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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
POWER GENERATION SYSTEM
GENERAL
The power generation system provides the LT with service power of 440 Vac, 3-phase, 60 Hz, 275 kW and emergency power
of 440 Vac 3-phase, 60 Hz, 65 kW. Service power is generated by one or both of the ship's service diesel generator (SSDG)
sets. The SSDG supplies power to the main switchboard and the emergency switchboard through a bus tie circuit breaker.
The emergency diesel generator produces emergency power for continued operation of vital systems and equipment should
loss of service power occur. Refer to figure 1 for an overall block diagram of the power generation system.
SHORE
POWER
440 VAC
SHIP SERVICE
SHIP SERVICE
DIESEL
DIESEL
SHORE
GENERATOR
GENERATOR
POWER
(SSDG)
(SSDG)
CONNECTOR
2
1
PRIMARY
MAIN SWITCHBOARD
POWER
440/120V
STEP-DOWN
(3)
EMERGENCY
SWITCHBOARD
BUS TIE
ENGINE ROOM
LOAD CENTER
DISTRIBUTION
PANEL
EMERGENCY
EMERGENCY SWITCHBOARD
POWER
440/120V
EMERGENCY
STEP-DOWN
DIESEL
GENERATOR
(3)
(EDG)
ENGINE ROOM
LOAD CENTER
DISTRIBUTION
PANEL
Figure 1. Power Generation System Block Diagram
0033 00-1
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