Originally Posted by

**mattj77**
1. A given 1000kVA wye-wye transformer has a secondary rated voltage of 480/277V, what is the line current of this transformer?

Your Answer: 3610A

Correct Answer: 1203A

Help: First find transformer FLA and then calculate line current.

1. FLA = VA / L-L Voltage x 1.732

2. Balanced Wye: Line Current = Phase Current, Line Voltage = 1.732 Phase Voltage

I guessed the wrong answer on purpose on this one because the formula used does not fully explain how to calculate 3 power. It should actually be this:

KVA/(3 * phase voltage)

Why would you take the line voltage and multiply it by the sqrt(3) when it is already the product of the phase voltage * sqrt(3)?