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14 Cards in this Set
- Front
- Back
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Stator Water Pump Auto Starts (from discharge of running pump): |
1. Low Pressure @ 120# (U1) 2. Low Pressure @ 80# (U2) 3. Low Flow @ 845 fpm (U2) |
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Stator Water Pump Trips: |
1. Thermal overload 2. Unit differential |
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Why do pumps trip on unit differential? |
To prevent flooding the generator interior for a stator water rupture. |
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Main Turbine & Unit Differential Trips: |
1. 2/3 RTD's @ 95C after 5 sec delay 2. 2/3 Low flow @ 195 gpm (666 gpm) 3. 2/3 Low pressure @ 13# (28#) |
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The Main Turbine Trip will actuate after a ___ second time delay. The Unit Differential Trip will actuate after a ____ second time delay. |
10 30 |
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The Main Turbine should be manually tripped if the stator water conductivity of ____ micro Ohms/cm. |
18 |
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Differences in stator cooling water loads between U1 and U2 include: |
U1 cools rectifiers. U2 cools generator bushings. |
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1-CRV-640, Regulating Valve, maintains inlet water pressure ___ # below machine gas pressure and mechanical stops prevent flows greater than ____ gpm and less than ____ gpm. |
340, 550 |
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Which two trips are blocked to allow Unit Backfeed operations? |
1. Low pressure 2. Low flow |
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A loss of CCRP blocks which trip? When power is restored the block is removed 15 seconds later. |
High Temperature |
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Water should be kept below ____ gpm in the Stator Water Deionizer to prevent channeling and below ____ F to prevent breakdown of the resin. |
100 gpm, 120 F |
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What is the difference between units for the Stator Water Cooling Tank cover gas? |
U1 is vented to atmosphere. U2 has a H2 cover gas. |
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Why must stator water temperature be maintained 3 - 4 C above cold gas temperature? |
Condensation can accumulate in the generator if stator water is colder than air. |
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Make up water to the stator cooling water system is: |
1. Demineralized water system (preferred) 2. Hotwell pump discharge |
