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Answer Posted / ramji
The Generator will run still since there some steam trapped
in Turbine.This suitation is called Low Forward Power since
there is not enough Steam to run the Generator in desired
speed.This occurs because of some trapped steam in turbine
for some seconds.Now Days special vents doors are designed
in turbine to release these steam on account of tripping of
turbines
But Normally in protection Trip Logic of Generators there
will be Class:A,Class:B,Class:C
For Class A Gen Breaker will trip for below faults
U/V Stage-2 , O/V , Low Forward Power,Reverse Reactive
power,Neg Ph Seq ,Over Voltage
For Class B Turbine Breaker will Trip which also trip Gen
breaker instantly for below faults
Differential protection , Restricted Earth Fault .....
For Class C Grid Breaker will trip for below faults
Over Frequency and Under Frequency Under Voltage stage-1
and Over voltage
Because when you trip Gen Breaker for Undervoltage it will
result in whole plant black out so for stage-1 tripping of
grid breaker will do
similarly for All turbine faults the Gen Breaker is tripped
so that it is isolated from the system
| Is This Answer Correct ? | 17 Yes | 4 No |
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