U.2.50
SEL-421 Relay User’s Guide Date Code 20090715
Installation
AC/DC Connection Diagrams
You must use a cable and connector rated as Category 5 (CAT 5) to operate the
twisted-pair interface (10/100BASE-T) at 100 Mbps. Because lower
categories are becoming rare and because you may upgrade a 10 Mbps
network to 100 Mbps, we recommend using all CAT 5 components.
Some industrial Ethernet network devices use 9-pin connectors for STP
cables. The Ethernet card RJ-45 connectors are grounded so you can ground
the shielded cable using a standard, externally shielded jack with cables
terminating at the Ethernet card.
AC/DC Connection Diagrams
You can apply the SEL-421 in many power system protection schemes.
Figure 2.46 shows one particular application scheme with connections that
represent typical interfaces to the relay for a single circuit breaker connection.
Figure 2.47 depicts typical connections for a dual circuit breaker protection
scheme.
Courtesy of NationalSwitchgear.com
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