HOW TO CALCULATE THE CAPACITOR RANGE FOR LOAD FOR PF
IMPROVEMENT?
EXPLE:FOR 65 HP LOAD HOW TO CALCULATE CAPACITOR RANGE?
Answers were Sorted based on User's Feedback
Answer / deepakindi1
Boss what if u dont have the table?
let Cos(@1) be the present PF
@1=cos'(@1) (cos inverse)
let Cos(@2) be the desired PF
@2=cos'(@2) (cos inverse)
KVAR required= KW[ tan(@1)-tan(@2)]
for 65 Hp load
KW= 65HP*0.746 = 48.49KW
Considering Preent P.F=0.50
desired pf =0.99
ie cos(@1)=0.5
@1=cos'(0.5)=60
@2=cos'(.99)=8.1
kvar=48.49*[tan(60)-tan(8.1)]
=48.49*[1.732-.142]
=77.08
kvar=77.08
Is This Answer Correct ? | 54 Yes | 6 No |
Answer / mahesh sonawane.
Capacitor range is actually given in Kvar, so to find that
range in kvar
As we know
Power factor = KW/KVA
for 65 Hp load
KW= 65HP*0.746 = 48.49KW
Considering Preent P.F=0.50
Target pf =0.99
Multiplying Factor by standard table= 1.59
Kvar= 48.49 KW * 1.59 = 77.09 Kvar
hence for the load of 65hp, capacitor range will be 77.09
Kvar.
Is This Answer Correct ? | 73 Yes | 27 No |
Answer / girish kumar samal, hindalco,h
as pf not giving ,taking pf 0.8
let pf of load =0.8
kw of load= 65 hp=65*0.746=48.5kw
kva =48.5/0.8=60.625kva
kvar =sqrt(60.625^2-48.5^2)=36.375kvar
if we want to improve pf to 0.95 then
improved kva= 48.5/0.95=51.052
improved kvar= sqrt(51.052^2-48.5^2)=15.9411
requard capacitor range = 36.375-15.94=20.43kvar.
Is This Answer Correct ? | 26 Yes | 12 No |
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.
Is This Answer Correct ? | 11 Yes | 11 No |
Answer / manish deswal
let us conside current p.f = .8 & improved to .9,
Load = 65 hp =65 * 746 = 48.49 KW
KVA1 = 48.49/.8= 60.61
KVAR = Squareroot of [ square(60.61)-square(48.49)]=36.36
KVA2 = 48.49/.9= 53.88
KVAR = Squareroot of [ square(53.88)-square(48.49)]=23.49
Increased Capacitor bank capacity = 36.36-23.49 = 12.87 KVAR
Is This Answer Correct ? | 3 Yes | 3 No |
Answer / sonu
Deepankandil why we are subtracting initial-final. littele
bit confusion. please throw some light on this issue.
because it will depand on lagging or leading?
Is This Answer Correct ? | 3 Yes | 6 No |
Answer / ram lal
power factor is not mention so how can calculate ...........
Is This Answer Correct ? | 4 Yes | 7 No |
Answer / naveen kumar mishra
first we should calculate the load(inductive or capacitive
or resistive).
in case of resistive load-----
in case of resistive load the, actual power factor will be
01(maximum),in this case the voltage will linior with
respecte to load current.
so tatal resistive load is(in example 65 hp),
so total load in kw = 65*0.746
=48.49.
As we know
Power factor = KW/KVA
for 65 Hp load(if pure resistive)
Considering Preent P.F=1
Target pf =0.99
Multiplying Factor by standard table= 1.56
Kvar= 48.49 KW * 1.56= 75.64
hence for the load of 65hp, capacitor range will be 75.64
Kvar.(in pure resistor).
Is This Answer Correct ? | 2 Yes | 5 No |
Answer / sudhakara
MR. girish
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