A 500 MVA, 2 pole, turbo-alternator delivers 400 MW to a 50Hz system. If the generator circuit

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A 500 MVA, 2 pole, turbo-alternator delivers 400 MW to a 50Hz system. If the generator circuit breaker is suddenly opened and the main steam valves take 400 ms to operate what will be the over-speed of the generator? The stored energy of the machine (generator and turbine) at synchronous speed is 4 kWs/ kVA.