A 480 V, 50 Hz, Y-connected, 4 pole synchronous generator has the OCC shown in the figure 1 below. This generator has a synchronous reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 600 A at 0.8 PF lagging. Under full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30 kW. Ignore any field circuit losses. 3.1.1 What is the speed of rotation of this generator? 3.1.2 How much field current must be supplied to the generator to make the terminal voltage 480 V at no-load? 3.1.3 Under full-load conditions, how much field current will be required to keep the terminal voltage equal to 480 V? 3.1.4 Under full-load conditions, how much power is the generator supplying? How much power is supplied by the prime mover? What is the machine’s overall efficiency?
3.1 A 480 V, 50 Hz, Y-connected, 4 pole synchronous generator has the OCC shown in the
figure 1 below. This generator has a synchronous reactance of 0.1 Ω and armature
resistance of 0.015 Ω. At full load, the machine supplies 600 A at 0.8 PF lagging. Under
full-load conditions, the friction and windage losses are 40 kW, and the core losses are 30
kW. Ignore any field circuit losses.
3.1.1 What is the speed of rotation of this generator?
3.1.2 How much field current must be supplied to the generator to make the terminal
voltage 480 V at no-load?
3.1.3 Under full-load conditions, how much field current will be required to keep the
terminal voltage equal to 480 V?
3.1.4 Under full-load conditions, how much power is the generator supplying? How much
power is supplied by the prime mover? What is the machine’s overall efficiency?
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