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What is the Auto-start Sequence of a generator
Penstock is full
Exciter CB closes
Brakes release
Cooling water valve opens
Lift pump starts
Gate Lock Solenoid and Governor Shut Down Solenoid will pick up
Wicket Gates open to breakaway position (30-40%)
No-Load Speed Solenoid picks up (changing gate limit to 15%)
Lift Pump shuts down
What is the purpose of the Exciter
To control the generators terminal voltage by regulating the strength of the magnetic field on the rotor
What is the purpose of the Governor
To control the speed of the generator by regulating the flow of water
What is the purpose of the Thrust Bearing
To support the weight of the rotor, shaft and turbine
What is the purpose of the Guide Bearing
To keep the shaft aligned to prevent rotor stator contact
What is the purpose of the Lift Pump
To apply high pressure oil to the thrust bearing on start up and shut down
What is the purpose of the field CB
To open in case of a fault in the exciter circuit
What is cavitation
When a rapid pressure change in liquid causes empty cavities to be created and quick implode
Why is the tailrace level above the height of the turbine
To ensure seals stay lubricated when the unit is not in use
Author
SMD
ID
353491
Card Set
Term 3.txt
Description
Exam Hints
Updated
2020-10-14T22:19:02Z
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