voltage calculation for transformer

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lowvoltman

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If you had a 480/240-120v single phase transformer with primary taps set at 480v but were only receiving 422 volts, what would the secondary voltage be? 105v?. If you changed the tap to 432v(low as it goes) what would the secondary voltage be then? 117v? Is my math correct? thanks.
 
brian john

brian john

Senior Member
Location
Leesburg, VA
The transformer is 480/240 or 2 to 1 ratio, so the secondary voltage would be 422/2=211/105.5.

432/240=1.8 to 1 ratio, 422/1.8=234.4/117.2

I am no math wizard so HOPEFULLY others will chime in.
 
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