The steam turbine installed at our site currently facing tripping of machine on over speed.
Sequence of tripping start from load side transmission lines voltage becomes zero resulting GCB opened due to over frequency. As GCB opened, load rejection scheme initiated but Turbine tripped on Over speed.
The load rejection scheme initiated successfully on low load approximately 25% of the total load and machine successfully shifted to FSNL however load rejection scheme failed at full load and tripped on over speed.
What are the reason of tripping of machine on over speed at full load?
What options available to avoid tripping of machine on over speed and load rejection initiate successfully at full load?
Sequence of tripping start from load side transmission lines voltage becomes zero resulting GCB opened due to over frequency. As GCB opened, load rejection scheme initiated but Turbine tripped on Over speed.
The load rejection scheme initiated successfully on low load approximately 25% of the total load and machine successfully shifted to FSNL however load rejection scheme failed at full load and tripped on over speed.
What are the reason of tripping of machine on over speed at full load?
What options available to avoid tripping of machine on over speed and load rejection initiate successfully at full load?