A.6
SEL-421 Relay Instruction Manual Date Code 20171021
Firmware, ICD File, and Manual Versions
Firmware
➤ Enhanced performance to ensure that the relay does not become unre-
sponsive when M
IRRORED BITS communications is used on the front
port. In previous firmware, the relay could become unresponsive on rare
occasions if the front port is set to M
IRRORED BITS communications
protocol.
➤ Changed the minimum increment value of the Pickup and Dropout
Delay of the Main Board and Interface Board Control Inputs settings
(INxxxPU and INxxxDO) from 0.0625 cycles to 0.0001 cycles.
➤ Improved Close Immobility dropoff to be 60 cycles.
SEL-421-4-R318-V0-Z020013-D20150504
SEL-421-5-R318-V0-Z020013-D20150504
Note: This firmware did not production release. —
SEL-421-4-R317-V1-Z020013-D20170820
SEL-421-5-R317-V1-Z020013-D20170820
Includes all the functions of SEL-421-4-R317-V0-Z020013-D20131231
and SEL-421-5-R317-V0-Z020013-D20131231 with the following
addition:
➤ Resolved an issue where certain Ethernet traffic could cause diagnostic
restarts.
20170820
SEL-421-4-R317-V0-Z020013-D20131231
SEL-421-5-R317-V0-Z020013-D20131231
➤ Updated new bay screens to allow longer name lengths.
➤ Modified how 10-cycle analog quantities are initialized.
➤ Added setting EFID to enable/disable Fault Identification Logic.
➤ Added MIRRORED BITS Group Protocol Setting (MBG).
➤ Added extra directional supervision to High Speed Quadrilateral
Ground- and Phase-Distance elements. This enhancement applies to the
SEL-421-5 Relay only.
20131231
SEL-421-4-R316-V0-Z019013-D20130627
SEL-421-5-R316-V0-Z019013-D20130627
➤ Increased the pickup timer for the dSCV1_S comparison logic in the
relay three-phase fault detector (DTF logic) to 20 cycles to ensure
proper operation during very slow power swings.
➤ Added a VMEMC setting that selects between short or medium length
memory voltage as the polarizing quantity in distance calculations. The
relay uses the medium length memory when ESERCMP = Y to ensure
proper operation during voltage inversions. This addresses an issue with
revisions R313–R315 for system faults that cause voltage inversions on
series-compensated lines.
➤ Provided additional current and voltage quantities to the list of analog
quantities.
➤ Closed an outgoing UDP port that was reported as open by a port scan-
ner when IEC 61850 was enabled.
➤ Corrected handling of unrecognized Ethertypes that can cause Ethernet
ports to stop responding.
20130627
SEL-421-4-R315-V0-Z018013-D20130522
SEL-421-5-R315-V0-Z018013-D20130522
Note: This firmware did not production release. 20130522
SEL-421-4-R314-V0-Z017013-D20130222
SEL-421-5-R314-V0-Z017013-D20130222
➤ Corrected breaker inactivity time measurement in the circuit breaker
report.
➤ Changed the 81UVSP default setting from 56 V to 85 V.
➤ Improved Read/Write resources to avoid communications interruptions.
➤ Improved firmware revision upgrade algorithm to avoid loss of relay
settings during firmware revision upgrades.
➤ Improved memory usage by eliminating chattering binary GOOSE data.
➤ Improved diagnostic record management to avoid erroneous warnings
following a firmware upgrade.
20130222
Table A.1 Firmware Revision History (Sheet 5 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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