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SP1 > SP3 > Flashcards

SP3 Flashcards

1
Q

Why is DC unsatisfactory for SM’s main distribution system?

A
  • DC much larger and heavier
    than AC machines
  • DC limited by commutation difficulties - Defects + Maintenance
  • Battery heavy 500kg per cell and limited capacity
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2
Q

Name typical ESS loads

A
  • Lighting
  • Tank contents
  • Anti condensation heaters
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3
Q

Name 115v Non Ess loads

A
  • Sockets

- Domestic equipment

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4
Q

5 power sources available to V Boats

A
  • 265v DC main battery
  • Two 3MW TG’s
  • One 850Kw AC DG
  • One 750Kw DC DG
  • AC Shore Supply
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5
Q

How do we protect against main types of damage ?

A
  • Regular samples and monitoring of water conditions kept to strict limits
  • Reactor protection system used that shuts down reactors if parameters hit
  • Restrictions on warm up and cooldown rates
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6
Q

Different colours on MSC BITE monitoring system

A

Green - Within correct tolerance
Amber - Warming up fault that may lead to trip
Red - Out of tolerance and trip
Blue - Mode indication

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7
Q

Describe AC and DC parts on MG

A
  • AC machine is on 8 pole brushless machine with incorporated PMG and exciter on the main shaft. MK204CP
  • DC is a compound wound DC MG controlled by MK 84 AVFR
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8
Q

Briefly tabulate the process required to carry out CD

A
  • Battery is put through a charging cycle and then discharged in a controlled manner to low state of charge
  • To complete the process it is then recharged to full .
    Improves condition of battery and provides capacity check
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9
Q

Occasions when Welding, Grinding , Burning stop

A
  • Battery above gassing voltage 288v
  • Battery temp exceeds 46
  • Less than 1 hour since charge complete
  • H2 content meters indicate 2%
  • Loss/Reduction of airflow or equipment failure
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10
Q

Prerequisites for battery change alongside

A
  • Vent system lineup check
  • Battery airflow > 0.63m3/sec to 0.72m3/sec
  • H contents measuring system in operation indicating <1%
  • DC system clear of earths
  • Electrolyte agitation system running
  • Pilot cell readings taken + recorded
  • Battery sump dry
  • At least one CO + H2 burners running in vent state green
  • Hydrogen clearance fans running
  • EOOD permission
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11
Q

Tripping conditions for the DG DC breaker

A
  • IPBS off / reset switch
  • Breaker manual push trip switch
  • Low voltage
  • Overcurrent
  • Reverse current
  • Speed below 200rpm
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12
Q

Tripping conditions for AC DG BKR

A
  • IPBS off / reset switch
  • Breaker manual push to trip switch
  • Low voltage
  • Overcurrent
  • Generator fault
  • Reverse power
  • DG excitation off/on switch
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13
Q

Explain what AC and DC diesels are

A
  • AC gen consists of a brushless rotating field alternator at 850Kw
  • DC gen is comprised of shunt wound , 8 pole self exciting type and is coupled/driven by a paxman valenta at 1200rpm
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14
Q

How many cables are used for SS

A
  • DC 4 cables

- AC 8 cables

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15
Q

When would you connect DCSS

A
  • When reactor is shutdown and DGs unavailable

- Long term failure of AC shore supply

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16
Q

Differences between AC + DC breaker

A
  • Closing coil supply is taken directly from DC busbar and a DC+DC converter provides 50v for the retaining circuit CCCC
  • Buffer amplifier monitors the FV voltage and converts it to AC output for use in overcurrent
  • Centre main isolating contact is not used as the supply requires two connections
17
Q

Two types of ACB

A
  • IFR6
  • IFR3
  • IF6
18
Q

List supplies or converted supplies onboard

A
  • 450v 60Hz AC 3 Phase
  • 265v DC
  • 115v 60Hz 3 phase
  • 160v DC
19
Q

List 4 typical 115v Ess or non-ess loads

A

ESS - Lighting - Anti condensation heaters
Non- ESS - Domestic equipment
Sockets

20
Q

Different types of compartment lighting

A

Primary Source: 115v 60Hz fluorescent lighting
Secondary Source: 265v DC Incandescent
Emergency Source: AEL

21
Q

Audible alarms that need urgent attention

A

MFA
Fire
Flood
GWS

22
Q

Methods of propulsion

A
  • EPM controlled local at control cubicle remote at MCD

- SPM controlled locally at hydraulic manifold in engine room remote from ESP in manoeuvring

SP1 (2 decks)

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