188
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 10.2.5.7.-1 Connection diagram for the standard configuration M01 with
breaker status indication, control and alarm signals.
10.3. Outgoing feeder, Medium M02
10.3.1. Features
This application example describes an outgoing feeder of a single busbar including:
• Auto-reclosure function
• Overcurrent protection
• Directional earth fault protection
• Phase discontinuity protection
• Thermal overload protection for cable/line
The network is either compensated or isolated. Three-phase current measurement is
established with a set of current transformers and the neutral current is measured
with a cable transformer. The residual voltage is measured with a set of voltage
transformers in an open-delta connection.
CB
REX521
OC-blocking signal
from outgoing-feeders
to 3I>>> stage
Circuit-breaker failure
protection
OC-blocking signal to
HV-relay (3I>> START)
TRIP circuit breaker
CLOSE circuit breaker
DC
1
0
0
1
Uo>> TRIP to outgoing feeders
Second settings
CBstatusG
Uo>> Start to release blocking
of outgoing feeders
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