2.13
Date Code 20171021
Instruction Manual
SEL-421 Relay
Installation
Plug-In Boards
An optional Ethernet card provides Ethernet capability for the SEL-421. An
Ethernet card gives the relay access to popular Ethernet networking standards
including TCP/IP, FTP, Telnet, DNP3, IEEE C37.118 Synchrophasors, and
IEC 61850 over local area and wide area networks (the Ethernet card with
IEC 61850 support is available at purchase as a factory-installed option). For
information on DNP3 applications, see
Section 16: DNP3 Communication in the
SEL-400 Series Relays Instruction Manual
. For more information on IEC 61850
applications, see
Section 17: IEC 61850 Communication in the SEL-400 Series
Relays Instruction Manual
.
Plug-In Boards
The SEL-421 is available in many input/output configuration options. The relay
base model is a 3U chassis with main board I/O and screw-terminal connector
connections (see
). Other ordering options include versions of the relay
in larger enclosures (4U or 5U) with all, partial, or no extra I/O boards installed.
NOTE:
Ordering the 4U and 5U relay
with partial or no extra I/O allows for
future system expansion and future
use of additional relay features.
Plug-in communications cards are also available for the SEL-421. The optional
Ethernet card allows you to use TCP/IP, FTP, Telnet, DNP3 LAN/WAN, and
IEC 61850 applications on an Ethernet network. This card is available at the time
of purchase as a factory-installed option or as a factory-installed conversion to an
existing relay.
I/O Interface Boards
You can choose among eight input/output interface boards for the I/O slots of the
4U and 5U chassis. These I/O interface boards are in addition to the main board
I/O described in
. The I/O interface boards are
INT1, INT2, INT3, INT4, INT5, INT6, INT7, and INT8.
,
show the rear screw-terminal connectors associated with these inter-
face boards.
Figure 2.10
INT1 I/O Interface Board
Figure 2.11
INT2 I/O Interface Board
Figure 2.12
INT3 I/O Interface Board
Summary of Contents for SEL-421-4
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