Sel 551 - AC;DC Connection Diagrams for Example Applications; Figure 2.9 SEL-551 Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder (Includes Fast Bus Trip Scheme)

2.9
Date Code 20110408 Instruction Manual SEL-551 Relay
Installation
SEL-551 AC/DC Connection Diagrams for Example Applications
SEL-551 AC/DC Connection
Diagrams for Example Applications
Figure 2.9 SEL-551 Provides Overcurrent Protection and
Reclosing for a Utility Distribution Feeder (Includes Fast Bus Trip Scheme)
52A
C
B
A
TC
52
(-)
Trip
Circuit
Close
Circuit
to Annunciator or RTU
Trip
Coil
(+)
(+)
(+)
52B
Coil
Close
CC
(-)
SEL-551 Relay
IN
IC
IB
IA
IN2
IN1
ALARM
OUT4
OUT3
OUT2
OUT1
Breaker Status
(-)
(Fast Bus Trip Scheme)
86
Lock
(+)
Circuit
Failure
Out
86B
Trip
Breaker
(-)
to Bus Relay
(+)
(+)
52A