Selection of Transformer

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

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  1. 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
     
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  2. Jan 12, 2009 #2
    Wendy

    Moderator

    Mar 24, 2008
    21,362
    2,921
    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.
     
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  3. Jan 12, 2009 #3
    mik3

    Senior Member

    Feb 4, 2008
    4,846
    69
    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
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  4. Jan 12, 2009 #4
    eblc1388

    AAC Fanatic!

    Nov 28, 2008
    1,543
    104
    VA rating = RealPower/pf :confused:
     
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  5. Jan 12, 2009 #5
    mik3

    Senior Member

    Feb 4, 2008
    4,846
    69
    Ohhh yes, you are right. Just got confused. ;)
    I corrected it too.
     
    #5 Reply
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