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A three phase transformer of 400kVA, 10kV/400V, Dy11 is connected to its nominal load with cosφ...

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Electrical Engineering

A three phase transformer of 400kVA, 10kV/400V, Dy11 isconnected to its nominal load with cosφ = 1.

a) Calculate the nominal primary and secondary linecurrent.
b) Calculate the corresponding currents in the primary andsecondary winding.

At an open circuit test, the primary line current is 0,52A withcosφ = 0,05 at nominal line voltage.
The short circuit test (at nominal current) shows 214V primary linevoltage and P=1,333kW per phase.

c) Calculate the total iron losses and total copper losses ofthis transformer.

d) Calculate the efficiency η of this transformer.

Now the transformer will be loaded with 210kW with cosφ = 0,83(lagging).

e) Give both the iron losses and the copper losses as apercentage of what they are nominally.

Please show process and computations withcomments.

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