exchange between the REX640s takes place using IEC
61850-8-1 binary and analog GOOSE signaling over Ethernet.
The LHMI panels of REX640 can be used as local user interface
for circuit breaker synchronization. The upper-level remote
control systems like SCADA, DCS or PMS can interact with the
synchronizing scheme using MMS or Modbus protocols. The
REX640-based synchronizing scheme supports manual, semi-
manual and automatic synchronizing modes.
When the synchronizing scheme includes both generator and
non-generator CBs, the maximum size of the supported system
is eight generator and 17 non-generator CBs.
GUID-E302427A-35A5-4CA0-AAED-75308A388E23 V1 EN
Figure 11. Busbar protection application
F
igure 11 presents REX640 in a phase-dedicated high-
impedance busbar protection application for a double busbar
switchgear. The relay’s base functionality is enhanced with the
busbar protection application package (APP9). The two AIM2
cards in the relay provide a total of 12 current channels. In the
example, 9 out of the 12 current channels are used to create
three busbar protection zones. Zones A and B provide selective
protection for Bus A and Bus B, respectively. The third zone,
called check zone, covers both busbars. The check zone works
as the final trip release condition for the selective zones; it
provides security against false trip commands initiated by the
selective zones, for example, due to a fault within the
disconnector’s auxiliary switch circuitry. The current
transformers’ secondary buswires for the three protection
zones are supervised by dedicated functions within the relay.
1MRS759144 A
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