C.6
SEL-751 Relay Instruction Manual Date Code 20170927
SEL Communications Processors
SEL Communications Processor and Relay Architecture
Figure C.3 Enhancing Multidrop Networks With SEL Communications
Processors
In this example, the SEL communications processor provides the following
enhancements when compared to a system that employs only the multidrop
network:
➤ Ethernet access for IEDs with serial ports
➤ Backup engineering access through the dial-in modem
➤ IRIG-B time signal distribution to all station IEDs
➤ Integration of IEDs without Ethernet
➤ Single point of access for real-time data for SCADA,
HMI, and other uses
➤ Significant cost savings by use of existing IEDs
with serial ports
SEL Communications
Processor
Modem
To SCADA Control Center,
RTU, or Protocol Gateway
To Engineering
HMI/Local
Engineering
Access
SEL-421 Relay
Hub
Hub
Ethernet IED
SCADA
Ethernet LAN
EIA-232
Engineering
Ethernet LAN
SEL-751 Relay SEL Relay Non-SEL IED
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