Transformer Rated voltages ?

Thread Starter

Panterulez

Joined Mar 25, 2009
7
What are the rated primary and secondary voltage in a transformer used for ? I know the ratings do not imply the actual operating voltages but what are they meant for then ?
 

beenthere

Joined Apr 20, 2004
15,819
They are meant as the actual operating voltages. Unless you are referring to the hipot rating, which rates the insulation to be good to at least that voltage.
 

mik3

Joined Feb 4, 2008
4,843
The rated voltages of a transformer are the voltages it can work continusly wiuthout breaking down.
 

Thread Starter

Panterulez

Joined Mar 25, 2009
7
Alright . One more question. Why is it during Transfomer testing, for the Open Circuit test, the high voltage side is left open and for the Short circuit test, the low voltage side is shorted. Why can't this be the other way round.
 

mik3

Joined Feb 4, 2008
4,843
Alright . One more question. Why is it during Transfomer testing, for the Open Circuit test, the high voltage side is left open and for the Short circuit test, the low voltage side is shorted. Why can't this be the other way round.
It is left open because no current flows and thus there is no voltage drop across the inductance and resistance of the windings.

It is shorted to ensure that across the ideal windings of the transformer the voltage drop is zero.

If you post a circuit it would be explained better.
 
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