How is the high side coil current calculated for the 50 kVA transformer?

To find the high side coil current for a 50 kVA transformer, it's essential to use the formula that relates the apparent power (in kVA) to the voltage and current. The general formula for calculating current from kVA is as follows:

Current (I) = Power (kVA) x 1000 / Voltage (V).

In this case, the transformer operates on the high side at a voltage of 7200V. By substituting the values into the formula, you calculate the high side current as:

Current = 50 kVA x 1000 / 7200V.

This results in the correct calculation for the high side coil current.

It's important to note that when calculating the current from kVA, using the correct voltage on the transformer side being analyzed is crucial. If a voltage like 12000V is incorrectly selected, it would yield a different current value that does not represent the operational conditions. Similarly, using an incorrect method like multiplying by the square root of 3 (1.73), which applies in three-phase power situations, does not directly calculate the current in this context. Hence, the chosen formula accurately describes how to derive the high side coil current in this scenario.