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Answer Posted / shambhu sharan prabhat
Suppose generator is synchronysed with grid and is
supplying power to the grid. If suddenly turbine trips and
gcb of generator does not open then there wil be reverse
flow of power from grid to generator stator windings as
generator will be on low potential side.Generator will now
act as induction motor and therewill be a heating of rotor
end rings and wedges damaging the rotor windings also.
Considering turbine, as stop valves are closed and there is
now no cooling media (steamflow ) for rotaing turbine at
synchronous speed there will be overheating of blades
causing damage to last stages of turbine.
| Is This Answer Correct ? | 14 Yes | 3 No |
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