3
Date Code 20010214
SEL-2505 Remote I/O Module
Applications
Applications
Figure 2
Channel Interface I/O for Relays
Without Native M
IRRORED
B
IT
Protocol.
Figure 3
Provide Communications-Assisted Tripping
Over Existing Digital Communications Networks.
f
Figure 4
Interface Relays with M
IRRORED
B
ITS
to Relays Without.
IN
+DC
—DC
SEL-2505 (partial)
RELAY 1
(partial)
Fiber
+DC
—DC
RELAY 2
(partial)
RX
TX
RX
TX
SEL-2505 (partial)
IN
IN
IN
Fiber-Optic
Mux
SEL-2505
2800
Relay
Fiber-Optic
Mux
SEL-2505
2800
Relay
Digital
Network
Interface
SEL-311C
Digital
Network
Interface
SEL-2505
2800
EM
Relay
Digital
Communications
Network
Add communications-
assisted tripping to
existing relays.
Add alternate commu-
nications channel to
pilot trip schemes.
Isolated remote-
tripping via
fiber-optic links.
Cross-trigger
event reports.
Perform auxiliary
relay functions while
adding self-testing
capabilities.
Create bus protection
using existing protec-
tion relays for simple
busses.
Include an SEL-2100
for bus protection of
larger busses.
Add direct transfer
trip to existing
cogeneration
interconnections.
Provide low-cost
teleprotection over
digital multiplexers.
Provide a migration
path from
electromechanical
relays to M
IRRORED
B
ITS
relays.
