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A 50 Hz four pole turbo-generator rated 100 MVA, 11 kV has an inertia constant of 8 MJ/MVA. If the mechanical input is suddenly raised to 80 MW for an electrical load of 50MW, then the rotor acceleration is __________

A 50 Hz four pole turbo-generator rated 100 MVA, 11 kV has an inertia constant of 8 MJ/MVA. If the mechanical input is suddenly raised to 80 MW for an electrical load of 50MW, then the rotor acceleration is __________ Correct Answer 337.5

Energy stored = 100*8 =800MJ Accelerating power = Md2δ/dt2 M=GH/180f = 800/(180*50) = 4/45 MJs/elect. Deg α= 337.5 elect deg/s2.

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