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 mountedin 19 “racks (up to two bay units each rack), according to

the size of the busbar system in one or more cubicles (seeFigure 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 thesame 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.