Answer / lashari

The efficiency of transformer is measured at full load. The efficiency of transformer is almost from 95% to 98%. At the time of load it is measured in at the time load/ rating load *100
thus you can get the efficiency of a transformer.
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Answer / jasmin

at different loading conditions performance of transformer
is judged on the basis of energy consumption during the
whole day(24 hours) . this is known as allday efficiency...
in the design of such transformers effort should be taken
to reduce the iron losses, which continuously occur during
the whole day.
allday efficiency=kWhr outputin24 hrs/kWhr input in 24 hrs

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