Question

Three single-phase, 10 kVA, 2400/280 V, 60-Hz transformers are connected to form a three-phase, 2400/480 V transformer The equivalent impedance of each single-phase transformer referred to the primary side is 10 + j30 Ω. The transformer bank delivers 30 kVA at 480 V and 0.9 power factor lagging.
a. Draw the three-phase schematic diagram showing the transformer connection. Draw a per-phase equivalent circuit.
b. Determine the primary current and power factor.
c. Determine the primary voltage.
d. Determine the voltage regulation.

Answer 1

The answer to this question is letter A