If the load is 10Kw and power factor has to improve from 0.5
to 0.8,how can we select the capacitor rating
accordingly.Illustrate by showing formula?
Answers were Sorted based on User's Feedback
Answer / guest
at 0.5pf Apparent power is 10/0.5=20VA
reactive power = 17.321kVAR.
At 0.8pf
APPARENT POWER =10/0.8=12.5VA
Reactive power=7.5kVAR
So we need to provide (17.321-7.5)=9.821kVAR reactive power
through capacitor to bring of up 0.8 from 0.5.
So we need a capacitor rated for approximately 10kVAR to
achieve the target.
ANS= CAPACITOR RATING 9.821kVAR (approximately 10 kVAR)
Is This Answer Correct ? | 10 Yes | 2 No |
Answer / prasad damodar bhoir
kvar= kw (tan phi 1- tan phi 2)
cos phi 1= 0.5, phi 1= cos inverse 0.5= 60
cos phi 2= 0.8, phi 2= cos inverse 0.8= 36.86
kvar= 10 (tan60 - tan 36.86)= 10 (1.73-0.74)
kvar= 9.9
Is This Answer Correct ? | 4 Yes | 0 No |
Answer / h salim
Load = 10 kW
cos phi 1 = 0.5
cos phi 2 = 0.8
Rating of capacitor Qc = kW(tan phi 1- tan phi 2 )
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / prakash g.r.
Calculation of Required Kvar
Initial or Present Power Factor =Qi,
Required Power Factor = Qd
KVAr= KW(TANQi-TANQd)
Qi=COS-1PFi = Initial Power Factor Angle
Qd=COS-1PFd = Final Power Factor Angle
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / ahatesham
at 0.5pf Apparent power is 10/0.5=20VA
reactive power = 17.321kVAR.
At 0.8pf
APPARENT POWER =10/0.8=12.5VA
Reactive power=7.5kVAR
So we need to provide (17.321-7.5)=9.821kVAR reactive power
through capacitor to bring of up 0.8 from 0.5.
So we need a capacitor rated for approximately 10kVAR to
achieve the target.
ANS= CAPACITOR RATING 9.821kVAR (approximately 10 kVAR)
Is This Answer Correct ? | 2 Yes | 0 No |
Kvar = KW * [ tan (cos^-1* Current PF) - tan (cos^-1* Required PF)]
Is This Answer Correct ? | 0 Yes | 0 No |
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