ABB REX 521 - Incoming Feeder, Medium M01; Features

180
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
Fig. 10.1.4.5.-1 Connection diagram for the standard configuration M01 with
breaker status indication, control and alarm signals.
10.2. Incoming feeder, Medium M01
10.2.1. Features
This application example describes an incoming feeder to a single busbar including:
• Overcurrent protection
• Residual voltage protection
The network is either compensated earthed or isolated. The three-phase current
measurement is established with current transformers and the residual voltage is
measured with a set of voltage transformers in an open-delta connection.
CB
REX 521
Circuit breaker failure
protection
Blocking signal to incoming feeder
(START 3I>>)
TRIP circuit breaker
CLOSE circuit breaker
DC
ES
0
1
Overcurrent TRIP Alarm
Earth-fault TRIP Alarm
Control signal for selecting
the basic angle of Io>-->
(BACTRL)
CBstatusF