xx
SEL-421 Relay Instruction Manual Date Code 20171021
Preface
Manual Overview
Section 5: Protection Functions
. Describes the function of various relay pro-
tection elements. Describes how the relay processes these elements. Gives
detailed specifics on protection scheme logic for POTT, DCB, DCUB,
and DTT. Provides trip logic diagrams, and current and voltage source
selection details. Also describes basic 87L communications channel
options and configuration parameters.
Section 6: Protection Applications Examples
. Provides examples of configur-
ing the SEL-421 for some common applications.
Section 7: Metering, Monitoring, and Reporting
. Describes SEL-421-specific
metering, monitoring, and reporting features.
Section 8: Settings
. Provides a list of all relay settings and defaults. The set-
tings list is organized in the same order as in the relay and in the
ACSEL-
ERATOR QuickSet software.
Section 9: ASCII Command Reference
. Provides an alphabetical listing of all
ASCII commands with examples for each ASCII command option.
Section 10: Communications Interfaces
. Describes the SEL-421-specific com-
munications characteristics.
Section 11: Relay Word Bits
. Contains a summary of Relay Word bits.
Section 12: Analog Quantities
. Contains a summary of analog quantities.
Appendix A: Firmware, ICD File, and Manual Versions
. Lists the current firmware
and manual versions and details differences between the current and pre-
vious versions.
Appendix B: Converting Settings From SEL-421-0, -1, -2, -3 to SEL-421-4, -5
.
Describes differences in settings, Relay Word bits, analog quantities, and
DNP3 mapping between these versions of the relay.
SEL-400 Series Relays Instruction Manual
Preface.
Describes manual organization and conventions used to present
information, as well as safety information.
Section 1: Introduction
. Introduces SEL-400 series relay common features.
Section 2: PC Software
. Explains how to use ACSELERATOR QuickSet
SEL-5030 Software.
Section 3: Basic Relay Operations
. Describes how to perform fundamental
operations such as applying power and communicating with the relay, set-
ting 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 4: 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 5: Control
. Describes various control features of the relay, including
circuit breaker operation, disconnect operation, remote bits, and one-line
diagrams.
To Next Page
Loading...
