60 Hz Distribution and Load Shedding Quiz
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Questions and Answers

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?

  • 12
  • 4
  • 2
  • 10 (correct)

    • 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?

    <p>Both at the UCC and locally at the 2SP-switchboard (C)</p> Signup and view all the answers

    What is the purpose of the Casualty Power Distribution System?

    <p>To provide temporary 60 Hz power to vital equipment and systems. (B)</p> Signup and view all the answers

    What is the primary purpose of the Load Centers on the ship?

    <p>To provide centralized zonal distribution of power. (A)</p> Signup and view all the answers

    What is the difference between the 1SB and 2SB sections?

    <p>The 2SB is stand-alone, while the 1SB is integrated with an LC section. (D)</p> Signup and view all the answers

    Which of the following statements about the SG sections is TRUE?

    <p>They contain controls for generators, generator breakers, and ground detectors. (C)</p> Signup and view all the answers

    What are the two stages of Load Shed in the 60 Hz Distribution system?

    <p>Stage 1: 100% load for 100 milliseconds, Stage 2: 100% load for 5 seconds after Stage 1 (D)</p> Signup and view all the answers

    Which of these is NOT a breaker tripped during Stage 1 of Load Shed?

    <p>Air Condition Units (A)</p> Signup and view all the answers

    What is the rating of each of the three Ship Service Gas Turbine Generators?

    <p>3,000 KW, 4,800 AMPS, 3 PHASE, 450 VOLTS, and 60Hz (B)</p> Signup and view all the answers

    Where is the 2SA section of the Switchboard located?

    <p>MER 2 (B)</p> Signup and view all the answers

    Which of these is NOT a function of the 60 Hz Power Distribution System?

    <p>Monitoring the health of the ship's electrical system (D)</p> Signup and view all the answers

    What is the purpose of the RIMSS system in the Ship Service Gas Turbine Generators?

    <p>Providing a redundant mechanical starting system (B)</p> Signup and view all the answers

    What is the function of the Cross Tie Breakers (XTBs) within the Switchboard sections?

    <p>Allowing power transfer between different sections of the switchboard (B)</p> Signup and view all the answers

    What happens when an overload condition is detected in the distribution system?

    <p>The system automatically activates Load Shed, first tripping non-vital loads, then vital loads if necessary (A)</p> Signup and view all the answers

    Flashcards

    60 Hz Power Distribution System

    Distributes 450 Volts AC and 60 Hz power on a ship.

    Load Shedding

    A protective feature that removes non-vital loads during overloads.

    Stage 1 Load Shed

    Disconnects non-vital loads for 100 milliseconds at overload.

    Stage 2 Load Shed

    Disconnects vital loads for an additional 5 seconds after Stage 1.

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    GTG (Gas Turbine Generator)

    Generators using gas turbines to produce electrical power.

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    Switchboards

    Distribute 60Hz, 450VAC, 3-phase power across ship areas.

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    COTS MFM

    Common off-the-shelf Modular Function Module that manages power loads.

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    Redundant Independent Mechanical Start System (RIMSS)

    Backup system for starting gas turbines reliably.

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    SB Sections

    Areas housing associated BTBs outside main spaces.

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    1SB Section

    Integrated with LC 22, located in 1-158-4-Q.

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    Shore Power

    Power supplied via twelve 400-amp receptacles.

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    Load Centers

    Extensions of switchboards for zonal distribution.

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    Casualty Power

    Temporary 60 Hz power for vital systems during emergencies.

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    Power Distribution Zones

    Specific areas on the ship identified by odd/even units.

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    2SP Switchboard

    Controls power from the shore power receptacles.

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    Generator Controls

    Controls for generators and breaker controls in SG sections.

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    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.

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    Related Documents

    60 Hz Distribution ESWS PDF

    Description

    Test your knowledge on the 60 Hz power distribution system and load shedding procedures aboard ships. This quiz covers the function of SSGTGs, critical load shedding stages, and the equipment involved. Prepare to evaluate your understanding of electrical systems used in marine environments.

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