ABB Relion REB500, Product Manual, Page: 9 / 50

Distributed busbar protection REB500 1MRK 505 352-BEN
Product version: 8.2 Issued: 2016-03-01
Revision: -
ABB 9
3. Mode of installation
There are three versions of installing the numerical busbar
protection REB500:
Distributed installation
In this case, the bay units are installed in casings or
cubicles in the individual switchgear bays distributed
around the station and are connected to the central
processing unit by optical fiber cables (see Figure 5). The
central processing unit is normally located in a central
cubicle or in a central relay room.
Centralized installation
The central processing unit and the bay units are mounted
in 19"racks (up to two bay units each rack), according to
the size of the busbar system in one or more cubicles (see
Figure 6). A centralized installation is the ideal solution for
upgrading existing stations, since very little additional
wiring is required and compared with older kinds of busbar
protection, much more functionality can be packed into the
same space.
Combined centralized and distributed installation
Basically, the only difference between a distributed and a
centralized scheme is the mounting location of the bay
units and therefore it is possible to mix the two
philosophies.
Figure 5. Distributed installation