1. A 200-kVA, 3-phase, 50-Hz transformer has a voltage ratio (line voltages) of 33/11-kV and is delta/delta connected. The resistances per phase are: high voltage 30 , low voltage 0.88 Q and the iron loss is 2000 W. Calculate the maximum efficiency and the efficiency at 75 kVA loading, both at 0.75 power factor lagging.

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1.
hai places.
A 200-kVA, 3-phase, 50-Hz transformer has a voltage ratio (line
voltages) of 33/11-kV and is delta/delta connected. The resistances
per phase are: high voltage 30 , low voltage 0.88 Q and the iron
loss is 2000 W. Calculate the maximum efficiency and the efficiency
at 75 kVA loading, both at 0.75 power factor lagging.
Transcribed Image Text:1. hai places. A 200-kVA, 3-phase, 50-Hz transformer has a voltage ratio (line voltages) of 33/11-kV and is delta/delta connected. The resistances per phase are: high voltage 30 , low voltage 0.88 Q and the iron loss is 2000 W. Calculate the maximum efficiency and the efficiency at 75 kVA loading, both at 0.75 power factor lagging.
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