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22 Cards in this Set

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What does it mean when the "Speed Control" light is lit on the Turbine controls?-


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What does it mean when the "Load Control" light is lit on the Turbine controls?

Generator output bkr is open


Setter and Reference indicators are in RPM


-


Generator output bkr is shut


Setter and Reference indicate based on 1st stage in or out



What do the Setter and Reference indications inidicate when in 1st stage in?


-


What do the Setter and Reference indications inidicate when in 1st stage out?

1st stage in:


Setter and Reference indicate % power based on 1st stage pressure




1st stage out:


Setter and Reference indicate gove valve(s) position (arbitrary number)

What will cause a "Turbine Runback"?


-


When does a Turbine Runback NOT occur?


-


What happens when a Turbine Runback signal is received?

Loop Delta-T reaching one of the OT-Delta-T or OP-Delta-T stpts


-


Turbine Runback does NOT occur in MANUAL


-


200%/min load decrease for 1.5 sec, then 28.5 sec pause (5% every 30 sec, after 2 runbacks (10%), condenser stm dumps arm)

What does it mean when the "Unit Trip" light is lit on the Turbine controls?

<45psi in Auto-Stop oil system


Turbine not latched

What do the Valve Position Limit and Runback Operate lights indicate?

Valve Position Limit: - Governor valves are clamped with limiter


-


Runback Operate: - Turbine in auto - runback occuring (light is only on during the 1.5 sec load ramp)

What shifts the Turbine to MANUAL?

- Speed Ref Chan


- Speed Chan


- Load Ref Chan


- Maintenance and Test


- Pressing "Turbine Manual"

What other Turbine Monitor/Alarms perform auto functions?
Load Chan - transfers to 1st stage out automatically (indicates PT-2058 1st stage pressure is less than reference counter by more than stpt error value)
What are all the Turbine Monitor/Alarms on the vertical section of the turbine controls on C03?

- Load Ref Chan


- Load Chan


- Speed Ref Chan


- Speed Chan


- Overspeed Protect Control (LDA)


- Emergency Power Supply

What do the following positions for the Aux Gov Test Switch (key switch) do?


-


In Service


Test


Overspeed Test


In Service: Normal - Aux Gov Works as normal


Test: Opens 20AG valve if output bkr is open


Ovrspd tst: Disables Aux Gov protection to allow testing of mechanical ovrspd @ 105%

What do the following positions for the Maintenance Test switch (key switch) do?

-


Off


Test

Off - Normal position deactivates test circuits


Test - Allows testing of the turbine controls w/o actual movement of the gov valves

What's the difference between 1st Stage In and 1st Stage Out backlit pushbuttons?

When 1st stage in is lit: Gov is maintaining 1st stage pressure - Setter and Reference are indicating 1st stage pressure in % power




When 1st stage out is lit: Gov is maintaining gov valve position - Setter and Reference are indicating a number that correlates to a total gov valve position (usually around 84 at 100% power)

What's the difference between reducing power via Turbine Manual, and Operator Auto 1st


Stage Out?

Both Modes control valve position only


- Turb Man: uses GV Lower and GV Raise - 33%/min


- 1st St Out: uses setter and reference indicators w/ a ramp rate selected by "Load Rate % per Min" selector (fastest rate is 5%/min or 200%/min)




Basically Manual is faster

What does the "Speed Ref Chan" light indicate?


-


What does the "Speed Chan" light indicate?

SRC - In Spd Control - MTS and reference are >300 RPM different


- In Load Control - EH Spd Controller ref voltage has failed


-


Indicates Main and Aux turb speed transducers do not agree (one has failed)

What does the "Load Ref Chan" light indicate?


-


What does the "Load Chan" light indicate?

Load Reference counter is less than 1st stage pressure by more than stpt error value (Load Ref counter failed)


-


Indicates 1st stage pressure is less than ref counter by more than stpt error value (1st stage press transducer failed)

What does the "Overspeed Protect Control" light indicate?


-


What does the "Emergency Power Supply" light indicate?

Load Drop Anticipator (LDA) is disabled (normally lit until >5%) either Kw or x-over stm transducer failed


-


Indicates failure of one of the EHC power supplies (PMG or 1(2)Y-06 (normally lit until >1000 RPM)

When does the Aux Gov signal open 20AG?

- 103% turbine speed (also opens x-over stm dumps when >116psi x-over stm press)




- >30% mismatch between x-over press and MWe





What does Turb Casing Expansion measure?


-


What does Differential Expansion measure?


-


What is the Eccentricity alarm stpt? and when is it disabled?



TCE - Measures casing expansion during temperature transients (S/U, S/D & Load chgs)


-


DE - Measured relative motion between moving and stationary parts


-


Eccentricity alarms at 3 mils - auto disables at >600 RPM

Whats the magic number when it comes to shaft vibes and why?

- 14 mils requires manual turb trip

What are the manual trip requirements associated with rotor position?

Manual trip required <20 mils or >100 mils

Where can Stator End Vibes be monitored?

Computer room

What is necessary forthe Turning Gear to Auto Engage and the turning gear motor to start?

Turning Gear Mode selector switch (C03) “Auto”


To Engage:


• < 600 rpm turbine speed


• 16psi on zero speed device


• >5 psig IA pressure


Motor Start:


• 3-5 psig bearing oil pressure


• Tooth engagement (limit switch)



Where can turbinesupervisory parameters be monitored?

• C-11 Panel (44’ Turbine Hall – West)


• TR-6019 (Next to turbine controls vertical section of C03)




(Computer room for stator end vibes)