A 100 MVA, 50 Hz turbo-generator operates at no load at 3000 rpm. A load of 25 MW is suddenly applied to the machine and the steam valve to the turbine commences to open after 0.6 seconds due to the governor time-lag. Assuming the inertia constant H = 5.0 kW-s per kVA of the generator rating, the frequency to which the generated voltage drops before the steam-flow commences to meet the new load is

A 100 MVA, 50 Hz turbo-generator operates at no load at 3000 rpm. A lo

1.	A 100 MVA, 50 Hz turbo-generator operates at no load at 3000 rpm. A load of 25 MW is suddenly applied to the machine and the steam valve to the turbine commences to open after 0.6 seconds due to the governor time-lag. Assuming the inertia constant H = 5.0 kW-s per kVA of the generator rating, the frequency to which the generated voltage drops before the steam-flow commences to meet the new load is
A.	49. Hz
B.	50.15 Hz
C.	49.24 Hz
D.	49.82 Hz
Answer» D. 49.82 Hz

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