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22 Cards in this Set
- Front
- Back
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What does it mean when the "Speed Control" light is lit on the Turbine controls?- - 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 |
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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) |
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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) |
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What does it mean when the "Unit Trip" light is lit on the Turbine controls?
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<45psi in Auto-Stop oil system Turbine not latched |
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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) |
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What shifts the Turbine to MANUAL?
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- Speed Ref Chan - Speed Chan - Load Ref Chan - Maintenance and Test - Pressing "Turbine Manual" |
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What other Turbine Monitor/Alarms perform auto functions?
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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)
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What are all the Turbine Monitor/Alarms on the vertical section of the turbine controls on C03?
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- Load Ref Chan - Load Chan - Speed Ref Chan - Speed Chan - Overspeed Protect Control (LDA) - Emergency Power Supply |
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What do the following positions for the Aux Gov Test Switch (key switch) do? - In Service Test Overspeed Test
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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% |
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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 |
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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) |
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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 |
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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) |
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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) |
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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) |
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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 |
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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 |
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Whats the magic number when it comes to shaft vibes and why? |
- 14 mils requires manual turb trip |
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What are the manual trip requirements associated with rotor position? |
Manual trip required <20 mils or >100 mils |
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Where can Stator End Vibes be monitored? |
Computer room |
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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) |
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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) |
