ABB REX 521 Technical Reference Manual, Standard Configurations

162
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 9.3.4.2.-1 Connection diagram for the standard configuration B01 with
breaker status indication, blocking, control and breaker failure
signals.
9.3.5. Blocking signal overview
To clarify the blockings between the different levels in the first three application
examples (Section 9.1. Outgoing feeder, Basic B01, Section 9.2. Incoming feeder,
Basic B01 and Section 9.3. Transformer feeder, Basic B01) the signals are presented
in the figure below.
CB
REX 521
Circuit breaker failure
protection
TRIP circuit breaker
CLOSE circuit breaker
DC
1
0
0
1
OC-blocking signal from
MV-relay to 3I>> stage
CBstatusD

ABB REX 521 Specifications

General

Brand	ABB
Model	REX 521
Category	Other
Language	English