# How to Calculate the PF Factor of a mcahine

Home Electrical Engineering Forum General Discussion How to Calculate the PF Factor of a mcahine

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• #10411
Keymaster

Hi all

Please can someone help me, i am trying to calc the PF factor of my heavyduty machines.

I know the voltage and the amps but how do i calc the PF factor??

#11885
Keymaster

David Knight said:

Hi all

Please can someone help me, i am trying to calc the PF factor of my heavyduty machines.

I know the voltage and the amps but how do i calc the PF factor??

power output=VxIxCOS@… cos@ is the powerfactor

#11886
Keymaster

hi,

generally Power=Voltage*current*power factor

if you known V and I then you can find the P.F from the above formaula…

#11872
Keymaster

#11908
Keymaster

Does anyone know where i can get power factor standards of various equipment ?

im sizing the capacitor bank for a hospital so there is a lot of equipment

and does anyone know if nema has standards for power factors of motors?

thx

#11980
TRIPURARI
Participant

p=v*i*cos@

where p=power

v=voltage

i=current

cos@=power factor

#12142
Spir Georges GHALI
Participant

David Knight said:

Hi all

Please can someone help me, i am trying to calc the PF factor of my heavyduty machines.

I know the voltage and the amps but how do i calc the PF factor??

David Knight said:

Hi all

Please can someone help me, i am trying to calc the PF factor of my heavyduty machines.

I know the voltage and the amps but how do i calc the PF factor??

Dear Davis ;

First, if you know the Voltage, the current of the machine, the kind of machine ” Sigle phase  or  3 phases “, and the power of the machine, you can do a simple calculation to have the value of Cos φ, where :

– For Single phase machine : P = V x I x Cos φ

– For 3 phases machine : P = 1.73 x U x I x Cosφ

Noting that :

– V : value of voltage betwwen phase & neutral

– U : value of voltage between 2 phases.

– I : the current of the machine

but, if you don't know the power of the machine, so you should either measure directly the value of Cos φ.

regards.

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