A.4
SEL-421 Relay Instruction Manual Date Code 20171021
Firmware, ICD File, and Manual Versions
Firmware
➤ Enhanced front panel operations to show settings warnings, in addition
to settings errors already displayed, during settings changes.
➤ Modified the handling of a leap year when the relay setting and clock
disagree.
SEL-421-4-R320-V2-Z022013-D20170820
SEL-421-5-R320-V2-Z022013-D20170820
Includes all the functions of SEL-421-4-R320-V1-Z022013-D20160504
and SEL-421-5-R320-V1-Z022013-D20160504 with the following
addition:
➤ Resolved an issue where certain Ethernet traffic could cause diagnostic
restarts.
20170820
SEL-421-4-R320-V1-Z022013-D20160504
SEL-421-5-R320-V1-Z022013-D20160504
Includes all the functions of SEL-421-4-R320-V0-Z022013-D20160111
and SEL-421-5-R320-V0-Z022013-D20160111 with the following addi-
tion:
➤ Modified programmable digital inputs to drop out at specified setting
threshold.
20160504
SEL-421-4-R320-V0-Z022013-D20160111
SEL-421-5-R320-V0-Z022013-D20160111
➤ Modified the TEST DB2 OFF command to disable the overridden
remote analog output and digital values in IEC 61850 GOOSE mes-
sages.
➤ Modified the TEST DB2 functionality to override Relay Word bits that
are in the Sequential Events Recorder (SER).
➤ Added two new breaker failure settings options, Y1 and Y2.
➤ Added additional synchronism-check schemes and a synchronous volt-
age difference setting, 25VDIF.
➤ Enhanced positive-sequence directional element (F32P) for high-resis-
tance faults.
20160111
SEL-421-4-R319-V2-Z021013-D20170820
SEL-421-5-R319-V2-Z021013-D20170820
Includes all the functions of SEL-421-4-R319-V1-Z021013-D20160506
and SEL-421-5-R319-V1-Z021013-D20160506 with the following
addition:
➤ Resolved an issue where certain Ethernet traffic could cause diagnostic
restarts.
20170820
SEL-421-4-R319-V1-Z021013-D20160506
SEL-421-5-R319-V1-Z021013-D20160506
Includes all the functions of SEL-421-4-R319-V0-Z021013-D20150504
and SEL-421-5-R319-V0-Z021013-D20150504 with the following addi-
tion:
➤ Modified programmable digital inputs to drop out at specified setting
threshold.
20160506
SEL-421-4-R319-V0-Z021013-D20150504
SEL-421-5-R319-V0-Z021013-D20150504
➤ Enhanced the out-of-step blocking logic to be more dependable during
single-pole open conditions.
➤ Added supervision to the quadrilateral phase and ground-distance ele-
ments for unusual unbalanced load conditions.
➤ Modified code to maintain VMEMC setting value during an upgrade.
➤ Added polarization voltage validation check to supervise quadrilateral
phase-distance elements
➤ Added the option to change settings groups with IEC 61850.
➤ Added the LPHD.Sim logical node so the relay will accept GOOSE
messages with the test flag asserted.
➤ Added Relay Word bits to indicate leading and lagging power factor.
➤ Added support for the stSeld attribute in IEC 61850 SBO controls.
➤ Added total energy analog quantities to the DNP3 analog input refer-
ence map, and added the imported and exported energy scaled and
labeled to KW to the binary counter reference data map.
20150504
Table A.1 Firmware Revision History (Sheet 3 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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