voltage regulation

[bahrra]

Where do I go to find the necessary formulas to calculate the voltage on the low side of a step down transformer? I have the impedance, the watt loss, turns ratio and the load. I can do the v=ir and calculate the voltage drop on an per unit basis but I would like to verify if I am doing it right.

 

[rbulsara]

You will have to get the voltage regulation from the manufacturers test data or published data. You can not calculate from the data you have.

 

[jghrist]

You are basically correct. The voltage drop is the difference in source voltage magnitude and load voltage magnitude. Assume one per unit voltage at the load side and add V=I·Z vectorially to get the source voltage. You can get the transformer reactance X in pu from the impedance Z in pu and the resistance R in pu which is load loss divided by the transformer rating. X²=Z²-R²