GE Industrial Solutions GPS 4848_100 Users Guide (dual rectifier shelf) - Manual (Page 23)

Galaxy Power System 4848/100 with Dual Rectifier Shelf
Issue 5 September 2011 System Description 2 - 3
Architecture
Introduction For the GPS 4848/100 system, the basic system components, i.e., ac
input panels, battery connection panels, dc distribution panels, rectifiers,
and controller, can be configured to form two distinct system
architectures: distributed or centralized.
Distributed In this system each cabinet contains ac distribution, dc distribution
panels, battery connection panels, rectifiers, termination points for load
circuits, and a battery shunt. The initial cabinet also contains the system
controller and, as such, it can function as a stand-alone system. The
rectifier output buses are interconnected to permit cabinets to share
current and ensure common voltage references for all system rectifiers.
Because each cabinet is basically a self-contained system, the overall
system capacity can be increased by simply adding cabinet/battery
entities. However, growing the system requires a distinct, dedicated
floor plan.
During normal operation, the readings from the battery shunts are
summed and subtracted from the rectifier current to obtain the system
load current. While the batteries are providing the system load power,
the individual battery shunts may be monitored to determine the status
of the individual battery sections.
Cabinets can be equipped with load and/or battery disconnect/reconnect
contactors. Battery contactors prevent battery damage during deep
discharges by disconnecting batteries. Load contactors can extend the
time critical loads operate on battery discharge by disconnecting
non-critical loads during discharge.
Figure 2-2 shows an example of GPS 4848/100 components configured
in a distributed architecture; Figure 2-3 gives a front view of the
distributed initial and growth cabinets.