Sel 421 - Page 43

Date Code 20090715 User’s Guide SEL-421 Relay
Section 1
U.User’s Guide
Introduction and Specifications
The SEL-421 Relay is a high-speed transmission line protection relay
featuring single-pole and three-pole tripping and reclosing with synchronism
check, circuit breaker monitoring, circuit breaker failure protection, and
series-compensated line protection logic. The relay features extensive
metering and data recording including high-resolution data capture and
reporting.
The SEL-421 features expanded SEL
OGIC
®
control equation programming for
easy and flexible implementation of custom protection and control schemes.
The relay has separate protection and automation SEL
OGIC control equation
programming areas with extensive protection programming capability and
1000 lines of automation programming capability. You can organize
automation of SEL
OGIC control equation programming into 10 blocks of 100
program lines each.
The SEL-421 provides extensive communications interfaces from standard
SEL ASCII and enhanced M
IRRORED BITS
®
communications protocols to
Ethernet connectivity with the optional Ethernet card. With the Ethernet card,
you can employ the latest industry communications tools, including Telnet,
FTP, IEC 61850, and DNP3 (serial and LAN/WAN) protocols.
Purchase of an SEL-421 includes the
ACSELERATOR QuickSet
®
SEL-5030
Software program.
ACSELERATOR QuickSet assists you in setting,
controlling, and acquiring data from the relays, both locally and remotely.
ACSELERATOR Architect
®
SEL-5032 Software is included with purchase of
the optional Ethernet card with IEC 61850 protocol support.
ACSELERATOR
Architect enables you to view and configure IEC 61850 settings via a GUI
interface, tightly integrated with
ACSELERATOR QuickSet.
Synchrophasor measurements are available when a high-accuracy time source
is connected to the relay. The SEL-421 supports the IEEE C37.118, Standard
for Synchrophasors for Power Systems.
A simple and robust hardware design features efficient digital signal
processing. Combined with extensive self-testing, these features provide relay
reliability and enhance relay availability.
This section introduces the SEL-421 and provides information on the
following topics:
➤ Features on page U.1.2
➤ Models and Options on page U.1.5
➤ Applications on page U.1.8
➤ Specifications on page 1.13
NOTE: Not all features mentioned on
this page are available in the SEL-421-1
and the SEL-421-2. See SEL-421
Versions and Supported Features on
page U.1.7 for more details about the
different versions of the relay and
about differences among the
SEL-421-0, SEL-421-1, SEL-421-2, and
SEL-421-3.
Courtesy of NationalSwitchgear.com