A.3
Date Code 20171021 Instruction Manual SEL-421 Relay
Firmware, ICD File, and Manual Versions
Firmware
SEL-421-4-R322-V0-Z024013-D20170327
SEL-421-5-R322-V0-Z024013-D20170327
➤ Added an event report digital setting, ERDIG, which can be set to S
(some) or A (all) to allow the option for all Relay Word bits to be added
to COMTRADE event reports.
➤ Added the AUTO2 option to the directional control enable setting
(E32).
➤ Extended the resistance reach for Zones 4 and 5 of both the ground and
phase quadrilateral distance elements.
➤ Improved Simple Network Time Protocol (SNTP) accuracy to ± 1 ms in
an ideal network.
➤ Expanded the allowable reach for Zones 6 and 7 of the conventional out-
of-step logic.
20170327
➤ Added time-domain link (TiDL) technology.
➤ Added digital input and digital output Relay Word bits to accommodate
I/O from remote data acquisition modules.
➤ Added Zone 1 fault detector settings (Z50P1 and Z50G1) to phase- and
ground-distance elements.
➤ Modified alpha voltage (VALPHA) calculation to be forced to zero
when all poles are open.
➤ Enhanced frequency tracking to freeze for two cycles during toggling
open-pole conditions.
➤ Modified firmware to prevent delays in periodic MMS reports.
➤ Modified firmware to allow the MMS inactivity time-out to be turned
off.
➤ Enhanced the frequency tracking algorithm to update more responsively
after a low frequency event.
SEL-421-4-R321-V2-Z023013-D20171021
SEL-421-5-R321-V2-Z023013-D20171021
Includes all the functions of SEL-421-4-R321-V1-Z023013-D20170820
and SEL-421-5-R321-V1-Z023013-D20170820 with the following
addition:
➤ Enhanced memory read diagnostics.
20171021
SEL-421-4-R321-V1-Z023013-D20170820
SEL-421-5-R321-V1-Z023013-D20170820
Includes all the functions of SEL-421-4-R321-V0-Z023013-D20160624
and SEL-421-5-R321-V0-Z023013-D20160624 with the following
addition:
➤ Resolved an issue where certain Ethernet traffic could cause diagnostic
restarts.
20170820
SEL-421-4-R321-V0-Z023013-D20160624
SEL-421-5-R321-V0-Z023013-D20160624
➤ Added EVEMODn (where n = 1–6 for DNP LAN/WAN or empty for
DNP serial) setting to force the relay to start in single- or multiple-event
mode.
➤ Improved MIRRORED BITS performance under high level of GOOSE
traffic.
➤ Modified DNP Object 0, Variation 242 to report the firmware V-number.
➤ Modified GOOSE subscription to update data after the messages transi-
tion from bad to good quality.
➤ Improved relay start-up time.
➤ Modified Virtual Bits to reset upon a successful CID file download.
➤ Added support for IEEE 1588-2008, Precision Time Protocol (PTP)
time synchronization.
➤ Added ordering option to select Ethernet Ports 5A/5B if a customer
needs PTP.
➤ Added setting EPOLDIS to enable/disable the pole discrepancy breaker
status for the HMI Bay Control when the breaker type is set to single
pole. EPOLDIS = Y by default, which maintains the same behavior as
previous firmware.
20160624
Table A.1 Firmware Revision History (Sheet 2 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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