1:52 PM | 0.1KB/s.. 5/8 PART 111. AC Machine problem (Total 40 points) 1. A 13.8-kV, 50-MVA, 0.9-PF-lagging, 60-Hz, four

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1 52 Pm 0 1kb S 5 8 Part 111 Ac Machine Problem Total 40 Points 1 A 13 8 Kv 50 Mva 0 9 Pf Lagging 60 Hz Four 1 (37.37 KiB) Viewed 16 times

1:52 PM | 0.1KB/s.. 5/8 PART 111. AC Machine problem (Total 40 points) 1. A 13.8-kV, 50-MVA, 0.9-PF-lagging, 60-Hz, four-pole, Y-connected synchronous generator has a synchronous reactance of 2.5 2 and an armature resistance of 0.2 2. At 60 Hz, its friction. and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a de voltage of 120 V, and the maximum IF is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in Figure. (a) What is the internal generated voltage of this machine at rated conditions? And How much field current is required? (b) What is the efficiency of the generator at the rated conditions? (c) What is the voltage regulation of the generator if it is loaded to rated kilovoltamperes with (1) 0.9-PF-leading loads, (2) 0.9-PF-lagging loads? Falda) (15 points) 35%