How much secondary current can a 500KVA transformer handle if the primary voltage is 250 volts and the secondary side is 125 volts?

To find the secondary current that a transformer can handle, you can use the formula for transformer power, which remains constant between the primary and secondary sides (assuming ideal conditions). The power (in VA or kVA) is equal to the voltage multiplied by the current.

Here, you have a 500 kVA transformer, which can be represented as 500,000 VA. The primary side operates at 250 volts, and the secondary side operates at 125 volts.

First, calculate the secondary current using the formula:

Power (VA) = Voltage (V) × Current (A).

Rearranging for current gives:

Current (A) = Power (VA) / Voltage (V).

Now plug in the values for the secondary side:

Current (A) = 500,000 VA / 125 V = 4000 A.

This indicates that the secondary current can indeed handle 4000 amps. Therefore, the correct answer reflects the transformer’s ability to convert its rated power at one voltage to a proportional current at the lower voltage on the secondary side.