CHAPTER 2
UNINTERRUPTED POWER SUPPLY SYSTEMS
The propulsion control consoles on gas turbine-
The UPS systems used on gas turbine-powered
ships will be different for each class of ship. The main
powered ships require a constant power source. Most of
purpose for all UPS systems, however, is the same: to
these consoles cannot withstand an interruption of this
supply backup power to vital equipment when the
power source. If power is removed, the main fuel valve
normal power supply fails. In the following paragraphs,
on the GTE will close, causing the GTE to shut down.
we will briefly discuss the operation and components of
This is why an uninterrupted power supply to the control
these systems and the different configurations you will
consoles is so important. It keeps the engineering plant
find among the different classes of ships.
operating at maximum efficiency.
G a s turbine-powered ships are equipped with
battery backup systems. These systems provide an
DD-963, DDG-993, AND CG-47 CLASS
alternate, short-term power source to vital pieces of
SHIPS
equipment when a failure of normal ship's service
T h e UPS system for DD-963, DDG-993, and
power occurs. The control consoles, especially, will
CG-47 class ships supplies emergency dc power to
require an immediate source of backup power. Because
maintain operation of critical ship control systems
the battery backup system must have a rapid method of
during loss of normal ac power. The UPS can supply a
transferring the load to the backup, electronic switching
nominal value of 150 volts dc to the control consoles for
is used. Electronic switching allows backup power in
about 30 minutes.
the form of an uninterrupted power supply to be sent to
the control consoles. Consequently, the battery backup
Figure 2-1 shows a typical UPS system used on
system used on gas turbine-powered ships is
DD-963, DDG-993, and CG-47 class ships. The UPS
appropriately called the uninterrupted power supply
originates from a bank of lead-acid storage batteries
located in the ship's control UPS battery room. This
(UPS).
Figure 2-1.--Diagram of UPS system for DD-963, DDG-993, and CG-47 class ships.
2-1
