GE Industrial Solutions GPS 4812_24 - Manual (Page 22)

Galaxy Power System 4812/24
2 - 2 System Description Issue 9 Januray 2008
Overview, continued
System
Components
The power system accepts alternating current from the commercial
utility or a standby ac power source and rectifies it to produce dc power
for the using equipment. The system’s control and alarm functions
interact with the rectifiers and the office. In addition, the system
provides overcurrent protection and charge, discharge, and distribution
facilities. Battery reserve automatically provides a source of dc power if
the commercial or standby ac fails. Battery reserve can be engineered to
supply dc power for a specific period of time. In normal practice, battery
capacity is sized to provide 3 to 8 hours of reserve time.
AC Input connects the commercial and/or standby ac power sources to
the rectifiers within the system and provides overcurrent protection. In
some applications the ac service is wired directly to the rectifiers and
overcurrent protection is provided at the service panel.
Rectifiers convert an ac source voltage into the dc voltage level required
to charge and float the batteries and to power the using equipment.
Controller provides the local and remote control, monitoring, and
diagnostic functions required to administer the power system.
Batteries provide energy storage for an uninterrupted power feed to the
using equipment during loss of ac input or rectifier failure.
DC Distribution Panel provides overcurrent protection, connection
points for the using equipment, and bus bars used to interconnect the
rectifiers, batteries, and dc distribution.
Battery Connection Panel provides connection points for the battery
strings through battery disconnect fuses or contactors and current
monitoring shunts.