Solved: A 2 2 0 0 volt, 5 0 0 kVA, 5 0 H z , 3 – phase, Y – connected alternator on test, gave the following data:

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A 2200 volt, 500kVA,50Hz,3-phase, Y- connected alternator on test, gave the following data:
Mechanical and iron losses =15kW
Field current at full – load at unity power factor =50A
Resistance of each phase of the armature winding =0.3Ω
The exciter voltage is constant at 100 V . Calculate the full-load efficiency when the power factor of the load is unity.
(20M)

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