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machine

A 100 kVA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronous

reactance of 6 Ω per-phase and negligible armature resistance. Its core losses are 7 k W and its

friction and windage losses are 8 KW. The speed droop is 2.5%.

Initially the machine is operated alone as a generator and the field current is adjusted such that the no-load voltage equals the rated voltage.

 If the generator is connected to a 1100 V, 50 Hz infinite bus

 Find the power factor such that the output power is the same as in. 

(a). Also find the no-load frequency of the generator.


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