Additional plug-and-play functionality

Bay units can be added to an existing REB500 system in a simple way.

Due to the modular and flexible architecture of the software, integration of new units is easily achieved.

In the event of a failure, a bay unit can be easily replaced.

During system startup the new bay unit requests its address, this can be entered directly via its LHMI.

The necessary setting values and configuration data are then downloaded automatically Central unit (500CU04)

The hardware structure is based on a closed, monolithic casing.

The central unit is the system manager, i.e. it configures the system, contains the busbar replica, assigns bays

within the system, manages the sets of operating parameters, acts as REB500 process bus controller,

assures synchronization of the system and communicates with the station control and monitoring system.

The variables for the busbar protection function are derived dynamically from the process data provided by the bay units.

The process data is transferred to the central processor via the REB500 process bus interface.

The central unit is able to handle data from up to 60 bay units and evaluate up to 32 bus zones.

In addition to processing the protection zone data, the central unit provides a disturbance recorder for all 32 bus

zones, recording the main data of the busbar protection to facilitate quick fault analysis.

The central unit offers 9 binary inputs and 19 binary outputs for central commands and signals (e.g. external

bus zone trip, trip-reset etc.). Additional 9 binary inputs and 9 binary outputs are optional available.

The central unit comprises a local HMI with 15 programmable LEDs (Figure 8) including a front Ethernet

port for HMI connection within the local area network.