Podcast
Questions and Answers
What is the primary function of the SB sections on the ship?
What is the primary function of the SB sections on the ship?
- To act as a stand-alone unit for emergency power.
- To house generator breakers and ground detectors.
- To provide power distribution to specific zones.
- To house only their associated BTBs and integrate with specific LC sections. (correct)
How many shore power receptacles are used for the ship's normal operation?
How many shore power receptacles are used for the ship's normal operation?
- 12
- 4
- 2
- 10 (correct)
Which of the following Load Centers is NOT located in Zone 2 (Frames 126-220)?
Which of the following Load Centers is NOT located in Zone 2 (Frames 126-220)?
- 1SA/LC21
- LC28A
- LC31 (correct)
- LC26
Where are the shore power breakers located?
Where are the shore power breakers located?
What is the purpose of the Casualty Power Distribution System?
What is the purpose of the Casualty Power Distribution System?
What is the primary purpose of the Load Centers on the ship?
What is the primary purpose of the Load Centers on the ship?
What is the difference between the 1SB and 2SB sections?
What is the difference between the 1SB and 2SB sections?
Which of the following statements about the SG sections is TRUE?
Which of the following statements about the SG sections is TRUE?
What are the two stages of Load Shed in the 60 Hz Distribution system?
What are the two stages of Load Shed in the 60 Hz Distribution system?
Which of these is NOT a breaker tripped during Stage 1 of Load Shed?
Which of these is NOT a breaker tripped during Stage 1 of Load Shed?
What is the rating of each of the three Ship Service Gas Turbine Generators?
What is the rating of each of the three Ship Service Gas Turbine Generators?
Where is the 2SA section of the Switchboard located?
Where is the 2SA section of the Switchboard located?
Which of these is NOT a function of the 60 Hz Power Distribution System?
Which of these is NOT a function of the 60 Hz Power Distribution System?
What is the purpose of the RIMSS system in the Ship Service Gas Turbine Generators?
What is the purpose of the RIMSS system in the Ship Service Gas Turbine Generators?
What is the function of the Cross Tie Breakers (XTBs) within the Switchboard sections?
What is the function of the Cross Tie Breakers (XTBs) within the Switchboard sections?
What happens when an overload condition is detected in the distribution system?
What happens when an overload condition is detected in the distribution system?
Flashcards
60 Hz Power Distribution System
60 Hz Power Distribution System
Distributes 450 Volts AC and 60 Hz power on a ship.
Load Shedding
Load Shedding
A protective feature that removes non-vital loads during overloads.
Stage 1 Load Shed
Stage 1 Load Shed
Disconnects non-vital loads for 100 milliseconds at overload.
Stage 2 Load Shed
Stage 2 Load Shed
Signup and view all the flashcards
GTG (Gas Turbine Generator)
GTG (Gas Turbine Generator)
Signup and view all the flashcards
Switchboards
Switchboards
Signup and view all the flashcards
COTS MFM
COTS MFM
Signup and view all the flashcards
Redundant Independent Mechanical Start System (RIMSS)
Redundant Independent Mechanical Start System (RIMSS)
Signup and view all the flashcards
SB Sections
SB Sections
Signup and view all the flashcards
1SB Section
1SB Section
Signup and view all the flashcards
Shore Power
Shore Power
Signup and view all the flashcards
Load Centers
Load Centers
Signup and view all the flashcards
Casualty Power
Casualty Power
Signup and view all the flashcards
Power Distribution Zones
Power Distribution Zones
Signup and view all the flashcards
2SP Switchboard
2SP Switchboard
Signup and view all the flashcards
Generator Controls
Generator Controls
Signup and view all the flashcards
Study Notes
60 Hz Distribution ESWS Function
- The system reliably distributes 450 Volts AC, 60 Hz power to all ship locations.
- Power is sourced from three SSGTGs or shore power cables.
- The system includes 12 shore power receptacles.
Load Shedding
- A protective feature against overload conditions.
- Non-vital loads are tripped first, followed by vital loads if the overload persists.
- Two stages of load shedding:
- Stage 1: 100% rated load for 100 milliseconds.
- Stage 2: 100% rated load for an additional 5 seconds after stage 1.
Breakers Tripped for Stage One Load Shed
- Ventilation equipment
- Preheaters
- Galley equipment
- General work shop
- Laundry
- Non-vital engineering equipment
Breakers Tripped for Stage Two Load Shed
- Air conditioning units
- VLS Anti-icing heaters
- SPY-1D Anti-icing heaters
Ships Service Gas Turbine Generators (GTGs)
- Three GTGs, Rolls Royce 9140RF Generator sets.
- Each rated at 3,000 kW, 4,800 amps, 3 phase, 450 volts, and 60Hz.
- Generator locations:
- GTG 1: AUX 1
- GTG 2: MER 2
- GTG 3: NR 3 GTG Room
Switchboards
- Three ship service switchboards (1S, 2S, and 3S) for zonal distribution of 60Hz, 450Vac, 3-phase power.
- Each switchboard is divided into three sections: SG, SA, SB.
- Additional 2SP section on switchboard 2S for shore power.
- Integrated with load centers (LCs) at specific locations.
- Specific switchboard sections house only their associated cross-tie breakers (XTBs).
- Locations:
- 1SA: 4-126-0-E (Aux 1)
- 2SA: 4-254-0-E (Mer 2)
- 3SA: 3-370-0-E (3 GTG Room)
- 1SB: 1-158-4-Q (NR 1 SWBD Room)
- 2SB: 1-254-2-Q (NR 2 SWBD Room)
- 3SB: 01-338-2-Q (NR 3 SWBD Room)
Shore Power
- Supplied via 12, 400-amp receptacles located on 01 level amidships.
- 10 receptacles typically used, for 4000 amps.
- Breakers are located in the 2SP switchboard in MER 2.
Load Centers
- Extensions of switchboards for zonal distribution.
- Connected to one power source (SWBD).
- Odd-numbered units on starboard, even-numbered on port.
- Six power distribution zones on USS RALPH JOHNSON.
Casualty Power
- Temporary 60 Hz power to vital equipment.
- Strategically located cables for power to span damaged areas.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
