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A 50 Hz synchronous generator is supplying 60% of its maximum power to an infinite bus...

A 50 Hz synchronous generator is supplying 60% of its maximum power to an infinite bus through a reactive network. Due to a certain fault, the reactance of the network between the generator internal voltage and the infinite bus is increased four times. After the fault is cleared, 80% of maximum power can be transferred
Sketch the mechanical power vs. power angle curves, in the same figure, under the different operation conditions, and annotate all the key points on the curves
Calculate the power angle before which the fault shouldbe cleared to avoid the generator instability

A 50 Hz synchronous generator is supplying 60% of its maximum power to an infinite bus through a reactive network. Due to a certain fault, the reactance of the network between the generator internal voltage and the infinite bus is increased four times. After the fault is cleared, 80% of maximum power can be transferred
Sketch the mechanical power vs. power angle curves, in the same figure, under the different operation conditions, and annotate all the key points on the curves
Calculate the power angle before which the fault shouldbe cleared to avoid the generator instability

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