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 10 years, 6 months ago by Spir Georges GHALI.

AuthorPosts

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.

AuthorPosts
 You must be logged in to reply to this topic.