ABB REX 521 - Page 182

182
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 10.2.1.-2 Connection overview diagram of the incoming feeder
CB
DC
REX 521
1
0
0 1
5
0,2
v
100V
Uo
b
A
N
da
dn
OverviewIncM01
Circuit-breaker failure
protection
TRIP circuit breaker
CLOSE circuit breaker
Internal relay fault
OC blocking signal to
the HV relay (3I>> START)
OC blocking signal
from the outgoing feeders
to the 3I>>> stage
Second settings
Uo>> TRIP to the outgoing
feeders
Uo>> Start to release blocking
of outgoing feeders