A.7
Date Code 20171021 Instruction Manual SEL-421 Relay
Firmware, ICD File, and Manual Versions
Firmware
SEL-421-4-R313-V0-Z017013-D20121214
SEL-421-5-R313-V0-Z017013-D20121214
➤ Added support for MMS authentication.
➤ Added MMS file transfer.
➤ Reduced the normal time constant of the distance element polarizing
voltage memory to more closely follow changes in power system fre-
quency; the time constant automatically adapts to provide security for
zero-voltage three-phase faults.
➤ Increased number of buffered and unbuffered reports to seven for MMS
reporting.
➤ Added max/min voltage quantities to the 27/59 operate quantity list.
➤ Added Parallel Redundancy Protocol (PRP).
➤ Increased the number of Goose subscriptions to 128.
20121214
➤ Increased the number of binary outputs to 100 for DNP map.
➤ Changed A/D offset failures to warnings.
➤ Added setting to three-pole recloser initiate logic instead of hard coded
15 cycles.
➤ Added ALTI and ALTV indication to SER report.
➤ Added rate-of-change of frequency (DFDTP) analog value.
➤ Added the high-speed directional elements to supervise pilot tripping
elements.
➤ Made mho calculation analogs available to the Event Report.
➤ Enhanced the fault identification logic to be secure during weak infeed
conditions.
➤ Implemented multiple updates to the DNP3 control point operation.
SEL-421-4-R312-V0-Z016013-D20120919
SEL-421-5-R312-V0-Z016013-D20120919
➤ Changed the default Group Setting ARESE from Y to N. 20120919
SEL-421-4-R311-V0-Z016013-D20120827
SEL-421-5-R311-V0-Z016013-D20120827
➤ Added security to the ground quadrilateral element’s adaptive resistance
blinder.
20120827
SEL-421-4-R310-V0-Z016013-D20120223
SEL-421-5-R310-V0-Z016013-D20120223
➤ Added bay control screen panning feature.
➤ Expanded bay control power system symbols.
➤ Added user-selectable analog and digital quantities to synchrophasor
data.
➤ Increased synchrophasor message capability from 1 to 5 unique data
sets.
➤ Added third pass-band filter to synchrophasor filter selections.
➤ Added test-mode status indication to synchrophasor data.
➤ Added local time displayed with reference to UTC time.
➤ Added simple network time protocol (SNTP) to relays equipped with
Ethernet.
20120223
Table A.1 Firmware Revision History (Sheet 6 of 7)
Firmware Identification (FID) Number Summary of Revisions
Manual
Date Code
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