Page 22
© Copyright 2021 ABB. All rights reserved.
4.
System Electrical Architecture Overview
Introduction
This section is a basic system overview of the architecture of Galaxy Power Systems. The overview
provides information about the connections and physical considerations of the systems that must be
understood before the installation process begins.
The GPS individual cabinets may be connected together in two basic architectures, distributed or
centralized, to form systems. These two architectures contain the same basic modules, but are
arranged in different cabinet configurations
Bonding Network
GPS systems are suitable for installation as part of a Common Bonding Network (CBN) or an Isolated
Bonding Network (IBN).
In this manual Battery Return grounds labeled "System (CO) ground" are "Isolated DC return (DC
-
I)".
Installation as part of a Common Bonding Network (CBN) or an Isolated Bonding Network (IBN) is
determined by the point external to the GPS system connected to GPS "System (CO) ground".
Facility
GPS systems are suitable for installation in Network Telecommunication Facilities and locations where
NEC applies.
Single
-
Cabinet Distributed
System
Single
-
cabinet distributed systems are illustrated in Figure 4
-
1.
Note:
A single shunt is used in this power system configuration to
monitor the battery charge (
-
polarity) or discharge
(+ polarity) currents. The shunt readings are summed with the
rectifiers’ currents by the system controller to determine the
plant’s total load current.
Figure 4
-
1: Single
-
Cabinet Configuration, Distributed Architecture
Battery
shunt
