how we can calculate which capacity capacitor bank we have to add for improve

how we can calculate which capacity capacitor bank we have
to add for improve pf?

Question Posted / nstailor810

3 Answers
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how we can calculate which capacity capacitor bank we have to add for improve pf?..

Answer / abdulsubur

p total connect load in kw =932

cos 1 =power factor before improvement =0.8 assume
cos 2= poer factor after improvement =0.9
kvar 1= ptan1 932*0.75=699.03kvar
kvar 2=ptan2 932*.4843=451.39kvar
req rating of capacitor bank =kvar1-kvar2
=699.03-451.39
=247.64kvar =250kvar

Is This Answer Correct ?

12 Yes

4 No

how we can calculate which capacity capacitor bank we have to add for improve pf?..

Answer / z_hosen

More simply,
Let total power is 1500kw

assume
cos 1 =power factor before improvement =0.75
cos 2= poer factor after improvement =0.98
tan1=0.88
tan2=0.2
and
kvar 1= power*tan1=1500*0.88=1320kvar
kvar 2=power*tan2=1500*0.2=300kvar

now, required rating of capacitor bank =kvar1-kvar2
=1320-300
=1020kvar =1000kvar

thanking u
z_hosen@yahoo.com

Is This Answer Correct ?

11 Yes

4 No

how we can calculate which capacity capacitor bank we have to add for improve pf?..

Answer / karuppiah

Let total power is 1500kw

assume
cos Q1 =power factor before improvement =0.75
cos Q2= poer factor after improvement =0.98
tan1=0.88{cos Q1=0.75,Cos-0.75=46.01degree,Now angle is
46.01,so tan(46.01)=0.88}

tan2=0.2

and
kvar 1= power*tan1=1500*0.88=1320kvar
kvar 2=power*tan2=1500*0.2=300kvar

now, required rating of capacitor bank =kvar1-kvar2
=1320-300
=1020kvar
Capacitor Bank should connect parallel with the load.
Thanks
Karups