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 TM 55-1925-273-10-1
0033 00
A bus tie transfer breaker isolates the emergency switchboard from the main switchboard upon loss of service power. The
bus tie breaker is located in the emergency switchboard and allows emergency power to be supplied through the emergency
switchboard.
In port, the LT is capable of receiving 440 Vac shore power through a shore power cable terminating at a shore power
connector. When connected, the shore power cable supplies both the main switchboard and the emergency switchboard.
SHIP'S SERVICE DIESEL GENERATOR (SSDG) SET
GENERAL
Each ship's service generator consists of a diesel engine, which is directly coupled to its generator. The engine and generator
are mounted on a common foundation.
SHIP'S SERVICE DIESEL GENERATOR ENGINE
A turbocharged V8 diesel engine provides power to the generator. The port ship's service diesel generator engine 2 is air-
started while the starboard diesel generator engine 1 is electrically started. Engine control and monitoring are provided from
the EOS and local control panel.
SHIP'S SERVICE DIESEL GENERATOR
Two 275-kW brushless exciter generators provide 440 Vac, 3-phase, 60 Hz power to the main switchboard. Each generator
is capable of providing 110 percent of the necessary at-sea load for the propulsion and safety of the vessel under normal
conditions. The generators may be operated in parallel; however, normal operation has one generator on line. For parallel
operation, controls necessary to parallel the generators are provided on the main switchboard, located in the EOS.
EMERGENCY DIESEL GENERATOR (EDG) SET
General
The emergency diesel generator set consists of a diesel engine that is directly coupled to the emergency generator. The
engine and generator are mounted on a common foundation.
EMERGENCY DIESEL GENERATOR ENGINE
An in-line 4-cylinder diesel engine provides power to the emergency generator. The engine is electrically started (24 Vdc),
has its own lubricating oil, cooling and fuel oil systems. The engine is cooled by a fresh water cooling system utilizing a
radiator for heat transfer. Jacket water heater is provided for cold weather starting. Switchboard automatic bus transfer
equipment automatically opens the bus tie circuit breaker, starts the engine, and closes the emergency generator breaker
when power is lost from the main switchboard.
EMERGENCY DIESEL GENERATOR
The emergency diesel generator provides power (440 Vac, 3-phase, 60 Hz, 65 kW) to the emergency switchboard within 20
seconds of a ship's service power system failure.
SHORE POWER CONNECTOR
A shore power connector (440 Vac, 400 amps) is located on the main deck, aft of the exterior bulkhead. The shore power
connector provides the capability of connecting the vessel's electrical system to a shore power source.
END OF WORK PACKAGE
0033 00-2
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