A 2400 V,1000kVA,0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected synchronous generator has a synchronous re

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A 2400 V 1000kva 0 85 Power Factor Pf Lagging 50 Hz Six Poles Y Connected Synchronous Generator Has A Synchronous Re 1 (112.28 KiB) Viewed 22 times

A 2400 V,1000kVA,0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected synchronous generator has a synchronous reactance of 1.4Ω and an armature resistance of 0.15Ω. At 50 Hz, its friction and windage losses are 25 kW, and its core losses are 15 kW. The field circuit has a DC voltage of 230 V, and the maximum IF​ is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200Ω. The Open Circuit Characteristic (OCC) of this generator is shown in Figure Q1(c). (i) Calculate the internal generated voltage, EA​ of this machine at rated conditions. (6 marks) (ii) Determine the required field current to make VT​ equal to 2400 V when the generator is running at rated conditions. (3 marks) (iii) If this machine is operating at rated conditions, determine the input torque, τAPP​ that must be applied to the shaft of this generator. (7 marks)