A 75-kVA transformer has an iron loss of 1 kW and a full-load copper loss of 1 kW. If the transformer operates on the following load cycle, determine the all-day efficiency:
8 hours full load at unity power factor
8 hours no load 8 hours one-half full load at unity power factor.
A 10-kVA transformer is known to have an iron loss of 150 W and a full-load copper loss of 250 W. If the transformer has the following load cycle, compute its all-day efficiency:
4 hours full load at 0.8 power factor
8 hours 75% full load at 1.0 power factor
12 hours 50% full load at 0.6 power factor
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