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Date Code 20171021 Instruction Manual SEL-421 Relay
Preface
Manual Overview
Section 6: Autoreclosing
. Explains how to operate the SEL-400 series relay
two-circuit breaker multishot recloser. Describes how to set the relay for
single-pole reclosing, three-pole reclosing, or both. Shows selection of
the lead and follow circuit breakers.
Section 7: Metering
. Provides information on viewing current, voltage, power,
and energy quantities. Describes how to view other common internal
operating quantities.
Section 8: Monitoring
. Describes how to use the circuit breaker monitors and
the substation dc battery monitors.
Section 9: Reporting
. 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 settings.
Section 10: Testing, Troubleshooting, and Maintenance
. Describes techniques for
testing, troubleshooting, and maintaining the relay. Includes the list of
status notification messages and a troubleshooting chart.
Section 11: Time and Date Management
. Explains time keeping principles, syn-
chronized phasor measurements, and estimation of power system states
using the high-accuracy time-stamping capability. Presents real-time load
flow/power flow application ideas.
Section 12: Settings
. Provides a list of all common SEL-400 series relay set-
tings and defaults.
Section 13: SELOGIC Control Equation Programming
. Describes multiple setting
groups and SEL
OGIC control equations and how to apply these equations.
Discusses expanded SEL
OGIC control equation features such as PLC-
style commands, math functions, counters, and conditioning timers. Pro-
vides a tutorial for converting older format SEL
OGIC control equations to
new freeform equations.
Section 14: ASCII Command Reference
. Provides an alphabetical listing of all
ASCII commands with examples for each ASCII command option.
Section 15: Communications Interfaces
. Explains the physical connection of
the relay to various communications network topologies. Describes the
various software protocols and how to apply these protocols to substation
integration and automation. Includes details about Ethernet IP protocols,
SEL ASCII, SEL Compressed ASCII, SEL Fast Meter, SEL Fast Operate,
SEL Fast SER, and enhanced M
IRRORED BITS communications.
Section 16: DNP3 Communication
. Describes the DNP3 communications proto-
col and how to apply this protocol to substation integration and automa-
tion. Provides a Job Done example for implementing DNP3 in a
substation.
Section 17: IEC 61850 Communication
. Describes the IEC 61850 protocol and
how to apply this protocol to substation automation and integration.
Includes IEC 61850 protocol compliance statements.
Section 18: Synchrophasors
. Describes the Phasor Measurement Unit (PMU)
functions of the relay. Provides details on synchrophasor measurement
and real-time control. Describes the IEEE C37.118 synchrophasor proto-
col settings. Describes the SEL Fast Message synchrophasor protocol set-
tings.
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