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b) A 300KVA, 3-phase, 50Hz transformer has a voltage ratio (line voltages)
of 22/11KV and is delta/star connected. The resistances per phase for high
voltage winding are 30 2 and 1 2 for low voltage windings. If the iron loss
is 2Kw, calculate
i. the equivalent resistance per phase referred to secondary
full load copper losses
ii.
111.
the efficiency at full load 0.8 power factor.

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