1MRS751802-MUM
REX 521
155
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 9.2.4.6.-1 Connection diagram for the standard configuration B01 with the
breaker-status indication, blocking-, control- and breaker failure
signals.
9.3. Transformer feeder, Basic B01
9.3.1. Features
This application example describes a transformer feeder including:
• Overcurrent protection
• Inrush protection
The application described in this example can serve as a backup protection for a
differential protection of the transformer or as main protection for smaller
transformers.
CB
REX 521
OC-blocking signal
from outgoing-feeders
to 3I>>> stage
Circuit breaker failure
protection
Io>>> TRIP to breaker on
HV side of transformer
TRIP circuit breaker
CLOSE circuit breaker
DC
1
0
0
1
CBstatusC
OC-blocking signal to
HV-relay (3I>> START)
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