Sel SEL-421 - Page 41

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Date Code 20020501 SEL-421/SEL-421-1 Relay
Preface
Appendix A: Firmware 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 submarine 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 Relay 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-2030 Applications. provides examples of how to use the
SEL-421 Relay with the SEL-2020 and SEL-2030 Communications
Processors for total substation automation solutions.
Section 7: Direct Network Communication. explains how to use DNP 3.0
and the Ethernet protocols such as Telnet, FTP, and UCA2.
Reference Manual
Section 1: Protection Functions. describes the function of various relay
protection 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.
Section 2: Auto-Reclose and Synchronism Check. explains how to operate
the SEL-421 Relay two-circuit breaker multi-shot recloser; describes
how to set the SEL-421 Relay for single-pole reclosing, three-pole
reclosing, or both; shows selection of the lead and follow circuit
breakers; explains how to set and apply synchronism-check elements
for automatic and manual closing.
Section 3: SELOGIC
®
Control Equation Programming. describes SELOGIC
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;
provides a tutorial for converting older format SEL
OGIC control
equations to new free-form equations.