A three phase transformer of 200MVA, 33kV/380kV, Yd11 isdelivering nominal power at cosφ = 1.
- Calculate the nominal primary and secondary linecurrent.
- 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.
- Calculate the total iron losses and total copper losses ofthis transformer.
- Calculate the total iron losses if the transformer would beconnected to 16,5kV (primary side).
- 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.
