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Question
WHAT IS THE THUMB RULE FOR CALCULATING THE P.F CORRECTION 
CAPACITOR?? SAY FOR 100 HP MOTOR HOW MUCH MICRO FARAD 
CAPACITOR IS NEEDED .... THUMB RULE SO QUICK ANSWER WANTED
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
for 2.5HP 1KVAR is required 
Is This Answer Correct ?    7 Yes 1 No
Sanjay Gonsalves
 
Answer
# 2
Requd. KVAR = Running KW*{tan angle (OF running Load)- tan
angle (of P.F. Requried)}
 
Is This Answer Correct ?    2 Yes 2 No
Kapil
 
 
 
Answer
# 3
nearly 1/4.5 of the hp and 1/3 of kw 
Is This Answer Correct ?    2 Yes 4 No
Dharmvir
 
Answer
# 4
First convert HP into KW.
1HP = 746 KW

Then assuming 0.8 powerfactor of motor,calculate KVA

KVA = KW x powerfactor

now calculate kvar by using following

KVAR = square root of (square of kw - squre of kva)
 
Is This Answer Correct ?    3 Yes 7 No
Rajnikant
 
Answer
# 5
Motor is an inductive load so it is consuming
active power that depends on its load and
reactive power that is consumed by motor to set up its
magnetic field it is constant so we should connect a
capacitor which consumes the negative reactive power
according to p.f. correction requirement.
 
Is This Answer Correct ?    5 Yes 10 No
Himanshu
 
Answer
# 6
Approx. one third of HP rating of 3ph motor is kvar of
capacitor required.
 
Is This Answer Correct ?    3 Yes 8 No
Santosh
 
Answer
# 7
For 100 HP load kVAR required will be half i.e 50 kVAR. If
you go for proper calculation, ans would be closer.
 
Is This Answer Correct ?    7 Yes 17 No
Pankaj Malhotra
 

 
 
 
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