GE Industrial Solutions GPS 4848_100 Users Guide (single rectifier shelf) - Manual (Page 21)

Galaxy Power System 4848/100 with 595 Series Rectifiers S1:3 and later
Issue 10 February 2008 System Description 2 - 3
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
current. While the batteries are providing the system load power, the
individual shunt 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.
Figure 2-2: Distributed Architecture
Control
and
Monitor
Battery Shunt
To Loads
Battery String