I can't find formula for this. I have rated load current, acutal load current, rated output voltage and variability of output voltage (given in percentage).
How to find no-load output voltage and output voltage for given load current?
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Rated Voltage at rated current for a source impedance of Z = 6% pu means that the source impedance is 6% of the rated load impedance so for rated current they allow a 6% series drop and short circuit current is 1/6% or 16.7 x rated current and no load voltage is 6% higher thus lower loads will be proportionally less
or given %Ipu, %Zpu , what is %Vpu?
%Vpu rise above rated voltage V load = Vrated + %Ipu * %Zpu
This is because %Zpu and %load regulation error are equivalent.
1 p.u. 100% per unit of rating for V,I,Z,P
Calculate the Thevenin equivalent of the secondary output. From that, you can easily calculate the output with any particular load.
The open circuit output voltage is the Thevenin source voltage. With one other data point of voltage and current, you can compute the Thevenin source resistance.
If it's academic homework, then go look up the equivalent circuit of a transformer, put numbers on all the reactances and resistances and back predict what the open circuit voltage is knowing the full load current and full load voltage. Strictly speaking you will need to know the complex nature of the impedance of the load that it is rated for. Here's a start for you: -