how to calculate the capacitor rating for improving power
factor

Answers were Sorted based on User's Feedback



how to calculate the capacitor rating for improving power factor..

Answer / r n seth

capacitor required is too be calculated from required power
factor to desired power factor.the formula is-

Req. Cap in KVAr= Tr. MVA* PF( tan cos-1(existinf PF- tan
cos-1(desired PF))

Is This Answer Correct ?    21 Yes 4 No

how to calculate the capacitor rating for improving power factor..

Answer / engr. tariq

Formula :

C = P (tan|old - tan| new) divided by Omega (w) and then
divided by Voltage (RMS) or Vrms.

theta (|) can be calculated by knowing cos theta OR power
factor. Example PF is 0.77 then Cos theta = 0.77 and Cos
inverse (0.77) = 39.646 = Theta OLD. Now

Now if i want to improve PF to 0.9 then theta = Cos inverse
0.99 = 25.841 = theta New.

After calculating theta put it in the Given formula to
calculate Capacitance required.

Is This Answer Correct ?    11 Yes 1 No

how to calculate the capacitor rating for improving power factor..

Answer / engbri

Another way i use is to take the PF and turn it into an
angular measurement in degrees. using j notation and the
magnitude of the wave you can calculate the size of
resistance, or real component and the size of the inductive
reactance or the -J component. Do this with a simple Polar
to rectangular conversion, if you cant your calculator
probably can. Then making the capacitive reactance equal to
the inductive reactance cancels it as they are oposites.
Then using the formula Xc = 1/2piFc transpose for c which
gives c =1/2piFXc. however as the cpacitor is taken as
ideal and with no resistive component this will never
reduce the PF to zero.

Is This Answer Correct ?    5 Yes 0 No

how to calculate the capacitor rating for improving power factor..

Answer / charu gupta

kVAr Rating = kW(tan A - tan B)
Where kVAr rating is the size of the capacitor needed,kW is
the average power drawn, tan A is the trigonometric ratio
for the present power facotr, and tan B is the
trigonometric ratio for the desired PF

Is This Answer Correct ?    6 Yes 1 No

how to calculate the capacitor rating for improving power factor..

Answer / engr. tariq

Please note that in answer # 5 omega (w) is equal to the
frequency of the system.

Is This Answer Correct ?    4 Yes 0 No

how to calculate the capacitor rating for improving power factor..

Answer / salman

to find above answer so we can directly go through
contract technical book this easiest way.

Is This Answer Correct ?    2 Yes 2 No

how to calculate the capacitor rating for improving power factor..

Answer / shah rukh khan

With the use of Calculator.. lol.. ;)

Is This Answer Correct ?    2 Yes 2 No

how to calculate the capacitor rating for improving power factor..

Answer / pavan vyas

as a thumb rule it should be 1/3 of load kw & theoretically
we can select from the chart

Is This Answer Correct ?    8 Yes 13 No

how to calculate the capacitor rating for improving power factor..

Answer / p.chandrasekharan nair

KVA LOAD*0.6

Is This Answer Correct ?    7 Yes 24 No

how to calculate the capacitor rating for improving power factor..

Answer / sachin gupta

transformer

Is This Answer Correct ?    8 Yes 38 No

Post New Answer

More Electrical Engineering Interview Questions

why can't we increase the voltage by increasing the field voltage in order to get higher voltage.so that we can eliminate step up transformer

4 Answers   Bhel,


name the types of insulatter?

5 Answers  


What is on line ups and off line ups?

2 Answers  


What is load boxes ?

0 Answers   AMIE, PEPL,


what is mean by kneepoint voltage? when it will happen? ( my doubt is, if CT secondary is open means ct get saturation or blas? what are factors are required for calculations? plz give currect anws:

0 Answers  


what is the method to measure the transformer current carrieng capacity in three phase.

1 Answers  


what is mean by potential and potential free contacts

2 Answers  


why delta delta connection generally not use in transformer

4 Answers   Lanco,


How to Calculate Transformer Earthing Electrode Rod Size both Body and neutral Earthing ? Any Standard Formula? Please Suggted

0 Answers   EnPro,


if you are in a software company,then why do you want to come in a core company like sail, ntpc(where lots of trouble like tension but you have a good life in a it company) ?

0 Answers   Sail,


can i know how to design overcurrent setting and earth fault for 11kv & o.433kv system assuming tx 1000kva.

2 Answers  


Why the isolation treasforfer are connected at out put of the ups ig 200kva ??????????????????

3 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5085)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4452)
  • Electrical Engineering Interview Questions Electrical Engineering (16637)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)