30, 35 MVA, 154 kV/10.5 kV, 50 Hz, i 0.6%, UN 13%, Po-28 kW, P=170 kW, Yd11 connected, ONAF cooling system Find and draw the equivalent circuit parameters of the transformer in terms of both real and unit values. Calculate the efficiency of the transformer when operated at 70% load with an inductive power factor of 0.9. Relative voltage drop and secondary voltage when the transformer is operated at 70% load with an inductive power factor of 0. Calculate both unit value and rms real value. Calculate at what load ratio the maximum efficiency is achieved in this transformer with an inductive power factor of 0.9. Calculate the maximum efficiency mentioned in part (d).

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di Dü
D.
The following values are given for a three-phase transformer:
30, 35 MVA, 154 kV/10.5 kV, 50 Hz, i 0.6%, UN 13%, Po-28 kW, P=170 kW,
Yd11 connected, ONAF cooling system
Find and draw the equivalent circuit parameters of the transformer in terms of both real and unit values.
Calculate the efficiency of the transformer when operated at 70% load with an inductive power factor of 0.9.
Relative voltage drop and secondary voltage when the transformer is operated at 70% load with an inductive power factor of 0.9.
Calculate both unit value and rms real value. Calculate at what
load ratio the maximum efficiency is achieved in this transformer with an inductive power factor of 0.9.
Calculate the maximum efficiency mentioned in part (d).
Transcribed Image Text:di Dü D. The following values are given for a three-phase transformer: 30, 35 MVA, 154 kV/10.5 kV, 50 Hz, i 0.6%, UN 13%, Po-28 kW, P=170 kW, Yd11 connected, ONAF cooling system Find and draw the equivalent circuit parameters of the transformer in terms of both real and unit values. Calculate the efficiency of the transformer when operated at 70% load with an inductive power factor of 0.9. Relative voltage drop and secondary voltage when the transformer is operated at 70% load with an inductive power factor of 0.9. Calculate both unit value and rms real value. Calculate at what load ratio the maximum efficiency is achieved in this transformer with an inductive power factor of 0.9. Calculate the maximum efficiency mentioned in part (d).
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