4-15
include ELECTRICAL POWER, DRY-AIR, and LIQUID-COOLING SYSTEMS. Without these support
systems, radars could not function. Therefore, you must be aware of these support systems and understand
their relationship to your radar equipment.
ELECTRICAL POWER
Let us now look at a typical ship's power distribution system. The power system on your ship or
aircraft is probably similar in many ways. We will briefly discuss an overall power distribution system
and the areas that are closely related to radar equipment.
Power Distribution System
Most ac power distribution systems in naval vessels are 440-volt, 60-hertz, 3-phase, 3-wire,
ungrounded systems. The ac power distribution system consists of the power source, equipment to
distribute the power, and the equipment which uses the power. A partial distribution chart is shown in
figure 4-11.
Figure 4-11.—60 Hz distribution.
The power source can be the ship service turbine generator or the emergency diesel generator. Power
is normally distributed through the ship service distribution switchboards and power panels. Some large
ships also use load centers (not shown) that function as remote switchboards.
