KVAR = KVA * sqrt (1-cos@*cos@)
KVAR = 630* sqrt(1-.99*.99)
KVAR = 88.87

Answer / sanjay

generally kvar depends upon 33% of full load. please suggest if i m wrong.

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