The output power of a transformer at 50% rated load is 0.95 pu. At full rated load, copper coil losses are 0.01 pu, and
Posted: Fri Jul 08, 2022 6:27 am
The output power of a transformer at 50% rated load is 0.95 pu.At full rated load, copper coil losses are 0.01 pu, and core losses0.018 pu. Calculate the transformer efficiency at 50% of ratedload. [Answer: 97.9%. Efficiency = Pout/Pin, Pin = Pout + Plosses.Core losses stay the same independent of load, but the power lostfrom the copper coil is proportional to the square of the powerused by the load, and therefore the square of the efficiency.]