Selection of Transformer

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

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Jan 12, 2009 #1

asimraufawan Thread Starter Member

Jul 4, 2008

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Hi everyone,

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

Thanks

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Jan 12, 2009 #2

Wendy Moderator

Mar 24, 2008

20,874

2,654

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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Jan 12, 2009 #3

mik3 Senior Member

Feb 4, 2008

4,846

65

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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Jan 12, 2009 #4

eblc1388 AAC Fanatic!

Nov 28, 2008

1,543

102

VA rating = RealPower/pf

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Jan 12, 2009 #5

mik3 Senior Member

Feb 4, 2008

4,846

65

eblc1388 said: ↑

VA rating = RealPower/pf
Click to expand...

Ohhh yes, you are right. Just got confused.
I corrected it too.

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