Propulsion System Overview

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posted:: 1/8/2010
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PROPULSION SYSTEM OVERVIEW
GENERAL INFORMATION

Major Components

• Harbormaster Tunnel Thruster
• General Electric Bow Thruster Motor
• Caterpillar D-398 Diesel Engines
• Kato Brushless Synchronous Main AC Generators
• Main Generator AC Filter Modules
• General Electric 600 volt AC switchboard
• General Electric Main Propulsion Motor Forward Journal Bearing
• Waukesha Main Propulsion Motor Aft Journal and Thrust Bearing
• Propulsion Shafts
• Propeller
• Waukesha Forward, Intermediate and Outboard Propulsion Shaft Bearings and
Seals

GENERAL DESCRIPTION

Harbormaster Tunnel Thruster

• Fixed four-bladed propeller.
• Propeller is mounted in an athwart ship tunnel so it can thrust the bow of the
ship toward port or starboard as desired.

General Electric Bow Thruster Motor

• Direct Current (DC).
• Separately excited shunt wound field.
• 550 Horsepower.
• 1200 RPM.
• 750 Volt.
• 590 AMP.
• Reversible.
• The motor is powered by a General Electric Silicon Controlled Rectifier (SCR)
that supplies voltage and current to the armature windings via the pilot
house or winch house throttle controls.
• The shunt field is energized by a constant current Field Excitation Module (FEM).
• The bow thruster motor unit contains:
• 2 HP, 575 volt, 1800 RPM blower motor.
• Internal space heaters.
• Sea water cooled heat exchanger 20 gallon per minute at 75 PSI.
• Tachometer generator (bow thruster RPM) , 50 volts/1 000 RPM.

Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 1
• Air temperature thermometer mounted in the heat exchanger cooler duct.

Caterpillar D-398B Diesel Engines

• Four engines installed in main generator room.
• Each engine is installed on its own skid base and then mounted on a special
sound isolation bed.
• V-12.
• 1200 RPM.
• 970 Horsepower.

Kato Brushless Synchronous Main AC Generators

• 600 KW.
• 600 VAC.
• 3 Phase.
• 60 Hertz.
• 1200 RPM.
• Aircooled.
• 0.7 Lagging power factor.
• Solid state rectifier assembly.
• Field pole windings on the rotor.
• The generator(s) are provided with regulation and compensation for parallel
operation from the GEM (Generator Engine Module).

Main Generator AC Filter Modules

• Mounted along side each generator.
• Filters out spurious voltage spikes (unwanted frequencies) of the fifth and
seventh harmonic that is produced by the main propulsion power converter
units.

General Electric 600 Volt AC Switchboard

• Provides control, protection and distribution of 600 VAC.
• Supplied by constant frequency main AC power generator(s).
• The 600 VAC power is converted to variable Direct Current (DC) voltage, for
use by the propulsion motors, via three (3) independent Silicon Controlled
Rectifier (SCR) converters.
• The 600 VAC bus can be split or combined with any or all of the main
generators operating in parallel.
• Three (3) 600 volt SCR converter input circuit breakers.
• Two (2) power limit modules.
• Propulsion system components of the switchboard:
• Four (4) generator control panels (including the Motor Engine Module [GEM]).
• Port & starboard main motor Power Converter Panels (PCP).

Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 2
• Bow thruster moyor Power Converter Panels (PCP).
• Port & starboard main motor Field Exciter Modules (FEM).
• Bow thruster motor Field Exciter Modules (FEM).
• Four (4) 600 VAC bus tie breakers.

General Electric Propulsion Motors

• Direct Current (DC).
• Shunt wound field, separately excited.
• 800 Horsepower.
• 750 Volt.
• 890 AMP (Armature circuit).
• 10-185 RPM.
• SCR powered from throttle input at MCSC, pilot house & winch house.
• The main propulsion motor(s) ventilation:
• Two (2), 5 HP.
• 575 Volt.
• 3510 RPM.
• 3 Phase
• 60 Hertz blower motors driving buff to centrifugal ventilating fans.
• The propulsion motor ventilation air is cooled via a prefex group
water-to-air heat exchanger.
• Each propulsion motors is controlled by a Signal Electronics Module (SEM).
• The SEM is mounted inside each respective Power Converter Panel (PCP).
• 100 OHM at 0°C Resistance Temperature Device (RTDs) are installed:
• Shunt Field
• Commutating Field
• Air Cooler (Air leaving).
• Two (2) disposable air filters coated with non-migrating dust impinging tackifier
mounted in front of the air cooler to remove larger carbon particles.
• Space heaters are located in the forward and aft end near the bottom.
• The heaters are powered from HVAC power panel P412-5 and controlled by
the SEM. The 600 VAC switchboard must be energized for the space heaters
to operate.
• The motor(s) drive tachometers used for monitoring RPM.
• The following external systems are required for propulsion motor operation:
• Lube oil (aft journal and thrust brg.)
• Sea water (air cooler).

General Electric Forward Journal Bearing

• 6-inch diameter.
• 4.2 inches long.
• Self aligning.
• Electrically insulated.
• Two (2) RTD's.

Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 3
• G.E. temperature relay.

Waukesha Aft Journal and Thrust Bearing

• Combination bearing, flanged mounted.
• Forced oil lubricated.
• Not electrically insulated and acts as shaft ground.
• Since the motor is powered by an SCR, two sliding ground brushes are
mounted on the grounded bearing pedestal.
• Journal bearing
• 8-inch diameter.
• 8-inches long
• Contains two (2) RTD's in the bottom of the bearing.
• Thrust bearing
• The motor shaft is directly coupled to the propeller shaft and transmits
the thrust generated by the propeller to the main thrust bearing.
• Controls end play.
• 16-inch, 10 x 10 pad, self-equalizing, tilting pad.
• Completely flooded with lube oil.
• Two (2) RTD's to measure aft CW and CCW rotation bearing
temperature.
• Two (2) RTD's to measure forward CW and CCW rotation bearing
temperature.
• Fluid flow monitor/switch
• 1.8 GPM (Min).
• Switch wired in series with the L.O. Head Tank LOW alarm.
• Remote reading gas actuated dial thermometer.
• B1-metal dial thermometer.

Propulsion Shafts

• Solid one-piece steel shaft.
• Fifty (50) feet, 10.86 inches long.
• Forward end contains a pressure shrunk coupling assembly.
• Hydraulically operated caliper brake.
• Provisions for inserting a barring iron for manual rotation.
• Shaft supported by:
• Waukesha inboard bearing/seal assembly.
• Waukesha intermediate bearing assembly.
• Waukesha outboard (strut) bearing/seal assembly.

Shaft Seals and Bearings

• Forced lubricated.
• Grease fittings are provided for standby/emergency source of lubrication.

Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 4
Propellers

• Four (4) bladed fixed pitch.
• Counter-rotating (inboard when in the ahead direction).
• Eight (8) feet in diameter.

Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 5
Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 6
Daniel Robson T/V KINGS POINTER Revised: 6/20/01
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Daniel Robson T/V KINGS POINTER Revised: 6/20/01
Chief Engineer Propulsion System Overview Page: 8