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  3. a three phase transformer of 200mva, 33kv/380kv, y

A three phase transformer of 200MVA, 33kV/380kV, Yd11 is delivering nominal power at cosφ = 1. Calculate...

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Electrical Engineering

A three phase transformer of 200MVA, 33kV/380kV, Yd11 isdelivering nominal power at cosφ = 1.

  1. Calculate the nominal primary and secondary linecurrent.
  2. Calculate the winding ratio n of thistransformer.

The primary line current is 15,9A during an open circuit test.The measured power per phase is then 53kW. During a short circuittest (at nominal current), 271V primary line voltage is measured atcosφ = 0,225.

  1. Calculate the total iron losses and total copper losses ofthis transformer.
  2. Calculate the total iron losses if the transformer would beconnected to 16,5kV (primary side).
  3. Draw the single-phase equivalent circuit of thistransformer. Give also the phase quantities of the voltages andcurrents and indicate what the circuit elementsrepresent.

Please show process and computations withcomments.

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