Sel 421 - Page 34

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SEL-421 Relay Date Code 20090715
Preface
Manual Overview
Section 3: PC Software. Explains how to use the ACSELERATOR
QuickSet
®
SEL-5030 software program.
Section 4: Basic Relay Operations. Describes how to perform fundamental
operations such as applying power and communicating with the relay,
setting and viewing passwords, checking relay status, viewing
metering data, reading event reports and SER (Sequential Events
Recorder) records, operating relay control outputs and control inputs,
and using relay features to make relay commissioning easier.
Section 5: Front-Panel Operations. Describes the LCD display messages
and menu screens; shows you how to use front-panel pushbuttons and
read targets; provides information about local substation control and
how to make relay settings via the front panel.
Section 6: Testing and Troubleshooting. Describes techniques for testing,
troubleshooting, and maintaining the SEL-421; includes the list of
status notification messages and a troubleshooting chart.
Appendix A: Firmware and Manual Versions. Lists the current firmware
versions and details differences between the current and previous
versions.
Applications
Handbook
Section 1: Protection Application Examples. Provides the following
protection schemes with explanations and settings:
➤ Overhead single 230 kV transmission line
➤ Overhead parallel 500 kV transmission lines with zero-
sequence mutual coupling
➤ Overhead tapped 345 kV transmission line
➤ Parallel 230 kV underground cables
This section also provides separate application examples for out-of-
step blocking and tripping, circuit breaker failure protection, and
automatic reclose and synchronism checking.
Section 2: Monitoring and Metering. Describes how to use the circuit
breaker monitors and the substation dc battery monitors; provides
information on viewing fundamental and rms metering quantities for
voltages and currents, as well as power and energy metering data.
Section 3: Analyzing Data. Explains how to obtain and interpret high-
resolution raw data oscillograms, filtered event reports, event
summaries, history reports, and SER reports; discusses how to enter
SER trigger and alias settings.
Section 4: Time-Synchronized Measurements. Explains synchronized
phasor measurements and estimation of power system states using the
SEL-421 high-accuracy time-stamping capability; presents real-time
load flow/power flow application ideas.
Section 5: Substation Automatic Restoration. Describes an example of
automatic substation restoration; gives a real-world example of the
programming ease and flexibility of free-form expanded SEL
OGIC
®
control equations.
Section 6: SEL Communications Processor Applications. Provides
examples of how to use the SEL-421 with the SEL-2032, SEL-2030,
and SEL-2020 Communications Processors for total substation
automation solutions.
Courtesy of NationalSwitchgear.com