The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 79.1% for a load with unit power factor at rated power. Transformer Relative short circuit voltage% Uk = 30.0 and relative idle current% I0 = 30. Since the transformer is connected star-delta; Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase value When given, it must be specified separately. Therefore, all current-voltage information given in the question are line values. 1-Draw the primary reduced equivalent circuit. 2-What is the power value measured in the short circuit test of this transformer? -The value of iron losses of this transformer what?

The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 79.1% for a load with unit power factor at rated power. Transformer Relative short circuit voltage% Uk = 30.0 and relative idle current% I0 = 30. Since the transformer is connected star-delta;

Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase value When given, it must be specified separately. Therefore, all current-voltage information given in the question are line values.

1-Draw the primary reduced equivalent circuit.

2-What is the power value measured in the short circuit test of this transformer?

-The value of iron losses of this transformer what?