Home › Electrical Engineering Forum › General Discussion › How to Calculate the PF Factor of a mcahine
 This topic has 6 replies, 3 voices, and was last updated 12 years, 9 months ago by Spir Georges GHALI.

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2011/03/07 at 2:19 pm #10411adminKeymaster
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??
Please help its driving me made
2011/03/07 at 5:47 pm #11885adminKeymasterDavid 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??
Please help its driving me made
power output=VxIxCOS@… cos@ is the powerfactor
2011/03/08 at 9:34 am #11886adminKeymasterhi,
generally Power=Voltage*current*power factor
if you known V and I then you can find the P.F from the above formaula…
2011/03/09 at 7:42 am #11872adminKeymaster2011/03/20 at 10:34 am #11908adminKeymasterDoes 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
2011/04/19 at 7:12 pm #11980TRIPURARIParticipant2011/06/06 at 10:29 am #12142Spir Georges GHALIParticipantDavid 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??
Please help its driving me made
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??
Please help its driving me made
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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