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Design a 100 kVA, 3_, 50 Hz, 11 KV/440 V, _-Y distribution
transformer, self-oil cooled with temperature rise not to exceed 40C. The no
load loss is 350 W and copper loss and stay load loss on full load is 2000 W.
The percentage impedance is 4.5%. Calculate also, the no load current,
efficiency at 60C at full load, 75% of load at unity power factor and
regulation at 75C at unity power factor.