A four-pole, 800V 3-phase synchronous generator is synchronized to an infinite bus bar of 800V. A...

  

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A four-pole, 800V 3-phase synchronous generator is synchronized to an infinite bus bar of 800V. A steam turbine rotates the generator with speed of 1800 rpm and delivers 2530 Nm to the generator shaft. The power angle when supplying a load of 475.0 kW to the bus is 35°. The synchronous reactance is 1.1 52/phase, (a) Determine the mechanical losses in watt, (b) Determine the generated voltage Er (c) Determine the armature current and the power factor, (d) Determine the reactive power supplied to the infinite bus bar. (e) If the electric load is reduced to 65% of its original load, and the excitation field current is reduced to be 75% of its original value, find the new power angle. Flux Density (B, T) 1.05 0.90 0.75 0.60 0.45- 0.30- 0.15- 2 Magnetomotive Force (A-Upole x 1000) 5 A four-pole, 800V 3-phase synchronous generator is synchronized to an infinite bus bar of 800V. A steam turbine rotates the generator with speed of 1800 rpm and delivers 2530 Nm to the generator shaft. The power angle when supplying a load of 475.0 kW to the bus is 35°. The synchronous reactance is 1.1 52/phase, (a) Determine the mechanical losses in watt, (b) Determine the generated voltage Er (c) Determine the armature current and the power factor, (d) Determine the reactive power supplied to the infinite bus bar. (e) If the electric load is reduced to 65% of its original load, and the excitation field current is reduced to be 75% of its original value, find the new power angle. Flux Density (B, T) 1.05 0.90 0.75 0.60 0.45- 0.30- 0.15- 2 Magnetomotive Force (A-Upole x 1000) 5