How many amps can 30 kva transformer 575 volts to 480 volts gives?

Answer 1

for three phase the calculation is 30,000 = 1.73*V*I - simple as that.

For single Phase the calculation is 30,000 = V*I - simple as that

It is important to note the voltage in the first line is Line to Line (typically how it is specified in three phase power systems), and the second line it is Line to neutral.

A 30KVA transformer is the same as 30,000VA to find out the Amps you need to divide the voltage if the transformer is single phase for example:

30,000VA / 480V = 62.5 Amps

The calculation for a 3 phase transformer is the VA / voltage / 1.73 for example:

30,000VA /480V / 1.73 = 36.12 Amps

Answer 2

The equation that you are looking for is; Amps when Kilowatts is known - kW x 1000/1.73 x volts x pf. Usually the power factor of a transformer is about .9.