Question { Reliance, 42598 }

HOW TO CALCULATE THE CAPACITOR RANGE FOR LOAD FOR PF
IMPROVEMENT?
EXPLE:FOR 65 HP LOAD HOW TO CALCULATE CAPACITOR RANGE?

Answer

In This case no other detail is given except the power
rating .

Therefore pf=( KW/KVA)
In order to get incentive and good power factor it is
required to maintain power factor above 0.95

So we take pf=0.95 and kw=(65*0.746)=48.49
Therefore KVA= 48.49/0.95 = 51.04

We know that KVAr= Squareroot( (KVA)^2-(KW)^2)


Therefore KVAr = sqrt(51.04^2-48.49^2)

=15.90 approx..


Capacitor required = 16KVAr.

Question { TATA, 16870 }

What will hapen if we run generator below 47.6hz frequency?

Answer

since all the equipments are designed to run at a frequency
of 50 Hz ( +/- 2 Hz) , low freuency will make the generator
to run at a speed less than the designed value thus
hindering the designed value of output.