ABB REX 521 - Page 157

1MRS751802-MUM
REX 521
157
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 9.3.1.-2 Connection overview diagram of the incoming feeder
REX 521
CB
DC
1
0
0 1
OverviewTrans
Circuit-breaker failure
protection
TRIP circuit breaker
CLOSE circuit breaker
Internal relay fault
OC blocking signal from
the MV relay to the 3I>> stage