Selection of Transformer

Discussion in 'General Electronics Chat' started by asimraufawan, Jan 12, 2009.

  1. asimraufawan

    Thread Starter Member

    Jul 4, 2008
    29
    0
    Hi everyone,

    How to select the transformer VA rating for an application with respect to power cconsumption.

    Thanks
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Actually it is pretty basic, on the surface at least. Voltage and current you need to feed with the power supply.

    Transformers don't use much wattage themselves. They transform voltages and currents, and do so very efficiently.
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you know the VA of the machine then choose one with the same VA or higher. If you know the real power (P) consumed by the machine and its power factor (pf) then you can calculate VA by:

    VA=P/pf

    Again choose a transformer with he same or higher VA rating.
     
    Last edited: Jan 12, 2009
  4. eblc1388

    Senior Member

    Nov 28, 2008
    1,542
    102
    VA rating = RealPower/pf :confused:
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Ohhh yes, you are right. Just got confused. ;)
    I corrected it too.
     
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