Siemens ET8 Series Dokumentacja Pobierz pdf (Strona 47)

CHAPTER 3

AC POWER DISTRIBUTION SYSTEM

Almost every function performed aboard a naval

ship depends upon electric power for its accomplish-

ment From the launching of missiles against an

aggressive force to baking bread for lunch, electric

power is vital to a ship’s ability to accomplish its

mission.

The ship’s service electric plant is equipment that

takes the mechanical power of a prime mover and

converts it to electrical energy. The prime mover may

be driven by steam, gas turbine, diesel, or motor. The

mechanical energy of the prime mover is converted to

electrical energy in the ship’s service generators.

These generator sets supply power to the ship’s ac

power distribution system for further distribution to

the various electrical loads throughout the ship.

The ac power distribution system aboard ship

consists of the following:

• Ac power plant.

• Switchboards that distribute the power.

• The equipment that consumes the power.

The power distribution system is comprised of the

following:

• Ship’s service power distribution system.

• Emergency power distribution system.

• Casualty power distribution system.

ELECTRICAL DISTRIBUTION

SYSTEM

The electrical distribution system is the link

between the ship’s source of electrical power and the

ship’s electrical loads. Power is normally supplied

from the ship’s own generators but can be supplied

from an external source through the shore power

cables.

Most ac power distribution systems in naval ships

are 450-volt, three-phase, 60-Hertz, three- wire

systems.

Bus ties interconnect the ship’s service generator

and distribution switchboards so any switchboard can

be connected to feed power from the generators to one

or more of the other switchboards allowing the

generators to operate in parallel.

In large installations (fig. 3-1), power from the

generators goes through distribution switchboards or

Figure 3-1.-Power distribution in a large combatant ship.

3-1

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